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{
"id": 1,
"topic": "gcn.circular",
"uuid": "025112ec-3f89-43bb-b257-72a036144315",
"title": "LIGO/Virgo S230518h: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/18 18:28:23 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33817",
"subject": "LIGO/Virgo S230518h: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230518h errorbox 192 sec after notice time and 10188 sec after trigger time at 2023-05-18 15:48:56 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 83 deg. The sun altitude is -20.3 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230518h errorbox 3191 sec after notice time and 13187 sec after trigger time at 2023-05-18 16:38:55 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -11.0 deg.\n\nThe galactic latitude b = -11 deg., longitude l = 223 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011865\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 10278 | 2023-05-18 15:48:56 | MASTER-Amur | (23h 42m 34.05s , +27d 56m 23.2s) | C | 180 | 16.4 |\n 10486 | 2023-05-18 15:52:23 | MASTER-Amur | (23h 36m 00.68s , +26d 00m 33.9s) | C | 180 | 16.5 |\n 10686 | 2023-05-18 15:55:44 | MASTER-Amur | (23h 56m 30.29s , +27d 55m 52.4s) | C | 180 | 15.6 |\n 11213 | 2023-05-18 16:04:31 | MASTER-Amur | (00h 13m 40.72s , +29d 50m 21.9s) | C | 180 | 15.3 |\n 11413 | 2023-05-18 16:07:51 | MASTER-Amur | (23h 55m 58.92s , +31d 42m 40.7s) | C | 180 | 17.0 |\n 11647 | 2023-05-18 16:11:44 | MASTER-Amur | (00h 05m 25.45s , +31d 43m 52.8s) | C | 180 | 16.6 |\n 12170 | 2023-05-18 16:20:28 | MASTER-Amur | (23h 56m 00.17s , +31d 44m 12.4s) | C | 180 | 16.8 |\n 12370 | 2023-05-18 16:23:48 | MASTER-Amur | (00h 05m 18.97s , +31d 43m 14.6s) | C | 180 | 16.9 |\n 12571 | 2023-05-18 16:27:08 | MASTER-Amur | (23h 25m 22.89s , +27d 54m 58.8s) | C | 180 | 17.5 |\n 12770 | 2023-05-18 16:30:28 | MASTER-Amur | (23h 34m 20.58s , +27d 54m 00.4s) | C | 180 | 17.3 |\n 12970 | 2023-05-18 16:33:47 | MASTER-Amur | (23h 18m 57.17s , +26d 01m 19.5s) | C | 180 | 17.5 |\n 13170 | 2023-05-18 16:37:07 | MASTER-Amur | (23h 27m 50.84s , +25d 59m 52.3s) | C | 180 | 17.4 |\n 13278 | 2023-05-18 16:38:55 | MASTER-SAAO | (06h 32m 29.44s , -23d 26m 27.9s) | C | 180 | 17.3 |\n 13278 | 2023-05-18 16:38:55 | MASTER-SAAO | (06h 33m 19.54s , -23d 26m 52.9s) | C | 180 | 17.4 |\n 13370 | 2023-05-18 16:40:27 | MASTER-Amur | (23h 25m 21.09s , +27d 55m 38.3s) | C | 180 | 17.5 |\n 13489 | 2023-05-18 16:42:27 | MASTER-SAAO | (06h 41m 06.20s , -23d 27m 07.7s) | C | 180 | 15.8 |\n 13489 | 2023-05-18 16:42:27 | MASTER-SAAO | (06h 41m 56.73s , -23d 27m 32.5s) | C | 180 | 15.7 |\n 13569 | 2023-05-18 16:43:47 | MASTER-Amur | (23h 34m 18.00s , +27d 54m 49.9s) | C | 180 | 17.5 |\n 13689 | 2023-05-18 16:45:47 | MASTER-SAAO | (06h 26m 56.44s , -21d 32m 00.9s) | C | 180 | 15.9 |\n 13689 | 2023-05-18 16:45:47 | MASTER-SAAO | (06h 27m 46.21s , -21d 32m 26.0s) | C | 180 | 15.9 |\n 13769 | 2023-05-18 16:47:06 | MASTER-Amur | (23h 18m 51.54s , +26d 01m 33.5s) | C | 180 | 17.7 |\n 13901 | 2023-05-18 16:49:18 | MASTER-SAAO | (06h 35m 40.83s , -21d 32m 55.8s) | C | 180 | 17.7 |\n 13901 | 2023-05-18 16:49:18 | MASTER-SAAO | (06h 36m 30.85s , -21d 33m 20.5s) | C | 180 | 17.7 |\n 13968 | 2023-05-18 16:50:26 | MASTER-Amur | (23h 27m 53.06s , +26d 00m 39.5s) | C | 180 | 17.6 |\n 14112 | 2023-05-18 16:52:49 | MASTER-SAAO | (06h 22m 09.91s , -19d 39m 15.3s) | C | 180 | 15.3 |\n 14112 | 2023-05-18 16:52:49 | MASTER-SAAO | (06h 22m 59.36s , -19d 39m 40.9s) | C | 180 | 15.4 |\n 14168 | 2023-05-18 16:53:46 | MASTER-Amur | (23h 26m 09.80s , +20d 17m 47.3s) | C | 180 | 17.5 |\n 14569 | 2023-05-18 17:00:26 | MASTER-Amur | (23h 27m 45.99s , +22d 13m 09.2s) | C | 180 | 17.4 |\n 14769 | 2023-05-18 17:03:46 | MASTER-Amur | (23h 36m 17.86s , +22d 12m 37.0s) | C | 180 | 17.4 |\n 14969 | 2023-05-18 17:07:06 | MASTER-Amur | (23h 26m 03.47s , +20d 19m 20.5s) | C | 180 | 17.4 |\n 15391 | 2023-05-18 17:14:09 | MASTER-Amur | (23h 27m 38.02s , +22d 11m 11.9s) | C | 180 | 17.5 |\n 15591 | 2023-05-18 17:17:28 | MASTER-Amur | (23h 36m 21.64s , +22d 11m 45.9s) | C | 180 | 17.4 |\n 15791 | 2023-05-18 17:20:48 | MASTER-Amur | (23h 30m 53.60s , +24d 05m 24.2s) | C | 180 | 17.6 |\n 15991 | 2023-05-18 17:24:08 | MASTER-Amur | (23h 39m 42.89s , +24d 07m 13.7s) | C | 180 | 17.6 |\n 16190 | 2023-05-18 17:27:28 | MASTER-Amur | (00h 13m 23.27s , +27d 55m 46.2s) | C | 180 | 17.0 |\n 16390 | 2023-05-18 17:30:47 | MASTER-Amur | (00h 22m 34.20s , +27d 54m 50.2s) | C | 180 | 16.8 |\n 16789 | 2023-05-18 17:37:26 | MASTER-Amur | (00h 04m 00.08s , +27d 48m 45.4s) | C | 180 | 16.8 |\n 16989 | 2023-05-18 17:40:46 | MASTER-Amur | (00h 03m 57.56s , +27d 50m 06.1s) | C | 180 | 16.8 |\n 17189 | 2023-05-18 17:44:06 | MASTER-Amur | (00h 03m 57.25s , +27d 48m 30.8s) | C | 180 | 16.7 |\n 17875 | 2023-05-18 17:55:33 | MASTER-Amur | (23h 30m 51.84s , +24d 05m 05.7s) | C | 180 | 16.9 |\n 18075 | 2023-05-18 17:58:52 | MASTER-Amur | (23h 39m 33.41s , +24d 04m 17.8s) | C | 180 | 16.6 |\n 18280 | 2023-05-18 18:02:18 | MASTER-Amur | (00h 13m 26.48s , +27d 53m 29.6s) | C | 180 | 15.9 |\n 18480 | 2023-05-18 18:05:37 | MASTER-Amur | (00h 22m 26.18s , +27d 54m 42.7s) | C | 180 | 15.8 |\n 18679 | 2023-05-18 18:08:57 | MASTER-Amur | (23h 55m 59.05s , +29d 47m 58.1s) | C | 180 | 16.0 |\n 18879 | 2023-05-18 18:12:17 | MASTER-Amur | (00h 05m 53.80s , +29d 47m 33.9s) | C | 180 | 15.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-18T18:28:33.247908Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T18:28:33.247934Z",
"modified": "2023-05-18T18:28:33.252792Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 3,
"topic": "gcn.circular",
"uuid": "7752b1e5-5c0c-4f0b-93c3-bd7d76d76356",
"title": "LIGO/Virgo/KAGRA S230518h: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/05/18 20:36:37 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "33818",
"subject": "LIGO/Virgo/KAGRA S230518h: Upper limits from Fermi-GBM Observations"
},
"message_text": "S. Dalessi (UAH) and C. Fletcher (USRA) report on behalf of the\nFermi-GBM Team and the GBM-LIGO/Virgo/KAGRA group\n\nFor S230518h and using the updated Bilby skymap (GCN 33816), Fermi-GBM\nwas observing 48.9% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the\nLIGO/Virgo/KAGRA (LVK) detection of GW trigger S230518h (GCN 33813).\nAn automated, blind search for short gamma-ray bursts below the\nonboard triggering threshold in Fermi-GBM also identified no\ncounterpart candidates. The GBM targeted search, the most sensitive,\ncoherent search for GRB-like signals, was run from +/-30 s around\nmerger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi,\nlocated at an RA2.3, Dec=-3.6 with a radius of 67.6 degrees. We\ntherefore set upper limits on impulsive gamma-ray emission for the LVK\nConsortia localization region visible to Fermi at merger time. Using\nthe representative soft, normal, and hard GRB-like templates described\nin arXiv:1612.02395, we set the following 3 sigma flux upper limits\nover 10-1000 keV, weighted by GW localization probability (in units of\n10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 1.4 2.7 6.1\n1.024 s: 0.4 0.8 2.0\n8.192 s: 0.1 0.3 0.8\n\nAssuming the median luminosity distance of 277.9 Mpc from the GW\ndetection, we estimate the following intrinsic luminosity upper limits\nover the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.020 0.035 0.132\n1.024s: 0.006 0.010 0.043\n8.192s: 0.002 0.004 0.018\n\n",
"published": "2023-05-18T20:36:57.345359Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T20:36:57.345376Z",
"modified": "2023-05-18T20:36:57.351013Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 4,
"topic": "gcn.circular",
"uuid": "49515ae5-9f49-46c3-a249-6a30131e357d",
"title": "LIGO/Virgo/KAGRA S230518h: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/05/18 20:42:47 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33819",
"subject": "LIGO/Virgo/KAGRA S230518h: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), M. Dixit (IITB), A. Ahmad (IITB), D. Bhattacharya (IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried out a search for X-ray candidates in AstroSat CZTI data in a 1000-sec window centered on the trigger time of the NSBH merger event candidate S230518h (UTC 2023-05-18 12:59:08, GCN Circular 33813). We use the Bilby.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230518h/files/Bilby.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a considerable effective area for about 29% of the entire sky and is also sensitive to brighter transients from the entire sky. At the time of the merger, AstroSat's nominal pointing is RA, DEC = 12:37:01.5, 14:12:34.4 (189.2562,14.2096), which is ~96 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~43 deg and hence is occulted by Earth in the satellite's frame. The region of the localization map which is not occulted by Earth in the satellite's frame has a total probability of 0.26 (26%).\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants to look for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 1000 sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modeled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability-weighted mean over the visible sky:\n\n0.1 s: flux limit= 2.01e-05 ergs/cm^2/s; fluence limit = 2.01e-06 ergs/cm^2\n1.0 s: flux limit= 7.30e-06 ergs/cm^2/s; fluence limit = 7.30e-06 ergs/cm^2\n10.0 s: flux limit= 8.25e-07 ergs/cm^2/s; fluence limit = 8.25e-06 ergs/cm^2\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\n",
"published": "2023-05-18T20:42:56.901117Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T20:42:56.901135Z",
"modified": "2023-05-18T20:42:56.907655Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 5,
"topic": "gcn.circular",
"uuid": "357b32eb-66c1-456f-a2b3-3563082d5c16",
"title": "LIGO/Virgo/Kagra S230518h: NED Galaxies in the Localization Volume",
"submitter": "Hop gcn.circular",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
"date": "23/05/18 21:55:55 GMT",
"from": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"title": "GCN CIRCULAR",
"number": "33820",
"subject": "LIGO/Virgo/Kagra S230518h: NED Galaxies in the Localization Volume"
},
"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\n\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S230518h-3-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023 submitted), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 6336 galaxies within the 90% containment volume, and we list here the top 20 galaxies located in the 90% volume sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full list of galaxies in the 90% volume go to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/.\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic followup observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D*P_SFR; and specific star formation rate, P_3D*P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\n Galaxy RA Dec Distance m_NUV mErr_NUV m_Ks mErr_Ks m_W1 mErr_W1 P_3D P_3D_LumW1\n (Deg) (Deg) (Mpc) (AB) (mag) (Vega) (mag) (Vega) (mag) (Prob) (Prob)\n------------------------- ---------- ---------- ------- ----- --------- ----- -------- ----- -------- -------- ----------\nWISEA J061043.04-023625.2 92.679167 -2.606972 330.48 -- -- 13.61 0.18 9.21 0.01 8.92e-01 2.03e-03\nWISEA J055357.30-060207.5 88.488792 -6.036111 224.38 -- -- 13.16 0.22 8.50 0.01 8.37e-01 1.79e-03\nWISEA J071238.60-372350.1 108.161375 -37.397306 390.44 -- -- 13.39 0.19 9.73 0.01 7.31e-01 1.46e-03\nWISEA J073438.51-432253.0 113.660542 -43.381306 383.92 -- -- 13.68 0.22 9.90 0.01 8.82e-01 1.43e-03\nWISEA J072905.20-623320.6 112.271625 -62.555722 393.80 -- -- 13.64 0.16 9.97 0.00 8.92e-01 1.40e-03\nWISEA J083134.97-803600.3 127.896000 -80.600111 379.45 -- -- 12.90 0.13 9.85 0.01 8.41e-01 1.34e-03\nWISEA J201533.66-842204.1 303.890667 -84.367722 311.23 -- -- 12.78 0.15 9.22 0.00 6.58e-01 1.28e-03\nWISEA J072738.54-425615.1 111.910625 -42.937667 413.61 -- -- 13.24 0.15 10.12 0.01 8.49e-01 1.28e-03\nWISEA J051736.04+131107.5 79.400292 13.185306 257.07 -- -- 12.35 0.10 8.88 0.01 6.50e-01 1.27e-03\nWISEA J070806.23-280528.7 107.025875 -28.091250 363.10 -- -- 12.97 0.12 9.83 0.01 8.36e-01 1.26e-03\nWISEA J071641.54-440551.7 109.173125 -44.097722 405.31 -- -- 13.57 0.19 10.10 0.01 8.38e-01 1.22e-03\nWISEA J071514.23-444325.0 108.809292 -44.723639 310.49 -- -- 13.22 0.21 9.57 0.01 8.01e-01 1.11e-03\nWISEA J070342.88-284717.5 105.928583 -28.788250 393.85 -- -- 13.08 0.12 10.03 0.01 7.57e-01 1.11e-03\nWISEA J071442.74-325953.2 108.678125 -32.998472 332.08 -- -- 13.13 0.22 9.73 0.01 7.63e-01 1.05e-03\nWISEA J072927.23-514825.9 112.363833 -51.807111 371.85 -- -- 13.15 0.12 10.17 0.01 8.31e-01 9.62e-04\nWISEA J063501.19-220426.1 98.754542 -22.073778 339.10 -- -- 13.60 0.21 9.97 0.01 7.93e-01 9.05e-04\nWISEA J074213.61-513130.2 115.556667 -51.524778 307.38 -- -- 12.67 0.06 9.86 0.01 8.44e-01 9.04e-04\nWISEA J073702.29-543332.7 114.259500 -54.559083 324.86 -- -- 12.06 0.13 9.82 0.00 7.43e-01 9.00e-04\nWISEA J071346.05-430854.4 108.441833 -43.148472 394.97 -- -- 13.68 0.21 10.54 0.01 8.70e-01 7.98e-04\nWISEA J070806.38-405759.9 107.027042 -40.967000 284.57 -- -- 13.79 0.14 9.81 0.01 8.35e-01 7.82e-04\n\nTable: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S230518h sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D*P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1).\n\n",
"published": "2023-05-18T21:56:04.482867Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T21:56:04.482886Z",
"modified": "2023-05-18T21:56:04.489174Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 6,
"topic": "gcn.circular",
"uuid": "f75c6890-ceef-4aad-8e19-4f463b9f82ab",
"title": "Fermi Gamma-ray Burst Monitor trigger 706068974/230518095 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"data": {
"date": "23/05/18 22:30:43 GMT",
"from": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33821",
"subject": "Fermi Gamma-ray Burst Monitor trigger 706068974/230518095 is not a GRB"
},
"message_text": "J. Wood (NASA/MSFC) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 706068974/230518095 at 02:16:09.41 UT\non 18 May 2023, tentatively classified as a GRB, is in fact not due\nto a GRB. This trigger is likely due to local particles.\"\n\n",
"published": "2023-05-18T22:30:52.886694Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T22:30:52.886713Z",
"modified": "2023-05-18T22:30:52.892382Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 7,
"topic": "gcn.circular",
"uuid": "a5874452-6f37-4f18-9964-7d428ffb6c13",
"title": "GRB 230518A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/18 22:59:56 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33822",
"subject": "GRB 230518A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 22:49:27 UT on 18 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230518A (trigger 706142972.60896 / 230518951).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 256.4, Dec = -49.6 (J2000 degrees, equivalent to J2000 17h 05m, -49d 36'), with a statistical uncertainty of 19.0 degrees.\n\nThe angle from the Fermi LAT boresight is 23.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230518951/quicklook/glg_skymap_all_bn230518951.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230518951/quicklook/glg_healpix_all_bn230518951.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230518951/quicklook/glg_lc_medres34_bn230518951.gif\n\n",
"published": "2023-05-18T23:00:06.518511Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-18T23:00:06.518526Z",
"modified": "2023-05-18T23:00:06.524582Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 438,
"topic": "gcn.circular",
"uuid": "78be82ce-bc27-4376-ac68-aaf5ea6f98d3",
"title": "LIGO/Virgo S230619bg: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/20 03:36:49 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34034",
"subject": "LIGO/Virgo S230619bg: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230619bg errorbox 12248 sec after notice time and 12323 sec after trigger time at 2023-06-20 03:06:30 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 35 deg. The sun altitude is -68.8 deg.\n\nThe galactic latitude b = 28 deg., longitude l = 173 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012172\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 12414 | 2023-06-20 03:06:30 | MASTER-OAFA | (15h 53m 47.82s , -65d 44m 33.5s) | C | 180 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3MjMyMjE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rpXiVpO4gTagEN_iNRY8dNeDcjDPMTod8gxrGjL4mi4\n\n",
"published": "2023-06-20T03:37:00.368766Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-20T03:37:00.368793Z",
"modified": "2023-06-20T03:37:00.374312Z",
"nonlocalizedevents": [
{
"event_id": "S230619b"
}
],
"targets": []
},
{
"id": 8,
"topic": "gcn.circular",
"uuid": "ac8eccff-1cb7-4967-8c81-eea623908a22",
"title": "LIGO/Virgo/KAGRA S230518h: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/05/19 09:51:52 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33823",
"subject": "LIGO/Virgo/KAGRA S230518h: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "M. Serino, S. Sugita (AGU),\nH. Negoro (Nihon U.),\nN. Kawai (RIKEN),\nM. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN),\nT. Sakamoto, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.),\nM. Shidatsu (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.),\nY. Kawakubo (LSU),\nM. Sugizaki (NAOC),\nW. Iwakiri (Chiba U.)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter the compact binary merger candidate S230518h at 2023-05-18 12:59:08.167 UTC (GCN 33813).\n\nAt the trigger time of S230518h, the high-voltage of MAXI/GSC was on,\nbut the FOV was out of the 90% credible region of the bayestar skymap.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 70%\nof the 90% credible region of the bayestar skymap from 13:24:45 to 14:16:55 UTC (T0+1537 to T0+4667 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n\n",
"published": "2023-05-19T09:52:01.853642Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T09:52:01.853661Z",
"modified": "2023-05-19T09:52:01.862152Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 9,
"topic": "gcn.circular",
"uuid": "f0271309-5891-4338-8a12-203a879e61bb",
"title": "LIGO/Virgo S230518h: Swift XRT observations, 8 X-ray sources",
"submitter": "Hop gcn.circular",
"authors": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"data": {
"date": "23/05/19 10:44:27 GMT",
"from": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33824",
"subject": "LIGO/Virgo S230518h: Swift XRT observations, 8 X-ray sources"
},
"message_text": "P.A. Evans (U. Leicester), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P.\nBeardmore (U. Leicester), M.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL),\nS. Campana (INAF-OAB), S.B. Cenko (NASA/GSFC), P. D'Avanzo (INAF-OAB), R.A.J.\nEyles-Ferris (U. Leicester), C. Gronwall (PSU), D. Hartmann (U. Clemson), N.J.\nKlingler (NASA/GSFC), N.P.M. Kuin (UCL-MSSL), A.Y. Lien (GSFC/UMBC), F.E.\nMarshall (NASA/GSFC), A. Melandri (INAF-OAB), J.A. Nousek (PSU), S.R. Oates (U.\nBirmingham), P.T. O'Brien (U. Leicester), J.P.Osborne (U. Leicster), K.L. Page\n(U.Leicester), M.J.Page (UCL-MSSL), B. Sbarufatti (INAF-OAB), M.H. Siegel (PSU),\nG. Tagliaferri (INAF-OAB), E. Troja (U Tor Vergata, INAF) report on behalf of\nthe Swift team:\n\nSwift has carried out 60 observations of the LVC error region for the GW trigger\nS230518h convolved with the 2MPZ catalogue (Bilicki et al. 2014, ApJS, 210, 9),\nusing the 'BAYESTAR' GW localisation map. As this is a 3D skymap, galaxy\ndistances were taken into account in selecting which ones to observe. The\nobservations currently span from 7.8 ks to 35 ks after the LVC trigger, and\nthe XRT has covered 6.0 deg^2 on the sky (corrected for overlaps). This covers\n1% of the probability in the 'ligo-skymap-from-samples' skymap, and 4.7% after\nconvolving with the 2MPZ galaxy catalogue, as described by Evans et al. (2016,\nMNRAS, 462, 1591). These pointings and associated metadata have been reported to\nthe Treasure Map.\n\nIn total, we have detected 8 X-ray sources. Each source is assigned a rank of\n1-4 which describes how likely it is to be related to the GW trigger, with 1\nbeing the most likely and 4 being the least likely. The ranks are described at\nhttps://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n * 0 sources of rank 1\n * 1 source of rank 2\n * 1 source of rank 3\n * 6 sources of rank 4\n\nThe 'rank 2' source was identified as such because it is uncatalogued in X-rays, and in\nthe initial analysis its flux was found to be significantly above the upper-limit from\nthe ROSAT All Sky Survey. However, this assumes a standard spectral model; using a model\nfitted to the data from source 2 for this conversion we find that the XRT observed flux\nis consistent with the ROSAT non-detection and so cannot be identified as a transient.\n\n\nDetails of all of the detected sources, by rank, are given below. All\ncoordinates are in J2000.\n\nRANK 2 sources\n=============\nThese are uncatalogued X-ray sources, which in the inital X-ray analysis had fluxes above the\nhistorical 3-sigma upper limits.\n\n| Source ID | RA | Dec | Err90 |\n| S230518h_X8 | 22h 19m 10.78s | -84d 49' 08.0\" | 7.8\" |\n\n\n\nRANK 3 sources\n=============\nThese are uncatalogued X-ray sources, however they are not brighter than\nprevious upper limits, so do not stand out as likely counterparts to the GW\ntrigger.\n\n| Source ID | RA | Dec | Err90 |\n| S230518h_X6 | 07h 46m 12.93s | -54d 02' 40.3\" | 7.8\" |\n\n\nRANK 4 sources\n=============\nThese are catalogued X-ray sources, showing no signs of outburst compared to\nprevious observations, so they are not likely to be related to the GW trigger.\n\n| Source ID | RA | Dec | Err90 |\n| S230518h_X1 | 20h 40m 07.33s | -71d 15' 02.7\" | 4.6\" |\n| S230518h_X2 | 20h 41m 59.36s | -73d 19' 09.5\" | 7.7\" |\n| S230518h_X3 | 20h 02m 16.15s | -83d 26' 41.9\" | 6.3\" |\n| S230518h_X4 | 07h 45m 07.88s | -54d 04' 50.7\" | 17.1\" |\n| S230518h_X5 | 07h 45m 09.54s | -54d 05' 45.3\" | 15.4\" |\n| S230518h_X7 | 07h 02m 12.02s | -86d 43' 48.3\" | 6.7\" |\n\nFor all flux conversions and comparisons with catalogues and upper limits from\nother missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2, and\nphoton index (Gamma)=1.7\n\nThe results of the XRT automated analysis, including details of the sources\nlisted above, are online at https://www.swift.ac.uk/LVC/S230518h\n\nThis circular is an official product of the Swift XRT team.\n\n\n",
"published": "2023-05-19T10:44:36.417489Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T10:44:36.417508Z",
"modified": "2023-05-19T10:44:36.424793Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 10,
"topic": "gcn.circular",
"uuid": "5eda7491-e95e-45f0-b2e9-01442a2dbcd4",
"title": "GRB 230518A: Swift/BAT-GUANO detection",
"submitter": "Hop gcn.circular",
"authors": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"data": {
"date": "23/05/19 11:34:53 GMT",
"from": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33825",
"subject": "GRB 230518A: Swift/BAT-GUANO detection"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 230518A onboard (T0: 2023-05-18T22:49:27.61 UTC, Fermi/GBM GCN 33822).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 11 in a 0.128 s analysis time bin.\nThe burst duration is ~0.256 seconds.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a borderline DeltaLLHOut of 6.5.\nThe majority of the Fermi/GBM localization lies outside the coded FOV.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n",
"published": "2023-05-19T11:35:02.912097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T11:35:02.912116Z",
"modified": "2023-05-19T11:35:02.919469Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 11,
"topic": "gcn.circular",
"uuid": "132bb2d6-4429-4086-b596-9f1b3685ab26",
"title": "LIGO/Virgo S230518h: AGILE/MCAL observations",
"submitter": "Hop gcn.circular",
"authors": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"data": {
"date": "23/05/19 11:54:04 GMT",
"from": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"title": "GCN CIRCULAR",
"number": "33826",
"subject": "LIGO/Virgo S230518h: AGILE/MCAL observations"
},
"message_text": "F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ.\nRoma Tor Vergata), A. Ursi (ASI), C. Pittori (SSDC, and INAF/OAR),\nM. Cardillo, C. Casentini, L. Foffano, G. Piano (INAF/IAPS), F.\nLucarelli (SSDC, and INAF/OAR), L. Baroncelli, A. Bulgarelli, A.\nCiabattoni, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani\n(INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ.\nTrieste, and INFN Trieste), report on behalf of the AGILE Team:\n\nIn response to the LIGO/Virgo GW event S230518h at T0 = 2023-05-18\n12:59:08.167 (UT), a preliminary analysis of the AGILE minicalorimeter\n(MCAL) triggered data found no significant event candidates within\na time interval covering -/+ 2 sec from the LIGO/Virgo T0.\n\nAt the T0, about 25% of the S230518h 90% c.l. localization region\n(LR) was accessible to the AGILE/MCAL.\n\nThree-sigma upper limits (ULs) are obtained in the 0.4-1 MeV energy\nrange, for a 1 s integration time at different celestial positions\nwithin the accessible S230518h LR, from a minimum of 1.4E-06 erg\ncm^-2 to a maximum of 6.6E-06 erg cm^-2 (assuming as spectral model\na single power-law with photon index 1.5).\n\nAn independent procedure based on photon counting statistics\nprovides UL fluences in the range 0.4-1 MeV, for a 300 microseconds\nintegration time, from a minimum of 1.1E-08 erg cm^-2 to a maximum\nof 4.4E-08 erg cm^-2.\n\nWe notice the detection of a short pulse in the energy range 0.4-1.4\nMeV with S/N 5.7 at time T0+10.77 s.\n\nThe AGILE/MCAL detector is a CsI detector with a 4 pi FoV, sensitive\nin the energy range 0.4-100 MeV. Additional analysis of AGILE data\nis in progress.\n\n",
"published": "2023-05-19T11:54:14.101041Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T11:54:14.101060Z",
"modified": "2023-05-19T11:54:14.106938Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 439,
"topic": "gcn.circular",
"uuid": "712a1f96-3856-452f-b854-6c40a167bdcb",
"title": "LIGO/Virgo S230620w: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/20 03:37:11 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34035",
"subject": "LIGO/Virgo S230620w: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230620w errorbox 46 sec after notice time and 289 sec after trigger time at 2023-06-20 03:19:33 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 52 deg. The sun altitude is -71.4 deg.\n\nThe galactic latitude b = -40 deg., longitude l = 335 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012182\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 320 | 2023-06-20 03:19:33 | MASTER-OAFA | (21h 02m 43.75s , -61d 03m 20.2s) | C | 60 | 16.3 |\n 416 | 2023-06-20 03:21:05 | MASTER-OAFA | (21h 02m 50.10s , -61d 02m 51.3s) | C | 70 | 16.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3MjMyMjMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zF5-g9T6yvXFJ6MMigCnJiIi_oKrTjwoEvvvfvlftRc\n\n",
"published": "2023-06-20T03:37:16.414328Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-20T03:37:16.414346Z",
"modified": "2023-06-20T03:37:16.419298Z",
"nonlocalizedevents": [
{
"event_id": "S230620w"
}
],
"targets": []
},
{
"id": 440,
"topic": "gcn.circular",
"uuid": "ad528b39-c75b-417d-9206-4b6505fc99a7",
"title": "LIGO/Virgo S230620z: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/20 03:37:22 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34036",
"subject": "LIGO/Virgo S230620z: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230620z errorbox 76 sec after trigger time at 2023-06-20 03:21:05 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 52 deg. The sun altitude is -71.7 deg.\n\nThe galactic latitude b = -71 deg., longitude l = 278 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012184\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 111 | 2023-06-20 03:21:05 | MASTER-OAFA | (21h 02m 50.10s , -61d 02m 51.3s) | C | 70 | 16.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3MjMyMjQ0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.rHnzOTx-3EXmvSg_Oc_yiX5fQfRLDFYIrDUU5KaS1ZI\n\n",
"published": "2023-06-20T03:37:26.450324Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-20T03:37:26.450342Z",
"modified": "2023-06-20T03:37:26.454786Z",
"nonlocalizedevents": [
{
"event_id": "S230620z"
}
],
"targets": []
},
{
"id": 12,
"topic": "gcn.circular",
"uuid": "e28b6057-e949-4947-8fd0-f8932a70b921",
"title": "LIGO/Virgo/KAGRA S230518h: Upper limits from Konus-Wind observations",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "23/05/19 16:11:50 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "33827",
"subject": "LIGO/Virgo/KAGRA S230518h: Upper limits from Konus-Wind observations"
},
"message_text": "A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nKonus-Wind (KW) was observing the whole sky at the time of the\nLIGO/Virgo/KAGRA event S230518h (2023-05-18 12:59:08.167 UTC, hereafter T0;\nLIGO/Virgo/KAGRA Collaboration GCN Circ. 33813, 33816).\n\nNo triggered or waiting-mode KW GRBs happened between ~10 hours\nbefore and ~2 hours after T0 (the current available data).\nUsing waiting-mode data within the interval T0 +/- 100 s,\nwe found no significant (> 5 sigma) excess over the background\nin both KW detectors on temporal scales from 2.944 s to 100 s.\n\nWe estimate an upper limit (90% conf.) on the 20 - 1500 keV fluence\nto 7.6x10^-7 erg/cm^2 for a burst lasting less than 2.944 s and having a\ntypical KW short GRB spectrum (an exponentially cut off power law (CPL)\nwith alpha =-0.5 and EpP0 keV) and to 4.0x10^-7 erg/cm^2 for a burst\nhaving spectrum similar to that of GRB 170817A (a CPL with alpha =-0.62\nand Ep\u00185 keV). For a typical long GRB spectrum (the Band function with\nalpha=-1, beta=-2.5, and Ep00 keV), the corresponding limiting peak flux\nis 2.3x10^-7 erg/cm^2/s (20 - 1500 keV, 2.944 s scale).\n\nAll the quoted values are preliminary.\n\n",
"published": "2023-05-19T16:12:02.709167Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T16:12:02.709187Z",
"modified": "2023-05-19T16:12:02.715703Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 13,
"topic": "gcn.circular",
"uuid": "b5760570-8cd5-40bd-aabb-3bd104aaa00d",
"title": "GRB 230518A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "23/05/19 17:07:45 GMT",
"from": "sumanbala2210@gmail.com",
"title": "GCN CIRCULAR",
"number": "33828",
"subject": "GRB 230518A: Fermi GBM Observation"
},
"message_text": "S. Bala (USRA), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 22:49:27.61 UT on 18 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230518A (trigger 706142972/230518951).\nwhich was also detected by Swift/BAT-GUANO (S. Ronchini et al. 2023, GCN\n33825).\nThe Fermi GBM Final Real-time Localization was reported in GCN 33822.\n\nThe angle from the Fermi LAT boresight is 23 degrees.\n\nThe GBM light curve consists of one short peak with a duration (T90)\nof about 0.9 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.7 to T0+0.2 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is 0.6 +/- 0.7 and the cutoff energy,\nparameterized as Epeak, is 503 +/- 138 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.5 +/- 0.9)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.0 s in the 10-1000 keV band is 4 +/- 1 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n",
"published": "2023-05-19T17:07:55.976710Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T17:07:55.976751Z",
"modified": "2023-05-19T17:07:55.983671Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 14,
"topic": "gcn.circular",
"uuid": "51b77280-a324-4382-9b2c-239fe16ddce3",
"title": "LIGO/Virgo/KAGRA S230518h: Swope Search and Candidate Counterpart Identification",
"submitter": "Hop gcn.circular",
"authors": "David Coulter at UCSC <dcoulter@ucsc.edu>",
"data": {
"date": "23/05/19 17:08:20 GMT",
"from": "David Coulter at UCSC <dcoulter@ucsc.edu>",
"title": "GCN CIRCULAR",
"number": "33829",
"subject": "LIGO/Virgo/KAGRA S230518h: Swope Search and Candidate Counterpart Identification"
},
"message_text": "D. A. Coulter (UCSC), C. D. Kilpatrick (Northwestern), C. Rojas-Bravo (UCSC), R. J. Foley (UCSC), Y. Kong (LCO), B. OâConnor (GWU), A. L. Piro (Carnegie), and A. Rest (STScI), report on behalf of the 1M2H collaboration:\n\nWe conducted an optical search for candidate counterparts in the localization region of LVK gravitational wave event S230518h (GCN 33813) with the Swope 1-m telescope using the 29.8â x 29.7â field-of-view Direct camera. The tiling was optimally determined using the latest localization map from the LVK and galaxy catalogs in Teglon (Coulter et al., in prep). In total, Swope observed 9 fields within the 90th percentile localization region of S230518h at:\n\nMJD RA Dec Band Exptime Maglim(AB)\n60082.97419 07:22:15.898 -49:05:26.261 i 300.000 21.7621\n60082.98236 07:20:39.617 -84:47:34.465 i 285.000 21.3325\n60082.98727 07:20:03.166 -85:47:04.692 i 300.000 21.3605\n60082.99201 07:23:52.430 -84:17:49.351 i 285.000 21.5397\n60082.99720 07:42:22.186 -54:32:42.515 i 300.000 21.8507\n60083.00245 07:43:16.761 -70:24:46.161 i 300.000 21.1865\n60083.00728 07:50:34.461 -67:26:15.477 i 285.000 21.3315\n60083.01301 07:53:15.693 -75:52:02.414 i 315.000 21.1845\n60083.01791 07:54:53.802 -78:50:33.098 i 330.000 20.4372\n\nThese observations have been reported to the TreasureMap (Wyatt et al., 2020).\n\nSubtracting DECam and SkyMapper template images from the Swope images using photpipe (Rest et al., 2005), we identified the following candidate counterparts in our imaging:\n\nName MJD RA(deg) Dec(deg) Filter Mag Magerr 2D_Percentile\nSSS23a 60082.98236 108.74882083333331 -84.62690277777777 i 20.9 0.2 0.2479\nSSS23b 60082.98727 112.276725 -85.9142638888889 i 21.1 0.2 0.2435\nSSS23c 60083.01791 117.93889999999998 -78.77603055555555 i 20.1 0.2 0.1924\n\nWe have checked the Minor Planet Center and Transient Name Server, finding no previously reported solar system object or transient. We encourage follow-up observations of these sources.\n\n",
"published": "2023-05-19T17:08:24.025147Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T17:08:24.025164Z",
"modified": "2023-05-19T17:08:24.030858Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 15,
"topic": "gcn.circular",
"uuid": "22a96167-13b6-4eb5-9815-b208956f074b",
"title": "LIGO/Virgo/KAGRA S230518h: ATLAS observations of the skymap",
"submitter": "Hop gcn.circular",
"authors": "Michael Fulton at Queen's U, Belfast <mfulton07@qub.ac.uk>",
"data": {
"date": "23/05/19 18:09:18 GMT",
"from": "Michael Fulton at Queen's U, Belfast <mfulton07@qub.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33830",
"subject": "LIGO/Virgo/KAGRA S230518h: ATLAS observations of the skymap"
},
"message_text": "M. D. Fulton, M. Nicholl, K. W. Smith, S. Srivastav, D. R. Young, M. McCollum, T. Moore, S. Sim, J. Weston, X. Sheng (QUB), L. Shingles (GSI/QUB), J. Sommer (LMU/QUB), A. Aamer (UoB/QUB), S. J. Smartt, H. Stevance, L. Rhodes, A. Andersson (Oxford), L. Denneau, J. Tonry, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), J. Anderson (ESO), A. Jordan, V. Suc (UAI, Obstech) A. Rest (STScI), T.-W. Chen (TUM), C. Stubbs (Harvard):\n\nWe report observations of the bilby.multiorder.fits updated skymap of the NSBH event S230518h (The LIGO-Virgo-Kagra Collaboration, GCN 33816) with the ATLAS telescope system (Tonry et al., 2018, PASP, 13, 164505). ATLAS is a quadruple 0.5m optical telescope survey system (Hawaii, South Africa, Chile) employing two filters, cyan and orange. In our primary NASA mission for Near-Earth Object discovery, we cover the entire visible night sky every 24hrs to mag~19.5, weather permitting.\n\nDuring normal science operations, we covered part of the accessible skymap of S230518h. A sequence of quads (4 x 30-sec images) was taken at each pointing position. The images were processed with the ATLAS pipeline, and reference images were subtracted from each one. Transient candidates were identified and run through our standard filtering procedures (Smith et al., 2020, PASP, 132, 1). We covered 175 square degrees of the bilby.fits skymap 90% area, and covered a sky region totalling 30% of the event's full localisation likelihood South of declination =-42 degrees. Data acquisition began at MJD 60082.95977 or 2023-05-18 23:02:04 (UTC), 9.4hrs after the LVC Preliminary notice and 10.1hrs after the GW merger event at 2023-05-18 12:59:08 (UTC).\n\nObservations lasted between ~10hrs to 18hrs after the NSBH merger. We found no new transient sources that had not been previously detected by ATLAS before the GW event or reported to the IAU Transient name server. The depths of our images were shallower than normal due to weather conditions, ranging between m_o < 17.5 to m_o < 18.5.\n\nThe Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for Near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile.\n\n",
"published": "2023-05-19T18:09:27.982041Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-19T18:09:27.982061Z",
"modified": "2023-05-19T18:09:27.989986Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 1463,
"topic": "gcn.circular",
"uuid": "c543d854-3b98-4958-aa13-141471cc45d7",
"title": "Fermi GRB 230723A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/07/23 06:16:32 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34233",
"subject": "Fermi GRB 230723A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 230723A ( Fermi GBM team, GCN 34232) errorbox 552 sec after notice time and 586 sec after trigger time at 2023-07-23 04:48:29 UT, with upper limit up to 17.0 mag. The observations began at zenith distance = 57 deg. The sun altitude is -79.1 deg.\n\nThe galactic latitude b = -46 deg., longitude l = 299 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"43548\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 646 | 2023-07-23 04:48:29 | MASTER-OAFA | (01h 22m 59.72s , -71d 17m 29.3s) | C | 120 | 15.9 |\n 801 | 2023-07-23 04:48:29 | MASTER-OAFA | (01h 22m 59.76s , -71d 17m 29.2s) | C | 430 | 17.0 | Coadd\n 795 | 2023-07-23 04:50:48 | MASTER-OAFA | (01h 22m 53.01s , -71d 18m 28.8s) | C | 140 | 16.5 |\n 970 | 2023-07-23 04:53:28 | MASTER-OAFA | (01h 22m 54.39s , -71d 17m 31.5s) | C | 170 | 16.7 |\n 1165 | 2023-07-23 04:56:38 | MASTER-OAFA | (01h 23m 00.17s , -71d 18m 30.9s) | C | 180 | 15.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMDkyOTk3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.VwVP1885TDeVQag7WZKHX0WNU6SAqpk80WeQmMxnnCg\n\n",
"published": "2023-07-23T06:16:43.089759Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-23T06:16:43.089777Z",
"modified": "2023-07-23T06:16:43.098620Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 26,
"topic": "gcn.circular",
"uuid": "a36312b9-3ca8-4ea9-a775-9f5469bff6e6",
"title": "LIGO/Virgo/KAGRA S230520ae: Identification of a GW compact binary merger candidate: End-to-End Test",
"submitter": "Hop gcn.circular",
"authors": "Tatsuya Narikawa at LVK <narikawa@icrr.u-tokyo.ac.jp>",
"data": {
"date": "23/05/21 02:17:57 GMT",
"from": "Tatsuya Narikawa at LVK <narikawa@icrr.u-tokyo.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33838",
"subject": "LIGO/Virgo/KAGRA S230520ae: Identification of a GW compact binary merger candidate: End-to-End Test"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230520ae during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-05-20 22:48:42.560 UTC (GPS time: 1368658140.560). The candidate was found by the MBTA [1], CWB [2], PyCBC Live [3], SPIIR [4], and GstLAL [5] analysis pipelines.\n\nS230520ae is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.1e-09 Hz, or about one in 10 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S230520ae\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object has a mass < 3 solar masses (HasNS) is <1%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6]\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 29 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 1716 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1974 +/- 583 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide <https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Adams et al. CQG 33, 175012 (2016)\n [2] Klimenko et al. PRD 93, 042004 (2016)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Qi Chu, PhD Thesis, The University of Western Australia (2017)\n [5] Messick et al. PRD 95, 042001 (2017)\n [6] Chatterjee et al. The Astrophysical Journal 896, 1 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n",
"published": "2023-05-21T02:18:06.405293Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T02:18:06.405326Z",
"modified": "2023-05-21T02:18:06.413541Z",
"nonlocalizedevents": [
{
"event_id": "S230520a"
}
],
"targets": []
},
{
"id": 397,
"topic": "gcn.circular",
"uuid": "05fd3e1a-1d24-475d-8a12-3220a85ff993",
"title": "LIGO/Virgo/KAGRA S230615az: GRANDMA observations of GOTO and GIT candidates",
"submitter": "Hop gcn.circular",
"authors": "Aleksandra Pyshna at Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine <pyshnaya.sasha@gmail.com>",
"data": {
"date": "23/06/19 10:22:54 GMT",
"from": "Aleksandra Pyshna at Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine <pyshnaya.sasha@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34020",
"subject": "LIGO/Virgo/KAGRA S230615az: GRANDMA observations of GOTO and GIT candidates"
},
"message_text": "R. Strausbaugh (UMN), O. Pyshna (AO TSNU of Kyiv), T. du Laz (CIT),\nS. Pormente (OCA), A. Takey, A. Shokry, A. Fouad, M. Molham, A. Tawfeek\n(NRIAG), S. Antier (OCA), M. Coughlin (UMN), P. Hello (IJCLAB),\nS. Karpov, M. Prouza, M. MaÅ¡ek, M. Blazek (FZU), A. Klotz (IRAP),\nT. Pradier (Univ. Strasbourg), I. Tosta e Melo (UNICT), D. Turpin (CEA),\nO.Burkhonov (UBAI), S.Ehgamberdiev (UBAI, NUUz), Y.Rajabov (UBAI),\nT.Sadibekova (UBAI-CEA), Y.Tillayev (UBAI, NUUz), Xinglong ,\nF. Guo (THU), X. F. Wang (THU), Y. Zhu (NAOC), J. Zhang (NAOC),\nR. Inasaridze, R. Natsvlishvili, N. Kochiashvili, S. Beradze,\nV.Aivazyan (AbAO), report on behalf of the GRANDMA collaboration:\n\nThe GRANDMA telescope network responded to the GOTO and GIT triggers\nfrom LIGO/Virgo/KAGRA S230615az (Gompertz et al., GCN 33979, Kumar et al.,\nGCN 33974, TNS 2023kvr).\n\nThe first observations started 20 hours after the reported detection\ntime from the sources candidates.\n\nAs time reference (T0), we choose:\nfor GOTO23hn 2023-06-15T21:27:14.688 UT (60110.89392 MJD)\nfor GOTO23hu 2023-06-15T21:35:15.936 UT (60110.89949 MJD)\nfor GIT230615aa 2023-06-15T18:30:26.928 UT (60110.77114 MJD)\nfor GIT230615ab 2023-06-15T18:53:10.838 UT (60110.78693 MJD)\n\nIn the following table we report a subset of the preliminary photometry\nof our observations. Upper limits are reported as the faintest\nsource detected in frame; magnitudes and upper limits are reported\nin the AB system.\n\nGOTO23hn:\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)\n________________________________________________________________________\n0.847|60111.74163|AbAO-T70|14x60s|R| - | > 20.6\n0.956|60111.84993|KAO|7x120s|sdssr| 18.9 +/- 0.05 | -\n1.038|60111.93207|FRAM-CTA-N|28x120s|R| - | > 18.7\n\n\nGOTO23hu:\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)\n________________________________________________________________________\n0.862|60111.76180|AbAO-T70|15Ã60s|R| - | > 20.9\n0.984|60111.88393|FRAM-CTA-N|29x120s|R| - | > 18.6\n\n\nGIT230615aa:\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)\n________________________________________________________________________\n0.939|60111.71026|UBAI-NT60|10x180s|R| - | > 20.3\n0.942|60111.72810|SNOVA|2x180s|C| - | > 19.2\n1.099|60111.87106|KAO|7x120s|sdssr| - | > 20.3\n\n\nGIT230615ab:\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Mag +/- err |Upp.Lim. (AB)\n________________________________________________________________________\n0.954|60111.72906|SNOVA|1x180s|C| - | > 18.5\n0.997|60111.78488|AbAO-T70|12Ã60s|R| - | > 21\n1.037|60111.82444|KAO| 7x120s |sdssr| - | > 21.3\n\nKAO data has been calibrated with respect to the PS1 catalog.\nFRAM-CTA-N data has been calibrated with respect to the APASS catalog.\nAbastumani-T70 data has been calibrated with respect to the PS1 catalog.\n\nThis single detection of GOTO23hn indicates that the source is either flat\nor increasing in brightness, but we note the difficulty of comparing\nthis narrow-band value to the original wide-band detection by GOTO.\n\nGRANDMA is a worldwide coordinated telescope network\n(grandma.ijclab.in2p3.fr) devoted to the observation of transients\nin the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS\n497, 5518). Kilonova-Catcher (KNC) is the citizen science program of\nGRANDMA (http://kilonovacatcher.in2p3.fr/).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3MTcwMTc5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.weVR6f-gQ965yiJtjSeQ6n2g2UF3tDJasBoOxAvN59E\n\n",
"published": "2023-06-19T10:23:04.814157Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-19T10:23:04.814176Z",
"modified": "2023-06-19T10:23:04.821178Z",
"nonlocalizedevents": [
{
"event_id": "S230615a"
}
],
"targets": []
},
{
"id": 398,
"topic": "gcn.circular",
"uuid": "a39514b6-2624-4c69-825b-70f0becae58f",
"title": "LIGO/Virgo S230619i: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/19 10:24:35 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34021",
"subject": "LIGO/Virgo S230619i: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230619i errorbox 23805 sec after notice time and 23848 sec after trigger time at 2023-06-19 10:10:29 UT, with upper limit up to 12.5 mag. Observations started at twilight. The observations began at zenith distance = 67 deg. The sun altitude is -17.0 deg.\n\nThe galactic latitude b = -48 deg., longitude l = 216 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012138\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 22662 | 2023-06-19 09:49:13 | MASTER- | (23h 42m 22.90s , +81d 39m 09.5s) | C | 180 | 18.7 |\n 22862 | 2023-06-19 09:52:33 | MASTER- | (00h 35m 00.64s , +81d 38m 18.1s) | C | 180 | 16.6 |\n 23062 | 2023-06-19 09:55:53 | MASTER- | (23h 45m 21.09s , +79d 46m 41.0s) | C | 180 | 18.5 |\n 23263 | 2023-06-19 09:59:13 | MASTER- | (00h 28m 33.71s , +79d 44m 16.3s) | C | 180 | 16.1 |\n 23463 | 2023-06-19 10:02:34 | MASTER- | (23h 41m 51.58s , +81d 41m 09.0s) | C | 180 | 18.4 |\n 23664 | 2023-06-19 10:05:55 | MASTER- | (00h 34m 39.01s , +81d 38m 46.3s) | C | 180 | 16.4 |\n 23865 | 2023-06-19 10:09:15 | MASTER- | (23h 44m 51.68s , +79d 45m 15.0s) | C | 180 | 18.5 |\n 23938 | 2023-06-19 10:10:29 | MASTER-OAFA | (04h 21m 32.87s , -20d 16m 47.6s) | C | 180 | 12.5 |\n 24065 | 2023-06-19 10:12:36 | MASTER- | (00h 28m 16.55s , +79d 43m 58.3s) | C | 180 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3MTcwMjc3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.lyEz12zZSUHH3FZ9hSlYmPPkcyXRYAbOe-vl7Jvaq-M\n\n",
"published": "2023-06-19T10:24:42.076821Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-19T10:24:42.076840Z",
"modified": "2023-06-19T10:24:42.081898Z",
"nonlocalizedevents": [
{
"event_id": "S230619i"
}
],
"targets": []
},
{
"id": 16,
"topic": "gcn.circular",
"uuid": "e56fbcb5-7991-44f9-91c1-d8100598c79c",
"title": "GRB 230520A: MAXI/GSC detection",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/05/20 05:51:53 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33831",
"subject": "GRB 230520A: MAXI/GSC detection"
},
"message_text": "Y. Umeki (Miyazaki U.), M. Serino (AGU), Y. Kawakubo (LSU),\nH. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.),\nM. Shidatsu (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.),\nM. Sugizaki (NAOC),\nW. Iwakiri (Chiba U.)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray\ntransient source at 05:03:24 UT on 20 May 2023.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (142.422 deg, 1.524 deg) = (09 29 41, +01 31 26) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.04 deg and 0.03 deg, respectively.\nThe roll angle of long axis from the north direction is 90.0 deg counterclockwise.\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(142.239, 1.362) deg = (09 28 57, +01 21 43) (J2000)\n(142.281, 1.327) deg = (09 29 07, +01 19 37) (J2000)\n(142.576, 1.677) deg = (09 30 18, +01 40 37) (J2000)\n(142.535, 1.712) deg = (09 30 08, +01 42 43) (J2000)\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 1405 +- 69 mCrab\n(4.0-10.0keV, 1 sigma error).\nThere was no significant excess flux in the previous transit at 03:30 UT\nwith an upper limit of 20 mCrab.\n\n",
"published": "2023-05-20T05:52:01.565321Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T05:52:01.565349Z",
"modified": "2023-05-20T05:52:01.573194Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 17,
"topic": "gcn.circular",
"uuid": "cd1bf38e-b8b7-4cd3-8258-cd5a9e916c88",
"title": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for Swope candidates: SSS23a, SSS23b and SSS23c",
"submitter": "Hop gcn.circular",
"authors": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"data": {
"date": "23/05/20 12:10:28 GMT",
"from": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33832",
"subject": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for Swope candidates: SSS23a, SSS23b and SSS23c"
},
"message_text": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for Swope candidates: SSS23a, SSS23b and SSS23c \n\nS. R. Oates (U. of Birmingham), A. A. Breeveld (MSSL-UCL), P. Brown (TAMU),\nM. De Pasquale (U. Messina), C. Gronwall (PSU), N. Klingler (NASA-GSFC/UMBC/CRESST II),\nN. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), M. J. Page (UCL-MSSL),\nM. H. Siegel (PSU), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB),\nS. Campana (INAF-OAB), S.B. Cenko (NASA/GSFC), A. DâAì (INAF-IASFPA), P. DâAvanzo (INAF-OAB),\nV. DâElia (ASI-SSDC & INAF-OAR), S. Dichiara (PSU), P.A. Evans (U. Leicester),\nR.A.J. Eyles-Ferris (U. Leicester), D. Hartmann (Clemson University),\nJ.A. Kennea (PSU), S. Laha (NASA/GSFC), A.Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB),\nJ.A. Nousek (PSU), P. OâBrien (U. Leicester), J.P. Osborne (U. Leicester),\nK.L. Page (U. Leicester), D. M. Palmer (LANL), S. Ronchini (PSU), T. Sbarrato (INAF-OAB),\nB. Sbarufatti (INAF-OAB), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (U. Toronto),\nE. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nWe report Swift/UVOT observations of the candidates SSS23a, SSS23b and SSS23c (Coulter et al.,\nGCN Circ. 33829) found by the Swope 1-m telescope during the search for the EM counterpart\nof the LVC event S230518h (LIGO/VIRGO/KAGRA Collaboration GCN Circ. 33813). \n\nSwift/UVOT observations of the Swope candidates began 1.5 days after the LVK trigger\n(LIGO/VIRGO/KAGRA Collaboration GCN Circ. 33813). We do not detect any of the 3 Swope candidates\nin the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are:\n\nTarget Filter T_start(s) T_stop(s) Exp(s) 3sigUL\n\nSSS23a u 129503 135881 288 >19.2\nSSS23a w1 129079 135788 585 >19.9\nSSS23a m2 128445 135607 879 >20.2\nSSS23a w2 129713 136188 753 >20.1\n \t \t \nSSS23b u 140770 140997 223 >19.1\nSSS23b w1 140310 140765 448 >19.8\nSSS23b m2 139622 140304 671 >20.1\nSSS23b w2 141004 141319 309 >19.6\n \t \t \nSSS23c u 130526 141885 131 >18.7\nSSS23c w1 130415 141799 264 >19.3\nSSS23c m2 130250 141633 395 >19.6\nSSS23c w2 130586 142008 133 >19.0\n\nThis circular is an official product of the Swift team.\n\n",
"published": "2023-05-20T12:10:37.046986Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T12:10:37.047005Z",
"modified": "2023-05-20T12:10:37.052619Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 18,
"topic": "gcn.circular",
"uuid": "8411b944-d26f-4cf8-92e1-6d2332d5da18",
"title": "LIGO/Virgo/KAGRA S230518h: GECKO tiling observations with KMTNet",
"submitter": "Hop gcn.circular",
"authors": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"data": {
"date": "23/05/20 13:40:33 GMT",
"from": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33833",
"subject": "LIGO/Virgo/KAGRA S230518h: GECKO tiling observations with KMTNet"
},
"message_text": "Gregory S.-H. Paek, Myungshin Im, Mankeun Jeong, Seo-Won Chang, Hyeonho\nChoi, Sophia Kim, Elahe Khalouei (SNU/SNU ARC), and Chung-Uk Lee (KASI), on behalf of the GECKO Team\n\nWe report the optical observations conducted with the KMTNet telescopes of the 90 % localization area of of the LIGO/Virgo/KAGRA gravitational-wave event, S230518h (The LVK Collaboration, GCN 33816). The KMTNet is a system made of three 1.6-meter class telescopes each at SAAO in South Africa, CTIO in Chile, and SSO in Australia. The KMTNet field of view of a single pointing covers a ~2 deg by 2 deg area.\n\nThe KMTNet observation started at 2023-05-18 17:31 (UT) or about 4.53 hrs\nafter the GW alert, and we took a series of R-band images for 2*120sec per field. As a result, we covered 59 tiles (~230 deg^2) within the localization area. The preliminary depths of these images are 22 magnitudes for a 5-sigma detection of point sources.\n\n------------------------------------------------------------------------\nt-t0[day] DATE-OBS[UTC] OBSERVAT RA DEC FILTER\n------------------------------------------------------------------------\n0.189 2023-05-18T17:31:36 SAAO 07:07:21.280 -31:59:59.00 R\n0.194 2023-05-18T17:37:50 SAAO 07:10:00.030 -37:59:59.90 R\n0.198 2023-05-18T17:44:29 SAAO 07:08:06.490 -35:59:59.80 R\n0.203 2023-05-18T17:51:32 SAAO 08:11:42.420 -77:59:59.90 R\n0.207 2023-05-18T17:57:52 SAAO 08:13:42.860 -79:59:59.80 R\n0.212 2023-05-18T18:03:48 SAAO 07:43:43.690 -71:59:59.80 R\n0.216 2023-05-18T18:09:58 SAAO 07:38:10.850 -83:59:59.80 R\n0.220 2023-05-18T18:16:06 SAAO 07:45:13.770 -69:59:59.80 R\n0.225 2023-05-18T18:22:25 SAAO 08:16:33.060 -81:59:59.70 R\n0.229 2023-05-18T18:28:44 SAAO 08:10:12.780 -75:59:59.80 R\n0.233 2023-05-18T18:35:04 SAAO 08:06:45.600 -67:59:59.90 R\n0.238 2023-05-18T18:41:23 SAAO 07:39:34.490 -75:59:59.90 R\n0.242 2023-05-18T18:47:36 SAAO 08:43:38.220 -83:59:59.90 R\n0.428 2023-05-18T23:15:22 CTIO 07:09:08.320 -33:59:59.90 R\n0.449 2023-05-18T23:46:11 CTIO 07:34:44.200 -52:00:00.00 R\n0.454 2023-05-18T23:52:30 CTIO 07:42:23.090 -53:59:59.90 R\n0.459 2023-05-18T23:59:28 CTIO 07:45:27.280 -58:00:00.00 R\n0.463 2023-05-19T00:05:48 CTIO 07:36:34.750 -78:00:00.40 R\n0.467 2023-05-19T00:12:00 CTIO 07:36:55.300 -56:00:00.00 R\n0.476 2023-05-19T00:24:14 CTIO 08:08:07.970 -72:00:00.20 R\n0.482 2023-05-19T00:33:33 CTIO 07:44:30.960 -60:00:00.00 R\n0.487 2023-05-19T00:40:41 CTIO 07:24:42.400 -41:59:59.90 R\n0.496 2023-05-19T00:53:27 CTIO 08:09:03.220 -74:00:00.20 R\n0.498 2023-05-19T00:56:48 CTIO 07:36:35.100 -47:59:59.90 R\n0.503 2023-05-19T01:03:04 CTIO 08:07:23.000 -70:00:00.10 R\n0.508 2023-05-19T01:10:00 CTIO 07:47:31.840 -66:00:00.00 R\n0.512 2023-05-19T01:16:57 CTIO 08:46:49.440 -78:00:00.40 R\n0.517 2023-05-19T01:23:20 CTIO 08:40:50.860 -76:00:00.30 R\n0.521 2023-05-19T01:29:31 CTIO 08:36:13.420 -74:00:00.20 R\n0.525 2023-05-19T01:35:43 CTIO 08:32:32.370 -72:00:00.10 R\n0.793 2023-05-19T08:01:18 SSO 07:46:28.480 -67:59:59.80 R\n0.837 2023-05-19T09:04:10 SSO 07:17:50.270 -35:59:59.60 R\n0.841 2023-05-19T09:10:46 SSO 07:29:01.780 -59:59:59.60 R\n0.846 2023-05-19T09:17:26 SSO 07:41:52.780 -73:59:59.70 R\n0.853 2023-05-19T09:26:53 SSO 07:55:06.650 -61:52:59.60 R\n0.855 2023-05-19T09:29:57 SSO 08:06:13.800 -65:59:59.60 R\n0.859 2023-05-19T09:36:25 SSO 08:29:32.030 -69:59:59.70 R\n1.174 2023-05-19T17:09:20 SAAO 06:44:29.820 -19:08:55.90 R\n1.178 2023-05-19T17:15:29 SAAO 06:21:24.190 -11:29:19.70 R\n1.185 2023-05-19T17:25:58 SAAO 06:50:13.920 -24:53:37.90 R\n1.188 2023-05-19T17:29:38 SAAO 06:45:31.020 -22:58:43.90 R\n1.192 2023-05-19T17:35:49 SAAO 06:48:59.840 -26:48:31.90 R\n1.197 2023-05-19T17:42:12 SAAO 06:57:31.010 -26:48:32.00 R\n1.201 2023-05-19T17:48:32 SAAO 06:40:54.490 -21:03:49.90 R\n1.206 2023-05-19T17:55:17 SAAO 06:56:23.010 -28:43:22.90 R\n1.210 2023-05-19T18:01:27 SAAO 06:53:47.500 -22:58:43.80 R\n1.220 2023-05-19T18:15:24 SAAO 06:59:32.900 -29:52:59.80 R\n1.222 2023-05-19T18:19:12 SAAO 06:58:36.200 -24:53:37.80 R\n1.226 2023-05-19T18:24:25 SAAO 07:05:03.610 -28:43:23.10 R\n1.230 2023-05-19T18:29:49 SAAO 07:26:53.800 -81:59:59.90 R\n1.234 2023-05-19T18:36:37 SAAO 07:27:16.320 -43:59:59.70 R\n1.238 2023-05-19T18:42:34 SAAO 07:27:43.890 -49:59:59.90 R\n1.245 2023-05-19T18:51:37 SAAO 07:39:49.890 -49:59:59.90 R\n1.249 2023-05-19T18:57:44 SAAO 07:38:10.800 -61:59:59.80 R\n1.252 2023-05-19T19:02:27 SAAO 07:50:46.190 -55:59:59.90 R\n1.263 2023-05-19T19:17:49 SAAO 08:00:00.020 -59:59:59.90 R\n1.270 2023-05-19T19:28:05 SAAO 08:56:23.500 -79:52:59.80 R\n1.272 2023-05-19T19:31:16 SAAO 09:06:12.490 -81:59:59.90 R\n1.277 2023-05-19T19:37:38 SAAO 09:49:05.440 -83:59:59.80 R\n\nWe have reference images for most of the observed fields from the KMTNet Synoptic Survey of Southern SKy (KS4) project. Detailed photometry and transient search analyses are underway.\n\nGravitational-wave EM Counterpart Korean Observatory (GECKO) is a network of 10+ 0.5m to 1m class telescopes worldwide. KMTNet is operated by the Korea Astronomy and Space Science Institute. We thank the KMTNet operators for their support for the KMTNet observations.\n\n",
"published": "2023-05-20T13:40:42.107461Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T13:40:42.107483Z",
"modified": "2023-05-20T13:40:42.115007Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 19,
"topic": "gcn.circular",
"uuid": "dfb5c41d-d2de-4545-b7d8-b751800928c8",
"title": "LIGO/Virgo/KAGRA S230518h: ATCA follow-up of candidate counterparts",
"submitter": "Hop gcn.circular",
"authors": "Dougal Dobie at VAST <ddobie94@gmail.com>",
"data": {
"date": "23/05/20 14:56:35 GMT",
"from": "Dougal Dobie at VAST <ddobie94@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33834",
"subject": "LIGO/Virgo/KAGRA S230518h: ATCA follow-up of candidate counterparts"
},
"message_text": "D. Dobie (Swinburne/OzGrav), A. Gulati (USyd/OzGrav), T. Murphy\n(USyd/OzGrav)\nand the JAGWAR collaboration.\n\nWe have conducted observations of the three candidate optical counterparts\nto\nS230518h (GCN 33829) and the X-ray source S230518h_X8 (GCN 33824) with the\nAustralia Telescope Compact Array.\n\nObservations were carried out on 2023-05-20 between 02:40 and 13:30 UTC\nwith 2x2048 MHz bands centered on 5.5 and 9 GHz. The array is currently in\nthe compact EW352 configuration and hence we discarded all data from CA06,\nresulting in a FWHM angular resolution of approximately 30\" and 20\" at\n5.5 GHz and 9 GHz respectively.\n\nWe detect no radio emission at the location of the optical candidates\nwith the following preliminary 3-sigma upper limits:\n\n| Source | 5.5 GHz (uJy) | 9 GHz (uJy) |\n| SSS23a | <90 | <50 |\n| SSS23b | <120 | <90 |\n| SSS23c | <120 | <60 |\n\nWe detect a radio source consistent with the position of S230518h_X8 with\npreliminary flux densities of ~350 uJy and ~500 uJy at 5.5 GHz and 9 GHz.\nThis source was also detected by the Rapid ASKAP Continuum Survey in\nobservations on 2019-08-03, suggesting it is unrelated to S230518h.\n\nThank you to CSIRO staff for supporting these observations.\n\n",
"published": "2023-05-20T14:56:46.569485Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T14:56:46.569506Z",
"modified": "2023-05-20T14:56:46.574848Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 22,
"topic": "gcn.circular",
"uuid": "bd7eb048-94f1-4fe8-9127-40f530514b2b",
"title": "LIGO/Virgo/KAGRA S230520ae: Upper limits from IceCube neutrino search",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/05/20 23:20:41 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33835",
"subject": "LIGO/Virgo/KAGRA S230520ae: Upper limits from IceCube neutrino search"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nSearches for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S230520ae in a time range of 1000 seconds centered on the alert event time (2023-05-20 22:40:22.000 UTC to 2023-05-20 22:57:02.000 UTC) have been performed [1,2].\n\nDuring this time period IceCube was collecting good quality data. No significant track-like events are found in spatial coincidence of S230520ae calculated from the map circulated in the 2-Preliminary notice.\n\nIceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of S230520ae ranges from 0.028 to 1.133 GeV cm^-2 in a 1000 second time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n\n",
"published": "2023-05-20T23:20:50.559015Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T23:20:50.559035Z",
"modified": "2023-05-20T23:20:50.565203Z",
"nonlocalizedevents": [
{
"event_id": "S230520a"
}
],
"targets": []
},
{
"id": 23,
"topic": "gcn.circular",
"uuid": "2bc13971-7699-4b02-bdba-04aa481df7fd",
"title": "GRB 230520B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/20 23:22:06 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33836",
"subject": "GRB 230520B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:11:39 UT on 20 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230520B (trigger 706317104.139708 / 230520966).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 31.7, Dec = -62.1 (J2000 degrees, equivalent to J2000 02h 06m, -62d 06'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 152.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230520966/quicklook/glg_skymap_all_bn230520966.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230520966/quicklook/glg_healpix_all_bn230520966.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230520966/quicklook/glg_lc_medres34_bn230520966.gif\n\n",
"published": "2023-05-20T23:22:11.705262Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-20T23:22:11.705296Z",
"modified": "2023-05-20T23:22:11.710250Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 24,
"topic": "gcn.circular",
"uuid": "5757fc90-0d02-48ea-bf64-16b4e51d7141",
"title": "GRB 230520B is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Suraj Poolakkil at UAH <sp0076@uah.edu>",
"data": {
"date": "23/05/21 00:41:11 GMT",
"from": "Suraj Poolakkil at UAH <sp0076@uah.edu>",
"title": "GCN CIRCULAR",
"number": "33837",
"subject": "GRB 230520B is not a GRB"
},
"message_text": "S. Poolakkil (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor\nTeam:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 706317104/230520966 at 23:11:39.14 UT\non 20 May 2023, tentatively classified as GRB 230520B (GCN 33836), is\nin fact not due to a GRB. This trigger is likely due to Local Particles.\"\n\n",
"published": "2023-05-21T00:41:19.724037Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T00:41:19.724056Z",
"modified": "2023-05-21T00:41:19.730811Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 27,
"topic": "gcn.circular",
"uuid": "822827d8-b48a-41a3-85fd-1b5cb74e4808",
"title": "GRB 230521A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/21 05:13:46 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33839",
"subject": "GRB 230521A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 05:03:23 UT on 21 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230521A (trigger 706338208.733194 / 230521211).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 37.0, Dec = 7.6 (J2000 degrees, equivalent to J2000 02h 28m, 7d 35'), with a statistical uncertainty of 7.8 degrees.\n\nThe angle from the Fermi LAT boresight is 54.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_skymap_all_bn230521211.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_healpix_all_bn230521211.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230521211/quicklook/glg_lc_medres34_bn230521211.gif\n\n",
"published": "2023-05-21T05:14:04.288264Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T05:14:04.288287Z",
"modified": "2023-05-21T05:14:04.296570Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 28,
"topic": "gcn.circular",
"uuid": "3266d7d0-0c4e-4dbd-a175-4637e36122a9",
"title": "GRB 230520A: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/05/21 06:10:46 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "33840",
"subject": "GRB 230520A: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "T. Sakamoto, A. Yoshida, S. Sugita (AGU), Y. Kawakubo (LSU),\nK. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka (ICRR),\nS. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 230520A (MAXI/GSC detection: Umeki et al.,\nGCN Circ. 33831) was detected in the ground analysis of the CALET\nGamma-ray Burst Monitor (CGBM) data around 05:03:24 UTC on 20\nMay 2023 (referenced to GCN Circ 33831).\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows a multi-peaked structure that starts\nat T-82.9 sec, peaks at T+9.0 sec, and ends at T+34.9 sec.\nThe T90 and T50 durations measured by the SGM data are 98.1 +/- 4.3 sec\nand 67.5 +/- 3.7 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1368594148/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n",
"published": "2023-05-21T06:10:55.090245Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T06:10:55.090267Z",
"modified": "2023-05-21T06:10:55.119342Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 29,
"topic": "gcn.circular",
"uuid": "9d3af75e-9441-43ea-839c-e7932a8db7fb",
"title": "Fermi trigger No 706317104: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/21 07:30:28 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33841",
"subject": "Fermi trigger No 706317104: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230520.97 (trigger No 706317104,02h 06m 57.60s , -62d 06m 00.0s, R=1) errorbox 876 sec after notice time and 891 sec after trigger time at 2023-05-20 23:26:30 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 79 deg. The sun altitude is -21.6 deg.\n\nThe galactic latitude b = -53 deg., longitude l = 288 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"17848\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 982 | 2023-05-20 23:26:30 | MASTER-OAFA | (02h 05m 10.53s , -61d 58m 31.5s) | C | 180 | 17.2 |\n 1516 | 2023-05-20 23:35:24 | MASTER-OAFA | (02h 05m 09.55s , -61d 58m 25.6s) | C | 180 | 17.4 |\n 1794 | 2023-05-20 23:40:03 | MASTER-OAFA | (02h 10m 48.64s , -62d 28m 53.3s) | C | 180 | 12.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-21T07:30:37.383534Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T07:30:37.383554Z",
"modified": "2023-05-21T07:30:37.389503Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 30,
"topic": "gcn.circular",
"uuid": "a4137af6-7657-4fac-8aed-7005b574dedb",
"title": "Fermi trigger No 706331483: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/21 07:30:33 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33842",
"subject": "Fermi trigger No 706331483: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230521.13 (trigger No 706331483,07h 27m 07.92s , -42d 13m 01.2s, R=9.37) errorbox 1678 sec after notice time and 1710 sec after trigger time at 2023-05-21 03:39:49 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 84 deg. The sun altitude is -74.1 deg.\n\nThe galactic latitude b = -12 deg., longitude l = 255 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"17904\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 1801 | 2023-05-21 03:39:49 | MASTER-OAFA | (07h 19m 34.31s , -44d 11m 10.4s) | C | 180 | 16.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-21T07:30:42.402752Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T07:30:42.402773Z",
"modified": "2023-05-21T07:30:42.407505Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 42,
"topic": "gcn.circular",
"uuid": "fba05ccc-392a-4edd-aafb-78d9529ef9e2",
"title": "LIGO/Virgo/KAGRA S230522a: 2 counterpart neutrino candidates from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/05/22 12:26:35 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33850",
"subject": "LIGO/Virgo/KAGRA S230522a: 2 counterpart neutrino candidates from IceCube neutrino searches"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S230522a in a time range of 1000 seconds centered on the alert event time (2023-05-22 09:29:45.000 UTC to 2023-05-22 09:46:25.000 UTC) have been performed [1,2]. During this time period IceCube was collecting good quality data. The search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap.\n\n2 track-like event(s) are found in spatial and temporal coincidence with the gravitational-wave candidate S230522a calculated from the map circulated in the 2-Preliminary notice. This represents an overall p-value of 0.04 (1.8 sigma). These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 78.93, dec -37.54 degrees. The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates.\n\nProperties of the coincident events are shown below.\n\n dt ra dec Angular Uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n-152.13 78.98 -37.59 0.43 0.04 n/a\n73.08 127.79 -8.33 0.43 0.09 n/a\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle representing 90\\% CL containment by area.\np-value = the p-value for this specific track event from each search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n\n",
"published": "2023-05-22T12:26:44.607744Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T12:26:44.607764Z",
"modified": "2023-05-22T12:26:44.614709Z",
"nonlocalizedevents": [
{
"event_id": "S230522a"
}
],
"targets": []
},
{
"id": 54,
"topic": "gcn.circular",
"uuid": "04c85501-b21e-46c5-9fca-a7a02d6ed566",
"title": "GRB 230523B: Name correction from GCN Circular 33859",
"submitter": "Hop gcn.circular",
"authors": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"data": {
"date": "23/05/23 23:04:04 GMT",
"from": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33860",
"subject": "GRB 230523B: Name correction from GCN Circular 33859"
},
"message_text": "GCN Circular 33859 incorrectly named \"Swift/BAT-GUANO detection of a short hard burst\" for a GRB at T0: 2023-05-23T15:23:52.68 UTC as GRB 230523A.\nThis burst should instead be named GRB 230523B.\nI apologize for the mistake.\n\n",
"published": "2023-05-23T23:04:11.421538Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T23:04:11.421560Z",
"modified": "2023-05-23T23:04:11.427526Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 31,
"topic": "gcn.circular",
"uuid": "859063ae-61cf-4bd0-aaea-0f5e817babd1",
"title": "IPN triangulation of GRB 230518A (short)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "23/05/21 13:50:51 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "33843",
"subject": "IPN triangulation of GRB 230518A (short)"
},
"message_text": "D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,\non behalf of the IPN,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nand\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team, report:\n\n\nThe short-duration GRB 230518A\n(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 33822;\nSwift-BAT/GUANO detection: Ronchini, GCN Circ. 33825)\nhas been detected by Fermi (GBM trigger 706142972), Swift (BAT),\nand INTEGRAL (SPI-ACS), so far, at about 82168 s UT (22:49:28).\nThe burst was outside the coded field of view of the BAT.\n\nWe have triangulated it to a GBM-SPI-ACS annulus centered at\nRA(2000)\u0019.521 deg (01h 18m 05s) Dec(2000)=-66.594 deg (-66d 35' 40\")\nwhose radius is 88.662 +/- 2.786 deg (3 sigma).\n\nThe annulus combined with the Fermi-GBM final position (GCN 33822;\nglg_healpix_all_bn230518951_v00) gives 480 sq. deg (3 sigma) localization region.\n\nThe localization is inconsistent with the localization of the NSBH merger event candidate S230518h (LVK Collaborations, GCN Circ. 33813, 33816).\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230518_T82167/IPN/\n\n",
"published": "2023-05-21T13:51:01.068272Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T13:51:01.068293Z",
"modified": "2023-05-21T13:51:01.073447Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 32,
"topic": "gcn.circular",
"uuid": "31842754-aaac-4ff7-a51f-b995f374db98",
"title": "Fermi trigger No 706328428: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/21 18:30:44 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33844",
"subject": "Fermi trigger No 706328428: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB230521.10 (trigger No 706328428,03h 09m 24.00s , +22d 24m 00.0s, R .7833) errorbox 51447 sec after notice time and 51478 sec after trigger time at 2023-05-21 16:38:22 UT, with upper limit up to 15.7 mag. The observations began at zenith distance = 85 deg. The sun altitude is -18.1 deg.\n\nThe galactic latitude b = -30 deg., longitude l = 161 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"17885\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 51569 | 2023-05-21 16:38:22 | MASTER-Amur | (02h 10m 05.21s , +37d 24m 21.1s) | C | 180 | 13.8 |\n 53309 | 2023-05-21 17:07:22 | MASTER-Amur | (02h 06m 58.70s , +35d 30m 02.6s) | C | 180 | 15.7 |\n 53521 | 2023-05-21 17:10:54 | MASTER-Amur | (02h 04m 11.90s , +33d 37m 56.1s) | C | 180 | 15.6 |\n 54413 | 2023-05-21 17:25:46 | MASTER-Amur | (02h 01m 42.41s , +31d 42m 14.7s) | C | 180 | 15.6 |\n 56418 | 2023-05-21 17:59:11 | MASTER-Amur | (02h 01m 40.50s , +31d 42m 16.9s) | C | 180 | 14.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-21T18:30:57.303104Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T18:30:57.303124Z",
"modified": "2023-05-21T18:30:57.309156Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 33,
"topic": "gcn.circular",
"uuid": "a43acbc1-1e99-4a30-ab9a-8434871176a1",
"title": "LIGO/Virgo S230520ae: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/21 20:30:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33845",
"subject": "LIGO/Virgo S230520ae: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230520ae errorbox 304 sec after trigger time at 2023-05-20 22:53:46 UT, with upper limit up to 18.9 mag. Observations started at twilight. The observations began at zenith distance = 35 deg. The sun altitude is -14.8 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230520ae errorbox 4019 sec after trigger time at 2023-05-20 23:55:41 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 70 deg. The sun altitude is -68.4 deg.\n\nThe galactic latitude b = -7 deg., longitude l = 331 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011868\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 395 | 2023-05-20 22:53:46 | MASTER-OAFA | (08h 34m 59.46s , -04d 04m 10.4s) | C | 180 | 18.8 |\n 1400 | 2023-05-20 23:10:31 | MASTER-OAFA | (08h 35m 02.58s , -04d 06m 16.3s) | C | 180 | 18.9 |\n 4110 | 2023-05-20 23:55:41 | MASTER-SAAO | (06h 50m 26.15s , -76d 35m 50.3s) | C | 180 | 13.5 |\n 4110 | 2023-05-20 23:55:41 | MASTER-SAAO | (06h 46m 47.54s , -76d 33m 59.0s) | C | 180 | 13.5 |\n 5801 | 2023-05-21 00:23:53 | MASTER-SAAO | (07h 55m 50.75s , -70d 51m 03.9s) | C | 180 | 14.2 |\n 5802 | 2023-05-21 00:23:53 | MASTER-SAAO | (07h 53m 14.78s , -70d 49m 02.1s) | C | 180 | 14.2 |\n 6470 | 2023-05-21 00:35:01 | MASTER-SAAO | (07h 31m 33.92s , -70d 52m 26.0s) | C | 180 | 18.3 |\n 6470 | 2023-05-21 00:35:01 | MASTER-SAAO | (07h 29m 00.58s , -70d 50m 24.1s) | C | 180 | 18.5 |\n 6680 | 2023-05-21 00:38:32 | MASTER-SAAO | (07h 55m 56.61s , -70d 52m 41.6s) | C | 180 | 17.3 |\n 6680 | 2023-05-21 00:38:32 | MASTER-SAAO | (07h 53m 23.13s , -70d 50m 39.1s) | C | 180 | 17.7 |\n 7338 | 2023-05-21 00:49:30 | MASTER-SAAO | (06h 00m 22.16s , -88d 03m 52.5s) | C | 180 | 14.6 |\n 7338 | 2023-05-21 00:49:30 | MASTER-SAAO | (05h 35m 33.68s , -88d 03m 56.6s) | C | 180 | 14.6 |\n 7773 | 2023-05-21 00:56:45 | MASTER-SAAO | (10h 28m 59.42s , -85d 54m 52.0s) | C | 180 | 13.4 |\n 7773 | 2023-05-21 00:56:45 | MASTER-SAAO | (10h 40m 37.79s , -85d 55m 57.8s) | C | 180 | 14.3 |\n 7985 | 2023-05-21 01:00:16 | MASTER-SAAO | (12h 34m 18.64s , -85d 57m 38.1s) | C | 180 | 17.5 |\n 7985 | 2023-05-21 01:00:16 | MASTER-SAAO | (12h 22m 27.76s , -85d 56m 20.2s) | C | 180 | 17.5 |\n 8206 | 2023-05-21 01:03:58 | MASTER-SAAO | (06h 01m 01.31s , -88d 03m 33.7s) | C | 180 | 18.8 |\n 8206 | 2023-05-21 01:03:58 | MASTER-SAAO | (05h 36m 25.68s , -88d 03m 40.2s) | C | 180 | 18.7 |\n 8431 | 2023-05-21 01:07:42 | MASTER-SAAO | (09h 49m 30.66s , -87d 50m 58.8s) | C | 180 | 19.2 |\n 8431 | 2023-05-21 01:07:42 | MASTER-SAAO | (10h 11m 31.17s , -87d 52m 07.7s) | C | 180 | 19.1 |\n 8642 | 2023-05-21 01:11:13 | MASTER-SAAO | (10h 40m 53.84s , -85d 55m 50.8s) | C | 180 | 19.0 |\n 8642 | 2023-05-21 01:11:13 | MASTER-SAAO | (10h 29m 19.50s , -85d 54m 47.0s) | C | 180 | 19.1 |\n 8853 | 2023-05-21 01:14:45 | MASTER-SAAO | (12h 34m 36.01s , -85d 56m 39.0s) | C | 180 | 18.8 |\n 8853 | 2023-05-21 01:14:45 | MASTER-SAAO | (12h 22m 51.95s , -85d 55m 21.3s) | C | 180 | 19.0 |\n 9067 | 2023-05-21 01:18:18 | MASTER-SAAO | (06h 48m 02.14s , -86d 08m 48.4s) | C | 180 | 19.0 |\n 9067 | 2023-05-21 01:18:18 | MASTER-SAAO | (06h 35m 36.74s , -86d 08m 00.8s) | C | 180 | 19.1 |\n 9278 | 2023-05-21 01:21:50 | MASTER-SAAO | (08h 28m 48.43s , -86d 02m 35.2s) | C | 180 | 18.6 |\n 9278 | 2023-05-21 01:21:50 | MASTER-SAAO | (08h 16m 18.52s , -86d 00m 39.3s) | C | 180 | 18.8 |\n 9704 | 2023-05-21 01:28:55 | MASTER-SAAO | (05h 01m 59.48s , -86d 14m 35.5s) | C | 180 | 18.9 |\n 9915 | 2023-05-21 01:32:26 | MASTER-SAAO | (06h 48m 41.99s , -86d 07m 21.2s) | C | 180 | 18.6 |\n 9915 | 2023-05-21 01:32:26 | MASTER-SAAO | (06h 36m 13.31s , -86d 06m 36.4s) | C | 180 | 18.6 |\n 10127 | 2023-05-21 01:35:58 | MASTER-SAAO | (08h 29m 06.72s , -86d 03m 38.5s) | C | 180 | 18.1 |\n 10127 | 2023-05-21 01:35:58 | MASTER-SAAO | (08h 16m 36.28s , -86d 01m 42.5s) | C | 180 | 18.2 |\n 10552 | 2023-05-21 01:43:04 | MASTER-SAAO | (05h 02m 15.50s , -86d 15m 29.1s) | C | 180 | 17.5 |\n 10975 | 2023-05-21 01:50:07 | MASTER-SAAO | (05h 45m 39.73s , -84d 16m 12.5s) | C | 180 | 18.4 |\n 10975 | 2023-05-21 01:50:07 | MASTER-SAAO | (05h 54m 10.14s , -84d 17m 06.9s) | C | 180 | 18.4 |\n 11187 | 2023-05-21 01:53:38 | MASTER-SAAO | (06h 56m 48.03s , -84d 11m 55.5s) | C | 180 | 18.9 |\n 11187 | 2023-05-21 01:53:38 | MASTER-SAAO | (07h 05m 13.36s , -84d 12m 56.9s) | C | 180 | 18.9 |\n 11398 | 2023-05-21 01:57:09 | MASTER-SAAO | (08h 04m 42.42s , -84d 08m 43.0s) | C | 180 | 18.7 |\n 11398 | 2023-05-21 01:57:09 | MASTER-SAAO | (08h 13m 13.68s , -84d 10m 38.6s) | C | 180 | 18.7 |\n 11821 | 2023-05-21 02:04:12 | MASTER-SAAO | (05h 45m 43.25s , -84d 17m 58.3s) | C | 180 | 18.7 |\n 11821 | 2023-05-21 02:04:12 | MASTER-SAAO | (05h 54m 27.78s , -84d 19m 02.4s) | C | 180 | 18.6 |\n 12033 | 2023-05-21 02:07:44 | MASTER-SAAO | (06h 57m 08.14s , -84d 12m 38.6s) | C | 180 | 18.8 |\n 12033 | 2023-05-21 02:07:44 | MASTER-SAAO | (07h 05m 42.68s , -84d 13m 44.3s) | C | 180 | 18.9 |\n 12244 | 2023-05-21 02:11:15 | MASTER-SAAO | (08h 04m 54.44s , -84d 09m 42.3s) | C | 180 | 18.8 |\n 12244 | 2023-05-21 02:11:15 | MASTER-SAAO | (08h 13m 24.73s , -84d 11m 38.0s) | C | 180 | 18.8 |\n 12454 | 2023-05-21 02:14:45 | MASTER-SAAO | (09h 15m 06.19s , -84d 06m 09.5s) | C | 180 | 18.9 |\n 12454 | 2023-05-21 02:14:45 | MASTER-SAAO | (09h 23m 36.32s , -84d 08m 07.7s) | C | 180 | 18.9 |\n 12677 | 2023-05-21 02:18:28 | MASTER-SAAO | (11h 01m 08.27s , -84d 02m 54.6s) | C | 180 | 18.4 |\n 12677 | 2023-05-21 02:18:29 | MASTER-SAAO | (10h 53m 11.45s , -84d 01m 51.7s) | C | 180 | 18.6 |\n 12890 | 2023-05-21 02:22:01 | MASTER-SAAO | (05h 20m 00.32s , -82d 27m 45.4s) | C | 180 | 17.1 |\n 13102 | 2023-05-21 02:25:33 | MASTER-SAAO | (06h 14m 12.94s , -82d 22m 49.6s) | C | 180 | 16.6 |\n 13102 | 2023-05-21 02:25:33 | MASTER-SAAO | (06h 20m 29.05s , -82d 23m 52.7s) | C | 180 | 16.7 |\n 13313 | 2023-05-21 02:29:05 | MASTER-SAAO | (09h 15m 31.51s , -84d 05m 21.9s) | C | 180 | 19.0 |\n 13313 | 2023-05-21 02:29:05 | MASTER-SAAO | (09h 23m 57.96s , -84d 07m 19.5s) | C | 180 | 18.9 |\n 13534 | 2023-05-21 02:32:45 | MASTER-SAAO | (11h 01m 26.59s , -84d 05m 04.1s) | C | 180 | 18.4 |\n 13534 | 2023-05-21 02:32:45 | MASTER-SAAO | (10h 53m 29.73s , -84d 04m 02.3s) | C | 180 | 18.7 |\n 13746 | 2023-05-21 02:36:17 | MASTER-SAAO | (05h 20m 04.03s , -82d 26m 11.4s) | C | 180 | 19.2 |\n 13957 | 2023-05-21 02:39:48 | MASTER-SAAO | (06h 14m 11.06s , -82d 22m 32.0s) | C | 180 | 19.1 |\n 13957 | 2023-05-21 02:39:48 | MASTER-SAAO | (06h 20m 26.60s , -82d 23m 35.1s) | C | 180 | 19.2 |\n 14167 | 2023-05-21 02:43:18 | MASTER-OAFA | (08h 19m 51.05s , -68d 48m 26.7s) | C | 180 | 18.6 |\n 14366 | 2023-05-21 02:46:37 | MASTER-OAFA | (08h 42m 21.18s , -68d 47m 25.5s) | C | 180 | 18.5 |\n 14379 | 2023-05-21 02:46:51 | MASTER-SAAO | (06h 31m 33.57s , -80d 28m 38.6s) | C | 180 | 18.9 |\n 14379 | 2023-05-21 02:46:51 | MASTER-SAAO | (06h 36m 34.45s , -80d 29m 45.3s) | C | 180 | 19.0 |\n 14565 | 2023-05-21 02:49:57 | MASTER-OAFA | (07h 37m 13.81s , -68d 49m 42.8s) | C | 180 | 18.5 |\n 14765 | 2023-05-21 02:53:16 | MASTER-OAFA | (07h 59m 36.92s , -68d 48m 16.3s) | C | 180 | 18.5 |\n 14800 | 2023-05-21 02:53:51 | MASTER-SAAO | (06h 43m 35.73s , -78d 33m 54.7s) | C | 180 | 18.9 |\n 14800 | 2023-05-21 02:53:51 | MASTER-SAAO | (06h 47m 46.68s , -78d 35m 06.8s) | C | 180 | 19.0 |\n 14964 | 2023-05-21 02:56:36 | MASTER-OAFA | (08h 19m 53.79s , -68d 47m 37.1s) | C | 180 | 18.6 |\n 15164 | 2023-05-21 02:59:55 | MASTER-OAFA | (08h 42m 11.96s , -68d 47m 48.8s) | C | 180 | 18.6 |\n 15221 | 2023-05-21 03:00:52 | MASTER-SAAO | (06h 36m 37.64s , -80d 29m 08.2s) | C | 180 | 18.9 |\n 15221 | 2023-05-21 03:00:52 | MASTER-SAAO | (06h 31m 36.07s , -80d 27m 59.8s) | C | 180 | 18.9 |\n 15367 | 2023-05-21 03:03:18 | MASTER-OAFA | (07h 37m 14.15s , -68d 49m 34.5s) | C | 180 | 17.8 |\n 15644 | 2023-05-21 03:07:55 | MASTER-SAAO | (06h 47m 50.93s , -78d 34m 38.5s) | C | 180 | 19.1 |\n 15644 | 2023-05-21 03:07:55 | MASTER-SAAO | (06h 43m 40.04s , -78d 33m 25.9s) | C | 180 | 19.0 |\n 15673 | 2023-05-21 03:08:25 | MASTER-OAFA | (07h 06m 37.87s , -56d 00m 32.8s) | C | 180 | 12.2 |\n 15729 | 2023-05-21 03:09:20 | MASTER-OAFA | (07h 18m 32.80s , -55d 33m 21.2s) | C | 180 | 17.9 |\n 15855 | 2023-05-21 03:11:26 | MASTER-SAAO | (06h 32m 32.51s , -74d 48m 33.7s) | C | 180 | 18.7 |\n 15855 | 2023-05-21 03:11:26 | MASTER-SAAO | (06h 29m 23.66s , -74d 47m 15.4s) | C | 180 | 18.6 |\n 16065 | 2023-05-21 03:14:57 | MASTER-SAAO | (07h 02m 54.54s , -74d 45m 04.4s) | C | 180 | 18.4 |\n 16065 | 2023-05-21 03:14:57 | MASTER-SAAO | (06h 59m 46.80s , -74d 43m 45.2s) | C | 180 | 18.4 |\n 16097 | 2023-05-21 03:15:29 | MASTER-OAFA | (07h 45m 38.65s , -55d 32m 08.0s) | C | 180 | 18.0 |\n 16275 | 2023-05-21 03:18:27 | MASTER-SAAO | (06h 41m 30.23s , -72d 52m 29.0s) | C | 180 | 18.4 |\n 16275 | 2023-05-21 03:18:27 | MASTER-SAAO | (06h 38m 42.80s , -72d 51m 07.5s) | C | 180 | 18.4 |\n 16487 | 2023-05-21 03:21:58 | MASTER-SAAO | (07h 08m 31.83s , -72d 51m 44.5s) | C | 180 | 18.4 |\n 16487 | 2023-05-21 03:21:58 | MASTER-SAAO | (07h 05m 44.70s , -72d 50m 22.0s) | C | 180 | 18.4 |\n 16616 | 2023-05-21 03:24:08 | MASTER-OAFA | (07h 04m 07.45s , -55d 33m 45.8s) | C | 180 | 17.8 |\n 16699 | 2023-05-21 03:25:30 | MASTER-SAAO | (06h 32m 27.34s , -74d 47m 00.7s) | C | 180 | 18.7 |\n 16699 | 2023-05-21 03:25:30 | MASTER-SAAO | (06h 29m 18.81s , -74d 45m 39.8s) | C | 180 | 18.6 |\n 16910 | 2023-05-21 03:29:02 | MASTER-SAAO | (07h 03m 00.05s , -74d 46m 16.6s) | C | 180 | 18.6 |\n 16910 | 2023-05-21 03:29:02 | MASTER-SAAO | (06h 59m 51.99s , -74d 44m 55.2s) | C | 180 | 18.6 |\n 17033 | 2023-05-21 03:31:04 | MASTER-OAFA | (07h 45m 37.84s , -55d 33m 06.2s) | C | 180 | 17.9 |\n 17121 | 2023-05-21 03:32:33 | MASTER-SAAO | (06h 41m 24.73s , -72d 54m 41.5s) | C | 180 | 18.6 |\n 17121 | 2023-05-21 03:32:33 | MASTER-SAAO | (06h 38m 36.88s , -72d 53m 18.2s) | C | 180 | 18.4 |\n 17333 | 2023-05-21 03:36:04 | MASTER-SAAO | (07h 08m 38.79s , -72d 52m 39.3s) | C | 180 | 18.4 |\n 17333 | 2023-05-21 03:36:04 | MASTER-SAAO | (07h 05m 51.48s , -72d 51m 15.8s) | C | 180 | 18.4 |\n 17544 | 2023-05-21 03:39:35 | MASTER-SAAO | (17h 51m 57.07s , -86d 10m 46.5s) | C | 180 | 19.0 |\n 17544 | 2023-05-21 03:39:35 | MASTER-SAAO | (18h 04m 35.92s , -86d 12m 56.9s) | C | 180 | 19.1 |\n 17558 | 2023-05-21 03:39:49 | MASTER-OAFA | (07h 19m 34.31s , -44d 11m 10.4s) | C | 180 | 16.6 |\n 17965 | 2023-05-21 03:46:37 | MASTER-SAAO | (20h 32m 10.54s , -88d 12m 05.7s) | C | 180 | 18.9 |\n 18029 | 2023-05-21 03:47:41 | MASTER-OAFA | (08h 00m 29.96s , -66d 54m 10.0s) | C | 180 | 18.0 |\n 18290 | 2023-05-21 03:52:02 | MASTER-OAFA | (06h 57m 39.69s , -69d 19m 39.8s) | C | 180 | 13.1 |\n 18403 | 2023-05-21 03:53:54 | MASTER-SAAO | (17h 51m 57.78s , -86d 10m 40.1s) | C | 180 | 19.4 |\n 18403 | 2023-05-21 03:53:54 | MASTER-SAAO | (18h 04m 29.07s , -86d 12m 36.0s) | C | 180 | 19.3 |\n 18522 | 2023-05-21 03:55:54 | MASTER-OAFA | (07h 16m 35.59s , -68d 48m 37.6s) | C | 180 | 17.6 |\n 18824 | 2023-05-21 04:00:55 | MASTER-SAAO | (20h 31m 46.36s , -88d 11m 55.2s) | C | 180 | 19.1 |\n 18950 | 2023-05-21 04:03:01 | MASTER-OAFA | (08h 00m 39.99s , -65d 21m 16.4s) | C | 180 | 13.1 |\n 19054 | 2023-05-21 04:04:46 | MASTER-OAFA | (06h 57m 49.16s , -69d 20m 53.3s) | C | 180 | 12.8 |\n 19269 | 2023-05-21 04:08:21 | MASTER-SAAO | (13h 33m 27.03s , -87d 51m 06.2s) | C | 180 | 18.5 |\n 19269 | 2023-05-21 04:08:21 | MASTER-SAAO | (13h 11m 45.32s , -87d 49m 15.4s) | C | 180 | 18.7 |\n 19484 | 2023-05-21 04:11:55 | MASTER-SAAO | (16h 51m 35.47s , -87d 58m 06.7s) | C | 180 | 19.0 |\n 19484 | 2023-05-21 04:11:55 | MASTER-SAAO | (17h 15m 05.15s , -88d 00m 36.4s) | C | 180 | 18.7 |\n 19567 | 2023-05-21 04:13:19 | MASTER-OAFA | (07h 04m 49.77s , -67d 25m 14.5s) | C | 180 | 12.6 |\n 19696 | 2023-05-21 04:15:28 | MASTER-SAAO | (14h 09m 58.72s , -85d 57m 09.4s) | C | 180 | 18.4 |\n 19696 | 2023-05-21 04:15:28 | MASTER-SAAO | (14h 21m 45.31s , -85d 59m 16.4s) | C | 180 | 18.3 |\n 19824 | 2023-05-21 04:17:36 | MASTER-OAFA | (07h 20m 52.23s , -66d 54m 31.8s) | C | 180 | 17.9 |\n 19907 | 2023-05-21 04:18:58 | MASTER-SAAO | (16h 05m 08.96s , -86d 01m 58.6s) | C | 180 | 18.0 |\n 19907 | 2023-05-21 04:18:58 | MASTER-SAAO | (16h 17m 16.81s , -86d 03m 26.9s) | C | 180 | 18.1 |\n 20125 | 2023-05-21 04:22:37 | MASTER-SAAO | (13h 12m 28.10s , -87d 48m 55.9s) | C | 180 | 17.8 |\n 20125 | 2023-05-21 04:22:37 | MASTER-SAAO | (13h 34m 10.00s , -87d 50m 49.4s) | C | 180 | 17.6 |\n 20338 | 2023-05-21 04:26:10 | MASTER-OAFA | (07h 29m 02.19s , -63d 08m 33.6s) | C | 180 | 17.5 |\n 20340 | 2023-05-21 04:26:11 | MASTER-SAAO | (16h 51m 32.25s , -87d 59m 28.2s) | C | 180 | 17.6 |\n 20340 | 2023-05-21 04:26:11 | MASTER-SAAO | (17h 15m 23.24s , -88d 01m 56.5s) | C | 180 | 17.6 |\n 20552 | 2023-05-21 04:29:44 | MASTER-SAAO | (14h 10m 31.01s , -85d 55m 17.0s) | C | 180 | 16.7 |\n 20552 | 2023-05-21 04:29:44 | MASTER-SAAO | (14h 22m 12.45s , -85d 57m 04.2s) | C | 180 | 16.6 |\n 20763 | 2023-05-21 04:33:15 | MASTER-SAAO | (16h 17m 23.05s , -86d 02m 04.2s) | C | 180 | 15.3 |\n 20763 | 2023-05-21 04:33:15 | MASTER-SAAO | (16h 05m 19.79s , -86d 00m 40.1s) | C | 180 | 15.6 |\n 20855 | 2023-05-21 04:34:46 | MASTER-OAFA | (07h 20m 48.38s , -66d 53m 19.6s) | C | 180 | 17.4 |\n 22402 | 2023-05-21 05:00:34 | MASTER-OAFA | (08h 02m 56.47s , -63d 05m 49.6s) | C | 180 | 15.1 |\n 23439 | 2023-05-21 05:17:50 | MASTER-OAFA | (08h 02m 46.63s , -63d 05m 01.7s) | C | 180 | 17.0 |\n 23954 | 2023-05-21 05:26:25 | MASTER-OAFA | (08h 01m 13.74s , -64d 59m 35.7s) | C | 180 | 17.4 |\n 24471 | 2023-05-21 05:35:03 | MASTER-OAFA | (07h 20m 44.64s , -59d 18m 00.1s) | C | 180 | 16.5 |\n 24988 | 2023-05-21 05:43:40 | MASTER-OAFA | (08h 01m 06.52s , -64d 59m 29.2s) | C | 180 | 17.0 |\n 25512 | 2023-05-21 05:52:24 | MASTER-OAFA | (07h 50m 55.10s , -59d 19m 04.5s) | C | 180 | 16.3 |\n 26033 | 2023-05-21 06:01:04 | MASTER-OAFA | (07h 47m 43.04s , -61d 12m 08.1s) | C | 180 | 16.7 |\n 26552 | 2023-05-21 06:09:43 | MASTER-OAFA | (08h 38m 58.79s , -66d 51m 08.0s) | C | 180 | 17.2 |\n 27069 | 2023-05-21 06:18:21 | MASTER-OAFA | (08h 37m 16.49s , -64d 56m 35.3s) | C | 180 | 17.0 |\n 27595 | 2023-05-21 06:27:06 | MASTER-OAFA | (08h 18m 04.88s , -66d 49m 32.4s) | C | 180 | 17.0 |\n 28861 | 2023-05-21 06:48:13 | MASTER-OAFA | (08h 18m 24.75s , -63d 02m 47.5s) | C | 180 | 17.0 |\n 63971 | 2023-05-21 16:33:22 | MASTER-SAAO | (08h 34m 41.70s , -04d 01m 25.6s) | C | 180 | 15.7 |\n 64151 | 2023-05-21 16:33:22 | MASTER-SAAO | (08h 34m 41.68s , -04d 01m 25.8s) | C | 540 | 17.2 | Coadd\n 63971 | 2023-05-21 16:33:22 | MASTER-SAAO | (08h 35m 30.89s , -04d 01m 36.8s) | B | 180 | 16.1 |\n 64151 | 2023-05-21 16:33:22 | MASTER-SAAO | (08h 35m 30.87s , -04d 01m 37.1s) | B | 540 | 18.9 | Coadd\n 64192 | 2023-05-21 16:37:04 | MASTER-SAAO | (08h 34m 48.85s , -04d 02m 17.6s) | C | 180 | 13.2 |\n 64192 | 2023-05-21 16:37:04 | MASTER-SAAO | (08h 35m 37.95s , -04d 02m 32.5s) | C | 180 | 13.0 |\n 64986 | 2023-05-21 16:50:18 | MASTER-SAAO | (08h 34m 41.76s , -04d 01m 49.6s) | C | 180 | 17.5 |\n 64986 | 2023-05-21 16:50:18 | MASTER-SAAO | (08h 35m 31.24s , -04d 02m 01.3s) | B | 180 | 17.7 |\n 65198 | 2023-05-21 16:53:49 | MASTER-SAAO | (08h 34m 42.58s , -04d 00m 40.3s) | C | 180 | 18.8 |\n 65198 | 2023-05-21 16:53:49 | MASTER-SAAO | (08h 35m 31.61s , -04d 00m 57.3s) | C | 180 | 18.8 |\n 74450 | 2023-05-21 19:28:01 | MASTER-SAAO | (08h 28m 46.76s , -74d 38m 09.2s) | C | 180 | 17.4 |\n 74450 | 2023-05-21 19:28:01 | MASTER-SAAO | (08h 25m 43.31s , -74d 38m 33.7s) | C | 180 | 17.4 |\n 74676 | 2023-05-21 19:31:47 | MASTER-SAAO | (08h 56m 12.94s , -74d 39m 45.9s) | C | 180 | 14.1 |\n 74676 | 2023-05-21 19:31:47 | MASTER-SAAO | (08h 59m 16.70s , -74d 39m 39.2s) | C | 180 | 14.1 |\n 75514 | 2023-05-21 19:45:46 | MASTER-SAAO | (08h 28m 46.23s , -74d 37m 22.5s) | C | 180 | 13.4 |\n 75514 | 2023-05-21 19:45:46 | MASTER-SAAO | (08h 25m 43.70s , -74d 37m 50.7s) | C | 180 | 13.5 |\n 75726 | 2023-05-21 19:49:18 | MASTER-SAAO | (08h 56m 12.16s , -74d 39m 10.2s) | C | 180 | 14.7 |\n 75726 | 2023-05-21 19:49:18 | MASTER-SAAO | (08h 59m 15.50s , -74d 38m 44.2s) | C | 180 | 14.7 |\n 76567 | 2023-05-21 20:03:18 | MASTER-SAAO | (08h 30m 24.20s , -76d 32m 12.0s) | C | 180 | 14.8 |\n 76567 | 2023-05-21 20:03:18 | MASTER-SAAO | (08h 33m 52.05s , -76d 31m 47.8s) | C | 180 | 14.5 |\n 76863 | 2023-05-21 20:08:15 | MASTER-SAAO | (09h 05m 03.30s , -76d 32m 33.5s) | C | 180 | 17.0 |\n 76863 | 2023-05-21 20:08:15 | MASTER-SAAO | (09h 08m 33.56s , -76d 32m 55.2s) | C | 180 | 17.0 |\n 77076 | 2023-05-21 20:11:48 | MASTER-SAAO | (08h 25m 21.20s , -72d 45m 47.4s) | C | 180 | 16.3 |\n 77076 | 2023-05-21 20:11:48 | MASTER-SAAO | (08h 22m 37.32s , -72d 44m 30.0s) | C | 180 | 15.9 |\n 77384 | 2023-05-21 20:16:55 | MASTER-SAAO | (08h 49m 39.44s , -72d 44m 56.2s) | C | 180 | 16.7 |\n 77384 | 2023-05-21 20:16:55 | MASTER-SAAO | (08h 52m 23.99s , -72d 45m 41.2s) | C | 180 | 16.9 |\n 77583 | 2023-05-21 20:20:15 | MASTER-SAAO | (08h 30m 28.71s , -76d 30m 54.0s) | C | 180 | 15.7 |\n 77583 | 2023-05-21 20:20:15 | MASTER-SAAO | (08h 33m 57.31s , -76d 31m 51.1s) | C | 180 | 16.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-21T20:30:59.557984Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-21T20:30:59.558004Z",
"modified": "2023-05-21T20:30:59.565317Z",
"nonlocalizedevents": [
{
"event_id": "S230520a"
}
],
"targets": []
},
{
"id": 34,
"topic": "gcn.circular",
"uuid": "71dc96d9-74df-4303-9a1e-dcd4d19e702f",
"title": "Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"data": {
"date": "23/05/22 00:19:06 GMT",
"from": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"title": "GCN CIRCULAR",
"number": "33846",
"subject": "Fermi Gamma-ray Burst Monitor trigger 706338208/230521211 is not a GRB"
},
"message_text": "S. Lesage (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 706338208/230521211 at\n05:03:23 UT\non 21 May 2023, tentatively classified as GRB 230521A (GCN 33839), is in\nfact not due\nto a GRB. This trigger is likely due to Uncertain.\"\n\n",
"published": "2023-05-22T00:19:16.279253Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T00:19:16.279275Z",
"modified": "2023-05-22T00:19:16.286248Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 37,
"topic": "gcn.circular",
"uuid": "32f3a4e3-8169-41bf-a1de-a8f83c35ac5c",
"title": "GRB 230518B: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/05/22 03:38:03 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "33847",
"subject": "GRB 230518B: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 230518B (Fermi/GBM detection: trigger no. 706068974 initially classified as a GRB; INTEGRAL/SPI-ACS peak detection at 2023-05-18 02:18:15 UT) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2023-05-18 02:18:17 UTC. The T90 duration measured by VZLUSAT-2 is 138 s and the significance during T90 reaches 33 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230518B_GCN_VZLUSAT2.pdf\n\nThe event was re-evaluated by the Fermi/GBM team (J. Wood, GCN Circ. 33821) to be likely due to local particles. The Fermi satellite was at the GBM trigger time 2023-05-18 02:16:09.41 UT at longitude = 24.33 deg, latitude = -24.43 deg. The VZLUSAT-2 satellite was at that time at longitude = 109.9 deg, latitude = -28.4 deg. Since this event was detected by three satellites at different locations, we believe this event is of astrophysical origin and possibly a long-duration GRB.\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n",
"published": "2023-05-22T03:38:11.781519Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T03:38:11.781547Z",
"modified": "2023-05-22T03:38:11.787562Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 38,
"topic": "gcn.circular",
"uuid": "254d95e8-0b06-46c2-8ec6-8e4de0aa4fc7",
"title": "# LIGO/Virgo/KAGRA S230521k: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Tomas Ahumada at U. of Maryland <tahumada@astro.umd.edu>",
"data": {
"date": "23/05/22 04:35:25 GMT",
"from": "Tomas Ahumada at U. of Maryland <tahumada@astro.umd.edu>",
"title": "GCN CIRCULAR",
"number": "33848",
"subject": "# LIGO/Virgo/KAGRA S230521k: Zwicky Transient Facility observations"
},
"message_text": "Tomas Ahumada (CIT), Viraj Karambelkar (CIT), Robert Stein (CIT), Gaurav\nWaratkar (IITB), Anirudh Salgundi (IITB), Theophile du Laz (CIT), Igor\nAndreoni (UMD), Michael Coughlin (UMN), Mansi Kasliwal (CIT), Varun\nBhalerao (IITB), Simeon Reusch (DESY), Jannis Necker (DESY), Shreya Anand\n(CIT), report on behalf of the ZTF and GROWTH collaborations:\n\n\nWe serendipitously observed the localization region of LVC trigger S230521k\nas part of routine Zwicky Transient Facility (ZTF; Graham et al., 2019;\nBellm et al., 2019) survey operations. We obtained a total of 100 images\ncovering g, r, and i bands for a total of 3810 seconds. These serendipitous\nobservations covered 1238.8 square degrees beginning at 2023-05-21T05:32:51\n(2 minutes after the burst trigger time) corresponding to ~9% of the\nprobability enclosed in the localization region.\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through\nFritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep), and\nAMPEL (Nordin et al. 2019). We required at least 2 detections separated by\nat least 15 minutes to select against moving objects. Furthermore, we\ncross-match our candidates with the Minor Planet Center to flag known\nasteroids, reject stellar sources (Tachibana and Miller 2018), and apply\nmachine learning algorithms (Mahabal et al. 2019). We require that no\nspatially coincident ZTF alerts were issued before the detection time of\nthe LVC trigger.\n\nTwo sources passed our criteria and were inside the 95% error region:\n\n|-----------------------------------------------------------------------------------------------------\n| id | alias | ra | dec | mjd |\nmag±err (ab) | filter |\n|-----------------------------------------------------------------------------------------------------\n| ZTF23aaladzz | AT2023jcp | 275.9841 | 24.9580 | 60085.36780 |\n20.18±0.17 | r |\n| ZTF23aaladoy | AT2016bqh/AT 2023jbu | 280.1828 | 27.0236 | 60085.36780 |\n15.56±0.03 | g |\n|-----------------------------------------------------------------------------------------------------\n\n\nForced photometry at the location of AT2023jcp detections 4 days prior to\nthe GW event merger time. Thus, we rule out this source as a candidate\ncounterpart. A source 0.1 arcsec from ZTF23aaladoy was previously reported\nto TNS in 2016, thus we rule it out as a viable candidate.\n\nFurther follow-up of this localization region will continue as part of\nregular survey operations.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,\nUSA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,\nGermany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;\nIITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.\nZTF acknowledges the generous support of the NSF under AST MSIP Grant No\n1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant\nNo 1545949. Alert distribution service provided by DIRAC@UW (Patterson et\nal. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019)\nand Kowalski (Duev et al. 2019). GROWTH India telescope is located at the\nIndian Astronomical Observatory (Hanle), operated by the Indian Institute\nof Astrophysics (IIA). GROWTH-India project is supported by SERB and\nadministered by IUSSTF, under grant number IUSSTF/PIRE\nProgram/GROWTH/2015-16 and IUCAA.\n\n",
"published": "2023-05-22T04:35:33.463115Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T04:35:33.463138Z",
"modified": "2023-05-22T04:35:33.469802Z",
"nonlocalizedevents": [
{
"event_id": "S230521k"
}
],
"targets": []
},
{
"id": 39,
"topic": "gcn.circular",
"uuid": "6c6815da-c3b5-4646-9b92-7a1651440d9d",
"title": "LIGO/Virgo S230521k: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/22 06:24:36 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33849",
"subject": "LIGO/Virgo S230521k: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230521k errorbox 27825 sec after trigger time at 2023-05-21 13:14:28 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 47 deg. The sun altitude is -14.0 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230521k errorbox 40364 sec after trigger time at 2023-05-21 16:43:27 UT, with upper limit up to 18.8 mag. Observations started at twilight. The observations began at zenith distance = 43 deg. The sun altitude is -12.2 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230521k errorbox 62011 sec after trigger time at 2023-05-21 22:44:14 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 22 deg. The sun altitude is -12.9 deg.\n\nThe galactic latitude b = -49 deg., longitude l = 208 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011874\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 27856 | 2023-05-21 13:14:28 | MASTER-Amur | (05h 16m 51.62s , +79d 09m 34.2s) | C | 60 | 17.0 |\n 27948 | 2023-05-21 13:16:01 | MASTER-Amur | (05h 58m 39.99s , +79d 09m 12.5s) | C | 60 | 16.9 |\n 28226 | 2023-05-21 13:20:38 | MASTER-Amur | (05h 16m 51.13s , +79d 10m 54.0s) | C | 60 | 17.0 |\n 28318 | 2023-05-21 13:22:11 | MASTER-Amur | (05h 58m 42.66s , +79d 09m 35.7s) | C | 60 | 17.0 |\n 28596 | 2023-05-21 13:26:49 | MASTER-Amur | (05h 17m 00.94s , +79d 10m 40.8s) | C | 60 | 17.1 |\n 28689 | 2023-05-21 13:28:21 | MASTER-Amur | (05h 58m 50.00s , +79d 09m 27.3s) | C | 60 | 17.1 |\n 28782 | 2023-05-21 13:29:54 | MASTER-Amur | (03h 57m 11.24s , +79d 16m 57.1s) | C | 60 | 17.1 |\n 28874 | 2023-05-21 13:31:26 | MASTER-Amur | (04h 39m 13.24s , +79d 13m 50.0s) | C | 60 | 17.2 |\n 28966 | 2023-05-21 13:32:59 | MASTER-Amur | (04h 23m 33.68s , +73d 32m 50.4s) | C | 60 | 16.9 |\n 29059 | 2023-05-21 13:34:31 | MASTER-Amur | (04h 51m 21.32s , +73d 30m 10.9s) | C | 60 | 17.0 |\n 29152 | 2023-05-21 13:36:04 | MASTER-Amur | (03h 57m 11.88s , +79d 15m 51.5s) | C | 60 | 17.1 |\n 29244 | 2023-05-21 13:37:37 | MASTER-Amur | (04h 39m 21.54s , +79d 14m 59.3s) | C | 60 | 17.3 |\n 29337 | 2023-05-21 13:39:09 | MASTER-Amur | (04h 23m 31.37s , +73d 32m 22.5s) | C | 60 | 17.0 |\n 29429 | 2023-05-21 13:40:42 | MASTER-Amur | (04h 51m 29.46s , +73d 32m 16.9s) | C | 60 | 17.0 |\n 29614 | 2023-05-21 13:43:46 | MASTER-Amur | (04h 39m 21.10s , +79d 15m 35.2s) | C | 60 | 17.3 |\n 29706 | 2023-05-21 13:45:19 | MASTER-Amur | (04h 23m 36.18s , +73d 33m 35.9s) | C | 60 | 17.0 |\n 29799 | 2023-05-21 13:46:51 | MASTER-Amur | (04h 51m 25.07s , +73d 30m 56.3s) | C | 60 | 16.9 |\n 40149 | 2023-05-21 16:38:22 | MASTER-Amur | (02h 10m 05.21s , +37d 24m 21.1s) | C | 180 | 13.8 |\n 40454 | 2023-05-21 16:43:27 | MASTER-SAAO | (06h 48m 54.11s , -23d 27m 13.1s) | C | 180 | 16.9 |\n 40454 | 2023-05-21 16:43:27 | MASTER-SAAO | (06h 49m 48.06s , -23d 27m 33.7s) | C | 180 | 16.9 |\n 40666 | 2023-05-21 16:46:58 | MASTER-SAAO | (06h 57m 40.41s , -23d 25m 39.2s) | C | 180 | 17.9 |\n 40666 | 2023-05-21 16:46:58 | MASTER-SAAO | (06h 58m 34.32s , -23d 25m 59.9s) | C | 180 | 17.9 |\n 41459 | 2023-05-21 17:00:12 | MASTER-SAAO | (06h 48m 53.99s , -23d 26m 32.0s) | C | 180 | 18.6 |\n 41459 | 2023-05-21 17:00:12 | MASTER-SAAO | (06h 49m 47.04s , -23d 26m 55.3s) | C | 180 | 18.6 |\n 41659 | 2023-05-21 17:03:32 | MASTER-SAAO | (06h 57m 35.46s , -23d 25m 04.7s) | C | 180 | 17.9 |\n 41659 | 2023-05-21 17:03:32 | MASTER-SAAO | (06h 58m 28.60s , -23d 25m 28.6s) | C | 180 | 18.0 |\n 41870 | 2023-05-21 17:07:03 | MASTER-SAAO | (06h 26m 51.52s , -21d 30m 59.3s) | C | 180 | 15.9 |\n 41870 | 2023-05-21 17:07:03 | MASTER-SAAO | (06h 27m 43.67s , -21d 31m 23.1s) | C | 180 | 16.0 |\n 41889 | 2023-05-21 17:07:22 | MASTER-Amur | (02h 06m 58.70s , +35d 30m 02.6s) | C | 180 | 15.7 |\n 42082 | 2023-05-21 17:10:34 | MASTER-SAAO | (06h 35m 22.00s , -21d 31m 29.0s) | C | 180 | 16.3 |\n 42082 | 2023-05-21 17:10:34 | MASTER-SAAO | (06h 36m 14.42s , -21d 31m 51.9s) | C | 180 | 16.4 |\n 42102 | 2023-05-21 17:10:54 | MASTER-Amur | (02h 04m 11.90s , +33d 37m 56.1s) | C | 180 | 15.6 |\n 42293 | 2023-05-21 17:14:06 | MASTER-SAAO | (06h 22m 52.17s , -19d 37m 43.5s) | C | 180 | 14.8 |\n 42293 | 2023-05-21 17:14:06 | MASTER-SAAO | (06h 22m 00.55s , -19d 37m 20.1s) | C | 180 | 14.8 |\n 42315 | 2023-05-21 17:14:27 | MASTER-Amur | (01h 09m 27.15s , +33d 36m 33.2s) | C | 180 | 17.0 |\n 42505 | 2023-05-21 17:17:38 | MASTER-SAAO | (06h 30m 24.34s , -19d 38m 13.1s) | C | 180 | 16.1 |\n 42505 | 2023-05-21 17:17:38 | MASTER-SAAO | (06h 31m 16.05s , -19d 38m 35.3s) | C | 180 | 16.0 |\n 42527 | 2023-05-21 17:17:59 | MASTER-Amur | (01h 19m 00.90s , +33d 37m 40.4s) | C | 180 | 16.7 |\n 42716 | 2023-05-21 17:21:09 | MASTER-SAAO | (06h 26m 51.61s , -21d 31m 47.3s) | C | 180 | 18.0 |\n 42716 | 2023-05-21 17:21:09 | MASTER-SAAO | (06h 27m 43.67s , -21d 32m 10.0s) | C | 180 | 18.0 |\n 42927 | 2023-05-21 17:24:40 | MASTER-SAAO | (06h 35m 24.28s , -21d 30m 07.4s) | C | 180 | 18.8 |\n 42927 | 2023-05-21 17:24:40 | MASTER-SAAO | (06h 36m 16.24s , -21d 30m 30.7s) | C | 180 | 18.7 |\n 42993 | 2023-05-21 17:25:46 | MASTER-Amur | (02h 01m 42.41s , +31d 42m 14.7s) | C | 180 | 15.6 |\n 43139 | 2023-05-21 17:28:11 | MASTER-SAAO | (06h 21m 58.47s , -19d 37m 36.1s) | C | 180 | 17.8 |\n 43139 | 2023-05-21 17:28:11 | MASTER-SAAO | (06h 22m 49.47s , -19d 37m 59.6s) | C | 180 | 17.9 |\n 43206 | 2023-05-21 17:29:18 | MASTER-Amur | (01h 09m 26.22s , +33d 36m 20.9s) | C | 180 | 17.1 |\n 43351 | 2023-05-21 17:31:43 | MASTER-SAAO | (06h 30m 31.97s , -19d 35m 53.9s) | C | 180 | 18.0 |\n 43351 | 2023-05-21 17:31:43 | MASTER-SAAO | (06h 31m 22.88s , -19d 36m 17.9s) | C | 180 | 18.0 |\n 43562 | 2023-05-21 17:35:15 | MASTER-SAAO | (06h 17m 39.15s , -17d 41m 33.1s) | C | 180 | 17.2 |\n 43562 | 2023-05-21 17:35:15 | MASTER-SAAO | (06h 18m 28.85s , -17d 41m 55.5s) | C | 180 | 17.5 |\n 43774 | 2023-05-21 17:38:46 | MASTER-SAAO | (06h 26m 08.53s , -17d 42m 25.2s) | C | 180 | 18.3 |\n 43774 | 2023-05-21 17:38:46 | MASTER-SAAO | (06h 26m 58.19s , -17d 42m 47.2s) | C | 180 | 18.4 |\n 43985 | 2023-05-21 17:42:18 | MASTER-SAAO | (06h 33m 41.65s , -17d 43m 16.4s) | C | 180 | 18.3 |\n 43985 | 2023-05-21 17:42:18 | MASTER-SAAO | (06h 34m 31.33s , -17d 43m 38.4s) | C | 180 | 18.3 |\n 44197 | 2023-05-21 17:45:50 | MASTER-SAAO | (06h 38m 11.33s , -25d 18m 49.8s) | C | 180 | 18.7 |\n 44197 | 2023-05-21 17:45:50 | MASTER-SAAO | (06h 39m 03.83s , -25d 19m 12.2s) | C | 180 | 18.6 |\n 44408 | 2023-05-21 17:49:21 | MASTER-SAAO | (06h 42m 06.33s , -17d 41m 17.3s) | C | 180 | 18.6 |\n 44408 | 2023-05-21 17:49:21 | MASTER-SAAO | (06h 42m 55.91s , -17d 41m 40.2s) | C | 180 | 18.5 |\n 44620 | 2023-05-21 17:52:52 | MASTER-SAAO | (06h 17m 45.89s , -17d 42m 04.2s) | C | 180 | 15.9 |\n 44620 | 2023-05-21 17:52:52 | MASTER-SAAO | (06h 18m 35.18s , -17d 42m 24.6s) | C | 180 | 15.9 |\n 44786 | 2023-05-21 17:55:38 | MASTER-Amur | (01h 18m 55.53s , +33d 37m 43.3s) | C | 180 | 16.3 |\n 44831 | 2023-05-21 17:56:24 | MASTER-SAAO | (06h 47m 00.40s , -25d 17m 00.9s) | C | 180 | 17.5 |\n 44831 | 2023-05-21 17:56:24 | MASTER-SAAO | (06h 47m 53.06s , -25d 17m 19.3s) | C | 180 | 17.5 |\n 44998 | 2023-05-21 17:59:11 | MASTER-Amur | (02h 01m 40.50s , +31d 42m 16.9s) | C | 180 | 14.6 |\n 45043 | 2023-05-21 17:59:55 | MASTER-SAAO | (06h 26m 14.74s , -17d 41m 51.2s) | C | 180 | 16.4 |\n 45043 | 2023-05-21 17:59:55 | MASTER-SAAO | (06h 27m 04.14s , -17d 42m 09.5s) | C | 180 | 16.5 |\n 45254 | 2023-05-21 18:03:27 | MASTER-SAAO | (06h 33m 41.02s , -17d 42m 41.9s) | C | 180 | 17.5 |\n 45254 | 2023-05-21 18:03:27 | MASTER-SAAO | (06h 34m 30.36s , -17d 43m 00.0s) | C | 180 | 17.7 |\n 45424 | 2023-05-21 18:06:16 | MASTER-Amur | (00h 58m 28.35s , +29d 49m 36.4s) | C | 180 | 15.8 |\n 45466 | 2023-05-21 18:06:59 | MASTER-SAAO | (06h 38m 15.58s , -25d 18m 38.9s) | C | 180 | 18.4 |\n 45466 | 2023-05-21 18:06:59 | MASTER-SAAO | (06h 39m 07.70s , -25d 18m 57.2s) | C | 180 | 18.4 |\n 45678 | 2023-05-21 18:10:30 | MASTER-SAAO | (06h 42m 07.63s , -17d 40m 48.9s) | C | 180 | 16.4 |\n 45678 | 2023-05-21 18:10:30 | MASTER-SAAO | (06h 42m 56.97s , -17d 41m 07.6s) | C | 180 | 16.3 |\n 45890 | 2023-05-21 18:14:02 | MASTER-SAAO | (06h 47m 03.57s , -25d 18m 02.0s) | C | 180 | 12.9 |\n 45890 | 2023-05-21 18:14:02 | MASTER-SAAO | (06h 47m 56.19s , -25d 18m 19.7s) | C | 180 | 12.6 |\n 46101 | 2023-05-21 18:17:33 | MASTER-SAAO | (06h 38m 12.01s , -19d 35m 21.0s) | C | 180 | 15.5 |\n 46101 | 2023-05-21 18:17:33 | MASTER-SAAO | (06h 39m 02.34s , -19d 35m 37.4s) | C | 180 | 15.7 |\n 46312 | 2023-05-21 18:21:05 | MASTER-SAAO | (06h 46m 38.41s , -19d 34m 13.5s) | C | 180 | 16.5 |\n 46312 | 2023-05-21 18:21:05 | MASTER-SAAO | (06h 47m 28.72s , -19d 34m 29.8s) | C | 180 | 16.6 |\n 46524 | 2023-05-21 18:24:37 | MASTER-SAAO | (06h 29m 59.55s , -15d 48m 07.5s) | C | 180 | 14.1 |\n 46524 | 2023-05-21 18:24:37 | MASTER-SAAO | (06h 30m 48.27s , -15d 48m 23.0s) | C | 180 | 14.6 |\n 46735 | 2023-05-21 18:28:08 | MASTER-SAAO | (07h 00m 11.95s , -30d 58m 21.0s) | C | 180 | 15.3 |\n 46735 | 2023-05-21 18:28:08 | MASTER-SAAO | (07h 01m 07.76s , -30d 58m 35.3s) | C | 180 | 15.1 |\n 46946 | 2023-05-21 18:31:39 | MASTER-SAAO | (06h 39m 09.39s , -15d 47m 57.7s) | C | 180 | 12.9 |\n 47370 | 2023-05-21 18:38:43 | MASTER-SAAO | (07h 09m 30.09s , -30d 58m 51.6s) | C | 180 | 12.8 |\n 47370 | 2023-05-21 18:38:43 | MASTER-SAAO | (07h 10m 25.96s , -30d 59m 05.0s) | C | 180 | 12.7 |\n 47583 | 2023-05-21 18:42:15 | MASTER-SAAO | (06h 46m 48.88s , -19d 33m 36.9s) | C | 180 | 12.5 |\n 47583 | 2023-05-21 18:42:15 | MASTER-SAAO | (06h 47m 38.92s , -19d 33m 50.7s) | C | 180 | 12.7 |\n 48005 | 2023-05-21 18:49:18 | MASTER-SAAO | (07h 00m 09.31s , -30d 59m 36.1s) | C | 180 | 12.6 |\n 48005 | 2023-05-21 18:49:18 | MASTER-SAAO | (07h 01m 04.71s , -30d 59m 47.9s) | C | 180 | 12.5 |\n 49062 | 2023-05-21 19:06:54 | MASTER-SAAO | (06h 55m 17.36s , -25d 16m 02.4s) | C | 180 | 14.2 |\n 49062 | 2023-05-21 19:06:54 | MASTER-SAAO | (06h 56m 09.44s , -25d 16m 15.4s) | C | 180 | 14.5 |\n 49696 | 2023-05-21 19:17:28 | MASTER-SAAO | (06h 54m 04.28s , -27d 08m 59.0s) | C | 180 | 14.6 |\n 49696 | 2023-05-21 19:17:28 | MASTER-SAAO | (06h 54m 56.79s , -27d 09m 11.6s) | C | 180 | 15.0 |\n 49906 | 2023-05-21 19:20:59 | MASTER-SAAO | (06h 55m 21.35s , -25d 16m 21.8s) | C | 180 | 12.5 |\n 49906 | 2023-05-21 19:20:59 | MASTER-SAAO | (06h 56m 12.74s , -25d 16m 35.3s) | C | 180 | 14.0 |\n 50865 | 2023-05-21 19:36:58 | MASTER-SAAO | (07h 00m 22.45s , -34d 46m 05.4s) | C | 180 | 15.4 |\n 50865 | 2023-05-21 19:36:58 | MASTER-SAAO | (07h 01m 19.73s , -34d 46m 14.6s) | C | 180 | 15.6 |\n 51181 | 2023-05-21 19:42:13 | MASTER-SAAO | (07h 10m 03.83s , -34d 45m 12.5s) | C | 180 | 15.9 |\n 51181 | 2023-05-21 19:42:13 | MASTER-SAAO | (07h 11m 00.94s , -34d 45m 19.3s) | C | 180 | 16.0 |\n 51916 | 2023-05-21 19:54:28 | MASTER-SAAO | (07h 00m 31.27s , -34d 45m 43.8s) | C | 180 | 14.2 |\n 51916 | 2023-05-21 19:54:28 | MASTER-SAAO | (07h 01m 27.95s , -34d 45m 50.1s) | C | 180 | 14.4 |\n 52230 | 2023-05-21 19:59:43 | MASTER-SAAO | (07h 10m 11.06s , -34d 45m 33.0s) | C | 180 | 14.6 |\n 52230 | 2023-05-21 19:59:43 | MASTER-SAAO | (07h 11m 07.82s , -34d 45m 38.7s) | C | 180 | 14.7 |\n 62101 | 2023-05-21 22:44:14 | MASTER-OAFA | (08h 35m 34.70s , -43d 48m 12.2s) | C | 180 | 17.6 |\n 63185 | 2023-05-21 23:02:18 | MASTER-OAFA | (08h 35m 32.65s , -42d 30m 54.4s) | C | 180 | 17.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-22T06:24:45.727879Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T06:24:45.727912Z",
"modified": "2023-05-22T06:24:45.735910Z",
"nonlocalizedevents": [
{
"event_id": "S230521k"
}
],
"targets": []
},
{
"id": 45,
"topic": "gcn.circular",
"uuid": "40e0fe66-740f-4de1-b1c7-944d9285a0e7",
"title": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for MeerLICHT candidates: AT2023ixg and AT2023iyb",
"submitter": "Hop gcn.circular",
"authors": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"data": {
"date": "23/05/22 15:52:54 GMT",
"from": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33851",
"subject": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for MeerLICHT candidates: AT2023ixg and AT2023iyb"
},
"message_text": "A. A. Breeveld (UCL-MSSL), N. P. M. Kuin (UCL-MSSL), S. R. Oates (U. of Birmingham), P. Brown (TAMU), M. De Pasquale (U. Messina), C. Gronwall (PSU), N. Klingler (NASA-GSFC/UMBC/CRESST II), F. E. Marshall (NASA/GSFC), M. J. Page (UCL-MSSL), M. H. Siegel (PSU), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), S. Campana (INAF-OAB), S.B. Cenko (NASA/GSFC), A. DâAì (INAF-IASFPA), P. DâAvanzo (INAF-OAB), V. DâElia (ASI-SSDC & INAF-OAR), S. Dichiara (PSU), P.A. Evans (U. Leicester), R.A.J. Eyles-Ferris (U. Leicester), D. Hartmann (Clemson University), J.A. Kennea (PSU), S. Laha (NASA/GSFC), A.Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), J.A. Nousek (PSU), P. OâBrien (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), D. M. Palmer (LANL), S. Ronchini (PSU), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (U. Toronto) and E. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nWe report Swift/UVOT observations of the candidates AT2023ixg and AT2023iyb (Johnston et al., Astronote 2023-121) found by the the MeerLICHT 0.65m wide-field telescope during the search for the EM counterpart of the LVC event S230518h (LIGO/VIRGO/KAGRA Collaboration GCN Circ. 33813).\n\nSwift/UVOT observations of these MeerLICHT candidates began 73 hours after the LVK trigger (LIGO/VIRGO/KAGRA Collaboration, GCN Circ. 33813) in the UV filters. We do not detect either of the candidates in the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are:\n\nTarget Filter T_start(s) T_stop(s) Exp(s) 3sigUL\n\nAT2023ixg w1 267962 273767 164 18.4\n m2 267775 278324 1067 19.6\n w2 267587 278065 570 20.4\n\nAT2023iyb m2 265880 272062 507 19.9\n w2 265181 271869 1214 20.7\n\nThis circular is an official product of the Swift team.\n\n",
"published": "2023-05-22T15:53:06.275615Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T15:53:06.275638Z",
"modified": "2023-05-22T15:53:06.280512Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 46,
"topic": "gcn.circular",
"uuid": "42d09907-3199-422a-9e26-ffe0f11102a4",
"title": "LIGO/Virgo/KAGRA S230522n: Upper limits from IceCube neutrino search",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/05/22 16:25:52 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33852",
"subject": "LIGO/Virgo/KAGRA S230522n: Upper limits from IceCube neutrino search"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S230522n in a time range of 1000 seconds centered on the alert event time (2023-05-22 15:22:13.000 UTC to 2023-05-22 15:38:53.000 UTC) has been performed [1,2].\n\nDuring this time period IceCube was collecting good quality data. No significant track-like events are found in spatial coincidence of S230522n calculated from the map circulated in the 2-Preliminary notice.\n\nIceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of S230522n ranges from 0.028 to 1.133 GeV cm^-2 in a 1000 second time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n\n",
"published": "2023-05-22T16:26:01.252743Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-22T16:26:01.252763Z",
"modified": "2023-05-22T16:26:01.260226Z",
"nonlocalizedevents": [
{
"event_id": "S230522n"
}
],
"targets": []
},
{
"id": 47,
"topic": "gcn.circular",
"uuid": "08c88e1c-bbb8-4b37-8164-0decaa9a6f8b",
"title": "LIGO/Virgo S230522a: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/23 02:50:46 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33853",
"subject": "LIGO/Virgo S230522a: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230522a errorbox 16 sec after notice time and 58 sec after trigger time at 2023-05-22 09:39:03 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 65 deg. The sun altitude is -21.1 deg.\n\nMASTER-Amur robotic telescope located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230522a errorbox 11003 sec after notice time and 11044 sec after trigger time at 2023-05-22 12:42:09 UT, with upper limit up to 18.3 mag. Observations started at twilight. The observations began at zenith distance = 58 deg. The sun altitude is -10.8 deg.\n\nThe galactic latitude b = 5 deg., longitude l = 65 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011878\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 63 | 2023-05-22 09:39:03 | MASTER-OAFA | (19h 34m 48.88s , +30d 35m 13.5s) | C | 10 | 14.9 |\n 97 | 2023-05-22 09:39:32 | MASTER-OAFA | (19h 34m 55.42s , +30d 34m 12.8s) | C | 20 | 15.4 |\n 137 | 2023-05-22 09:40:12 | MASTER-OAFA | (19h 34m 49.64s , +30d 33m 11.4s) | C | 20 | 15.6 |\n 177 | 2023-05-22 09:40:12 | MASTER-OAFA | (19h 34m 49.64s , +30d 33m 11.6s) | C | 100 | 15.9 | Coadd\n 182 | 2023-05-22 09:40:51 | MASTER-OAFA | (19h 34m 56.49s , +30d 33m 17.5s) | C | 30 | 15.7 |\n 236 | 2023-05-22 09:41:41 | MASTER-OAFA | (19h 34m 52.51s , +30d 35m 03.1s) | C | 40 | 15.7 |\n 301 | 2023-05-22 09:42:40 | MASTER-OAFA | (19h 34m 52.47s , +30d 33m 32.0s) | C | 50 | 15.7 |\n 380 | 2023-05-22 09:43:49 | MASTER-OAFA | (19h 34m 55.75s , +30d 34m 56.6s) | C | 70 | 14.9 |\n 480 | 2023-05-22 09:45:19 | MASTER-OAFA | (19h 34m 50.29s , +30d 34m 01.5s) | C | 90 | 14.9 |\n 599 | 2023-05-22 09:47:09 | MASTER-OAFA | (19h 34m 49.49s , +30d 34m 57.5s) | C | 110 | 15.5 |\n 739 | 2023-05-22 09:49:19 | MASTER-OAFA | (19h 34m 55.24s , +30d 33m 52.2s) | C | 130 | 15.9 |\n 914 | 2023-05-22 09:51:48 | MASTER-OAFA | (18h 23m 08.96s , +24d 48m 15.6s) | C | 180 | 17.0 |\n 1113 | 2023-05-22 09:55:08 | MASTER-OAFA | (18h 23m 15.43s , +24d 48m 31.7s) | C | 180 | 17.0 |\n 1313 | 2023-05-22 09:58:27 | MASTER-OAFA | (18h 23m 12.21s , +24d 49m 34.8s) | C | 180 | 16.9 |\n 1513 | 2023-05-22 10:01:47 | MASTER-OAFA | (18h 23m 12.33s , +24d 48m 03.6s) | C | 180 | 17.2 |\n 1712 | 2023-05-22 10:05:06 | MASTER-OAFA | (18h 23m 14.90s , +24d 49m 35.1s) | C | 180 | 17.3 |\n 1912 | 2023-05-22 10:08:26 | MASTER-OAFA | (18h 23m 09.18s , +24d 48m 34.7s) | C | 180 | 17.3 |\n 2111 | 2023-05-22 10:11:45 | MASTER-OAFA | (18h 23m 10.28s , +24d 49m 27.3s) | C | 180 | 16.9 |\n 2310 | 2023-05-22 10:15:05 | MASTER-OAFA | (18h 23m 16.54s , +24d 48m 18.6s) | C | 180 | 16.9 |\n 2510 | 2023-05-22 10:18:24 | MASTER-OAFA | (18h 23m 09.79s , +24d 47m 10.3s) | C | 180 | 16.7 |\n 11074 | 2023-05-22 12:42:09 | MASTER-Amur | (13h 09m 08.87s , -07d 41m 16.2s) | C | 60 | 16.3 |\n 11167 | 2023-05-22 12:43:42 | MASTER-Amur | (13h 09m 15.69s , -07d 42m 26.4s) | C | 60 | 16.4 |\n 11260 | 2023-05-22 12:45:14 | MASTER-Amur | (13h 09m 09.88s , -07d 43m 33.6s) | C | 60 | 16.6 |\n 11412 | 2023-05-22 12:46:46 | MASTER-Amur | (18h 25m 35.96s , +25d 01m 34.0s) | C | 180 | 16.4 |\n 11624 | 2023-05-22 12:50:19 | MASTER-Amur | (18h 25m 34.01s , +25d 02m 58.8s) | C | 180 | 16.8 |\n 11837 | 2023-05-22 12:53:51 | MASTER-Amur | (18h 25m 33.94s , +25d 01m 03.8s) | C | 180 | 17.1 |\n 12049 | 2023-05-22 12:57:24 | MASTER-Amur | (18h 25m 36.44s , +25d 02m 12.0s) | C | 180 | 17.2 |\n 12262 | 2023-05-22 13:00:56 | MASTER-Amur | (18h 25m 31.18s , +25d 01m 33.9s) | C | 180 | 17.4 |\n 12474 | 2023-05-22 13:04:29 | MASTER-Amur | (18h 25m 30.07s , +25d 02m 25.9s) | C | 180 | 17.5 |\n 12693 | 2023-05-22 13:08:07 | MASTER-Amur | (18h 25m 35.67s , +25d 01m 18.8s) | C | 180 | 17.6 |\n 12905 | 2023-05-22 13:11:40 | MASTER-Amur | (18h 25m 29.62s , +25d 00m 10.4s) | C | 180 | 17.6 |\n 13117 | 2023-05-22 13:15:12 | MASTER-Amur | (18h 25m 35.03s , +25d 00m 08.1s) | C | 180 | 17.6 |\n 13330 | 2023-05-22 13:18:44 | MASTER-Amur | (18h 25m 31.65s , +25d 01m 49.3s) | C | 180 | 17.6 |\n 13542 | 2023-05-22 13:22:17 | MASTER-Amur | (18h 22m 51.71s , +31d 39m 51.4s) | C | 180 | 18.0 |\n 13755 | 2023-05-22 13:25:49 | MASTER-Amur | (18h 32m 09.42s , +31d 39m 08.5s) | C | 180 | 18.0 |\n 13967 | 2023-05-22 13:29:22 | MASTER-Amur | (18h 19m 03.49s , +29d 44m 31.9s) | C | 180 | 18.1 |\n 14180 | 2023-05-22 13:32:54 | MASTER-Amur | (18h 28m 09.75s , +29d 43m 48.1s) | C | 180 | 18.1 |\n 14393 | 2023-05-22 13:36:28 | MASTER-Amur | (18h 22m 50.32s , +31d 37m 47.1s) | C | 180 | 18.1 |\n 14606 | 2023-05-22 13:40:00 | MASTER-Amur | (18h 32m 10.82s , +31d 39m 34.8s) | C | 180 | 18.0 |\n 14818 | 2023-05-22 13:43:33 | MASTER-Amur | (18h 18m 58.78s , +29d 43m 07.8s) | C | 180 | 18.1 |\n 15031 | 2023-05-22 13:47:06 | MASTER-Amur | (18h 28m 15.27s , +29d 45m 02.1s) | C | 180 | 18.1 |\n 15244 | 2023-05-22 13:50:38 | MASTER-Amur | (18h 09m 37.48s , +33d 31m 56.8s) | C | 180 | 18.2 |\n 15456 | 2023-05-22 13:54:11 | MASTER-Amur | (18h 19m 20.25s , +33d 31m 16.7s) | C | 180 | 18.3 |\n 15669 | 2023-05-22 13:57:43 | MASTER-Amur | (18h 40m 40.87s , +31d 37m 21.9s) | C | 180 | 18.0 |\n 15887 | 2023-05-22 14:01:21 | MASTER-Amur | (18h 50m 01.44s , +31d 39m 08.5s) | C | 180 | 18.0 |\n 16100 | 2023-05-22 14:04:54 | MASTER-Amur | (18h 09m 39.47s , +33d 29m 32.4s) | C | 180 | 18.3 |\n 16312 | 2023-05-22 14:08:26 | MASTER-Amur | (18h 19m 17.66s , +33d 31m 21.9s) | C | 180 | 18.2 |\n 16524 | 2023-05-22 14:11:59 | MASTER-Amur | (18h 40m 31.51s , +31d 37m 30.9s) | C | 180 | 17.8 |\n 16737 | 2023-05-22 14:15:31 | MASTER-Amur | (18h 49m 56.01s , +31d 38m 47.6s) | C | 180 | 17.8 |\n 16949 | 2023-05-22 14:19:04 | MASTER-Amur | (18h 16m 25.56s , +27d 47m 03.6s) | C | 180 | 18.0 |\n 17162 | 2023-05-22 14:22:36 | MASTER-Amur | (18h 25m 34.86s , +27d 47m 51.1s) | C | 180 | 18.0 |\n 17383 | 2023-05-22 14:26:17 | MASTER-Amur | (18h 33m 40.05s , +27d 47m 56.1s) | C | 180 | 17.9 |\n 17595 | 2023-05-22 14:29:50 | MASTER-Amur | (18h 42m 46.37s , +27d 49m 28.7s) | C | 180 | 17.9 |\n 17832 | 2023-05-22 14:33:47 | MASTER-Amur | (18h 16m 23.33s , +27d 47m 18.8s) | C | 180 | 18.0 |\n 18045 | 2023-05-22 14:37:20 | MASTER-Amur | (18h 25m 27.48s , +27d 48m 37.1s) | C | 180 | 18.1 |\n 18183 | 2023-05-22 14:40:53 | MASTER-Amur | (18h 25m 27.64s , +24d 57m 04.9s) | C | 30 | 17.3 |\n 18246 | 2023-05-22 14:41:55 | MASTER-Amur | (18h 25m 23.01s , +24d 56m 01.1s) | C | 30 | 17.3 |\n 18308 | 2023-05-22 14:42:58 | MASTER-Amur | (18h 25m 27.60s , +24d 56m 06.9s) | C | 30 | 17.3 |\n 18371 | 2023-05-22 14:44:01 | MASTER-Amur | (18h 25m 25.64s , +24d 57m 39.0s) | C | 30 | 17.3 |\n 18434 | 2023-05-22 14:45:03 | MASTER-Amur | (18h 25m 25.75s , +24d 55m 54.3s) | C | 30 | 17.3 |\n 18497 | 2023-05-22 14:46:06 | MASTER-Amur | (18h 25m 27.37s , +24d 57m 45.3s) | C | 30 | 17.3 |\n 18560 | 2023-05-22 14:47:09 | MASTER-Amur | (18h 25m 22.72s , +24d 56m 42.4s) | C | 30 | 17.3 |\n 18623 | 2023-05-22 14:48:12 | MASTER-Amur | (18h 25m 22.61s , +24d 57m 37.5s) | C | 30 | 17.3 |\n 18685 | 2023-05-22 14:49:15 | MASTER-Amur | (18h 25m 28.45s , +24d 56m 34.0s) | C | 30 | 17.2 |\n 18748 | 2023-05-22 14:50:17 | MASTER-Amur | (18h 25m 22.74s , +24d 55m 29.7s) | C | 30 | 17.3 |\n 18811 | 2023-05-22 14:51:20 | MASTER-Amur | (18h 25m 29.50s , +24d 55m 37.9s) | C | 30 | 17.3 |\n 18873 | 2023-05-22 14:52:23 | MASTER-Amur | (18h 25m 25.40s , +24d 57m 07.9s) | C | 30 | 17.3 |\n 19011 | 2023-05-22 14:53:25 | MASTER-Amur | (18h 33m 38.51s , +27d 46m 07.8s) | C | 180 | 18.0 |\n 19224 | 2023-05-22 14:56:58 | MASTER-Amur | (18h 42m 44.76s , +27d 48m 19.8s) | C | 180 | 18.1 |\n 19436 | 2023-05-22 15:00:31 | MASTER-Amur | (18h 53m 51.50s , +29d 42m 44.4s) | C | 180 | 18.0 |\n 19649 | 2023-05-22 15:04:03 | MASTER-Amur | (19h 03m 10.65s , +29d 42m 05.9s) | C | 180 | 17.9 |\n 19861 | 2023-05-22 15:07:36 | MASTER-Amur | (18h 33m 00.18s , +22d 03m 52.7s) | C | 180 | 17.7 |\n 20074 | 2023-05-22 15:11:08 | MASTER-Amur | (18h 41m 34.88s , +22d 05m 40.7s) | C | 180 | 17.8 |\n 20286 | 2023-05-22 15:14:40 | MASTER-Amur | (18h 53m 54.46s , +29d 40m 12.3s) | C | 180 | 18.0 |\n 20498 | 2023-05-22 15:18:13 | MASTER-Amur | (19h 03m 09.35s , +29d 42m 06.9s) | C | 180 | 17.9 |\n 20735 | 2023-05-22 15:22:09 | MASTER-Amur | (18h 32m 53.36s , +22d 03m 43.5s) | C | 180 | 17.5 |\n 20947 | 2023-05-22 15:25:42 | MASTER-Amur | (18h 41m 31.56s , +22d 04m 59.5s) | C | 180 | 17.4 |\n 21160 | 2023-05-22 15:29:15 | MASTER-Amur | (18h 35m 05.87s , +20d 08m 27.5s) | C | 180 | 17.6 |\n 22132 | 2023-05-22 15:45:27 | MASTER-Amur | (18h 43m 36.01s , +20d 08m 05.3s) | C | 180 | 17.2 |\n 22344 | 2023-05-22 15:48:59 | MASTER-Amur | (18h 35m 09.40s , +20d 07m 41.9s) | C | 180 | 17.5 |\n 22769 | 2023-05-22 15:56:04 | MASTER-Amur | (18h 43m 34.40s , +20d 08m 24.9s) | C | 180 | 17.2 |\n 22982 | 2023-05-22 15:59:36 | MASTER-Amur | (16h 31m 50.40s , +45d 25m 20.0s) | C | 180 | 14.3 |\n 48017 | 2023-05-22 22:56:52 | MASTER-OAFA | (07h 18m 44.17s , -42d 36m 34.5s) | C | 180 | 12.6 |\n 48228 | 2023-05-22 23:00:23 | MASTER-OAFA | (07h 15m 28.04s , -40d 41m 57.3s) | C | 180 | 13.1 |\n 48803 | 2023-05-22 23:09:57 | MASTER-OAFA | (07h 06m 02.65s , -40d 42m 60.0s) | C | 180 | 13.0 |\n 49015 | 2023-05-22 23:13:29 | MASTER-OAFA | (07h 28m 37.57s , -42d 35m 27.3s) | C | 180 | 13.4 |\n 49785 | 2023-05-22 23:26:19 | MASTER-OAFA | (07h 28m 30.09s , -42d 37m 57.4s) | C | 180 | 12.3 |\n 50199 | 2023-05-22 23:33:14 | MASTER-OAFA | (06h 47m 20.76s , -42d 40m 59.3s) | C | 180 | 14.3 |\n 50411 | 2023-05-22 23:36:46 | MASTER-OAFA | (06h 58m 14.22s , -42d 38m 44.8s) | C | 180 | 13.7 |\n 50622 | 2023-05-22 23:40:17 | MASTER-OAFA | (07h 23m 04.98s , -38d 48m 52.6s) | C | 180 | 13.7 |\n 51404 | 2023-05-22 23:53:19 | MASTER-OAFA | (07h 23m 08.25s , -38d 49m 42.5s) | C | 180 | 12.8 |\n 51616 | 2023-05-22 23:56:50 | MASTER-OAFA | (07h 33m 22.49s , -38d 50m 42.4s) | C | 180 | 12.0 |\n 52038 | 2023-05-23 00:03:53 | MASTER-OAFA | (07h 46m 00.76s , -40d 42m 18.2s) | C | 180 | 12.1 |\n 53528 | 2023-05-23 00:28:42 | MASTER-OAFA | (06h 51m 18.26s , -36d 31m 33.9s) | C | 180 | 14.1 |\n 53950 | 2023-05-23 00:35:45 | MASTER-OAFA | (07h 47m 35.99s , -42d 08m 14.1s) | C | 180 | 12.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-23T02:50:54.840211Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T02:50:54.840242Z",
"modified": "2023-05-23T02:50:54.848365Z",
"nonlocalizedevents": [
{
"event_id": "S230522a"
}
],
"targets": []
},
{
"id": 48,
"topic": "gcn.circular",
"uuid": "218c9611-f838-4ad6-8175-ae6e924994d2",
"title": "LIGO/Virgo S230522n: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/23 02:50:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33854",
"subject": "LIGO/Virgo S230522n: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230522n errorbox 1687 sec after notice time and 1743 sec after trigger time at 2023-05-22 15:59:36 UT, with upper limit up to 14.3 mag. The observations began at zenith distance = 5 deg. The sun altitude is -19.3 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230522n errorbox 32656 sec after notice time and 32712 sec after trigger time at 2023-05-23 00:35:45 UT, with upper limit up to 12.9 mag. The observations began at zenith distance = 51 deg. The sun altitude is -36.5 deg.\n\nThe galactic latitude b = 32 deg., longitude l = 313 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011882\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 1834 | 2023-05-22 15:59:36 | MASTER-Amur | (16h 31m 50.40s , +45d 25m 20.0s) | C | 180 | 14.3 |\n 32802 | 2023-05-23 00:35:45 | MASTER-OAFA | (07h 47m 35.99s , -42d 08m 14.1s) | C | 180 | 12.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-23T02:50:59.876896Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T02:50:59.876937Z",
"modified": "2023-05-23T02:50:59.885172Z",
"nonlocalizedevents": [
{
"event_id": "S230522n"
}
],
"targets": []
},
{
"id": 49,
"topic": "gcn.circular",
"uuid": "0aeca2c4-4a1f-45ac-b10a-220ee610fd14",
"title": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-230523A",
"submitter": "Hop gcn.circular",
"authors": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"data": {
"date": "23/05/23 04:07:06 GMT",
"from": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"title": "GCN CIRCULAR",
"number": "33855",
"subject": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-230523A"
},
"message_text": "The AMON, IceCube, and HAWC collaborations report:\n\nThe AMON NuEm stream channel found a coincidence alert from the\nIceCube online neutrino selection + HAWC daily monitoring analysis.\nThe analysis looks for IceCube neutrino events -mostly atmospheric\nin origin- around the position and transit time of a HAWC cluster of\nlikely gamma rays, as identified in the integrated observations from\na single transit, in this case having a duration of 5.82 hours.\n\nThe HAWC transit interval starts from 2023/05/22 21:07:51 UT -\n2023/05/23 02:57:2 UT\n(End of the HAWC transit time)\n\nThe location of the coincidence is reported as\nRA (J2000): 143.40 deg\nDec (J2000): 4.83 deg\nLocation uncertainty (50% containment): 0.14 deg (statistical only).\nLocation uncertainty (90% containment): 0.25 deg (statistical only).\n\nThe false alarm rate (FAR) of this coincidence is 0.87 per year.\nWe encourage follow-up observations of the alert region contingent on\nthe availability of resources and interest, given the quoted FAR.\n\nAMON seeks to perform a real-time correlation analysis of the\nhigh-energy signals across all known astronomical messengers. More\ninformation about AMON can be found in https://www.amon.psu.edu/\nInformation on the IceCube collaboration: http://icecube.wisc.edu/\nInformation on the HAWC collaboration: https://www.hawc-observatory.org\n\n",
"published": "2023-05-23T04:07:15.185316Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T04:07:15.185336Z",
"modified": "2023-05-23T04:07:15.191983Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4703,
"topic": "gcn.circular",
"uuid": "0d229a0f-5218-46f3-aaca-1f32505de6f6",
"title": "GRB 231115A: GOTO pre-burst limits of AT2023xvj",
"submitter": "Hop gcn.circular",
"authors": "kendall.ackley@warwick.ac.uk",
"data": {
"date": "23/11/15 22:41:25 GMT",
"from": "kendall.ackley@warwick.ac.uk",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35050"
},
"title": "GCN CIRCULAR",
"number": "35050",
"subject": "GRB 231115A: GOTO pre-burst limits of AT2023xvj"
},
"message_text": "K. Ackley, D. Steeghs, B. P. Gompertz, A. J. Levan, D. B. Malesani, R. Starling, M. J. Dyer, J. Lyman, K. Ulaczyk, F. Jimenez-Ibarra, A. Kumar, D. O'Neill, D. K. Galloway, V. Dhillon, P. O'Brien; G. Ramsay, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nThe Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) serendipitously covered the field of GRB 231115A (Fermi GBM Team, GCN 35035; Mereghetti et al, GCN 35037; Cheung et al. GCN 35045) at 04:44:17 UT on 2023-11-15. This is 10.87 hours before trigger and 16.9 hours later than the limits reported in Ahumada et al. (GCN 25048). The observation consisted of a 12x60s exposure set in the GOTO L-band (400-700 nm).\n\nAnalysis at the location of the potential optical transient https://www.wis-tns.org/object/2023xvj (Kumar et al. GCN 35041) does not show evidence of the source to a 3-sigma limiting AB magnitude of L > 20.1.\n\nImages were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed manually on the stacked set using recent survey observations of the same pointings.\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nFurther observations are scheduled during the coming nights.\n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35050.",
"published": "2023-11-15T22:41:36.617609Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T22:41:36.617645Z",
"modified": "2023-11-15T22:41:36.627871Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 50,
"topic": "gcn.circular",
"uuid": "261bf717-740a-4fa4-b8bd-76cb762f3268",
"title": "GRB 230523A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/23 11:33:48 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33856",
"subject": "GRB 230523A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 11:23:09 UT on 23 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230523A (trigger 706533794.188064 / 230523474).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 129.4, Dec = 29.0 (J2000 degrees, equivalent to J2000 08h 37m, 29d 00'), with a statistical uncertainty of 3.7 degrees.\n\nThe angle from the Fermi LAT boresight is 43.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230523474/quicklook/glg_skymap_all_bn230523474.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230523474/quicklook/glg_healpix_all_bn230523474.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230523474/quicklook/glg_lc_medres34_bn230523474.gif\n\n",
"published": "2023-05-23T11:33:57.325302Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T11:33:57.325355Z",
"modified": "2023-05-23T11:33:57.334684Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 51,
"topic": "gcn.circular",
"uuid": "ad9da1ce-06b5-4c27-ac4b-16c6ec8cfdc8",
"title": "Fermi Gamma-ray Burst Monitor trigger 706536788/230523509 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Andreas von Kienlin at MPE <azk@mpe.mpg.de>",
"data": {
"date": "23/05/23 12:47:13 GMT",
"from": "Andreas von Kienlin at MPE <azk@mpe.mpg.de>",
"title": "GCN CIRCULAR",
"number": "33857",
"subject": "Fermi Gamma-ray Burst Monitor trigger 706536788/230523509 is not a GRB"
},
"message_text": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 706536788/230523509 at\n12:13:03 UT\non 23 May 2023, tentatively classified as GRB, is in fact not due to a GRB.\nThis trigger is due to a Solar Flare.\"\n\n\n",
"published": "2023-05-23T12:47:22.474564Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T12:47:22.474612Z",
"modified": "2023-05-23T12:47:22.480598Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 52,
"topic": "gcn.circular",
"uuid": "39d08af4-2993-4b01-806a-35629395e0c8",
"title": "LIGO/Virgo/KAGRA S230521k: Additional candidates from Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/05/23 20:38:13 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33858",
"subject": "LIGO/Virgo/KAGRA S230521k: Additional candidates from Zwicky Transient Facility"
},
"message_text": "Vishwajeet Swain (IITB), Harsh Kumar (IITB), Viraj Karambelkar (CIT), Anirudh Salgundi (IITB), Akash Anumarlapudi (UWM), Robert Stein (CIT), Tomas Ahumada (CIT), Michael Coughlin (UMN), Mansi Kasliwal (CIT), Theophile du Laz (CIT), Eric Bellm (UW), Igor Andreoni (UMD) report on behalf of the ZTF collaboration:\n\nZwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al., 2019) continued to serendipitously cover the localization region of LVC trigger S230521k. In our previous GCN #33848 (T. Ahumada et al), we announced two candidates from observations on the first night. Continued observations cover 20.5% of the probability of the localization region at least twice.\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep), AMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021). We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-match our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require that no spatially coincident ZTF alerts were issued before the detection time of the LVC trigger.\n\nThe following sources passed our criteria and were inside the 95% error region:\n\n|-----------------------------------------------------------------------------------------------------\n| ZTF id | TNS name | ra | dec | mjd | mag±err (ab) | filter |\n|-----------------------------------------------------------------------------------------------------\n\nZTF23aalczjh | AT2023jfn | 202.39335 | 70.869591 | 60086.23392 | 20.25 ± 0.16 | g |\nZTF23aalczjc | --------- | 187.26158 | 70.850479 | 60086.19871 | 20.18 ± 0.23 | r |\nZTF23aakyfsk | AT2023jft | 180.89014 | 61.38805 | 60086.22718 | 20.40 ± 0.19 | g |\nZTF23aalcvpw | AT2023jfp | 173.47154 | 29.19382 | 60086.19722 | 20.36 ± 0.26 | r |\n\n|-----------------------------------------------------------------------------------------------------\n\nWe followed up ZTF23aalczjh, ZTF23aalczjc and ZTF23aakyfsk with 0.7m GROWTH-India Telescope and found that:\n\nZTF23aalczjh and ZTF23aakyfsk are not showing any significant evolution.\nZTF23aalczjc is blue (g-r = -0.22 ± 0.1 mag) and shows weak evidence of fading in r band (0.68 ± 0.55 mag/day), but g-band is consistent with no evolution.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available a https://sites.google.com/view/growthindia/.\n\n",
"published": "2023-05-23T20:38:25.865482Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T20:38:25.865501Z",
"modified": "2023-05-23T20:38:25.872973Z",
"nonlocalizedevents": [
{
"event_id": "S230521k"
}
],
"targets": []
},
{
"id": 53,
"topic": "gcn.circular",
"uuid": "e0fd3f5b-777c-4dfb-b45c-5969e55230d7",
"title": "GRB 230523A: Swift/BAT-GUANO detection of a short hard burst",
"submitter": "Hop gcn.circular",
"authors": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"data": {
"date": "23/05/23 22:58:55 GMT",
"from": "Aaron Tohuvavohu at University of Toronto <aaron.tohu@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33859",
"subject": "GRB 230523A: Swift/BAT-GUANO detection of a short hard burst"
},
"message_text": "Gayathri Raman (PSU), Samuele Ronchini (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 230523A onboard (T0: 2023-05-23T15:23:52.68 UTC, INTEGRAL/SPI-ACS #10268).\n\nThe INTEGRAL notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 90 seconds of BAT event-mode data from [-45,+45] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 12.4 in a 1.024 s analysis time bin.\nThe burst duration is ~2 seconds.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a borderline DeltaLLHOut of 8.33.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n",
"published": "2023-05-23T22:59:04.343437Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-23T22:59:04.343458Z",
"modified": "2023-05-23T22:59:04.351175Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2234,
"topic": "gcn.circular",
"uuid": "b2e345d7-4894-4c55-bdfc-2f488477812d",
"title": "GRB 230818A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/19 15:19:55 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34489",
"subject": "GRB 230818A: Swift-XRT refined Analysis"
},
"message_text": "S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P.\nBeardmore (U. Leicester), J.P. Osborne (U. Leicester), E. Ambrosi\n(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR)\nand P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.4 ks of XRT data for GRB 230818A, from 125 s to 40.1\nks after the BAT trigger. The data comprise 41 s in Windowed Timing\n(WT) mode (the first 9 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=2.2 (+0.5, -0.4), followed by a break at T+385 s to an\nalpha of 0.76 (+/-0.06).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.96 (+0.21, -0.20). The\nbest-fitting absorption column is 1.8 (+/-0.7) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.6 x 10^-11 (4.7 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.8 (+/-0.7) x 10^21 cm^-2\nGalactic foreground: 1.1 x 10^21 cm^-2\nExcess significance: 1.8 sigma\nPhoton index:\t 1.96 (+0.21, -0.20)\n\nIf the light curve continues to decay with a power-law decay index of\n0.76, the count rate at T+24 hours will be 0.012 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.3 x\n10^-13 (5.7 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01186032.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDU4NDAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ulfWoC3L_jTSaUYUQRcU64zOBPE2YTuFKQ2M3mkbOfw\n\n",
"published": "2023-08-19T15:20:09.700819Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T15:20:09.700838Z",
"modified": "2023-08-19T15:20:09.707496Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 55,
"topic": "gcn.circular",
"uuid": "064ffa8a-5937-49a8-8234-743862227ba9",
"title": "LIGO/Virgo/KAGRA S230521k: MASTER new OT discovery",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/24 00:18:42 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33861",
"subject": "LIGO/Virgo/KAGRA S230521k: MASTER new OT discovery"
},
"message_text": "V.Lipunov, Ya.Kechin (Lomonosov MSU), D.Buckley (SAAO),\nK.Zhirkov, A.Kuznetsov, P.Balanutsa, A.Chasovnikov, O.Gress, N.Tiurina,E.Gorbovskoy, G.Antipov, D.Vlasenko, V.Senik,\nV.Topolev, Yu.Tselik, Siyu Wu, V.Vladimirov, D.Cheryasov, D.Zimnukhov, T.Pogrosheva, V.Shumkov, K.Vetrov (Lomonosov Moscow State University, SAI,Physics Department),\nC.Francile, F. Podesta, C.Lopez, R. Podesta (Observatorio Astronomico Felix Aguilar OAFA),\nR. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.Corella,L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),\nN.M.Budnev, O.Ershova (ISU,API),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational State University),\nM.Gulyaev, E.Minkina (Lomonosov MSU)\n\n\nMASTER OT J071612.28-415537.5 discovery\n\nDuring LVC S230521k https://gcn.gsfc.nasa.gov/notices_l/S230521k.lvc\ninspection survey (Lipunov et al. GCN 33849)\nMASTER-SAAO auto-detection system ( Lipunov et al., \"MASTER Global Robotic Net\", Advances in Astronomy, 2010, 30L )\n discovered OT source at (R.A.,Dec.2000) = 07h 16m 12.28s -41d 55m 37.5s on 2023-05-23.71558 UT.\n\nThe OT unfiltered magnitude is 18.2m (mlim\u0019.0).\n\nThe OT is seen in 4 images. There is no minor planet at this place.\n\nWe have reference images on 2021-02-16 02:18:16UT with mlim\u0019.5,\non 2014-12-24.97843 UT with unfiltered mlim\u0019.7m and other, there is no outbursts at automatic light curve, but analysis of archive images will be continued.\n\nSpectral observations and deep photometry are required.\nObservations and analysis will be continued.\n\n",
"published": "2023-05-24T00:18:51.609903Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T00:18:51.609925Z",
"modified": "2023-05-24T00:18:51.618181Z",
"nonlocalizedevents": [
{
"event_id": "S230521k"
}
],
"targets": []
},
{
"id": 56,
"topic": "gcn.circular",
"uuid": "0ac0dc44-0d32-412f-8bd8-b536e50633a3",
"title": "Fermi trigger No 706536788: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/24 00:45:43 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33862",
"subject": "Fermi trigger No 706536788: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230523.51 (trigger No 706536788,11h 48m 04.80s , -54d 19m 48.0s, R$.36) errorbox 33885 sec after notice time and 33920 sec after trigger time at 2023-05-23 21:38:23 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 50 deg. The sun altitude is -72.9 deg.\n\nThe galactic latitude b = 7 deg., longitude l = 294 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"18711\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 34011 | 2023-05-23 21:38:23 | MASTER-SAAO | (10h 58m 13.80s , -36d 37m 39.6s) | C | 180 | 19.4 |\n 34011 | 2023-05-23 21:38:23 | MASTER-SAAO | (10h 59m 13.65s , -36d 37m 47.4s) | C | 180 | 19.3 |\n 34210 | 2023-05-23 21:41:43 | MASTER-SAAO | (11h 09m 09.23s , -36d 36m 30.7s) | C | 180 | 19.3 |\n 34210 | 2023-05-23 21:41:43 | MASTER-SAAO | (11h 08m 09.53s , -36d 36m 22.9s) | C | 180 | 19.3 |\n 34831 | 2023-05-23 21:52:04 | MASTER-SAAO | (10h 59m 06.36s , -36d 35m 38.6s) | C | 180 | 19.3 |\n 34831 | 2023-05-23 21:52:04 | MASTER-SAAO | (10h 58m 07.01s , -36d 35m 31.4s) | C | 180 | 19.1 |\n 35043 | 2023-05-23 21:55:35 | MASTER-SAAO | (11h 09m 11.70s , -36d 36m 45.3s) | C | 180 | 19.5 |\n 35043 | 2023-05-23 21:55:35 | MASTER-SAAO | (11h 08m 12.23s , -36d 36m 38.5s) | C | 180 | 19.3 |\n 39051 | 2023-05-23 23:02:23 | MASTER-SAAO | (11h 14m 13.47s , -28d 58m 51.9s) | C | 180 | 18.9 |\n 39051 | 2023-05-23 23:02:23 | MASTER-SAAO | (11h 13m 19.94s , -28d 58m 42.9s) | C | 180 | 18.9 |\n 39262 | 2023-05-23 23:05:54 | MASTER-SAAO | (11h 23m 15.91s , -28d 59m 56.4s) | C | 180 | 19.2 |\n 39262 | 2023-05-23 23:05:54 | MASTER-SAAO | (11h 22m 22.46s , -28d 59m 48.0s) | C | 180 | 19.1 |\n 39895 | 2023-05-23 23:16:28 | MASTER-SAAO | (11h 13m 22.51s , -28d 57m 37.2s) | C | 180 | 18.2 |\n 39895 | 2023-05-23 23:16:28 | MASTER-SAAO | (11h 14m 15.44s , -28d 57m 46.2s) | C | 180 | 18.4 |\n 40107 | 2023-05-23 23:20:00 | MASTER-SAAO | (11h 22m 25.28s , -28d 58m 24.8s) | C | 180 | 18.4 |\n 40107 | 2023-05-23 23:20:00 | MASTER-SAAO | (11h 23m 18.40s , -28d 58m 33.9s) | C | 180 | 18.5 |\n 42845 | 2023-05-24 00:05:38 | MASTER-SAAO | (09h 08m 20.70s , -70d 45m 13.0s) | C | 180 | 14.3 |\n 42845 | 2023-05-24 00:05:38 | MASTER-SAAO | (09h 10m 40.64s , -70d 45m 10.0s) | C | 180 | 14.3 |\n 44110 | 2023-05-24 00:26:43 | MASTER-SAAO | (11h 21m 52.47s , -74d 32m 46.1s) | C | 180 | 15.0 |\n 44110 | 2023-05-24 00:26:43 | MASTER-SAAO | (11h 18m 55.91s , -74d 32m 40.2s) | C | 180 | 15.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-24T00:45:52.677930Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T00:45:52.677952Z",
"modified": "2023-05-24T00:45:52.683493Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 58,
"topic": "gcn.circular",
"uuid": "9ab5f512-f0bd-4291-845c-d340a684739b",
"title": "Fermi trigger No 706599831: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/24 06:15:27 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33863",
"subject": "Fermi trigger No 706599831: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230524.24 (trigger No 706599831,22h 55m 48.00s , +01d 51m 00.0s, R=2.12) errorbox 1224 sec after notice time and 1257 sec after trigger time at 2023-05-24 06:04:43 UT, with upper limit up to 16.5 mag. The observations began at zenith distance = 82 deg. The sun altitude is -66.7 deg.\n\nThe galactic latitude b = -50 deg., longitude l = 75 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"18856\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 1348 | 2023-05-24 06:04:43 | MASTER-OAFA | (22h 54m 24.06s , +01d 29m 36.8s) | C | 180 | 16.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-24T06:15:35.706974Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T06:15:35.706996Z",
"modified": "2023-05-24T06:15:35.711890Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 59,
"topic": "gcn.circular",
"uuid": "a7d103dc-068f-4f06-8da7-b66abe715805",
"title": "GRB 230524A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/24 06:16:55 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33864",
"subject": "GRB 230524A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 06:06:35 UT on 24 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230524A (trigger 706601200.806822 / 230524255).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 177.5, Dec = 16.3 (J2000 degrees, equivalent to J2000 11h 50m, 16d 18'), with a statistical uncertainty of 3.2 degrees.\n\nThe angle from the Fermi LAT boresight is 93.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230524255/quicklook/glg_skymap_all_bn230524255.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230524255/quicklook/glg_healpix_all_bn230524255.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230524255/quicklook/glg_lc_medres34_bn230524255.gif\n\n",
"published": "2023-05-24T06:17:00.960830Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T06:17:00.960974Z",
"modified": "2023-05-24T06:17:00.966346Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 77,
"topic": "gcn.circular",
"uuid": "9905c4f3-8767-4e5c-b7c0-d390a198c96f",
"title": "GRB 230523B: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/05/25 10:57:50 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "33875",
"subject": "GRB 230523B: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe short-duration GRB 230523B (Swift/BAT-GUANO detection: GCN 33859; INTEGRAL/SPI-ACS trigger no. 10268; Konus/Wind detection at 2023-05-23 15:23:51.501 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-05-23 15:23:53 UTC. The light curve observed by GRBAlpha shows a spike within one 1 s bin where the SNR reaches 5 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230523B_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n",
"published": "2023-05-25T10:57:59.275262Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T10:57:59.275293Z",
"modified": "2023-05-25T10:57:59.281832Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 1491,
"topic": "gcn.circular",
"uuid": "1aeb5064-ad86-4e9f-9541-a0124e25020a",
"title": "Swift GRB 230723B: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/07/23 17:08:58 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34239",
"subject": "Swift GRB 230723B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 230723B ( K. L. Page et al., GCN 34234) errorbox 18882 sec after notice time and 18900 sec after trigger time at 2023-07-23 16:57:33 UT, with upper limit up to 19.3 mag. Observations started at twilight. The observations began at zenith distance = 42 deg. The sun altitude is -13.0 deg.\n\nThe galactic latitude b = 25 deg., longitude l = 12 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"43736\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 18990 | MASTER-SAAO | C | 180 | 18.1 |\n 18990 | MASTER-SAAO | C | 180 | 19.1 |\n 19201 | MASTER-SAAO | C | 180 | 18.4 |\n 19201 | MASTER-SAAO | C | 180 | 19.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwMTMyMTQ0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.eBLw5pUvDGuRu59UduneBDbmauegiJ8YZU8uSohMIQg\n\n",
"published": "2023-07-23T17:09:09.751464Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-23T17:09:09.751496Z",
"modified": "2023-07-23T17:09:09.759998Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 61,
"topic": "gcn.circular",
"uuid": "b2796616-94d8-4d95-a996-dcb459f49a6f",
"title": "LIGO/Virgo S230524b: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/24 06:24:26 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33865",
"subject": "LIGO/Virgo S230524b: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230524b errorbox 60 sec after notice time and 95 sec after trigger time at 2023-05-24 06:14:55 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 66 deg. The sun altitude is -64.6 deg.\n\nThe galactic latitude b = 44 deg., longitude l = 50 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011887\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 106 | 2023-05-24 06:14:55 | MASTER-OAFA | (16h 16m 46.14s , +31d 07m 13.6s) | C | 20 | 17.5 |\n 150 | 2023-05-24 06:15:35 | MASTER-OAFA | (16h 16m 39.33s , +31d 06m 12.3s) | C | 30 | 17.7 |\n 205 | 2023-05-24 06:16:24 | MASTER-OAFA | (16h 16m 46.20s , +31d 06m 32.0s) | C | 40 | 17.9 |\n 269 | 2023-05-24 06:17:24 | MASTER-OAFA | (16h 16m 42.25s , +31d 07m 41.7s) | C | 50 | 18.1 |\n 344 | 2023-05-24 06:18:33 | MASTER-OAFA | (16h 16m 42.25s , +31d 06m 08.2s) | C | 60 | 18.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-24T06:24:34.751153Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T06:24:34.751186Z",
"modified": "2023-05-24T06:24:34.756217Z",
"nonlocalizedevents": [
{
"event_id": "S230524b"
}
],
"targets": []
},
{
"id": 62,
"topic": "gcn.circular",
"uuid": "95f053c8-a526-480e-b3d9-592ef77b9132",
"title": "Fermi trigger No 706610076: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/24 11:00:26 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33866",
"subject": "Fermi trigger No 706610076: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230524.36 (trigger No 706610076,00h 52m 19.20s , -87d 46m 12.0s, R=4.46) errorbox 1734 sec after notice time and 1767 sec after trigger time at 2023-05-24 09:03:59 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 58 deg. The sun altitude is -28.7 deg.\n\nThe galactic latitude b = -30 deg., longitude l = 303 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"18977\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 1858 | 2023-05-24 09:03:59 | MASTER-OAFA | (00h 58m 40.27s , -88d 01m 24.9s) | C | 180 | 17.7 |\n 2057 | 2023-05-24 09:07:18 | MASTER-OAFA | (00h 59m 12.93s , -88d 02m 52.5s) | C | 180 | 18.0 |\n 2237 | 2023-05-24 09:07:18 | MASTER-OAFA | (00h 59m 13.01s , -88d 02m 52.5s) | C | 540 | 18.5 | Coadd\n 2256 | 2023-05-24 09:10:37 | MASTER-OAFA | (00h 59m 27.79s , -88d 00m 55.7s) | C | 180 | 18.1 |\n 2456 | 2023-05-24 09:13:57 | MASTER-OAFA | (00h 59m 44.40s , -88d 01m 40.0s) | C | 180 | 18.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-24T11:00:36.251294Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T11:00:36.251356Z",
"modified": "2023-05-24T11:00:36.256798Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 63,
"topic": "gcn.circular",
"uuid": "6c66e162-1140-44e8-88c4-45df6b58d4d2",
"title": "GRB 230524A: AGILE detection",
"submitter": "Hop gcn.circular",
"authors": "Gabriele Panebianco <gabriele.panebianco@inaf.it>",
"data": {
"date": "23/05/24 11:35:12 GMT",
"from": "Gabriele Panebianco <gabriele.panebianco@inaf.it>",
"title": "GCN CIRCULAR",
"number": "33867",
"subject": "GRB 230524A: AGILE detection"
},
"message_text": " G. Panebianco (Univ. Bologna - INAF/OAS Bologna), A. Ursi (ASI and INAF/IAPS), F. Verrecchia, C. Pittori (SSDC, and INAF/OAR), F. Longo (Univ. Trieste and INFN Trieste), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Casentini, A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli (SSDC, and INAF/OAR), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma, E. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi), and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team:\n\nThe AGILE satellite detected the GRB 230524A at T0 = 2023-05-24 06:06:35 s\n(UTC), reported by Fermi GBM (GCN #33864).\nThe burst is clearly visible in the AGILE scientific ratemeters of the\nMiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)\ndetectors.\nThe event lasted about 12 s and it released a total number\nof 8723 counts in the MCAL detector (above a background rate of 595 Hz)\nand 43686 counts in the AC-Top detector (above a background rate of 3171 Hz).\nThe AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB230524A_AGILE_RM_D.png .\n\nAdditional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html\n\n",
"published": "2023-05-24T11:35:21.430038Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T11:35:21.430058Z",
"modified": "2023-05-24T11:35:21.436428Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 64,
"topic": "gcn.circular",
"uuid": "b706823e-0697-455f-a966-f01c5a33f267",
"title": "GRB 230524A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/05/24 13:31:35 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33868",
"subject": "GRB 230524A: AstroSat CZTI detection"
},
"message_text": "P K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 230524A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 33864), and AGILE (Panebianco et al., GCN Circ. 33867).\n\nThe source was detected in the 20-200 keV energy range. The light curve peaks at 2023-05-24 06:06:40.50 UTC. The measured peak count rate associated with the burst is 97 (+37, -13) counts/s above the background in the combined data of three quadrants (out of four), with a total of 617 (+249, -270) counts. The local mean background count rate was 324 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 16 (+6, -10) s.\n\nThe source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-05-24 06:06:40.50 UTC. The measured peak count rate associated with the burst is 448 (+71, -56) counts/s above the background in the combined data of all quadrants, with a total of 5102 (+531, -606) counts. The local mean background count rate was 1398 (+5, -5) counts/s. We measure a T90 of 22 (+10, -4) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n",
"published": "2023-05-24T13:31:44.130819Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T13:31:44.130840Z",
"modified": "2023-05-24T13:31:44.139171Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 65,
"topic": "gcn.circular",
"uuid": "4f7467ec-8f46-4ca0-87b6-9b219ca48f2a",
"title": "GRB 230524B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/05/24 13:36:46 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33869",
"subject": "GRB 230524B: AstroSat CZTI detection"
},
"message_text": "\n\nP K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a probable long GRB 230524B which was also detected by Fermi-GBM (Trigger Number 706599831).\n\nThe source was detected in the 20-200 keV energy range. The light curve peaks at 2023-05-24 05:43:58.50 UTC. The measured peak count rate associated with the burst is 108 (+47, -6) counts/s above the background in the combined data of all quadrants, with a total of 1060 (+469, -248) counts. The local mean background count rate was 409 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of 21 (+12, -8) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n",
"published": "2023-05-24T13:36:51.743673Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T13:36:51.743694Z",
"modified": "2023-05-24T13:36:51.748876Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 85,
"topic": "gcn.circular",
"uuid": "6dd8724c-1748-4908-9eb8-ea654d42dfd8",
"title": "LIGO/Virgo/KAGRA S230520ae: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Deep Chatterjee at MIT <deep.chatterjee@ligo.org>",
"data": {
"date": "23/05/26 22:04:48 GMT",
"from": "Deep Chatterjee at MIT <deep.chatterjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33883",
"subject": "LIGO/Virgo/KAGRA S230520ae: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230520ae (GCN Circular 33838). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230520ae\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1702 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2014 +/- 663 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide <https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n",
"published": "2023-05-26T22:04:57.396439Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-26T22:04:57.396459Z",
"modified": "2023-05-26T22:04:57.402921Z",
"nonlocalizedevents": [
{
"event_id": "S230520a"
}
],
"targets": []
},
{
"id": 86,
"topic": "gcn.circular",
"uuid": "52142084-2da3-4524-ac44-4ad8a2f8a013",
"title": "LIGO/Virgo/KAGRA S230518h: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Deep Chatterjee at MIT <deep.chatterjee@ligo.org>",
"data": {
"date": "23/05/26 22:24:59 GMT",
"from": "Deep Chatterjee at MIT <deep.chatterjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33884",
"subject": "LIGO/Virgo/KAGRA S230518h: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further offline analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230518h (GCN Circular 33816). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230518h\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 460 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 204 +/- 57 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide <https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n",
"published": "2023-05-26T22:25:08.153333Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-26T22:25:08.153355Z",
"modified": "2023-05-26T22:25:08.159523Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 87,
"topic": "gcn.circular",
"uuid": "3aebc7b2-ab71-46b7-b1b9-6a14ca20521b",
"title": "LIGO/Virgo S230525a: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/27 15:28:22 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33885",
"subject": "LIGO/Virgo S230525a: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230525a errorbox 163 sec after notice time and 220 sec after trigger time at 2023-05-25 02:41:57 UT, with upper limit up to 20.2 mag. The observations began at zenith distance = 57 deg. The sun altitude is -34.4 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230525a errorbox 1383 sec after notice time and 1440 sec after trigger time at 2023-05-25 03:02:17 UT, with upper limit up to 19.9 mag. The observations began at zenith distance = 59 deg. The sun altitude is -67.6 deg.\n\nThe galactic latitude b = -87 deg., longitude l = 318 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011898\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 241 | 2023-05-25 02:41:57 | MASTER-SAAO | (00h 43m 52.46s , -30d 57m 22.2s) | C | 40 | 18.9 |\n 301 | 2023-05-25 02:41:57 | MASTER-SAAO | (00h 43m 52.51s , -30d 57m 22.1s) | C | 160 | 19.7 | Coadd\n 241 | 2023-05-25 02:41:57 | MASTER-SAAO | (00h 42m 56.31s , -30d 57m 42.5s) | C | 40 | 18.9 |\n 301 | 2023-05-25 02:41:57 | MASTER-SAAO | (00h 42m 56.35s , -30d 57m 42.5s) | C | 160 | 19.7 | Coadd\n 305 | 2023-05-25 02:42:56 | MASTER-SAAO | (00h 43m 49.73s , -30d 55m 53.7s) | C | 50 | 19.0 |\n 305 | 2023-05-25 02:42:56 | MASTER-SAAO | (00h 42m 53.62s , -30d 56m 14.4s) | C | 50 | 18.9 |\n 384 | 2023-05-25 02:44:06 | MASTER-SAAO | (00h 42m 53.71s , -30d 57m 44.2s) | C | 70 | 18.8 |\n 384 | 2023-05-25 02:44:06 | MASTER-SAAO | (00h 43m 49.85s , -30d 57m 23.5s) | C | 70 | 18.9 |\n 494 | 2023-05-25 02:45:46 | MASTER-SAAO | (00h 42m 55.50s , -30d 55m 52.9s) | C | 90 | 19.4 |\n 494 | 2023-05-25 02:45:46 | MASTER-SAAO | (00h 43m 51.61s , -30d 55m 31.0s) | C | 90 | 19.5 |\n 619 | 2023-05-25 02:45:46 | MASTER-SAAO | (00h 43m 51.61s , -30d 55m 30.9s) | C | 340 | 20.2 | Coadd\n 619 | 2023-05-25 02:45:46 | MASTER-SAAO | (00h 42m 55.50s , -30d 55m 52.9s) | C | 340 | 20.0 | Coadd\n 624 | 2023-05-25 02:47:46 | MASTER-SAAO | (00h 42m 50.68s , -30d 56m 48.7s) | C | 110 | 19.5 |\n 624 | 2023-05-25 02:47:46 | MASTER-SAAO | (00h 43m 46.82s , -30d 56m 27.0s) | C | 110 | 19.6 |\n 769 | 2023-05-25 02:49:55 | MASTER-SAAO | (00h 43m 45.72s , -30d 55m 26.6s) | C | 140 | 19.6 |\n 769 | 2023-05-25 02:49:55 | MASTER-SAAO | (00h 42m 49.54s , -30d 55m 49.5s) | C | 140 | 19.6 |\n 990 | 2023-05-25 02:53:17 | MASTER-SAAO | (17h 31m 36.89s , +18d 18m 59.8s) | C | 180 | 18.2 |\n 990 | 2023-05-25 02:53:17 | MASTER-SAAO | (17h 32m 30.08s , +18d 20m 39.0s) | C | 180 | 18.5 |\n 1204 | 2023-05-25 02:56:50 | MASTER-SAAO | (17h 39m 56.49s , +18d 17m 39.9s) | C | 180 | 18.2 |\n 1204 | 2023-05-25 02:56:50 | MASTER-SAAO | (17h 40m 49.81s , +18d 19m 17.4s) | C | 180 | 18.5 |\n 1430 | 2023-05-25 03:00:37 | MASTER-SAAO | (02h 11m 19.03s , -27d 30m 31.0s) | C | 180 | 18.0 |\n 1430 | 2023-05-25 03:00:37 | MASTER-SAAO | (02h 10m 26.37s , -27d 30m 22.3s) | C | 180 | 18.9 |\n 1530 | 2023-05-25 03:02:17 | MASTER-OAFA | (13h 34m 37.77s , +25d 54m 56.5s) | C | 180 | 19.2 |\n 1643 | 2023-05-25 03:04:09 | MASTER-SAAO | (02h 20m 19.94s , -27d 31m 29.7s) | C | 180 | 18.4 |\n 1643 | 2023-05-25 03:04:09 | MASTER-SAAO | (02h 19m 27.44s , -27d 31m 22.2s) | C | 180 | 19.2 |\n 1742 | 2023-05-25 03:05:48 | MASTER-OAFA | (13h 42m 43.76s , +25d 55m 21.5s) | C | 180 | 19.1 |\n 1855 | 2023-05-25 03:07:41 | MASTER-SAAO | (02h 08m 13.23s , -25d 37m 05.0s) | C | 180 | 19.3 |\n 1855 | 2023-05-25 03:07:41 | MASTER-SAAO | (02h 09m 04.81s , -25d 37m 11.9s) | C | 180 | 18.7 |\n 1953 | 2023-05-25 03:09:19 | MASTER-OAFA | (13h 51m 35.39s , +25d 56m 48.2s) | C | 180 | 18.8 |\n 2066 | 2023-05-25 03:11:13 | MASTER-SAAO | (02h 17m 57.73s , -25d 35m 57.5s) | C | 180 | 18.8 |\n 2066 | 2023-05-25 03:11:13 | MASTER-SAAO | (02h 17m 06.29s , -25d 35m 51.1s) | C | 180 | 19.3 |\n 2164 | 2023-05-25 03:12:50 | MASTER-OAFA | (13h 25m 45.46s , +25d 54m 33.6s) | C | 180 | 19.1 |\n 2278 | 2023-05-25 03:14:45 | MASTER-SAAO | (02h 11m 20.44s , -27d 31m 12.4s) | C | 180 | 18.7 |\n 2278 | 2023-05-25 03:14:45 | MASTER-SAAO | (02h 10m 28.01s , -27d 31m 04.9s) | C | 180 | 19.2 |\n 2478 | 2023-05-25 03:18:04 | MASTER-SAAO | (02h 20m 16.68s , -27d 31m 59.1s) | C | 180 | 18.6 |\n 2478 | 2023-05-25 03:18:04 | MASTER-SAAO | (02h 19m 24.27s , -27d 31m 51.4s) | C | 180 | 19.3 |\n 2621 | 2023-05-25 03:20:28 | MASTER-OAFA | (12h 21m 28.53s , +33d 30m 12.9s) | C | 180 | 16.5 |\n 2689 | 2023-05-25 03:21:36 | MASTER-SAAO | (02h 08m 17.55s , -25d 37m 48.6s) | C | 180 | 19.2 |\n 2689 | 2023-05-25 03:21:36 | MASTER-SAAO | (02h 09m 09.24s , -25d 37m 56.8s) | C | 180 | 18.9 |\n 2833 | 2023-05-25 03:24:00 | MASTER-OAFA | (12h 31m 11.58s , +33d 29m 25.8s) | C | 180 | 16.9 |\n 2900 | 2023-05-25 03:25:07 | MASTER-SAAO | (02h 17m 07.57s , -25d 36m 05.4s) | C | 180 | 19.3 |\n 2900 | 2023-05-25 03:25:07 | MASTER-SAAO | (02h 17m 59.38s , -25d 36m 13.1s) | C | 180 | 18.9 |\n 3044 | 2023-05-25 03:27:31 | MASTER-OAFA | (12h 36m 08.96s , +20d 10m 50.0s) | C | 180 | 18.6 |\n 3112 | 2023-05-25 03:28:38 | MASTER-SAAO | (02h 06m 21.25s , -23d 42m 51.3s) | C | 180 | 19.3 |\n 3112 | 2023-05-25 03:28:38 | MASTER-SAAO | (02h 07m 12.49s , -23d 42m 59.6s) | C | 180 | 18.9 |\n 3255 | 2023-05-25 03:31:02 | MASTER-OAFA | (12h 44m 37.31s , +20d 12m 16.3s) | C | 180 | 18.7 |\n 3322 | 2023-05-25 03:32:09 | MASTER-SAAO | (02h 15m 49.92s , -23d 43m 22.8s) | C | 180 | 19.0 |\n 3322 | 2023-05-25 03:32:09 | MASTER-SAAO | (02h 14m 58.77s , -23d 43m 14.0s) | C | 180 | 19.3 |\n 3466 | 2023-05-25 03:34:33 | MASTER-OAFA | (12h 21m 32.49s , +33d 27m 56.3s) | C | 180 | 16.2 |\n 3534 | 2023-05-25 03:35:40 | MASTER-SAAO | (02h 17m 00.60s , -16d 07m 29.4s) | C | 180 | 17.9 |\n 3534 | 2023-05-25 03:35:40 | MASTER-SAAO | (02h 16m 11.96s , -16d 07m 22.9s) | C | 180 | 19.0 |\n 3677 | 2023-05-25 03:38:04 | MASTER-OAFA | (12h 31m 12.04s , +33d 29m 39.5s) | C | 180 | 16.6 |\n 3755 | 2023-05-25 03:39:22 | MASTER-SAAO | (02h 24m 24.94s , -16d 08m 09.9s) | C | 180 | 18.7 |\n 3755 | 2023-05-25 03:39:22 | MASTER-SAAO | (02h 25m 13.51s , -16d 08m 17.5s) | C | 180 | 17.8 |\n 3888 | 2023-05-25 03:41:35 | MASTER-OAFA | (12h 36m 02.18s , +20d 10m 54.2s) | C | 180 | 18.6 |\n 3974 | 2023-05-25 03:43:00 | MASTER-SAAO | (02h 06m 20.69s , -23d 44m 15.3s) | C | 180 | 19.3 |\n 3974 | 2023-05-25 03:43:00 | MASTER-SAAO | (02h 07m 11.92s , -23d 44m 23.4s) | C | 180 | 19.2 |\n 4100 | 2023-05-25 03:45:06 | MASTER-OAFA | (12h 44m 35.10s , +20d 12m 03.0s) | C | 180 | 18.7 |\n 4186 | 2023-05-25 03:46:32 | MASTER-SAAO | (02h 15m 52.05s , -23d 42m 56.5s) | C | 180 | 19.1 |\n 4186 | 2023-05-25 03:46:32 | MASTER-SAAO | (02h 15m 00.85s , -23d 42m 47.9s) | C | 180 | 19.3 |\n 4311 | 2023-05-25 03:48:37 | MASTER-OAFA | (14h 03m 18.48s , +24d 00m 03.2s) | C | 180 | 19.0 |\n 5266 | 2023-05-25 04:04:33 | MASTER-SAAO | (02h 16m 06.18s , -16d 08m 23.9s) | C | 180 | 18.9 |\n 5266 | 2023-05-25 04:04:33 | MASTER-SAAO | (02h 16m 55.75s , -16d 09m 00.6s) | C | 180 | 19.0 |\n 5434 | 2023-05-25 04:07:21 | MASTER-OAFA | (14h 12m 11.39s , +24d 00m 32.7s) | C | 180 | 18.8 |\n 5478 | 2023-05-25 04:08:04 | MASTER-SAAO | (02h 24m 29.19s , -16d 06m 41.4s) | C | 180 | 18.8 |\n 5478 | 2023-05-25 04:08:04 | MASTER-SAAO | (02h 25m 18.71s , -16d 07m 18.1s) | C | 180 | 18.6 |\n 5688 | 2023-05-25 04:11:35 | MASTER-SAAO | (02h 17m 25.73s , -18d 00m 48.4s) | C | 180 | 19.0 |\n 5688 | 2023-05-25 04:11:35 | MASTER-SAAO | (02h 18m 16.09s , -18d 01m 24.3s) | C | 180 | 19.1 |\n 5852 | 2023-05-25 04:14:18 | MASTER-OAFA | (14h 25m 23.79s , +25d 55m 13.8s) | C | 180 | 18.5 |\n 5900 | 2023-05-25 04:15:06 | MASTER-SAAO | (02h 25m 57.75s , -18d 01m 35.3s) | C | 180 | 18.8 |\n 5900 | 2023-05-25 04:15:06 | MASTER-SAAO | (02h 26m 48.12s , -18d 02m 11.2s) | C | 180 | 18.8 |\n 6063 | 2023-05-25 04:17:50 | MASTER-OAFA | (13h 59m 37.93s , +25d 54m 44.7s) | C | 180 | 18.7 |\n 6111 | 2023-05-25 04:18:38 | MASTER-SAAO | (01h 59m 13.02s , -14d 15m 19.5s) | C | 180 | 19.1 |\n 6111 | 2023-05-25 04:18:38 | MASTER-SAAO | (02h 00m 02.68s , -14d 15m 54.8s) | C | 180 | 19.1 |\n 6274 | 2023-05-25 04:21:21 | MASTER-OAFA | (14h 08m 26.92s , +25d 53m 57.8s) | C | 180 | 18.7 |\n 6323 | 2023-05-25 04:22:09 | MASTER-SAAO | (02h 07m 25.60s , -14d 13m 16.4s) | C | 180 | 18.6 |\n 6323 | 2023-05-25 04:22:09 | MASTER-SAAO | (02h 08m 15.27s , -14d 13m 51.2s) | C | 180 | 18.6 |\n 6485 | 2023-05-25 04:24:52 | MASTER-OAFA | (14h 16m 26.88s , +25d 54m 59.9s) | C | 180 | 18.5 |\n 6534 | 2023-05-25 04:25:41 | MASTER-SAAO | (02h 18m 19.40s , -18d 03m 28.0s) | C | 180 | 17.9 |\n 6534 | 2023-05-25 04:25:41 | MASTER-SAAO | (02h 17m 28.63s , -18d 02m 53.1s) | C | 180 | 18.0 |\n 6696 | 2023-05-25 04:28:23 | MASTER-OAFA | (14h 25m 26.72s , +25d 54m 02.1s) | C | 180 | 18.4 |\n 6745 | 2023-05-25 04:29:12 | MASTER-SAAO | (02h 26m 46.18s , -18d 01m 40.3s) | C | 180 | 17.5 |\n 6745 | 2023-05-25 04:29:12 | MASTER-SAAO | (02h 25m 55.48s , -18d 01m 05.6s) | C | 180 | 17.5 |\n 6908 | 2023-05-25 04:31:54 | MASTER-OAFA | (13h 59m 31.04s , +25d 52m 20.9s) | C | 180 | 18.6 |\n 6957 | 2023-05-25 04:32:43 | MASTER-SAAO | (01h 59m 56.13s , -14d 15m 03.2s) | C | 180 | 17.5 |\n 6957 | 2023-05-25 04:32:43 | MASTER-SAAO | (01h 59m 06.14s , -14d 14m 29.1s) | C | 180 | 17.5 |\n 7413 | 2023-05-25 04:40:20 | MASTER-OAFA | (13h 46m 42.34s , +23d 58m 01.7s) | C | 180 | 18.8 |\n 7625 | 2023-05-25 04:43:51 | MASTER-OAFA | (13h 55m 30.53s , +23d 59m 46.2s) | C | 180 | 19.0 |\n 7836 | 2023-05-25 04:47:22 | MASTER-OAFA | (13h 56m 34.28s , +27d 47m 41.6s) | C | 180 | 18.3 |\n 8047 | 2023-05-25 04:50:54 | MASTER-OAFA | (14h 05m 41.65s , +27d 46m 45.7s) | C | 180 | 18.4 |\n 8259 | 2023-05-25 04:54:25 | MASTER-OAFA | (13h 46m 39.93s , +23d 57m 09.0s) | C | 180 | 18.9 |\n 8469 | 2023-05-25 04:57:56 | MASTER-OAFA | (13h 55m 32.43s , +23d 57m 28.7s) | C | 180 | 18.8 |\n 8848 | 2023-05-25 05:04:14 | MASTER-OAFA | (14h 05m 39.55s , +27d 45m 18.6s) | C | 180 | 18.3 |\n 9059 | 2023-05-25 05:07:46 | MASTER-OAFA | (14h 13m 45.65s , +27d 46m 15.7s) | C | 180 | 18.4 |\n 9403 | 2023-05-25 05:13:29 | MASTER-OAFA | (14h 07m 54.50s , +22d 02m 50.9s) | C | 180 | 18.7 |\n 9614 | 2023-05-25 05:17:01 | MASTER-OAFA | (14h 16m 38.26s , +22d 03m 17.7s) | C | 180 | 18.7 |\n 9990 | 2023-05-25 05:23:16 | MASTER-OAFA | (14h 22m 51.67s , +27d 45m 02.4s) | C | 180 | 18.4 |\n 10201 | 2023-05-25 05:26:48 | MASTER-OAFA | (14h 07m 59.53s , +22d 04m 05.9s) | C | 180 | 18.7 |\n 10412 | 2023-05-25 05:30:19 | MASTER-OAFA | (14h 16m 31.76s , +22d 03m 23.0s) | C | 180 | 18.5 |\n 10784 | 2023-05-25 05:36:31 | MASTER-OAFA | (14h 09m 12.65s , +08d 43m 53.9s) | C | 180 | 18.6 |\n 10996 | 2023-05-25 05:40:02 | MASTER-OAFA | (14h 12m 39.16s , +06d 51m 42.6s) | C | 180 | 18.8 |\n 11489 | 2023-05-25 05:48:15 | MASTER-OAFA | (14h 01m 13.70s , +08d 44m 59.5s) | C | 180 | 18.4 |\n 11700 | 2023-05-25 05:51:46 | MASTER-OAFA | (14h 09m 13.31s , +08d 44m 17.3s) | C | 180 | 18.6 |\n 11911 | 2023-05-25 05:55:17 | MASTER-OAFA | (14h 12m 36.61s , +06d 51m 12.9s) | C | 180 | 18.8 |\n 12122 | 2023-05-25 05:58:48 | MASTER-OAFA | (14h 20m 45.87s , +06d 50m 15.1s) | C | 180 | 18.7 |\n 12333 | 2023-05-25 06:02:20 | MASTER-OAFA | (14h 16m 35.91s , +08d 43m 26.2s) | C | 180 | 18.5 |\n 12544 | 2023-05-25 06:05:51 | MASTER-OAFA | (14h 24m 39.46s , +08d 44m 54.7s) | C | 180 | 18.7 |\n 12758 | 2023-05-25 06:09:24 | MASTER-OAFA | (00h 34m 20.55s , -42d 51m 07.8s) | C | 180 | 18.4 |\n 12972 | 2023-05-25 06:12:58 | MASTER-OAFA | (00h 44m 33.61s , -42d 12m 13.5s) | C | 180 | 17.3 |\n 15091 | 2023-05-25 06:48:17 | MASTER-OAFA | (15h 26m 32.57s , -20d 13m 24.4s) | C | 180 | 19.0 |\n 15302 | 2023-05-25 06:51:48 | MASTER-OAFA | (15h 47m 28.65s , -23d 57m 29.0s) | C | 180 | 18.9 |\n 20013 | 2023-05-25 08:10:19 | MASTER-OAFA | (19h 51m 20.60s , -56d 58m 44.9s) | C | 180 | 19.2 |\n 20442 | 2023-05-25 08:17:28 | MASTER-OAFA | (19h 28m 02.35s , -49d 33m 55.8s) | C | 180 | 19.1 |\n 20653 | 2023-05-25 08:21:00 | MASTER-OAFA | (20h 20m 36.04s , -58d 44m 06.1s) | C | 180 | 19.1 |\n 21018 | 2023-05-25 08:27:05 | MASTER-OAFA | (17h 50m 13.51s , -58d 03m 11.3s) | C | 180 | 12.1 |\n 21454 | 2023-05-25 08:34:21 | MASTER-OAFA | (21h 04m 21.63s , -61d 18m 52.7s) | C | 180 | 19.2 |\n 21871 | 2023-05-25 08:41:18 | MASTER-OAFA | (21h 50m 49.44s , -68d 17m 52.1s) | C | 180 | 19.1 |\n 22083 | 2023-05-25 08:44:49 | MASTER-OAFA | (22h 43m 57.70s , -77d 52m 52.1s) | C | 180 | 19.2 |\n 22294 | 2023-05-25 08:48:20 | MASTER-OAFA | (22h 44m 28.42s , -85d 16m 10.6s) | C | 180 | 19.0 |\n 22505 | 2023-05-25 08:51:52 | MASTER-OAFA | (22h 40m 38.85s , -85d 03m 07.4s) | C | 180 | 18.7 |\n 23471 | 2023-05-25 09:07:57 | MASTER-OAFA | (02h 26m 21.41s , -18d 07m 31.3s) | C | 180 | 17.9 |\n 23858 | 2023-05-25 09:14:24 | MASTER-OAFA | (21h 17m 32.92s , +00d 04m 04.7s) | C | 180 | 19.3 |\n 24070 | 2023-05-25 09:17:56 | MASTER-OAFA | (02h 24m 58.98s , -16d 15m 14.3s) | C | 180 | 17.6 |\n 24281 | 2023-05-25 09:21:27 | MASTER-OAFA | (21h 17m 35.75s , +00d 05m 43.6s) | C | 180 | 19.3 |\n 24461 | 2023-05-25 09:21:27 | MASTER-OAFA | (21h 17m 35.74s , +00d 05m 43.5s) | C | 540 | 19.9 | Coadd\n 24644 | 2023-05-25 09:27:31 | MASTER-OAFA | (02h 18m 06.21s , -18d 07m 14.8s) | C | 180 | 17.7 |\n 24856 | 2023-05-25 09:31:02 | MASTER-OAFA | (02h 26m 23.27s , -18d 07m 51.9s) | C | 180 | 17.6 |\n 25660 | 2023-05-25 09:44:27 | MASTER-OAFA | (21h 17m 31.31s , +00d 03m 12.7s) | C | 180 | 19.2 |\n 25804 | 2023-05-25 09:48:20 | MASTER-OAFA | (00h 03m 19.98s , -00d 08m 42.6s) | C | -1 | 14.0 |\n 25868 | 2023-05-25 09:49:25 | MASTER-OAFA | (00h 03m 15.90s , -00d 06m 48.1s) | C | -1 | 17.1 |\n 25991 | 2023-05-25 09:49:57 | MASTER-OAFA | (21h 17m 37.54s , +00d 04m 01.6s) | C | 180 | 19.2 |\n 26133 | 2023-05-25 09:53:50 | MASTER-OAFA | (00h 03m 20.08s , -00d 06m 54.0s) | C | -1 | 14.9 |\n 26289 | 2023-05-25 09:54:55 | MASTER-OAFA | (21h 17m 32.66s , +00d 03m 55.0s) | C | 180 | 17.5 |\n 26262 | 2023-05-25 09:55:59 | MASTER-OAFA | (23h 55m 15.83s , -00d 08m 56.4s) | C | -1 | 17.7 |\n 26327 | 2023-05-25 09:57:03 | MASTER-OAFA | (23h 55m 19.45s , -00d 07m 12.9s) | C | -1 | 17.7 |\n 26392 | 2023-05-25 09:58:08 | MASTER-OAFA | (23h 55m 22.74s , -00d 07m 25.3s) | C | -1 | 17.6 |\n 26456 | 2023-05-25 09:59:13 | MASTER-OAFA | (23h 55m 23.57s , -00d 07m 58.4s) | C | -1 | 17.7 |\n 26612 | 2023-05-25 10:00:18 | MASTER-OAFA | (21h 17m 39.75s , +00d 02m 54.4s) | C | 180 | 17.5 |\n 26589 | 2023-05-25 10:01:25 | MASTER-OAFA | (00h 03m 23.33s , -00d 07m 01.9s) | C | -1 | 17.6 |\n 26711 | 2023-05-25 10:01:58 | MASTER-OAFA | (02h 00m 21.16s , -14d 14m 35.0s) | C | 180 | 17.0 |\n 26923 | 2023-05-25 10:05:29 | MASTER-OAFA | (02h 08m 39.75s , -14d 15m 53.4s) | C | 180 | 16.5 |\n 27135 | 2023-05-25 10:09:01 | MASTER-OAFA | (01h 59m 42.72s , -12d 20m 56.3s) | C | 180 | 17.5 |\n 27278 | 2023-05-25 10:12:55 | MASTER-OAFA | (00h 03m 20.32s , -00d 08m 49.6s) | C | -1 | 15.2 |\n 27342 | 2023-05-25 10:13:58 | MASTER-OAFA | (00h 03m 17.79s , -00d 08m 00.3s) | C | -1 | 17.5 |\n 27404 | 2023-05-25 10:15:01 | MASTER-OAFA | (00h 03m 23.58s , -00d 07m 58.6s) | C | -1 | 17.4 |\n 27469 | 2023-05-25 10:16:05 | MASTER-OAFA | (00h 03m 23.05s , -00d 08m 53.1s) | C | -1 | 16.9 |\n 27534 | 2023-05-25 10:17:10 | MASTER-OAFA | (00h 03m 20.02s , -00d 08m 49.9s) | C | -1 | 16.9 |\n 28122 | 2023-05-25 10:25:29 | MASTER-OAFA | (02h 08m 50.56s , -14d 12m 37.1s) | C | 180 | 16.5 |\n 28480 | 2023-05-25 10:32:57 | MASTER-OAFA | (00h 03m 17.26s , -00d 08m 16.0s) | C | -1 | 15.5 |\n 28546 | 2023-05-25 10:34:02 | MASTER-OAFA | (00h 03m 23.06s , -00d 08m 13.6s) | C | -1 | 15.9 |\n 28611 | 2023-05-25 10:35:07 | MASTER-OAFA | (00h 03m 23.23s , -00d 09m 07.4s) | C | -1 | 15.8 |\n 29048 | 2023-05-25 10:42:24 | MASTER-OAFA | (00h 03m 17.87s , -00d 07m 22.7s) | C | -1 | 14.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-27T15:28:35.128809Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-27T15:28:35.128841Z",
"modified": "2023-05-27T15:28:35.140900Z",
"nonlocalizedevents": [
{
"event_id": "S230525a"
}
],
"targets": []
},
{
"id": 1334,
"topic": "gcn.circular",
"uuid": "e9f2fe89-6540-4773-9ea3-735eca02845c",
"title": "Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "23/07/18 02:43:26 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"title": "GCN CIRCULAR",
"number": "34224",
"subject": "Fermi Gamma-ray Burst Monitor trigger 711329677/230717982 is not a GRB"
},
"message_text": "C. Fletcher (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 711329677/230717982 at 23:34:32.98 UT\non 17 July 2023, tentatively classified as a GRB, is in fact not due\nto a GRB. This trigger is likely due to a Solar Flare.\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg5NjQ4MjExLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.0gWNUTSpMcg203R6eIhoiBab8FzgTpyxfg9elOkR2KQ\n\n",
"published": "2023-07-18T02:43:36.394032Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-18T02:43:36.394063Z",
"modified": "2023-07-18T02:43:36.404512Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 66,
"topic": "gcn.circular",
"uuid": "986f91b4-2f3a-44e2-bbd2-365cc93c6642",
"title": "IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event",
"submitter": "Hop gcn.circular",
"authors": "Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>",
"data": {
"date": "23/05/24 13:50:23 GMT",
"from": "Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>",
"title": "GCN CIRCULAR",
"number": "33870",
"subject": "IceCube-230524A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-05-24 at 11:09:36.24 UT IceCube detected a track-like event\nwith a moderate probability of being of astrophysical origin. \nThe event was selected by the ICECUBE_Astrotrack_Bronze alert stream.\nThe average astrophysical neutrino purity Bronze alerts is 30%.\n\nThis alert has an estimated false alarm rate of 4.25 events per year\ndue to atmospheric backgrounds. The IceCube detector was in a normal\noperating state at the time of detection.\n\nAfter the initial automated alert\n(https://gcn.gsfc.nasa.gov/notices_amon_g_b/137971_11526243.amon), more\nsophisticated reconstruction algorithms have been applied offline, with\nthe direction refined to:\n\nDate: 2023-05-24\nTime: 11:09:36.24 UT\nRA: 318.43 (+3.12 / -2.59 deg 90% PSF containment) J2000\nDec: +2.84 (+2.55 / -2.43 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help\nidentify a possible astrophysical source for the candidate neutrino.\n\nTwo gamma-ray sources listed in the 4FGL Fermi-LAT catalog are located\nwithin the 90% uncertainty region. The sources are 4FGL J2110.3+0404\nand 4FGL J2109.6+0440 located 1.50 and 2.10 deg away from the best-fit\nposition, respectively.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector\noperating at the geographic South Pole, Antarctica.\n\nThe IceCube realtime alert point of contact can be reached at\nroc@icecube.wisc.edu\n\n\n",
"published": "2023-05-24T13:50:32.663081Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T13:50:32.663113Z",
"modified": "2023-05-24T13:50:32.668879Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 70,
"topic": "gcn.circular",
"uuid": "02a0bb93-8f9b-473a-a915-974c0595d78a",
"title": "LIGO/Virgo/KAGRA S230524x: Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"data": {
"date": "23/05/24 20:50:40 GMT",
"from": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"title": "GCN CIRCULAR",
"number": "33871",
"subject": "LIGO/Virgo/KAGRA S230524x: Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S230524x is no longer considered to be a candidate of interest. This candidate included at least one detection prior to the merger time but no significant detections that included the merger, which indicates this candidate is likely a noise transient.\n\n",
"published": "2023-05-24T20:50:52.802408Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-24T20:50:52.802427Z",
"modified": "2023-05-24T20:50:52.807077Z",
"nonlocalizedevents": [
{
"event_id": "S230524x"
}
],
"targets": []
},
{
"id": 74,
"topic": "gcn.circular",
"uuid": "74651575-411e-411c-935b-1e2d2f6f99dd",
"title": "LIGO/Virgo/KAGRA S230518h: No transient candidates in CALET observations",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/05/25 06:39:10 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "33872",
"subject": "LIGO/Virgo/KAGRA S230518h: No transient candidates in CALET observations"
},
"message_text": "A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR),\nS. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu,\nT. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger\ntime of S230518h T0 = 2023-05-18T12:59:08 UT (GCN33813,33816).\n\nNo CGBM onboard trigger occurred around the event time. Based on the\nupdate sky map, the summed probabilities inside the CGBM HXM (7 - 3000 keV)\nand SGM (40 keV - 28 MeV) fields of view\nare 0 % and 65 %, respectively (and 76 % credible regions of the\nupdate sky map was above the horizon). The HXM and SGM fields of\nview were centered at RA = 152 deg, Dec = +50 deg and RA = 161\ndeg, Dec = +42 deg at T0, respectively.\n\nBased on the analysis of the light curve data with 0.125 sec time\nresolution from T0-60 sec to T0+60 sec, we found no significant\nexcess (> 7 sigmas) around the trigger time in either the HXM or the SGM data.\n\nThe preliminary CGBM analysis is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/O4/S230518h\n\nThe CALET Calorimeter (CAL) was operating in the high energy trigger\nmode at the trigger time of S230518h. Using the CAL data, we searched\nfor gamma-ray events in the 10-100 GeV band from -60 sec\nto +60 sec from the GW trigger time and found no candidates. There\nwas no significant overlap with the LVK high probability localization\nregion at T0+-60 sec. The CAL FOV was centered at RA = 161 deg,\nDec= +42 deg at T0.\n\nThe preliminary CGBM analysis for O4 events can be found here:\nhttp://cgbm.calet.jp/cgbm_trigger/O4\n\n",
"published": "2023-05-25T06:39:19.783206Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T06:39:19.783226Z",
"modified": "2023-05-25T06:39:19.791474Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 75,
"topic": "gcn.circular",
"uuid": "2acfe7eb-e36d-49b4-8014-98f1ff7c186c",
"title": "IceCube Alert 230524.47: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/25 07:13:25 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33873",
"subject": "IceCube Alert 230524.47: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the IceCube Alert 230524.47 (trigger No 11526243,21h 16m 02.16s , +02d 57m 32.4s, R=1.12) errorbox 46133 sec after notice time and 46181 sec after trigger time at 2023-05-24 23:59:17 UT, with upper limit up to 20.1 mag. The observations began at zenith distance = 62 deg. The sun altitude is -68.2 deg.\n\nThe galactic latitude b = -30 deg., longitude l = 55 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"19004\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 46271 | 2023-05-24 23:59:17 | MASTER-SAAO | (21h 05m 12.01s , +02d 17m 31.9s) | C | 180 | 19.0 |\n 46451 | 2023-05-24 23:59:17 | MASTER-SAAO | (21h 05m 12.01s , +02d 17m 31.9s) | C | 540 | 20.0 | Coadd\n 46271 | 2023-05-24 23:59:17 | MASTER-SAAO | (21h 04m 24.13s , +02d 17m 57.8s) | C | 180 | 19.1 |\n 46451 | 2023-05-24 23:59:17 | MASTER-SAAO | (21h 04m 24.13s , +02d 17m 57.8s) | C | 540 | 20.0 | Coadd\n 46492 | 2023-05-25 00:02:57 | MASTER-SAAO | (21h 05m 09.15s , +02d 18m 40.8s) | C | 180 | 19.6 |\n 46492 | 2023-05-25 00:02:57 | MASTER-SAAO | (21h 04m 21.21s , +02d 19m 04.9s) | C | 180 | 19.5 |\n 46697 | 2023-05-25 00:06:23 | MASTER-SAAO | (21h 05m 09.15s , +02d 17m 39.5s) | C | 180 | 19.5 |\n 46697 | 2023-05-25 00:06:23 | MASTER-SAAO | (21h 04m 21.15s , +02d 18m 03.5s) | C | 180 | 19.3 |\n 46909 | 2023-05-25 00:09:54 | MASTER-SAAO | (21h 16m 06.41s , +04d 49m 49.5s) | C | 180 | 19.5 |\n 47089 | 2023-05-25 00:09:54 | MASTER-SAAO | (21h 16m 06.43s , +04d 49m 49.4s) | C | 540 | 20.1 | Coadd\n 46909 | 2023-05-25 00:09:54 | MASTER-SAAO | (21h 15m 18.55s , +04d 50m 16.3s) | C | 180 | 19.4 |\n 47089 | 2023-05-25 00:09:54 | MASTER-SAAO | (21h 15m 18.57s , +04d 50m 16.3s) | C | 540 | 19.9 | Coadd\n 47119 | 2023-05-25 00:13:25 | MASTER-SAAO | (21h 15m 58.74s , +04d 49m 13.0s) | C | 180 | 19.5 |\n 47119 | 2023-05-25 00:13:25 | MASTER-SAAO | (21h 15m 10.93s , +04d 49m 38.4s) | C | 180 | 19.4 |\n 47330 | 2023-05-25 00:16:56 | MASTER-SAAO | (21h 15m 59.23s , +04d 50m 11.0s) | C | 180 | 19.2 |\n 47330 | 2023-05-25 00:16:56 | MASTER-SAAO | (21h 15m 11.27s , +04d 50m 37.0s) | C | 180 | 19.0 |\n 47542 | 2023-05-25 00:20:27 | MASTER-SAAO | (21h 16m 59.92s , -00d 00m 32.3s) | C | 180 | 19.5 |\n 47722 | 2023-05-25 00:20:27 | MASTER-SAAO | (21h 16m 59.93s , -00d 00m 32.3s) | C | 540 | 20.1 | Coadd\n 47542 | 2023-05-25 00:20:27 | MASTER-SAAO | (21h 16m 11.91s , -00d 00m 06.3s) | C | 180 | 19.4 |\n 47722 | 2023-05-25 00:20:27 | MASTER-SAAO | (21h 16m 11.92s , -00d 00m 06.3s) | C | 540 | 20.0 | Coadd\n 47753 | 2023-05-25 00:23:59 | MASTER-SAAO | (21h 16m 06.06s , -00d 01m 06.7s) | C | 180 | 19.4 |\n 47753 | 2023-05-25 00:23:59 | MASTER-SAAO | (21h 16m 54.07s , -00d 01m 33.0s) | C | 180 | 19.5 |\n 47965 | 2023-05-25 00:27:31 | MASTER-SAAO | (21h 17m 00.90s , -00d 01m 26.3s) | C | 180 | 19.4 |\n 47965 | 2023-05-25 00:27:31 | MASTER-SAAO | (21h 16m 12.82s , -00d 00m 59.8s) | C | 180 | 19.2 |\n 48816 | 2023-05-25 00:41:42 | MASTER-SAAO | (21h 24m 08.69s , +04d 27m 32.1s) | C | 180 | 19.2 |\n 48996 | 2023-05-25 00:41:42 | MASTER-SAAO | (21h 24m 08.67s , +04d 27m 32.1s) | C | 540 | 20.0 | Coadd\n 48816 | 2023-05-25 00:41:42 | MASTER-SAAO | (21h 23m 20.63s , +04d 28m 00.9s) | C | 180 | 19.2 |\n 48996 | 2023-05-25 00:41:42 | MASTER-SAAO | (21h 23m 20.62s , +04d 28m 00.9s) | C | 540 | 19.9 | Coadd\n 49029 | 2023-05-25 00:45:15 | MASTER-SAAO | (21h 24m 08.32s , +04d 28m 32.4s) | C | 180 | 19.3 |\n 49029 | 2023-05-25 00:45:15 | MASTER-SAAO | (21h 23m 20.18s , +04d 29m 01.1s) | C | 180 | 19.2 |\n 49241 | 2023-05-25 00:48:47 | MASTER-SAAO | (21h 24m 14.10s , +04d 27m 32.3s) | C | 180 | 19.1 |\n 49241 | 2023-05-25 00:48:47 | MASTER-SAAO | (21h 23m 25.87s , +04d 28m 01.6s) | C | 180 | 19.1 |\n 49451 | 2023-05-25 00:52:17 | MASTER-SAAO | (21h 22m 22.89s , +05d 20m 21.5s) | C | 180 | 19.4 |\n 49631 | 2023-05-25 00:52:17 | MASTER-SAAO | (21h 22m 22.90s , +05d 20m 21.5s) | C | 540 | 20.1 | Coadd\n 49451 | 2023-05-25 00:52:17 | MASTER-SAAO | (21h 21m 34.55s , +05d 20m 51.0s) | C | 180 | 19.3 |\n 49631 | 2023-05-25 00:52:17 | MASTER-SAAO | (21h 21m 34.56s , +05d 20m 51.0s) | C | 540 | 20.0 | Coadd\n 49662 | 2023-05-25 00:55:48 | MASTER-SAAO | (21h 22m 30.22s , +05d 20m 46.5s) | C | 180 | 19.1 |\n 49662 | 2023-05-25 00:55:48 | MASTER-SAAO | (21h 21m 41.79s , +05d 21m 15.9s) | C | 180 | 19.0 |\n 49875 | 2023-05-25 00:59:21 | MASTER-SAAO | (21h 22m 26.62s , +05d 22m 15.4s) | C | 180 | 19.4 |\n 49875 | 2023-05-25 00:59:21 | MASTER-SAAO | (21h 21m 38.15s , +05d 22m 45.3s) | C | 180 | 19.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-25T07:13:35.901396Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T07:13:35.901417Z",
"modified": "2023-05-25T07:13:35.906786Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 76,
"topic": "gcn.circular",
"uuid": "d6ad08d8-5bff-4a1e-8057-7c2e9d56830e",
"title": "GRB 230524A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Andreas von Kienlin at MPE <azk@mpe.mpg.de>",
"data": {
"date": "23/05/25 10:00:14 GMT",
"from": "Andreas von Kienlin at MPE <azk@mpe.mpg.de>",
"title": "GCN CIRCULAR",
"number": "33874",
"subject": "GRB 230524A: Fermi GBM Observation"
},
"message_text": "A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 06:06:35 UT on 24 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230524A (trigger 706601200/230524255),\nwhich was also detected by AGILE (Panebianco et al. 2023, GCN 33867)\nand AstroSAT/CZTI (Navaneeth et al. 2022, GCN 33868).\nThe Fermi GBM Final Real-time Localization was reported in GCN 33864.\n\nThe GBM light curve consists of a single emission with a duration (T90)\nof about 35 s (50-300 keV). The time-averaged spectrum\nfrom T0-2.0 to T0+36.9 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.99 +/- 0.04 and the cutoff energy,\nparameterized as Epeak, is 1632 +/- 415 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.58 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-2 s in the 10-1000 keV band is 2.7 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n",
"published": "2023-05-25T10:00:23.410177Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T10:00:23.410200Z",
"modified": "2023-05-25T10:00:23.417445Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 567,
"topic": "gcn.circular",
"uuid": "9f439fdc-3e7d-44d3-8b93-172256a4fd38",
"title": "GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOVÂ ",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/06/24 14:51:09 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34076",
"subject": "GRB 230623B: Swift/BAT-GUANO detection of a long burst outside the coded FOVÂ "
},
"message_text": "Samuele Ronchini (PSU), James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: \n\nSwift/BAT did not localize GRB 230623B onboard (T0: 2023-06-23T21:22:34.5 UTC, GECAM trig 195).\n\nThe GECAM notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). \n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. \n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 19.53 in a 8.192 s analysis time bin. \n\nNITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -28.84.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. \n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. \n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3NjE4Mjc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.oRcHDIJZdpzw7mn1lvfAC4FIoWWovXJI-9kZ5Dd29v8\n\n",
"published": "2023-06-24T14:51:24.923739Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-24T14:51:24.923758Z",
"modified": "2023-06-24T14:51:24.928757Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 78,
"topic": "gcn.circular",
"uuid": "659dcec6-0f0f-49ed-8da6-4ec818c3d896",
"title": "IceCube-230524A: Upper limits from a search for additional neutrino events in IceCube",
"submitter": "Hop gcn.circular",
"authors": "Aswathi Balagopal V. at UW-Madison/IceCube <abalagopalv@icecube.wisc.edu>",
"data": {
"date": "23/05/25 13:54:12 GMT",
"from": "Aswathi Balagopal V. at UW-Madison/IceCube <abalagopalv@icecube.wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33876",
"subject": "IceCube-230524A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-230524A (https://gcn.gsfc.nasa.gov/gcn3/0.gcn3) in a time range of 1000 seconds centered on the alert event time (2023-05-24 11:01:16.240 UTC to 2023-05-24 11:17:56.240 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-230524A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-230524A ranges from 1.4e-01 to 1.5e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 3e+02 GeV and 2e+05 GeV.\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2023-05-23 11:09:36.240 UTC to 2023-05-25 11:09:36.240 UTC). In this case, we report a p-value of 1.00, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-230524A is 1.6e-01 GeV cm^-2 in a 2 day time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can\nbe reached at roc@icecube.wisc.edu.\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n",
"published": "2023-05-25T13:54:22.058264Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T13:54:22.058293Z",
"modified": "2023-05-25T13:54:22.064908Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 79,
"topic": "gcn.circular",
"uuid": "e734313b-031a-4f89-97c2-3ec76eca2959",
"title": "GRB 230525A: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "23/05/25 14:54:44 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"title": "GCN CIRCULAR",
"number": "33877",
"subject": "GRB 230525A: Fermi GBM Final Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\n\"At 10:46:08 UT on 25 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230525A (trigger 706704373/230525449).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 45.27, Dec = 69.35 (J2000 degrees, equivalent to J2000 3h 1m, +69d 20'),\nwith a statistical uncertainty of 6.75 degrees.\n\nThe angle from the Fermi LAT boresight is 19 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230525449/quicklook/glg_skymap_all_bn230525449.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230525449/quicklook/glg_healpix_all_bn230525449.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230525449/quicklook/glg_lc_medres34_bn230525449.gif\"\n\n",
"published": "2023-05-25T14:54:55.921342Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T14:54:55.921362Z",
"modified": "2023-05-25T14:54:55.927823Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 80,
"topic": "gcn.circular",
"uuid": "baa8ab09-021b-46a3-a638-6bf4d86a0de4",
"title": "LIGO/Virgo/KAGRA S230518h: TESS observations of the localization region",
"submitter": "Hop gcn.circular",
"authors": "Rahul Jayaraman at MIT <rjayaram@mit.edu>",
"data": {
"date": "23/05/25 16:37:21 GMT",
"from": "Rahul Jayaraman at MIT <rjayaram@mit.edu>",
"title": "GCN CIRCULAR",
"number": "33878",
"subject": "LIGO/Virgo/KAGRA S230518h: TESS observations of the localization region"
},
"message_text": "R. Jayaraman, M.M. Fausnaugh, G. Mo, E. Katsavounidis, R. Vanderspek, G.R. Ricker (MIT) report:\n\nWe report observations by the Transiting Exoplanet Survey Satellite (TESS) of the Bilby sky localization region from the LVK NSBH merger event S230518h (GCN 33813, 33816; LVK collaboration), the Swope candidates presented in GCN 33829 (Coulter et al.), and the MeerLICHT candidates presented in Astronote 2023-121 (Johnston et al.). TESS has a field-of-view of 2304 deg^2, a plate scale of 21 arcseconds per pixel, and a passband between 600 and 1000 nm. TESS images its entire field of view every 200 seconds.\n\nWe used the techniques described in Mo et al. (ApJL 948 L3, 2023) to calculate an overlap between the TESS field of view and the gravitational-wave (GW) localization sky map. 15.3% of the Bilby sky localization probability fell within TESS cameras 3 and 4. TESS was observing its pre-determined fields of view for Sector 65 (https://tess.mit.edu/tess-year-5-observations/) beginning ~6.8 days prior to the LVK trigger. Observations continued until 11 hours after the time of the trigger, at which time a scheduled TESS data downlink via the Deep Space Network commenced. TESS full frame images (FFIs) were then calibrated using the TICA software package (Fausnaugh et al. RNAAS 4 251, 2020) and subsequently became public on MAST ~36 hours after downlink. Shortly after the TICA data became public at MAST, we commenced analysis of the TESS FFIs. \n\nThe Earth rose above TESSâs sun shade limits at 2023-05-10 04:23 UTC, and set below the sun shade limits at 2023-05-18 13:30 UTC, which was 32 minutes after the GW trigger. Earthshine during these times introduces strong scattered light signals in the TESS images, which manifests as a time-variable background that complicates our analysis.\n\nUsing reference images from before the GW trigger, we performed difference imaging on the TESS images. We extracted differential light curves for 10,343 galaxies at distances between 200 and 400 Mpc from the GLADE+ catalog (Dálya et al. MNRAS 514 1 1403â1411, 2022) that lie within the GW sky localization. Comparing the flux in each light curve during the 4 days prior to the GW trigger with the flux during the 11 hours after the trigger, we find 40 light curves with a nominal 7-sigma difference. Visual inspection shows that these deviations are mainly caused by crowding of bright stars in the TESS photometric apertures, implying that these deviations are related to residual systematic errors in the photometry. Smaller deviations might still be candidates, but interpretation of these light curves is difficult due to the variable backgrounds from earthshine.\n\nThe three Swope candidates (GCN 33829, Coulter et al.) and two MeerLICHT candidates (Astronote 2023-121, Johnston et al.) lie within the TESS field of view. We extracted differential light curves for these candidates as well. The TESS light curves on 4-hour timescales are consistent with zero flux, implying the following 5-sigma upper limits on any transients from 6.8 days prior to 11 hours after the GW trigger:\n\nSwope Candidate | TESS magnitude limits\nSSS23a | >18.98\nSSS23b | >18.51\nSSS23c | >18.03\n\nMeerLICHT Candidate | TESS magnitude limits\nAT 2023iyb | >18.93\nAT 2023ixg | >17.38\n\nFor AT2023iyb, the TESS limit is consistent with the MeerLICHT measurement if the transient is relatively blue.\n\n",
"published": "2023-05-25T16:37:30.677330Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T16:37:30.677352Z",
"modified": "2023-05-25T16:37:30.683662Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 81,
"topic": "gcn.circular",
"uuid": "9efbdec5-6111-42b3-af75-3e4a509dfe1f",
"title": "GRB 230525A: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "23/05/25 17:10:06 GMT",
"from": "sumanbala2210@gmail.com",
"title": "GCN CIRCULAR",
"number": "33879",
"subject": "GRB 230525A: Fermi GBM Detection"
},
"message_text": "S. Bala (USRA), C. Fletcher (USRA), O.J. Roberts (NASA/MSFC) and C. Meegan (UAH)\n report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 10:46:08.33 UT on 25 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230525A (trigger 706704373/230525449).\nThe Fermi GBM Final Real-time Localization was reported in GCN 33877.\n\nThe angle from the Fermi LAT boresight is 19 degrees.\n\nThe GBM light curve consists of single peak with a duration (T90)\nof 0.12 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.06 to T0+0.06 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.80 +/- 0.09 and the cutoff energy,\nparameterized as Epeak, is 789 +/- 148 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(8.6 +/- 0.4)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0-0.064 s in the 10-1000 keV band is 25 +/- 1 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n",
"published": "2023-05-25T17:10:15.229874Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-25T17:10:15.229895Z",
"modified": "2023-05-25T17:10:15.235512Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 82,
"topic": "gcn.circular",
"uuid": "645b2d3f-7460-40df-bf58-2296987c9581",
"title": "GRB 230510A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"data": {
"date": "23/05/26 13:27:36 GMT",
"from": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33880",
"subject": "GRB 230510A: Swift-BAT refined analysis"
},
"message_text": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), R. A. J. Eyles-Ferris (U Leicester),\nH. A. Krimm (NSF), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n Using the data set from T-240 to T+349 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230510A (trigger #1167973)\n(Eyles-Ferris, et al., GCN Circ. 33752). The BAT ground-calculated position is\nRA, Dec = 318.138, 34.430 deg which is\n RA(J2000) = 21h 12m 33.2s\n Dec(J2000) = +34d 25' 49.8\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 100%.\n The mask-weighted light curve shows a precursor starting at T-150 s with\na duration of ~20 s. The bright main episode starts at T-10 s, peaks at\nT+15 s, and ends at T+60 s. T90 (15-350 keV) is 178.4 +- 6.9 sec\n(estimated error including systematics).\n The time-averaged spectrum from T-145.6 to T+56.8 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.60 +- 0.09. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+13.39 sec in the 15-150 keV band\nis 5.9 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n The results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1167973/BA/\n\n",
"published": "2023-05-26T13:27:45.372905Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-26T13:27:45.372926Z",
"modified": "2023-05-26T13:27:45.379678Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 83,
"topic": "gcn.circular",
"uuid": "cf9ff53a-eaf1-4432-bc36-74edff13977b",
"title": "LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations",
"submitter": "Hop gcn.circular",
"authors": "matthew.kerr@gmail.com",
"data": {
"date": "23/05/26 17:28:30 GMT",
"from": "matthew.kerr@gmail.com",
"title": "GCN CIRCULAR",
"number": "33881",
"subject": "LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations"
},
"message_text": "M. Kerr, J. E. Grove, C.C. Cheung, R. Woolf (Naval Research Laboratory) and A. Goldstein (USRA) report:\n\nThe compact binary merger candidate S230518h (event time, T0 = 2023-05-18 12:59:08.167 UTC) was identified by the LIGO Observatory (H1, L1) during its engineering run prior to the start of the O4 observing run (GCN 33813).\nThe Glowbug gamma-ray instrument [1,2], launched in March 2023, observed much of the sky to which a high probability for the candidate origin was assigned. Glowbug has an all-sky field-of-view limited only by earth occultation and large-scale structures on the International Space Station (ISS). At T0, the Glowbug boresight was pointed towards R.A., Dec. = 158, 59 deg. The probability peak for the candidate origin (R.A., Dec. = 96, -11 deg.) was thus 78 deg. below the Glowbug boresight and more than 30 deg. above the earth limb. In total, 81% of the 90% confidence counterpart region was unocculted by the earth.\n\nUsing 50-2000 keV data and representative three representative (soft, medium, and hard spectrum) GRB templates from [3], we searched for transient gamma-ray signals using maximum likelihood methods and found no plausible counterpart up to 30s before or after T0. We determined 3-sigma upper limits on the flux for a GRB originating at the probability peak (R.A., Dec. = 96, -11 deg.) by selecting data centered on T0 and integrating the posterior probability to determine the flux beyond which the tail probability is 0.27%. For various timescales and the three GRB spectral templates, these limits in units of 1e-7 erg/cm2/s are:\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 0.9 1.8 9.1\n1.024 s: 0.2 0.5 2.5\n8.192 s: 0.2 0.3 1.2\n\nThese results do not account for scattering or occultation by structures on the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n",
"published": "2023-05-26T17:28:44.792015Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-26T17:28:44.792053Z",
"modified": "2023-05-26T17:28:44.803505Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 84,
"topic": "gcn.circular",
"uuid": "e661392a-4a39-4265-96ab-79f71c8f0dbb",
"title": "Fermi-LAT gamma-ray observations of IceCube-230524A",
"submitter": "Hop gcn.circular",
"authors": "Sara Buson at GSFC/Fermi <sara.buson@gmail.com>",
"data": {
"date": "23/05/26 21:44:19 GMT",
"from": "Sara Buson at GSFC/Fermi <sara.buson@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33882",
"subject": "Fermi-LAT gamma-ray observations of IceCube-230524A"
},
"message_text": "J. Sinapius (DESY-Zeuthen), S. Garrappa (Ruhr-Universitaet Bochum) and S. Buson (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration:\nWe report an analysis of observations of the vicinity of the IC230524A high-energy neutrino event (GCN 33633) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2023-05-24 at 11:09:36.24 UT (T0) with J2000 position RA = 318.43 (+3.12, -2.59) deg, Decl. = +2.84 (+2.55, -2.43) deg (90% PSF containment). Five cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources are located within the 90% IC230524A localization region. These sources are 4FGL J2110.3+0404, at a distance of 1.5 deg from the IC best-fit position, 4FGL J2109.6+0440, at a distance of 2.1 deg, 4FGL J2122.5+0345, at a distance of 2.4 deg, 4FGL J2104.7+0108, at a distance of 2.8 deg, and 4FGL J2125.6+0458 at a distance of 3.7 deg. Based on a preliminary analysis of the LAT data over a month and day timescale prior T0, these objects are not significantly detected at gamma rays.\nWe searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC230524A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC230524A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 3.6e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2023-05-24 UTC), and < 3.7e-9 (<6.0e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\nWithin the 90% confidence localization of the neutrino, 2.3 deg offset from the best-fit IC230524A position, an excess of gamma rays, Fermi J2106.3+0125 was detected in an analysis of the ~14-years integrated LAT data (100 MeV - 1 TeV) prior to T0. This putative new source is detected at a statistical significance ~5 sigma (calculated following the prescription adopted in the Fourth Fermi-LAT catalog, The Fermi-LAT collaboration 2020, ApJS, 247, 33). Assuming a power-law spectrum, the excess has best-fit localization of RA = 316.58 deg, Decl. = 1.43 deg (95% containment radius = 0.13 deg) with best-fit spectral parameters, flux = (8.6 +/- 3.9)e-10 ph cm^-2 s^-1, index = 1.9 +/-0.1. In a preliminary analysis of the LAT data over one month prior to T0, Fermi J2106.3+0125 is not significantly detected. All values include the statistical uncertainty only.\n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact persons are S. Garrappa (simone.garrappa at ruhr-uni-bochum.de <http://ruhr-uni-bochum.de/>), J. Sinapius (jonas.sinapius at desy.de <http://desy.de/>) and S. Buson (sara.buson at uni-wuerzburg.de <http://uni-wuerzburg.de/>).\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.\n\n",
"published": "2023-05-26T21:44:27.677098Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-26T21:44:27.677119Z",
"modified": "2023-05-26T21:44:27.683082Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 132,
"topic": "gcn.circular",
"uuid": "7ee22acb-309a-4cdd-848a-e0ada253b93f",
"title": "GRB 230522A: GRBAlpha and VZLUSAT-2 joint detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/06/02 16:58:50 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "33905",
"subject": "GRB 230522A: GRBAlpha and VZLUSAT-2 joint detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz, M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Poon, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (U. Tokyo), K. Torigoe, Y. Uchida (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), T. Bozoki, G. Dalya, G. Friss, K. Kapas, J. Takatsy (Eotvos U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha and VZLUSAT-2/GRB payload collaborations\n\nWe report a joint detection of a likely long-duration GRB 230522A by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048) and the GRB detectors on board of VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/) The event was triggered by Konus/Wind at 2023-05-22 03:34:41.414 UT and also observed by INTEGRAL/SPI-ACS at 2023-05-22 03:34:45 UT. The Sun was occulted by the Earth for both CubeSats, therefore, it is unlikely to be a solar flare.\n\nThe GRBAlpha detection was confirmed at the peak time 2023-05-22 03:34:45 UTC. The T90 duration is 11 s and the significance during T90 reaches 47 sigma.\n\nThe light curve obtained by GRBAlpha is available here:\nhttps://grbalpha.konkoly.hu/static/share/GRB230522A_GCN.pdf\n\nThe VZLUSAT-2 detection was confirmed at the peak time 2023-05-22 03:34:43 UTC. The data acquisition was performed by the GRB detector units no. 0 and no. 1. The T90 duration is 10 s (12 s) and the significance during T90 reaches 30 sigma (9 sigma) for detector unit no. 0 (no. 1).\n\nThe light curves obtained by VZLUSAT-2 are available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230522A_GCN_VZLUSAT2.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n",
"published": "2023-06-02T16:59:01.805363Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-02T16:59:01.805437Z",
"modified": "2023-06-02T16:59:01.813635Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 94,
"topic": "gcn.circular",
"uuid": "4e39dbde-8af5-4761-9f38-5461bc594a9c",
"title": "Alert from the HAWC Burst Monitor HAWC-230527A",
"submitter": "Hop gcn.circular",
"authors": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"data": {
"date": "23/05/27 18:40:32 GMT",
"from": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"title": "GCN CIRCULAR",
"number": "33886",
"subject": "Alert from the HAWC Burst Monitor HAWC-230527A"
},
"message_text": "The HAWC Collaboration (http://www.hawc-observatory.org/collaboration/)\nreports:\n\nOn 05/27, 2023, at 11:19:48 UT, HAWC detected a burst signal\nfrom its Burst Monitoring named HAWC-230527A. This monitor system looks\nfor excesses above the expected background in time windows of 0.2, 1, 10\nand 100 seconds.\nThis event was found in the 100-second time window starting\nat the reported trigger time.\n\nThe position of the alert is\nRA (J200): 272.266 deg\nDec (J2000): 26.715 deg\nLocation uncertainty (68% containment): 0.4 deg (statistical only).\n\nThe monitor system found that this alert has a false alarm rate of 9.79\nalert(s) per year.\nWe encourage follow-up observations of the HAWC alert region. We however\nnote that it is\nconsistent with background expectation based on the observation time.\n\nThe initial automated alert is recorded in here:\nhttps://gcn.gsfc.nasa.gov/notices_amon_hawc/10011394_3758.amon\n\nHAWC is a very-high-energy gamma-ray observatory operating in Central\nMexico at latitude 19 deg. north. Operating day and night with over\n95% duty cycle, HAWC has an instantaneous field of view of 2 sr and\nsurveys 2/3 of the sky every day. It is sensitive to gamma rays\nfrom 300 GeV to 100 TeV.\n\n",
"published": "2023-05-27T18:40:42.025146Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-27T18:40:42.025179Z",
"modified": "2023-05-27T18:40:42.030548Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 133,
"topic": "gcn.circular",
"uuid": "a707a219-41df-4cf8-add3-573d3fc4612c",
"title": "GRB 230521A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/06/02 17:43:46 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "33906",
"subject": "GRB 230521A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/) detected a likely long-duration GRB 230521A. The event was triggered by Konus/Wind at 2023-05-21 18:52:04.019 UT and also observed by INTEGRAL/SPI-ACS at 2023-05-21 18:52:13 UT. The GOES-P X-ray flux does not show any increase at the time of this detection, therefore, it is unlikely to be a solar flare.\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-05-21 18:52:10 UTC. The T90 duration is 45 s (46 s) and the significance during T90 reaches 11 sigma (16 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB230521A_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n",
"published": "2023-06-02T17:43:54.083069Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-02T17:43:54.083089Z",
"modified": "2023-06-02T17:43:54.089953Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 102,
"topic": "gcn.circular",
"uuid": "1ba3e03e-6a1e-456b-87c7-e8b26bb094f3",
"title": "GRB 230529A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/05/29 08:05:21 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33887",
"subject": "GRB 230529A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 07:54:45 UT on 29 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230529A (trigger 707039690.316368 / 230529330).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 346.8, Dec = -50.0 (J2000 degrees, equivalent to J2000 23h 07m, -50d 00'), with a statistical uncertainty of 12.7 degrees.\n\nThe angle from the Fermi LAT boresight is 42.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230529330/quicklook/glg_skymap_all_bn230529330.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230529330/quicklook/glg_healpix_all_bn230529330.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230529330/quicklook/glg_lc_medres34_bn230529330.gif\n\n",
"published": "2023-05-29T08:05:33.336643Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-29T08:05:33.336674Z",
"modified": "2023-05-29T08:05:33.343668Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 106,
"topic": "gcn.circular",
"uuid": "e893f9d0-c3ba-4f97-bf8a-71a612da8c59",
"title": "LIGO/Virgo S230529p: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/29 13:58:39 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33888",
"subject": "LIGO/Virgo S230529p: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S230529p errorbox 531 sec after notice time and 11954 sec after trigger time at 2023-05-29 13:46:58 UT, with upper limit up to 17.0 mag. Observations started at twilight. The observations began at zenith distance = 67 deg. The sun altitude is -15.0 deg.\n\nThe galactic latitude b = -15 deg., longitude l = 256 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011906\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 12044 | 2023-05-29 13:46:58 | MASTER-Amur | (21h 15m 20.07s , +37d 24m 39.1s) | C | 180 | 17.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-29T13:58:47.447606Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-29T13:58:47.447627Z",
"modified": "2023-05-29T13:58:47.454588Z",
"nonlocalizedevents": [
{
"event_id": "S230529p"
}
],
"targets": []
},
{
"id": 111,
"topic": "gcn.circular",
"uuid": "e8a0a53d-f5f1-4f2c-9d28-a64d595a83ef",
"title": "LIGO/Virgo/KAGRA S230529ay: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"data": {
"date": "23/05/29 18:36:00 GMT",
"from": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"title": "GCN CIRCULAR",
"number": "33889",
"subject": "LIGO/Virgo/KAGRA S230529ay: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230529ay during\nreal-time processing of data from LIGO Livingston Observatory (L1) at\n2023-05-29 18:15:00.746 UTC (GPS time: 1369419318.746). The candidate\nwas found by the GstLAL [1] and PyCBC Live [2] analysis pipelines.\n\nS230529ay is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230529ay\n\nThe classification of the GW signal, in order of descending\nprobability is NSBH (62%), BNS (31%), Terrestrial (7%), or BBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is >99%. [3] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is 12%. [3] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat any one of the binary components lie between 3 to 5 solar mass\n(HasMassgap) is 98%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [4], distributed via GCN notice about 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [4], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\nwell fit by an ellipse with an area of 31171 deg2 described by the\nfollowing DS9 region (right ascension, declination, semi-major axis,\nsemi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(00h00m, +00d00m, 163.70d, 97.20d, 147.56d)\nMarginalized over the whole sky, the a posteriori luminosity distance\nestimate is 217 +/- 71 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\n<https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Dal Canton et al. ApJ 923, 254 (2021)\n [3] Chatterjee et al. The Astrophysical Journal 896, 1 (2020)\n [4] Singer & Price PRD 93, 024013 (2016)\n\n",
"published": "2023-05-29T18:36:12.673072Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-29T18:36:12.673093Z",
"modified": "2023-05-29T18:36:12.678159Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 112,
"topic": "gcn.circular",
"uuid": "37d855f1-b009-479d-bd98-2a6f6aae55b4",
"title": "LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation",
"submitter": "Hop gcn.circular",
"authors": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"data": {
"date": "23/05/29 19:14:52 GMT",
"from": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"title": "GCN CIRCULAR",
"number": "33890",
"subject": "LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation"
},
"message_text": "V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland)\nJ. Rodi (IAPS-Roma, Italy)\nA. Coleiro (APC, France)\nS. Mereghetti (INAF IASF-Milano, Italy)\n\non behalf of the INTEGRAL multi-messenger collaboration:\nhttps://www.astro.unige.ch/cdci/integral-multimessenger-collaboration\n\nUsing INTEGRAL/SPI-ACS realtime data (following [1]) we have performed\na search for a prompt gamma-ray counterpart of S230529ay (GCN 33889).\n\nAt the time of the event (2023-05-29 18:15:00 UTC, hereafter T0),\nINTEGRAL was operating in nominal mode. The peak of the event\nlocalization probability was at an angle of 122 deg with respect to\nthe spacecraft pointing axis. This orientation implies strongly\nsuppressed (2.8% of optimal) response of ISGRI, somewhat suppressed\n(57% of optimal) response of IBIS/Veto, and somewhat suppressed (47%\nof optimal) response of SPI-ACS.\n\nThe background within +/-300 seconds around the event was somewhat\nunstable (excess variance 1.8).\nIn addition, we note that excess noise at near Hz frequency has been noted\nin SPI-ACS data in recent days, related to satellite environment conditions.\n\nWe have performed a search for any impulsive events in INTEGRAL SPI-\nACS (as described in [2]) data.\n\nWe do not detect any significant counterparts and estimate a 3-sigma\nupper limit on the 75-2000 keV fluence of 3.4e-07 erg/cm^2 (within the\n50% probability containment region of the source localization) for a\nburst lasting less than 1 s with a characteristic short GRB spectrum\n(an exponentially cut off power law with alpha=-0.5 and Ep`0 keV)\noccurring at any time in the interval within 300 s around T0. For a\ntypical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and\nEp00 keV), the derived peak flux upper limit is ~3.2e-07 (8e-08)\nerg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range.\n\nFor the mean reported distance 217.0 Mpc this corresponds to the limit\non the total isotropic equivalent energy in 1 s of 1.9e+48 erg for\nthe short GRB spectrum and for a long GRB spectrum isotropic\nequivalent luminosity in 1 s (8 s) of 9.4e+47 erg/s (4.5e+47 erg/s)\n\nWe report for completeness and in order of FAP, all excesses\nidentified in the search region. We find: 4 likely background\nexcesses:\n\nT-T0 | scale | S/N | luminosity ( x 1e+48 erg/s) | FAP\n262 | 1.7 | 4.7 | 33.8 +/- 8.3 +/- 30.4 | 0.276\n-12.1 | 0.45 | 3.1 | 3.87 +/- 1.62 +/- 3.48 | 0.498\n-6.59 | 0.1 | 3.3 | 8.42 +/- 3.46 +/- 7.58 | 0.728\n-91.3 | 0.95 | 3.5 | 3.07 +/- 1.11 +/- 2.76 | 0.756\n\nNote that FAP estimates (especially at timescales above 2s) may be\npossibly further affected by enhanced non-stationary local background\nnoise. This list excludes any excesses for which FAP is close to\nunity.\n\n\n\nAll results quoted are preliminary.\n\nThis circular is an official product of the INTEGRAL Multi-Messenger\nteam.\n\nNote that we send GCNs Circulars only when one of the following\nconditions is met: merger contains at least one neutron star, a\nsignificant counterpart is reported.\n\n[1] Savchenko et al. 2017, A&A 603, A46\n[2] Savchenko et al. 2012, A&A 541A, 122S\n\n",
"published": "2023-05-29T19:15:02.123294Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-29T19:15:02.123364Z",
"modified": "2023-05-29T19:15:02.130829Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 113,
"topic": "gcn.circular",
"uuid": "8893843b-07a2-44ae-a5b5-4df25a2a917b",
"title": "LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"data": {
"date": "23/05/29 20:03:57 GMT",
"from": "J. L. Wright at Australian National University <jennifer.wright@anu.edu.au>",
"title": "GCN CIRCULAR",
"number": "33891",
"subject": "LIGO/Virgo/KAGRA S230529ay: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Livingston Observatory\n(L1) data around the time of the compact binary merger (CBC) candidate\nS230529ay (GCN Circular 33889).\nParameter estimation has been performed using Bilby [1] and a new sky\nmap, Bilby.multiorder.fits,0, distributed via GCN Notice, is available\nfor retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230529ay\n\nBased on posterior support from parameter estimation [1], under the\nassumption that the candidate S230529ay is astrophysical in origin,the\nprobability that the lighter compact object is consistent with a\nneutron star mass (HasNS) is 98%. [2] Using the masses and spins\ninferred from the signal, the probability of matter outside the final\ncompact object (HasRemnant) is 1%. [2] Both HasNS and HasRemnant\nconsider the support of several neutron star equations of state. The\nprobability that any one of the binary components lie between 3 to 5\nsolar mass (HasMassgap) is 69%.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is\n25623 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 201 +/- 63 Mpc (a posteriori mean +/-\nstandard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\n<https://emfollow.docs.ligo.org/userguide/>.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. The Astrophysical Journal 896, 1 (2020)\n\n",
"published": "2023-05-29T20:04:05.856187Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-29T20:04:05.856223Z",
"modified": "2023-05-29T20:04:05.863455Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 114,
"topic": "gcn.circular",
"uuid": "f2a50fca-3cac-4c54-8471-cec7cd4a4e1c",
"title": "LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"data": {
"date": "23/05/30 01:55:30 GMT",
"from": "Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>",
"title": "GCN CIRCULAR",
"number": "33892",
"subject": "LIGO/Virgo/KAGRA S230529ay: Upper limits from Fermi-GBM Observations"
},
"message_text": "S. Lesage (UAH) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo/KAGRA group\n\nFor S230529ay (GCN 33889 and GCN 33891) and using the Bilby skymap, Fermi-GBM was observing 60.7% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S230529ay. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA1.5, Dec#.9 with a radius of 67.6 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 1.2 1.9 3.5\n1.024 s: 0.5 0.7 1.2\n8.192 s: 0.2 0.2 0.4\n\nAssuming the median luminosity distance of 200.6 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.009 0.013 0.039\n1.024s: 0.003 0.005 0.013\n8.192s: 0.001 0.002 0.005\n\n",
"published": "2023-05-30T01:55:39.553047Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T01:55:39.553068Z",
"modified": "2023-05-30T01:55:39.559630Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 154,
"topic": "gcn.circular",
"uuid": "473bf297-2887-48bc-834e-20c7530293a3",
"title": "LIGO/Virgo/KAGRA S230605o: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "lucia.papalini@phd.unipi.it",
"data": {
"date": "23/06/05 07:20:47 GMT",
"from": "lucia.papalini@phd.unipi.it",
"title": "GCN CIRCULAR",
"number": "33914",
"subject": "LIGO/Virgo/KAGRA S230605o: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230605o during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-05 06:53:43.494 UTC (GPS\ntime: 1369983241.494). The candidate was found by the MBTA [1], GstLAL\n[2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS230605o is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.5e-09 Hz, or about one in 7\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230605o\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (99%), Terrestrial (1%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [5] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat any one of the binary components lie between 3 to 5 solar mass\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 22 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 4 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n1370 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1096 +/- 333 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\n<https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Aubin et al. CQG 38, 095004 (2021)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n",
"published": "2023-06-05T07:20:56.776652Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T07:20:56.776681Z",
"modified": "2023-06-05T07:20:56.782181Z",
"nonlocalizedevents": [
{
"event_id": "S230605o"
}
],
"targets": []
},
{
"id": 2875,
"topic": "gcn.circular",
"uuid": "4d8c0e60-46a1-46f4-9a24-2fc95e350a12",
"title": "Fermi trigger No 716145795: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/09/11 19:30:44 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34663",
"subject": "Fermi trigger No 716145795: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB230911.72 (trigger No 716145795,13h 20m 04.08s , +22d 45m 00.0s, R\".5) errorbox 3923 sec after notice time and 3931 sec after trigger time at 2023-09-11 18:28:41 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 76 deg. The sun altitude is -30.4 deg.\n\nThe galactic latitude b = 82 deg., longitude l = 1 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"69059\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 3961 | 2023-09-11 18:28:41 | MASTER-Kislovodsk | (13h 19m 18.50s , +39d 25m 08.4s) | C | 60 | 17.7 |\n 4041 | 2023-09-11 18:30:02 | MASTER-Kislovodsk | (12h 59m 41.52s , +39d 25m 54.4s) | C | 60 | 16.1 |\n 4288 | 2023-09-11 18:34:08 | MASTER-Kislovodsk | (13h 25m 13.11s , +43d 14m 08.8s) | C | 60 | 17.6 |\n 4368 | 2023-09-11 18:35:28 | MASTER-Kislovodsk | (13h 08m 27.03s , +45d 08m 27.7s) | C | 60 | 17.5 |\n 4448 | 2023-09-11 18:36:48 | MASTER-Kislovodsk | (13h 30m 00.25s , +45d 08m 12.0s) | C | 60 | 17.3 |\n 4608 | 2023-09-11 18:39:28 | MASTER-Kislovodsk | (13h 51m 25.36s , +45d 08m 03.0s) | C | 60 | 17.9 |\n 4689 | 2023-09-11 18:40:49 | MASTER-Kislovodsk | (13h 46m 02.67s , +43d 15m 33.9s) | C | 60 | 17.8 |\n 4769 | 2023-09-11 18:42:09 | MASTER-Kislovodsk | (13h 35m 50.37s , +47d 01m 21.6s) | C | 60 | 17.8 |\n 5121 | 2023-09-11 18:48:01 | MASTER-Kislovodsk | (13h 29m 54.06s , +45d 08m 47.8s) | C | 60 | 17.3 |\n 5282 | 2023-09-11 18:50:42 | MASTER-Kislovodsk | (13h 56m 41.44s , +44d 46m 59.4s) | C | 60 | 14.6 |\n 5282 | 2023-09-11 18:50:42 | MASTER-Kislovodsk | (13h 51m 20.77s , +45d 07m 29.8s) | C | 60 | 17.5 |\n 5362 | 2023-09-11 18:52:02 | MASTER-Kislovodsk | (13h 46m 07.06s , +43d 13m 41.8s) | C | 60 | 17.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjk0NDYwNjQ5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.5KRy0BTvLtVNOePIPetAsb6iurBfbP2mu2FR_Ia8d-s\n\n",
"published": "2023-09-11T19:31:01.198061Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-11T19:31:01.198081Z",
"modified": "2023-09-11T19:31:01.205325Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 115,
"topic": "gcn.circular",
"uuid": "95424ed6-aa85-4adf-9a25-1a1bca7167fe",
"title": "LIGO/Virgo/KAGRA S230529ay: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/05/30 05:13:28 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33893",
"subject": "LIGO/Virgo/KAGRA S230529ay: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "S. Sugita, M. Serino (AGU),\nH. Negoro (Nihon U.),\nN. Kawai (RIKEN),\nM. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN),\nT. Sakamoto, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.),\nM. Shidatsu (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.),\nY. Kawakubo (LSU),\nM. Sugizaki (NAOC),\nW. Iwakiri (Chiba U.)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter the compact binary merger candidate S230529ay at 2023-05-29 18:15:00.746 UTC (GCN 33889).\n\nAt the trigger time of S230529ay, the high-voltage of MAXI/GSC was off\nThe first one-orbit (92 min) scan observation with GSC after the event covered 91%\nof the 90% credible region of the Bilby skymap (GCN 33891) from 18:31:41 to 19:40:39 UTC (T0+1001 to T0+5139 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n\n",
"published": "2023-05-30T05:13:36.251141Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T05:13:36.251162Z",
"modified": "2023-05-30T05:13:36.257395Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 116,
"topic": "gcn.circular",
"uuid": "917e2495-3ecd-4bef-8c4f-346bcad37d5e",
"title": "LIGO/Virgo/KAGRA S230529ay: upper limits from AGILE/MCAL",
"submitter": "Hop gcn.circular",
"authors": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"data": {
"date": "23/05/30 08:00:31 GMT",
"from": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"title": "GCN CIRCULAR",
"number": "33894",
"subject": "LIGO/Virgo/KAGRA S230529ay: upper limits from AGILE/MCAL"
},
"message_text": "F. Longo (Univ. Trieste, and INFN Trieste), M. Tavani (INAF/IAPS,\nand Univ. Roma Tor Vergata), F. Verrecchia, C. Pittori (SSDC, and\nINAF/OAR), M. Cardillo, C. Casentini, L. Foffano, G. Piano (INAF/IAPS),\nA. Ursi (ASI and INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR),\nL. Baroncelli, A. Bulgarelli, A. Ciabattoni, A. Di Piano, V.\nFioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), M.\nPilia (INAF/OA-Cagliari), report on behalf of the AGILE Team:\n\nIn response to the LIGO/Virgo/KAGRA GW event S230529y at\nT0 = 2023-05-29 18:15:00.89 (UT), a preliminary analysis of the\nAGILE minicalorimeter (MCAL) triggered data found no event candidates\nwithin a time interval covering -/+ 15 sec from the LIGO/Virgo/KAGRA T0.\n\nAt the T0, about 60% of the S230529y 90% c.l. localization region\nwas accessible to the AGILE/MCAL.\n\nThree-sigma upper limits (ULs) are obtained for a 1 s integration\ntime at different celestial positions within the accessible S230529y\nlocalization region in the energy range 0.4-1 MeV, from a minimum\nof 1.5E-06 erg cm^-2 to a maximum of 3.1E-06 erg cm^-2 (assuming as\nspectral model a single power-law with photon index 1.5).\n\nAn independent procedure based on photon counting statistics provides\nUL fluences in the same band, from a minimum of 1.1E-08 erg cm^-2\nto a maximum of 2.1E-08 erg cm^-2.\n\nThe AGILE/MCAL detector is a CsI detector with a 4 pi FoV, sensitive\nin the energy range 0.4-100 MeV. Additional analysis of AGILE data\nis in progress.\n\n",
"published": "2023-05-30T08:00:40.745660Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T08:00:40.745681Z",
"modified": "2023-05-30T08:00:40.752036Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 117,
"topic": "gcn.circular",
"uuid": "6f458032-3e36-4fd8-8c82-87ff2c8f1bb5",
"title": "LIGO/Virgo S230529ay: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/05/30 08:50:55 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33895",
"subject": "LIGO/Virgo S230529ay: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230529ay errorbox 35464 sec after notice time and 35512 sec after trigger time at 2023-05-30 04:06:52 UT, with upper limit up to 20.0 mag. The observations began at zenith distance = 44 deg. The sun altitude is -79.1 deg.\n\nThe galactic latitude b = 10 deg., longitude l = 351 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011912\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 35602 | 2023-05-30 04:06:52 | MASTER-OAFA | (19h 30m 28.49s , -54d 33m 15.6s) | C | 180 | 17.5 |\n 35782 | 2023-05-30 04:06:52 | MASTER-OAFA | (19h 30m 28.48s , -54d 33m 15.6s) | C | 540 | 17.7 | Coadd\n 35802 | 2023-05-30 04:10:11 | MASTER-OAFA | (19h 44m 00.85s , -54d 34m 42.6s) | C | 180 | 17.3 |\n 35982 | 2023-05-30 04:10:11 | MASTER-OAFA | (19h 44m 00.85s , -54d 34m 42.7s) | C | 540 | 17.1 | Coadd\n 36001 | 2023-05-30 04:13:31 | MASTER-OAFA | (19h 01m 09.49s , -56d 46m 37.5s) | C | 180 | 16.5 |\n 36201 | 2023-05-30 04:16:50 | MASTER-OAFA | (19h 15m 33.95s , -56d 48m 33.1s) | C | 180 | 16.7 |\n 36400 | 2023-05-30 04:20:10 | MASTER-OAFA | (19h 30m 28.92s , -54d 32m 13.8s) | C | 180 | 17.1 |\n 36605 | 2023-05-30 04:23:34 | MASTER-OAFA | (19h 44m 00.34s , -54d 33m 38.6s) | C | 180 | 16.1 |\n 36804 | 2023-05-30 04:26:54 | MASTER-OAFA | (19h 01m 08.06s , -56d 46m 09.6s) | C | 180 | 16.1 |\n 37004 | 2023-05-30 04:30:13 | MASTER-OAFA | (19h 15m 38.21s , -56d 47m 39.9s) | C | 180 | 15.3 |\n 37203 | 2023-05-30 04:33:33 | MASTER-OAFA | (19h 30m 23.62s , -54d 34m 09.8s) | C | 180 | 16.6 |\n 37404 | 2023-05-30 04:36:54 | MASTER-OAFA | (19h 44m 06.81s , -54d 34m 15.8s) | C | 180 | 14.3 |\n 38403 | 2023-05-30 04:53:33 | MASTER-OAFA | (19h 01m 07.43s , -56d 48m 08.9s) | C | 180 | 12.2 |\n 38583 | 2023-05-30 04:53:33 | MASTER-OAFA | (19h 01m 07.47s , -56d 48m 09.0s) | C | 540 | 17.0 | Coadd\n 38603 | 2023-05-30 04:56:52 | MASTER-OAFA | (19h 15m 38.31s , -56d 48m 36.1s) | C | 180 | 13.6 |\n 38802 | 2023-05-30 05:00:12 | MASTER-OAFA | (19h 30m 28.11s , -54d 32m 28.0s) | C | 180 | 15.6 |\n 38982 | 2023-05-30 05:00:12 | MASTER-OAFA | (19h 30m 28.13s , -54d 32m 28.0s) | C | 540 | 17.4 | Coadd\n 39002 | 2023-05-30 05:03:31 | MASTER-OAFA | (19h 44m 05.53s , -54d 34m 27.1s) | C | 180 | 16.8 |\n 39201 | 2023-05-30 05:06:51 | MASTER-OAFA | (19h 01m 14.67s , -56d 46m 26.1s) | C | 180 | 16.9 |\n 39600 | 2023-05-30 05:13:30 | MASTER-OAFA | (19h 30m 26.22s , -54d 32m 07.7s) | C | 180 | 17.4 |\n 39800 | 2023-05-30 05:16:49 | MASTER-OAFA | (19h 44m 09.80s , -54d 33m 33.8s) | C | 180 | 18.4 |\n 40000 | 2023-05-30 05:20:09 | MASTER-OAFA | (19h 01m 09.23s , -56d 48m 12.2s) | C | 180 | 17.0 |\n 40199 | 2023-05-30 05:23:28 | MASTER-OAFA | (19h 15m 39.38s , -56d 48m 21.4s) | C | 180 | 17.5 |\n 40379 | 2023-05-30 05:23:28 | MASTER-OAFA | (19h 15m 39.38s , -56d 48m 21.3s) | C | 540 | 18.0 | Coadd\n 40439 | 2023-05-30 05:27:29 | MASTER-OAFA | (19h 30m 29.31s , -54d 34m 02.2s) | C | 180 | 17.3 |\n 40459 | 2023-05-30 05:27:48 | MASTER-OAFA | (19h 01m 10.37s , -56d 46m 13.3s) | C | 180 | 17.9 |\n 40658 | 2023-05-30 05:31:08 | MASTER-OAFA | (19h 15m 40.91s , -56d 47m 41.2s) | C | 180 | 18.0 |\n 40858 | 2023-05-30 05:34:27 | MASTER-OAFA | (18h 44m 35.92s , -54d 32m 44.0s) | C | 180 | 18.4 |\n 41107 | 2023-05-30 05:38:37 | MASTER-OAFA | (18h 58m 10.02s , -54d 31m 38.1s) | C | 180 | 17.6 |\n 41127 | 2023-05-30 05:38:56 | MASTER-OAFA | (19h 44m 10.12s , -54d 32m 51.9s) | C | 180 | 17.1 |\n 41347 | 2023-05-30 05:42:36 | MASTER-OAFA | (19h 01m 10.04s , -56d 47m 16.0s) | C | 180 | 17.4 |\n 41566 | 2023-05-30 05:46:16 | MASTER-OAFA | (19h 15m 36.26s , -56d 46m 41.8s) | C | 180 | 15.8 |\n 41869 | 2023-05-30 05:51:19 | MASTER-OAFA | (18h 44m 30.25s , -54d 30m 46.4s) | C | 180 | 16.1 |\n 42049 | 2023-05-30 05:51:19 | MASTER-OAFA | (18h 44m 30.24s , -54d 30m 46.4s) | C | 540 | 18.3 | Coadd\n 42124 | 2023-05-30 05:55:34 | MASTER-OAFA | (18h 58m 06.98s , -54d 31m 10.7s) | C | 180 | 17.7 |\n 42304 | 2023-05-30 05:55:34 | MASTER-OAFA | (18h 58m 06.96s , -54d 31m 10.7s) | C | 540 | 19.0 | Coadd\n 42344 | 2023-05-30 05:59:13 | MASTER-OAFA | (19h 30m 33.38s , -54d 33m 08.8s) | C | 180 | 16.5 |\n 42564 | 2023-05-30 06:02:54 | MASTER-OAFA | (19h 44m 05.20s , -54d 34m 32.2s) | C | 180 | 17.8 |\n 42955 | 2023-05-30 06:09:24 | MASTER-OAFA | (19h 01m 18.55s , -56d 48m 07.4s) | C | 180 | 16.9 |\n 43020 | 2023-05-30 06:10:30 | MASTER-OAFA | (18h 44m 35.08s , -54d 32m 23.2s) | C | 180 | 17.5 |\n 43239 | 2023-05-30 06:14:09 | MASTER-OAFA | (18h 58m 14.61s , -54d 31m 13.0s) | C | 180 | 18.6 |\n 43459 | 2023-05-30 06:17:48 | MASTER-OAFA | (18h 44m 33.23s , -54d 30m 50.7s) | C | 180 | 18.6 |\n 43678 | 2023-05-30 06:21:28 | MASTER-OAFA | (18h 58m 15.00s , -54d 32m 15.5s) | C | 180 | 18.7 |\n 43944 | 2023-05-30 06:25:54 | MASTER-OAFA | (18h 44m 39.81s , -54d 31m 52.1s) | C | 180 | 18.7 |\n 44124 | 2023-05-30 06:25:54 | MASTER-OAFA | (18h 44m 39.81s , -54d 31m 52.1s) | C | 540 | 19.3 | Coadd\n 44164 | 2023-05-30 06:29:33 | MASTER-OAFA | (18h 58m 10.72s , -54d 33m 09.7s) | C | 180 | 18.7 |\n 44344 | 2023-05-30 06:29:33 | MASTER-OAFA | (18h 58m 10.72s , -54d 33m 09.7s) | C | 540 | 19.4 | Coadd\n 44383 | 2023-05-30 06:33:13 | MASTER-OAFA | (18h 44m 39.91s , -54d 32m 09.9s) | C | 180 | 18.8 |\n 44603 | 2023-05-30 06:36:52 | MASTER-OAFA | (18h 58m 14.62s , -54d 31m 16.5s) | C | 180 | 18.8 |\n 44822 | 2023-05-30 06:40:31 | MASTER-OAFA | (18h 44m 38.06s , -54d 32m 26.4s) | C | 180 | 18.8 |\n 45087 | 2023-05-30 06:44:56 | MASTER-OAFA | (18h 58m 11.48s , -54d 30m 50.1s) | C | 180 | 18.8 |\n 45306 | 2023-05-30 06:48:36 | MASTER-OAFA | (18h 44m 41.94s , -54d 31m 29.9s) | C | 180 | 18.9 |\n 45526 | 2023-05-30 06:52:15 | MASTER-OAFA | (18h 58m 12.89s , -54d 32m 53.1s) | C | 180 | 18.9 |\n 45745 | 2023-05-30 06:55:55 | MASTER-OAFA | (18h 44m 43.01s , -54d 32m 04.3s) | C | 180 | 18.9 |\n 45965 | 2023-05-30 06:59:35 | MASTER-OAFA | (18h 58m 16.26s , -54d 31m 06.3s) | C | 180 | 18.9 |\n 46185 | 2023-05-30 07:03:14 | MASTER-OAFA | (21h 07m 49.25s , -43d 19m 29.1s) | C | 180 | 19.0 |\n 46365 | 2023-05-30 07:03:14 | MASTER-OAFA | (21h 07m 49.24s , -43d 19m 29.1s) | C | 540 | 19.7 | Coadd\n 46412 | 2023-05-30 07:07:01 | MASTER-OAFA | (21h 18m 37.52s , -43d 20m 22.6s) | C | 180 | 19.1 |\n 46592 | 2023-05-30 07:07:01 | MASTER-OAFA | (21h 18m 37.52s , -43d 20m 22.6s) | C | 540 | 19.8 | Coadd\n 46632 | 2023-05-30 07:10:41 | MASTER-OAFA | (21h 05m 33.17s , -47d 50m 06.3s) | C | 180 | 19.2 |\n 46812 | 2023-05-30 07:10:41 | MASTER-OAFA | (21h 05m 33.17s , -47d 50m 06.3s) | C | 540 | 19.9 | Coadd\n 46851 | 2023-05-30 07:14:21 | MASTER-OAFA | (21h 17m 14.87s , -47d 51m 22.5s) | C | 180 | 19.1 |\n 47031 | 2023-05-30 07:14:21 | MASTER-OAFA | (21h 17m 14.88s , -47d 51m 22.5s) | C | 540 | 19.9 | Coadd\n 47071 | 2023-05-30 07:18:01 | MASTER-OAFA | (21h 07m 49.44s , -43d 20m 57.2s) | C | 180 | 19.2 |\n 47291 | 2023-05-30 07:21:40 | MASTER-OAFA | (21h 18m 41.65s , -43d 19m 49.5s) | C | 180 | 19.1 |\n 47510 | 2023-05-30 07:25:20 | MASTER-OAFA | (21h 05m 30.21s , -47d 50m 58.9s) | C | 180 | 19.2 |\n 47730 | 2023-05-30 07:29:00 | MASTER-OAFA | (21h 17m 21.25s , -47d 49m 32.0s) | C | 180 | 19.1 |\n 47955 | 2023-05-30 07:32:44 | MASTER-OAFA | (21h 07m 44.55s , -43d 20m 09.8s) | C | 180 | 19.3 |\n 48178 | 2023-05-30 07:36:28 | MASTER-OAFA | (21h 18m 38.89s , -43d 19m 23.4s) | C | 180 | 19.1 |\n 48382 | 2023-05-30 07:39:51 | MASTER-OAFA | (21h 05m 34.34s , -47d 50m 09.6s) | C | 180 | 19.2 |\n 48581 | 2023-05-30 07:43:11 | MASTER-OAFA | (21h 17m 15.72s , -47d 51m 25.2s) | C | 180 | 19.2 |\n 48810 | 2023-05-30 07:47:00 | MASTER-OAFA | (21h 07m 47.95s , -43d 19m 33.3s) | C | 180 | 19.3 |\n 48990 | 2023-05-30 07:47:00 | MASTER-OAFA | (21h 07m 47.95s , -43d 19m 33.3s) | C | 540 | 20.0 | Coadd\n 49030 | 2023-05-30 07:50:39 | MASTER-OAFA | (21h 18m 42.68s , -43d 21m 22.8s) | C | 180 | 19.2 |\n 49210 | 2023-05-30 07:50:39 | MASTER-OAFA | (21h 18m 42.68s , -43d 21m 22.9s) | C | 540 | 19.9 | Coadd\n 49249 | 2023-05-30 07:54:19 | MASTER-OAFA | (21h 05m 27.48s , -47d 50m 12.3s) | C | 180 | 19.2 |\n 49456 | 2023-05-30 07:57:45 | MASTER-OAFA | (21h 17m 16.41s , -47d 49m 26.9s) | C | 180 | 19.3 |\n 49655 | 2023-05-30 08:01:05 | MASTER-OAFA | (21h 07m 51.38s , -43d 20m 14.2s) | C | 180 | 19.3 |\n 49855 | 2023-05-30 08:04:24 | MASTER-OAFA | (21h 18m 40.24s , -43d 21m 27.2s) | C | 180 | 19.2 |\n 50054 | 2023-05-30 08:07:44 | MASTER-OAFA | (21h 05m 34.85s , -47d 51m 06.0s) | C | 180 | 19.1 |\n 50254 | 2023-05-30 08:11:03 | MASTER-OAFA | (21h 17m 20.16s , -47d 49m 32.0s) | C | 180 | 18.3 |\n 50473 | 2023-05-30 08:14:43 | MASTER-OAFA | (21h 07m 48.91s , -43d 21m 05.2s) | C | 180 | 19.2 |\n 50693 | 2023-05-30 08:18:22 | MASTER-OAFA | (21h 18m 46.84s , -43d 19m 37.9s) | C | 180 | 19.1 |\n 50919 | 2023-05-30 08:22:09 | MASTER-OAFA | (17h 58m 36.70s , -30d 31m 04.3s) | C | 180 | 16.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-30T08:51:03.888378Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T08:51:03.888401Z",
"modified": "2023-05-30T08:51:03.895512Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 118,
"topic": "gcn.circular",
"uuid": "1b098a19-40bf-4e30-8308-7cbbdd098743",
"title": "LIGO/Virgo/KAGRA S230529ay: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/05/30 11:47:31 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33896",
"subject": "LIGO/Virgo/KAGRA S230529ay: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried out a search for X-ray candidates in AstroSat CZTI data in a 100-sec window around the trigger time of the event S230529ay (UTC 2023-05-29 18:15:00, GraceDB event). We use the Bilby.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230529ay/files/Bilby.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a considerable effective area for about 29% of the entire sky but is also sensitive to brighter transients from the entire sky. At the time of the merger, AstroSat's nominal pointing is RA, DEC = 12:26:03.3, 33:32:18.1 (186.5138,33.5384), which is ~103 deg away from the maximum probability location, which severely reduces the effective area of CZTI. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~81 deg and hence is not occulted by Earth in the satellite's frame. In a time interval of 100 sec around the event, the region of the localization map which Earth does not occult in the satellite's frame has a total probability of 0.76 (76%).\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical background count rate fluctuations were estimated using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100-sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modeled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability-weighted mean over the visible sky:\n\n0.1 s: flux limit= 1.31e-05 ergs/cm^2/s; fluence limit = 1.31e-06 ergs/cm^2\n1.0 s: flux limit= 2.42e-06 ergs/cm^2/s; fluence limit = 2.42e-06 ergs/cm^2\n10.0 s: flux limit= 3.22e-07 ergs/cm^2/s; fluence limit = 3.22e-06 ergs/cm^2\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI EMGW detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n",
"published": "2023-05-30T11:47:41.286272Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T11:47:41.286306Z",
"modified": "2023-05-30T11:47:41.293440Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 119,
"topic": "gcn.circular",
"uuid": "249ff524-6cba-435a-b5b8-7c22ba74919e",
"title": "LIGO/Virgo/KAGRA S230529ay: Upper limits from CALET observations.",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/05/30 19:42:13 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "33897",
"subject": "LIGO/Virgo/KAGRA S230529ay: Upper limits from CALET observations."
},
"message_text": "S. Sugita, A. Yoshida, T. Sakamoto (AGU), Y. Kawakubo (LSU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR),\nS. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu,\nT. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nAt the trigger time of the compact binary merger candidate\nS230529ay T0 = 2023-05-29 18:15:00 UT (The LIGO Scientific\nCollaboration, the Virgo Collaboration, the KAGRA Collaboration,\nGCN Circ. 33889, 33891) the CALET Gamma-ray Burst Monitor\n(CGBM) high voltages were off (from T0-2 min to T0+3 min).\n\nThe CALET Calorimeter (CAL) was operating in the high energy trigger\nmode at the trigger time of S230529ay. Using the CAL data, we searched\nfor gamma-ray events in the 10-100 GeV band from -60 sec to +60 sec from\nthe GW trigger time and found no candidates in the overwrap region with the\nLVK high probability localization region. The 90% upper limit of CAL is\n1.2 x 10^-5 erg/cm^2/s (10-100 GeV) when the summed LVK probability reaches\n20%. The CAL FOV was centered at RA = 118 deg, DEC = +47 deg at T0.\n\nThe preliminary CGBM analysis for O4 events can be found here:\nhttp://cgbm.calet.jp/cgbm_trigger/O4\n\n",
"published": "2023-05-30T19:42:25.738690Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-30T19:42:25.738712Z",
"modified": "2023-05-30T19:42:25.746619Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 121,
"topic": "gcn.circular",
"uuid": "619765d3-4f94-4cf5-8e46-ec4a10a238de",
"title": "LIGO/Virgo/KAGRA S230527ch: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "23/05/31 03:32:27 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33898",
"subject": "LIGO/Virgo/KAGRA S230527ch: Zwicky Transient Facility observations"
},
"message_text": "Akash Anumarlapudi (UWM), Tomas Ahumada (CIT), Viraj Karambelkar (CIT),\nRobert Stein (CIT), Gaurav Waratkar (IITB), Anirudh Salgundi (IITB),\nVishwajeet Swain (IITB), Theophile du Laz (CIT), Igor Andreoni (UMD),\nMichael Coughlin (UMN), Mansi Kasliwal (CIT), Varun Bhalerao (IITB), Simeon\nReusch (DESY), Jannis Necker (DESY), Shreya Anand (CIT), Eric Bellm (UW),\nD. Perley (LJMU), D. Kaplan (UWM), S.B. Cenko (UMD) report on behalf of the\nZTF and GROWTH collaborations:\n\n\nWe observed the localization region of LVC trigger S230527ch as part of\nroutine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al.,\n2019) survey operations. We obtained images in the r, i, and g bands\nbeginning at ~9 hours after the burst trigger time and covering ~20% of the\nprobability enclosed in the localization region (18 % with galactic\nlatitude |b|>10, 2 % with |b|<10).\n\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through\nFritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep),\nAMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021).\nWe required at least 2 detections separated by at least 15 minutes to\nselect against moving objects. Furthermore, we cross-match our candidates\nwith the Minor Planet Center to flag known asteroids, reject stellar\nsources (Tachibana and Miller 2018), and apply machine learning algorithms\n(Mahabal et al. 2019). We require that no spatially coincident ZTF alerts\nwere issued before the detection time of the LVC trigger. We also run\nforced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry\net al. 2018, Smith et al. 2020) and require no detections before the LVC\ntrigger.\n\n\nTwo sources passed our criteria and are inside the 95% error region:\n\n|-----------------------------------------------------------------------------------------------------\n| id | alias | ra | dec | mjd\n | mag±err (ab) | filter | comments |\n|-----------------------------------------------------------------------------------------------------------------\n| ZTF23aamnsjs | AT2023jtu | 280.2040 | -20.6598 |\n60094.23830 | 19.20±0.14 | r |\n| ZTF23aamdode | AT2023jpc | 257.1902 | 8.9143 |\n60092.3303 | 17.83±0.01 | r | likely a CV based on spectrum |\n|----------------------------------------------------------------------------------------------------------------\n\nWe obtained a spectrum of AT2023jpc with the SEDM spectrograph on the\n60-inch telescope at Palomar Observatory (Blagorodnova et al. 2017). The\nspectrum shows a blue, featureless continuum indicating that this transient\nis a cataclysmic variable (CV).\n\nFurther follow-up of this localization region will continue as part of\nregular survey operations.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,\nUSA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,\nGermany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;\nIITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.\nZTF acknowledges the generous support of the NSF under AST MSIP Grant No\n1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant\nNo 1545949. Alert distribution service provided by DIRAC@UW (Patterson et\nal. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019)\nand Kowalski (Duev et al. 2019). GROWTH India telescope is located at the\nIndian Astronomical Observatory (Hanle), operated by the Indian Institute\nof Astrophysics (IIA). GROWTH-India project is supported by SERB and\nadministered by IUSSTF, under grant number IUSSTF/PIRE\nProgram/GROWTH/2015-16 and IUCAA.\n\n",
"published": "2023-05-31T03:32:35.998556Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-31T03:32:35.998577Z",
"modified": "2023-05-31T03:32:36.011606Z",
"nonlocalizedevents": [
{
"event_id": "S230527c"
}
],
"targets": []
},
{
"id": 122,
"topic": "gcn.circular",
"uuid": "910886c7-843a-4d49-9f86-d6e3dd04477f",
"title": "LIGO/Virgo/KAGRA S230528a: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "23/05/31 03:32:34 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33899",
"subject": "LIGO/Virgo/KAGRA S230528a: Zwicky Transient Facility observations"
},
"message_text": "Tomas Ahumada (CIT), Akash Anumarlapudi(UWM), Viraj Karambelkar (CIT),\nRobert Stein (CIT), Gaurav Waratkar (IITB), Anirudh Salgundi (IITB),\nVishwajeet Swain (IITB), Theophile du Laz (CIT), Igor Andreoni (UMD),\nMichael Coughlin (UMN), Mansi Kasliwal (CIT), Varun Bhalerao (IITB), Simeon\nReusch (DESY), Jannis Necker (DESY), Shreya Anand (CIT), Eric Bellm (UW),\nS.B. Cenko (UMD), D. Perley (LJMU), D. Kaplan (UWM) report on behalf of the\nZTF and GROWTH collaborations:\n\n\nWe observed the localization region of LVC trigger S230528a as part of\nroutine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al.,\n2019) survey operations. We obtained images in the r, i, and g bands\nbeginning at 2023-05-28T05:38:40.001 (3 hours after the burst trigger\ntime). The observations covered ~5% of the probability enclosed in the\nlocalization region.\n\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through\nFritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep),\nAMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021).\nWe required at least 2 detections separated by at least 15 minutes to\nselect against moving objects. Furthermore, we cross-match our candidates\nwith the Minor Planet Center to flag known asteroids, reject stellar\nsources (Tachibana and Miller 2018), and apply machine learning algorithms\n(Mahabal et al. 2019). We require that no spatially coincident ZTF alerts\nwere issued before the detection time of the LVC trigger. We also run\nforced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry\net al. 2018, Smith et al. 2020) and require no detections before the LVC\ntrigger.\n\nWe do not identify any sources that pass our selection criteria.\n\n\nFurther follow-up of this localization region will continue as part of\nregular survey operations.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,\nUSA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,\nGermany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;\nIITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.\nZTF acknowledges the generous support of the NSF under AST MSIP Grant No\n1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant\nNo 1545949. Alert distribution service provided by DIRAC@UW (Patterson et\nal. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019)\nand Kowalski (Duev et al. 2019). GROWTH India telescope is located at the\nIndian Astronomical Observatory (Hanle), operated by the Indian Institute\nof Astrophysics (IIA). GROWTH-India project is supported by SERB and\nadministered by IUSSTF, under grant number IUSSTF/PIRE\nProgram/GROWTH/2015-16 and IUCAA.\n\n",
"published": "2023-05-31T03:32:39.045941Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-31T03:32:39.045962Z",
"modified": "2023-05-31T03:32:39.050554Z",
"nonlocalizedevents": [
{
"event_id": "S230528a"
}
],
"targets": []
},
{
"id": 123,
"topic": "gcn.circular",
"uuid": "469a0d3c-a51a-45ac-b615-af468d03d413",
"title": "LIGO/Virgo/KAGRA S230529ay: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "23/05/31 03:32:40 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"title": "GCN CIRCULAR",
"number": "33900",
"subject": "LIGO/Virgo/KAGRA S230529ay: Zwicky Transient Facility observations"
},
"message_text": "Viraj Karambelkar (CIT), Tomas Ahumada (CIT), Robert Stein (CIT), Akash\nAnumarlapudi (UWM), Gaurav Waratkar (IITB), Harsh Kumar (IITB), Anirudh\nSalgundi (IITB), Vishwajeet Swain (IITB), Theophile du Laz (CIT), Igor\nAndreoni (UMD), Michael Coughlin (UMN), Mansi Kasliwal (CIT), Varun\nBhalerao (IITB), Simeon Reusch (DESY), Jannis Necker (DESY), Shreya Anand\n(CIT), Eric Bellm (UW), Brian Healy (UMN), S. B. Cenko (UMD), D. Kaplan\n(UWM), D. Perley (LJMU) report on behalf of the ZTF and GROWTH\ncollaborations:\n\n\nWe observed the localization region of the LVC trigger S230529ay as part of\nroutine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al.,\n2019) survey operations. We obtained images in the r, i, and g bands\nbeginning at 2023-05-30T04:13:34.003 UT (10 hours after the LVC trigger\ntime), covering ~7% of the probability enclosed in the localization region.\n\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through\nFritz (Coughlin et al. 2023) and emgwcave (Karambelkar et al. in prep),\nAMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021).\nWe required at least 2 detections separated by at least 15 minutes to\nselect against moving objects. Furthermore, we cross-match our candidates\nwith the Minor Planet Center to flag known asteroids, reject stellar\nsources (Tachibana and Miller 2018), and apply machine learning algorithms\n(Mahabal et al. 2019). We require that no spatially coincident ZTF alerts\nwere issued before the detection time of the LVC trigger. We also run\nforced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry\net al. 2018, Smith et al. 2020) and require no detections before the LVC\ntrigger.\n\n\nOne source passed our criteria and is inside the 95% error region:\n\n|-----------------------------------------------------------------------------------------------------\n| id | alias | ra | dec | mjd |\nmag±err (ab) | filter |\n|-----------------------------------------------------------------------------------------------------\n| ZTF23aamnpce | AT2023jtt | 235.9839 | 15.2248 | 60094.23830 |\n20.49±0.23 | r |\n|-----------------------------------------------------------------------------------------------------\n\n\nAT2023jtt is 0.5\" from a galaxy that has a photometric redshift of\nphotoz=0.22±0.06 from the Legacy Survey DR8 (Duncan, 2022), suggesting that\nit is probably not associated with the LVC trigger.\n\nFurther follow-up of this localization region will continue as part of\nregular survey operations.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,\nUSA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,\nGermany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;\nIITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.\nZTF acknowledges the generous support of the NSF under AST MSIP Grant No\n1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant\nNo 1545949. Alert distribution service provided by DIRAC@UW (Patterson et\nal. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019)\nand Kowalski (Duev et al. 2019). GROWTH India telescope is located at the\nIndian Astronomical Observatory (Hanle), operated by the Indian Institute\nof Astrophysics (IIA). GROWTH-India project is supported by SERB and\nadministered by IUSSTF, under grant number IUSSTF/PIRE\nProgram/GROWTH/2015-16 and IUCAA.\n\n",
"published": "2023-05-31T03:32:43.072029Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-31T03:32:43.072051Z",
"modified": "2023-05-31T03:32:43.076722Z",
"nonlocalizedevents": [
{
"event_id": "S230529a"
}
],
"targets": []
},
{
"id": 1585,
"topic": "gcn.circular",
"uuid": "f5e23d2e-80ed-429c-a9c2-12e92c3f7fa5",
"title": "Fermi trigger No 712143685: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/07/27 23:16:06 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34277",
"subject": "Fermi trigger No 712143685: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB230727.40 (trigger No 712143685,08h 45m 55.92s , +67d 25m 58.8s, R5.95) errorbox 46132 sec after notice time and 46164 sec after trigger time at 2023-07-27 22:30:45 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 83 deg. The sun altitude is -26.1 deg.\n\nThe galactic latitude b = 36 deg., longitude l = 148 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"45798\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 46255 | 2023-07-27 22:30:45 | MASTER-Tavrida | (12h 21m 30.58s , +42d 33m 27.5s) | C | 180 | 15.0 |\n 46444 | 2023-07-27 22:33:54 | MASTER-Tavrida | (12h 21m 35.57s , +42d 34m 12.3s) | C | 180 | 15.5 |\n 46632 | 2023-07-27 22:37:02 | MASTER-Tavrida | (12h 21m 29.13s , +42d 34m 57.1s) | C | 180 | 15.3 |\n 46836 | 2023-07-27 22:40:26 | MASTER-Tavrida | (07h 12m 38.43s , +71d 49m 39.5s) | C | 180 | 14.2 |\n 47032 | 2023-07-27 22:43:42 | MASTER-Tavrida | (08h 44m 07.94s , +76d 40m 35.0s) | C | 180 | 17.6 |\n 47225 | 2023-07-27 22:46:55 | MASTER-Tavrida | (08h 50m 09.42s , +74d 46m 02.6s) | C | 180 | 17.6 |\n 48071 | 2023-07-27 23:01:01 | MASTER-Tavrida | (08h 52m 20.39s , +76d 39m 48.2s) | C | 180 | 17.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwNDk5NzcxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JE5SkmU67RfpCzfCF12vk-xWQHDZBSk8Hc1wNNK9rYU\n\n",
"published": "2023-07-27T23:16:16.292937Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-27T23:16:16.292973Z",
"modified": "2023-07-27T23:16:16.303833Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
