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{
"id": 101,
"topic": "hermes.message",
"uuid": "431a8f1e-3f13-48c4-8faf-3094bb4d63a5",
"title": "INTEGRAL follow-up of S230528bt",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230528bt at 2023-05-28T14:51:29.000\n\n\nSPI-ACS excesses:\nat T0+0.38 FAP = 0.014\nat T0+2.68 FAP = 0.097\nat T0+3.71 FAP = 0.173\nat T0+39.66 FAP = 0.419\nat T0+-22.27 FAP = 0.814\nat T0+273.18 FAP = 0.831\nat T0+-185.07 FAP = 0.859\nat T0+15.28 FAP = 0.893\nat T0+7.93 FAP = 0.903\nat T0+-86.22 FAP = 0.985\n\n\n\n\nnext break in data in 49 hr: 2023-05-30T15:45:39, for 9.3 hr",
"published": "2023-05-28T15:05:48.871206Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-05-28T15:05:48.871226Z",
"modified": "2023-05-28T15:05:48.876271Z",
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},
{
"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",
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{
"id": 103,
"topic": "igwn.gwalert",
"uuid": "3433596f-9866-457e-b211-a772daecdb3b",
"title": "S230529p - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2023-05-29T10:28:13Z",
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},
"message_text": "",
"published": "2023-05-29T10:28:15.119157Z",
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{
"id": 104,
"topic": "igwn.gwalert",
"uuid": "63306974-3dbf-4ba6-93b3-3b8bbc84b061",
"title": "S230529p - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 105,
"topic": "hermes.message",
"uuid": "876d549f-74b1-498e-aa19-3b5d32ca86c1",
"title": "INTEGRAL follow-up of S230529p",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230529p at 2023-05-29T10:27:44.000\n\n\nSPI-ACS excesses:\nat T0+3.62 FAP = 0.021\nat T0+15.39 FAP = 0.098\nat T0+-11.11 FAP = 0.241\nat T0+247.22 FAP = 0.516\nat T0+-159.16 FAP = 0.867\nat T0+54.12 FAP = 0.99\nat T0+16.89 FAP = 0.991\n\n\n\n\nnext break in data in 29 hr: 2023-05-30T15:45:39, for 9.3 hr",
"published": "2023-05-29T10:40:38.263776Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-05-29T10:40:38.263813Z",
"modified": "2023-05-29T10:40:38.274559Z",
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{
"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",
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{
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}
],
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},
{
"id": 107,
"topic": "igwn.gwalert",
"uuid": "501b0a53-15d1-4d02-a0bb-3f6a76eb3718",
"title": "S230529ay - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230529ay/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230529ay/view/"
},
"event": {
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"time": "2023-05-29T18:15:00.746Z",
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"area_90": 8.594366926962348,
"duration": null,
"pipeline": "pycbc",
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"HasMassGap": 0.9847387913344903,
"HasRemnant": 0.12057811461919889
},
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],
"significant": true,
"skymap_hash": "27e093b82033277b3693344e16cac52b",
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"BNS": 0.30601513334446906,
"NSBH": 0.6240278234757632,
"Terrestrial": 0.0699570431797677
},
"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-05-29T18:15:26Z",
"superevent_id": "S230529ay",
"external_coinc": null
},
"message_text": "",
"published": "2023-05-29T18:15:28.627837Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-05-29T18:15:28.627862Z",
"modified": "2023-05-29T18:15:28.634149Z",
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},
{
"id": 108,
"topic": "igwn.gwalert",
"uuid": "1a876cbb-ec62-4116-874d-c249e9c85c99",
"title": "S230529ay - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230529ay/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230529ay/view/"
},
"event": {
"far": 1.975121185032117e-10,
"time": "2023-05-29T18:15:00.746Z",
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"area_90": 8.594366926962348,
"duration": null,
"pipeline": "pycbc",
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"HasMassGap": 0.9847387913344903,
"HasRemnant": 0.12057811461919889
},
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],
"significant": true,
"skymap_hash": "27e093b82033277b3693344e16cac52b",
"classification": {
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"BNS": 0.30601513334446906,
"NSBH": 0.6240278234757632,
"Terrestrial": 0.0699570431797677
},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-05-29T18:20:15Z",
"superevent_id": "S230529ay",
"external_coinc": null
},
"message_text": "",
"published": "2023-05-29T18:20:16.316501Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-05-29T18:20:16.316525Z",
"modified": "2023-05-29T18:20:16.321345Z",
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},
{
"id": 109,
"topic": "igwn.gwalert",
"uuid": "2270c12b-4e70-4b11-bb87-4e99e41991d5",
"title": "S230529ay - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230529ay/view/"
},
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"time": "2023-05-29T18:15:00.746Z",
"group": "CBC",
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"area_90": 8.594366926962348,
"duration": null,
"pipeline": "pycbc",
"properties": {
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"HasMassGap": 0.9847387913344903,
"HasRemnant": 0.12057811461919889
},
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],
"significant": true,
"skymap_hash": "27e093b82033277b3693344e16cac52b",
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"BNS": 0.30601513334446906,
"NSBH": 0.6240278234757632,
"Terrestrial": 0.0699570431797677
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-05-29T18:27:30Z",
"superevent_id": "S230529ay",
"external_coinc": null
},
"message_text": "",
"published": "2023-05-29T18:27:32.593681Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-05-29T18:27:32.593707Z",
"modified": "2023-05-29T18:27:32.598636Z",
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},
{
"id": 110,
"topic": "hermes.message",
"uuid": "75a5a980-dd01-4f18-9124-3e4fca639d53",
"title": "INTEGRAL follow-up of S230529ay",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230529ay at 2023-05-29T18:15:00.000\n\n\nSPI-ACS excesses:\nat T0+263.21 FAP = 0.225\nat T0+263.21 FAP = 0.225\nat T0+263.21 FAP = 0.225\nat T0+263.21 FAP = 0.225\nat T0+-11.22 FAP = 0.347\nat T0+-5.84 FAP = 0.648\nat T0+-90.52 FAP = 0.751\n\n\n\n\nnext break in data in 22 hr: 2023-05-30T15:45:39, for 9.3 hr",
"published": "2023-05-29T18:29:41.819518Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-05-29T18:29:41.819538Z",
"modified": "2023-05-29T18:29:41.824304Z",
"nonlocalizedevents": [],
"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": 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": 120,
"topic": "hermes.message",
"uuid": "5cd9d812-dd60-4198-98d8-25fd04d335c5",
"title": "INTEGRAL follow-up of S230531f",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230531f at 2023-05-31T00:21:25.000\n\n\n\n\n\nbreak since 8.6 hr next data in 0.68 hr",
"published": "2023-05-31T00:34:38.923356Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-05-31T00:34:38.923387Z",
"modified": "2023-05-31T00:34:38.930874Z",
"nonlocalizedevents": [],
"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": 124,
"topic": "gcn.circular",
"uuid": "5f441ece-3cc6-4a88-a180-fa98e51b9ea9",
"title": "GRB 230525A: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/05/31 06:20:08 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "33901",
"subject": "GRB 230525A: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\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 short GRB 230525A (Fermi-GBM Final Localization: The\nFermi GBM team, GCN Circ. 33877; Fermi-GBM detection: The Fermi\nGBM team, GCN Circ. 33879) was detected in the ground analysis of\nthe CALET Gamma-ray Burst Monitor (CGBM) data around\n10:46:08.33 UTC on 25 May 2023 (referenced to GCN Circ 33879).\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows a short pulse around the reference time.\nWe are not able to obtain the duration because no event data is available\nfor ground-detected events.\n\nThe ground-processed light curve is available at\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1369046781/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n",
"published": "2023-05-31T06:20:16.889562Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-31T06:20:16.889666Z",
"modified": "2023-05-31T06:20:16.902033Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 125,
"topic": "gcn.circular",
"uuid": "c428eeaf-c276-4a36-abc9-b7eebb095a80",
"title": "LIGO/Virgo S230531f: 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": "23/05/31 06:24:44 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33902",
"subject": "LIGO/Virgo S230531f: 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 S230531f errorbox 18909 sec after notice time and 19920 sec after trigger time at 2023-05-31 05:53:25 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 47 deg. The sun altitude is -69.7 deg.\n\nThe galactic latitude b = 21 deg., longitude l = 158 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011920\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 20010 | 2023-05-31 05:53:25 | MASTER-OAFA | (21h 47m 17.84s , -50d 05m 55.5s) | C | 180 | 17.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-05-31T06:24:49.565820Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-05-31T06:24:49.565842Z",
"modified": "2023-05-31T06:24:49.571057Z",
"nonlocalizedevents": [
{
"event_id": "S230531f"
}
],
"targets": []
},
{
"id": 126,
"topic": "igwn.gwalert",
"uuid": "7fda973d-4441-47b8-b7bb-f88e1aef6a23",
"title": "S230601bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230601bf/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230601bf/view/"
},
"event": {
"far": 7.823133868916789e-09,
"time": "2023-06-01T22:41:34.096Z",
"group": "CBC",
"search": "AllSky",
"area_50": 797.9584331845172,
"area_90": 2965.2244485310525,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0016666666666666666,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "84e63b32046e1965f56bf53bbfc3ba28",
"classification": {
"BBH": 0.994389357818161,
"BNS": 1.4784633358368251e-33,
"NSBH": 1.159482883595884e-31,
"Terrestrial": 0.005610642181839043
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-01T22:42:04Z",
"superevent_id": "S230601bf",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-01T22:42:06.119877Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-01T22:42:06.119923Z",
"modified": "2023-06-01T22:42:06.127248Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 127,
"topic": "igwn.gwalert",
"uuid": "e8298f79-eab4-4ed8-871c-f46b1dfd4021",
"title": "S230601bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230601bf/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230601bf/view/"
},
"event": {
"far": 1.713566498778526e-15,
"time": "2023-06-01T22:41:34.096Z",
"group": "CBC",
"search": "AllSky",
"area_50": 633.666702134431,
"area_90": 2108.305636770451,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0022222222222222222,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "2a555e98e82ca325aa3234b4cd65ec2b",
"classification": {
"BBH": 0.9999999935572232,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 6.442776756543367e-09
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-01T22:46:48Z",
"superevent_id": "S230601bf",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-01T22:46:49.963882Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-01T22:46:49.963920Z",
"modified": "2023-06-01T22:46:49.969305Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 128,
"topic": "hermes.message",
"uuid": "11455c57-f494-4c3a-8d59-7d2aa3e09f38",
"title": "INTEGRAL follow-up of S230601bf",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230601bf at 2023-06-01T22:41:34.000\n\n\nSPI-ACS excesses:\nat T0+-6.8 FAP = 0.086\nat T0+-165.18 FAP = 0.684\nat T0+18.77 FAP = 0.704\nat T0+73.1 FAP = 0.771\nat T0+16.72 FAP = 0.793\nat T0+-283.53 FAP = 0.962\n\n\n\n\nnext break in data in 7.8 hr: 2023-06-02T06:28:10, for 10 hr",
"published": "2023-06-01T22:53:56.421999Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-01T22:53:56.422033Z",
"modified": "2023-06-01T22:53:56.427584Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 129,
"topic": "igwn.gwalert",
"uuid": "eeec3695-502e-41a9-b5a6-d632877e8b57",
"title": "S230601bf - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230601bf/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230601bf/view/"
},
"event": {
"far": 1.713566498778526e-15,
"time": "2023-06-01T22:41:34.096Z",
"group": "CBC",
"search": "AllSky",
"area_50": 633.666702134431,
"area_90": 2108.305636770451,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0022222222222222222,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "2a555e98e82ca325aa3234b4cd65ec2b",
"classification": {
"BBH": 0.9999999935572232,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 6.442776756543367e-09
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-06-01T23:08:49Z",
"superevent_id": "S230601bf",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-01T23:08:50.576435Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-01T23:08:50.576473Z",
"modified": "2023-06-01T23:08:50.581882Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 130,
"topic": "gcn.circular",
"uuid": "78699e81-1c9e-4df7-859e-5a9340b2a644",
"title": "LIGO/Virgo/KAGRA S230601bf: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"data": {
"date": "23/06/01 23:28:00 GMT",
"from": "S. P. Stevenson at Swinburne University of Technology <simon.stevenson@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33903",
"subject": "LIGO/Virgo/KAGRA S230601bf: 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 S230601bf during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-01 22:41:34.101 UTC (GPS\ntime: 1369694512.101). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], oLIB [4], PyCBC Live [5], and SPIIR [6] analysis\npipelines.\n\nS230601bf is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.7e-15 Hz, or about one in 1e7\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230601bf\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<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%. [7] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [7] 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 [8], distributed via GCN notice about 31 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [8], 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\n2109 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3578 +/- 998 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] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [4] Lynch et al. PRD 95, 104046 (2017)\n [5] Dal Canton et al. ApJ 923, 254 (2021)\n [6] Chu et al. PRD 105, 024023 (2022)\n [7] Chatterjee et al. The Astrophysical Journal 896, 54 (2020)\n [8] Singer & Price PRD 93, 024013 (2016)\n\n",
"published": "2023-06-01T23:28:13.323557Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-01T23:28:13.323577Z",
"modified": "2023-06-01T23:28:13.328720Z",
"nonlocalizedevents": [
{
"event_id": "S230601b"
}
],
"targets": []
},
{
"id": 131,
"topic": "gcn.circular",
"uuid": "7f4deff2-a564-429f-9e22-eee2905fe8e4",
"title": "LIGO/Virgo S230601bf: 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": "23/06/02 13:46:39 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33904",
"subject": "LIGO/Virgo S230601bf: 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 S230601bf errorbox 86 sec after trigger time at 2023-06-01 22:43:00 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 45 deg. The sun altitude is -80.0 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the LIGO/Virgo S230601bf errorbox 543 sec after trigger time at 2023-06-01 22:50:37 UT, with upper limit up to 16.9 mag. Observations started at twilight. The observations began at zenith distance = 73 deg. The sun altitude is -14.9 deg.\n\nThe galactic latitude b = 19 deg., longitude l = 197 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011922\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 92 | 2023-06-01 22:43:00 | MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) | C | 10 | 17.2 |\n 117 | 2023-06-01 22:43:00 | MASTER-SAAO | (20h 25m 56.59s , -39d 52m 05.8s) | C | 60 | 18.4 | Coadd\n 92 | 2023-06-01 22:43:00 | MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) | C | 10 | 17.3 |\n 117 | 2023-06-01 22:43:00 | MASTER-SAAO | (20h 24m 51.97s , -39d 51m 33.9s) | C | 60 | 18.4 | Coadd\n 126 | 2023-06-01 22:43:29 | MASTER-SAAO | (20h 26m 02.38s , -39d 51m 46.0s) | C | 20 | 17.7 |\n 126 | 2023-06-01 22:43:29 | MASTER-SAAO | (20h 24m 57.73s , -39d 51m 14.1s) | C | 20 | 17.7 |\n 182 | 2023-06-01 22:44:20 | MASTER-SAAO | (20h 25m 59.84s , -39d 50m 18.5s) | C | 30 | 17.9 |\n 182 | 2023-06-01 22:44:20 | MASTER-SAAO | (20h 24m 55.25s , -39d 49m 46.7s) | C | 30 | 18.0 |\n 236 | 2023-06-01 22:45:10 | MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) | C | 40 | 18.1 |\n 296 | 2023-06-01 22:45:10 | MASTER-SAAO | (20h 25m 59.76s , -39d 51m 50.8s) | C | 160 | 19.0 | Coadd\n 236 | 2023-06-01 22:45:10 | MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.1s) | C | 40 | 18.2 |\n 296 | 2023-06-01 22:45:10 | MASTER-SAAO | (20h 24m 55.12s , -39d 51m 18.2s) | C | 160 | 19.1 | Coadd\n 301 | 2023-06-01 22:46:09 | MASTER-SAAO | (20h 26m 02.28s , -39d 50m 14.3s) | C | 50 | 18.1 |\n 301 | 2023-06-01 22:46:09 | MASTER-SAAO | (20h 24m 57.64s , -39d 49m 42.0s) | C | 50 | 18.3 |\n 392 | 2023-06-01 22:47:30 | MASTER-SAAO | (20h 25m 57.11s , -39d 51m 06.3s) | C | 70 | 18.4 |\n 392 | 2023-06-01 22:47:30 | MASTER-SAAO | (20h 24m 52.44s , -39d 50m 32.7s) | C | 70 | 18.5 |\n 503 | 2023-06-01 22:49:11 | MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.4s) | C | 90 | 18.7 |\n 503 | 2023-06-01 22:49:11 | MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.1s) | C | 90 | 18.6 |\n 628 | 2023-06-01 22:49:11 | MASTER-SAAO | (20h 24m 51.59s , -39d 49m 33.3s) | C | 340 | 19.4 | Coadd\n 628 | 2023-06-01 22:49:11 | MASTER-SAAO | (20h 25m 56.26s , -39d 50m 07.0s) | C | 340 | 19.5 | Coadd\n 598 | 2023-06-01 22:50:37 | MASTER-OAFA | (07h 28m 41.32s , +23d 12m 59.6s) | C | 110 | 16.2 |\n 748 | 2023-06-01 22:50:37 | MASTER-OAFA | (07h 28m 41.33s , +23d 12m 59.5s) | C | 410 | 16.9 | Coadd\n 623 | 2023-06-01 22:51:01 | MASTER-SAAO | (20h 26m 02.23s , -39d 51m 08.2s) | C | 110 | 18.6 |\n 623 | 2023-06-01 22:51:01 | MASTER-SAAO | (20h 24m 57.50s , -39d 50m 33.1s) | C | 110 | 18.7 |\n 750 | 2023-06-01 22:52:58 | MASTER-OAFA | (07h 28m 46.73s , +23d 13m 32.6s) | C | 130 | 16.1 |\n 779 | 2023-06-01 22:53:23 | MASTER-SAAO | (20h 25m 55.86s , -39d 52m 09.6s) | C | 140 | 18.7 |\n 779 | 2023-06-01 22:53:23 | MASTER-SAAO | (20h 24m 51.07s , -39d 51m 33.1s) | C | 140 | 18.8 |\n 931 | 2023-06-01 22:55:39 | MASTER-OAFA | (07h 28m 44.45s , +23d 14m 48.4s) | C | 170 | 16.6 |\n 1138 | 2023-06-01 22:59:01 | MASTER-OAFA | (07h 28m 44.40s , +23d 13m 39.6s) | C | 180 | 16.5 |\n 2232 | 2023-06-01 23:17:15 | MASTER-OAFA | (07h 28m 43.73s , +23d 14m 28.1s) | C | 180 | 15.8 |\n 2443 | 2023-06-01 23:20:46 | MASTER-OAFA | (07h 28m 43.70s , +23d 13m 13.2s) | C | 180 | 16.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-02T13:46:46.991458Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-02T13:46:46.991480Z",
"modified": "2023-06-02T13:46:46.998868Z",
"nonlocalizedevents": [
{
"event_id": "S230601b"
}
],
"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": 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": 134,
"topic": "igwn.gwalert",
"uuid": "5d1cd20d-99b4-4980-a6eb-0f466492d1ed",
"title": "S230602ap - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230602ap/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230602ap/view/"
},
"event": {
"far": 1.48135e-06,
"time": "2023-06-02T18:40:16.676Z",
"group": "Burst",
"search": "AllSky",
"area_50": 375.16425940939166,
"area_90": 1300.0658564320977,
"duration": 0.035156,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "125fdd996d673615049fb2fe3a7e0359",
"classification": {},
"skymap_version": 0,
"central_frequency": 305.918823
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-02T18:46:54Z",
"superevent_id": "S230602ap",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-02T18:46:55.642654Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-02T18:46:55.642677Z",
"modified": "2023-06-02T18:46:55.648690Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 135,
"topic": "igwn.gwalert",
"uuid": "e748e3af-8414-4b7f-8070-9be61fb4d723",
"title": "S230602ap - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230602ap/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230602ap/view/"
},
"event": {
"far": 1.48135e-06,
"time": "2023-06-02T18:40:16.676Z",
"group": "Burst",
"search": "AllSky",
"area_50": 375.16425940939166,
"area_90": 1300.0658564320977,
"duration": 0.035156,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "125fdd996d673615049fb2fe3a7e0359",
"classification": {},
"skymap_version": 0,
"central_frequency": 305.918823
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-02T18:51:28Z",
"superevent_id": "S230602ap",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-02T18:51:29.330985Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-02T18:51:29.331008Z",
"modified": "2023-06-02T18:51:29.335948Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 136,
"topic": "hermes.message",
"uuid": "933999b4-29dd-44eb-866c-950a53ffe65f",
"title": "INTEGRAL follow-up of S230602ap",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230602ap at 2023-06-02T18:40:16.000\n\n\nSPI-ACS excesses:\nat T0+-53.85 FAP = 0.031\nat T0+-157.62 FAP = 0.282\nat T0+-58.25 FAP = 0.29\nat T0+-116.07 FAP = 0.455\nat T0+-129.1 FAP = 0.703\nat T0+141.73 FAP = 0.772\nat T0+240.8 FAP = 0.813\nat T0+-39.97 FAP = 0.815\nat T0+-23.02 FAP = 0.988\n\n\n\n\nnext break in data in 53 hr: 2023-06-04T23:26:30, for 9.3 hr",
"published": "2023-06-02T18:52:35.440099Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-02T18:52:35.440118Z",
"modified": "2023-06-02T18:52:35.445017Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 137,
"topic": "gcn.circular",
"uuid": "8af4a663-f9f6-4bcb-9a28-35a15120f9f4",
"title": "LIGO/Virgo/KAGRA S230518h: Upper limits from a two-week IceCube neutrino search",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/06/02 22:04:10 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33907",
"subject": "LIGO/Virgo/KAGRA S230518h: Upper limits from a two-week IceCube neutrino search"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed an additional search [1] for track-like muon neutrino events consistent with the sky localization of gravitational-wave candidate S230518h in a time range of -0.1 day, +14 days from the alert event time (2023-05-18 10:35:08.016 UTC to 2023-06-01 12:59:08.016 UTC).\n\nDuring this time period IceCube was collecting good quality data. In this case, we report a p-value of 0.73, consistent with no significant excess of track events. IceCube'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 the 4-Update map ranges from 0.028 to 1.219 GeV cm^-2 in this 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] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n\n",
"published": "2023-06-02T22:04:19.088698Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-02T22:04:19.088717Z",
"modified": "2023-06-02T22:04:19.095801Z",
"nonlocalizedevents": [
{
"event_id": "S230518h"
}
],
"targets": []
},
{
"id": 138,
"topic": "igwn.gwalert",
"uuid": "fcee3a47-695d-49c6-8922-34a2777c420d",
"title": "S230603aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230603aa/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230603aa/view/"
},
"event": {
"far": 1.154570459497884e-06,
"time": "2023-06-03T07:34:45.081Z",
"group": "CBC",
"search": "AllSky",
"area_50": 867.6198057370439,
"area_90": 3565.319404857037,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.000689655172413793,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "7e29fdec84eaf30fe0e83c6996753fad",
"classification": {
"BBH": 0.005404270988081028,
"BNS": 0.0,
"NSBH": 0.02586428498974366,
"Terrestrial": 0.9687314440221753
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-03T07:35:11Z",
"superevent_id": "S230603aa",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-03T07:35:12.008487Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-03T07:35:12.008512Z",
"modified": "2023-06-03T07:35:12.017071Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 139,
"topic": "igwn.gwalert",
"uuid": "96aabc2d-3ffc-4398-81c2-de189246f819",
"title": "S230603aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230603aa/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230603aa/view/"
},
"event": {
"far": 1.154570459497884e-06,
"time": "2023-06-03T07:34:45.081Z",
"group": "CBC",
"search": "AllSky",
"area_50": 867.6198057370439,
"area_90": 3565.319404857037,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.000689655172413793,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "7e29fdec84eaf30fe0e83c6996753fad",
"classification": {
"BBH": 0.005404270988081028,
"BNS": 0.0,
"NSBH": 0.02586428498974366,
"Terrestrial": 0.9687314440221753
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-03T07:39:46Z",
"superevent_id": "S230603aa",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-03T07:39:47.817820Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-03T07:39:47.817847Z",
"modified": "2023-06-03T07:39:47.822369Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 140,
"topic": "hermes.message",
"uuid": "876bbde9-7d79-4761-a997-673a9f344157",
"title": "INTEGRAL follow-up of S230603aa",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230603aa at 2023-06-03T07:34:45.000\n\n\nSPI-ACS excesses:\nat T0+-31.64 FAP = 0.278\nat T0+-25.01 FAP = 0.314\nat T0+187.19 FAP = 0.347\nat T0+61.41 FAP = 0.385\nat T0+-11.21 FAP = 0.568\n\n\n\n\nnext break in data in 40 hr: 2023-06-04T23:26:30, for 9.3 hr",
"published": "2023-06-03T07:47:05.111402Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-03T07:47:05.111441Z",
"modified": "2023-06-03T07:47:05.117564Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 141,
"topic": "gcn.circular",
"uuid": "d6ee79ce-b9c1-4644-a74e-07d6496cc13c",
"title": "LIGO/Virgo S230602ap: 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": "23/06/03 07:48:43 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33908",
"subject": "LIGO/Virgo S230602ap: 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 S230602ap errorbox 46171 sec after notice time and 46590 sec after trigger time at 2023-06-03 07:36:46 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 80 deg. The sun altitude is -48.2 deg.\n\nThe galactic latitude b = -1 deg., longitude l = 120 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011926\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 46601 | 2023-06-03 07:36:46 | MASTER-OAFA | (17h 16m 22.77s , +41d 22m 00.9s) | C | 20 | 15.9 |\n 46657 | 2023-06-03 07:37:38 | MASTER-OAFA | (17h 16m 20.68s , +41d 23m 37.1s) | C | 30 | 16.0 |\n 46723 | 2023-06-03 07:38:39 | MASTER-OAFA | (17h 16m 20.54s , +41d 22m 11.6s) | C | 40 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-03T07:48:52.441658Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-03T07:48:52.441678Z",
"modified": "2023-06-03T07:48:52.446620Z",
"nonlocalizedevents": [
{
"event_id": "S230602a"
}
],
"targets": []
},
{
"id": 142,
"topic": "gcn.circular",
"uuid": "2dd684f0-ac7e-44df-b552-f1d92fb12305",
"title": "LIGO/Virgo S230603aa: 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": "23/06/03 07:48:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33909",
"subject": "LIGO/Virgo S230603aa: 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 S230603aa errorbox 52 sec after notice time and 121 sec after trigger time at 2023-06-03 07:36:46 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 80 deg. The sun altitude is -48.2 deg.\n\nThe galactic latitude b = 34 deg., longitude l = 66 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011930\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 132 | 2023-06-03 07:36:46 | MASTER-OAFA | (17h 16m 22.77s , +41d 22m 00.9s) | C | 20 | 15.9 |\n 188 | 2023-06-03 07:37:38 | MASTER-OAFA | (17h 16m 20.68s , +41d 23m 37.1s) | C | 30 | 16.0 |\n 254 | 2023-06-03 07:38:39 | MASTER-OAFA | (17h 16m 20.54s , +41d 22m 11.6s) | C | 40 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-03T07:48:54.487587Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-03T07:48:54.487625Z",
"modified": "2023-06-03T07:48:54.492959Z",
"nonlocalizedevents": [
{
"event_id": "S230603a"
}
],
"targets": []
},
{
"id": 143,
"topic": "gcn.circular",
"uuid": "7385beb9-6630-4fb8-9386-290c86c52b6a",
"title": "GRB 230603A: 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": "23/06/03 12:45:56 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33910",
"subject": "GRB 230603A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 12:35:29 UT on 3 Jun 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230603A (trigger 707488534.44648 / 230603525).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 294.5, Dec = -11.6 (J2000 degrees, equivalent to J2000 19h 37m, -11d 35'), with a statistical uncertainty of 3.6 degrees.\n\nThe angle from the Fermi LAT boresight is 38.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230603525/quicklook/glg_skymap_all_bn230603525.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/bn230603525/quicklook/glg_healpix_all_bn230603525.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230603525/quicklook/glg_lc_medres34_bn230603525.gif\n\n",
"published": "2023-06-03T12:46:05.131264Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-03T12:46:05.131285Z",
"modified": "2023-06-03T12:46:05.137358Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 144,
"topic": "gcn.circular",
"uuid": "8a742f8b-b669-45cc-9b66-aee3021ae277",
"title": "IceCube-230603A - 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": "23/06/03 15:14:00 GMT",
"from": "Dr. Massimiliano Lincetto at Ruhr-Universitaet Bochum <lincetto@astro.rub.de>",
"title": "GCN CIRCULAR",
"number": "33911",
"subject": "IceCube-230603A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-06-03 at 05:00:47.13 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 1.24 events per year\ndue to atmospheric \nbackgrounds.\nThe IceCube detector was in a normal operating state at the time of\ndetection.\n\nAfter the initial automated alert\n(https://gcn.gsfc.nasa.gov/notices_amon_g_b/138005_24780443.amon), more\nsophisticated reconstruction algorithms have been applied offline, with\nthe direction refined to:\n\nDate: 2023-06-03\nTime: 05:00:47.13 UT\nRA: 68.20 (+2.62 / -3.06 deg 90% PSF containment) J2000\nDec: +24.21 (+2.08 / -2.59 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\nNo gamma-ray sources listed in the 4FGL-DR3 Fermi-LAT catalog are\nlocated within the 90% uncertainty region. The nearest source is 4FGL\nJ0439.2+2151, located 2.79 deg away from the best-fit alert position.\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": "2023-06-03T15:14:12.516662Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-03T15:14:12.516681Z",
"modified": "2023-06-03T15:14:12.524345Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 145,
"topic": "igwn.gwalert",
"uuid": "c898a88f-ff5e-46de-83c1-a8ef8989ece1",
"title": "S230604z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230604z/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230604z/view/"
},
"event": {
"far": 2.693441465960436e-07,
"time": "2023-06-04T09:20:31.321Z",
"group": "CBC",
"search": "AllSky",
"area_50": 287.3007059263476,
"area_90": 2480.952015244209,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.5941427725688592,
"HasMassGap": 0.01661064425770308,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "057ad1c642ee72f1219ebd38dd8a5528",
"classification": {
"BBH": 0.7061956992397619,
"BNS": 3.6054262797413515e-19,
"NSBH": 0.0423002585795029,
"Terrestrial": 0.2515040421807352
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-04T09:21:10Z",
"superevent_id": "S230604z",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-04T09:21:11.556648Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-04T09:21:11.556672Z",
"modified": "2023-06-04T09:21:11.564338Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 146,
"topic": "igwn.gwalert",
"uuid": "34bcf6b6-aa8a-4a36-b8da-53118dc9736e",
"title": "S230604z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230604z/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230604z/view/"
},
"event": {
"far": 2.693441465960436e-07,
"time": "2023-06-04T09:20:31.321Z",
"group": "CBC",
"search": "AllSky",
"area_50": 287.3007059263476,
"area_90": 2480.952015244209,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.5941427725688592,
"HasMassGap": 0.01661064425770308,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "057ad1c642ee72f1219ebd38dd8a5528",
"classification": {
"BBH": 0.7061956992397619,
"BNS": 3.6054262797413515e-19,
"NSBH": 0.0423002585795029,
"Terrestrial": 0.2515040421807352
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-04T09:25:45Z",
"superevent_id": "S230604z",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-04T09:25:46.574662Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-04T09:25:46.574687Z",
"modified": "2023-06-04T09:25:46.579392Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 147,
"topic": "gcn.circular",
"uuid": "d65efa0f-5447-4d38-96f3-b5399a61d147",
"title": "LIGO/Virgo S230604z: 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": "23/06/04 09:32:38 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33912",
"subject": "LIGO/Virgo S230604z: 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 S230604z errorbox 168 sec after notice time and 254 sec after trigger time at 2023-06-04 09:24:45 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 39 deg. The sun altitude is -25.4 deg.\n\nThe galactic latitude b = -62 deg., longitude l = 85 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011934\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 280 | 2023-06-04 09:24:45 | MASTER-OAFA | (23h 39m 21.01s , -04d 07m 15.8s) | C | 50 | 17.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-04T09:32:49.931571Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-04T09:32:49.931591Z",
"modified": "2023-06-04T09:32:49.936837Z",
"nonlocalizedevents": [
{
"event_id": "S230604z"
}
],
"targets": []
},
{
"id": 148,
"topic": "hermes.message",
"uuid": "d0899f7b-5e68-4e36-ba05-5d92ada6fec1",
"title": "INTEGRAL follow-up of S230604z",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230604z at 2023-06-04T09:20:31.000\n\n\nSPI-ACS excesses:\nat T0+1.68 FAP = 0.007\nat T0+24.43 FAP = 0.094\nat T0+83.98 FAP = 0.173\nat T0+-116.07 FAP = 0.271\nat T0+-242.52 FAP = 0.34\nat T0+-39.17 FAP = 0.409\nat T0+6.4 FAP = 0.635\nat T0+-14.62 FAP = 0.688\nat T0+46.48 FAP = 0.733\n\n\n\n\nnext break in data in 14 hr: 2023-06-04T23:26:30, for 9.3 hr",
"published": "2023-06-04T09:33:32.293363Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-04T09:33:32.293426Z",
"modified": "2023-06-04T09:33:32.298432Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 149,
"topic": "igwn.gwalert",
"uuid": "46d059ab-6eda-4298-b322-ebea2145fba2",
"title": "S230605o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230605o/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230605o/view/"
},
"event": {
"far": 1.705496074225415e-12,
"time": "2023-06-05T06:53:43.493Z",
"group": "CBC",
"search": "AllSky",
"area_50": 352.24105172456166,
"area_90": 1420.7143179312027,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "3f7045a8a4df5f69e8355147eebda7f7",
"classification": {
"BBH": 0.9999969581871078,
"BNS": 2.585750205322853e-25,
"NSBH": 1.7434438952535805e-23,
"Terrestrial": 3.0418128922349297e-06
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-05T06:54:06Z",
"superevent_id": "S230605o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-05T06:54:07.943262Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-05T06:54:07.943285Z",
"modified": "2023-06-05T06:54:07.951276Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 150,
"topic": "hermes.message",
"uuid": "465d6380-643e-40b6-9415-e12dd7be999d",
"title": "INTEGRAL follow-up of S230605o",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230605o at 2023-06-05T06:53:43.000\n\n\n\n\n\nbreak since 7.5 hr next data in 1.8 hr",
"published": "2023-06-05T06:54:31.050019Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-05T06:54:31.050051Z",
"modified": "2023-06-05T06:54:31.054997Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 151,
"topic": "igwn.gwalert",
"uuid": "14e71472-ffb2-4c8e-a2ec-61d41b927bbb",
"title": "S230605o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230605o/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230605o/view/"
},
"event": {
"far": 4.521287e-09,
"time": "2023-06-05T06:53:43.493Z",
"group": "CBC",
"search": "AllSky",
"area_50": 402.75603799570877,
"area_90": 1370.3566992185326,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "7d4bfe7c9df8179abf766db83844b646",
"classification": {
"BBH": 0.98770478,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.01229522
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-05T06:58:42Z",
"superevent_id": "S230605o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-05T06:58:43.812476Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-05T06:58:43.812500Z",
"modified": "2023-06-05T06:58:43.817563Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 152,
"topic": "gcn.circular",
"uuid": "9cc32aa9-5b5f-4472-b154-dfe09daf1090",
"title": "LIGO/Virgo S230605o: 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": "23/06/05 07:02:58 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33913",
"subject": "LIGO/Virgo S230605o: 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 S230605o errorbox 14 sec after notice time and 68 sec after trigger time at 2023-06-05 06:54:51 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 36 deg. The sun altitude is -57.4 deg.\n\nThe galactic latitude b = 4 deg., longitude l = 21 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011938\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 74 | 2023-06-05 06:54:51 | MASTER-OAFA | (18h 18m 29.39s , +02d 17m 58.6s) | C | 10 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-05T07:03:09.547997Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T07:03:09.548026Z",
"modified": "2023-06-05T07:03:09.553681Z",
"nonlocalizedevents": [
{
"event_id": "S230605o"
}
],
"targets": []
},
{
"id": 153,
"topic": "igwn.gwalert",
"uuid": "32d2ad54-7826-442f-a63d-c70d47edfd4b",
"title": "S230605o - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230605o/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230605o/view/"
},
"event": {
"far": 4.521287e-09,
"time": "2023-06-05T06:53:43.493Z",
"group": "CBC",
"search": "AllSky",
"area_50": 402.75603799570877,
"area_90": 1370.3566992185326,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "7d4bfe7c9df8179abf766db83844b646",
"classification": {
"BBH": 0.98770478,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.01229522
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-06-05T07:09:54Z",
"superevent_id": "S230605o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-05T07:09:55.492512Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-05T07:09:55.492548Z",
"modified": "2023-06-05T07:09:55.497720Z",
"nonlocalizedevents": [],
"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": 155,
"topic": "gcn.circular",
"uuid": "c547e3de-0a1e-4d16-a3e6-2d766350a4a4",
"title": "GRB 230604A: AstroSat CZTI detection of a short GRB",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/06/05 09:34:09 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "33915",
"subject": "GRB 230604A: AstroSat CZTI detection of a short GRB"
},
"message_text": "G. Waratkar (IITB), P K. Navaneeth (IUCAA), 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 short GRB 230604A which was also detected by KONUS-Wind (IPN_RAW Notices).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-06-04 05:53:48.0 UTC. The measured peak count rate associated with the burst is 669.5 (+184.9, -93.0) counts/s above the background in the combined data of all quadrants, with a total of 357 (+164, -169) counts. The local mean background count rate was 431.1 (+12.1, -15.6) counts/s. Using cumulative rates, we measure a T90 of 1.24 (+0.99, -0.73) 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": "2023-06-05T09:34:18.816676Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T09:34:18.816698Z",
"modified": "2023-06-05T09:34:18.823700Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 156,
"topic": "gcn.circular",
"uuid": "719662f2-e220-4e99-ad72-fec8e8e64c60",
"title": "Super-Kamiokande: Neutrino search for SN2023ixf",
"submitter": "Hop gcn.circular",
"authors": "Yusuke Koshio at Super-Kamiokande <koshio@okayama-u.ac.jp>",
"data": {
"date": "23/06/05 12:30:44 GMT",
"from": "Yusuke Koshio at Super-Kamiokande <koshio@okayama-u.ac.jp>",
"title": "GCN CIRCULAR",
"number": "33916",
"subject": "Super-Kamiokande: Neutrino search for SN2023ixf"
},
"message_text": "M. Nakahata, Kamioka Observatory, Institute for Cosmic Ray Research,\nUniversity of Tokyo, reports on behalf of the Super-Kamiokande collaboration:\n\nSuper-Kamiokande, a 50 ktons water Cherenkov imaging detector situated 1000 meters underground in the Kamioka mine, Gifu, Japan, has searched for neutrino signal correlated with SN2023ixf in a time window 2 days before the detection by Oak St. Observatory (2023-05-17 08:45:13 to 2023-05-19 08:45:13), during which Super-Kamiokande took data stably without dead time. In the electron total energy region between 7.0 MeV and 100 MeV within a fiducial volume of 22.5 ktons, no significant signal was observed.\n\n",
"published": "2023-06-05T12:30:53.709464Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T12:30:53.709484Z",
"modified": "2023-06-05T12:30:53.716183Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 157,
"topic": "igwn.gwalert",
"uuid": "8f180c0c-649a-4e4e-b035-a885bc81d562",
"title": "S230601bf - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230601bf/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230601bf/view/"
},
"event": {
"far": 1.713566498778526e-15,
"time": "2023-06-01T22:41:34.096Z",
"group": "CBC",
"search": "AllSky",
"area_50": 902.8701388359129,
"area_90": 2530.050693489063,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "71f7ede34d664f2ea0c9f91c3f0354f4",
"classification": {
"BBH": 0.9999999935572232,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 6.442776756543367e-09
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-06-05T16:41:40Z",
"superevent_id": "S230601bf",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-05T16:41:41.720280Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-05T16:41:41.720303Z",
"modified": "2023-06-05T16:41:41.726843Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 158,
"topic": "gcn.circular",
"uuid": "0a0452dd-670c-427a-8d47-9400e8910019",
"title": "LIGO/Virgo/KAGRA S230601bf: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Sylvia Biscoveanu at MIT <sylvia.biscoveanu@ligo.org>",
"data": {
"date": "23/06/05 16:54:29 GMT",
"from": "Sylvia Biscoveanu at MIT <sylvia.biscoveanu@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33917",
"subject": "LIGO/Virgo/KAGRA S230601bf: 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 S230601bf (GCN Circular 33903). 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/S230601bf\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 2531 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3565 +/- 1260 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\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n",
"published": "2023-06-05T16:54:41.628814Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T16:54:41.628834Z",
"modified": "2023-06-05T16:54:41.633846Z",
"nonlocalizedevents": [
{
"event_id": "S230601b"
}
],
"targets": []
},
{
"id": 159,
"topic": "gcn.circular",
"uuid": "e97c0e96-ffbb-4862-b019-6ca30f54ea75",
"title": "IceCube-230603A: Upper limits from a search for additional neutrino events in IceCube",
"submitter": "Hop gcn.circular",
"authors": "Sam Hori at IceCube/U Wisc-Madison <sahori@wisc.edu>",
"data": {
"date": "23/06/05 17:02:25 GMT",
"from": "Sam Hori at IceCube/U Wisc-Madison <sahori@wisc.edu>",
"title": "GCN CIRCULAR",
"number": "33918",
"subject": "IceCube-230603A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-230603A (https://gcn.nasa.gov/circulars/33911) in a time range of 1000 seconds centered on the alert event time (2023-06-03 04:52:27.130 UTC to 2023-06-03 05:09:07.130 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-230603A. 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-230603A is 1.4e-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 2e+02 GeV and 8e+04 GeV.\n\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2023-06-02 05:00:47.130 UTC to 2023-06-04 05:00:47.130 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-230603A is 1.7e-01 GeV cm^-2 in a 2 day time window.\n\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<mailto:roc@icecube.wisc.edu>.\n\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n",
"published": "2023-06-05T17:02:33.717507Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T17:02:33.717528Z",
"modified": "2023-06-05T17:02:33.723141Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 160,
"topic": "igwn.gwalert",
"uuid": "3bcc2b79-a460-4bd3-ae94-6c074ec8bdfd",
"title": "S230605o - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230605o/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230605o/view/"
},
"event": {
"far": 4.521287e-09,
"time": "2023-06-05T06:53:43.493Z",
"group": "CBC",
"search": "AllSky",
"area_50": 292.75611462022016,
"area_90": 1077.02357021723,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "d99dae3b7213a16086a7e4e75f6207de",
"classification": {
"BBH": 0.98770478,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.01229522
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-06-05T19:42:44Z",
"superevent_id": "S230605o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-05T19:42:45.376024Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-05T19:42:45.376047Z",
"modified": "2023-06-05T19:42:45.382932Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 161,
"topic": "gcn.circular",
"uuid": "884da015-79d8-4f8e-9030-85dc8c4c4dff",
"title": "LIGO/Virgo/KAGRA S230605o: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"date": "23/06/05 19:53:07 GMT",
"from": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33919",
"subject": "LIGO/Virgo/KAGRA S230605o: 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 S230605o (GCN Circular 33914). 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/S230605o\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1077 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1067 +/- 333 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\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n",
"published": "2023-06-05T19:53:15.889616Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T19:53:15.889635Z",
"modified": "2023-06-05T19:53:15.894856Z",
"nonlocalizedevents": [
{
"event_id": "S230605o"
}
],
"targets": []
},
{
"id": 162,
"topic": "gcn.circular",
"uuid": "5b6877f2-6a90-45f2-b4df-a276537df999",
"title": "Fermi-LAT gamma-ray observations of IceCube-230603A",
"submitter": "Hop gcn.circular",
"authors": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"data": {
"date": "23/06/05 20:50:06 GMT",
"from": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"title": "GCN CIRCULAR",
"number": "33920",
"subject": "Fermi-LAT gamma-ray observations of IceCube-230603A"
},
"message_text": "S. Garrappa (Ruhr-Universitaet Bochum), S. Buson (Univ. of Wuerzburg) and J. Sinapius (DESY-Zeuthen)on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC230603A  high-energy neutrino event (GCN 33911) 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 2023-06-03 at 05:00:47.13 UT (T0) with J2000 position RA =68.20 (+2.62, -3.06) deg, Decl. = +24.21 (+2.08, -2.59) deg (90% PSF containment). Two cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources are located within the 90% IC230603A localization region. These are 4FGL J0439.2+2151, associated with the blazar candidate of uncertain type IERS B0435+217, and the unassociated source 4FGL J0441.8+2600c. 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.\n\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 IC230603A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC230603A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 1.8e-10 ph cm^-2 s^-1 for ~14-years (2008-08-04 to 2023-06-03 UTC), and < 9.7e-9 (< 9.5e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\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 atruhr-uni-bochum.de <http://ruhr-uni-bochum.de/>), J. Sinapius (jonas.sinapius atdesy.de <http://desy.de/>) and S. Buson (sara.buson atuni-wuerzburg.de <http://uni-wuerzburg.de/>).\n\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\n",
"published": "2023-06-05T20:50:14.273514Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-05T20:50:14.273534Z",
"modified": "2023-06-05T20:50:14.280797Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 163,
"topic": "igwn.gwalert",
"uuid": "e85e5069-f0f8-4da1-b61c-aca16d17ca0d",
"title": "S230606d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606d/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230606d/view/"
},
"event": {
"far": 5.5310677553918e-08,
"time": "2023-06-06T00:43:05.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 373.2233928548409,
"area_90": 1379.379105904553,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "21a990c9062a8f0b8a7cd3eff91b0404",
"classification": {
"BBH": 0.9667068842824107,
"BNS": 1.5904633502619938e-27,
"NSBH": 1.262620256758239e-25,
"Terrestrial": 0.033293115717589306
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-06T00:43:30Z",
"superevent_id": "S230606d",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T00:43:31.494484Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T00:43:31.494510Z",
"modified": "2023-06-06T00:43:31.501475Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 164,
"topic": "igwn.gwalert",
"uuid": "23df9e34-4664-49b4-b5d5-f4f7c72e4e1b",
"title": "S230606d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606d/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230606d/view/"
},
"event": {
"far": 1.140316503207786e-08,
"time": "2023-06-06T00:43:05.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 341.7498811594221,
"area_90": 1286.2175112861132,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "b877e8972b7da3357180a5ace4f65922",
"classification": {
"BBH": 0.999277956450759,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.0007220435492409916
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-06T00:48:07Z",
"superevent_id": "S230606d",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T00:48:08.279845Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T00:48:08.279872Z",
"modified": "2023-06-06T00:48:08.285413Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 165,
"topic": "hermes.message",
"uuid": "59f8d2ab-6c2f-4c56-9641-0e967cd3a177",
"title": "INTEGRAL follow-up of S230606d",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230606d at 2023-06-06T00:43:05.000\n\n\nSPI-ACS excesses:\nat T0+43.6 FAP = 0.04\nat T0+161.15 FAP = 0.049\nat T0+-11.85 FAP = 0.071\nat T0+-51.37 FAP = 0.134\nat T0+-29.52 FAP = 0.521\nat T0+115.98 FAP = 0.584\nat T0+-258.77 FAP = 0.665\nat T0+266.83 FAP = 0.712\n\n\n\n\nnext break in data in 39 hr: 2023-06-07T15:18:45, for 9.3 hr",
"published": "2023-06-06T00:55:15.229685Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-06T00:55:15.229703Z",
"modified": "2023-06-06T00:55:15.234832Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 166,
"topic": "igwn.gwalert",
"uuid": "4099a73b-17bc-45a4-8d3a-87b551496a92",
"title": "S230606d - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606d/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230606d/view/"
},
"event": {
"far": 1.140316503207786e-08,
"time": "2023-06-06T00:43:05.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 341.7498811594221,
"area_90": 1286.2175112861132,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "b877e8972b7da3357180a5ace4f65922",
"classification": {
"BBH": 0.999277956450759,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.0007220435492409916
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-06-06T01:01:25Z",
"superevent_id": "S230606d",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T01:01:26.898563Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T01:01:26.898589Z",
"modified": "2023-06-06T01:01:26.903705Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 167,
"topic": "gcn.circular",
"uuid": "59d3fcc6-413c-418b-bede-c8940df2f128",
"title": "GRB 230606A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/06/06 01:15:46 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "33921",
"subject": "GRB 230606A: Swift detection of a burst"
},
"message_text": "\nA. Y. Lien (U Tampa), J.D. Gropp (PSU), J. A. Kennea (PSU),\nD. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII) and\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 00:14:37 the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230606A (trigger\u001173731). Due to communications problems\nfrom a recent typhoon in Guam, only limited real-time data is\navailable and notices are being delayed. Swift had a delayed slew\nto the burst, presumably due to observing constraints.\nThe ground-calculated BAT location based on available data is\nRA, Dec 166.7956 36.5090.\nThere is no immediately-available BAT lightcurve data for\nthis GRB, however the BAT trigger duration was on the 2 second\ntimescale, suggesting a long GRB.\n\nUsing promptly downlinked data we find an uncatalogued X-ray source\nlocated at RA, Dec 166.81107, 36.48427 which is equivalent to:\n RA(J2000) = 11h 07m 14.66s\n Dec(J2000) = +36d 29' 03.4\"\nwith an uncertainty of 3.7 arcseconds (radius, 90% containment). This\nposition may be improved as more data are received; the latest position\nis available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (2.32 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 4\n(+2.97/-2.57) x 10^21 cm^-2 (90% confidence).\n\nFurther information will be available after the complete data\ndownload at the next ground pass.\n\nBurst Advocate for this burst is A. Y. Lien (yarleen AT gmail.com).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n",
"published": "2023-06-06T01:15:55.009272Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T01:15:55.009291Z",
"modified": "2023-06-06T01:15:55.014272Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 168,
"topic": "igwn.gwalert",
"uuid": "dcccd709-1c97-4763-8ef4-e4b378f21854",
"title": "S230606d - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606d/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230606d/view/"
},
"event": {
"far": 1.140316503207786e-08,
"time": "2023-06-06T00:43:05.793Z",
"group": "CBC",
"search": "AllSky",
"area_50": 341.7498811594221,
"area_90": 1286.2175112861132,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "b877e8972b7da3357180a5ace4f65922",
"classification": {
"BBH": 0.999277956450759,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.0007220435492409916
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 4,
"time_created": "2023-06-06T01:43:37Z",
"superevent_id": "S230606d",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T01:43:38.126209Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T01:43:38.126248Z",
"modified": "2023-06-06T01:43:38.132324Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 169,
"topic": "gcn.circular",
"uuid": "14d19708-e424-4992-9d4e-d961c7648ab1",
"title": "LIGO/Virgo/KAGRA S230606d: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "yamazaki.ryo.77@gmail.com",
"data": {
"date": "23/06/06 02:03:29 GMT",
"from": "yamazaki.ryo.77@gmail.com",
"title": "GCN CIRCULAR",
"number": "33922",
"subject": "LIGO/Virgo/KAGRA S230606d: 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 S230606d during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-06 00:43:05.793 UTC (GPS\ntime: 1370047403.793). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230606d is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.1e-08 Hz, or about one in 2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230606d\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<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%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] 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 [7], distributed via GCN notice about 24 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\nThis candidate has had two Initial Alerts sent, with the same content, due to a glitch.\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\n1286 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1818 +/- 557 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] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n",
"published": "2023-06-06T02:03:38.185296Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T02:03:38.185318Z",
"modified": "2023-06-06T02:03:38.191540Z",
"nonlocalizedevents": [
{
"event_id": "S230606d"
}
],
"targets": []
},
{
"id": 170,
"topic": "gcn.circular",
"uuid": "d72ff3c8-8ac2-4118-9aca-326758ca4ffb",
"title": "LIGO/Virgo S230606d: 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": "23/06/06 02:22:22 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33923",
"subject": "LIGO/Virgo S230606d: 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 S230606d errorbox 4075 sec after notice time and 4138 sec after trigger time at 2023-06-06 01:52:03 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 55 deg. The sun altitude is -46.1 deg.\n\nThe galactic latitude b = 31 deg., longitude l = 174 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011944\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 4228 | 2023-06-06 01:52:03 | MASTER-SAAO | (23h 29m 35.30s , -02d 50m 28.6s) | C | 180 | 18.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-06T02:22:31.711748Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T02:22:31.711768Z",
"modified": "2023-06-06T02:22:31.719302Z",
"nonlocalizedevents": [
{
"event_id": "S230606d"
}
],
"targets": []
},
{
"id": 171,
"topic": "gcn.circular",
"uuid": "0877977e-0acd-43ec-8ee0-35363101afe4",
"title": "GRB 230606A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/06/06 06:08:02 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33924",
"subject": "GRB 230606A: Enhanced Swift-XRT position"
},
"message_text": "M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1707 s of XRT Photon Counting mode data and 4 UVOT\nimages for GRB 230606A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 166.80951, +36.48425 which is equivalent\nto:\n\nRA (J2000): 11h 07m 14.28s\nDec (J2000): +36d 29' 03.3\"\n\nwith an uncertainty of 2.2 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n",
"published": "2023-06-06T06:08:11.633431Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T06:08:11.633451Z",
"modified": "2023-06-06T06:08:11.639341Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 172,
"topic": "igwn.gwalert",
"uuid": "9b66d4b9-206f-46ef-951a-6eaeab4e6bb6",
"title": "S230606z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606z/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230606z/view/"
},
"event": {
"far": 4.154582205865146e-07,
"time": "2023-06-06T06:53:20.111Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1348.7448878543455,
"area_90": 5986.681571291254,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f26b7a29ec66106d8bc644bd638f0858",
"classification": {
"BBH": 0.8346274263882714,
"BNS": 1.010269123355217e-35,
"NSBH": 9.061869075001201e-34,
"Terrestrial": 0.16537257361172863
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-06T06:53:49Z",
"superevent_id": "S230606z",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T06:53:49.863922Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T06:53:49.863958Z",
"modified": "2023-06-06T06:53:49.871304Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 173,
"topic": "igwn.gwalert",
"uuid": "22b0b189-064b-4d85-9dfe-ce9cb9175fb1",
"title": "S230606z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230606z/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230606z/view/"
},
"event": {
"far": 4.154582205865146e-07,
"time": "2023-06-06T06:53:20.111Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1348.7448878543455,
"area_90": 5986.681571291254,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f26b7a29ec66106d8bc644bd638f0858",
"classification": {
"BBH": 0.8346274263882714,
"BNS": 1.010269123355217e-35,
"NSBH": 9.061869075001201e-34,
"Terrestrial": 0.16537257361172863
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-06T06:58:23Z",
"superevent_id": "S230606z",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-06T06:58:25.107202Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-06T06:58:25.107229Z",
"modified": "2023-06-06T06:58:25.113561Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 174,
"topic": "hermes.message",
"uuid": "21e4b928-5c68-44a6-8e8c-8217f7a2e460",
"title": "INTEGRAL follow-up of S230606z",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230606z at 2023-06-06T06:53:20.000\n\n\nSPI-ACS excesses:\nat T0+0.15 FAP = 0.013\nat T0+-11.98 FAP = 0.021\nat T0+44.15 FAP = 0.131\nat T0+-106.13 FAP = 0.243\nat T0+164.52 FAP = 0.323\nat T0+-24.63 FAP = 0.469\nat T0+-83.58 FAP = 0.584\nat T0+-33.3 FAP = 0.609\nat T0+102.2 FAP = 0.756\n\n\n\n\nnext break in data in 32 hr: 2023-06-07T15:18:45, for 9.3 hr",
"published": "2023-06-06T07:05:59.793952Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-06T07:05:59.793988Z",
"modified": "2023-06-06T07:05:59.799427Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 175,
"topic": "gcn.circular",
"uuid": "9520e508-840c-4976-b54d-a82fd9b213c4",
"title": "LIGO/Virgo S230606z: 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": "23/06/06 07:06:40 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33925",
"subject": "LIGO/Virgo S230606z: 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 S230606z errorbox 63 sec after trigger time at 2023-06-06 06:54:23 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 68 deg. The sun altitude is -57.6 deg.\n\nThe galactic latitude b = 46 deg., longitude l = 229 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0011954\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 154 | 2023-06-06 06:54:23 | MASTER-OAFA | (16h 14m 22.98s , +20d 47m 18.6s) | C | 180 | 17.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-06T07:06:48.924944Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T07:06:48.924975Z",
"modified": "2023-06-06T07:06:48.930617Z",
"nonlocalizedevents": [
{
"event_id": "S230606z"
}
],
"targets": []
},
{
"id": 176,
"topic": "gcn.circular",
"uuid": "955edb99-e814-4ca6-8b64-d0956e9d8824",
"title": "GRB 230606A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"data": {
"date": "23/06/06 13:18:49 GMT",
"from": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33926",
"subject": "GRB 230606A: Swift/UVOT Upper Limits"
},
"message_text": "A. A. Breeveld (UCL-MSSL) and A. Y. Lien (U. Tampa) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230606A 2784 s after the BAT trigger (Lien et al., GCN Circ. 33921).\nNo optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 33924) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 2784 2934 147 >20.3\nwhite 2784 3554 344 >21.1\nv 3765 3965 197 >19.2\nb 3149 3349 197 >20.2\nu 2943 4514 328 >20.1\nw1 4176 4376 197 >20.2\nw2 3560 3760 197 >20.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.015 in the direction of the burst (Schlegel et al. 1998).\n\n",
"published": "2023-06-06T13:18:59.470695Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T13:18:59.470715Z",
"modified": "2023-06-06T13:18:59.478418Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 177,
"topic": "gcn.circular",
"uuid": "4a7b05f1-8eed-406b-a39e-532d93b5d5c5",
"title": "GRB 230604A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/06/06 14:59:22 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "33927",
"subject": "GRB 230604A: 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 230604A (AstroSat detection: GCN 33915; INTEGRAL/SPI-ACS trigger at 2023-06-04 05:53:48 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-06-04 05:53:48 UTC. The light curve observed by GRBAlpha shows a spike within one 1 s bin where the SNR reaches 6.6 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230604A_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": "2023-06-06T14:59:36.290394Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T14:59:36.290431Z",
"modified": "2023-06-06T14:59:36.297500Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 178,
"topic": "gcn.circular",
"uuid": "0327cdd3-ed97-430e-a595-6fbf82ace0f8",
"title": "GRB 230606A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/06/06 15:33:51 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "33928",
"subject": "GRB 230606A: Swift-XRT refined Analysis"
},
"message_text": "T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini\n(INAF-OAB), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp\n(PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A.\nEvans (U. Leicester) report on behalf of the Swift-XRT team:\n\nWe have analysed 6.8 ks of XRT data for GRB 230606A, from 2.8 ks to\n43.5 ks after the BAT trigger. The data are entirely in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.16 (+0.09, -0.08).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.05 (+0.18, -0.17). The\nbest-fitting absorption column is 1.2 (+0.5, -0.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 2.3 x 10^20 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.3 x 10^-11 (4.2 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.2 (+0.5, -0.4) x 10^21 cm^-2\nGalactic foreground: 2.3 x 10^20 cm^-2\nExcess significance: 3.7 sigma\nPhoton index:\t 2.05 (+0.18, -0.17)\n\nIf the light curve continues to decay with a power-law decay index of\n1.16, the count rate at T+24 hours will be 0.010 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.3 x\n10^-13 (4.3 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/01173731.\n\nThis circular is an official product of the Swift-XRT team.\n\n",
"published": "2023-06-06T15:34:01.635650Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T15:34:01.635679Z",
"modified": "2023-06-06T15:34:01.642914Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 179,
"topic": "gcn.circular",
"uuid": "f2ff527e-3c56-43a0-8f9a-697d450391b6",
"title": "LIGO/Virgo/KAGRA S230602ap: Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Tomas Ahumada at Caltech <tahumada@umd.edu>",
"data": {
"date": "23/06/06 16:26:09 GMT",
"from": "Tomas Ahumada at Caltech <tahumada@umd.edu>",
"title": "GCN CIRCULAR",
"number": "33929",
"subject": "LIGO/Virgo/KAGRA S230602ap: Zwicky Transient Facility observations"
},
"message_text": "Tomas Ahumada (CIT), Gaurav Waratkar (IITB), Viraj Karambelkar (CIT), Robert Stein (CIT), Anirudh Salgundi (IITB), Vishwajeet Swain (IITB), Theophile du Laz (CIT), Igor Andreoni (UMD), Michael Coughlin (UMN), Mansi Kasliwal (CIT), Varun Bhalerao (IITB), Simeon Reusch (DESY), Jannis Necker (DESY), Shreya Anand (CIT), Eric Bellm (UW), S.B. Cenko (UMD), D. Perley (LJMU), D. Kaplan (UWM), K-Ryan Hinds (LJMU) report on behalf of the ZTF and GROWTH collaborations:\n\nWe observed the localization region of LVC trigger S230602ap as part of routine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al., 2019) survey operations. We obtained images in the r, i, and g bands beginning at 2023-06-03T03:58:31.996 (9 hours after the burst trigger time) corresponding to ~7% of the probability enclosed in the localization region.\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. We also run forced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry et al. 2018, Smith et al. 2020) and require no detections before the LVC trigger.\n\nWe do not identify any sources that pass our selection criteria.\n\nFurther follow-up of this localization region will continue as part of regular survey operations.\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). GROWTH India telescope is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). GROWTH-India project is supported by SERB and administered by IUSSTF, under grant number IUSSTF/PIRE Program/GROWTH/2015-16 and IUCAA.\n\n",
"published": "2023-06-06T16:26:18.025574Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T16:26:18.025613Z",
"modified": "2023-06-06T16:26:18.043866Z",
"nonlocalizedevents": [
{
"event_id": "S230602a"
}
],
"targets": []
},
{
"id": 180,
"topic": "gcn.circular",
"uuid": "53950748-03c5-45b6-9c96-8ced9fd375c4",
"title": "GRB 230606A: BOOTES-5/JGT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/06/06 17:14:28 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "33930",
"subject": "GRB 230606A: BOOTES-5/JGT optical upper limit"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar (UMA) and I. M. Carrasco-Garcia (SMA) and I. H. Park (SKKU), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 230606A by Swift (Lien et al. GCNC 33921), we triggered the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) to observe the GRB location starting on Jun. 06, 04:27:09 UT (~ 4.2 hrs after trigger). A series of images in clear filter were gathered. No new optical source is detected within the enhanced Swift/XRT error region (Goad et al. GCNC 33924) down to 20.3 mag, which is consistent with the limits reported by UVOT (Breeveld et al. GCNC 33926).\n\nWe thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.\n\n",
"published": "2023-06-06T17:14:36.773321Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T17:14:36.773341Z",
"modified": "2023-06-06T17:14:36.779980Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 181,
"topic": "gcn.circular",
"uuid": "bc5ff4ec-ff35-4a29-85ab-b234b4362b13",
"title": "GRB 230606A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/06/06 20:43:59 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "33931",
"subject": "GRB 230606A: Fermi GBM Observation"
},
"message_text": "S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 00:14:38.13 UT on 06 June 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230606A (trigger 707703283/230606010).\nwhich was also detected by Swift BAT (A. Y. Lien et al. 2023, GCN 33921).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 110 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 16 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.8 to T0+18.7 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.7 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 148 +/- 22 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.5 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+2.4 s in the 10-1000 keV band is 3.4 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 98 +/- 25 keV, alpha = -0.2 +/- 0.5 and beta = -2.1 +/- 0.2.\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": "2023-06-06T20:44:08.563456Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-06T20:44:08.563473Z",
"modified": "2023-06-06T20:44:08.570489Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 182,
"topic": "gcn.circular",
"uuid": "fbd755a6-5880-40b9-af84-a02e5b30b013",
"title": "GRB 230606A: Gaoyazi/GOT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/06/07 02:16:11 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"title": "GCN CIRCULAR",
"number": "33932",
"subject": "GRB 230606A: Gaoyazi/GOT optical upper limit"
},
"message_text": "S.Y. Fu, T.H. Lu, S.Q. Jiang, X. Liu, Z.P. Zhu, D Xu (NAOC), S.W. Luo, M.M. Yang, Z. K. Feng (GYZO, NAOC) report:\n\nWe observed the field of GRB 230606A detected by Swift (Lien et al., GCN 33921) with the GOT-0.5m telescope located at Gaoyazi, Xinjiang, China. We obtained 20x180 s frames in the Sloan r-band and 15x180 s frames in the Sloan z-band, starting at 16:25:45 UT on 2023-06-06, i.e., 16.18 hr after the Swift/BAT trigger.\n\nNo optical source is detected in our stacked images at the enhanced XRT position (Goad et al., GCN 33924), and preliminary photometric results are as follows:\n\nT_mid-T0 (hr) Filter Upper_Limit (3-sigma)\n 16.74 r >20.9\n 18.05 z >18.1\n\ncalibrated with the nearby PanSTARRS field and not corrected for Galactic extinction.\n\n\n",
"published": "2023-06-07T02:16:20.590964Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T02:16:20.591004Z",
"modified": "2023-06-07T02:16:20.598243Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 183,
"topic": "gcn.circular",
"uuid": "dcae2806-6e16-42ee-bc34-5bdb85692561",
"title": "GRB 230606A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Amy Lien at GSFC <amy.y.lien@nasa.gov>",
"data": {
"date": "23/06/07 17:04:23 GMT",
"from": "Amy Lien at GSFC <amy.y.lien@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "33933",
"subject": "GRB 230606A: Swift-BAT refined analysis"
},
"message_text": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230606A (trigger #1173731)\n(Lien et al., GCN Circ. 33921). The BAT ground-calculated position is\nRA, Dec = 166.777, 36.504 deg which is\n RA(J2000) = 11h 07m 06.4s\n Dec(J2000) = +36d 30' 15.6\"\nwith an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 15%.\n\nThe mask-weighted light curve shows two distinct pulses. The first pulse starts\nat ~T0 and ends at ~T+4 s. The second pulse starts at ~T+14 s and ends at ~T+16 s.\nT90 (15-350 keV) is 16.26 +- 1.29 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.26 to T+16.97 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.15 +- 0.30. The fluence in the 15-150 keV band is 1.2 +- 0.2 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.92 sec in the 15-150 keV band\nis 2.6 +- 0.6 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1173731/BA/\n\n",
"published": "2023-06-07T17:04:38.353912Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T17:04:38.353933Z",
"modified": "2023-06-07T17:04:38.361235Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 184,
"topic": "gcn.circular",
"uuid": "5dc5fb1e-4351-4ae5-862c-5c4e09911ea6",
"title": "ZTF and GIT Observations of the Candidate Optical Afterglow AT2023jxk",
"submitter": "Hop gcn.circular",
"authors": "Anna Y Q Ho at Cornell University <ayh24@cornell.edu>",
"data": {
"date": "23/06/07 18:13:36 GMT",
"from": "Anna Y Q Ho at Cornell University <ayh24@cornell.edu>",
"title": "GCN CIRCULAR",
"number": "33934",
"subject": "ZTF and GIT Observations of the Candidate Optical Afterglow AT2023jxk"
},
"message_text": "Jada Vail, Maggie Li, Anna Ho (Cornell), Harsh Kumar, Vishwajeet Swain (IIT Bombay), Dmitry Svinkin (Ioffe Institute), Daniel Perley (LJMU):\n\nWe report the discovery of a fast-evolving red transient in Zwicky Transient Facility (ZTF) and GROWTH India Telescope (GIT) data.\n\nZTF23aamxeqf (AT2023jxk) was discovered at the position (J2000) of:\n\nRA = 17:02:36.97 (255.6540479 deg)\n\nDec = +51:52:05.09 (51.8680802 deg)\n\non 2023 June 5 by ZTF at g = 19.22 +/- 0.13 mag (MJD`100.20252). ZTF also obtained a detection ~1.6 hours later at r = 18.96 +/- 0.11 mag (MJD`100.26712). Forced photometry on P48 images revealed non-detections prior to discovery at g > 19.91 mag (MJD`099.45061) and r > 20.14 mag (MJD`099.40459), indicating a fast rise rate of >0.9 mag/day in g and >1.5 mag/day in r. Forced photometry also shows two detections later that night at g = 19.84 +/- 0.18 (MJD`100.44324) and r = 19.14 +/- 0.08 (MJD`100.42868), implying that the transient was red.\n\nThe fast rise and fall rates implied by ZTF photometry motivated us to trigger GIT for additional imaging. GIT imaging 1.5 days after the first ZTF detection showed a tentative (3-sigma) detection at r = 22.4 +/- 0.2 mag, indicating an average fading rate of 2.3 mag/day in r-band.\n\nThe Galactic latitude of AT2023jxk is 37.6 degrees, and the Galactic reddening towards the direction of AT2023jxk is: E_(g-r) = 0.032 from Schlafly & Finkbeiner (2011). There is no counterpart within 3 arcseconds in either Legacy Survey DR9 imaging or PS1 imaging.\n\nThe fast rise, fast decay, red color, and lack of archival optical counterpart of AT2023jxk make it a strong candidate afterglow. However, we did not identify any GRBs coincident with this position during the time window between the last non-detection and the first detection: Konus-Wind was observing the whole sky during the entire interval of interest (except ~1 hour between 05:58:03 - 06:58:16 on June 4) and did not detect any counterpart.\n\nAdditional observations, including photometry and spectroscopy, are encouraged to determine the nature of this transient.\n\n\nZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.\n\nThe 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 the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n",
"published": "2023-06-07T18:13:46.368827Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T18:13:46.368845Z",
"modified": "2023-06-07T18:13:46.379388Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 185,
"topic": "gcn.circular",
"uuid": "6a0b5dda-8dc7-4905-9869-deb18bae1b2a",
"title": "GRB 230506B: Chandra localization of the X-ray afterglow",
"submitter": "Hop gcn.circular",
"authors": "Brendan O'Connor at UMD <oconnorb@umd.edu>",
"data": {
"date": "23/06/07 19:35:15 GMT",
"from": "Brendan O'Connor at UMD <oconnorb@umd.edu>",
"title": "GCN CIRCULAR",
"number": "33935",
"subject": "GRB 230506B: Chandra localization of the X-ray afterglow"
},
"message_text": "B. O'Connor (GWU), S. Dichiara (PSU), E. Troja (UTV), S. B. Cenko (NASA-GSFC, UMD), C. Kouveliotou (GWU), T. Sakamoto (AGU), A. Kutyrev (UMD), G. Ryan (Perimeter), R. Ricci (INAF), G. Bruni (INAF):\n\nWe carried out two Chandra ToO observation of GRB 230506B beginning on May 11, 2023 at 06:59:55 UT and June 01, 2023 at 19:31:19 UT with ACIS-S as part of program 24400201 (PI: O'Connor) for a total of 19 ks and 55 ks, respectively. The initial observation began ~4.8 days after the GRB trigger (Dichiara et al. GCN 33727).\n\nWithin the XRT localization (Burrows et al. GCN 33737), we detect a single point source at RA, DEC = 21:47:55.6, 44:30:41.6 with an uncertainty of 0.9\" (90% confidence, statistical + systematic). The source displays rapid fading between the two Chandra epochs confirming that it is the X-ray afterglow of GRB 230506B.\n\nWe would like to thank Patrick Slane, Harvey Tananbaum, Dan Schwartz, Scott Wolk,\nand the CXO staff for rapidly approving and planning this observation.\n\n",
"published": "2023-06-07T19:35:23.684723Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T19:35:23.684740Z",
"modified": "2023-06-07T19:35:23.699440Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 186,
"topic": "gcn.circular",
"uuid": "968d24e5-a599-484a-8aab-cf5b5c27c94c",
"title": "Fermi trigger No 707039690: 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": "23/06/07 21:03:49 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33936",
"subject": "Fermi trigger No 707039690: 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 GRB230529.33 (trigger No 707039690,23h 07m 21.60s , -50d 00m 00.0s, R\u0012.67) errorbox 1 days 79079 sec after notice time and 1 days 79120 sec after trigger time at 2023-05-31 05:53:25 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 47 deg. The sun altitude is -69.7 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230529.33 errorbox 7 days 71418 sec after notice time and 7 days 71458 sec after trigger time at 2023-06-06 03:45:44 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 26 deg. The sun altitude is -22.2 deg.\n\nThe galactic latitude b = -60 deg., longitude l = 337 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"19660\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 165610 | 2023-05-31 05:53:25 | MASTER-OAFA | (21h 47m 17.84s , -50d 05m 55.5s) | C | 180 | 17.4 |\n 167446 | 2023-05-31 06:24:01 | MASTER-OAFA | (21h 47m 18.52s , -50d 07m 46.4s) | C | 180 | 18.8 |\n 168503 | 2023-05-31 06:41:38 | MASTER-OAFA | (21h 47m 18.17s , -50d 07m 42.1s) | C | 180 | 18.8 |\n 676349 | 2023-06-06 03:45:44 | MASTER-SAAO | (22h 52m 52.49s , -55d 59m 54.9s) | C | 180 | 19.0 |\n 676349 | 2023-06-06 03:45:44 | MASTER-SAAO | (22h 51m 04.42s , -56d 00m 22.1s) | C | 180 | 18.3 |\n 676650 | 2023-06-06 03:50:45 | MASTER-SAAO | (23h 07m 12.47s , -56d 00m 40.4s) | C | 180 | 19.3 |\n 676651 | 2023-06-06 03:50:45 | MASTER-SAAO | (23h 05m 38.47s , -55d 58m 59.7s) | C | 180 | 19.3 |\n 677395 | 2023-06-06 04:03:09 | MASTER-SAAO | (22h 52m 47.38s , -56d 01m 37.7s) | C | 180 | 19.2 |\n 677395 | 2023-06-06 04:03:09 | MASTER-SAAO | (22h 50m 59.24s , -56d 02m 07.4s) | C | 180 | 19.2 |\n 677697 | 2023-06-06 04:08:12 | MASTER-SAAO | (23h 07m 07.58s , -56d 00m 15.2s) | C | 180 | 19.4 |\n 677697 | 2023-06-06 04:08:12 | MASTER-SAAO | (23h 05m 34.25s , -55d 58m 30.3s) | C | 180 | 19.4 |\n 678000 | 2023-06-06 04:13:15 | MASTER-SAAO | (23h 07m 16.53s , -57d 54m 49.2s) | C | 180 | 18.9 |\n 678000 | 2023-06-06 04:13:15 | MASTER-SAAO | (23h 05m 38.70s , -57d 53m 04.1s) | C | 180 | 18.9 |\n 678211 | 2023-06-06 04:16:46 | MASTER-SAAO | (23h 22m 20.90s , -57d 54m 08.9s) | C | 180 | 19.1 |\n 678211 | 2023-06-06 04:16:46 | MASTER-SAAO | (23h 20m 43.06s , -57d 52m 23.5s) | C | 180 | 19.0 |\n 678422 | 2023-06-06 04:20:17 | MASTER-SAAO | (22h 37m 04.26s , -57d 53m 06.2s) | C | 180 | 18.9 |\n 678422 | 2023-06-06 04:20:17 | MASTER-SAAO | (22h 38m 42.35s , -57d 54m 52.4s) | C | 180 | 18.9 |\n 678857 | 2023-06-06 04:27:31 | MASTER-SAAO | (22h 50m 10.98s , -57d 53m 18.8s) | C | 180 | 18.5 |\n 678857 | 2023-06-06 04:27:31 | MASTER-SAAO | (22h 51m 48.83s , -57d 55m 05.8s) | C | 180 | 18.6 |\n 679068 | 2023-06-06 04:31:03 | MASTER-SAAO | (23h 05m 44.12s , -57d 51m 48.3s) | C | 180 | 18.5 |\n 679068 | 2023-06-06 04:31:03 | MASTER-SAAO | (23h 07m 22.43s , -57d 53m 34.4s) | C | 180 | 18.6 |\n 679505 | 2023-06-06 04:38:20 | MASTER-SAAO | (23h 20m 39.49s , -57d 52m 00.5s) | C | 180 | 17.9 |\n 679505 | 2023-06-06 04:38:20 | MASTER-SAAO | (23h 22m 17.79s , -57d 53m 44.9s) | C | 180 | 17.9 |\n 679717 | 2023-06-06 04:41:51 | MASTER-SAAO | (22h 35m 13.82s , -57d 51m 35.0s) | C | 180 | 17.1 |\n 679717 | 2023-06-06 04:41:51 | MASTER-SAAO | (22h 36m 52.11s , -57d 53m 23.3s) | 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",
"published": "2023-06-07T21:03:58.074169Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T21:03:58.074187Z",
"modified": "2023-06-07T21:03:58.081713Z",
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{
"id": 187,
"topic": "gcn.circular",
"uuid": "680e5c03-b7f4-4eda-9166-65ec044e8424",
"title": "Fermi GRB 230603A: 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": "23/06/07 21:03:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "33937",
"subject": "Fermi GRB 230603A: 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 230603A ( Fermi GBM team, GCN 33910) errorbox 1 days 62021 sec after notice time and 1 days 62028 sec after trigger time at 2023-06-05 05:49:18 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 28 deg. The sun altitude is -71.0 deg.\n\nThe galactic latitude b = -16 deg., longitude l = 28 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"20782\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 148519 | 2023-06-05 05:49:18 | MASTER-OAFA | (19h 36m 44.32s , -12d 09m 24.2s) | C | 180 | 16.9 |\n 148699 | 2023-06-05 05:49:18 | MASTER-OAFA | (19h 36m 44.32s , -12d 09m 24.2s) | C | 540 | 17.4 | Coadd\n 148730 | 2023-06-05 05:52:49 | MASTER-OAFA | (19h 36m 49.42s , -12d 10m 24.5s) | C | 180 | 16.9 |\n 148942 | 2023-06-05 05:56:21 | MASTER-OAFA | (19h 36m 42.96s , -12d 11m 25.1s) | C | 180 | 16.8 |\n 149797 | 2023-06-05 06:10:36 | MASTER-OAFA | (19h 36m 48.72s , -12d 09m 29.5s) | C | 180 | 15.5 |\n 150804 | 2023-06-05 06:27:23 | MASTER-OAFA | (19h 36m 50.02s , -12d 11m 07.1s) | C | 180 | 16.7 |\n 154240 | 2023-06-05 07:24:39 | MASTER-OAFA | (19h 29m 31.33s , -14d 34m 07.0s) | C | 180 | 16.9 |\n 155299 | 2023-06-05 07:42:18 | MASTER-OAFA | (19h 29m 23.79s , -14d 32m 35.0s) | C | 180 | 17.2 |\n 155934 | 2023-06-05 07:52:53 | MASTER-OAFA | (19h 37m 42.65s , -14d 33m 21.1s) | C | 180 | 16.9 |\n 165891 | 2023-06-05 10:38:50 | MASTER-OAFA | (19h 21m 33.74s , -13d 31m 44.8s) | C | 180 | 16.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n",
"published": "2023-06-07T21:04:00.102074Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-07T21:04:00.102101Z",
"modified": "2023-06-07T21:04:00.202823Z",
"nonlocalizedevents": [],
"targets": []
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"topic": "igwn.gwalert",
"uuid": "a783eb90-2b83-401d-b003-6367c553691f",
"title": "S230608q - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 1,
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"retracted": false,
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"id": 189,
"topic": "igwn.gwalert",
"uuid": "f6d9b1ef-1d5e-4e71-9681-ce14a9ae4c0c",
"title": "S230608q - PRELIMINARY",
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"authors": "LVK",
"data": {
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},
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"published": "2023-06-08T09:27:14.426792Z",
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"retracted": false,
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{
"id": 190,
"topic": "hermes.message",
"uuid": "7fe34e3c-bd12-4722-890b-d52ba11380cf",
"title": "INTEGRAL follow-up of S230608q",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230608q at 2023-06-08T09:22:05.000\n\n\nSPI-ACS excesses:\nat T0+-8.89 FAP = 0.137\nat T0+34.91 FAP = 0.254\nat T0+-47.26 FAP = 0.413\n\n\n\n\nnext break in data in 45 hr: 2023-06-10T06:03:50, for 10 hr",
"published": "2023-06-08T09:35:18.019137Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-08T09:35:18.019155Z",
"modified": "2023-06-08T09:35:18.025597Z",
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"targets": []
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{
"id": 191,
"topic": "igwn.gwalert",
"uuid": "72c20da5-71d3-4fb6-8a1c-1f62b1645f39",
"title": "S230608aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"area_90": 1706.7036275369078,
"duration": null,
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"time_created": "2023-06-08T18:05:07Z",
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"published": "2023-06-08T18:05:08.475049Z",
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"retracted": false,
"created": "2023-06-08T18:05:08.475070Z",
"modified": "2023-06-08T18:05:08.482264Z",
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{
"id": 192,
"topic": "igwn.gwalert",
"uuid": "87f1be01-7d68-42ec-a9e2-aadee41a69a9",
"title": "S230608aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-06-08T18:09:44Z",
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},
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"published": "2023-06-08T18:09:45.050720Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-08T18:09:45.050742Z",
"modified": "2023-06-08T18:09:45.070978Z",
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},
{
"id": 193,
"topic": "hermes.message",
"uuid": "967ddc5b-70ba-4f5a-a3b0-4f7bd9d8ee9e",
"title": "INTEGRAL follow-up of S230608aa",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230608aa at 2023-06-08T18:04:38.000\n\n\nSPI-ACS excesses:\nat T0+-17.77 FAP = 0.01\nat T0+-1.82 FAP = 0.02\nat T0+206.75 FAP = 0.331\nat T0+246.0 FAP = 0.377\nat T0+-104.15 FAP = 0.613\nat T0+20.7 FAP = 0.665\nat T0+-28.1 FAP = 0.739\nat T0+112.65 FAP = 0.919\n\n\n\n\nnext break in data in 36 hr: 2023-06-10T06:03:50, for 10 hr",
"published": "2023-06-08T18:16:52.122196Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-08T18:16:52.122214Z",
"modified": "2023-06-08T18:16:52.128882Z",
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"targets": []
},
{
"id": 194,
"topic": "igwn.gwalert",
"uuid": "7724afdf-9056-467e-a697-abc43cbfe657",
"title": "S230608ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-06-08T19:06:55.376259Z",
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"retracted": false,
"created": "2023-06-08T19:06:55.376285Z",
"modified": "2023-06-08T19:06:55.384838Z",
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{
"id": 195,
"topic": "igwn.gwalert",
"uuid": "9bcdf2c6-4ccc-4589-b500-3e723caf65e4",
"title": "S230608ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 196,
"topic": "hermes.message",
"uuid": "d0c3f54d-f6f0-477e-83c5-a970e9a8a983",
"title": "INTEGRAL follow-up of S230608ah",
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"data": {},
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"published": "2023-06-08T19:19:15.884872Z",
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"retracted": false,
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},
{
"id": 197,
"topic": "igwn.gwalert",
"uuid": "3368eae6-5773-4b53-8f8e-f01c58d03cc7",
"title": "S230608as - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"time_created": "2023-06-08T20:51:12Z",
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},
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"retracted": false,
"created": "2023-06-08T20:51:13.007502Z",
"modified": "2023-06-08T20:51:13.013700Z",
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},
{
"id": 198,
"topic": "hermes.message",
"uuid": "3f2da18e-1340-4806-8ec9-18a20bc550e0",
"title": "INTEGRAL follow-up of S230608as",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230608as at 2023-06-08T20:50:47.000\n\n\nSPI-ACS excesses:\nat T0+-230.62 FAP = 0.118\nat T0+87.51 FAP = 0.204\nat T0+125.41 FAP = 0.236\nat T0+-275.14 FAP = 0.329\nat T0+35.01 FAP = 0.337\nat T0+-13.77 FAP = 0.885\n\n\n\n\nnext break in data in 33 hr: 2023-06-10T06:03:50, for 10 hr",
"published": "2023-06-08T21:03:49.503331Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-06-08T21:03:49.503349Z",
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},
{
"id": 199,
"topic": "igwn.gwalert",
"uuid": "130df3d1-43de-4c59-8725-b72379f69269",
"title": "S230608as - INITIAL",
"submitter": "cody.messick-30d512c8",
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"event": {
"far": 1.369213707937339e-10,
"time": "2023-06-08T20:50:47.157Z",
"group": "CBC",
"search": "AllSky",
"area_50": 468.0111189108769,
"area_90": 2216.574517002692,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "319e0f57de74007d7187d5822fa629be",
"classification": {
"BBH": 0.9998056109287473,
"BNS": 2.6521932956095014e-24,
"NSBH": 5.421817374918003e-19,
"Terrestrial": 0.00019438907125268745
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 2,
"time_created": "2023-06-08T21:32:28Z",
"superevent_id": "S230608as",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-08T21:32:28.944894Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-08T21:32:28.944923Z",
"modified": "2023-06-08T21:32:28.951965Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 200,
"topic": "gcn.circular",
"uuid": "6fda7440-1b2f-4dcd-b4ef-ccdbd2ffc396",
"title": "LIGO/Virgo/KAGRA S230608as: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Jessica Irwin at University of Glasgow <jessica.irwin@ligo.org>",
"data": {
"date": "23/06/08 21:39:20 GMT",
"from": "Jessica Irwin at University of Glasgow <jessica.irwin@ligo.org>",
"title": "GCN CIRCULAR",
"number": "33938",
"subject": "LIGO/Virgo/KAGRA S230608as: 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 S230608as during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-08 20:50:47.161 UTC (GPS\ntime: 1370292665.161). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], and SPIIR [4] analysis pipelines.\n\nS230608as is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.4e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230608as\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\n(<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,1, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 24 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [6], distributed via GCN notice about 41 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n2217 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3193 +/- 956 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] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\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": "2023-06-08T21:39:34.648344Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-08T21:39:34.648368Z",
"modified": "2023-06-08T21:39:34.654672Z",
"nonlocalizedevents": [
{
"event_id": "S230608a"
}
],
"targets": []
}
]
}
