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"results": [
{
"id": 5686,
"topic": "gcn.circular",
"uuid": "01fc1212-674f-4fcb-8bf0-51fc4726d7c7",
"title": "GRB 240101C: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/04 04:38:33 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35478"
},
"title": "GCN CIRCULAR",
"number": "35478",
"subject": "GRB 240101C: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a short-duration GRB 240101C which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35451), and GRBAlpha (Dafcikova et al., GCN Circ. 35459).\n\nThe source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-01 12:57:23.80 UTC. The measured peak count rate associated with the burst is 881 (+732, -43) counts/s above the background in the combined data of all quadrants, with a total of 69 (+31, -22) counts. The local mean background count rate was 331 (+13, -43) counts/s. Using cumulative rates, we measure a T90 of 0.13 (+0.06, -0.04) s.\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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35478.",
"published": "2024-01-04T04:38:43.916403Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-04T04:38:43.916419Z",
"modified": "2024-01-04T04:38:43.922954Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5687,
"topic": "gcn.circular",
"uuid": "6e5525ff-9660-47fc-b094-287a3d34628f",
"title": "GRB 240102C: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/04 04:55:12 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35479"
},
"title": "GCN CIRCULAR",
"number": "35479",
"subject": "GRB 240102C: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240102C which was also detected by Fermi (Trigger Num. 725857207), and Konus-IPN.\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-02 03:00:04.50 UTC. The measured peak count rate associated with the burst is 170 (+35, -32) counts/s above the background in the combined data of all quadrants, with a total of 1021 (+191, -224) counts. The local mean background count rate was 336 (+2, -4) counts/s. Using cumulative rates, we measure a T90 of 10 (+4, -3) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-02 03:00:02.75 UTC. The measured peak count rate associated with the burst is 285 (+52, -45) counts/s above the background in the combined data of two quadrants (out of four), with a total of 2066 (+305, -324) counts. The local mean background count rate was 757 (+3, -4) counts/s. We measure a T90 of 19 (+2, -8) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35479.",
"published": "2024-01-04T04:55:22.603891Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-04T04:55:22.603905Z",
"modified": "2024-01-04T04:55:22.610302Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5699,
"topic": "gcn.circular",
"uuid": "de0e735b-9e78-463b-aac2-c0b8032485bc",
"title": "LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Dana Jones at Australian National University <dana.jones@anu.edu.au>",
"data": {
"date": "24/01/04 17:32:19 GMT",
"from": "Dana Jones at Australian National University <dana.jones@anu.edu.au>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35480"
},
"title": "GCN CIRCULAR",
"number": "35480",
"subject": "LIGO/Virgo/KAGRA S240104bl: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S240104bl during real-time processing of data from LIGO Hanford Observatory (H1) at 2024-01-04 16:49:32.629 UTC (GPS time: 1388422190.629). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS240104bl is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.6e-17 Hz, or about one in 1e9 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S240104bl\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 23 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24219 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1777 +/- 565 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35480.",
"published": "2024-01-04T17:32:35.359300Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-04T17:32:35.359315Z",
"modified": "2024-01-04T17:32:35.365453Z",
"nonlocalizedevents": [
{
"event_id": "S240104b"
}
],
"targets": []
},
{
"id": 5713,
"topic": "gcn.circular",
"uuid": "0d6bad35-f8d7-4802-a568-226f02ced7c6",
"title": "GRB 240106A: 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": "24/01/06 00:44:36 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35490"
},
"title": "GCN CIRCULAR",
"number": "35490",
"subject": "GRB 240106A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 00:34:08 UT on 6 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240106A (trigger 726194053.403458 / 240106024).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 8.0, Dec = 53.7 (J2000 degrees, equivalent to J2000 00h 32m, 53d 42'), with a statistical uncertainty of 1.7 degrees.\n\nThe angle from the Fermi LAT boresight is 17.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106024/quicklook/glg_skymap_all_bn240106024.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/2024/bn240106024/quicklook/glg_healpix_all_bn240106024.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106024/quicklook/glg_lc_medres34_bn240106024.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35490.",
"published": "2024-01-06T00:44:46.950651Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-06T00:44:46.950669Z",
"modified": "2024-01-06T00:44:46.957959Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5714,
"topic": "gcn.circular",
"uuid": "e1de494a-e42a-482e-ad81-0c5fbf008d36",
"title": "Fermi trigger No 726194053: 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": "24/01/06 02:01:28 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35491"
},
"title": "GCN CIRCULAR",
"number": "35491",
"subject": "Fermi trigger No 726194053: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240106.02 (trigger No 726194053,00h 31m 50.40s , +53d 41m 24.0s, R=1.7) errorbox 298 sec after notice time and 333 sec after trigger time at 2024-01-06 00:39:42 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 77 deg. The sun altitude is -48.9 deg.\n\nThe galactic latitude b = -9 deg., longitude l = 120 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#49923\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 364 | 2024-01-06 00:39:42 | MASTER-Tavrida | (00h 22m 45.56s , +54d 02m 47.2s) | C | 60 | 17.4 |\n 437 | 2024-01-06 00:40:55 | MASTER-Tavrida | (00h 21m 47.46s , +52d 10m 31.3s) | C | 60 | 16.8 |\n 698 | 2024-01-06 00:44:41 | MASTER-Tavrida | (00h 35m 19.34s , +53d 21m 05.2s) | C | 130 | 17.3 |\n 847 | 2024-01-06 00:47:00 | MASTER-Tavrida | (00h 35m 13.00s , +53d 20m 04.0s) | C | 150 | 17.2 |\n 1019 | 2024-01-06 00:49:37 | MASTER-Tavrida | (00h 35m 19.93s , +53d 20m 32.1s) | C | 180 | 17.3 |\n 1206 | 2024-01-06 00:52:44 | MASTER-Tavrida | (00h 35m 17.29s , +53d 21m 50.2s) | C | 180 | 17.3 |\n 1394 | 2024-01-06 00:55:52 | MASTER-Tavrida | (00h 35m 17.59s , +53d 20m 36.2s) | C | 180 | 17.6 |\n 1584 | 2024-01-06 00:59:02 | MASTER-Tavrida | (00h 35m 20.34s , +53d 21m 53.8s) | C | 180 | 17.5 |\n 1772 | 2024-01-06 01:02:10 | MASTER-Tavrida | (00h 35m 15.74s , +53d 21m 08.8s) | C | 180 | 17.5 |\n 2311 | 2024-01-06 01:12:09 | MASTER-Tavrida | (00h 22m 49.01s , +54d 03m 07.4s) | C | 60 | 17.3 |\n 2384 | 2024-01-06 01:13:22 | MASTER-Tavrida | (00h 36m 35.55s , +54d 03m 03.5s) | C | 60 | 17.6 |\n 2458 | 2024-01-06 01:14:36 | MASTER-Tavrida | (00h 34m 56.27s , +52d 09m 12.9s) | C | 60 | 17.2 |\n 2647 | 2024-01-06 01:17:45 | MASTER-Tavrida | (00h 10m 38.78s , +54d 04m 08.3s) | C | 60 | 16.6 |\n 2720 | 2024-01-06 01:18:58 | MASTER-Tavrida | (00h 24m 04.41s , +55d 57m 23.5s) | C | 60 | 17.6 |\n 2794 | 2024-01-06 01:20:12 | MASTER-Tavrida | (00h 46m 43.07s , +52d 09m 20.4s) | C | 60 | 17.2 |\n 2867 | 2024-01-06 01:21:25 | MASTER-Tavrida | (00h 48m 48.78s , +54d 03m 51.4s) | C | 60 | 17.3 |\n 2941 | 2024-01-06 01:22:39 | MASTER-Tavrida | (00h 51m 20.26s , +55d 57m 53.4s) | C | 60 | 17.3 |\n 3433 | 2024-01-06 01:30:51 | MASTER-Tavrida | (00h 14m 46.66s , +54d 15m 32.6s) | C | 60 | 16.9 |\n 3528 | 2024-01-06 01:32:26 | MASTER-Tavrida | (00h 36m 32.94s , +54d 05m 08.5s) | C | 60 | 17.0 |\n 3719 | 2024-01-06 01:35:37 | MASTER-Tavrida | (00h 10m 39.74s , +54d 05m 11.1s) | C | 60 | 15.9 |\n 3813 | 2024-01-06 01:37:11 | MASTER-Tavrida | (00h 15m 33.17s , +56d 09m 39.2s) | C | 60 | 17.0 |\n 3908 | 2024-01-06 01:38:46 | MASTER-Tavrida | (00h 38m 21.89s , +55d 59m 12.0s) | C | 60 | 16.8 |\n 4055 | 2024-01-06 01:41:13 | MASTER-Tavrida | (00h 48m 57.28s , +54d 03m 05.1s) | C | 60 | 16.0 |\n 4200 | 2024-01-06 01:43:38 | MASTER-Tavrida | (00h 51m 19.32s , +55d 57m 29.1s) | C | 60 | 16.4 |\n 4741 | 2024-01-06 01:52:38 | MASTER-Tavrida | (00h 28m 36.53s , +54d 15m 15.2s) | C | 60 | 17.0 |\n 4838 | 2024-01-06 01:54:15 | MASTER-Tavrida | (00h 24m 02.59s , +55d 58m 31.1s) | C | 60 | 16.2 |\n 4933 | 2024-01-06 01:55:50 | MASTER-Tavrida | (00h 29m 55.78s , +56d 10m 45.8s) | C | 60 | 16.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35491.",
"published": "2024-01-06T02:01:38.912628Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-06T02:01:38.912641Z",
"modified": "2024-01-06T02:01:38.921323Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5701,
"topic": "gcn.circular",
"uuid": "38ca6269-eb03-4db5-9af2-4cc411e99ce6",
"title": "LIGO/Virgo/KAGRA S240104bl: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"data": {
"date": "24/01/05 01:00:31 GMT",
"from": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35481"
},
"title": "GCN CIRCULAR",
"number": "35481",
"subject": "LIGO/Virgo/KAGRA S240104bl: 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) data around the time of the compact binary merger (CBC) candidate S240104bl (GCN Circular 35480). 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/S240104bl\n\nAfter parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 27949 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1978 +/- 618 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n[1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023)\n[2] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35481.",
"published": "2024-01-05T01:00:44.696604Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T01:00:44.696621Z",
"modified": "2024-01-05T01:00:44.701786Z",
"nonlocalizedevents": [
{
"event_id": "S240104b"
}
],
"targets": []
},
{
"id": 5702,
"topic": "gcn.circular",
"uuid": "204f729e-e76a-402e-b8f4-0357b8ce3d07",
"title": "GRB 240101C: Swift/BAT-GUANO detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/01/05 02:17:35 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35482"
},
"title": "GCN CIRCULAR",
"number": "35482",
"subject": "GRB 240101C: Swift/BAT-GUANO detection of a short burst"
},
"message_text": "James DeLaunay (PSU), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240101C onboard (T0: 2024-01-01T12:57:23.76 UTC, Fermi GBM Trig 725806648, GRBAlpha GCN 35459, AstroSat CZTI GCN 35478).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 11.2 in a 0.128 s analysis time bin, starting at T0 s.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 4.2.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35482.",
"published": "2024-01-05T02:17:46.031650Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T02:17:46.031667Z",
"modified": "2024-01-05T02:17:46.037586Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5703,
"topic": "gcn.circular",
"uuid": "81880356-ffa4-4196-a7ed-20c4222f6b23",
"title": "GRB 240101B: 1.3m DFOT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"data": {
"date": "24/01/05 11:17:13 GMT",
"from": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35483"
},
"title": "GCN CIRCULAR",
"number": "35483",
"subject": "GRB 240101B: 1.3m DFOT optical upper limit"
},
"message_text": "Amit K. Ror, Rahul Gupta, Amar Aryan, and Shashi B. Pandey (ARIES) report:\nWe observed the field of the GRB 240101B detected by Swift (Cenko et al.\n2024, GCN 35449) with the 1.3m Devasthal Fast Optical Telescope (DFOT),\nlocated at the Devasthal Observatory of the Aryabhatta Research Institute\nof Observational Sciences (ARIES), India. The observations were started on\n2024-01-02 at 12:43:55 UT, i.e., ~ 0.68 days after the BAT trigger. We have\ntaken multiple frames with an exposure time of 300 s in the R filter. We\nstacked the images after the alignment. We did not detect any optical\nafterglow in our stacked image within the enhanced Swift-XRT error box\n(Evans et al., 2024, GCN 35455). We obtain the following preliminary\n3-sigma upper limit in the stacked image:\n\nDate Start_UT T_start-T0 (days) Filter Exp time (s) Limiting magnitude\n========================================================2024-01-02 12:43:55 ~0.68 R 300*12 > 21.7\n\n\nOur non-detection is consistent with Zheng et al. 2024, GCN 35454; Kuin et\nal. 2024, GCN 35458; and Peretto 2024, GCN 35463.\n\nThe magnitude is not corrected for the Galactic extinction in the direction\nof the burst. Photometric calibration is performed using the standard stars\nfrom the USNO-B1.0 catalog. This circular may be cited.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35483.",
"published": "2024-01-05T11:17:27.404709Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T11:17:27.404724Z",
"modified": "2024-01-05T11:17:27.411536Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5837,
"topic": "gcn.circular",
"uuid": "b201b07f-2e8c-44f4-9efd-5f3fc512d89d",
"title": "LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "24/01/17 03:20:27 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35550"
},
"title": "GCN CIRCULAR",
"number": "35550",
"subject": "LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO"
},
"message_text": "\nSamuele Ronchini (PSU), James DeLaunay (PSU), Jamie A. Kennea (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 67.5% of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 22.4% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 12.2 8.63 7.82 9.44\n1.024 6.23 4.39 3.98 4.80\n4.096 3.32 2.34 2.12 2.56\n16.38 2.02 1.43 1.29 1.56\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.10515875\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.10515879\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35550.",
"published": "2024-01-17T03:20:38.746729Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T03:20:38.746749Z",
"modified": "2024-01-17T03:20:38.756507Z",
"nonlocalizedevents": [
{
"event_id": "S240109a"
}
],
"targets": []
},
{
"id": 5704,
"topic": "gcn.circular",
"uuid": "56cdf91d-a103-483e-a7e1-f3589031a9d8",
"title": "GRB 240102A: 1.3m DFOT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"data": {
"date": "24/01/05 11:20:00 GMT",
"from": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35484"
},
"title": "GCN CIRCULAR",
"number": "35484",
"subject": "GRB 240102A: 1.3m DFOT optical upper limit"
},
"message_text": "Amit K. Ror, Rahul Gupta, Amar Aryan, and Shashi B. Pandey (ARIES) report:\n\nWe observed the field of GRB 240102A detected by Swift (Gropp et al. 2024,\nGCN 35461) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located\nat the Devasthal Observatory of the Aryabhatta Research Institute of\nObservational Sciences (ARIES), India. The observations were started on\n2024-01-02 at 18:23:56 UT, i.e., ~ 49 minutes after the BAT trigger. We\nhave taken multiple frames with an exposure time of 300 s in the R filter.\nWe stacked the images after the alignment. We did not detect any optical\nafterglow in our stacked image within the enhanced Swift-XRT error box\n(Goad et al., 2024, GCN 35471). We obtain the following preliminary 3-sigma\nupper limit in the stacked image:\n\n\nDate Start_UT T_start-T0 (minutes) Filter Exp time (s) Limiting magnitude\n========================================================2024-01-02 18:23:56 ~49 R 300*20 > 21.5\n\n\nOur non-detection is consistent with the observations of Hu et al. 2024,\nGCN 35465; Strausbaugh et al. 2024, GCN 35467; and Belles et al. 2024, GCN\n35475.\n\nThe magnitude is not corrected for the Galactic extinction in the direction\nof the burst. Photometric calibration is performed using the standard stars\nfrom the USNO-B1.0 catalog. This circular may be cited.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35484.",
"published": "2024-01-05T11:20:08.690003Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T11:20:08.690024Z",
"modified": "2024-01-05T11:20:08.701652Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5722,
"topic": "gcn.circular",
"uuid": "cb8c5202-d297-4762-a6c7-4c4f06422499",
"title": "Fermi trigger No 726347794: 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": "24/01/07 23:01:54 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35494"
},
"title": "GCN CIRCULAR",
"number": "35494",
"subject": "Fermi trigger No 726347794: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB240107.80 (trigger No 726347794,19h 59m 04.08s , -69d 03m 00.0s, R'.77) errorbox 12352 sec after notice time and 12393 sec after trigger time at 2024-01-07 22:43:03 UT, with upper limit up to 12.1 mag. The observations began at zenith distance = 55 deg. The sun altitude is -35.6 deg.\n\nThe galactic latitude b = -32 deg., longitude l = 327 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#51028\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 12423 | 2024-01-07 22:43:03 | MASTER-SAAO | (10h 28m 20.46s , -85d 56m 22.5s) | C | 60 | 12.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35494.",
"published": "2024-01-07T23:02:10.782912Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-07T23:02:10.782929Z",
"modified": "2024-01-07T23:02:10.792431Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5707,
"topic": "gcn.circular",
"uuid": "67b91c37-ccbb-4004-80ac-d735554a8f8f",
"title": "IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event",
"submitter": "Hop gcn.circular",
"authors": "Erik Blaufuss at University of Maryland, College Park <blaufuss@umd.edu>",
"data": {
"date": "24/01/05 15:22:16 GMT",
"from": "Erik Blaufuss at University of Maryland, College Park <blaufuss@umd.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35485"
},
"title": "GCN CIRCULAR",
"number": "35485",
"subject": "IceCube-240105A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2024-01-05 at 12:27:42.57 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity\nfor Bronze alerts is 30%. This alert has an estimated false alarm rate of 2.64 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.\n\nAfter the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/138821_46175426.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2024-01-05\nTime: 12:27:42.57 UT\nRA: 72.69 (+0.53, -0.33 deg 90% PSF containment) J2000\nDec: +11.42 (+0.20, -0.08 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nOne gamma-ray source listed in the 4FGL-DR4 Fermi-LAT catalog is located in the 90% uncertainty of the event. The source is 4FGL J0449.1+112 (associated with PKS 0446+11), located at RA = 72.28 deg and Dec = +11.36 deg (J2000), 0.4 deg away from the best-fit position.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35485.",
"published": "2024-01-05T15:22:32.889197Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T15:22:32.889213Z",
"modified": "2024-01-05T15:22:32.897790Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5709,
"topic": "gcn.circular",
"uuid": "59742dcd-d731-4aad-a738-636bdc051361",
"title": "GRB 240101A: 1.3m DFOT optical observations",
"submitter": "Hop gcn.circular",
"authors": "Rahul Gupta at Aryabhatta Research Institute of Observational Sciences (ARIES) India <rahulbhu.c157@gmail.com>",
"data": {
"date": "24/01/05 18:01:34 GMT",
"from": "Rahul Gupta at Aryabhatta Research Institute of Observational Sciences (ARIES) India <rahulbhu.c157@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35486"
},
"title": "GCN CIRCULAR",
"number": "35486",
"subject": "GRB 240101A: 1.3m DFOT optical observations"
},
"message_text": "Rahul Gupta, Amit K. Ror, Amar Aryan, and Shashi B. Pandey (ARIES) report\non behalf of a larger collaboration:\n\nWe performed the optical follow-up observations of the field of new year\nburst GRB 240101A detected by Swift (Cenko et al. 2024, GCN 35448),\nutilizing the 1.3m Devasthal Fast Optical Telescope (DFOT) situated at the\nDevasthal Observatory of the Aryabhatta Research Institute of Observational\nSciences (ARIES), India. Our observations started on 2024-01-01 at 15:37:15\nUT, approximately 1.28 hours post-detection. Multiple frames were captured in\nthe R filter with an exposure time of 300 seconds each. Subsequently, we\naligned and stacked the images. In our stacked image, no optical afterglow\nwas detected within the enhanced Swift-XRT error box (Beardmore et al.\n2024, GCN 35452), resulting in a preliminary 3-sigma upper limit of ~ 22.4\nmag. This non-detection is consistent with the observations of Zheng et al.\n2024, GCN 35453; Kuin et al. 2024, GCN 35457; and Volnova et al. 2024, GCN\n35460.\n\nAdditionally, we observed a potential signature of very faint optical\nemission at the position of the optical source reported by Volnova et al.\n2024, GCN 35460. The detected faint optical source (if related) may\npotentially represent a candidate afterglow or the associated host galaxy\nof GRB 240101A. Further deep follow-up observations using larger telescopes\nwill help to unveil the true nature of the optical source.\n\nThe magnitude is not corrected for the Galactic extinction in the direction\nof the burst. Photometric calibration is performed using the standard stars\nfrom the USNO-B1.0 catalog. This circular may be cited.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35486.",
"published": "2024-01-05T18:01:46.396021Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T18:01:46.396038Z",
"modified": "2024-01-05T18:01:46.402326Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5710,
"topic": "gcn.circular",
"uuid": "ef514d20-7aa6-4e48-90fe-041fef02b393",
"title": "IceCube Alert 240105.52: 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": "24/01/05 18:39:37 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35487"
},
"title": "GCN CIRCULAR",
"number": "35487",
"subject": "IceCube Alert 240105.52: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the IceCube Alert 240105.52 (trigger No 46175426,04h 51m 34.32s , +11d 19m 33.6s, R=0.51) errorbox 19544 sec after notice time and 19590 sec after trigger time at 2024-01-05 17:54:12 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 53 deg. The sun altitude is -60.5 deg.\n\nThe galactic latitude b = -20 deg., longitude l = 188 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#49706\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 19620 | 2024-01-05 17:54:12 | MASTER-Tunka | (04h 50m 09.32s , +11d 20m 03.7s) | C | 60 | 19.2 |\n 19692 | 2024-01-05 17:55:24 | MASTER-Tunka | (04h 48m 31.89s , +10d 42m 29.0s) | C | 60 | 19.2 |\n 19765 | 2024-01-05 17:56:37 | MASTER-Tunka | (04h 56m 33.65s , +10d 41m 42.0s) | C | 60 | 19.1 |\n 20781 | 2024-01-05 18:13:33 | MASTER-Tunka | (04h 50m 07.23s , +11d 21m 11.9s) | C | 60 | 19.1 |\n 20851 | 2024-01-05 18:14:43 | MASTER-Tunka | (04h 48m 30.57s , +10d 42m 36.6s) | C | 60 | 18.9 |\n 20922 | 2024-01-05 18:15:54 | MASTER-Tunka | (04h 56m 33.87s , +10d 41m 52.7s) | C | 60 | 18.9 |\n 21671 | 2024-01-05 18:28:23 | MASTER-Tunka | (04h 50m 10.39s , +11d 19m 34.3s) | C | 60 | 18.9 |\n 21832 | 2024-01-05 18:31:04 | MASTER-Tunka | (04h 48m 24.56s , +10d 43m 53.3s) | C | 60 | 18.9 |\n 21905 | 2024-01-05 18:32:17 | MASTER-Tunka | (04h 56m 39.39s , +10d 43m 11.8s) | C | 60 | 19.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35487.",
"published": "2024-01-05T18:39:49.361500Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T18:39:49.361516Z",
"modified": "2024-01-05T18:39:49.369028Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5711,
"topic": "gcn.circular",
"uuid": "a215340e-6c58-420e-8416-da1dfda3266e",
"title": "GRB GRB240101C: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "24/01/05 18:41:54 GMT",
"from": "sumanbala2210@gmail.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35488"
},
"title": "GCN CIRCULAR",
"number": "35488",
"subject": "GRB GRB240101C: Fermi GBM observation"
},
"message_text": "S. Bala (USRA), B. Mailyan (Florida Tech) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\n\"At 12:57:23.76 UT on 01 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240101C (trigger 725806648/240101540),\nwhich was also detected by the Swift/BAT-GUANO (J. DeLaunay et. al. 2023, GCN 35482),\nGRBAlpha (Dafcikova et al. GCN Circ. 35459) and AstroSat CZTI (Navaneeth et al.\nGCN 35478). The Fermi GBM on-ground calculated location, using the Fermi GBM\ntrigger data has been reported at GCN 35451.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 69.0 degrees.\n\nThe GBM light curve consists of one very short peak\nwith a duration (T90) of about 0.35 s (50-300 keV).\nThe time-averaged spectrum from T0-0.064 s to T0+0.256 s is\nbest fit by a Comptonized Epeak function with Epeak = 286.4 +/- 21.8 keV, and\nalpha = 0.10 +/- 0.14.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.19 +/- 0.07)E-6 erg/cm^2. The 64-msec peak photon flux measured\nstarting from T0 in the 10-1000 keV band\nis 460.9 +/- 77.4 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 242.7 +/- 28.8 keV, alpha = 0.30 +/- 0.20 and beta = -2.50 +/- 0.39.\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35488.",
"published": "2024-01-05T18:42:01.690586Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T18:42:01.690602Z",
"modified": "2024-01-05T18:42:01.695355Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5712,
"topic": "gcn.circular",
"uuid": "a73dea89-fa02-490a-bc65-b3550dcb845b",
"title": "IPN triangulation of GRB 240101C (short)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/01/05 19:17:11 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35489"
},
"title": "GCN CIRCULAR",
"number": "35489",
"subject": "IPN triangulation of GRB 240101C (short)"
},
"message_text": "D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nand\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team, report:\n\nThe short-duration GRB 240101C\n(Fermi-GBM detection: The Fermi GBM team, GCN 35451;\nBala et al., GCN 35488;\nGRBAlpha detection: Dafcikova et al., GCN 35459;\nAstroSat-CZTI detection: Navaneeth et al., GCN 35478;\nSwift-BAT/GUANO detection: DeLaunay et al., GCN 35482)\nhas been detected by Fermi (GBM trigger 725806648), Swift (BAT), GRBAlpha, Konus-Wind, INTEGRAL (SPI-ACS), and AstroSat (CZTI),\nso far, at about 46644 s UT (12:57:24).\nThe burst was outside the coded field of view of the BAT.\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 358.487 (23h 53m 57s) +28.743 (+28d 44' 36\")\n Corners:\n 0.797 (00h 03m 11s) +24.032 (+24d 01' 56\")\n 1.127 (00h 04m 30s) +23.926 (+23d 55' 33\")\n 355.725 (23h 42m 54s) +33.705 (+33d 42' 18\")\n 355.318 (23h 41m 16s) +33.852 (+33d 51' 06\")\n ---------------------------------------------\nThe error box area is 2.5 sq. deg and its maximum\ndimension is 11.15 deg (the minimum one is 14 arcmin).\nThe Sun distance was 90 deg.\n\nThis localization may be improved.\n\nThe IPN localization is consistent with, but reduces the area of,\nthe Fermi-GBM localizations.\n\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240101_T46643/IPN/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35489.",
"published": "2024-01-05T19:17:22.283811Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-05T19:17:22.283828Z",
"modified": "2024-01-05T19:17:22.290588Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5843,
"topic": "gcn.circular",
"uuid": "1964a84c-d3c6-4514-85d2-caa6259377a5",
"title": "Swift Trigger 1209406 is not an astrophysical event",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/17 17:43:28 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35556"
},
"title": "GCN CIRCULAR",
"number": "35556",
"subject": "Swift Trigger 1209406 is not an astrophysical event"
},
"message_text": "\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift trigger 1209406 was also caused by a star track loss-of-lock\nevent, and is not an interesting event itself.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35556.",
"published": "2024-01-17T17:43:38.477062Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T17:43:38.477078Z",
"modified": "2024-01-17T17:43:38.483858Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5715,
"topic": "gcn.circular",
"uuid": "a6a8bd9f-7983-45a3-9aa0-e04821890765",
"title": "GRB 240106B: 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": "24/01/06 06:32:05 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35492"
},
"title": "GCN CIRCULAR",
"number": "35492",
"subject": "GRB 240106B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 06:21:20 UT on 6 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240106B (trigger 726214885.929338 / 240106265).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.8, Dec = -22.5 (J2000 degrees, equivalent to J2000 15h 59m, -22d 30'), with a statistical uncertainty of 5.4 degrees.\n\nThe angle from the Fermi LAT boresight is 43.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106265/quicklook/glg_skymap_all_bn240106265.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/2024/bn240106265/quicklook/glg_healpix_all_bn240106265.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106265/quicklook/glg_lc_medres34_bn240106265.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35492.",
"published": "2024-01-06T06:32:20.243936Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-06T06:32:20.243953Z",
"modified": "2024-01-06T06:32:20.253263Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5719,
"topic": "gcn.circular",
"uuid": "336af53d-c612-4c23-8fc7-2428eb37a239",
"title": "LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "ì´íì (Hyung) at Inje University <ijhwlee@gmail.com>",
"data": {
"date": "24/01/07 03:40:11 GMT",
"from": "ì´íì (Hyung) at Inje University <ijhwlee@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35493"
},
"title": "GCN CIRCULAR",
"number": "35493",
"subject": "LIGO/Virgo/KAGRA S240107b: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S240107b during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2024-01-07 01:32:15.720 UTC (GPS time: 1388626353.720). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS240107b is an event of interest because its false alarm rate, as estimated by the online analysis, is 5.8e-08 Hz, or about one in 6 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S240107b\n\nThe classification of the GW signal, in order of descending probability, is BBH (97%), Terrestrial (3%), NSBH (<1%), or BNS (<1%).\n\nThere were noise transients (glitches) in the LIGO Hanford and Livingston detectors near the time of the signal which may affect the parameters or the significance of the candidate.\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 29 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 3961 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3890 +/- 1212 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35493.",
"published": "2024-01-07T03:40:26.703948Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-07T03:40:26.703962Z",
"modified": "2024-01-07T03:40:26.710215Z",
"nonlocalizedevents": [
{
"event_id": "S240107b"
}
],
"targets": []
},
{
"id": 5856,
"topic": "gcn.circular",
"uuid": "54e9747e-052d-49e4-89c0-1435e19a9298",
"title": "GRB 240117A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/18 21:30:43 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35569"
},
"title": "GCN CIRCULAR",
"number": "35569",
"subject": "GRB 240117A: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J.E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:\n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240117A, which was also detected by CALET/CGBM (Trigger 1389556167) and INTEGRAL/SPI-ACS (Trigger 10476).\n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-17 19:52:29.928 with a duration of 9.2 s and a total significance of about 35.3 sigma. The light curve comprises two primary peaks.\n \nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.9 and a cutoff energy (\"Epeak\") of 264 keV. The modeled 10-10000 keV fluence is 3.8e-06 erg/cm^2.\n \nThe best-fit localization is RA, Decl. (J2000, deg) = 229.6, 3.1 with a radius of 18.7 deg (95% confidence), with a highly uncertain systematic uncertainty.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35569.",
"published": "2024-01-18T21:30:56.193005Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T21:30:56.193024Z",
"modified": "2024-01-18T21:30:56.201544Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5723,
"topic": "gcn.circular",
"uuid": "f0649e41-3e2e-43d6-9a32-24cb498523a0",
"title": "GRB 240107A: MAXI/GSC detection",
"submitter": "Hop gcn.circular",
"authors": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
"data": {
"date": "24/01/08 02:37:58 GMT",
"from": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35495"
},
"title": "GCN CIRCULAR",
"number": "35495",
"subject": "GRB 240107A: MAXI/GSC detection"
},
"message_text": "T. Kurihara (JAXA), H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, E.Goto (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani, Y. Okada (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC), and W. Iwakiri (Chiba U.)\n\nThe MAXI/GSC nova alert system triggered on a bright uncatalogued X-ray transient source\nat 19:15:47 UT on January 7, 2023.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (298.014 deg, -68.228 deg) = (19 52 03, -68 13 39) (J2000)\nwith a 90% C.L. statistical error of 0.41 deg and an additional systematic uncertainty of 0.1 deg\n(90% containment radius). The X-ray flux averaged over the scan was 114 +- 24 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (296.278, -67.736) deg = (19 45 06, -67 44 09) (J2000)\n(R.A., Dec) = (296.022, -68.496) deg = (19 44 05, -68 29 45) (J2000)\n(R.A., Dec) = (303.762, -68.679) deg = (20 15 02, -68 40 44) (J2000)\n(R.A., Dec) = (303.766, -67.913) deg = (20 15 03, -67 54 46) (J2000)\nThere was no significant excess flux in the previous transit at 17:42 UT\nand in the next transit at 20:48 UT with an upper limit of 20 mCrab for each.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35495.",
"published": "2024-01-08T02:38:08.463910Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-08T02:38:08.463928Z",
"modified": "2024-01-08T02:38:08.471463Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5725,
"topic": "gcn.circular",
"uuid": "944269dc-4a5e-472c-b682-d56db75aae30",
"title": "LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification",
"submitter": "Hop gcn.circular",
"authors": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"data": {
"date": "24/01/08 06:13:28 GMT",
"from": "Soichiro Morisaki at U. of Tokyo <soichiro.morisaki@ligo.org>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35496"
},
"title": "GCN CIRCULAR",
"number": "35496",
"subject": "LIGO/Virgo/KAGRA S240107b: Updated Sky localization and Source Classification"
},
"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 S240107b (GCN Circular 35493). 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/S240107b\n\nAfter parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (97%), Terrestrial (3%), NSBH (<1%), or BNS (<1%).\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 4143 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 6089 +/- 2429 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n[1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023)\n[2] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35496.",
"published": "2024-01-08T06:13:40.217142Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-08T06:13:40.217159Z",
"modified": "2024-01-08T06:13:40.223976Z",
"nonlocalizedevents": [
{
"event_id": "S240107b"
}
],
"targets": []
},
{
"id": 5726,
"topic": "gcn.circular",
"uuid": "b5e78663-0025-4dc3-9009-c67854c46634",
"title": "GRB 240106A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/08 09:43:50 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35497"
},
"title": "GCN CIRCULAR",
"number": "35497",
"subject": "GRB 240106A: 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, L. Szakszonova, 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.), T. 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 long-duration GRB 240106A (Fermi/GBM detection: GCN 35490; CALET/CGBM detection: trigger no. 1388536424; INTEGRAL/SPI-ACS peak detection at 2024-01-06 ~00:36:35 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2024-01-06 00:36:37 UTC. The T90 duration measured by GRBAlpha is 148 s and the overall significance during T90 reaches 16 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240106A_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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35497.",
"published": "2024-01-08T09:44:03.436734Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-08T09:44:03.436750Z",
"modified": "2024-01-08T09:44:03.444076Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5727,
"topic": "gcn.circular",
"uuid": "7e6eca2a-62ce-4815-8c5a-157a9d395527",
"title": "Update of IceCube-240105A - Corrected errors",
"submitter": "Hop gcn.circular",
"authors": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"data": {
"date": "24/01/08 16:26:08 GMT",
"from": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35498"
},
"title": "GCN CIRCULAR",
"number": "35498",
"subject": "Update of IceCube-240105A - Corrected errors"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nThe directional errors of the high-energy track-like event IceCube-240105A reported in GCN circular 35485 were incorrectly reported, as they were not taking into consideration ice systematics. All other information was correct. The corrected refined directional information is:\n\nDate: 2024-01-05\nTime: 12:27:42.57 UT\nRA: 72.69 (+1.92, -1.85 deg 90% PSF containment) J2000\nDec: +11.42 (+0.50, -0.44 deg 90% PSF containment) J2000\n\nIn addition to the previously reported event in the 90% uncertainty region, one additional gamma-ray source listed in the 4FGL Fermi-LAT catalog is also found. The source is 4FGL J0458.0+1152, associated with a Blazar candidate, and located 1.8 deg away from the best-fit position. The source is also listed in the Fermi 3FHL catalog as 3FHL J0458.0+1151. \n\nWe apologize for the error. \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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35498.",
"published": "2024-01-08T16:26:22.536395Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-08T16:26:22.536411Z",
"modified": "2024-01-08T16:26:22.543461Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5729,
"topic": "gcn.circular",
"uuid": "9e2dad22-979e-41f7-9353-a837ee249a9b",
"title": "IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources",
"submitter": "Hop gcn.circular",
"authors": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"data": {
"date": "24/01/08 17:04:31 GMT",
"from": "Kuiyun Huang at CYCU <kuiyun@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35499"
},
"title": "GCN CIRCULAR",
"number": "35499",
"subject": "IceCube-240105A: JCMT SCUBA2 Detection of Two Bright Submillimeter Sources"
},
"message_text": "K.Y. Huang and Y. Urata, on behalf of a large collaboration\n\nSCUBA2 onboard JCMT captured images in 450um and 850um encompassing\nthe entire 90% PSF containment region of IceCube-240105A (GCN\nCirc. #35485) on January 6, 2024. No sources with an rms of 7 mJy were\ndetected within the 90% PSF containment region of IceCube-240105A. However,\nthe 850μm map revealed the presence of two bright sources near the\nperiphery of the 90% PSF containment region. These sources are identified\nas PKS 0446+11 and the flat spectrum radio quasar (or Blazar, hereafter\nJ0448+1127), previously cataloged in various publications.\n\nSCUBA2 measured the peak flux for PKS 0446+11 as\n1130 mJy at 850um\n838 mJy at 450um\n\nCombined with the ALMA calibrator source catalog, the light curve\npeaked on November 5, 2023. The SCUBA2 measurement indicates a slight\nfading from the peak.\n\nThe other source, J0448+1127, is located at 04:49:07.754 +11:21:31\nwith 13 arcsec error, 0.48 deg away from the IceCube's best-fit\nposition. Catalog matching indicates the source is FSRQ, with redshift\n1.375 recorded in various catalogs. SCUBA2 measured the peak flux as\n104 mJy at 850um. Although there are no suitable reference observations for\nvariability checking, the source may exhibit brightening based on\ncomparisons with the last observation by ALMA in 2021 with a similar\nwavelength.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35499.",
"published": "2024-01-08T17:04:43.496738Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-08T17:04:43.496754Z",
"modified": "2024-01-08T17:04:43.504464Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5730,
"topic": "gcn.circular",
"uuid": "16e5b69c-5af2-4b58-b514-4fabf70547a4",
"title": "LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "24/01/09 02:22:02 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35500"
},
"title": "GCN CIRCULAR",
"number": "35500",
"subject": "LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Jamie A. Kennea (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Tyler Parsotan (NASA GSFC), James DeLaunay (PSU) report:\n\nSwift/BAT was observing 69.2% of the GW localization probability (Bilby.multiorder.fits) at merger time. A fraction 14.5% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 12.0 8.40 7.55 9.27\n1.024 6.11 4.27 3.84 4.71\n4.096 3.25 2.27 2.04 2.51\n16.38 1.97 1.38 1.24 1.52\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.10471376\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.10471381\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35500.",
"published": "2024-01-09T02:22:15.787524Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T02:22:15.787549Z",
"modified": "2024-01-09T02:22:15.795673Z",
"nonlocalizedevents": [
{
"event_id": "S240104b"
}
],
"targets": []
},
{
"id": 6544,
"topic": "gcn.circular",
"uuid": "72c73c29-6fce-4662-a813-20a55115d574",
"title": "GRB 240414A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/04/14 02:36:27 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36083"
},
"title": "GCN CIRCULAR",
"number": "36083",
"subject": "GRB 240414A: Swift detection of a burst"
},
"message_text": "\nR. Caputo (GSFC), C. Gronwall (PSU), J.D. Gropp (PSU),\nA. Y. Lien (U Tampa), M. J. Moss (GSFC), K. L. Page (U Leicester) and\nD. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 02:20:36 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240414A (trigger\u001221714). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 184.786, +56.727 which is\n RA(J2000) = 12h 19m 09s\n Dec(J2000) = +56d 43' 37\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of at least 60 sec, with a possible smaller\npeak around T+120s (during the XRT observation). The peak count rate\nwas ~2600 counts/sec (15-350 keV), at ~2 sec after the trigger.\n\nThe XRT began observing the field at 02:22:19.6 UT, 103.2 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 184.7855, 56.7381 which is equivalent to:\n RA(J2000) = 12h 19m 8.52s\n Dec(J2000) = +56d 44' 17.2\"\nwith an uncertainty of 4.9 arcseconds (radius, 90% containment). This\nlocation is 39 arcseconds from the BAT onboard position, within the BAT\nerror circle. No event data are yet available to determine the column\ndensity using X-ray spectroscopy.\n\nUVOT data are not available at this time.\n\nBurst Advocate for this burst is R. Caputo (regina.caputo AT nasa.gov).\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\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36083.",
"published": "2024-04-14T02:36:41.229356Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T02:36:41.229372Z",
"modified": "2024-04-14T02:36:41.235167Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6546,
"topic": "gcn.circular",
"uuid": "d83b8e47-63b1-4e11-a6d2-85b13782257c",
"title": "GRB 240414A : OHP/T193 optical counterpart detection",
"submitter": "Hop gcn.circular",
"authors": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"data": {
"date": "24/04/14 03:35:59 GMT",
"from": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36084"
},
"title": "GCN CIRCULAR",
"number": "36084",
"subject": "GRB 240414A : OHP/T193 optical counterpart detection"
},
"message_text": "B. Schneider (MIT), C. Adami, O. Ilbert, S. de la Torre (LAM/Pytheas/AMU) report on behalf of a larger collaboration:\n\nWe observed the field of the GRB 240414A (Caputo et al., GCN 36083) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. In a single exposure of 60s in the r-band at 02:56:37UT on 2024-04-14 (36 min after the trigger), we clearly detect a source consistent with the XRT error:\nThe preliminary magnitude derived for that source is\nr = 17.61 +/- 0.01 mag (AB)\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and the magnitude is not corrected for Galactic extinction.\nSpectroscopy observations using MISTRAL are currently on going.\nWe acknowledge the excellent support from Observatoire de Haute-Provence and in particular Jean-Pierre Troncin for the MISTRAL observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36084.",
"published": "2024-04-14T03:36:16.231057Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T03:36:16.231075Z",
"modified": "2024-04-14T03:36:16.239211Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6547,
"topic": "gcn.circular",
"uuid": "712ae6aa-c584-4c2e-9caf-2946ef3cd198",
"title": "GRB 240414A : OHP/T193 redshift determination",
"submitter": "Hop gcn.circular",
"authors": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"data": {
"date": "24/04/14 04:55:18 GMT",
"from": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36085"
},
"title": "GCN CIRCULAR",
"number": "36085",
"subject": "GRB 240414A : OHP/T193 redshift determination"
},
"message_text": "C. Adami, O. Ilbert, S. de la Torre (LAM/Pytheas/AMU), A. de Ugarte Postigo (OCA/LAM), report on behalf\nof a larger collaboration:\n\nWe observed the optical counterpart of GRB 240414A (Caputo et al., GCN 36083, Schneider et al., GCN 36084)\nin spectroscopy with the MISTRAL instrument in blue mode using the T193cm telescope at Observatoire de\nHaute-Provence (France).\n\nWe detect the optical GRB afterglow at RA = 12:19:08.08 and DEC = +56:44:28.8 (J2000).\n\nOur spectra cover the wavelength range 4200-8000 AA and consist of 3 exposures of 900 seconds each.\nObservations started at 03:17:09 UT on April 14, 2024 (~57 min after the X-ray trigger). We detect a strong\ncontinuum with absorption features which we identify as AlII, AlIII, FeII, MnII and MgII at a common redshift\nof z=1.833 that we interpret as the redshift of GRB 240414A.\n\nOur photometric data reduction continue with g' band observations.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence and in particular Jean-Pierre Troncin\nfor the MISTRAL observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36085.",
"published": "2024-04-14T04:55:34.693996Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T04:55:34.694010Z",
"modified": "2024-04-14T04:55:34.700955Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6548,
"topic": "gcn.circular",
"uuid": "c4a27117-721f-4411-9413-47a2f4f7e257",
"title": "EP240413a: EP-WXT detection of a fast X-ray transient ",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/14 05:05:38 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36086"
},
"title": "GCN CIRCULAR",
"number": "36086",
"subject": "EP240413a: EP-WXT detection of a fast X-ray transient "
},
"message_text": "T. Y. Lian, X. Pan, Z. X. Ling, Y. Liu, Z. X. Ling, C. Zhang, C. C. Jin, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, X. Mao, H. W. Pan, H. Sun, W. X. Wang, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, W. Yuan, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), J. Yang, C. Y. Dai (NJU), Z. T. Fang (PMO), Y. Chen, S. M. Jia, S. N. Zhang (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe team \n \nWe report on the detection of a fast X-ray transient EP240413a at 2024-04-13T14:39:37 (UTC) by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission during a calibration observation. The position of the source is R.A. = 228.794 deg, DEC = -18.800 deg (J2000) with an uncertainty of 20 arcmin in radius (90% C.L. statistical and systematic). The larger positioning uncertainty than the nominal value is due to the so far incomplete calibration of the WXT module which detected the source. The transient event lasts for ~200 seconds and has a peak flux of ~7 x 10^-9 erg/s/cm^2 in the 0.5-4 keV band. The averaged 0.5-4 keV spectrum can be fitted with an absorbed power law with a photon index of 1.6(-0.2/+0.1) (with the column density fixed at the Galactic value of 1.12 x 10^21 cm^-2), giving an unabsorbed flux of 1.1(-0.1/+0.1) x 10^-9 erg/s/cm2 in the 0.5-4 keV band. The 1-sigma uncertainties are given for the above parameters. We note that the derived source parameters may be subject to larger uncertainties than those quoted here since in-orbit calibration of the instrument is still in progress.\n \nNo previously known X-ray sources at a similar flux level are found within the 20 arcmin region around the source position.\n \nThe above observation was made with the WXT instrument during the commissioning phase of EP. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36086.",
"published": "2024-04-14T05:05:54.730383Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T05:05:54.730406Z",
"modified": "2024-04-14T05:05:54.736437Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6795,
"topic": "gcn.circular",
"uuid": "864d0ead-1ed6-4552-9bcb-c4ffcde4293d",
"title": "EP240417a: no counterpart detection by SOAR",
"submitter": "Hop gcn.circular",
"authors": "JONATHAN QUIROLA VASQUEZ <jaquirola@uc.cl>",
"data": {
"date": "24/04/21 16:01:11 GMT",
"from": "JONATHAN QUIROLA VASQUEZ <jaquirola@uc.cl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36211"
},
"title": "GCN CIRCULAR",
"number": "36211",
"subject": "EP240417a: no counterpart detection by SOAR"
},
"message_text": "J. Quirola-Vásquez (Radboud Univ.), F. E. Bauer (PUC), P.G. Jonker (Radboud Univ.), A. J. Levan (Radboud Univ. & Warwick Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.) on behalf of a larger collaboration:\n\nWe observed the field of the Einstein Probe fast X-ray transient EP240417a (Hu et al., GCN 36161) with the SOAR telescope of Cerro Pachón observatory on 2024-04-20 starting (UT) 00:22:04.167, i.e., ~2.4 days after the X-ray trigger. We took 2 images using the Goodman Spectrograph RedCam in imaging mode, and the i-SDSS filter, with a total exposure time of 1100 seconds. We did not detect an optical counterpart in the field of EP240417a (R.A. = 177.442 deg and DEC = -15.438 deg, with an uncertainty of 3 arcmin) down to the limiting magnitude of i~23 AB mag. None new detection or >2sigma variability regarding the Legacy catalog. We used the PanSTARRS catalog as the magnitude reference for calibration.\n\nWe acknowledge the excellent support from the SOAR staff.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36211.",
"published": "2024-04-21T16:01:27.574163Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-21T16:01:27.574181Z",
"modified": "2024-04-21T16:01:27.583612Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5731,
"topic": "gcn.circular",
"uuid": "b9f57fca-c3bb-4ba0-b0db-8aebef33d1cc",
"title": "GRB 240109A: Swift detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "24/01/09 04:15:10 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35501"
},
"title": "GCN CIRCULAR",
"number": "35501",
"subject": "GRB 240109A: Swift detection of a short burst"
},
"message_text": "\nS. Dichiara (PSU), D. M. Palmer (LANL) and M. H. Siegel (PSU) report\non behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 04:01:35 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240109A (trigger\u001207446). Due to a Sun constraint,\nSwift did not slew immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 301.318, +16.578 which is\n RA(J2000) = 20h 05m 16s\n Dec(J2000) = +16d 34' 39\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a single spike\nstructure with a duration of about 0.25 sec. The peak count rate\nwas ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger.\n\nDue to a Sun observing constraint, Swift cannot slew to the BAT\nposition until 00:14 UT on 2024 March 01. There will thus be no XRT or\nUVOT data for this trigger before this time.\n\nBurst Advocate for this burst is S. Dichiara (sbd5667 AT psu.edu).\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\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35501.",
"published": "2024-01-09T04:15:23.234152Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T04:15:23.234168Z",
"modified": "2024-01-09T04:15:23.241280Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5735,
"topic": "gcn.circular",
"uuid": "c3cbe1d2-a0c3-44dd-90aa-2f7ccfc7f73e",
"title": "LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "u7613476@anu.edu.au",
"data": {
"date": "24/01/09 05:32:47 GMT",
"from": "u7613476@anu.edu.au",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35502"
},
"title": "GCN CIRCULAR",
"number": "35502",
"subject": "LIGO/Virgo/KAGRA S240109a: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S240109a during real-time processing of data from LIGO Hanford Observatory (H1) at 2024-01-09 05:04:31.842 UTC (GPS time: 1388811889.842). The candidate was found by the GstLAL [1] analysis pipeline.\n\nS240109a is an event of interest because its false alarm rate, as estimated by the online analysis, is 7.3e-09 Hz, or about one in 4 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S240109a\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 31 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [3], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 24220 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1529 +/- 515 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35502.",
"published": "2024-01-09T05:32:57.932419Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T05:32:57.932434Z",
"modified": "2024-01-09T05:32:57.938407Z",
"nonlocalizedevents": [
{
"event_id": "S240109a"
}
],
"targets": []
},
{
"id": 5736,
"topic": "gcn.circular",
"uuid": "a0c95e42-6fc4-4761-90fa-fc7499eef287",
"title": "GRB 240107A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/09 07:01:04 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35503"
},
"title": "GCN CIRCULAR",
"number": "35503",
"subject": "GRB 240107A: AstroSat CZTI detection"
},
"message_text": "J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240107A which was also detected by MAXI-GSC (Kurihara et al., GCN Circ. 35495).\n\nThe source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-01-07 19:16:32.4 UTC. The measured peak count rate associated with the burst is 191 (+66, -13) counts/s above the background in the combined data of three quadrants (out of four), with a total of 6807 (+1623, -1781) counts. The local mean background count rate was 1088 (+3, -4) counts/s. We measure a T90 of 160 (+18, -10) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35503.",
"published": "2024-01-09T07:01:15.698591Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T07:01:15.698607Z",
"modified": "2024-01-09T07:01:15.706630Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5737,
"topic": "gcn.circular",
"uuid": "8d165515-4d1e-43e8-a8d7-e1c0fc6af854",
"title": "Swift GRB240109.17: 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": "24/01/09 10:34:27 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35504"
},
"title": "GCN CIRCULAR",
"number": "35504",
"subject": "Swift GRB240109.17: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB240109.17 (trigger No 1207446,20h 05m 16.32s , +16d 34m 40.8s, R=0.05) errorbox 22878 sec after notice time and 22901 sec after trigger time at 2024-01-09 10:23:16 UT, with upper limit up to 15.7 mag. Observations started at twilight. The observations began at zenith distance = 62 deg. The sun altitude is -9.6 deg.\n\nThe galactic latitude b = -8 deg., longitude l = 57 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#51675\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 22905 | MASTER-Tunka | C | 5 | 15.4 |\n 22919 | MASTER-Tunka | C | 5 | 15.4 |\n 22985 | MASTER-Tunka | C | 1 | 15.0 |\n 23053 | MASTER-Tunka | C | 1 | 15.0 |\n 23127 | MASTER-Tunka | C | 5 | 15.7 |\n 23260 | MASTER-Tunka | C | 5 | 15.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35504.",
"published": "2024-01-09T10:34:38.011992Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T10:34:38.012010Z",
"modified": "2024-01-09T10:34:38.019810Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6549,
"topic": "gcn.circular",
"uuid": "d5ee858b-3a81-45db-bd6f-eb9a986611c3",
"title": "GRB 240414A: Redshift confirmation from GTC/OSIRIS+",
"submitter": "Hop gcn.circular",
"authors": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"data": {
"date": "24/04/14 07:07:37 GMT",
"from": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36087"
},
"title": "GCN CIRCULAR",
"number": "36087",
"subject": "GRB 240414A: Redshift confirmation from GTC/OSIRIS+"
},
"message_text": "A. de Ugarte Postigo (CNRS, OCA, LAM), G. Lombardi (GRANTECAN), J. F. Agui Fernandez (CAHA), C. C. Thoene (ASU-CAS), J. P. U. Fynbo (DAWN/NBI), L. Izzo (INAF-OACn & DARK/NBI), N. R. Tanvir (U. Leicester), A. Martin-Carrillo (UCD), S. Geier (GRANTECAN) report:\n\nWe have obtained spectroscopy of the afterglow of GRB 240414A (Caputo et al. GCN 36083, Schneider et al. GCN 36084) with OSIRIS+ on the 10.4m GTC on the Roque de los Muchachos Observatory (Spain). The observation consisted of 3x900s exposure with grism R1000B covering the range between 3600 and 7880 AA at a mean epoch 2.11 hrs after the burst.\n\nWe detect a strong continuum over all the spectral range with absorption features that we identify as due to OI, CII, SiIV, SiII, CIV, AlII, NiII, AlIII, ZnII, FeII and MnII, as well as SiII* and FeII*, all at a common redshift of 1.833, consistent with the redshift determined by Adami et al. (GCN 36085).\n\nAdditionally, we identify an absorption system with CIV and MgII at z=1.703 and another one with MgII at z=1.067. Finally, there is a further strong and slightly broadened feature at 4056 AA that could be due to an intervening system of CIV at z=1.618, but there are no other related features to confirm it.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36087.",
"published": "2024-04-14T07:07:53.321638Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T07:07:53.321653Z",
"modified": "2024-04-14T07:07:53.329903Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5738,
"topic": "gcn.circular",
"uuid": "7149464d-1c88-485b-99bc-ba50b5d92565",
"title": "GRB 230812B: further radio observations with the VLA",
"submitter": "Hop gcn.circular",
"authors": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"data": {
"date": "24/01/09 13:22:01 GMT",
"from": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35505"
},
"title": "GCN CIRCULAR",
"number": "35505",
"subject": "GRB 230812B: further radio observations with the VLA"
},
"message_text": "S. Giarratana (University of Bologna, INAF-IRA), M. Giroletti\n(INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.)\n\nAt 18:39:38 UT on 2023 August 29 (T_mid = 17.0 days post-burst)\nand at 17:37:02 UT on 2023 September 19 (T_mid = 38.0 days\npost-burst) the Karl G. Jansky VLA started observing the field of\nGRB 230812B (Fermi GBM team, GCN 34386) at a central\nfrequency of 6 and 10 GHz.\n\nThe standard J1331+3030 (3C286) was used as bandpass and\nflux density calibrator, while J1637+4717 was used as complex\ngain calibrator.\n\nFrom a preliminary analysis, the radio counterpart of GRB 230812B\n(Rhodes et al., GCN 34433; de Ugarte Postigo et al., GCN 34468;\nGiarratana et al., GCN 34552; Chandra et al., GCN 34735) is no\nlonger detected. We derive the following upper limits (UL; 3sigma).\n\n====================================================T_mid Freq UL r.m.s. Beam PA\n[days] [GHz] [uJy] [uJy/b] [arcsec] [deg]\n====================================================17.0 6 24 8 0.68x0.29 -71\n17.0 10 24 8 0.50x0.18 -65\n38.0 6 21 7 0.60x0.29 -74\n38.0 10 21 7 0.40x0.18 -70\n====================================================\nWe note that the 6 GHz upper limit at 17 days post-burst seems\ninconsistent with the detection reported by Chandra et al., GCN 34735,\nat the same frequency.\n\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF161095,\napproved in the framework of the Fermi - NRAO joint program agreement.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35505.",
"published": "2024-01-09T13:22:11.902450Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T13:22:11.902465Z",
"modified": "2024-01-09T13:22:11.909341Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5739,
"topic": "gcn.circular",
"uuid": "59fb99f6-783a-4bc0-b3e4-e946abe91c0b",
"title": "GRB 230818A: further radio observations with the VLA",
"submitter": "Hop gcn.circular",
"authors": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"data": {
"date": "24/01/09 13:30:14 GMT",
"from": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35506"
},
"title": "GCN CIRCULAR",
"number": "35506",
"subject": "GRB 230818A: further radio observations with the VLA"
},
"message_text": "S. Giarratana (University of Bologna, INAF-IRA), M. Giroletti\n(INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.)\n\n\nAt 22:56:54 UT on 2023 September 18 (T_mid = 31.0 days post-burst)\nand at 17:12:33 UT on 2023 November 28 (T_mid = 101.8 days\npost-burst) the Karl G. Jansky VLA started observing the field of\nGRB 230818A (Fermi GBM team, GCN 34478; Tohuvavohu et al.,\nGCN 34479) at a central frequency of 6 and 10 GHz.\n\nThe standard J1331+3030 (3C286) was used as bandpass and\nflux density calibrator, while J1912+3740 was used as complex\ngain calibrator.\n\nFrom a preliminary analysis, we do not detect the radio counterpart\nof GRB 230818A. We derive the following upper limits (UL; 3sigma).\n\n====================================================T_mid Freq UL r.m.s. Beam PA\n[days] [GHz] [uJy] [uJy/b] [arcsec] [deg]\n====================================================31.0 6 24 8 0.34x0.31 -64\n31.0 10 24 8 0.22x0.19 -75\n101.8 6 30 10 13.2x9.94 -87\n101.8 10 24 8 9.05x6.06 -82\n====================================================\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF161095,\napproved in the framework of the Fermi - NRAO joint program agreement.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35506.",
"published": "2024-01-09T13:30:24.714842Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T13:30:24.714857Z",
"modified": "2024-01-09T13:30:24.721497Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5740,
"topic": "gcn.circular",
"uuid": "ad938d2a-2d66-4385-8077-027274879ffb",
"title": "GRB 231215A: radio detection with the VLA",
"submitter": "Hop gcn.circular",
"authors": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"data": {
"date": "24/01/09 13:31:45 GMT",
"from": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35507"
},
"title": "GCN CIRCULAR",
"number": "35507",
"subject": "GRB 231215A: radio detection with the VLA"
},
"message_text": "S. Giarratana (University of Bologna, INAF-IRA), M. Giroletti\n(INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.)\n\nAt 03:57:39 UT on 2023 December 20 (T_mid = 4.8 days post-burst) the\nKarl G. Jansky VLA started observing the field of GRB 231215A\n(D'Avanzo et al., GCN 35343) at a central frequency of 6 and 10 GHz.\n\nThe standard J0542+4951 was used as bandpass and flux density\ncalibrator, while J0102+5824 was used as complex gain calibrator.\n\nFrom a preliminary analysis, an unresolved radio source (Rhodes et al.,\nGCN 35397) is clearly detected at both frequencies at a position:\n\nRA: 00:38:57.53 +- 0.05\nDec: +57:38:50.7 +- 0.6\n\nThe surface brightness peak is 61 uJy/beam and 128 uJy/beam at 6\nand 10 GHz, respectively. The r.m.s. noise level of the images is\n7 uJy/beam at both 6 and 10 GHz.\n\nThe synthesized beams are 13.1 x 9.9 arcsec (PA: -66deg) at 6 GHz\nand 7.7 x 6.0 arcsec (PA: -59deg) at 10 GHz.\n\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF161095,\napproved in the framework of the Fermi - NRAO joint program agreement.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35507.",
"published": "2024-01-09T13:31:50.828060Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T13:31:50.828074Z",
"modified": "2024-01-09T13:31:50.832930Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5741,
"topic": "gcn.circular",
"uuid": "b0af5fed-f239-4e98-b66d-8b3e849e8a92",
"title": "Konus-Wind detection of GRB 240101C",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/01/09 15:07:11 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35508"
},
"title": "GCN CIRCULAR",
"number": "35508",
"subject": "Konus-Wind detection of GRB 240101C"
},
"message_text": "A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe short-duration GRB 240101C\n(Fermi-GBM detection: The Fermi GBM team, GCN 35451;\nBala et al., GCN 35488;\nGRBAlpha detection: Dafcikova et al., GCN 35459;\nAstroSat-CZTI detection: Navaneeth et al., GCN 35478;\nSwift-BAT/GUANO detection: DeLaunay et al., GCN 35482;\nIPN triangulation: Svinkin et al., GCN 35489)\ntriggered Konus-Wind at T0F643.329 s UT (12:57:23.329).\n\nThe burst light curve shows a single pulse\nwhich starts at ~T0-0.1 s and has a total duration of ~0.3 s.\nThe emission is seen up to ~4 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240101_T46643/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.39(-0.19,+0.21)x10^-6 erg/cm2,\nand a 16-ms peak flux, measured from T0-0.002 s,\nof 1.57(-0.41,+0.43)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum of the burst\n(measured from T0 to T0+0.256 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.19(-0.41,+0.52)\nand Ep = 326(-56,+80) keV (chi2 = 15/22 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.4\n(chi2 = 15/21 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35508.",
"published": "2024-01-09T15:07:27.704408Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T15:07:27.704424Z",
"modified": "2024-01-09T15:07:27.712015Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5743,
"topic": "gcn.circular",
"uuid": "7f1587e4-a849-4075-84c1-5bda35e0a23a",
"title": "LIGO/Virgo/KAGRA S240109a: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Colm Talbot at University of Chicago <talbotcolm@gmail.com>",
"data": {
"date": "24/01/09 15:18:48 GMT",
"from": "Colm Talbot at University of Chicago <talbotcolm@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35509"
},
"title": "GCN CIRCULAR",
"number": "35509",
"subject": "LIGO/Virgo/KAGRA S240109a: 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) data around the time of the compact binary merger (CBC) candidate S240109a (GCN Circular 35502). 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/S240109a\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 28048 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1594 +/- 567 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35509.",
"published": "2024-01-09T15:18:59.774134Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T15:18:59.774149Z",
"modified": "2024-01-09T15:18:59.779250Z",
"nonlocalizedevents": [
{
"event_id": "S240109a"
}
],
"targets": []
},
{
"id": 5744,
"topic": "gcn.circular",
"uuid": "76ade228-ffd9-4cb5-a1b8-24bc00582bd2",
"title": "IceCube-240105A: Three candidates from the Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Jannis Necker at DESY <jannis.necker@desy.de>",
"data": {
"date": "24/01/09 19:28:50 GMT",
"from": "Jannis Necker at DESY <jannis.necker@desy.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35510"
},
"title": "GCN CIRCULAR",
"number": "35510",
"subject": "IceCube-240105A: Three candidates from the Zwicky Transient Facility"
},
"message_text": "Jannis Necker (DESY), Simeon Reusch (DESY), Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum) and Anna Franckowiak (DESY/Ruhr University Bochum) report:\n\nOn behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:\n\nAs part of the ZTF neutrino follow up program (Stein et al. 2023), we observed the localization region of the neutrino event Update of IceCube-240105A (Sommani et. al, GCN 35498) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g- and r-band beginning at 2024-01-06 02:38 UTC, approximately 14.2 hours after event time. We covered 74.4% (2.6 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 300s with a typical depth of 21.0 mag.\n\nThe images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019) . We are left with the following high-significance transient candidates by our pipeline, all lying within the 90.0% localization of the skymap.\n\n+---------------------------------------------------------------------------------+\n| ZTF Name | IAU Name | RA (deg) | DEC (deg) | Filter | Mag | MagErr |\n+---------------------------------------------------------------------------------+\n| ZTF23abtgfpu | AT2023ackx | 072.6719530 | +11.1938046 | r | 21.36 | 0.14 |\n| ZTF23abtgghf | AT2023acky | 073.9142070 | +11.0765116 | r | 21.61 | 0.17 |\n| ZTF24aaanwyg | AT2024ui | 073.3448656 | +11.8765801 | r | 20.34 | 0.06 |\n+---------------------------------------------------------------------------------+\n\n\n\nAmongst our candidates,\n\nZTF23abtgfpu and ZTF23abtgghf are probable supernovae based on their distance to the core of their respective host galaxy.\nThe nature of ZTF24aaanwyg is less clear.\n\nWe will resume our regular follow-up observation schedule to obtain more observations of these objects.\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.\n\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019).\nAlert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35510.",
"published": "2024-01-09T19:29:01.651923Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T19:29:01.651943Z",
"modified": "2024-01-09T19:29:01.663523Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6689,
"topic": "gcn.circular",
"uuid": "349b2cbd-6b8a-4c6f-89ed-246b1ddbf7a1",
"title": "GRB 240419A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/19 15:20:33 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36182"
},
"title": "GCN CIRCULAR",
"number": "36182",
"subject": "GRB 240419A: Swift-XRT refined Analysis"
},
"message_text": "A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), M. Perri\n(SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti\n(INAF-OAB), D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU)\nand P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 7.8 ks of XRT data for GRB 240419A, from 117 s to 33.6\nks after the BAT trigger. The data are entirely in Photon Counting\n(PC) mode.\n\nThe light curve can be modelled with a series of power-law decays. The\ninitial decay index is alpha=5.3 (+2.7, -0.8). At T+249 s the decay\nflattens to an alpha of -0.2 (+0.7, -0.6) before breaking again at\nT+1406 s to a final decay with index alpha=1.20 (+0.32, -0.25).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.30 (+0.30, -0.27). The\nbest-fitting absorption column is 2.4 (+1.1, -0.9) x 10^21 cm^-2, in\nexcess of the Galactic value of 6.6 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 3.1 x 10^-11 (5.1 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 2.4 (+1.1, -0.9) x 10^21 cm^-2\nGalactic foreground: 6.6 x 10^20 cm^-2\nExcess significance: 3.1 sigma\nPhoton index:\t 2.30 (+0.30, -0.27)\n\nIf the light curve continues to decay with a power-law decay index of\n1.20, the count rate at T+24 hours will be 2.8 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.7 x\n10^-14 (1.4 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/01222955.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36182.",
"published": "2024-04-19T15:20:49.050327Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-19T15:20:49.050349Z",
"modified": "2024-04-19T15:20:49.057194Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5745,
"topic": "gcn.circular",
"uuid": "2da07ebd-4034-4d34-bc44-3f01ba3d30dd",
"title": "GRB 240109B: 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": "24/01/09 21:41:29 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35511"
},
"title": "GCN CIRCULAR",
"number": "35511",
"subject": "GRB 240109B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 21:30:52 UT on 9 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240109B (trigger 726528657.301666 / 240109896).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 241.5, Dec = -44.3 (J2000 degrees, equivalent to J2000 16h 06m, -44d 17'), with a statistical uncertainty of 12.2 degrees.\n\nThe angle from the Fermi LAT boresight is 91.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240109896/quicklook/glg_skymap_all_bn240109896.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/2024/bn240109896/quicklook/glg_healpix_all_bn240109896.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240109896/quicklook/glg_lc_medres34_bn240109896.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35511.",
"published": "2024-01-09T21:41:40.849748Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T21:41:40.849766Z",
"modified": "2024-01-09T21:41:40.856744Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5746,
"topic": "gcn.circular",
"uuid": "46b29374-1803-4856-8072-65693b0cc0bd",
"title": "IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "24/01/09 21:47:25 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35512"
},
"title": "GCN CIRCULAR",
"number": "35512",
"subject": "IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-240105A (https://gcn.nasa.gov/circulars/35498) in a time range of 1000 seconds centered on the alert event time (2024-01-05 12:19:22.57 UTC to 2024-01-05 12:36:02.57 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-240105A. 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-240105A is 1.3e-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 1e+05 GeV.\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2024-01-04 12:27:42.57 UTC to 2024-01-06 12:27:42.57 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-240105A ranges from 1.5e-01 to 1.6e-01 GeV cm^-2 in a 2 day time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35512.",
"published": "2024-01-09T21:47:36.399483Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T21:47:36.399506Z",
"modified": "2024-01-09T21:47:36.404800Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5747,
"topic": "gcn.circular",
"uuid": "4e3891b7-c7f2-4e09-8bbc-ac752e0ce68a",
"title": "GRB 240106A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/09 22:03:58 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35513"
},
"title": "GCN CIRCULAR",
"number": "35513",
"subject": "GRB 240106A: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: \n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240106A, which was also detected by Fermi/GBM, GRBAlpha, CALET/CGBM, and INTEGRAL/SPI-ACS (GCN #35490, #35497). \n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-06 00:34:17.784 with a duration of 146.4 s and a total significance of over 97 sigma. \n \nThe light curve comprises a complex multi-peaked structure with the brightest interval from T0+127.5s to T0+146.4s. Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over the brightest interval results in a photon index dN/dE~E^x of x=1.1 and a cutoff energy (\"Epeak\") of 281 keV. The modeled 10-10000 keV fluence for the brightest interval is 1e-05 erg/cm^2.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35513.",
"published": "2024-01-09T22:04:08.045462Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T22:04:08.045476Z",
"modified": "2024-01-09T22:04:08.050733Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5748,
"topic": "gcn.circular",
"uuid": "deab0f5a-fe37-4bd1-a81e-af820f4106f8",
"title": "GRB 240106B: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/09 22:04:39 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35514"
},
"title": "GCN CIRCULAR",
"number": "35514",
"subject": "GRB 240106B: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: \n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240106B, which was also detected by Fermi/GBM (GCN #35492). \n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-06 06:21:18.624 with a duration of 6.1 s and a total significance of about 17.5 sigma. The light curve comprises a single peak.\n \nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=0.9 and a cutoff energy (\"Epeak\") of 330 keV. The modeled 10-10000 keV fluence is 1.2e-06 erg/cm^2.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35514.",
"published": "2024-01-09T22:04:47.237733Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T22:04:47.237747Z",
"modified": "2024-01-09T22:04:47.242698Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6690,
"topic": "gcn.circular",
"uuid": "81560be3-37a1-40d9-b344-2abd1bcb0b42",
"title": "GRB 240419A: REM NIR afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Matteo Ferro at INAF-OAB <matteo.ferro@inaf.it>",
"data": {
"date": "24/04/19 15:36:10 GMT",
"from": "Matteo Ferro at INAF-OAB <matteo.ferro@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36183"
},
"title": "GCN CIRCULAR",
"number": "36183",
"subject": "GRB 240419A: REM NIR afterglow detection"
},
"message_text": "M. Ferro, Y.-D. Hu, P. DâAvanzo, R. Brivio, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed for the field of GRB 240419A (Siegel et al., GCN 36169) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2024 April 19 at 01:49:38 UT (i.e. 1.6 minutes after the event), and lasting for about 3 hours.\nFrom preliminary photometry we detect the NIR afterglow at a position consistent with the optical afterglow position (Schneider et al., GCN 36175), at the following AB magnitude in the H band:\n\nH = 15.7 +- 0.1 (calibrated against 2MASS catalogue)\nat a mid time of t-t0 ~ 4 minutes after the GRB trigger.\n\nThe afterglow is not detected in our optical observations, at the following AB magnitude limit in the r band:\n\nr > 19.2 (calibrated against SkyMapper catalogue)\nat a mid time of t-t0 ~ 6.3 minutes after the GRB trigger.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36183.",
"published": "2024-04-19T15:36:24.563609Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-19T15:36:24.563636Z",
"modified": "2024-04-19T15:36:24.570095Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5749,
"topic": "gcn.circular",
"uuid": "ce5d5487-ab6c-44b6-8c1f-a3a38af18c34",
"title": "GRB 231214A: ATCA Radio Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "agul8829@uni.sydney.edu.au",
"data": {
"date": "24/01/09 22:18:17 GMT",
"from": "agul8829@uni.sydney.edu.au",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35515"
},
"title": "GCN CIRCULAR",
"number": "35515",
"subject": "GRB 231214A: ATCA Radio Upper Limits"
},
"message_text": "A. Gulati (USyd), G. E. Anderson (Curtin), J. K. Leung (UofT/HUJI), S. D. Ryder (Macquarie), A. J. van der Horst (GWU), S. Chastain (UNM), and L. Rhodes (Oxford) on behalf of the ATCA PanRadio GRB collaboration\n\nWe observed long GRB 231214A (Fermi GBM Collaboration, GCN 35334; R. Brivio et al., GCN 35335) as part of the The Australia Telescope Compact Array (ATCA) \"PanRadio GRB\" Large Project C3542 (PI: G. Anderson) at 5.5, 9, 16.7, 21.2, 33 and 35 GHz on 2023-12-16 and at 5.5 and 9 GHz on 2023-12-21 UT.\n\nNo radio sources were detected near the Swift/XRT enhanced position (J. P. Osborne et al., GCN 35350)in either observation epoch. The 3-sigma upper limits for the 9 GHz observations are 73 and 81 uJy respectively.\n\nWe thank the CSIRO Space and Astronomy staff for supporting these observations.\nWe acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35515.",
"published": "2024-01-09T22:18:28.520175Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-09T22:18:28.520191Z",
"modified": "2024-01-09T22:18:28.527715Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5750,
"topic": "gcn.circular",
"uuid": "950c89f9-9cc3-4927-bb33-39110d03b0b2",
"title": "GRB 240108A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/10 04:02:03 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35516"
},
"title": "GCN CIRCULAR",
"number": "35516",
"subject": "GRB 240108A: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:\n\nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240108A, which was also a weak detection by INTEGRAL IBAS (Trigger 10461).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-08 19:18:29.488 with a duration of 10.2 s and a total significance of about 16.9 sigma. The light curve comprises a single peak.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.4 and a cutoff energy (\"Epeak\") of 376 keV. The modeled 10-10000 keV fluence is 1.6e-06 erg/cm^2.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35516.",
"published": "2024-01-10T04:02:17.434574Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-10T04:02:17.434598Z",
"modified": "2024-01-10T04:02:17.448682Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5751,
"topic": "gcn.circular",
"uuid": "d17cc2b2-7ba2-411c-bb2e-d9357603f7e7",
"title": "Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region",
"submitter": "Hop gcn.circular",
"authors": "Sara Buson at Univ. of Wurzburg <sara.buson@gmail.com>",
"data": {
"date": "24/01/10 15:47:25 GMT",
"from": "Sara Buson at Univ. of Wurzburg <sara.buson@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35517"
},
"title": "GCN CIRCULAR",
"number": "35517",
"subject": "Fermi-LAT detection of increased gamma-ray activity of blazar PKS 0446+11, located inside the IceCube-240105A error region"
},
"message_text": "J. Sinapius (DESY), S. Garrappa (Weizmann Institute of Science), S. Buson (Univ. of Wuerzburg), C. Bartolini (INFN Bari) and L. Pfeiffer (Univ. of Wuerzburg) on behalf of the Fermi-LAT collaboration\n\nWe report an analysis of observations of the vicinity of the IC240105A high-energy neutrino event (GCN 35498) 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 2024-01-05 at 12:27:42.57 UT (T0) with J2000 coordinates RA = 72.69 (+1.92, -1.85) deg, Decl. = +11.42 (+0.50, -0.44) deg (90% PSF containment). There are two known gamma-ray sources (>100 MeV; 4FGL-DR4, The Fermi-LAT collaboration 2023, arXiv:2307.12546) located within the 90% IC240105A localization region. These are 4FGL J0449.1+1121, associated with the FSRQ PKS 0446+11 at a redshift of 2.15 (Shaw et al. 2012, ApJ, 748, 49) and the blazar of uncertain type 4FGL J0458.0+1152 (a.k.a. NVSS J045804+115142). These sources are located at 0.4 deg and 1.9 deg from the neutrino best-fit position, respectively. Based on a preliminary analysis of the LAT data over the timescales of 1-day prior to T0, these objects are not significantly detected (> 5 sigma).\n\nIn a preliminary analysis of LAT data integrated over 1 month before T0, only 4FGL J0449.1+1121 is significantly detected (> 5 sigma). This gamma-ray source showed significantly increased activity in November 2023 (ATel #16332), where its flux reached 18 times the cataloged average flux reported in 4FGL-DR4. A preliminary light curve of the object is available at https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J0449.1+1121. \nPreliminary analysis indicates that 4FGL J0449.1+1121 has been brighter than its average state also in the weeks before T0, and likely in the descending phase of the flare reported on November 2023. In a preliminary analysis of LAT data integrated over one month prior T0, the observed flux (E>100 MeV) is (1.9 +/- 0.3) e-7 photons cm^-2 s^-1 (statistical uncertainty only). This is more than 3 times greater than the average flux reported in the 4FGL-DR4. We encourage multiwavelength observations of this source. \n\nWe searched for intermediate (days to years) timescale emission from a new gamma-ray source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC240105A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240105A best-fit position, the >100 MeV flux upper limit (95% confidence) is <5.9e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2023-01-05 UTC), and < 2.8e-8 (<2.8 e-7) 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 person is J. Sinapius (jonas.sinapius at desy.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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35517.",
"published": "2024-01-10T15:47:39.553904Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-10T15:47:39.553924Z",
"modified": "2024-01-10T15:47:39.562752Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6552,
"topic": "gcn.circular",
"uuid": "6b2454f6-7f9e-490a-a306-348b3635521a",
"title": "GRB 240414A : MITSuME Akeno optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Masafumi Niwano at Tokyo Institute of Technology <niwano@hp.phys.titech.ac.jp>",
"data": {
"date": "24/04/14 12:00:04 GMT",
"from": "Masafumi Niwano at Tokyo Institute of Technology <niwano@hp.phys.titech.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36088"
},
"title": "GCN CIRCULAR",
"number": "36088",
"subject": "GRB 240414A : MITSuME Akeno optical upper limits"
},
"message_text": "M. Niwano, M. Sasada, I. Takahashi, N. Higuchi, S. Hayatsu, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 240414A (Caputo et al., GCN 36083) with the optical three-color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50-cm telescope Akeno.\n\nThe observation started at 2024-04-14 09:46:06 UT (7.4 hrs after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the enhanced Swift/XRT error region (Caputo et al., GCN 36083), despite the detection report of Schneider et al., (GCN 36084). We obtained the 5-sigma limits of the stacked images as follows.\n\nT0+[hrs] | MID-UT | T-EXP[sec] | 5-sigma limits\n------------------------------------------------------------------------------------------------\n7.7 | 2024-02-14 10:27:15.26 | 900 | g'>17.7, Rc>18.7, Ic>18.2\n------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the trigger\nT-EXP: Total Exposure time\n\nWe used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ; https://github.com/MNiwano/Eclaire).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36088.",
"published": "2024-04-14T12:00:19.412626Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T12:00:19.412642Z",
"modified": "2024-04-14T12:00:19.419293Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5756,
"topic": "gcn.circular",
"uuid": "0e04d9fa-feb4-49e9-9bfd-b629cc729a31",
"title": "GRB 240110A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/11 15:28:45 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35518"
},
"title": "GCN CIRCULAR",
"number": "35518",
"subject": "GRB 240110A: AstroSat CZTI detection"
},
"message_text": "J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240110A which was also detected by GECAM (Trigger Num. 257), and INTEGRAL-SPIACS (Trigger Num. 10463).\n\nThe source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-10 14:53:30.07 UTC. The measured peak count rate associated with the burst is 348 (+65, -56) counts/s above the background in the combined data of all quadrants, with a total of 3083 (+366, -468) counts. The local mean background count rate was 1334 (+6, -5) counts/s. We measure a T90 of 16 (+4, -2) s from the cumulative Veto light curve.\n\nThe source was also detected in the CZT detectors in the 20-200 keV energy range but we cannot make quantitative inferences due to data quality issues.\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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35518.",
"published": "2024-01-11T15:29:02.272678Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-11T15:29:02.272692Z",
"modified": "2024-01-11T15:29:02.281046Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5759,
"topic": "gcn.circular",
"uuid": "b0d7fb86-d21f-4da3-85e5-2b4b727b7f42",
"title": "GRB 240109A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"data": {
"date": "24/01/11 20:28:52 GMT",
"from": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35519"
},
"title": "GCN CIRCULAR",
"number": "35519",
"subject": "GRB 240109A: Fermi GBM Observation"
},
"message_text": "O.J. Roberts (USRA/NASA-MSFC) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 04:01:35.21 UT on 09 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240109A (trigger 726465700/240109168).\nwhich was also detected by Swift-BAT (S. Dichiara et al. 2024, GCN 35501).\nThe Fermi GBM on-ground Localization is consistent with the Swift-BAT position.\n\nThe angle from the Fermi LAT boresight is 79 degrees using the Swift-BAT position.\n\nThe GBM light curve consists of a single peak with a duration (T90)\nof about 0.26 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.12 to T0+0.12 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.0 +/- 0.3 and the cutoff energy,\nparameterized as Epeak, is 305 +/- 179 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.6 +/- 0.4)E-07 erg/cm^2. The 0.064-sec peak photon flux measured\nstarting from T0-0.064 s in the 10-1000 keV band is 6 +/- 1 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35519.",
"published": "2024-01-11T20:29:07.981071Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-11T20:29:07.981086Z",
"modified": "2024-01-11T20:29:07.989435Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5768,
"topic": "gcn.circular",
"uuid": "31d01a2a-11f7-4348-b7e4-ffb0b10426a5",
"title": "GRB 240112A: GECAM detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Chenwei Wang at IHEP <cwwang@ihep.ac.cn>",
"data": {
"date": "24/01/12 07:03:01 GMT",
"from": "Chenwei Wang at IHEP <cwwang@ihep.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35520"
},
"title": "GCN CIRCULAR",
"number": "35520",
"subject": "GRB 240112A: GECAM detection of a burst"
},
"message_text": "Chen-Wei Wang, Shao-Lin Xiong report on behalf of the GECAM team:\nGECAM-B was triggered in-flight by a bright burst, tentatively named as GRB 240112A (see below),at 2024-01-12T05:41:25.850 UTC (denoted as T0).\n\nGECAM-B localized this burst to the following position (J2000):\nRa: 290.4 deg\nDec: 18.4 deg\nErr: 3.6 deg (1-sigma, statistical only)\nWe note that, although this in-flight location is very preliminary, it is generally consistent with SGR J1935+2154 within the error, therefore we suggest that it could be possibly from this magnetar. However, we cannot exclude the possibility of other origins at this moment.\n\nAccording to the realtime alert data of GECAM-B, this burst mainly consists of two pulses\nwith a duration of about 3 s. The time-averaged spectrum from T0-0.2 to T0+3.8 s\ncould be adequately fit by a power law with high energy exponential cutoff function\nwith a fluence of about 5E-6 erg/cm^2 in 20-1000 keV.\n\nThe GECAM light curve could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/240112_lc.png\n\nWe note that these results are based on realtime alert data and thus very preliminary.\nRefined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor\n(GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B)\nlaunched in Dec. 2020. As the third member of GECAM constellation,\nGECAM-C was launched onboard SATech-01 experimental satellite in July 2022.\nGECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35520.",
"published": "2024-01-12T07:03:16.454058Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T07:03:16.454074Z",
"modified": "2024-01-12T07:03:16.462566Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6553,
"topic": "gcn.circular",
"uuid": "09e14282-2f0e-4264-a193-51e0cff6e2b0",
"title": "Fermi-LAT gamma-ray observations of IceCube-240412A",
"submitter": "Hop gcn.circular",
"authors": "chiara.bartolini-1@unitn.it",
"data": {
"date": "24/04/14 13:02:15 GMT",
"from": "chiara.bartolini-1@unitn.it",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36089"
},
"title": "GCN CIRCULAR",
"number": "36089",
"subject": "Fermi-LAT gamma-ray observations of IceCube-240412A"
},
"message_text": "C. Bartolini (INFN Bari), S. Garrappa (Weizmann Institute of Science), S. Buson (DESY; Univ. of Wuerzburg), L. Pfeiffer (Univ. of Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the high-energy IC240412A neutrino event (GCN 36070) 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 2024-04-12 at 05:33:46.89 UT (T0) with J2000 position RA = 102.44 (+1.09, -0.67) deg, Decl. = +6.35 (+0.60, -0.46) deg (90% PSF containment). There are no cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources located within the 90% IC240412A localization region.\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 IC240412A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240412A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 7.99e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-04-12 UTC), and < 6.05e-9 (< 1.67e-7) 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 this observation the Fermi-LAT contact person is C. Bartolini (chiara.bartolini at ba.infn.it).\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36089.",
"published": "2024-04-14T13:02:29.370359Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T13:02:29.370389Z",
"modified": "2024-04-14T13:02:29.377022Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5772,
"topic": "gcn.circular",
"uuid": "5f062802-3ab6-40d5-bd81-0c0456c027ff",
"title": "GRB 240112B: 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": "24/01/12 13:09:48 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35521"
},
"title": "GCN CIRCULAR",
"number": "35521",
"subject": "GRB 240112B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 12:59:25 UT on 12 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240112B (trigger 726757170.415726 / 240112541).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 8.2, Dec = -65.9 (J2000 degrees, equivalent to J2000 00h 32m, -65d 54'), with a statistical uncertainty of 3.4 degrees.\n\nThe angle from the Fermi LAT boresight is 150.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112541/quicklook/glg_skymap_all_bn240112541.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/2024/bn240112541/quicklook/glg_healpix_all_bn240112541.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112541/quicklook/glg_lc_medres34_bn240112541.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35521.",
"published": "2024-01-12T13:10:01.437672Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T13:10:01.437686Z",
"modified": "2024-01-12T13:10:01.442943Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5774,
"topic": "gcn.circular",
"uuid": "9b0f529e-2285-48ab-84b0-044936f3d72c",
"title": "GRB 240112C: Swift detection of a burst with an optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "24/01/12 17:51:21 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35522"
},
"title": "GCN CIRCULAR",
"number": "35522",
"subject": "GRB 240112C: Swift detection of a burst with an optical counterpart"
},
"message_text": "\nR. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU),\nS. Laha (GSFC/UMBC), F. E. Marshall (NASA/GSFC),\nK. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and\nM. A. Williams (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 17:37:24 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240112C (trigger\u001208389). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 270.644, +24.487 which is\n RA(J2000) = 18h 02m 35s\n Dec(J2000) = +24d 29' 12\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). Due to a telemetry gap, the BAT lightcurve\nis not immediately available.\n\nThe XRT began observing the field at 17:39:18.9 UT, 114.0 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 270.64225, 24.48830 which is equivalent\nto:\n RA(J2000) = 18h 02m 34.14s\n Dec(J2000) = +24d 29' 17.9\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). This\nlocation is 7.4 arcseconds from the BAT onboard position, within the\nBAT error circle. This position may be improved as more data are\nreceived; the latest position is available at\nhttps://www.swift.ac.uk/sper. We cannot determine whether the source\nis fading at the present time. No spectrum from the promptly downlinked\nevent data is yet available to determine the column density.\n\nUVOT took a finding chart exposure of 115 seconds with the White filter\nstarting 120 seconds after the BAT trigger. There is a candidate afterglow in\nthe rapidly available 2.7'x2.7' sub-image at\n RA(J2000) =\t18:02:34.59 = 270.64414\n DEC(J2000) = +24:29:21.2 = 24.48923\nwith a 90%-confidence error radius of about 0.75 arc sec. This position is 7.4\narc sec. from the center of the XRT error circle. The estimated magnitude is\n16.73 with a 1-sigma error of about 0.14. No correction has been made for the\nexpected extinction corresponding to E(B-V) of 0.108.\n\nBurst Advocate for this burst is R. A. J. Eyles-Ferris (raje1 AT leicester.ac.uk).\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\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35522.",
"published": "2024-01-12T17:51:36.240672Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T17:51:36.240692Z",
"modified": "2024-01-12T17:51:36.249167Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5779,
"topic": "gcn.circular",
"uuid": "aca8c82b-6831-4ea9-b96b-066fdc274286",
"title": "GRB 240112D: 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": "24/01/12 22:06:48 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35527"
},
"title": "GCN CIRCULAR",
"number": "35527",
"subject": "GRB 240112D: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 21:56:04 UT on 12 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240112D (trigger 726789369.452754 / 240112914).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 148.5, Dec = -79.4 (J2000 degrees, equivalent to J2000 09h 54m, -79d 24'), with a statistical uncertainty of 11.1 degrees.\n\nThe angle from the Fermi LAT boresight is 26.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112914/quicklook/glg_skymap_all_bn240112914.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/2024/bn240112914/quicklook/glg_healpix_all_bn240112914.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112914/quicklook/glg_lc_medres34_bn240112914.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35527.",
"published": "2024-01-12T22:06:55.637167Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T22:06:55.637188Z",
"modified": "2024-01-12T22:06:55.642570Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5780,
"topic": "gcn.circular",
"uuid": "62d1348f-3e00-4b56-b4be-6da2334e30c0",
"title": "Fermi GRB 240112D: 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": "24/01/12 22:31:00 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35528"
},
"title": "GCN CIRCULAR",
"number": "35528",
"subject": "Fermi GRB 240112D: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240112D ( Fermi GBM team, GCN 35527) errorbox 42 sec after notice time and 78 sec after trigger time at 2024-01-12 21:57:23 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 52 deg. The sun altitude is -35.0 deg.\n\nThe galactic latitude b = -20 deg., longitude l = 295 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#54610\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 89 | 2024-01-12 21:57:23 | MASTER-SAAO | (10h 37m 28.51s , -77d 28m 52.6s) | C | 20 | 18.4 |\n 114 | 2024-01-12 21:57:23 | MASTER-SAAO | (10h 37m 28.45s , -77d 28m 52.6s) | C | 70 | 19.1 | Coadd\n 89 | 2024-01-12 21:57:23 | MASTER-SAAO | (10h 49m 36.14s , -77d 40m 50.9s) | C | 20 | 18.6 |\n 114 | 2024-01-12 21:57:23 | MASTER-SAAO | (10h 49m 36.14s , -77d 40m 50.8s) | C | 70 | 19.5 | Coadd\n 128 | 2024-01-12 21:58:02 | MASTER-SAAO | (10h 37m 28.13s , -77d 28m 52.8s) | C | 20 | 18.4 |\n 128 | 2024-01-12 21:58:02 | MASTER-SAAO | (10h 49m 35.78s , -77d 40m 50.9s) | C | 20 | 18.6 |\n 172 | 2024-01-12 21:58:41 | MASTER-SAAO | (10h 37m 27.74s , -77d 28m 52.7s) | C | 30 | 18.8 |\n 172 | 2024-01-12 21:58:41 | MASTER-SAAO | (10h 49m 35.40s , -77d 40m 51.0s) | C | 30 | 18.9 |\n 227 | 2024-01-12 21:59:31 | MASTER-SAAO | (10h 37m 27.15s , -77d 28m 53.1s) | C | 40 | 18.9 |\n 282 | 2024-01-12 21:59:31 | MASTER-SAAO | (10h 37m 27.16s , -77d 28m 53.1s) | C | 150 | 19.7 | Coadd\n 227 | 2024-01-12 21:59:31 | MASTER-SAAO | (10h 49m 34.89s , -77d 40m 51.0s) | C | 40 | 19.2 |\n 282 | 2024-01-12 21:59:31 | MASTER-SAAO | (10h 49m 34.90s , -77d 40m 51.1s) | C | 150 | 19.8 | Coadd\n 303 | 2024-01-12 22:00:42 | MASTER-SAAO | (10h 37m 26.55s , -77d 28m 53.5s) | C | 50 | 18.9 |\n 303 | 2024-01-12 22:00:42 | MASTER-SAAO | (10h 49m 34.21s , -77d 40m 51.2s) | C | 50 | 19.0 |\n 377 | 2024-01-12 22:01:51 | MASTER-SAAO | (10h 37m 26.05s , -77d 28m 53.8s) | C | 60 | 19.2 |\n 377 | 2024-01-12 22:01:51 | MASTER-SAAO | (10h 49m 33.67s , -77d 40m 51.6s) | C | 60 | 19.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35528.",
"published": "2024-01-12T22:31:11.016019Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T22:31:11.016035Z",
"modified": "2024-01-12T22:31:11.023403Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5775,
"topic": "gcn.circular",
"uuid": "093ef088-daf3-4a84-b044-65378fdcedbb",
"title": "GRB 240109A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Sibasish Laha at GSFC <sibasish.laha@nasa.gov>",
"data": {
"date": "24/01/12 18:37:07 GMT",
"from": "Sibasish Laha at GSFC <sibasish.laha@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35523"
},
"title": "GCN CIRCULAR",
"number": "35523",
"subject": "GRB 240109A: Swift-BAT refined analysis"
},
"message_text": "D. M. Palmer (LANL), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), T. Parsotan (GSFC),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-61 to T+242 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 240109A (trigger #1207446)\n(Dichiara et al., GCN Circ. 35501). The BAT ground-calculated position is\nRA, Dec = 301.330, 16.566 deg which is\n RA(J2000) = 20h 05m 19.1s\n Dec(J2000) = +16d 33' 58.3\"\nwith an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 67%.\n\nThe BAT light curve shows a single peak with a duration ~0.5 sec.\nT90 (15-350 keV) is 0.16 +- 0.06 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.04 to T+0.15 sec is better fit by a blackbody.\nA simple power-law fit shows a photon index of 2.75 +-0.35 with a poor statistics (reduced chi2 of 1.9).\nInstead, the black body fit shows the temperature of 12.2 +-1.3 keV\nwith a reasonable statistics (reduced chi2 of 1.2). So, the burst\nprefers a soft spectrum. The fluence in the 15-150 keV band is 1.2 +- 0.4 x 10^-08 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.44 sec in the 15-150 keV band\nis 0.7 +- 0.2 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/1207446/BA/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35523.",
"published": "2024-01-12T18:37:18.673194Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T18:37:18.673215Z",
"modified": "2024-01-12T18:37:18.678834Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5776,
"topic": "gcn.circular",
"uuid": "349868b8-be3d-4445-bd22-59f7a4d25d78",
"title": "Fermi GRB 240112B: 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": "24/01/12 19:46:24 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35524"
},
"title": "GCN CIRCULAR",
"number": "35524",
"subject": "Fermi GRB 240112B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240112B ( Fermi GBM team, GCN 35521) errorbox 23429 sec after notice time and 23473 sec after trigger time at 2024-01-12 19:30:39 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 47 deg. The sun altitude is -18.7 deg.\n\nThe galactic latitude b = -51 deg., longitude l = 306 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#54342\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 23504 | 2024-01-12 19:30:39 | MASTER-SAAO | (00h 36m 58.81s , -65d 30m 24.0s) | C | 60 | 19.2 |\n 23504 | 2024-01-12 19:30:39 | MASTER-SAAO | (00h 30m 47.39s , -65d 17m 35.0s) | C | 60 | 18.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35524.",
"published": "2024-01-12T19:46:35.333585Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T19:46:35.333603Z",
"modified": "2024-01-12T19:46:35.340698Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5777,
"topic": "gcn.circular",
"uuid": "d1270a35-0c78-4bf8-a2a2-ce6cf3c36eae",
"title": "Swift GRB 240112C: 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": "24/01/12 20:15:12 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35525"
},
"title": "GCN CIRCULAR",
"number": "35525",
"subject": "Swift GRB 240112C: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 240112C ( R. A. J. Eyles-Ferris et al., GCN 35522) errorbox 8981 sec after notice time and 9002 sec after trigger time at 2024-01-12 20:07:27 UT, with upper limit up to 15.4 mag. The observations began at zenith distance = 85 deg. The sun altitude is -45.5 deg.\n\nThe galactic latitude b = 21 deg., longitude l = 51 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#54458\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 9040 | MASTER-Tunka | C | 75 | 12.4 |\n 9124 | MASTER-Tunka | C | 70 | 15.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35525.",
"published": "2024-01-12T20:15:21.931693Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T20:15:21.931713Z",
"modified": "2024-01-12T20:15:21.939564Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5778,
"topic": "gcn.circular",
"uuid": "b02e7bc1-9330-47b5-a455-7c228cf73cfa",
"title": "Fermi trigger No 726774492: 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": "24/01/12 22:02:10 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35526"
},
"title": "GCN CIRCULAR",
"number": "35526",
"subject": "Fermi trigger No 726774492: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240112.74 (trigger No 726774492,14h 06m 16.08s , -25d 12m 00.0s, R\u0012.97) errorbox 9695 sec after notice time and 9708 sec after trigger time at 2024-01-12 20:29:55 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 77 deg. The sun altitude is -42.3 deg.\n\nThe galactic latitude b = 34 deg., longitude l = 324 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#54490\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 9738 | 2024-01-12 20:29:55 | MASTER-Tunka | (13h 29m 02.39s , -17d 30m 20.3s) | C | 60 | 17.7 |\n 9812 | 2024-01-12 20:31:09 | MASTER-Tunka | (13h 20m 56.30s , -15d 34m 04.6s) | C | 60 | 17.9 |\n 9891 | 2024-01-12 20:32:28 | MASTER-Tunka | (13h 45m 03.06s , -17d 31m 16.0s) | C | 60 | 17.5 |\n 9964 | 2024-01-12 20:33:41 | MASTER-Tunka | (13h 36m 50.38s , -15d 35m 10.3s) | C | 60 | 17.7 |\n 10043 | 2024-01-12 20:35:00 | MASTER-Tunka | (13h 52m 36.53s , -15d 36m 52.4s) | C | 60 | 17.5 |\n 10717 | 2024-01-12 20:46:14 | MASTER-Tunka | (13h 15m 49.47s , -21d 15m 22.7s) | C | 60 | 17.7 |\n 10794 | 2024-01-12 20:47:31 | MASTER-Tunka | (13h 21m 03.93s , -15d 34m 19.5s) | C | 60 | 18.1 |\n 10867 | 2024-01-12 20:48:44 | MASTER-Tunka | (13h 29m 17.14s , -15d 35m 46.2s) | C | 60 | 18.0 |\n 10942 | 2024-01-12 20:49:59 | MASTER-Tunka | (13h 36m 47.99s , -15d 36m 08.6s) | C | 60 | 17.4 |\n 11021 | 2024-01-12 20:51:18 | MASTER-Tunka | (13h 38m 13.98s , -19d 23m 11.0s) | C | 60 | 17.9 |\n 11096 | 2024-01-12 20:52:33 | MASTER-Tunka | (14h 00m 58.36s , -17d 29m 53.9s) | C | 60 | 17.7 |\n 11175 | 2024-01-12 20:53:52 | MASTER-Tunka | (13h 32m 04.77s , -21d 16m 38.3s) | C | 60 | 17.8 |\n 11251 | 2024-01-12 20:55:08 | MASTER-Tunka | (14h 00m 53.58s , -13d 43m 30.6s) | C | 60 | 18.0 |\n 11609 | 2024-01-12 21:01:06 | MASTER-Tunka | (14h 08m 23.44s , -15d 37m 36.4s) | C | 60 | 17.6 |\n 11685 | 2024-01-12 21:02:22 | MASTER-Tunka | (13h 29m 01.82s , -17d 27m 06.7s) | C | 60 | 17.6 |\n 11905 | 2024-01-12 21:06:02 | MASTER-Tunka | (13h 21m 00.47s , -15d 34m 21.8s) | C | 60 | 18.0 |\n 11977 | 2024-01-12 21:07:14 | MASTER-Tunka | (13h 29m 22.68s , -15d 33m 04.3s) | C | 60 | 17.9 |\n 12056 | 2024-01-12 21:08:33 | MASTER-Tunka | (13h 36m 51.92s , -15d 34m 16.9s) | C | 60 | 17.8 |\n 12127 | 2024-01-12 21:09:44 | MASTER-Tunka | (13h 45m 04.70s , -15d 35m 43.2s) | C | 60 | 17.7 |\n 12199 | 2024-01-12 21:10:56 | MASTER-Tunka | (13h 52m 39.46s , -15d 35m 57.4s) | C | 60 | 17.7 |\n 12350 | 2024-01-12 21:13:27 | MASTER-Tunka | (14h 09m 14.30s , -13d 42m 56.4s) | C | 60 | 17.7 |\n 12424 | 2024-01-12 21:14:41 | MASTER-Tunka | (13h 54m 19.79s , -19d 23m 32.3s) | C | 60 | 16.7 |\n 12502 | 2024-01-12 21:15:59 | MASTER-Tunka | (13h 48m 30.29s , -21d 16m 35.3s) | C | 60 | 16.6 |\n 12576 | 2024-01-12 21:17:13 | MASTER-Tunka | (14h 10m 28.00s , -19d 23m 04.5s) | C | 60 | 16.2 |\n 12655 | 2024-01-12 21:18:32 | MASTER-Tunka | (14h 00m 52.69s , -15d 35m 20.6s) | C | 60 | 16.1 |\n 12730 | 2024-01-12 21:19:47 | MASTER-Tunka | (14h 16m 57.87s , -17d 30m 19.9s) | C | 60 | 16.3 |\n 13267 | 2024-01-12 21:28:44 | MASTER-Tunka | (14h 00m 56.67s , -13d 40m 20.6s) | C | 60 | 17.7 |\n 13338 | 2024-01-12 21:29:55 | MASTER-Tunka | (14h 09m 10.99s , -13d 42m 04.5s) | C | 60 | 17.7 |\n 13417 | 2024-01-12 21:31:14 | MASTER-Tunka | (14h 08m 20.32s , -15d 34m 16.1s) | C | 60 | 17.8 |\n 13500 | 2024-01-12 21:32:37 | MASTER-Tunka | (14h 04m 47.44s , -21d 17m 27.6s) | C | 60 | 17.0 |\n 13574 | 2024-01-12 21:33:51 | MASTER-Tunka | (14h 16m 39.83s , -15d 34m 42.6s) | C | 60 | 17.9 |\n 13652 | 2024-01-12 21:35:09 | MASTER-Tunka | (13h 43m 24.47s , -23d 10m 15.4s) | C | 60 | 16.8 |\n 13726 | 2024-01-12 21:36:23 | MASTER-Tunka | (13h 26m 45.69s , -23d 08m 17.3s) | C | 60 | 17.5 |\n 13799 | 2024-01-12 21:37:36 | MASTER-Tunka | (13h 22m 09.82s , -25d 02m 57.2s) | C | 60 | 17.0 |\n 13876 | 2024-01-12 21:38:53 | MASTER-Tunka | (14h 24m 11.59s , -15d 36m 28.9s) | C | 60 | 18.0 |\n 14027 | 2024-01-12 21:41:24 | MASTER-Tunka | (13h 47m 13.63s , -11d 45m 27.0s) | C | 60 | 18.5 |\n 14101 | 2024-01-12 21:42:38 | MASTER-Tunka | (14h 10m 06.68s , -11d 47m 22.4s) | C | 60 | 18.6 |\n 14172 | 2024-01-12 21:43:49 | MASTER-Tunka | (14h 18m 15.33s , -11d 46m 48.3s) | C | 60 | 18.5 |\n 14361 | 2024-01-12 21:46:58 | MASTER-Tunka | (13h 59m 57.39s , -23d 09m 49.5s) | C | 60 | 17.5 |\n 14440 | 2024-01-12 21:48:17 | MASTER-Tunka | (13h 54m 30.09s , -11d 44m 34.2s) | C | 60 | 18.6 |\n 14511 | 2024-01-12 21:49:28 | MASTER-Tunka | (14h 02m 46.62s , -11d 46m 03.1s) | C | 60 | 18.6 |\n 14587 | 2024-01-12 21:50:44 | MASTER-Tunka | (14h 16m 55.83s , -17d 28m 16.1s) | C | 60 | 18.4 |\n 14665 | 2024-01-12 21:52:02 | MASTER-Tunka | (13h 38m 58.90s , -25d 03m 15.8s) | C | 60 | 17.2 |\n 14742 | 2024-01-12 21:53:19 | MASTER-Tunka | (13h 45m 14.49s , -13d 38m 43.3s) | C | 60 | 18.6 |\n 14813 | 2024-01-12 21:54:30 | MASTER-Tunka | (13h 53m 29.56s , -13d 38m 11.3s) | C | 60 | 18.6 |\n 14887 | 2024-01-12 21:55:44 | MASTER-Tunka | (14h 24m 08.73s , -15d 36m 06.3s) | C | 60 | 18.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35526.",
"published": "2024-01-12T22:02:22.289986Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-12T22:02:22.290005Z",
"modified": "2024-01-12T22:02:22.297314Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5781,
"topic": "gcn.circular",
"uuid": "4e77dabf-2bcb-4ed7-92d8-cd36604006ad",
"title": "GRB 240112E: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"data": {
"date": "24/01/13 00:04:22 GMT",
"from": "Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35529"
},
"title": "GCN CIRCULAR",
"number": "35529",
"subject": "GRB 240112E: Fermi GBM Final Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\n\"At 17:48:07.46 UT on 12 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240112E (trigger 726774492/240112742).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 217.7, Dec = -32.6 (J2000 degrees, equivalent to J2000 14h 31m, -32d 35'),\nwith a statistical uncertainty of 3.4 degrees.\n\nThe angle from the Fermi LAT boresight is 125 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112742/quicklook/glg_skymap_all_bn240112742.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/2024/bn240112742/quicklook/glg_healpix_all_bn240112742.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240112742/quicklook/glg_lc_medres34_bn240112742.gif\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35529.",
"published": "2024-01-13T00:04:32.854912Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-13T00:04:32.854927Z",
"modified": "2024-01-13T00:04:32.862134Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5782,
"topic": "gcn.circular",
"uuid": "262c1c17-808f-4380-86b6-c37846ef3c55",
"title": "GRB 240112C: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "24/01/13 04:58:59 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35530"
},
"title": "GCN CIRCULAR",
"number": "35530",
"subject": "GRB 240112C: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. A. Maslennikova (SAO RAS)\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of Swift GRB 240112C (Eyles-Ferris et al.,\nGCN #35522) with the 1-m telescope of SAO RAS equipped with the CCD\nphotometer. We obtained 21 x 60 sec. images in Rc band on January 13,\n03:00:16--03:34:31 UT (t_mid - T0 = 0.40277 days) under mediocre\nweather conditions.\n\nWe did not detect any significant source at the OT position\ndown to the limiting magnitude R_lim = 21.1\n(based on R2 magnitudes of nearby USNO-B1 stars).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35530.",
"published": "2024-01-13T04:59:10.391204Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-13T04:59:10.391225Z",
"modified": "2024-01-13T04:59:10.397391Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5783,
"topic": "gcn.circular",
"uuid": "ef5e458a-44d2-492f-a363-1f58675e8537",
"title": "GRB 240112C: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/13 10:19:51 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35531"
},
"title": "GCN CIRCULAR",
"number": "35531",
"subject": "GRB 240112C: Swift-XRT refined Analysis"
},
"message_text": "K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo\n(INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) ,\nJ.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.3 ks of XRT data for GRB 240112C, from 97 s to 45.8\nks after the BAT trigger. The data comprise 39 s in Windowed Timing\n(WT) mode (the first 10 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode. Using 2660 s of PC mode data\nand 6 UVOT images, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 270.64402, +24.48893 which is equivalent to:\n\nRA (J2000): 18h 02m 34.56s\nDec(J2000): +24d 29' 20.2\"\n\nwith an uncertainty of 2.0 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=0.61 (+0.04, -0.48), followed by a break at T+5970 s to\nan alpha of 1.30 (+0.18, -0.20).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.92 (+0.14, -0.13). The\nbest-fitting absorption column is 2.0 (+0.5, -0.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.3 x 10^21 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.6 x 10^-11 (4.8 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 2.0 (+0.5, -0.4) x 10^21 cm^-2\nGalactic foreground: 1.3 x 10^21 cm^-2\nExcess significance: 2.5 sigma\nPhoton index:\t 1.92 (+0.14, -0.13)\n\nIf the light curve continues to decay with a power-law decay index of\n1.30, the count rate at T+24 hours will be 0.015 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.3 x\n10^-13 (7.0 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/01208389.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35531.",
"published": "2024-01-13T10:20:01.423231Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-13T10:20:01.423249Z",
"modified": "2024-01-13T10:20:01.432807Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5784,
"topic": "gcn.circular",
"uuid": "2219faae-74eb-4b0b-9cc6-983d0f04b326",
"title": "Fermi trigger No 726773850: 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": "24/01/13 11:15:35 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35532"
},
"title": "GCN CIRCULAR",
"number": "35532",
"subject": "Fermi trigger No 726773850: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240112.73 (trigger No 726773850,17h 29m 57.60s , +29d 09m 00.0s, R=2.34) errorbox 60679 sec after notice time and 60712 sec after trigger time at 2024-01-13 10:29:17 UT, with upper limit up to 15.8 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -9.8 deg.\n\nThe galactic latitude b = 29 deg., longitude l = 53 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#54479\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 60714 | 2024-01-13 10:29:17 | MASTER-Tunka | (17h 26m 43.34s , +31d 35m 05.0s) | C | 1 | 13.3 |\n 60755 | 2024-01-13 10:29:59 | MASTER-Tunka | (17h 41m 27.44s , +29d 41m 01.1s) | C | 1 | 13.1 |\n 61496 | 2024-01-13 10:42:12 | MASTER-Tunka | (17h 44m 34.77s , +31d 33m 39.2s) | C | 15 | 15.8 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35532.",
"published": "2024-01-13T11:15:56.670139Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-13T11:15:56.670157Z",
"modified": "2024-01-13T11:15:56.679171Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5785,
"topic": "gcn.circular",
"uuid": "16b87745-1942-4a28-996a-63ae618c81cd",
"title": "GRB 240112C: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"data": {
"date": "24/01/13 16:09:48 GMT",
"from": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35533"
},
"title": "GCN CIRCULAR",
"number": "35533",
"subject": "GRB 240112C: Fermi GBM Detection"
},
"message_text": "P. Veres (UAH), R. Hamburg (CNRS/IN2P3), A. Myers (NPP/GSFC) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 17:37:25.12 UT on 12 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240112C (trigger 726773850/240112734). GRB 240112C\nwas also localized by Swift BAT and XRT (Eyles-Ferris et al., GCN #35522).\nThe Fermi GBM on-ground Localization is consistent with the Swift position.\n\n\nThe angle from the Fermi LAT boresight is 43 degrees.\n\nThe GBM light curve consists of two pulses with a duration (T90)\nof about 5.3 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.6 to T0+6.3 s is best fit by\na Band function with with Epeak= 71 +/- 6 keV, alpha = -1.26 +/- 0.08\nand beta = -2.34 +/- 0.10.\n\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.8 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.064 s in the 10-1000 keV band is 20.2 +/- 0.4 ph/s/cm^2.\n\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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35533.",
"published": "2024-01-13T16:10:04.677607Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-13T16:10:04.677623Z",
"modified": "2024-01-13T16:10:04.685218Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5794,
"topic": "gcn.circular",
"uuid": "8a235422-29b3-438b-918c-dc4bad06122b",
"title": "GRB 240112C: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "24/01/14 18:22:22 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35534"
},
"title": "GCN CIRCULAR",
"number": "35534",
"subject": "GRB 240112C: Swift/UVOT Detection"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) and Eyles-Ferris (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240112C\n121 s after the BAT trigger (Eyles-Ferris et al., GCN Circ. 35522).\nA source consistent with the XRT position is detected in the initial\nUVOT exposures.\n\nThe preliminary UVOT position is:\n RA (J2000) = 18:02:34.58 = 270.64410 (deg.)\n Dec (J2000) = +24:29:21.3 = 24.48925 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric\nsystem\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 121 236 113 16.98 +/- 0.04\nv 4955 5126 169 >18.6\nb 4340 4539 197 19.35 +/- 0.16\nu 4134 4334 197 19.11 +/- 0.18\nw1 3930 4129 197 19.13 +/- 0.24\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.108 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35534.",
"published": "2024-01-14T18:22:39.387975Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-14T18:22:39.387987Z",
"modified": "2024-01-14T18:22:39.395200Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5797,
"topic": "gcn.circular",
"uuid": "1e41134e-0e6a-4e55-875d-f7896cc23c9f",
"title": "GRB 240114A: MAXI/GSC detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/01/15 00:53:26 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35535"
},
"title": "GCN CIRCULAR",
"number": "35535",
"subject": "GRB 240114A: MAXI/GSC detection"
},
"message_text": "T. Kawamuro (RIKEN), M. Serino (AGU),\nH. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, E.Goto (Chuo U.),\nM. Shidatsu, Y. Niida (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, Y. Okada (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\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source\nat 14:28:50 UT on January 14, 2024.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (78.966 deg, 33.742 deg) = (05 15 51, +33 44 31) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.28 deg and 0.25 deg, respectively.\nThe roll angle of long axis from the north direction is 159.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 145 +- 21 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n (77.740, 33.819) deg = (05 10 57, +33 49 08) (J2000)\n (77.869, 33.281) deg = (05 11 28, +33 16 51) (J2000)\n (80.079, 33.628) deg = (05 20 18, +33 37 40) (J2000)\n (79.963, 34.167) deg = (05 19 51, +34 10 01) (J2000).\nThere was no significant excess flux in the previous transit at 12:55 UT\nand in the next transit at 16:01 UT with an upper limit of 20 mCrab for each.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35535.",
"published": "2024-01-15T00:53:38.080974Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T00:53:38.080988Z",
"modified": "2024-01-15T00:53:38.090979Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5805,
"topic": "gcn.circular",
"uuid": "37da4ad8-586e-4ae1-b212-c162020ccf1f",
"title": "GRB 240115A: 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": "24/01/15 11:13:50 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35537"
},
"title": "GCN CIRCULAR",
"number": "35537",
"subject": "GRB 240115A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 11:03:14 UT on 15 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240115A (trigger 727009399.105114 / 240115461).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 16.3, Dec = 25.0 (J2000 degrees, equivalent to J2000 01h 05m, 25d 00'), with a statistical uncertainty of 4.4 degrees.\n\nThe angle from the Fermi LAT boresight is 37.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115461/quicklook/glg_skymap_all_bn240115461.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/2024/bn240115461/quicklook/glg_healpix_all_bn240115461.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115461/quicklook/glg_lc_medres34_bn240115461.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35537.",
"published": "2024-01-15T11:14:04.574995Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T11:14:04.575011Z",
"modified": "2024-01-15T11:14:04.581969Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5810,
"topic": "gcn.circular",
"uuid": "75b10633-beaf-43a3-b97b-8b1396e2a083",
"title": "Fermi GRB 240115A: 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": "24/01/15 15:30:57 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35538"
},
"title": "GCN CIRCULAR",
"number": "35538",
"subject": "Fermi GRB 240115A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 240115A ( Fermi GBM team, GCN 35537) errorbox 13877 sec after notice time and 13910 sec after trigger time at 2024-01-15 14:55:04 UT, with upper limit up to 19.2 mag. Observations started at twilight. The observations began at zenith distance = 19 deg. The sun altitude is -10.0 deg.\n\nThe galactic latitude b = -37 deg., longitude l = 128 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#56263\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 13941 | 2024-01-15 14:55:04 | MASTER-Kislovodsk | (01h 07m 03.13s , +24d 05m 02.7s) | C | 60 | 17.4 |\n 13941 | 2024-01-15 14:55:04 | MASTER-Kislovodsk | (01h 02m 17.63s , +24d 26m 24.4s) | C | 60 | 17.9 |\n 14021 | 2024-01-15 14:56:24 | MASTER-Kislovodsk | (01h 08m 11.48s , +25d 57m 59.8s) | C | 60 | 17.3 |\n 14021 | 2024-01-15 14:56:24 | MASTER-Kislovodsk | (01h 03m 20.55s , +26d 19m 30.1s) | C | 60 | 18.1 |\n 14101 | 2024-01-15 14:57:44 | MASTER-Kislovodsk | (01h 06m 06.56s , +22d 09m 02.3s) | C | 60 | 17.6 |\n 14101 | 2024-01-15 14:57:44 | MASTER-Kislovodsk | (01h 01m 25.70s , +22d 30m 16.1s) | C | 60 | 18.2 |\n 14181 | 2024-01-15 14:59:05 | MASTER-Kislovodsk | (01h 09m 19.88s , +27d 51m 14.0s) | C | 60 | 17.9 |\n 14181 | 2024-01-15 14:59:05 | MASTER-Kislovodsk | (01h 04m 22.98s , +28d 12m 53.3s) | C | 60 | 18.6 |\n 14342 | 2024-01-15 15:01:45 | MASTER-Kislovodsk | (01h 11m 41.84s , +27d 51m 13.9s) | C | 60 | 12.2 |\n 14342 | 2024-01-15 15:01:45 | MASTER-Kislovodsk | (01h 06m 17.06s , +28d 12m 53.2s) | C | 60 | 13.0 |\n 14428 | 2024-01-15 15:03:12 | MASTER-Kislovodsk | (01h 23m 42.15s , +24d 03m 56.9s) | C | 60 | 17.6 |\n 14428 | 2024-01-15 15:03:12 | MASTER-Kislovodsk | (01h 18m 55.85s , +24d 25m 21.2s) | C | 60 | 18.4 |\n 14508 | 2024-01-15 15:04:32 | MASTER-Kislovodsk | (01h 24m 59.31s , +25d 58m 54.8s) | C | 60 | 17.6 |\n 14508 | 2024-01-15 15:04:32 | MASTER-Kislovodsk | (01h 20m 07.62s , +26d 20m 27.2s) | C | 60 | 18.5 |\n 14588 | 2024-01-15 15:05:52 | MASTER-Kislovodsk | (01h 22m 39.20s , +22d 09m 58.7s) | C | 60 | 17.7 |\n 14589 | 2024-01-15 15:05:52 | MASTER-Kislovodsk | (01h 17m 57.65s , +22d 31m 14.5s) | C | 60 | 18.5 |\n 14669 | 2024-01-15 15:07:12 | MASTER-Kislovodsk | (01h 10m 31.29s , +29d 44m 45.2s) | C | 60 | 18.1 |\n 14669 | 2024-01-15 15:07:12 | MASTER-Kislovodsk | (01h 05m 27.63s , +30d 06m 28.4s) | C | 60 | 19.0 |\n 14749 | 2024-01-15 15:08:33 | MASTER-Kislovodsk | (00h 53m 05.72s , +29d 44m 46.8s) | C | 60 | 17.6 |\n 14749 | 2024-01-15 15:08:33 | MASTER-Kislovodsk | (00h 48m 02.39s , +30d 06m 24.1s) | C | 60 | 18.5 |\n 14829 | 2024-01-15 15:09:53 | MASTER-Kislovodsk | (01h 26m 28.47s , +27d 52m 28.5s) | C | 60 | 18.3 |\n 14829 | 2024-01-15 15:09:53 | MASTER-Kislovodsk | (01h 21m 30.85s , +28d 14m 03.1s) | C | 60 | 19.1 |\n 14909 | 2024-01-15 15:11:13 | MASTER-Kislovodsk | (01h 07m 06.90s , +24d 03m 15.5s) | C | 60 | 17.8 |\n 14909 | 2024-01-15 15:11:13 | MASTER-Kislovodsk | (01h 02m 20.68s , +24d 24m 31.4s) | C | 60 | 18.7 |\n 14989 | 2024-01-15 15:12:33 | MASTER-Kislovodsk | (01h 07m 45.05s , +24d 03m 14.9s) | C | 60 | 12.2 |\n 15070 | 2024-01-15 15:13:54 | MASTER-Kislovodsk | (01h 06m 06.89s , +22d 09m 52.3s) | C | 60 | 17.9 |\n 15070 | 2024-01-15 15:13:54 | MASTER-Kislovodsk | (01h 01m 25.53s , +22d 31m 04.6s) | C | 60 | 18.8 |\n 15150 | 2024-01-15 15:15:14 | MASTER-Kislovodsk | (01h 09m 14.79s , +27d 52m 44.6s) | C | 60 | 18.2 |\n 15150 | 2024-01-15 15:15:14 | MASTER-Kislovodsk | (01h 04m 17.33s , +28d 14m 21.2s) | C | 60 | 19.1 |\n 15231 | 2024-01-15 15:16:34 | MASTER-Kislovodsk | (00h 51m 17.60s , +25d 57m 43.3s) | C | 60 | 17.6 |\n 15231 | 2024-01-15 15:16:34 | MASTER-Kislovodsk | (00h 46m 26.19s , +26d 19m 07.1s) | C | 60 | 18.6 |\n 15311 | 2024-01-15 15:17:55 | MASTER-Kislovodsk | (00h 50m 25.77s , +24d 02m 44.3s) | C | 60 | 17.5 |\n 15311 | 2024-01-15 15:17:55 | MASTER-Kislovodsk | (00h 45m 39.64s , +24d 23m 59.8s) | C | 60 | 18.6 |\n 15391 | 2024-01-15 15:19:15 | MASTER-Kislovodsk | (00h 52m 08.59s , +27d 51m 01.3s) | C | 60 | 17.7 |\n 15391 | 2024-01-15 15:19:15 | MASTER-Kislovodsk | (00h 47m 11.31s , +28d 12m 32.4s) | C | 60 | 18.7 |\n 15471 | 2024-01-15 15:20:35 | MASTER-Kislovodsk | (01h 23m 45.34s , +24d 04m 49.5s) | C | 60 | 17.8 |\n 15471 | 2024-01-15 15:20:35 | MASTER-Kislovodsk | (01h 18m 58.26s , +24d 26m 10.2s) | C | 60 | 18.7 |\n 15552 | 2024-01-15 15:21:55 | MASTER-Kislovodsk | (01h 25m 03.41s , +25d 57m 04.1s) | C | 60 | 17.7 |\n 15552 | 2024-01-15 15:21:55 | MASTER-Kislovodsk | (01h 20m 11.05s , +26d 18m 33.0s) | C | 60 | 18.8 |\n 15632 | 2024-01-15 15:23:15 | MASTER-Kislovodsk | (01h 22m 39.41s , +22d 10m 36.5s) | C | 60 | 16.2 |\n 15632 | 2024-01-15 15:23:15 | MASTER-Kislovodsk | (01h 17m 57.15s , +22d 31m 48.8s) | C | 60 | 17.0 |\n 15712 | 2024-01-15 15:24:35 | MASTER-Kislovodsk | (01h 24m 25.47s , +22d 10m 36.3s) | C | 60 | 12.7 |\n 15800 | 2024-01-15 15:26:03 | MASTER-Kislovodsk | (01h 26m 31.35s , +27d 51m 45.8s) | C | 60 | 18.5 |\n 15800 | 2024-01-15 15:26:03 | MASTER-Kislovodsk | (01h 21m 33.05s , +28d 13m 22.4s) | C | 60 | 19.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35538.",
"published": "2024-01-15T15:31:12.084777Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T15:31:12.084800Z",
"modified": "2024-01-15T15:31:12.094502Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5816,
"topic": "gcn.circular",
"uuid": "22e206f7-8d43-42cf-95be-e3bf1c769d92",
"title": "Fermi GRB 240115B: 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": "24/01/15 20:45:42 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35542"
},
"title": "GCN CIRCULAR",
"number": "35542",
"subject": "Fermi GRB 240115B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240115B ( Fermi GBM team, GCN 35540) errorbox 12811 sec after notice time and 12818 sec after trigger time at 2024-01-15 20:19:16 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 87 deg. The sun altitude is -26.0 deg.\n\nThe galactic latitude b = 28 deg., longitude l = 299 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#56581\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 12909 | 2024-01-15 20:19:16 | MASTER-SAAO | (12h 43m 33.54s , -35d 23m 00.7s) | C | 180 | 16.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35542.",
"published": "2024-01-15T20:45:52.621125Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T20:45:52.621153Z",
"modified": "2024-01-15T20:45:52.628556Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6560,
"topic": "gcn.circular",
"uuid": "7d8c93a2-0cc7-46cd-9fd1-228f425c12de",
"title": "IPN triangulation of GRB 240411A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/04/14 14:00:48 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36090"
},
"title": "GCN CIRCULAR",
"number": "36090",
"subject": "IPN triangulation of GRB 240411A"
},
"message_text": "D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nand\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team, report:\n\nThe long-duration GRB 240411A\n(Fermi-GBM detection: The Fermi GBM team, GCN 36061;\nGRBAlpha detection: Pal et al., GCN 36068)\nwas detected by Fermi (GBM trigger 734492703),\nINTEGRAL (SPI-ACS), Swift (BAT), Konus-Wind, and GRBAlpha\nat about 6298 s UT (01:44:58).\nThe burst was outside the coded field of view of the BAT.\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 246.889 (16h 27m 33s) +45.010 (+45d 00' 36\")\n Corners:\n 251.205 (16h 44m 49s) +41.318 (+41d 19' 05\")\n 251.479 (16h 45m 55s) +41.818 (+41d 49' 03\")\n 241.660 (16h 06m 38s) +48.434 (+48d 26' 03\")\n 241.553 (16h 06m 13s) +47.881 (+47d 52' 53\")\n ---------------------------------------------\nThe error box area is 4.6 sq. deg, and its maximum\ndimension is 9.8 deg (the minimum one is 29 arcmin).\nThe Sun distance was 111 deg.\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240411_T06302/IPN/\n\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36090.",
"published": "2024-04-14T14:01:02.286481Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T14:01:02.286503Z",
"modified": "2024-04-14T14:01:02.294747Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5811,
"topic": "gcn.circular",
"uuid": "16dbdada-9808-40e5-9965-31aa5940ef44",
"title": "Konus-Wind detection of GRB 240112C",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/01/15 15:31:10 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35539"
},
"title": "GCN CIRCULAR",
"number": "35539",
"subject": "Konus-Wind detection of GRB 240112C"
},
"message_text": "A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 240112C\n(Swift-BAT detection: Eyles-Ferris et al., GCN 35522;\nFermi-GBM detection: Veres at al., GCN 35533;\nGRBAlpha detection: Dafcikova et al., GCN 34436)\ntriggered Konus-Wind at T0c441.633 s UT (17:37:21.633).\n\nThe burst light curve shows a double-peaked structure,\nwhich starts at ~T0-0.5 s and has a total duration of ~4 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240112_T63441/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 3.70(-0.39,+0.46)x10^-6 erg/cm2,\nand a 64-ms peak flux, measured from T0+2.384 s,\nof 3.30(-0.84,+0.88)x10^-6 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum of the burst\n(measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 10 MeV range\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -1.59(-0.22,+0.26)\nand Ep = 79(-18,+18) keV (chi2 = 66/74 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.3\n(chi2 = 64/73 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35539.",
"published": "2024-01-15T15:31:37.129442Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T15:31:37.129458Z",
"modified": "2024-01-15T15:31:37.136115Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5812,
"topic": "gcn.circular",
"uuid": "5b361bfd-25a0-4144-a38e-1cc5474d45e2",
"title": "GRB 240115B: 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": "24/01/15 16:56:08 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35540"
},
"title": "GCN CIRCULAR",
"number": "35540",
"subject": "GRB 240115B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 16:45:37 UT on 15 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240115B (trigger 727029942.62324 / 240115698).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 188.3, Dec = -34.8 (J2000 degrees, equivalent to J2000 12h 33m, -34d 47'), with a statistical uncertainty of 4.7 degrees.\n\nThe angle from the Fermi LAT boresight is 98.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_skymap_all_bn240115698.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/2024/bn240115698/quicklook/glg_healpix_all_bn240115698.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35540.",
"published": "2024-01-15T16:56:19.378819Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T16:56:19.378834Z",
"modified": "2024-01-15T16:56:19.386435Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5813,
"topic": "gcn.circular",
"uuid": "7bcd66aa-4338-4dfb-bc81-351759e9a158",
"title": "GRB 240115B: A long GRB detected by INTEGRAL",
"submitter": "Hop gcn.circular",
"authors": "Sandro Mereghetti at IASF-Milano/INAF <sandro.mereghetti@inaf.it>",
"data": {
"date": "24/01/15 19:53:08 GMT",
"from": "Sandro Mereghetti at IASF-Milano/INAF <sandro.mereghetti@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35541"
},
"title": "GCN CIRCULAR",
"number": "35541",
"subject": "GRB 240115B: A long GRB detected by INTEGRAL"
},
"message_text": "S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:\n\na gamma ray burst lasting about 190 s has been detected by IBAS in the IBIS/ISGRI data at 16:43:30 UT of 2024 Jan 15. The burst was detected at a large off-axis angle (about 13 degrees) resulting in a low significance and large uncertainties. We note that the brightest part of the burst was also detected by the Fermi/GBM (GCN circ. 35540)\n\nThe refined coordinates (J2000) are:\nR.A.= 191.894 deg\nDEC.= -35.566 deg\nwith an uncertainty of 3.5 arcmin (90% c.l.).\n\nThe burst had a fluence of about 4e-6 erg/cmq in the 20-200 keV range.\n\nA plot of the light curve will be posted at\nhttp://ibas.iasf-milano.inaf.it/IBAS_Results.html\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35541.",
"published": "2024-01-15T19:53:22.724855Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T19:53:22.724872Z",
"modified": "2024-01-15T19:53:22.733198Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5819,
"topic": "gcn.circular",
"uuid": "23d9c1f9-baee-4ff6-9f31-8629cbfae8b2",
"title": "Integral GRB240115.70: 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": "24/01/15 21:38:42 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35543"
},
"title": "GCN CIRCULAR",
"number": "35543",
"subject": "Integral GRB240115.70: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Integral GRB240115.70 (trigger No 10472,12h 47m 16.10s , -35d 33m 29.1s, R=0.053) errorbox 12776 sec after notice time and 12801 sec after trigger time at 2024-01-15 20:19:16 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 87 deg. The sun altitude is -26.0 deg.\n\nThe galactic latitude b = 27 deg., longitude l = 303 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#56567\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 12891 | MASTER-SAAO | C | 180 | 16.3 |\n 14129 | MASTER-SAAO | C | 180 | 15.3 |\n 14129 | MASTER-SAAO | C | 180 | 17.6 |\n 14329 | MASTER-SAAO | C | 180 | 16.3 |\n 14329 | MASTER-SAAO | C | 180 | 18.0 |\n 14509 | MASTER-SAAO | C | 540 | 18.5 | Coadd\n 14529 | MASTER-SAAO | C | 180 | 16.8 |\n 14529 | MASTER-SAAO | C | 180 | 18.0 |\n 14729 | MASTER-SAAO | C | 180 | 17.3 |\n 14909 | MASTER-SAAO | C | 540 | 18.3 | Coadd\n 14729 | MASTER-SAAO | C | 180 | 18.1 |\n 14928 | MASTER-SAAO | C | 180 | 17.3 |\n 14928 | MASTER-SAAO | C | 180 | 18.0 |\n 15128 | MASTER-SAAO | C | 180 | 17.7 |\n 15128 | MASTER-SAAO | C | 180 | 18.3 |\n 15330 | MASTER-SAAO | C | 180 | 18.0 |\n 15330 | MASTER-SAAO | C | 180 | 18.7 |\n 15536 | MASTER-SAAO | C | 180 | 18.9 |\n 15536 | MASTER-SAAO | C | 180 | 18.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35543.",
"published": "2024-01-15T21:38:51.532493Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-15T21:38:51.532510Z",
"modified": "2024-01-15T21:38:51.540901Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6561,
"topic": "gcn.circular",
"uuid": "df292521-57a6-49e6-8fac-f51e7013c7ed",
"title": "EP240414a: EP-WXT detection of a fast X-ray transient",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/14 14:44:16 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36091"
},
"title": "GCN CIRCULAR",
"number": "36091",
"subject": "EP240414a: EP-WXT detection of a fast X-ray transient"
},
"message_text": "T. Y. Lian, X. Pan, Z. X. Ling, Y. Liu, C. Zhang, C. C. Jin, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, X. Mao, H. W. Pan, H. Sun, W. X. Wang, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, W. Yuan, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), J. Yang, C. Y. Dai (NJU), Y. F. Liang (PMO), Y. Chen, S. M. Jia, S. N. Zhang (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe team\n\nWe report on the detection of a fast X-ray transient, desinated EP240414a, by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission. The transient triggered the WXT on-board processing unit at 2024-04-14T09:50:12 (UTC). The position of the source is R.A. = 191.498 deg, DEC = -9.695 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic). The transient event has a peak flux of ~3 x 10^-9 erg/s/cm^2 in the 0.5-4 keV band.\n\nNo previously known X-ray sources at a similar flux level are found within the 3 arcmin region around the source position. Further information will be provided once the data has been transmitted through a ground station.\n\nThe above observation was made with the WXT instrument during the commissioning phase of EP. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36091.",
"published": "2024-04-14T14:44:32.375423Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T14:44:32.375437Z",
"modified": "2024-04-14T14:44:32.383187Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5832,
"topic": "gcn.circular",
"uuid": "fb17343a-e9ac-4940-8b64-8a4dcd1d760c",
"title": "GRB 240107A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/16 16:04:16 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35544"
},
"title": "GCN CIRCULAR",
"number": "35544",
"subject": "GRB 240107A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long-duration GRB 240107A (MAXI/GSC detection: GCN 35495; AstroSat detection: GCN 35503; Fermi/GBM detection: trigger no. 726347794; INTEGRAL/SPI-ACS peak detection at 2024-01-07 ~19:16:45 UT) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector unit no. 0. The detection was confirmed at the peak time 2024-01-07 19:17:17 UTC. The T90 duration is 47 s and the significance during T90 reaches 10 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB240107A_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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35544.",
"published": "2024-01-16T16:04:30.681903Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-16T16:04:30.681916Z",
"modified": "2024-01-16T16:04:30.691480Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5833,
"topic": "gcn.circular",
"uuid": "002b18f7-effb-45df-8fa4-7f9e11f0a94a",
"title": "GRB 240112C: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/16 16:05:00 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35545"
},
"title": "GCN CIRCULAR",
"number": "35545",
"subject": "GRB 240112C: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long-duration GRB 240112C (Swift/BAT detection: GCN 35522; Fermi/GBM detection: GCN 35533; GRBAlpha detection: GCN 35536; Konus/Wind detection: GCN 35539; INTEGRAL/SPI-ACS detection: trigger no. 10466) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2024-01-12 17:37:27 UTC. The T90 duration is 3 s and the significance during T90 reaches 14 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB240112C_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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35545.",
"published": "2024-01-16T16:05:07.741066Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-16T16:05:07.741083Z",
"modified": "2024-01-16T16:05:07.747357Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5834,
"topic": "gcn.circular",
"uuid": "0474cd29-8cf5-432a-8334-b3d08bf964ca",
"title": "GRB 240112D: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/16 17:32:58 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35547"
},
"title": "GCN CIRCULAR",
"number": "35547",
"subject": "GRB 240112D: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: \n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240112D, which was also detected by Fermi/GBM (GCN #35527) and INTEGRAL/SPI-ACS (Trigger no. 10468).\n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-12 21:56:04.064 with a duration of 2.56 s and a total significance of about 13.0 sigma. The light curve comprises a single peak.\n \nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.5 and a cutoff energy (\"Epeak\") of 455 keV. The modeled 10-10000 keV fluence is 1.3e-06 erg/cm^2.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35547.",
"published": "2024-01-16T17:33:33.427072Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-16T17:33:33.427090Z",
"modified": "2024-01-16T17:33:33.435715Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5835,
"topic": "gcn.circular",
"uuid": "b96d5abf-b45f-4bf6-8419-7362b8d4610b",
"title": "IceCube-240105A: ZTF optical observation of blazar PKS 0446+11",
"submitter": "Hop gcn.circular",
"authors": "Jannis Necker at DESY <jannis.necker@desy.de>",
"data": {
"date": "24/01/16 20:09:30 GMT",
"from": "Jannis Necker at DESY <jannis.necker@desy.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35548"
},
"title": "GCN CIRCULAR",
"number": "35548",
"subject": "IceCube-240105A: ZTF optical observation of blazar PKS 0446+11"
},
"message_text": "Jannis Necker (DESY), Simeon Reusch (DESY), Robert Stein (Caltech), Sven Weimann (Ruhr University Bochum) and Anna Franckowiak (DESY/Ruhr University Bochum) report:\n\nWe observed the blazar PKS 0446+11 with the Palomar 48-inch telescope as part of our ZTF neutrino follow up campaign (Necker et. al, GCN 35510) of IceCube-240105A (Sommani et. al, GCN 35498).\n\nThe blazar is detected over 2000 days with clear signs of variability. It recently reached its peak brightness in g-band in November after a around one month long rise in both g- and r-band, which coincides with activities in gamma-rays (ATEL #16398) and radio (ATEL #16399). At 2024-01-06T06:16:01.001280, we measured the all-time peak r-band brightness (17.1mag) only around 17 hours after the detection of IceCube-240105A, coinciding with the recent activitiy in X-rays (ATEL #16397). The blazar has since faded in both bands to 19.5mag in g-band and 18.3mag in r-band.\n\nThe blazar was not selected as a candidate counterpart by our automatic follow-up pipeline because it got rejected as a star based on a metric derived from Pan-STARRS data (Tachibana & Miller, 2018, PASP 130 128001).\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.\n\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019).\nAlert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35548.",
"published": "2024-01-16T20:09:41.102006Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-16T20:09:41.102024Z",
"modified": "2024-01-16T20:09:41.109276Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6562,
"topic": "gcn.circular",
"uuid": "be7c23a7-dae0-454f-8302-0e57dbdef5a3",
"title": "EP240413a: possible detection of the X-ray emission with EP-FXT after 14 hours",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/14 16:17:35 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36092"
},
"title": "GCN CIRCULAR",
"number": "36092",
"subject": "EP240413a: possible detection of the X-ray emission with EP-FXT after 14 hours"
},
"message_text": "C. K. Li, S.M. Jia, Y. Chen, W. W. Cui, H. Feng, J. Guan, D. W. Han, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, J. Zhang, S. N. Zhang, H. S. Zhao, X. F. Zhao (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA), T. Y. Lian, X. Pan, Z. X. Ling, Y. Liu, H. Sun, D. Y. Li, H. Y. Liu, W. Yuan, C. Zhang (NAOC, CAS) on behalf of the Einstein Probe team\n\nFollowing the detection of the fast X-ray transient EP240413a (Lian et al., GCN 36086) by the Wide-field X-ray Telescope (WXT) of Einstein Probe (EP), we performed an observation with the Follow-up X-ray Telescope (FXT) on board EP. The observation started at 2024-04-14T04:40:26, about 14 hours after the WXT detection, with a net exposure time of 9.3 ks.\n\nAn X-ray source was clearly detected at R.A. = 228.815 deg, DEC = -18.503 deg, with an uncertainty of 30 arcsec (radius, 90% C.L. statistical and systematic). There is no cataloged X-ray source within the error circle. Considering this source being within the error circle of the WXT source (17.9 arcmin away), we tend to suggest it to be possibly associated with EP240413a. If this is true, EP240413a has faded by about 3 orders of magnitude in X-ray flux in about 14 hours. The spectrum can be fitted with an absorbed power-law model with NH fixed at the Galactic value of 1.1e21 cm-2 and a photon index of 2.2(+/-0.3) (90% C.L.). The derived unabsorbed flux in 0.5-10 keV is 5.3(+/-0.5)e-13 erg/s/cm2 (90% C.L.). Further monitoring of EP240413a with FXT is planned for the next few days.\n\nPlease note that EP-FXT is currently undergoing in-flight calibration. The derived source parameters may be subject to larger uncertainties, so please use them with caution. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36092.",
"published": "2024-04-14T16:17:50.428182Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T16:17:50.428198Z",
"modified": "2024-04-14T16:17:50.436062Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6563,
"topic": "gcn.circular",
"uuid": "b9563381-bc2b-40a4-ae0f-ca750558a654",
"title": "IPN triangulation of GRB 240410A",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/04/14 16:23:21 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36093"
},
"title": "GCN CIRCULAR",
"number": "36093",
"subject": "IPN triangulation of GRB 240410A"
},
"message_text": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the HEND/Mars Odyssey team,\n\nA. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team,\n\nand\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,\nand A.S. Gardner on on behalf of the GRS-Odyssey GRB team,\nreport:\n\nThe long-duration GRB 240410A\nwas detected by INTEGRAL (SPI-ACS), Swift (BAT), Konus-Wind,\nand Mars-Odyssey (HEND) at about 73409 s UT (20:23:29).\nThe burst was outside the coded field of view of the BAT.\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 109.832 (07h 19m 20s) +30.179 (+30d 10' 43\")\n Corners:\n 110.414 (07h 21m 39s) +32.327 (+32d 19' 37\")\n 110.411 (07h 21m 39s) +32.546 (+32d 32' 46\")\n 109.265 (07h 17m 04s) +27.655 (+27d 39' 19\")\n 109.268 (07h 17m 04s) +27.350 (+27d 21' 01\")\n ---------------------------------------------\nThe error box area is 957 sq. arcmin, and its maximum\ndimension is 5.3 deg (the minimum one is 3 arcmin).\nThe Sun distance was 86 deg.\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240410_T73409/IPN/\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36093.",
"published": "2024-04-14T16:23:37.033525Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T16:23:37.033540Z",
"modified": "2024-04-14T16:23:37.041293Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5838,
"topic": "gcn.circular",
"uuid": "663629fd-be16-48fa-8ee9-bcc3a09d4f2b",
"title": "GRB 240115B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"data": {
"date": "24/01/17 07:19:29 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35551"
},
"title": "GCN CIRCULAR",
"number": "35551",
"subject": "GRB 240115B: AstroSat CZTI detection"
},
"message_text": "J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240115B which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35540), and INTEGRAL (S.Mereghetti et al., GCN Circ. 35541).\n\nThe source was detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-01-15 16:45:40.50 UTC. The measured peak count rate associated with the burst is 80 (+42, -5) counts/s above the background in the combined data of three quadrants (out of four), with a total of 2052 (+489, -339) counts. The local mean background count rate was 280 (+1, -4) counts/s. Using cumulative rates, we measure a T90 of 47 (+7, -4) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-01-15 16:46:04.75 UTC. The measured peak count rate associated with the burst is 127 (+72, -1) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1941 (+685, -748) counts. The local mean background count rate was 1168 (+5, -5) counts/s. We measure a T90 of 36 (+6, -10) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35551.",
"published": "2024-01-17T07:19:43.240580Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T07:19:43.240600Z",
"modified": "2024-01-17T07:19:43.250205Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5839,
"topic": "gcn.circular",
"uuid": "ecd2ce61-a771-4468-b112-8acb0d86837a",
"title": "Swift Triggers 1209369 and 1209370 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "24/01/17 07:57:30 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35552"
},
"title": "GCN CIRCULAR",
"number": "35552",
"subject": "Swift Triggers 1209369 and 1209370 are not astrophysical events"
},
"message_text": "\nA. D'Ai (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR),\nA. Melandri (INAF-OAR), K. L. Page (U Leicester), D. M. Palmer (LANL)\nand M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift Triggers 1209369 and 1209370 are not astrophysical events.\nThey were caused by misidentifcation of a known source (in this case,\nSco X-1) when the star trackers had lost lock. For the near future,\nplease verify that the Swift GCN notices do not have the comment\nCOMMENTS: This trigger occured while the StarTracker\n had lost lock, so it is possibly bogus.\nGCN 34709 lists sources which BAT currently sees, so notices\nwith coordinates near these locations should be treated as suspect.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35552.",
"published": "2024-01-17T07:57:40.116467Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T07:57:40.116483Z",
"modified": "2024-01-17T07:57:40.125231Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5840,
"topic": "gcn.circular",
"uuid": "5f00eb72-84d0-4e92-8687-484b257d69ea",
"title": "Swift Triggers 1209371 through 1209374 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/17 09:16:40 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35553"
},
"title": "GCN CIRCULAR",
"number": "35553",
"subject": "Swift Triggers 1209371 through 1209374 are not astrophysical events"
},
"message_text": "\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nFollowing on from GCN Circular 35552, we confirm that Swift triggers\n1209371, 1209372, 1209373 and 1209374 (trigger times between\n2024-01-17 07:57 and 08:22 UT) were also caused by the star tracker\nloss-of-lock event, and are not interesting astrophysical events.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35553.",
"published": "2024-01-17T09:16:50.703832Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T09:16:50.703847Z",
"modified": "2024-01-17T09:16:50.712654Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5841,
"topic": "gcn.circular",
"uuid": "cfe7ed50-59ca-45f3-af32-ca6b35f6b390",
"title": "IPN triangulation of GRB 240112A (long)",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/01/17 14:46:49 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35554"
},
"title": "GCN CIRCULAR",
"number": "35554",
"subject": "IPN triangulation of GRB 240112A (long)"
},
"message_text": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the HEND/Mars Odyssey team,\n\nA. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nand\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,\nand A.S. Gardner on on behalf of the GRS-Odyssey GRB team,\nreport:\n\nThe long-duration GRB 240112A\n(GECAM-B detection: Wang and Xiong, GCN 35520)\nhas been detected by Konus-Wind, INTEGRAL (SPI-ACS),\nGECAM-B, and Mars-Odyssey (HEND), so far,\nat about 20482 s UT (05:41:22).\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 289.407 (19h 17m 38s) +21.459 (+21d 27' 31\")\n Corners:\n 291.869 (19h 27m 29s) +20.713 (+20d 42' 47\")\n 287.138 (19h 08m 33s) +22.071 (+22d 04' 17\")\n 286.938 (19h 07m 45s) +22.067 (+22d 04' 02\")\n 291.666 (19h 26m 40s) +20.731 (+20d 43' 50\")\n ---------------------------------------------\nThe error box area is 809 sq. arcmin, and its maximum\ndimension is 4.8 deg (the minimum one is 3 arcmin).\nThe Sun distance was 42 deg.\n\nThe IPN localization is consistent with, but reduces\nthe area of, the GECAM-B localization (GCN 35520).\nThe position of SGR 1935+2154 is outside the box.\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240112_T20481/IPN\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35554.",
"published": "2024-01-17T14:47:08.266407Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T14:47:08.266423Z",
"modified": "2024-01-17T14:47:08.274792Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5842,
"topic": "gcn.circular",
"uuid": "dc3672d1-d772-4af8-8756-91e83ea0171e",
"title": "Swift Triggers 1209401 and 1209403 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>",
"data": {
"date": "24/01/17 16:50:04 GMT",
"from": "Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35555"
},
"title": "GCN CIRCULAR",
"number": "35555",
"subject": "Swift Triggers 1209401 and 1209403 are not astrophysical events"
},
"message_text": "\nK. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1209401 and 1209403 were caused by a star tracker\nloss of lock, and are not astrophysical events. We also note\nthat trigger 1209398, classed as matching GX 301-2 in the ground\ncatalogue, was also related to the loss of lock, and is not an\ninteresting event.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35555.",
"published": "2024-01-17T16:50:19.453742Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T16:50:19.453758Z",
"modified": "2024-01-17T16:50:19.462199Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5844,
"topic": "gcn.circular",
"uuid": "ca8f3493-03e7-47a2-b198-a292747f7d39",
"title": "GRB 240115A: Swift/BAT-GUANO detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/01/17 21:20:29 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35557"
},
"title": "GCN CIRCULAR",
"number": "35557",
"subject": "GRB 240115A: Swift/BAT-GUANO detection of a short burst"
},
"message_text": "James DeLaunay (PSU), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240115A onboard (T0: 2024-01-15T11:03:14.11 UTC, Fermi GBM Trig 727009399, INTEGRAL SPI-ACS Trig 10471).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 7.5 in a 1.024 s analysis time bin, starting at T0 - 0.256 s.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 5.4.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35557.",
"published": "2024-01-17T21:20:40.797975Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-17T21:20:40.798006Z",
"modified": "2024-01-17T21:20:40.816205Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5845,
"topic": "gcn.circular",
"uuid": "bb812c45-b465-4d97-afcd-f433fb577dbb",
"title": "GRB 240118A: 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": "24/01/18 01:58:38 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35558"
},
"title": "GCN CIRCULAR",
"number": "35558",
"subject": "GRB 240118A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 01:48:09 UT on 18 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240118A (trigger 727235294.440514 / 240118075).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 14.1, Dec = 30.9 (J2000 degrees, equivalent to J2000 00h 56m, 30d 53'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 63.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118075/quicklook/glg_skymap_all_bn240118075.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/2024/bn240118075/quicklook/glg_healpix_all_bn240118075.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118075/quicklook/glg_lc_medres34_bn240118075.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35558.",
"published": "2024-01-18T01:58:49.516253Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T01:58:49.516303Z",
"modified": "2024-01-18T01:58:49.523866Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6564,
"topic": "gcn.circular",
"uuid": "50cd6d46-c505-4fa7-b1fc-f82d25e5204b",
"title": "EP240414a: Kinder optical counterpart candidate possibly associated with the galaxy SDSS J124601.99-094309.3",
"submitter": "Hop gcn.circular",
"authors": "Janet Chen at National Central University <janetstars@gmail.com>",
"data": {
"date": "24/04/14 17:15:21 GMT",
"from": "Janet Chen at National Central University <janetstars@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36094"
},
"title": "GCN CIRCULAR",
"number": "36094",
"subject": "EP240414a: Kinder optical counterpart candidate possibly associated with the galaxy SDSS J124601.99-094309.3"
},
"message_text": "A. Aryan (NCUIA), S. Yang (HNAS), T.-W. Chen, W.-J. Hou, C.-H. Lai, A. Sankar.K, Y.-C. Pan (all NCUIA), S. J. Smartt (Oxford/QUB), K. W. Smith (QUB), H.-Y. Hsiao, M.-H. Lee, C.-C. Ngeow, C.-S. Lin, H.-C. Lin, J.-K. Guo (all NCUIA), J. Gillanders, L. Rhodes, S. Srivastav (all Oxford), T. Moore and M. Fulton (both QUB) report:\n\nWe observed the field of EP240414a (Lian et al., GCN 36091) using the Lulin One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The first LOT epoch of observations started at 12:50 UT on 14 of April 2024 (MJD`414.535), 3.13 hours after the EP trigger.\n\nWe used the Kinder pipeline (Yang et al. A&A 646, A22) to stack the images and subtract the stacked images with the Legacy Survey DR10 template images. We detected an optical transient candidate in the difference image, at RA\u0012:46:01.7248, Dec=-9:43:08.872 (which is 1.56 arcmins away from the reported coordinate of EP240414a). We note an extended source in the Legacy Survey image, which is likely its host galaxy. We cross-matched it with the SDSS DR15 catalogue and found it could correspond to the galaxy, SDSS J124601.99-094309.3, with r-band magnitude as 19.04 mag.\n\nThe details of the observations and measured PSF magnitudes (in the AB system) of the possible counterpart of EP240414a are as follows:\n\nTelescope | Filter | MJD | t-t0 | Exposure | Magnitude | Seeing | Airmass\nLOT | r | 60414.535 | 3.13 hrs | 300 sec * 6 | 21.52 +/- 0.12 | 1\".7 | 1.31\nLOT | i | 60414.564 | 3.68 hrs | 300 sec * 6 | 21.40 +/- 0.16 | 1\".2 | 1.43\n\nThe presented magnitudes are calibrated using the field stars from the SDSS catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.03 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\nAccordint to SDSS, for the likely host galaxy, SDSS J124601.99-094309.3, its photo-z is 0.299 +/- 0.0426, and the distance module is then 40.80. Assuming r-band can be roughly k-corrected to g-band, with the Milky Way extinction correction, the optical counterpart candidate has the rest-frame M_g = -19.07 mag and M_r = -19.18 mag.\n\nWe are still continuously observing this source. Further follow-up observations are encouraged to identify the nature of this X-ray transient.\n\nWe thank the Einstein Probe team for useful communication.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36094.",
"published": "2024-04-14T17:15:37.439097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T17:15:37.439154Z",
"modified": "2024-04-14T17:15:37.447191Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6565,
"topic": "gcn.circular",
"uuid": "4408d5e3-ad2e-44bf-8ab5-942eded1a97d",
"title": "Swift GRB 240414A: 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": "24/04/14 17:28:49 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36095"
},
"title": "GCN CIRCULAR",
"number": "36095",
"subject": "Swift GRB 240414A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 240414A ( R. Caputo et al., GCN 36083) errorbox 53869 sec after notice time and 53925 sec after trigger time at 2024-04-14 17:19:21 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 32 deg. The sun altitude is -10.0 deg.\n\nThe galactic latitude b = 60 deg., longitude l = 131 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$22039\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 54015 | MASTER-Tavrida | C | 180 | 17.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36095.",
"published": "2024-04-14T17:29:03.679799Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T17:29:03.679816Z",
"modified": "2024-04-14T17:29:03.685638Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6566,
"topic": "gcn.circular",
"uuid": "43717912-b964-483b-ad4b-4031f002d5b7",
"title": "Fermi trigger No 734754044: 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": "24/04/14 18:16:23 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36096"
},
"title": "GCN CIRCULAR",
"number": "36096",
"subject": "Fermi trigger No 734754044: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240414.10 (trigger No 734754044,12h 54m 02.40s , +57d 51m 36.0s, R=3.96) errorbox 48782 sec after notice time and 53922 sec after trigger time at 2024-04-14 17:19:21 UT, with upper limit up to 19.3 mag. Observations started at twilight. The observations began at zenith distance = 32 deg. The sun altitude is -10.0 deg.\n\nThe galactic latitude b = 60 deg., longitude l = 122 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$22163\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 54013 | 2024-04-14 17:19:21 | MASTER-Tavrida | (12h 18m 36.39s , +56d 31m 40.5s) | C | 180 | 17.3 |\n 54202 | 2024-04-14 17:22:31 | MASTER-Tavrida | (12h 18m 43.41s , +56d 30m 34.6s) | C | 180 | 17.8 |\n 54390 | 2024-04-14 17:25:39 | MASTER-Tavrida | (12h 18m 37.02s , +56d 29m 28.4s) | C | 180 | 18.0 |\n 54579 | 2024-04-14 17:28:48 | MASTER-Tavrida | (12h 18m 44.97s , +56d 29m 42.2s) | C | 180 | 18.1 |\n 54766 | 2024-04-14 17:31:55 | MASTER-Tavrida | (12h 18m 41.70s , +56d 30m 50.3s) | C | 180 | 18.4 |\n 54954 | 2024-04-14 17:35:03 | MASTER-Tavrida | (12h 18m 42.08s , +56d 29m 26.0s) | C | 180 | 18.5 |\n 55142 | 2024-04-14 17:38:11 | MASTER-Tavrida | (12h 18m 44.93s , +56d 30m 38.4s) | C | 180 | 18.9 |\n 55987 | 2024-04-14 17:52:16 | MASTER-Tavrida | (12h 18m 43.36s , +56d 28m 58.8s) | C | 180 | 19.0 |\n 56119 | 2024-04-14 17:55:28 | MASTER-Tavrida | (12h 50m 52.83s , +57d 58m 14.3s) | C | 60 | 18.7 |\n 56191 | 2024-04-14 17:56:40 | MASTER-Tavrida | (12h 39m 26.02s , +56d 04m 10.8s) | C | 60 | 18.9 |\n 56264 | 2024-04-14 17:57:53 | MASTER-Tavrida | (13h 06m 54.60s , +56d 03m 19.4s) | C | 60 | 18.7 |\n 56397 | 2024-04-14 17:59:06 | MASTER-Tavrida | (12h 18m 46.23s , +56d 28m 03.8s) | C | 180 | 19.3 |\n 56536 | 2024-04-14 18:02:25 | MASTER-Tavrida | (13h 04m 22.84s , +59d 51m 11.8s) | C | 60 | 18.6 |\n 56610 | 2024-04-14 18:03:39 | MASTER-Tavrida | (12h 21m 54.58s , +57d 56m 58.8s) | C | 60 | 18.7 |\n 56683 | 2024-04-14 18:04:52 | MASTER-Tavrida | (12h 56m 14.50s , +54d 09m 56.6s) | C | 60 | 18.7 |\n 56756 | 2024-04-14 18:06:04 | MASTER-Tavrida | (12h 33m 53.97s , +59d 50m 25.3s) | C | 60 | 18.7 |\n 56828 | 2024-04-14 18:07:17 | MASTER-Tavrida | (12h 30m 02.29s , +54d 08m 29.0s) | C | 60 | 18.7 |\n 56901 | 2024-04-14 18:08:30 | MASTER-Tavrida | (12h 48m 01.01s , +61d 45m 20.5s) | C | 60 | 18.7 |\n 56974 | 2024-04-14 18:09:42 | MASTER-Tavrida | (13h 19m 49.18s , +57d 58m 10.5s) | C | 60 | 18.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36096.",
"published": "2024-04-14T18:16:40.283251Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T18:16:40.283268Z",
"modified": "2024-04-14T18:16:40.291439Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6567,
"topic": "gcn.circular",
"uuid": "bc2c07f7-f9d7-4e2c-acf5-4f343fbdf29f",
"title": "GRB 240414A: Skynet Optical Afterglow Observations",
"submitter": "Hop gcn.circular",
"authors": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"data": {
"date": "24/04/14 18:19:53 GMT",
"from": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36097"
},
"title": "GCN CIRCULAR",
"number": "36097",
"subject": "GRB 240414A: Skynet Optical Afterglow Observations"
},
"message_text": "Dylan Dutton, Megan Dubay, Ruide Fu, Donovan Schlekat, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daniel Caton, Lee Hawkins, Dean Glace, Daryl Janzen, Kim Janzen, James Davidson, Edward Murphy, and Carlos Salgado report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.\n\nWe observed the field of GRB 240414A with three of our North American robotic telescopes. The first detection occurred at 02:36:17 UTC on Apr 14 2024, approximately 15 minutes after the trigger reported by Swift (Caputo et al., GCN 36083).\n\nWe obtained multiple exposures in the B, V, and R filters. Exposure lengths were calculated using our automated exposure length scaling model.\n\nWe detect the optical afterglow with coordinates consistent to those reported by OHP/T193 (B. Schneider et al., GCN 36084).\n\nThe coordinates are:\nR.A. (J2000): 12:19:08.12\nDec. (J2000): 56:44:28.70\n\nWe report the photometry below. We estimate a temporal index of about -0.9 and spectral index of about -0.5.\n\nExpLen | Filter | Mag | Mag Error | MJD\n------------------------------------------------\n51.99 | B | 17.02 | 0.066 | 60414.108\n52.82 | V | 16.92 | 0.068 | 60414.110\n27.18 | R | 16.46 | 0.086 | 60414.111\n76.20 | V | 17.77 | 0.122 | 60414.115\n38.54 | R | 17.02 | 0.117 | 60414.117\n103.4 | B | 17.86 | 0.096 | 60414.120\n52.39 | R | 17.26 | 0.117 | 60414.124\n138.1 | V | 17.45 | 0.084 | 60414.128\n63.67 | R | 17.13 | 0.117 | 60414.130\n300 | R | 18.77 | 0.116 | 60414.204\n300 | R | 18.61 | 0.101 | 60414.207\n300 | V | 19.04 | 0.064 | 60414.208\n300 | V | 19.03 | 0.063 | 60414.208\n300 | R | 18.89 | 0.126 | 60414.211\n300 | V | 18.85 | 0.054 | 60414.211\n300 | V | 18.85 | 0.054 | 60414.211\n300 | R | 18.54 | 0.091 | 60414.214\n300 | V | 18.97 | 0.059 | 60414.215\n300 | V | 18.98 | 0.059 | 60414.215\n300 | R | 18.92 | 0.134 | 60414.218\n300 | V | 19.03 | 0.063 | 60414.218\n300 | V | 19.03 | 0.063 | 60414.218\n300 | R | 18.94 | 0.138 | 60414.221\n300 | V | 19.03 | 0.062 | 60414.222\n300 | V | 19.04 | 0.062 | 60414.222\n300 | R | 18.67 | 0.106 | 60414.225\n300 | V | 19.12 | 0.065 | 60414.225\n300 | V | 19.05 | 0.061 | 60414.225\n300 | R | 18.67 | 0.106 | 60414.228\n300 | V | 19.15 | 0.070 | 60414.229\n300 | V | 19.16 | 0.070 | 60414.229\n300 | R | 18.96 | 0.137 | 60414.232\n300 | V | 19.16 | 0.069 | 60414.233\n300 | V | 19.20 | 0.072 | 60414.233\n300 | R | 18.72 | 0.113 | 60414.236\n300 | V | 19.30 | 0.076 | 60414.236\n300 | V | 19.29 | 0.075 | 60414.236\n300 | V | 19.16 | 0.071 | 60414.240\n300 | V | 19.21 | 0.075 | 60414.240\n300x3 | R | 19.02 | 0.138 | 60414.243\n300x3 | R | 19.26 | 0.090 | 60414.295\n300x3 | R | 19.22 | 0.088 | 60414.306\n300x3 | R | 19.35 | 0.080 | 60414.316\n300x3 | R | 19.54 | 0.092 | 60414.327\n300x3 | R | 19.35 | 0.159 | 60414.337\n300x5 | R | 19.59 | 0.147 | 60414.351\n\nOur images have been calibrated using stars from the APASS catalog.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36097.",
"published": "2024-04-14T18:20:10.671628Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T18:20:10.671640Z",
"modified": "2024-04-14T18:20:10.678337Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5846,
"topic": "gcn.circular",
"uuid": "70906c79-5d8c-4e84-9a26-8e241f7f82f7",
"title": "GRID detection of GRB 231230A",
"submitter": "Hop gcn.circular",
"authors": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"data": {
"date": "24/01/18 04:50:00 GMT",
"from": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35559"
},
"title": "GCN CIRCULAR",
"number": "35559",
"subject": "GRID detection of GRB 231230A"
},
"message_text": "Chenyu Wang, Zirui Yang and Longhao Li report on behalf of the GRID Collaboration:\n\nGRID-04 reports the detection of the long-duration GRB 231230A, which was also detected by Swift/BAT and Fermi/GBM(GCN Circular 35434 and 35436).\n\nThe event was triggered with GRID on 2023-12-30 at 01:29:08â UTC. The GRID light curve consists of multiple spikes with a duration (T90) of about 17 +/- 1 s (30-2000 keV).\nThe time-averaged spectrum from T0+0.4 to T0+17.3 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.03 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 132 +/- 45 keV. The event fluence (10-1000 keV) in this time interval is about 6.0E-06 erg/cm^2.â\n\nThe GRID light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231230A/GRID_231230A_ltcv.pdf. The GRID spectrum of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB231230A/GRID_231230A_spec_cpl.pdf.\n\nGRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.ââ\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35559.",
"published": "2024-01-18T04:50:15.554672Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T04:50:15.554686Z",
"modified": "2024-01-18T04:50:15.562838Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5847,
"topic": "gcn.circular",
"uuid": "a62075aa-ff04-45e3-987e-50576cfb850d",
"title": "GRB 240118A: Fermi-LAT detection",
"submitter": "Hop gcn.circular",
"authors": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"data": {
"date": "24/01/18 09:58:01 GMT",
"from": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35560"
},
"title": "GCN CIRCULAR",
"number": "35560",
"subject": "GRB 240118A: Fermi-LAT detection"
},
"message_text": "E. Bissaldi (Politecnico and INFN Bari), F. Longo (University and INFN Trieste)\nand Makoto Arimoto (Kanazawa University) report on behalf of the Fermi-LAT Collaboration:\n\n\nAt 01:48:09.44 on January, 18, 2024 Fermi-LAT detected high-energy emission\nfrom GRB 240118A, which was also detected by Fermi-GBM (trigger 727235294 / 240118075,\nGCN #35558).\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 18.57, 29.79 (J2000)\n\nwith an error radius of 0.05 deg (90 % containment, statistical error only).\nThis was 69 deg from the LAT boresight at the time of the trigger.\n\nThe data from the Fermi-LAT show a significant increase in the event rate\nthat is spatially and temporally correlated with the trigger with high significance.\nThe photon flux above 100 MeV in the time interval 0-2000 s\nafter the GBM trigger time is (7.3 +/- 1.0)E-6 ph/cm2/s.\nThe estimated photon index above 100 MeV is -1.9 +/- 0.1.\nThe highest-energy photon is a 41 GeV event, which is observed\n732 seconds after the GBM trigger.\n\nA Swift ToO has been requested for this burst.\n\nThe Fermi-LAT point of contact for this burst is\nElisabetta Bissaldi (elisabetta.bissaldi@ba.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover\nthe energy band from 20 MeV to greater than 300 GeV.\nIt is the product of an international collaboration between\nNASA and DOE in the U.S. and many scientific institutions\nacross France, Italy, Japan and Sweden.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35560.",
"published": "2024-01-18T09:58:11.862686Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T09:58:11.862701Z",
"modified": "2024-01-18T09:58:11.869998Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5848,
"topic": "gcn.circular",
"uuid": "8e9f7b34-2343-46b4-a20f-3cca449a75ff",
"title": "LAT GRB240118.08: 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": "24/01/18 10:55:37 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35561"
},
"title": "GCN CIRCULAR",
"number": "35561",
"subject": "LAT GRB240118.08: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the LAT GRB240118.08 (trigger No 727235294,01h 14m 18.00s , +29d 47m 20.4s, R=0.05) errorbox 10304 sec after notice time and 31631 sec after trigger time at 2024-01-18 10:35:21 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 21 deg. The sun altitude is -9.7 deg.\n\nThe galactic latitude b = -32 deg., longitude l = 130 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#59238\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 31635 | 2024-01-18 10:35:21 | MASTER-Tunka | (01h 13m 06.36s , +29d 39m 31.5s) | C | 5 | 17.8 |\n 31652 | 2024-01-18 10:35:38 | MASTER-Tunka | (01h 13m 12.82s , +29d 38m 32.5s) | C | 5 | 17.8 |\n 31673 | 2024-01-18 10:35:58 | MASTER-Tunka | (01h 13m 08.08s , +29d 37m 33.4s) | C | 5 | 17.8 |\n 31714 | 2024-01-18 10:36:40 | MASTER-Tunka | (01h 13m 10.17s , +29d 37m 47.6s) | C | 5 | 17.8 |\n 31735 | 2024-01-18 10:37:01 | MASTER-Tunka | (01h 13m 12.22s , +29d 39m 24.1s) | C | 5 | 17.9 |\n 31777 | 2024-01-18 10:37:43 | MASTER-Tunka | (01h 13m 07.26s , +29d 39m 47.9s) | C | 5 | 17.9 |\n 31817 | 2024-01-18 10:38:23 | MASTER-Tunka | (01h 13m 08.69s , +29d 37m 54.6s) | C | 5 | 13.8 |\n 31831 | 2024-01-18 10:38:37 | MASTER-Tunka | (01h 13m 12.69s , +29d 38m 21.9s) | C | 5 | 17.8 |\n 31905 | 2024-01-18 10:39:51 | MASTER-Tunka | (01h 13m 07.30s , +29d 39m 58.4s) | C | 5 | 18.0 |\n 31986 | 2024-01-18 10:41:10 | MASTER-Tunka | (01h 13m 10.45s , +29d 38m 10.4s) | C | 10 | 18.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35561.",
"published": "2024-01-18T10:55:48.064015Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T10:55:48.064033Z",
"modified": "2024-01-18T10:55:48.075099Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
