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"results": [
{
"id": 5849,
"topic": "gcn.circular",
"uuid": "38e98863-cb2c-4d03-8ae2-4289cfb567cf",
"title": "GRB 240118B: 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 12:21:43 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35562"
},
"title": "GCN CIRCULAR",
"number": "35562",
"subject": "GRB 240118B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 12:11:05 UT on 18 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240118B (trigger 727272670.288166 / 240118508).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 49.8, Dec = -55.0 (J2000 degrees, equivalent to J2000 03h 19m, -55d 00'), with a statistical uncertainty of 7.1 degrees.\n\nThe angle from the Fermi LAT boresight is 44.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118508/quicklook/glg_skymap_all_bn240118508.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/bn240118508/quicklook/glg_healpix_all_bn240118508.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118508/quicklook/glg_lc_medres34_bn240118508.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35562.",
"published": "2024-01-18T12:21:53.999722Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T12:21:53.999740Z",
"modified": "2024-01-18T12:21:54.014957Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5850,
"topic": "gcn.circular",
"uuid": "4230ce2b-18ef-41f8-a242-f46976da17dd",
"title": "GRB 240118A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "rachel.hamburg@ijclab.in2p3.fr",
"data": {
"date": "24/01/18 16:07:47 GMT",
"from": "rachel.hamburg@ijclab.in2p3.fr",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35563"
},
"title": "GCN CIRCULAR",
"number": "35563",
"subject": "GRB 240118A: Fermi GBM Observation"
},
"message_text": "R. Hamburg (CNRS/IN2P3), S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 01:48:09.44 UT on 18 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240118A (trigger 727235294/240118075),\nwhich was also detected by Fermi-LAT (Bissaldi et al. 2024, GCN 35560).\nThe Fermi GBM on-ground location (GCN 35558) is consistent with the Fermi-LAT position.\n\nThe angle from the Fermi LAT boresight is 64 degrees.\n\nThe GBM light curve consists of multiple bright pulses with a duration (T90)\nof about 54 s (50-300 keV). The time-averaged spectrum\nfrom T0+0 s to T0+150 s is best fit by\na Band function with Epeak = 374 +/- 3 keV,\nalpha = -0.71 +/- 0.004, and beta = -2.35 +/- 0.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.81 +/- 0.01)E-04 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+72.5 s in the 10-1000 keV band is 94.6 +/- 0.5 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/35563.",
"published": "2024-01-18T16:08:02.888734Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T16:08:02.888749Z",
"modified": "2024-01-18T16:08:02.897245Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5851,
"topic": "gcn.circular",
"uuid": "70e56471-d7c9-4ddf-92d6-af5851d45da4",
"title": "GRB 240118A: NuSTAR Detection of a Long GRB",
"submitter": "Hop gcn.circular",
"authors": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"data": {
"date": "24/01/18 17:14:54 GMT",
"from": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35564"
},
"title": "GCN CIRCULAR",
"number": "35564",
"subject": "GRB 240118A: NuSTAR Detection of a Long GRB"
},
"message_text": "B. Grefenstette on behalf of the NuSTAR Search for INteresting Gamma-ray Signals (SINGS) working group:\n\nThe NuSTAR SINGS working group reports the detection of prompt emission of the GRB 240118A in the NuSTAR CsI anti-coincidence shields. Thus GRB was identified through a blind search using the CsI shield rates with a trigger time (2024-01-18 01:48:46). This is consistent with the time of the delayed large peak seen in the GBM lightcurve from Fermi GBM (Fermi Team GCN 35558, Hamburg GCN 35563) which arrives ~40-sec after the initial GBM trigger at 01:48:09. Data from the CdZnTe detectors have not yet been downloaded from the spacecraft.\n\nThe burst shows at least three broad peaks in the CsI shields from both NuSTAR FPMs, peaking at 3000-5000 counts per second (the background in the shields was roughly 1000 cps).\n\nThe automated light curve report for this GRB and discovery report can be found here:\n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/reports/2024/240118A/\n\nâ¦where further offline analysis will be performed once more data are downloaded from NuSTAR.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35564.",
"published": "2024-01-18T17:15:06.070796Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T17:15:06.070815Z",
"modified": "2024-01-18T17:15:06.078829Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5852,
"topic": "gcn.circular",
"uuid": "a6c448ff-14f5-414f-adaf-5e8102c7ff6d",
"title": "GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "24/01/18 17:59:26 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35565"
},
"title": "GCN CIRCULAR",
"number": "35565",
"subject": "GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)"
},
"message_text": "T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n727291408 at 17:23:23 on 18 Jan. 2024 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position is:\nRA(2000.0) = 305.3 deg\nDecl.(2000.0) = -9.8 deg\nThe 1 sigma statistical error radius is 1.6 deg.\nWe estimate an additional systematic error of 1 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB240118725/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB240118725/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB240118725/json\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35565.",
"published": "2024-01-18T17:59:37.028566Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T17:59:37.028581Z",
"modified": "2024-01-18T17:59:37.036484Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6568,
"topic": "gcn.circular",
"uuid": "a8e0eae8-01c7-4f70-ba44-a4c1a368abe2",
"title": "EP240413A: GOTO optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "kendall.ackley@warwick.ac.uk",
"data": {
"date": "24/04/14 20:04:34 GMT",
"from": "kendall.ackley@warwick.ac.uk",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36098"
},
"title": "GCN CIRCULAR",
"number": "36098",
"subject": "EP240413A: GOTO optical upper limits"
},
"message_text": "K. Ackley; B. P. Gompertz; P. O'Brien; G. Ramsay; A. Levan; R. Starling; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jimenez-Ibarra; A. Kumar; D. O'Neill; D. Steeghs; D. K. Galloway; V. Dhillon; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nThe Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) performed a targeted observation in response to the EP-WXT trigger EP240413A (Lian et al., GCN 36086) at 11:42:34 UT on 2024-04-14, starting approximately 21 hours after the EP-WXT trigger and 7 hours after EP-FXT follow-up observations (Li et al., GCN 36092). The observation consisted of a 6x60s exposure in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. No optical counterpart to the X-ray counterpart candidate detected by EP-FXT (Li et al., GCN 36092) is seen to a 3-sigma limit of L > 20.4 magnitudes (AB). The last visit to this field occurred at 14:27:11 on 2024-04-13, approximately 12 minutes before the EP-WXT trigger, providing a pre-detection 3-sigma limit of L > 21.1 magnitudes (AB).\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36098.",
"published": "2024-04-14T20:04:50.653793Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T20:04:50.653813Z",
"modified": "2024-04-14T20:04:50.665705Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5853,
"topic": "gcn.circular",
"uuid": "9324410b-2356-4c4a-b5ff-0e60e531c126",
"title": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A",
"submitter": "Hop gcn.circular",
"authors": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"data": {
"date": "24/01/18 18:27:40 GMT",
"from": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35566"
},
"title": "GCN CIRCULAR",
"number": "35566",
"subject": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A"
},
"message_text": "The AMON, IceCube, and HAWC collaborations report:\n\nThe AMON NuEm stream channel found a coincidence alert from the\nIceCube online neutrino selection + HAWC daily monitoring analysis.\nThe analysis looks for IceCube neutrino events -mostly atmospheric\nin origin- around the position and transit time of a HAWC cluster of\nlikely gamma rays, as identified in the integrated observations from\na single transit, in this case having a duration of 4.96 hours.\n\nThe HAWC transit interval starts from 2024/01/18 12:57:47 UT to\n2024/01/18 14:13:13 UT\n(End of the HAWC transit time)\n\nThe location of the coincidence is reported as\nRA (J2000): 257.73 deg\nDec (J2000): 53.78 deg\nLocation uncertainty (50% containment): 0.30 deg (statistical only).\nLocation uncertainty (90% containment): 0.55 deg (statistical only).\n\nThe false alarm rate (FAR) of this coincidence is 2.1 per year.\nWe encourage follow-up observations of the alert region contingent on\nthe availability of resources and interest, given the quoted FAR.\n\nAMON seeks to perform a real-time correlation analysis of the\nhigh-energy signals across all known astronomical messengers. More\ninformation about AMON can be found in https://www.amon.psu.edu/\nInformation on the IceCube collaboration: http://icecube.wisc.edu/\nInformation on the HAWC collaboration: https://www.hawc-observatory.org\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35566.",
"published": "2024-01-18T18:27:51.914166Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T18:27:51.914181Z",
"modified": "2024-01-18T18:27:51.924879Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5854,
"topic": "gcn.circular",
"uuid": "b372d8f5-c84e-4162-a7b8-d9a6e3ee7060",
"title": "Konus-Wind detection of GRB 240118A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "24/01/18 18:44:56 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35567"
},
"title": "GCN CIRCULAR",
"number": "35567",
"subject": "Konus-Wind detection of GRB 240118A"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long, very bright GRB 240118A\n(Fermi GBM observation: Hamburg et al., GCN 35563;\nFermi LAT detection: Bissaldi et al., GCN 35560;\nNuSTAR detection: Grefenstette, GCN 35564)\ntriggered Konus-Wind (KW) at T0=6508.107 s UT (01:48:28.107).\n\nThe burst light curve shows a multi-peaked structure,\nwhich starts at ~T0-2.4 s, peaks at ~T0+37.5 s,\nand has a total duration of ~90 s.\nThe emission is seen up to ~15 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240118_T06508/\n\nAs observed by Konus-Wind, the burst had\na fluence of (8.24 ± 0.38)x10^-4 erg/cm^2 and\na 64-ms peak energy flux, measured from T0 + 37.568 s,\nof (6.65 ± 0.63)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0 to T0+90.880 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.69 (-0.03,+0.03),\nthe high energy photon index beta = -2.37 (-0.05,+0.05),\nthe peak energy Ep = 402 (-12,+13) keV,\nchi2 = 167/97 dof.\n\nThe spectrum near the peak count rate (measured from T0+36.352 s to T0+38.144 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.61 (-0.06,+0.07),\nthe high energy photon index beta = -2.62 (-0.21,+0.15),\nthe peak energy Ep = 634 (-51,+55) keV,\nchi2 = 74/66 dof.\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35567.",
"published": "2024-01-18T18:45:06.694638Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T18:45:06.694668Z",
"modified": "2024-01-18T18:45:06.703570Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5855,
"topic": "gcn.circular",
"uuid": "fdca8692-d99e-4f07-8de6-06f113745579",
"title": "GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/01/18 21:03:45 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35568"
},
"title": "GCN CIRCULAR",
"number": "35568",
"subject": "GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV"
},
"message_text": "James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240118A onboard (T0: 2024-01-18T01:48:09.44 UTC, Fermi trig 727235294, Konus-Wind GCN 35567, NuSTAR GCN 35564)\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+32 s, T0+72 s] (centered around the peak count rate), detects the burst with a sqrt(TS) of 125.5 in a 16.384 s analysis time bin, starting at T0 + 43.808.\n\nNITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -930.9.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35568.",
"published": "2024-01-18T21:03:56.621923Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T21:03:56.621940Z",
"modified": "2024-01-18T21:03:56.629722Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5857,
"topic": "gcn.circular",
"uuid": "b2e9d0d9-2b6e-4d07-8423-cbeb9be9f990",
"title": "GRB 240118A: NuSTAR Offline Analysis of the GRB",
"submitter": "Hop gcn.circular",
"authors": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"data": {
"date": "24/01/18 21:58:42 GMT",
"from": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35570"
},
"title": "GCN CIRCULAR",
"number": "35570",
"subject": "GRB 240118A: NuSTAR Offline Analysis of the GRB"
},
"message_text": "B. Grefenstette on behalf of the NuSTAR Search for INteresting Gamma-ray Signals (SINGS) working group:\n\nThe NuSTAR SINGS working group has performed additional offline analysis of the GRB 240118A detected by Fermi (Hamburg, GCN 35563), Swift BAT (DeLaunay, GCN 35568), and Konus-Wind (Frederiks, GCN 35567). Using the localization from the Fermi LAT (Bissaldi, GCN 35560) we estimate that the GRB was only ~12-degrees from the telescope boresight at 2024-01-18T01:48:09.\n\nThe CsI shields do not clearly detect the precursor event that triggered the GBM at 2024-01-18T01:48:09. However, there are multiple strong peaks ~40-sec later. We have updated the automated GRB report to include the recently downloaded X-ray data here:\n\nhttps://nustarsoc.caltech.edu/NuSTAR_Public/grbs/reports/2024/240118A/\n\nThis includes enhanced light curves showing 1-Hz CsI anticoincidence shield data as well as the CdZnTe X-ray data binned at 2-s intervals. The shield data clearly resolves the GRB into at least three main peaks with significant substructure. All three peaks are also seen in the X-ray detectors, with excess counts that extend up to at least 200 keV.\n\nHowever, the response files of the detectors is complicated due to the intervening material so detailed spectroscopic analysis of the individual bursts cannot be performed at this time.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35570.",
"published": "2024-01-18T21:58:52.935550Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-18T21:58:52.935577Z",
"modified": "2024-01-18T21:58:52.946002Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5858,
"topic": "gcn.circular",
"uuid": "fc44f64a-ab02-4d10-96e5-eccf30ff8614",
"title": "Fermi GRB 240118B: 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": "24/01/19 00:31:43 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35571"
},
"title": "GCN CIRCULAR",
"number": "35571",
"subject": "Fermi GRB 240118B: 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 240118B ( Fermi GBM team, GCN 35562) errorbox 43321 sec after notice time and 43354 sec after trigger time at 2024-01-19 00:13:40 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -33.7 deg.\n\nThe galactic latitude b = -51 deg., longitude l = 269 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#59396\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 43385 | 2024-01-19 00:13:40 | MASTER-SAAO | (03h 19m 56.04s , -54d 00m 56.6s) | C | 60 | 18.4 |\n 43476 | 2024-01-19 00:15:11 | MASTER-SAAO | (03h 30m 18.84s , -53d 48m 55.0s) | C | 60 | 18.3 |\n 43476 | 2024-01-19 00:15:11 | MASTER-SAAO | (03h 33m 26.11s , -54d 01m 50.8s) | C | 60 | 18.1 |\n 43556 | 2024-01-19 00:16:31 | MASTER-SAAO | (03h 06m 29.36s , -55d 42m 49.0s) | C | 60 | 18.5 |\n 43556 | 2024-01-19 00:16:31 | MASTER-SAAO | (03h 09m 45.21s , -55d 55m 46.4s) | C | 60 | 18.5 |\n 43636 | 2024-01-19 00:17:51 | MASTER-SAAO | (03h 33m 30.51s , -55d 40m 53.5s) | C | 60 | 18.1 |\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/35571.",
"published": "2024-01-19T00:31:54.834747Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T00:31:54.834760Z",
"modified": "2024-01-19T00:31:54.841401Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5859,
"topic": "gcn.circular",
"uuid": "39cbcecf-3b86-44cf-8a1a-4574a16564df",
"title": "GRB 240118A: AbAO optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/19 01:25:42 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35572"
},
"title": "GCN CIRCULAR",
"number": "35572",
"subject": "GRB 240118A: AbAO optical upper limit"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), S. Belkin (IKI) report on behalf of IKI GRB FuN:\n\nWe observed the field of Fermi LAt localization of GRB 240118A (Bissaldi, GCN 35560) and detected also Fermi GBM (Fermi GBM team, GCN 35558; Hamburg, GCN 35563), NuSTAR (Grefenstette, GCN 35564), Swift BAT (DeLaunay, GCN 35568), and Konus-Wind (Frederiks, GCN 35567) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter starting on 2024-01-18 (UT) 16:47:55. No optical candidate is detected in the LAT localization area (Bissaldi, GCN 35560). Preliminary photometry of the filed is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2024-01-18 16:47:55 0.625069 R 40*60 n/d n/d 17.4\n\nThe photometry is based on nearby USNO-B1.0 stars.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35572.",
"published": "2024-01-19T01:25:52.867925Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T01:25:52.867953Z",
"modified": "2024-01-19T01:25:52.876110Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5860,
"topic": "gcn.circular",
"uuid": "a37b5fcd-63f3-476c-8590-3d842dc656a2",
"title": "GRB 240118A: Swift ToO observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/19 04:29:59 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35573"
},
"title": "GCN CIRCULAR",
"number": "35573",
"subject": "GRB 240118A: Swift ToO observations"
},
"message_text": "P. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a ToO observation of the Fermi/LAT GRB 240118A.\nAutomated analysis of the XRT data will be presented online at\nhttps://www.swift.ac.uk/ToO_GRBs/00021644\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. These are\nnot necessarily related to the Fermi/LAT event. Any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a\nGCN Circular after manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35573.",
"published": "2024-01-19T04:30:13.737699Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T04:30:13.737727Z",
"modified": "2024-01-19T04:30:13.746968Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6569,
"topic": "gcn.circular",
"uuid": "938cd8e8-0ea3-4444-9fd6-8297c1609c0c",
"title": "LIGO/Virgo/KAGRA S240413p: No Counterparts in DDOTI/OAN Optical Observations",
"submitter": "Hop gcn.circular",
"authors": "Rosa L. Becerra at Tor Vergata, Roma <rbecerra@astro.unam.mx>",
"data": {
"date": "24/04/14 20:37:50 GMT",
"from": "Rosa L. Becerra at Tor Vergata, Roma <rbecerra@astro.unam.mx>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36099"
},
"title": "GCN CIRCULAR",
"number": "36099",
"subject": "LIGO/Virgo/KAGRA S240413p: No Counterparts in DDOTI/OAN Optical Observations"
},
"message_text": "Rosa L. Becerra (Tor Vergata, Roma), Alan M. Watson (UNAM), Eleonora Troja (Tor Vergata, Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), William H. Lee (UNAM), Alexander Kutyrev (GSFC/UMD), Tsvetelina Dimitrova (ASU), Keneth Garcia Cifuentes (UNAM), Camila Angulo Valdez (UNAM), Margarita Pereyra (UNAM) and Océlotl Lopez (UNAM) report:\n\nWe observed LIGO/Virgo/KAGRA S240413p (GCN #36075) with the DDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2024-04-13 UTC.\n\nWe tiled the LVKC localization with one pointing centred on 165.541667 +11.866667 (J2000). The combined field covers about 48 square degrees and includes about 41% of the probability in the current BAYESTAR map. \n\nWe observed from 2024-04-13 05:58 UTC to 2024-04-13 09:29 UTC (from T+3.6 to\nT+7.1 hours after the event) obtaining exposures of 2.4 hours across\nthe field in the w filter, with 10-sigma limiting magnitudes of w = 20.2 to\nw = 20.9. \n\nComparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogs we\ndetect no uncatalogued sources within the observed field to our 10-sigma\nlimit. We observe the galaxy WISEA J105644.96+105455.6 (GCN #36080) without any evidence of flare activity.\n\nFurther observations are planned.\n\nWe thank the staff of the Observatorio Astronomico Nacional in San Pedro\nMartir.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36099.",
"published": "2024-04-14T20:38:05.889385Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T20:38:05.889403Z",
"modified": "2024-04-14T20:38:05.897167Z",
"nonlocalizedevents": [
{
"event_id": "S240413p"
}
],
"targets": []
},
{
"id": 5861,
"topic": "gcn.circular",
"uuid": "d6787cb6-22ce-40cd-a542-8d578f063b0d",
"title": "GRB 240117A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/19 04:56:39 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35574"
},
"title": "GCN CIRCULAR",
"number": "35574",
"subject": "GRB 240117A: 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 240117A which was also detected by Calet (Trigger Num. 1389556167), Integral-SPIACS (Trigger Num. 10476), and Glowbug (Cheung et al., GCN Circ. 35569).\n\nThe source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-17 19:52:36.50 UTC. The measured peak count rate associated with the burst is 156 (+35, -30) counts/s above the background in the combined data of three quadrants (out of four), with a total of 451 (+136, -161) counts. The local mean background count rate was 292 (+4, -3) counts/s. Using cumulative rates, we measure a T90 of 3.62 (+3.5, -1.6) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-17 19:52:35.72 UTC. The measured peak count rate associated with the burst is 208 (+80, -23) counts/s above the background in the combined data of three quadrants (out of four), with a total of 937 (+206, -219) counts. The local mean background count rate was 1475 (+7, -8) counts/s. We measure a T90 of 5.13 (+0.54, -1.39) 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/35574.",
"published": "2024-01-19T04:56:49.611608Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T04:56:49.611624Z",
"modified": "2024-01-19T04:56:49.620803Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5862,
"topic": "gcn.circular",
"uuid": "32bf3869-fb93-440c-892f-e5ff471f6c9c",
"title": "GRB 240118D: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/19 06:44:00 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35575"
},
"title": "GCN CIRCULAR",
"number": "35575",
"subject": "GRB 240118D: 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 240118D which was also detected by INTEGRAL-SPI-ACS (Trigger Num. 10478).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-18 07:48:13.55 UTC. The measured peak count rate associated with the burst is 351 (+165, -33) counts/s above the background in the combined data of all quadrants, with a total of 584 (+142, -136) counts. The local mean background count rate was 323 (+7, -10) counts/s. Using cumulative rates, we measure a T90 of 4 (+1, -1) s. We also see a faint second extended peak, consistent with the light curve from INTEGRAL-SPI-ACS, which is more prominently seen in the Veto detectors as reported below.\n\nThe source was also 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 2024-01-18 07:48:12.73 UTC. The measured peak count rate associated with the burst is 1088 (+90, -49) counts/s above the background in the combined data of all quadrants, with a total of 5639 (+649, -701) counts. The local mean background count rate was 1402 (+6, -7) counts/s. We measure a T90 of 30 (+7, -4) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35575.",
"published": "2024-01-19T06:44:11.434538Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T06:44:11.434553Z",
"modified": "2024-01-19T06:44:11.441255Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6570,
"topic": "gcn.circular",
"uuid": "62f201a5-80a1-443f-af03-b0b013a9766a",
"title": "GRB 240414A: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT",
"submitter": "Hop gcn.circular",
"authors": "I. Peretto at MarSEC (Marana Space Explorer Center) <ricerca@marsec.org>",
"data": {
"date": "24/04/14 21:27:52 GMT",
"from": "I. Peretto at MarSEC (Marana Space Explorer Center) <ricerca@marsec.org>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36100"
},
"title": "GCN CIRCULAR",
"number": "36100",
"subject": "GRB 240414A: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT"
},
"message_text": "Ivo Peretto (MarSEC, Marana Space Explorer Center, Marana Di Crespadoro, VI, Italy)\n\nMember of:\nUAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section.\nAAVSO (American Association Variable Stars Observers)\n\nIn collaboration with: Stefano Lora and Giovanni Furlato (MarSEC, Marana Space Explorer Center, Marana di Crespadoro, VI, Italy) \n\nreport:\nWe imaged the field of GRB 240414A detected by SWIFT(trigger=1221714)\nwith the telescope 14â RC Officine Stellari of MarSEC (Marana Space Explorer Center).\n\nThe observations with a series of 120 sec exposures started at 2024-01-01 18:18 UT, 958 min. after the GRB trigger, with a Ritchey-Chretien telescope D=360 mm f/ 8.\n\nat the following position:\n\nRA(J2000) = 12h 19m 09s\nDec(J2000) = +56d 43' 37\"\n\n\nWeather conditions were medium with Moon illuminated 40,5%.\n\nWe co-added 30 exposures of 120 sec each.\n\nStart T0+ End T0+ R lim.\n 958 min 1018 min 20.82\n\nWe did not found any optical counterpart in A.R. 12 19 09, DEC. +56 43 37 position and in the error box of the XRT candidate.\nref.: GCN Circular 36083\n\nMagnitudes were estimated with the APASS and\nare not corrected for galactic dust extinction.\n\nReference:\nhttps://www.marsec.org/\n\nThe message may be cited. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36100.",
"published": "2024-04-14T21:28:07.934395Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T21:28:07.934411Z",
"modified": "2024-04-14T21:28:07.942318Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5863,
"topic": "gcn.circular",
"uuid": "d20f5c36-a616-49c5-9c93-9260f7fb0438",
"title": "GRB 240118C: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "rachel.hamburg@ijclab.in2p3.fr",
"data": {
"date": "24/01/19 14:09:25 GMT",
"from": "rachel.hamburg@ijclab.in2p3.fr",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35576"
},
"title": "GCN CIRCULAR",
"number": "35576",
"subject": "GRB 240118C: Fermi GBM Final Localization"
},
"message_text": "V. Sharma (NASA-GSFC/UMBC) and R. Hamburg (CNRS/IN2P3) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\nAt 17:23:23.93 UT on 18 January 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240118C (trigger 727291408/240118725).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 305.33, Dec = -12.39 (J2000 degrees, equivalent to J2000 20h 21m, 12d 23'), with a statistical uncertainty of 1.8 degrees.\n\nThe angle from the Fermi LAT boresight is 90.00 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118725/quicklook/glg_skymap_all_bn240118725.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/bn240118725/quicklook/glg_healpix_all_bn240118725.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240118725/quicklook/glg_lc_medres34_bn240118725.gif\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35576.",
"published": "2024-01-19T14:09:35.087824Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T14:09:35.087839Z",
"modified": "2024-01-19T14:09:35.300080Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5864,
"topic": "gcn.circular",
"uuid": "5a4c7af0-1025-4742-9026-eeee2477a72c",
"title": "Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/01/19 14:33:14 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35577"
},
"title": "GCN CIRCULAR",
"number": "35577",
"subject": "Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events"
},
"message_text": "\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift triggers 1209631, 1209632, 1209635 and 1209644 (trigger times between\n2024-01-19 11:57 and 13:19 UT) were caused by a 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/35577.",
"published": "2024-01-19T14:33:25.665474Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T14:33:25.665497Z",
"modified": "2024-01-19T14:33:25.672250Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5865,
"topic": "gcn.circular",
"uuid": "05567c19-0b60-428d-ac55-45713225c855",
"title": "GRB 240115A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "rachel.hamburg@ijclab.in2p3.fr",
"data": {
"date": "24/01/19 15:36:32 GMT",
"from": "rachel.hamburg@ijclab.in2p3.fr",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35578"
},
"title": "GCN CIRCULAR",
"number": "35578",
"subject": "GRB 240115A: Fermi GBM Observation"
},
"message_text": "R. Hamburg (CNRS/IN2P3) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 11:03:14.11 UT on 15 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240115A (trigger 727009399/240115461),\nwhich was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35557).\nThe Fermi Final Real-time Localization is reported in GCN 35537.\n\nThe angle from the Fermi LAT boresight is 37 degrees.\n\nThe GBM light curve consists of one main pulse with a duration (T90)\nof about 1.79 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.26 to T0+0.77 s is best fit by a power law function\nwith an exponential high-energy cutoff.\nThe power law index is -0.7 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 450 +/- 137 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.8 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.64 s in the 10-1000 keV band is 3.4 +/- 1.0 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/35578.",
"published": "2024-01-19T15:36:49.531206Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T15:36:49.531220Z",
"modified": "2024-01-19T15:36:49.539092Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6571,
"topic": "gcn.circular",
"uuid": "a64fbbcb-a729-494e-972c-c19672f4410e",
"title": "GRB 240414A : OHP/T193 second epoch of optical follow-up and afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"data": {
"date": "24/04/14 21:59:49 GMT",
"from": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36101"
},
"title": "GCN CIRCULAR",
"number": "36101",
"subject": "GRB 240414A : OHP/T193 second epoch of optical follow-up and afterglow detection"
},
"message_text": "D. Turpin (CEA Paris-Saclay), B. Schneider (MIT), C. Adami, Ny Avo Rakotondrainibe, Olivier Ilbert, S. Basa (LAM/Pytheas/AMU), A. de Ugarte Postigo (OCA/LAM), E. Le Floc'h (CEA Paris-Saclay), S. D. Vergani (GEPI, Obs. de Paris), report on behalf of a larger collaboration:\n\nWe performed a second epoch of observation of the GRB 240414A afterglow candidate (Caputo et al., GCN 36083, Schneider et al. GCN 36084, Dutton et al. GCN 36097) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. After stacking 8 r-band images (total exp = 4080sec), we clearly detect the optical afterglow with the following preliminary magnitude:\n-----------------------------------------------\nT-T0 (in days, midtime) | mag | filter\n-----------------------------------------------\n0.7397 | 21.84 ± 0.16 mag (AB) | r'\n-----------------------------------------------\n\nWe also report the g-band magnitude of the afterglow for the previous night (2x120s):\n-----------------------------------------------\nT-T0 (in days, midtime) | mag | filter\n-----------------------------------------------\n0.0645 | 18.39 ± 0.03 mag (AB) | g'\n-----------------------------------------------\nBased on our two epochs in r-band, we obtain a temporal slope alpha ~ -1.1 which is roughly consistent with the one of Dutton et al. GCN 36097.\n\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/36101.",
"published": "2024-04-14T22:00:03.149915Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T22:00:03.149933Z",
"modified": "2024-04-14T22:00:03.157185Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5866,
"topic": "gcn.circular",
"uuid": "381cc5b1-80ad-4ef2-8e24-9c1b2d016107",
"title": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization",
"submitter": "Hop gcn.circular",
"authors": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"data": {
"date": "24/01/19 16:54:37 GMT",
"from": "Hugo Ayala at Pennsylvania State University <hgayala@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35579"
},
"title": "GCN CIRCULAR",
"number": "35579",
"subject": "AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization"
},
"message_text": "\nHugo Alberto Ayala Solares <hgayala@psu.edu>\n11:42â¯a.m. (hace 4 minutos)\n\npara gcncirc\n\nThe AMON, IceCube, and HAWC collaborations report:\n\nThe alert NuEM 240118A announced in GCN #35566 had \nan error in the localization of the coincidence for the RA coordinate.\n\nThe corrected values are:\n\nThe location of the coincidence is reported as\nRA (J2000): 251.73 deg\nDec (J2000): 53.78 deg\nLocation uncertainty (50% containment): 0.30 deg (statistical only).\nLocation uncertainty (90% containment): 0.55 deg (statistical only).\n\nWe take advantage of this correction to mention that a 4FGL catalog source, \nJ1649.4+5235 is 1deg away from the coincidence.\n\nAMON seeks to perform a real-time correlation analysis of the\nhigh-energy signals across all known astronomical messengers. More\ninformation about AMON can be found in https://www.amon.psu.edu/\nInformation on the IceCube collaboration: http://icecube.wisc.edu/\nInformation on the HAWC collaboration: https://www.hawc-observatory.org\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35579.",
"published": "2024-01-19T16:54:51.497848Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T16:54:51.497879Z",
"modified": "2024-01-19T16:54:51.507761Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5867,
"topic": "gcn.circular",
"uuid": "d9d6ca40-0aa4-421c-a4ba-68cc6bf412d6",
"title": "GRB 240118A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/19 17:40:49 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35580"
},
"title": "GCN CIRCULAR",
"number": "35580",
"subject": "GRB 240118A: 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 bright long-duration GRB 240118A (Fermi/GBM detection: GCN 35558; Fermi/LAT detection: GCN 35560; NuSTAR detection: GCN 35564; Konus/Wind detection: GCN 35567; Swift/BAT detection: GCN 35522; INTEGRAL/SPI-ACS detection: trigger no. 10477) 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 2024-01-18 01:49:22 UTC. The T90 duration measured by GRBAlpha is 58 s and the overall significance during T90 reaches 174 sigma.\n\nThe light curve shows a multiple-peaked structure which is consistent with light curves observed by other missions. However, GRBAlpha was passing through the van Allen radiation belt during the entire burst duration and therefore the measured count rate is subject to a higher variable background which cannot be distinguished from the burst itself.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240118A_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/35580.",
"published": "2024-01-19T17:41:00.289340Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T17:41:00.289352Z",
"modified": "2024-01-19T17:41:00.318659Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5870,
"topic": "gcn.circular",
"uuid": "94795fae-962a-4bbb-afac-2ebad86036d3",
"title": "GRB 240119A: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>",
"data": {
"date": "24/01/19 21:51:28 GMT",
"from": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35583"
},
"title": "GCN CIRCULAR",
"number": "35583",
"subject": "GRB 240119A: Fermi GBM Final Localization"
},
"message_text": "\"The Fermi GBM team reports the detection of a likely SHORT GRB:\n\nAt 17:29:07.68 UT on 19 January 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240119A (trigger 727378152/240119729).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 152.7, Dec = -83.6 (J2000 degrees, equivalent to J2000 10h 10m, 83d 36'), with a statistical uncertainty of 5.1 degrees.\n\nThe angle from the Fermi LAT boresight is 153.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240119729/quicklook/glg_skymap_all_bn240119729.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/bn240119729/quicklook/glg_healpix_all_bn240119729.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240119729/quicklook/glg_lc_medres34_bn240119729.gif.\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35583.",
"published": "2024-01-19T21:51:39.166318Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T21:51:39.166337Z",
"modified": "2024-01-19T21:51:39.172149Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5873,
"topic": "gcn.circular",
"uuid": "04b0ef85-6700-41a6-9a7c-d2af7d0cf251",
"title": "GRB 240118C: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>",
"data": {
"date": "24/01/20 01:01:56 GMT",
"from": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35586"
},
"title": "GCN CIRCULAR",
"number": "35586",
"subject": "GRB 240118C: Fermi GBM Observation"
},
"message_text": "V. Sharma (NASA-GSFC/UMBC) and C. Meegan (UAH) report on behalf of the\nFermi Gamma-ray Burst Monitor Team:\n\n\"At 17:23:23.93 UT on 18 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240118C (trigger 727291408/240118725), which was also\ndetected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35581).\nThe Fermi Final Real-time Localization is reported in GCN 35576.\n\nThe angle from the Fermi LAT boresight is 90 degrees.\n\nThe GBM light curve consists of multiple pulses with a duration (T90)\nof about 31 s (50-300 keV). The time-averaged spectrum from\nT0-0.6 to T0+32.5 s is best fit by a power law function with\nan exponential high-energy cutoff.\nThe power law index is -1.39 +/- 0.03 and the cutoff energy,\nparameterized as Epeak, is 144 +/- 10 keV.\n\nThe event fluence (10-1000 keV) in this time interval is (1.23 +/- 0.04)E-05 erg/cm^2.\nThe 1-sec peak photon flux measured starting from T0+29.7 s in the 10-1000 keV band\nis 13.6 +/- 0.5 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/35586.",
"published": "2024-01-20T01:02:06.903504Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-20T01:02:06.903524Z",
"modified": "2024-01-20T01:02:06.909925Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5874,
"topic": "gcn.circular",
"uuid": "3b7e0304-09d8-4993-aabb-3cd1b6c1752a",
"title": "GRB 240118A: Swift-XRT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/20 22:41:31 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35587"
},
"title": "GCN CIRCULAR",
"number": "35587",
"subject": "GRB 240118A: Swift-XRT afterglow detection"
},
"message_text": "A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi\n(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), A. Tohuvavohu (U. Toronto),\nD.N. Burrows (PSU), J. D. Gropp (PSU), J.P. Osborne (U. Leicester) and\nP.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/LAT-detected burst GRB 240118A, collecting 4.7 ks of Photon\nCounting (PC) mode data between T0+96.2 ks and T0+109.0 ks.\n\nTwo uncatalogued X-ray sources are detected consistent with being\nwithin 296 arcsec of the Fermi/LAT position, of which one (\"Source 3\")\nis believed to be the afterglow. Using 4697 s of PC mode data and 3\nUVOT images, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 18.53587, +29.79798 which is equivalent to:\n\nRA (J2000): 01h 14m 08.61s\nDec(J2000): +29d 47' 52.7\"\n\nwith an uncertainty of 2.7 arcsec (radius, 90% confidence). This\nposition is 2.1 arcmin from the Fermi/LAT position. The light curve is\nconsistent with a constant source of mean count rate 3.6e-02 ct/sec. A\npower-law fit gives an index of 1.9 (+1.0, -2.8).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.2 (+/-0.6). The\nbest-fitting absorption column is 1.1 (+0.8, -0.6) x 10^22 cm^-2, in\nexcess of the Galactic value of 7.1 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 4.5 x 10^-11 (9.9 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.1 (+0.8, -0.6) x 10^22 cm^-2\nGalactic foreground: 7.1 x 10^20 cm^-2\nExcess significance: 3.1 sigma\nPhoton index:\t 2.2 (+/-0.6)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021644.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021644.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35587.",
"published": "2024-01-20T22:41:45.820730Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-20T22:41:45.820743Z",
"modified": "2024-01-20T22:41:45.829135Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5910,
"topic": "gcn.circular",
"uuid": "8c7a5e42-6e3e-4ace-bbb6-52173bb8e802",
"title": "GRB 240123A: Mondy continued optical observations and the PL decay index",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/24 15:44:05 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35620"
},
"title": "GCN CIRCULAR",
"number": "35620",
"subject": "GRB 240123A: Mondy continued optical observations and the PL decay index"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe continued to observe the afterglow of GRB 240123A (D'Ai et al., GCN 35602; Pankov et al., GCN 35605, GCN 35609; Sasada et al., GCN 35618; Moskvitin at al., GCN 35619) with AZT-33IK telescope of Mondy observatory in R-filter.\n\nUsing previously reported photometry (Pankov et al., GCN 35605, GCN 35609; Moskvitin at al., GCN 35619) and photometry obtained on t-T0 0.400722 we approximate the light curve with a PL model with the index of PL alpha = -1.1, see Figure at\nhttp://grb.rssi.ru/GRB240123A/GRB240123A_LC_approximation.jpg\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35620.",
"published": "2024-01-24T15:44:20.048020Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T15:44:20.048038Z",
"modified": "2024-01-24T15:44:20.055530Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5868,
"topic": "gcn.circular",
"uuid": "b06217aa-f0a3-434a-aa70-52da9c63ac00",
"title": "GRB 240118C: Swift/BAT-GUANO detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/01/19 18:12:06 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35581"
},
"title": "GCN CIRCULAR",
"number": "35581",
"subject": "GRB 240118C: Swift/BAT-GUANO detection of a 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 240118C onboard (T0: 2024-01-18T17:23:23.93 UTC, Fermi GBM Trig 727291408, INTEGRAL SPI-ACS Trig 10480).\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 10.2 in a 16.384 s analysis time bin, starting at T0 + 12.288 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 9.6.\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/35581.",
"published": "2024-01-19T18:12:17.238449Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T18:12:17.238465Z",
"modified": "2024-01-19T18:12:17.248439Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5869,
"topic": "gcn.circular",
"uuid": "0be08ad4-df56-45ca-bafd-78b7197c6a47",
"title": "GRB 240117A: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/01/19 18:53:39 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35582"
},
"title": "GCN CIRCULAR",
"number": "35582",
"subject": "GRB 240117A: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "M. L. Cherry (LSU) A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nY. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nS. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 240117A (Glowbug gamma-ray detection: Cheung\net al., GCN Circ 35569; AstroSat CZTI detection: Joshi et al., GCN\nCirc 35574) triggered the CALET Gamma-ray Burst Monitor (CGBM)\nat 19:52:31.44 UTC on 17 January 2024\n(http://cgbm.calet.jp/cgbm_trigger/flight/1389556167/).\nThe burst signal was seen by only the SGM detector.\n\nThe burst light curve shows a single pulse that starts at T+2.4 sec,\npeaks at T+4.5 sec, and ends at T+8.8 sec. The T90 and T50 durations\nmeasured by the SGM data are 5.7 +/- 0.6 sec and 2.6 +/- 0.3 sec\n(40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1389556167/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35582.",
"published": "2024-01-19T18:53:50.230386Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T18:53:50.230409Z",
"modified": "2024-01-19T18:53:50.238084Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6572,
"topic": "gcn.circular",
"uuid": "59db0f25-4006-4db5-8156-e87f4ed6e645",
"title": "GRB 240414A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/14 22:35:36 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36102"
},
"title": "GCN CIRCULAR",
"number": "36102",
"subject": "GRB 240414A: Enhanced Swift-XRT position"
},
"message_text": "J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 872 s of XRT Photon Counting mode data and 3 UVOT\nimages for GRB 240414A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 184.78364, +56.74056 which is equivalent\nto:\n\nRA (J2000): 12h 19m 8.07s\nDec (J2000): +56d 44' 26.0\"\n\nwith an uncertainty of 3.2 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36102.",
"published": "2024-04-14T22:35:51.707982Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T22:35:51.707999Z",
"modified": "2024-04-14T22:35:51.716590Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5871,
"topic": "gcn.circular",
"uuid": "f0730875-66c7-434f-b54f-4c4580af66e8",
"title": "IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER",
"submitter": "Hop gcn.circular",
"authors": "Robert Stein at Caltech <rdstein@astro.caltech.edu>",
"data": {
"date": "24/01/19 22:13:46 GMT",
"from": "Robert Stein at Caltech <rdstein@astro.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35584"
},
"title": "GCN CIRCULAR",
"number": "35584",
"subject": "IceCube-240105A: Detection of NIR flare of PKS 0446+11 with WINTER"
},
"message_text": "Robert Stein (Caltech), Danielle Frostig (MIT), Viraj Karambelkar (Caltech), Mansi Kasliwal (Caltech), Nathan Lourie (MIT), Geoffrey Mo (MIT), and Robert Simcoe (MIT) report, on behalf of the WINTER collaboration:\n\nWe observed the localization region of the neutrino event IceCube-240105A (Sommani et. al, GCN 35498) with the Palomar 1-m telescope, equipped with the 1 square degree WINTER camera (Lourie et al 2020). We started observations in the J-band beginning at 2024-01-06T05:22:36 UTC, approximately 16.9 hours after event time. As a result of the evolving neutrino localisation (GCN 35485, GCN 35498) and inclement weather, our observations took place over four nights (Jan 5th, 6th, 12th, 16th), with some overlap in coverage between visits. In total, we covered ~90% of the reported localization region at least once, and ~35% at least twice. This estimate does not account for chip gaps. Exposures had a median depth of 18.5 mag AB.\n\nThe images were processed through the WINTER data reduction pipeline implemented using mirar (Stein, Karambelkar et al in prep., https://github.com/winter-telescope/mirar) with image subtraction performed relative to reference images built from the UKIRT Hemisphere Survey (Dye et al. 2017). We extract sources with positive difference flux.\n\nThree methods were used to identify time-varying sources in our data.\nFirst, we apply loose image quality cuts to all 10,789 WINTER candidate sources, without requiring multiple detections, and this yields 1,607 candidates. Second, we separately cross-match all 10,789 WINTER detections to optical detections from the Zwicky Transient Facility (ZTF, Bellm et al 2019) with a radius of 3 arcseconds, and select sources that are detected by both WINTER and ZTF. We recover 12 candidates with a ZTF crossmatch. Third, we select sources detected at least twice by WINTER, and recover 56 candidates. There is some overlap in candidates between these three selection methods.\n\nAfter visual scanning of all these candidates to reject subtraction artefacts, and removing probable stars with measured Gaia DR3 parallax and sources with matches in the Minor Planet Center, we recover one candidate counterpart in our observations. WNTR24aabfj, spatially coincident with blazar PKS 0446+11, passes all three candidate selection methods. \n\nThe blazar has already been flagged as a possible counterpart to IC240105A (GCN #35499, GCN #35517, GCN #35548, ATEL #16397, ATEL #16398, ATEL #16399, ATEL #16402, ATEL #16407, ATEL #16409), undergoing a substantial flare across the EM spectrum. Given that this is a variable source, we perform forced photometry directly on our WINTER science images to measure the flux of this source in our data. We detect the following AB magnitudes for this blazar in our data:\n\nâ----------------------------------------------------\n| Date (UTC) | Mag (AB) | Mag Err | Filter |\nâ----------------------------------------------------\n| 2024-01-06T05:22:36 | 15.10 | 0.04 | J |\n| 2024-01-07T02:43:37 | 15.56 | 0.07 | J |\n| 2024-01-17T02:38:36 | 15.83 | 0.06 | J |\nâ----------------------------------------------------\n\nFor comparison, the reference flux of this source in 2MASS J-band is 17.9 mag (AB), indicating a clear increase in NIR flux relative to this historical baseline. Even over the course of our WINTER observations, the source has faded by >0.7 magnitudes from peak across our three epochs. \n\nFurther observations of the field will continue.\n\nWINTER (Widefield INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucille Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research\n\nAlert querying for coincident ZTF detections is done with AMPEL (Nordin et al. 2019) and nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35584.",
"published": "2024-01-19T22:13:58.329696Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-19T22:13:58.329718Z",
"modified": "2024-01-19T22:13:58.339523Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5911,
"topic": "gcn.circular",
"uuid": "c0c361dc-fcd4-4c3d-a441-36610683c2a7",
"title": "IceCube Alert 240123.48: 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": "24/01/24 17:13:28 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35621"
},
"title": "GCN CIRCULAR",
"number": "35621",
"subject": "IceCube Alert 240123.48: 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 IceCube Alert 240123.48 (trigger No 34080563,23h 50m 33.12s , +04d 22m 12.0s, R=0.51) errorbox 26249 sec after notice time and 26305 sec after trigger time at 2024-01-23 18:44:01 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 71 deg. The sun altitude is -11.7 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 240123.48 errorbox 1 days 19825 sec after notice time and 1 days 19881 sec after trigger time at 2024-01-24 16:56:57 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -30.1 deg.\n\nThe galactic latitude b = -55 deg., longitude l = 97 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#63232\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 26336 | 2024-01-23 18:44:01 | MASTER-SAAO | (23h 57m 38.77s , +04d 59m 29.0s) | C | 60 | 16.2 |\n 26336 | 2024-01-23 18:44:01 | MASTER-SAAO | (23h 59m 26.43s , +04d 46m 52.8s) | C | 60 | 16.3 |\n 27297 | 2024-01-23 19:00:02 | MASTER-SAAO | (23h 59m 37.22s , +04d 49m 10.8s) | C | 60 | 16.8 |\n 106312 | 2024-01-24 16:56:57 | MASTER-Kislovodsk | (23h 56m 37.15s , +05d 21m 39.6s) | C | 60 | 17.5 |\n 106393 | 2024-01-24 16:58:18 | MASTER-Kislovodsk | (23h 54m 43.10s , +04d 59m 36.3s) | C | 60 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35621.",
"published": "2024-01-24T17:13:43.699304Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T17:13:43.699335Z",
"modified": "2024-01-24T17:13:43.705163Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5875,
"topic": "gcn.circular",
"uuid": "ffc29dbd-3590-4920-b041-ee2fd5bd1328",
"title": "GRB 240118A: Mondy optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/20 23:54:29 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35588"
},
"title": "GCN CIRCULAR",
"number": "35588",
"subject": "GRB 240118A: Mondy optical observations"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of IKI GRB FuN:\n\nWe observed the field of Fermi LAT localization of GRB 240118A (Bissaldi, GCN 35560), which was also detected by Fermi GBM (Fermi GBM team, GCN 35558; Hamburg, GCN 35563), NuSTAR (Grefenstette, GCN 35564), Konus-Wind (Frederiks, GCN 35567), Swift BAT (DeLaunay, GCN 35568), and GRBAlpha (Dafcikova et al., GCN 35580), and the localization area observed by MASTER-Tunka observatory (Lipunov et al., GCN 35561) and Abastumani observatory (Pankov et al., GCN 35572).\n\nObservations started on 2024-01-18 (UT) 14:13:46 with AZT-33IK telescope of Sayan observatory (Mondy) in the R-filter. The observations have been carried out in moderate weather conditions with FWHM of 2.5\". We report observations of XRT candidates detected in the Swift TOO program (Evans et al., GCN 35573).\nXRT #1 - out of FOV\nXRT #2 - matches bright USNO-B1.0 star with R2=9.98 mag\nXRT #3 - within the XRT #3 error circle we detect a faint source, which matches SDSS J011408.49+294753.1 source with SDSS DR12 r'= 22.117 and redshift of z_phot = 0.68\nXRT #4 - out of FOV\nXRT #5 - matches bright Gaia DR3 star with G=6.48 mag\nXRT #6 - out of FOV\nXRT #7 - out of FOV\n\nPreliminary photometry of the faint source XRT #3 suggested as an X-ray afterglow (Beardmore et al., GCN 35587) is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2024-01-18 14:13:46 0.537932 R 29*120 22.1 0.3 22.1\n\nThe photometry is based on nearby USNO-B1.0 stars.\n\nAt this time we cannot say anything about the variability of the source. The source at coordinates 01:14:08.48 +29:47:53.2, spatially coinciding with the galaxy SDSS J011408.49+294753.1 with a redshift of 0.68 could be a host galaxy of GRB 240118A.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35588.",
"published": "2024-01-20T23:54:40.192943Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-20T23:54:40.192962Z",
"modified": "2024-01-20T23:54:40.201487Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5876,
"topic": "gcn.circular",
"uuid": "2977236b-4ea1-440e-af0b-f6f58b51655c",
"title": "GRB 240119A: AstroSat CZTI detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/21 06:57:24 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35589"
},
"title": "GCN CIRCULAR",
"number": "35589",
"subject": "GRB 240119A: AstroSat CZTI detection of a short burst"
},
"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 short-duration GRB 240119A which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35583).\n\nThe source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-19 17:29:07.67 UTC. The measured peak count rate associated with the burst is 1304 (+583, -314) counts/s above the background in the combined data of three quadrants (out of four), with a total of 53 (+17, -18) counts. The local mean background count rate was 250 (+25, -36) counts/s. Using cumulative rates, we measure a T90 of 0.06 (+0.02, -0.03) s.\n\nThe source was also faintly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range but we cannot make quantitative inferences due to the intrinsic 1 s binning of Veto data.\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/35589.",
"published": "2024-01-21T06:57:40.508284Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-21T06:57:40.508296Z",
"modified": "2024-01-21T06:57:40.515411Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6573,
"topic": "gcn.circular",
"uuid": "23ba59db-9554-4065-8ed9-11bfa3fe680c",
"title": "GRB240414A : J-band upper limits from WINTER",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "24/04/14 22:55:41 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36103"
},
"title": "GCN CIRCULAR",
"number": "36103",
"subject": "GRB240414A : J-band upper limits from WINTER"
},
"message_text": "Viraj Karambelkar (Caltech), Tomas Ahumada (Caltech), Geoffrey Mo (MIT),\nDanielle Frostig (MIT), Robert Stein (Caltech), Nathan Lourie (MIT), Robert\nSimcoe (MIT), Mansi Kasliwal (Caltech)\n\n\n\nWe observed the field of the GRB 240414A (GCN #36084, #36083, #36087, #36088,\n#36093, #36095, #36097, #36100, #36101) in the near-infrared J-band with\nthe Palomar 1-m telescope, equipped with the 1 square degree WINTER camera\n(Lourie et al. 2020).\n\nOur observations started at UTC 2024-04-14T20:16:20 (MJD 60414.45) and\nlasted a total of 50 minutes. The images were processed through the WINTER\ndata reduction pipeline implemented using mirar (\nhttps://zenodo.org/records/10888437), with image subtraction performed\nrelative to reference images built from the UKIRT Hemisphere Survey (Dye et\nal. 2017).\n\nWe do not detect the optical counterpart reported by GCN #36084, #36085,\n#36097, #36101 in the J-band WINTER images, and derive a limiting mag. of J\n~ 19 mag (AB).\n\nWINTER (Wide-field INfrared Transient ExploreR) is a partnership between\nMIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF\nAAG, the David and Lucille Packard Foundation, and the MIT Kavli Institute\nfor Astrophysics and Space Research\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36103.",
"published": "2024-04-14T22:55:55.683647Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-14T22:55:55.683660Z",
"modified": "2024-04-14T22:55:55.692943Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5877,
"topic": "gcn.circular",
"uuid": "738d332c-4c33-44d2-b379-da568d809bb6",
"title": "GRB 240118C: GECAM-B detection of a long burst ",
"submitter": "Hop gcn.circular",
"authors": "wenlongzhang2018@163.com",
"data": {
"date": "24/01/21 07:39:21 GMT",
"from": "wenlongzhang2018@163.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35590"
},
"title": "GCN CIRCULAR",
"number": "35590",
"subject": "GRB 240118C: GECAM-B detection of a long burst "
},
"message_text": "Wen-Long Zhang, Shao-Lin Xiong, Yan-Qiu Zhang report on behalf of the GECAM team:\n\nGECAM-B was triggered on-ground by a long burst, GRB 240118C, at 2024-01-18T17:23:24.000 UTC (T0), which was also observed by Fermi/GBM (GCN #35576 and GCN #35586) and Swift/BAT-GUANOï¼GCN #35581ï¼. \n\nAccording to the GECAM-B light curve, this burst consists of roughly three pulses with a total duration of ~40 sec. \n\nThe GECAM-B ground calculated location (J2000) is:\nRa: 308.64 deg \nDec: -1.56 deg\nErr: 4.65 deg (1-sigma, statistical only)\nThis GECAM-B localization is consistent with that of Fermi/GBM within the error.\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35590.",
"published": "2024-01-21T07:39:32.449764Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-21T07:39:32.449802Z",
"modified": "2024-01-21T07:39:32.457865Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5878,
"topic": "gcn.circular",
"uuid": "34a7d6f3-2002-4432-837d-552105fd0b53",
"title": "GRB 240119A: GECAM detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "wenlongzhang2018@163.com",
"data": {
"date": "24/01/21 07:42:30 GMT",
"from": "wenlongzhang2018@163.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35591"
},
"title": "GCN CIRCULAR",
"number": "35591",
"subject": "GRB 240119A: GECAM detection of a short burst"
},
"message_text": "Wen-Long Zhang, Shao-Lin Xiong, Chen-Wei Wang, Yue Wang, Yan-Qiu Zhang report on behalf of the GECAM team:\n\nGECAM-B was triggered in-flight by a short burst, GRB 240119A, at 2024-01-19T17:29:07.700 UTC (T0), which was also detected by Fermi/GBM (GCN #35583) and AstroSat CZTI (GCN #35589). At the same time, GECAM-C was also triggered on-ground by this burst.\n\nAccording to the light curves, this burst shows a total duration of ~0.1 sec (20-1000 keV).\n\nAccording to the in-flight software, GECAM-B localized this burst to the following position (J2000):\nRa: 355.51 deg\nDec: -81.39 deg\nErr: 5.76 deg (1-sigma, statistical only)\nThis GECAM-B localization is consistent with that of Fermi/GBM within the error.\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35591.",
"published": "2024-01-21T07:42:38.087640Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-21T07:42:38.087654Z",
"modified": "2024-01-21T07:42:38.092117Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5885,
"topic": "gcn.circular",
"uuid": "08fb31ba-6db6-413e-b40e-e6772b5fe062",
"title": "GRB 240122A: Redshift from OSIRIS+/GTC",
"submitter": "Hop gcn.circular",
"authors": "Christina Thöne at ASU-CAS <christina.thoene@gmail.com>",
"data": {
"date": "24/01/23 01:06:27 GMT",
"from": "Christina Thöne at ASU-CAS <christina.thoene@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35598"
},
"title": "GCN CIRCULAR",
"number": "35598",
"subject": "GRB 240122A: Redshift from OSIRIS+/GTC"
},
"message_text": "C. C. Thoene (ASU-CAS), A. de Ugarte Postigo (CNRS/OCA and LAM), J. F. Agui Fernandez (CAHA), L. Izzo (INAF/Capodimonte), J. P. U. Fynbo (DAWN/NBI), N. R. Tanvir (U. Leicester), M. Blazek (CAHA), S. Geier, A. Garcia-Rodriguez, Miguel Rivero Mendez (both GTC) report: \n\nWe obtained spectroscopy of the optical afterglow (Kumar et al. GCN 35596) of the MAXI/GSC GRB 240122A (Negoro et al. GCN 35593) with OSIRIS+ at the 10.4m GTC at a mean epoch of 0.5357 days after the GRB. The observation consisted of 3x900s exposures using grism R1000B, which covers the range between 3700 and 7780 AA at a resolving power of about 600. The observation was strongly impacted by the nearby Moon and poor seeing.\n\nA preliminary reduction of the spectrum shows a continuum with multiple absorption features. We determine the redshift of the GRB indentifying Lyman alpha and Lyman beta as well as absorption features of SiII, SiIV, CI, CII, CIV and FeII at a common redshift of z=3.162. We note that the Lyman series is rather weak compared to typical GRB sight lines.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35598.",
"published": "2024-01-23T01:06:38.102844Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T01:06:38.102864Z",
"modified": "2024-01-23T01:06:38.110963Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5898,
"topic": "gcn.circular",
"uuid": "def2879e-8542-4e51-8ef1-c22eaf07921e",
"title": "GRB 240123B: 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": "24/01/23 17:58:30 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35608"
},
"title": "GCN CIRCULAR",
"number": "35608",
"subject": "GRB 240123B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 17:48:03 UT on 23 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240123B (trigger 727724888.218344 / 240123742).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 312.7, Dec = 17.3 (J2000 degrees, equivalent to J2000 20h 50m, 17d 18'), with a statistical uncertainty of 6.9 degrees.\n\nThe angle from the Fermi LAT boresight is 51.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240123742/quicklook/glg_skymap_all_bn240123742.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/bn240123742/quicklook/glg_healpix_all_bn240123742.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240123742/quicklook/glg_lc_medres34_bn240123742.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35608.",
"published": "2024-01-23T17:58:38.197298Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T17:58:38.197317Z",
"modified": "2024-01-23T17:58:38.202102Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5879,
"topic": "gcn.circular",
"uuid": "8412d2a7-5e41-4cb7-9f5c-b42254f2e9f1",
"title": "IPN triangulation of GRB 240119A (short)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/01/22 14:47:24 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35592"
},
"title": "GCN CIRCULAR",
"number": "35592",
"subject": "IPN triangulation of GRB 240119A (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 bright, short-duration GRB 240119A\n(Fermi-GBM detection: The Fermi GBM team, GCN 35583;\nAstroSat-CZTI detection: Joshi et al.: GCN 35589;\nGECAM-B detection: Zhang et al.: GCN 35591)\nwas detected by Fermi (GBM trigger 727378152), INTEGRAL (SPI-ACS),\nSwift (BAT), Konus-Wind, AstroSat (CZTI), and GECAM-B\nat about 62948 s UT (17:29:08).\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 359.940 (23h 59m 46s) -75.259 (-75d 15' 33\")\n Corners:\n 342.700 (22h 50m 48s) -82.193 (-82d 11' 33\")\n 343.891 (22h 55m 34s) -82.325 (-82d 19' 29\")\n 4.927 (00h 19m 42s) -67.683 (-67d 41' 00\")\n 4.404 (00h 17m 37s) -67.603 (-67d 36' 12\")\n ---------------------------------------------\nThe error box area is 3.2 sq. deg, and its maximum\ndimension is 15.4 deg (the minimum one is 12.5 arcmin).\nThe Sun distance was 62 deg.\n\nThis localization may be improved.\n\nThe IPN localization is consistent with, but reduces the area of,\nthe Fermi-GBM localizations.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240119_T62945/IPN/\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/35592.",
"published": "2024-01-22T14:47:43.048249Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-22T14:47:43.048264Z",
"modified": "2024-01-22T14:47:43.056448Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5880,
"topic": "gcn.circular",
"uuid": "a80801d5-cff5-462d-a9fe-f576e1ee07e0",
"title": "GRB 240122A: MAXI/GSC detection",
"submitter": "Hop gcn.circular",
"authors": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
"data": {
"date": "24/01/22 14:53:25 GMT",
"from": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35593"
},
"title": "GCN CIRCULAR",
"number": "35593",
"subject": "GRB 240122A: MAXI/GSC detection"
},
"message_text": "H. Negoro (Nihon U.), W. Iwakiri (Chiba U.), M. Serino (AGU),\nM. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, 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.), Y. Kawakubo (LSU), and M. Sugizaki (NAOC)\n\n\nThe MAXI/GSC nova alert system triggered on a faint uncatalogued X-ray transient source\nat 10:28:03 UT on January 22, 2024.\nBecause our localization program did not run, we can not provide a precise error region.\nThe source position determined with the nova alert system (Negoro et al. 2016) is\n(R.A., Dec) = (92.827 deg, -19.031 deg) = (06 11 18, -19 01 51) (J2000)\nwith an uncertainty of more than 30 arc-min. The burst duration is about 10 sec, and\nthe 2-10 keV X-ray flux around the peak was about 150 mCrab.\nThere was no significant excess flux in the previous transit at 08:55 UT\nand in the next transit at 12:00 UT with an upper limit of 20 mCrab for each.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35593.",
"published": "2024-01-22T14:53:37.971364Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-22T14:53:37.971378Z",
"modified": "2024-01-22T14:53:37.975601Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5902,
"topic": "gcn.circular",
"uuid": "7661fa5d-5f3f-4845-9826-c73eba950ba5",
"title": "GRB 240123A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/23 22:11:25 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35612"
},
"title": "GCN CIRCULAR",
"number": "35612",
"subject": "GRB 240123A: Swift-XRT refined Analysis"
},
"message_text": "M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), J. D. Gropp\n(PSU), S. Dichiara (PSU), J.A. Kennea (PSU), J.P. Osborne (U.\nLeicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V.\nD'Elia (SSDC & INAF-OAR) and P.A. Evans report on behalf of the\nSwift-XRT team:\n\nWe have analysed 6.5 ks of XRT data for GRB 240123A, from 131 s to 23.7\nks after the BAT trigger. The data comprise 164 s in Windowed Timing\n(WT) mode (the first 8 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode. The refined XRT position is RA,\nDec = 199.3473, +60.6184 which is equivalent to:\n\nRA (J2000): 13 17 23.34\nDec(J2000): +60 37 06.1\n\nwith an uncertainty of 3.5 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with a series of power-law decays. The\ninitial decay index is alpha=7.2 (+0.8, -2.8). At T+145 s the decay\nflattens to an alpha of 0.3 (+1.0, -1.8). The light curve breaks again\nat T+183 s to a decay with alpha=2.91 (+0.20, -0.19), before a final\nbreak at T+635 s s after which the decay index is 0.58 (+/-0.08).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 2.35 (+0.09, -0.07). The\nbest-fitting absorption column is consistent with the Galactic value\nof 1.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has\na photon index of 2.01 (+0.17, -0.13) and a best-fitting absorption\ncolumn of 2.3 (+3.3, -0.9) x 10^20 cm^-2. The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.2 x 10^-11 (3.4 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 2.3 (+3.3, -0.9) x 10^20 cm^-2\nGalactic foreground: 1.4 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 2.01 (+0.17, -0.13)\n\nIf the light curve continues to decay with a power-law decay index of\n0.58, the count rate at T+24 hours will be 0.028 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.0 x\n10^-13 (9.6 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/01210276.\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/35612.",
"published": "2024-01-23T22:11:37.182314Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T22:11:37.182342Z",
"modified": "2024-01-23T22:11:37.191835Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5903,
"topic": "gcn.circular",
"uuid": "50285f14-99f3-4aad-886d-7600628c8860",
"title": "GRB 240122A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"data": {
"date": "24/01/23 22:57:57 GMT",
"from": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35613"
},
"title": "GCN CIRCULAR",
"number": "35613",
"subject": "GRB 240122A: Swift/UVOT Upper Limits"
},
"message_text": "M. H. Siegel (PSU) and and V. DâElia (SSDC & INAF-OAR) report on behalf of the\nSwift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240122A\nfrom 29.5 ks to 35.6 ks after the MAXI trigger (Negoro et al., GCN Circ. 35593).\nNo optical afterglow consistent with either the optical (Kumar et al., GCN\nCirc. 35596) or X-ray (Ambrosi et al., GCN Circ. 3600) position is detected in the initial\nUVOT exposures. The lack of detection in the u-band would be consistent with the\nredshift of 3.162 given by Saccardi et al. (GCN Circ. 35599).\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures of\nthe candidate afterglow field are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nu 35166 35655 481 >20.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.064 in the direction of the burst\n(Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35613.",
"published": "2024-01-23T22:58:12.403304Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T22:58:12.403317Z",
"modified": "2024-01-23T22:58:12.410362Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5881,
"topic": "gcn.circular",
"uuid": "2b3d29c7-3f93-4408-8c05-08645392322e",
"title": "Konus-Wind detection of GRB 240119A (short/hard)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "24/01/22 15:40:27 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35594"
},
"title": "GCN CIRCULAR",
"number": "35594",
"subject": "Konus-Wind detection of GRB 240119A (short/hard)"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe short GRB 240119A (Fermi-GBM detection: The Fermi GBM team, GCN 35583;\nAstroSat-CZTI detection: Joshi et al.: GCN 35589;\nGECAM-B detection: Zhang et al.: GCN 355921;\nIPN triangulation: Svinkin et al., GCN 35592)\ntriggered Konus-Wind (KW) at T0=62945.465 s UT (17:29:05.465).\n\nThe burst light curve shows a single emission pulse\nwhich starts at ~T0-0.032 s and has a duration of ~0.13 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/GRB240119_T62945/\n\nAs observed by Konus-Wind, the burst had\na total fluence of (8.1 ± 1.7)x10^-7 erg/cm^2 and\na 16-ms peak energy flux, measured from T0-0.016 s,\nof (1.9 ± 0.4)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe spectrum of the burst (measured from T0-0.048 s to T0+0.080 s)\ncan be described, in the 20 keV - 1.5 MeV range, by a power law with\nexponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.23(-0.32,+0.40) and Ep = 678(-141,+254) keV.\n\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35594.",
"published": "2024-01-22T15:40:40.331095Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-22T15:40:40.331115Z",
"modified": "2024-01-22T15:40:40.339178Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5882,
"topic": "gcn.circular",
"uuid": "2b819177-37a0-49ee-b071-ff2ea9531da6",
"title": "GRB 240122A: Tiled Swift observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/22 16:50:08 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35595"
},
"title": "GCN CIRCULAR",
"number": "35595",
"subject": "GRB 240122A: Tiled Swift observations"
},
"message_text": "\nP. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a series of observations, tiled on the sky, of the\nMAXI GRB 240122A. Automated analysis of the XRT data will\nbe presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00119\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. The probability of finding\nserendipitous sources, unrelated to the MAXI event is high: any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a GCN Circular\nafter manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35595.",
"published": "2024-01-22T16:50:20.699147Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-22T16:50:20.699162Z",
"modified": "2024-01-22T16:50:20.705608Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5883,
"topic": "gcn.circular",
"uuid": "badf115b-9f98-4213-8a5b-3570f6f0914d",
"title": "GRB 240122A: GOTO optical counterpart candidate",
"submitter": "Hop gcn.circular",
"authors": "Amit Kumar at University of Warwick, UK <amitkundu515@gmail.com>",
"data": {
"date": "24/01/22 18:50:31 GMT",
"from": "Amit Kumar at University of Warwick, UK <amitkundu515@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35596"
},
"title": "GCN CIRCULAR",
"number": "35596",
"subject": "GRB 240122A: GOTO optical counterpart candidate"
},
"message_text": "A. Kumar; B. P. Gompertz; K. Ackley; G. Ramsay; R. Starling; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jimenez-Ibarra; D. O'Neill; D. Steeghs; D. K. Galloway; V. Dhillon; P. O'Brien; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nThe Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) serendipitously covered the localisation region of MAXI/GSC detected GRB 240122A (Negoro et al. GCN 35593) at 11:11:43 UT on 2024-01-22 (43.6 minutes after trigger). Each observation consisted of 4x45s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using recent survey observations of the same pointings. Source candidates were initially filtered using a classifier (Killestein et al. 2021) and cross-matched against a variety of contextual and minor planet catalogues. Human vetting was carried out in real time on any candidates that passed the above checks.\n\nWe identify 1 new optical transient (GOTO24eu/AT2024apy) within the MAXI/GSC uncertainty region. We find no evidence of this source prior to the GRB trigger time in the previous GOTO epoch at 2024-01-21 12:06:42 (22.4 hours prior), to a 5 sigma limiting magnitude of L > 19.8. The source was also not present in the ZTF observations provided by the Lasair broker (Smith et al. 2019), or the ATLAS forced photometry server (Shingles et al. 2021).\n\nName | RA(J2000) | Dec(J2000) | Filter | Mag(AB)\nGOTO24eu/AT2024apy | 06:12:12.91| -19:08:38.81 | L | 17.06 +/- 0.04\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nObservations are ongoing.\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35596.",
"published": "2024-01-22T18:50:42.589290Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-22T18:50:42.589312Z",
"modified": "2024-01-22T18:50:42.595972Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5884,
"topic": "gcn.circular",
"uuid": "33892379-72b9-42e4-b46f-53848220567f",
"title": "GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading",
"submitter": "Hop gcn.circular",
"authors": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"data": {
"date": "24/01/23 00:32:46 GMT",
"from": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35597"
},
"title": "GCN CIRCULAR",
"number": "35597",
"subject": "GRB 240122A: LT non-detection of GOTO candidate counterpart confirms fading"
},
"message_text": "B. P. Gompertz (U. Birmingham) reports for a larger collaboration:\n\n\nWe observed the position of the GOTO candidate optical counterpart (Kumar et al, GCN 35596) to the MAXI-detected GRB 240122A (Negoro et al, GCN 35593) with the IO:O optical camera on the 2m robotic Liverpool Telescope. Observations consisted of 3x60s exposures in each of the SDSS r, i, and z filters under seeing of 2.1â, beginning at 23:36:51 UT on 2024-01-22, 13.1 hours after the GRB trigger. We do not detect the source to a 3-sigma limiting magnitude of r(AB) > 19.36. This non-detection indicates fading of more than two magnitudes in the ~12.4 hours since the GOTO detection.\nMagnitudes were calibrated to PS1 stars and are not corrected for Galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35597.",
"published": "2024-01-23T00:32:58.562981Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T00:32:58.562999Z",
"modified": "2024-01-23T00:32:58.569300Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5904,
"topic": "gcn.circular",
"uuid": "ed77f1b9-806d-43de-a3f8-413e004d2fe9",
"title": "Fermi GRB 240123B: 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": "24/01/23 23:15:32 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35614"
},
"title": "GCN CIRCULAR",
"number": "35614",
"subject": "Fermi GRB 240123B: 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 GRB 240123B ( Fermi GBM team, GCN 35608) errorbox 17492 sec after notice time and 17523 sec after trigger time at 2024-01-23 22:40:06 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -21.0 deg.\n\nThe galactic latitude b = -17 deg., longitude l = 64 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#63736\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 17534 | 2024-01-23 22:40:06 | MASTER-Tunka | (20h 45m 43.98s , +25d 49m 07.9s) | C | 20 | 16.9 |\n 17626 | 2024-01-23 22:41:41 | MASTER-Tunka | (20h 25m 46.01s , +22d 02m 50.8s) | C | 15 | 16.9 |\n 17669 | 2024-01-23 22:42:23 | MASTER-Tunka | (20h 26m 42.78s , +23d 55m 03.1s) | C | 15 | 17.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35614.",
"published": "2024-01-23T23:15:42.807789Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T23:15:42.807815Z",
"modified": "2024-01-23T23:15:42.814633Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5920,
"topic": "gcn.circular",
"uuid": "12885b1a-2776-4a43-bc33-999e76a187b1",
"title": "GRB 240125A (short): Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/25 18:08:11 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35630"
},
"title": "GCN CIRCULAR",
"number": "35630",
"subject": "GRB 240125A (short): Glowbug gamma-ray detection"
},
"message_text": "GRB 240125A (short): Glowbug gamma-ray detection\n \nC.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 the short GRB 240125A, which was also detected by CALET/CGBM (Trigger 1390210300).\n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-25 09:34:59.200 with a duration of 1.28 s and a total significance of about 51.2 sigma. The light curve comprises a triple-peaked structure.\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=0.8 and a cutoff energy (\"Epeak\") of 705 keV. The modeled 10-10000 keV fluence is 3.2e-06 erg/cm^2.\n \nThe best-fit localization is RA, Decl. (J2000, deg) = 153.4, 48.7 with a radius of 9.3 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/35630.",
"published": "2024-01-25T18:08:22.854190Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T18:08:22.854216Z",
"modified": "2024-01-25T18:08:22.862334Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5921,
"topic": "gcn.circular",
"uuid": "8ba5d3c6-96b6-433f-b43d-f751e3257444",
"title": "GRB 240123A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/25 18:11:33 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35631"
},
"title": "GCN CIRCULAR",
"number": "35631",
"subject": "GRB 240123A: 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 240123A, which was also detected by Swift/BAT (GCN 35602, 35622), Fermi/GBM (GCN 35610), and GRBAlpha (GCN 35628). \n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-23 11:05:48.840 with a duration of 6.1 s and a total significance of about 12.2 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=-0.4 and a cutoff energy (\"Epeak\") of 719 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/35631.",
"published": "2024-01-25T18:11:43.238467Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T18:11:43.238484Z",
"modified": "2024-01-25T18:11:43.244217Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5886,
"topic": "gcn.circular",
"uuid": "188d647b-6abb-4d62-b2e2-32fa00b4c8fb",
"title": "GRB 240122A: VLT/X-shooter redshift confirmation",
"submitter": "Hop gcn.circular",
"authors": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"data": {
"date": "24/01/23 09:17:34 GMT",
"from": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35599"
},
"title": "GCN CIRCULAR",
"number": "35599",
"subject": "GRB 240122A: VLT/X-shooter redshift confirmation"
},
"message_text": "A. Saccardi (GEPI, Observatoire de Paris), B. Sbarufatti (INAF-OAB), D. B. Malesani (DAWN/NBI & Radboud Univ.), L. Izzo (INAF-OACn & DARK/NBI), A. de Ugarte Postigo (CNRS/OCA & LAM), S. Campana (INAF-OAB), A. J. Levan (Radboud Univ. & Warwick Univ.), D. Hartmann (Clemson University) report on behalf of the Stargate collaboration:\n\nFollowing the discovery of GOTO24eu/AT2024apy (Kumar et al. 2024, GCN 35596) within the error box of MAXI/GSC GRB 240122A (Negoro et al. 2024, GCN 35593), we acquired a spectrum of the optical counterpart candidate using the ESO/VLT/UT3 (Melipal) equipped with the X-shooter spectrograph. It covers the wavelength range 3000-21000 AA, and consists of 4 exposures of 1200 s each. Observations started at 02:25:37 UT on Jan 23 2024 (~16 hr after the trigger).\n\nWe detect a continuum over the entire wavelength range. From the detection of a rather weak Lya absorption at ~5060 AA and multiple absorption features, which we interpret as being due to SiII, CII, MgII, SiIV and CIV, we infer a common redshift of z = 3.162 (consistent with Thoene et al. 2024, GCN 35598). We conclude this is the redshift of the burst. We also note the presence of additional absorption features likely due to multiple intervening systems, one of them very strong at z = 2.757 with a broad Lya at ~4570 AA.\n\nWe acknowledge the excellent support from the ESO observing staff in Paranal, in particular Felipe Gaete and Jonathan Smoker.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35599.",
"published": "2024-01-23T09:17:50.028650Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T09:17:50.028665Z",
"modified": "2024-01-23T09:17:50.038029Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5887,
"topic": "gcn.circular",
"uuid": "629af58b-261e-497c-997d-d1d7144bd51b",
"title": "GRB 240122A: Swift-XRT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/23 11:25:05 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35600"
},
"title": "GCN CIRCULAR",
"number": "35600",
"subject": "GRB 240122A: Swift-XRT afterglow detection"
},
"message_text": "E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC &\nINAF-OAR), D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU),\nJ.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans\n(U. Leicester) reports on behalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the MAXI-detected\nburst GRB 240122A in a series of observations tiled on the sky. The\ntotal exposure time is 3.6 ks, distributed over 7 tiles; the maximum\nexposure at a single sky location was 1.3 ks. The data were collected\nbetween T0+29.5 ks and T0+35.6 ks, and are entirely in Photon Counting\n(PC) mode.\n\nFour uncatalogued X-ray sources are detected, of which one (\"Source 3\")\nis above the RASS 3-sigma upper limit at this position, and is\ntherefore likely the GRB afterglow. Using 930 s of PC mode data and 2\nUVOT images, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 93.05391, -19.14418 which is equivalent to:\n\nRA (J2000): 06h 12m 12.94s\nDec(J2000): -19d 08' 39.0\"\n\nwith an uncertainty of 2.9 arcsec (radius, 90% confidence). This\nposition is 14.5 arcmin from the MAXI position, and it is consistent\nwith the GOTO optical detection (GCN 35596, Kumar et al. 2024).\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=2.5 (+0.7, -2.1).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.82 (+0.33, -0.25). The\nbest-fitting absorption column is consistent with the Galactic value\nof 1.0 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.3 x 10^-11 (3.6 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.0 (+/-0.8) x 10^21 cm^-2\nGalactic foreground: 1.0 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.82 (+0.33, -0.25)\n\nIf the light curve continues to decay with a power-law decay index of\n2.5, the count rate at T+24 hours will be 0.012 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.8 x\n10^-13 (4.2 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/00021645.\nThe results of the full analysis of the tiled XRT observations are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00119.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35600.",
"published": "2024-01-23T11:25:15.337342Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T11:25:15.337354Z",
"modified": "2024-01-23T11:25:15.344150Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5890,
"topic": "gcn.circular",
"uuid": "223007fa-d01d-4f7f-8224-27cf3e6a0f3b",
"title": "Swift GRB240123.46: 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": "24/01/23 11:26:57 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35601"
},
"title": "GCN CIRCULAR",
"number": "35601",
"subject": "Swift GRB240123.46: 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 GRB240123.46 (trigger No 1210276,13h 17m 16.56s , +60d 37m 55.2s, R=0.05) errorbox 41 sec after notice time and 121 sec after trigger time at 2024-01-23 11:07:48 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 68 deg. The sun altitude is -13.5 deg.\n\nThe galactic latitude b = 56 deg., longitude l = 117 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#63206\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 131 | MASTER-Tunka | C | 20 | 17.6 |\n 160 | MASTER-Tunka | C | 20 | 17.6 |\n 186 | MASTER-Tunka | C | 15 | 17.5 |\n 209 | MASTER-Tunka | C | 15 | 17.5 |\n 229 | MASTER-Tunka | C | 10 | 17.4 |\n 247 | MASTER-Tunka | C | 10 | 17.3 |\n 265 | MASTER-Tunka | C | 10 | 17.4 |\n 284 | MASTER-Tunka | C | 10 | 17.1 |\n 302 | MASTER-Tunka | C | 10 | 17.4 |\n 320 | MASTER-Tunka | C | 10 | 17.5 |\n 339 | MASTER-Tunka | C | 10 | 17.4 |\n 357 | MASTER-Tunka | C | 10 | 17.3 |\n 375 | MASTER-Tunka | C | 10 | 17.5 |\n 394 | MASTER-Tunka | C | 10 | 17.4 |\n 412 | MASTER-Tunka | C | 10 | 17.2 |\n 430 | MASTER-Tunka | C | 10 | 17.4 |\n 448 | MASTER-Tunka | C | 10 | 17.3 |\n 466 | MASTER-Tunka | C | 10 | 17.4 |\n 486 | MASTER-Tunka | C | 10 | 17.4 |\n 504 | MASTER-Tunka | C | 10 | 17.4 |\n 522 | MASTER-Tunka | C | 10 | 17.4 |\n 541 | MASTER-Tunka | C | 10 | 17.4 |\n 559 | MASTER-Tunka | C | 10 | 17.4 |\n 577 | MASTER-Tunka | C | 10 | 17.4 |\n 595 | MASTER-Tunka | C | 10 | 17.4 |\n 613 | MASTER-Tunka | C | 10 | 17.4 |\n 632 | MASTER-Tunka | C | 10 | 17.4 |\n 651 | MASTER-Tunka | C | 10 | 17.4 |\n 669 | MASTER-Tunka | C | 10 | 17.4 |\n 706 | MASTER-Tunka | C | 10 | 17.4 |\n 724 | MASTER-Tunka | C | 10 | 17.4 |\n 743 | MASTER-Tunka | C | 10 | 17.4 |\n 761 | MASTER-Tunka | C | 10 | 17.5 |\n 781 | MASTER-Tunka | C | 10 | 17.4 |\n 799 | MASTER-Tunka | C | 10 | 17.5 |\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/35601.",
"published": "2024-01-23T11:27:04.778840Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T11:27:04.778855Z",
"modified": "2024-01-23T11:27:04.785072Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5891,
"topic": "gcn.circular",
"uuid": "51f1c97f-fdf4-42c8-b948-0a5b3211f334",
"title": "GRB 240123A: Swift detection of a burst with a possible optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Antonino D'Ai' at IASF-PA <antonino.dai@inaf.it>",
"data": {
"date": "24/01/23 11:34:56 GMT",
"from": "Antonino D'Ai' at IASF-PA <antonino.dai@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35602"
},
"title": "GCN CIRCULAR",
"number": "35602",
"subject": "GRB 240123A: Swift detection of a burst with a possible optical counterpart"
},
"message_text": "\nA. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA),\nV. D'Elia (SSDC & INAF-OAR), J.D. Gropp (PSU), J. A. Kennea (PSU),\nA. Y. Lien (U Tampa), A. Melandri (INAF-OAR),\nK. L. Page (U Leicester), T. M. Parsotan (GSFC/UMBC/CRESSTII) and\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 11:05:46 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240123A (trigger\u001210276). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 199.319, +60.632 which is\n RA(J2000) = 13h 17m 16s\n Dec(J2000) = +60d 37' 53\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 25 sec. The peak count rate\nwas ~500 counts/sec (15-350 keV), at ~5 sec after the trigger.\n\nThe XRT began observing the field at 11:08:08.6 UT, 141.8 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nfading, uncatalogued X-ray source located at RA, Dec 199.34797,\n60.61894 which is equivalent to:\n RA(J2000) = 13h 17m 23.51s\n Dec(J2000) = +60d 37' 08.2\"\nwith an uncertainty of 3.8 arcseconds (radius, 90% containment). This\nlocation is 69 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (1.45 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.7\n(+2.69/-2.33) x 10^21 cm^-2 (90% confidence).\n\nThe initial flux in the 2.5 s image was 7.30e-10 erg cm^-2 s^-1 (0.2-10\nkeV).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 151 seconds after the BAT trigger. There is a candidate afterglow in\nthe rapidly available 2.7'x2.7' sub-image at\n RA(J2000) =\t13:17:23.25 = 199.3468\n DEC(J2000) = +60:37:04.4 = 60.6179\nwith a 90%-confidence error radius of about 0.2 arc sec. This position is 4.3\narc sec. from the center of the XRT error circle. The estimated magnitude is\n19.9 with a 1-sigma error of about 0.2. No correction has been made for the\nexpected extinction.\n\nBurst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.it).\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/35602.",
"published": "2024-01-23T11:35:07.883492Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T11:35:07.883511Z",
"modified": "2024-01-23T11:35:07.889106Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5895,
"topic": "gcn.circular",
"uuid": "fbddd9f8-1f67-41d5-b8b2-daae17435677",
"title": "GRB 240123A: Mondy optical afterglow observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/23 15:52:15 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35605"
},
"title": "GCN CIRCULAR",
"number": "35605",
"subject": "GRB 240123A: Mondy optical afterglow observations"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 231117A (D'Ai et al., GCN 35602) with AZT-33IK telescope of Mondy observatory in R-filter starting on 2024-01-23 (UT) 14:00:48. We clearly detect a new fading object at coordinates (J2000) 13 17 23.87 +60 37 05.3 with uncertainties of 0.2 arcsec which is slightly differ from coordinates reported by UVOT (D'Ai et al., GCN 35602). The object is absent in SDSS catalogue. Preliminary photometry is following\n\nDate UT start t-T0 Exp. Filter OT Err.\n (mid, days) (s)\n2024-01-23 14:00:48 0.126415 7x120 R 19.07 0.10 20.9\n2024-01-23 14:20:48 0.144479 13x120 R 19.25 0.10 21.3\n2024-01-23 14:46:49 0.163934 15x120 R 19.37 0.11 21.3\n\nThe photometry is based on nearby USNO-B1.0 R2 stars.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35605.",
"published": "2024-01-23T15:52:26.910271Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T15:52:26.910292Z",
"modified": "2024-01-23T15:52:26.915359Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5892,
"topic": "gcn.circular",
"uuid": "307f226c-587d-44bf-a321-c7a382156d06",
"title": "Konus-Wind detection of GRB 240112A",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/01/23 11:56:59 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35603"
},
"title": "GCN CIRCULAR",
"number": "35603",
"subject": "Konus-Wind detection of GRB 240112A"
},
"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 240112A\n(GECAM-B detection: Wang and Xiong, GCN 35520;\nIPN triangulation: Kozyrev et al., GCN 35554)\ntriggered Konus-Wind at T0 481.732 s UT (05:41:21.732).\n\nThe burst light curve shows the main multi-peaked episode,\nwhich starts at ~T0-0.2 s and has a total duration of ~2.8 s.\nA fainter broad pulse is observed in the KW data from ~T0+113 s\nto ~T0+120 s after the main pulse, whose association with\nGRB 240112A is supported by the consistent KW ecliptic\nlatitude response.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240112_T20481/\n\nAs observed by Konus-Wind, the burst (main episode)\nhad a fluence of 7.58(-1.05,+1.13)x10^-6 erg/cm2,\nand a 64-ms peak flux, measured from T0+1.376 s,\nof 1.03(-0.19,+0.20)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe spectrum of the main episode\n(measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -1.04(-0.21,+0.23),\nthe high energy photon index beta = -2.67(-0.73,+0.26),\nthe peak energy Ep = 120(-15,+20) keV\n(chi2 = 118/75 dof).\n\nThe spectrum of the fainter broad pulse\n(measured from T0+106.752 to T0+123.136 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 = -1.67(-0.32,+0.53)\nand Ep = 206(-195,+1360) keV (chi2 = 71/86 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand an upper limit on the high energy photon index: beta < -2.0\n(chi2 = 71/85 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/35603.",
"published": "2024-01-23T11:57:10.286438Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T11:57:10.286465Z",
"modified": "2024-01-23T11:57:10.293499Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5893,
"topic": "gcn.circular",
"uuid": "382a467b-0e19-46a9-a2cc-e4bbece61512",
"title": "IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event",
"submitter": "Hop gcn.circular",
"authors": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"data": {
"date": "24/01/23 15:06:40 GMT",
"from": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35604"
},
"title": "GCN CIRCULAR",
"number": "35604",
"subject": "IceCube-240123A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2024-01-23 at 11:25:36.05 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 for Bronze alerts is 30%. This alert has an estimated false alarm rate of 4.1505 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/138890_34080563.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2024-01-23\nTime: 11:25:36.05\nRA: 357.54 (+1.93, -1.71 deg 90% PSF containment) J2000\nDec: +4.26 (+0.80, -0.76 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\nThere are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J2349.4+0534 at RA: 357.36 deg, Dec: 5.58 deg (1.33 deg away from the best-fit event position).\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime \nalert 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/35604.",
"published": "2024-01-23T15:06:57.982448Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T15:06:57.982465Z",
"modified": "2024-01-23T15:06:57.990741Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5896,
"topic": "gcn.circular",
"uuid": "20bb540f-1d0d-40e5-83ba-81eb862293cf",
"title": "GRB 240122B: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/01/23 17:26:28 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35606"
},
"title": "GCN CIRCULAR",
"number": "35606",
"subject": "GRB 240122B: 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 240122B, which was also detected by CALET/CGBM (Trigger 1389985993).\n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-22 19:16:24.160 with a duration of 21.5 s and a total significance of about 28.9 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=2.2 and a cutoff energy (\"Epeak\") of 211 keV. The modeled 10-10000 keV fluence is 2.0e-06 erg/cm^2.\n \nThe best-fit localization is RA, Decl. (J2000, deg) = 22.8, 59.3 with a radius of 12.4 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/35606.",
"published": "2024-01-23T17:26:39.041055Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T17:26:39.041079Z",
"modified": "2024-01-23T17:26:39.048065Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5897,
"topic": "gcn.circular",
"uuid": "51fd59ae-4667-4a2d-a334-f194b338d33f",
"title": "GRB 240118: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"data": {
"date": "24/01/23 17:35:39 GMT",
"from": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35607"
},
"title": "GCN CIRCULAR",
"number": "35607",
"subject": "GRB 240118: Swift/UVOT Upper Limits"
},
"message_text": "M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240118\n96191 s after the LAT trigger (Bissaldi et al., GCN Circ. 35560). No optical afterglow consistent with the\nLAT position or the XRT position (Beardmore et al., GCN Circ. 35587) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nu 96191 103639 3161 >20.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.056 in the direction of the burst\n(Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35607.",
"published": "2024-01-23T17:35:49.781727Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T17:35:49.781745Z",
"modified": "2024-01-23T17:35:49.787659Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6574,
"topic": "gcn.circular",
"uuid": "10eb7234-b35b-4739-919a-b005fd35f01d",
"title": "GRB 240414A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/15 03:00:26 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36104"
},
"title": "GCN CIRCULAR",
"number": "36104",
"subject": "GRB 240414A: Swift-XRT refined Analysis"
},
"message_text": "S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P.\nOsborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini\n(INAF-OAB), E. Ambrosi\t(INAF-IASFPA) , M. Capalbi (INAF-IASFPA) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 5.4 ks of XRT data for GRB 240414A, from 9.9 ks to\n74.3 ks after the BAT trigger. The data are entirely in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.0 (+/-0.4).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.0 (+0.4, -0.3). The\nbest-fitting absorption column is 3.7 (+8.5, -2.3) x 10^20 cm^-2,\nconsistent with the Galactic value of 1.4 x 10^20 cm^-2 (Willingale et\nal. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux\nconversion factor deduced from this spectrum is 3.2 x 10^-11 (3.5 x\n10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 3.7 (+8.5, -2.3) x 10^20 cm^-2\nGalactic foreground: 1.4 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 2.0 (+0.4, -0.3)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01221714.\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/36104.",
"published": "2024-04-15T03:00:40.814655Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T03:00:40.814673Z",
"modified": "2024-04-15T03:00:40.822616Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5899,
"topic": "gcn.circular",
"uuid": "df9b1b41-712b-49c8-92e2-01b243406cf9",
"title": "GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/01/23 18:06:11 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35609"
},
"title": "GCN CIRCULAR",
"number": "35609",
"subject": "GRB 240123A: Mondy continued optical observations + correction of the GRB name in GCN 35605"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe continued to observe the afterglow of GRB 240123A (D'Ai et al., GCN 35602) with AZT-33IK telescope of Mondy observatory in R-filter originally started on 2024-01-23 (UT) 14:00:48 (Pankov et al., GCN 35605). We confirm the afterglow decay, which detected previously (D'Ai et al., GCN 35602; Pankov et al., GCN 35605).\n\nPreliminary photometry of the afterglow is following\n\nDate UT start t-T0 Exp. Filter OT Err. UL(3sigma)\n (mid, days) (s)\n\n2024-01-23 16:03:39 0.227009 29x120 R 19.87 0.10 21.9\n\nThe photometry is based on nearby USNO-B1.0 R2 stars.\n\nWe are also reporting the incorrect name of the GRB in GCN Circular No. 35605. The correct name of the GRB in GCN Circular #3560 should be GRB 240123A.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35609.",
"published": "2024-01-23T18:06:22.594104Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T18:06:22.594123Z",
"modified": "2024-01-23T18:06:22.598055Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5900,
"topic": "gcn.circular",
"uuid": "76fc0855-75bd-4c5f-9b5b-d4a17ddb24e4",
"title": "Fermi GBM Sub-Threshold Detection of GRB 240123A",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "24/01/23 19:36:21 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35610"
},
"title": "GCN CIRCULAR",
"number": "35610",
"subject": "Fermi GBM Sub-Threshold Detection of GRB 240123A"
},
"message_text": "L. Scotton (UAH) reports on behalf of the Fermi-GBM Team:\n\nSwift-BAT detected GRB 240123A at 11:05:46 UT (D'Ai et al. 2024, GCN 35602). There was no\nFermi-GBM onboard trigger around the event.\n\nAn automated, blind search for short gamma-ray bursts below the onboard\ntriggering threshold in Fermi-GBM identified no counterparts.\n\nThe GBM targeted search [1], the most sensitive, coherent search for\nGRB-like signals identified a transient most significantly on the 8.192 s\ntimescale, with a false alarm rate of 3.9e-05 Hz and a location consistent with\nthe Swift-BAT event, using the standard search protocol with a S/N of 13.\nThe GBM targeted search event was found with the highest\nsignificance with a \"normal\" spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3) for a GRB.\n\n[1] Goldstein et al. 2019 arXiv:1903.12597\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35610.",
"published": "2024-01-23T19:36:32.993244Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T19:36:32.993263Z",
"modified": "2024-01-23T19:36:32.999311Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5901,
"topic": "gcn.circular",
"uuid": "0e49c8b3-6b69-44bb-94e7-04aa5db7648c",
"title": "GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "24/01/23 19:50:44 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35611"
},
"title": "GCN CIRCULAR",
"number": "35611",
"subject": "GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection"
},
"message_text": "Y.-D. Hu, F. Aceituno, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia, S.-Y. Wu, S. Guziy (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 240122A by MAXI/GSC (Negoro et al., GCNC 35593), we triggered the 0.6m BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain), and pointing to the burst position on Jan. 22 at 19:45 UT (i.e. ~9.3 hrs after trigger). In the co-added image (14 x 60 s, clear filter, affected by the bright moonlight), the optical afterglow reported by GOTO (Kumar et al. GCNC 35596), GTC (Thoene et al. GCNC 35598) and VLT (Saccardi et al. GCNC 35599) is not detected down to 17.6 mag, which is consistent with the limit reported by LT (GCNC 35597).\n\nLater on, we triggered the 1.5m telescope at Observatorio de Sierra Nevada (OSN) near Granada, Spain, starting on Jan. 22 at 23:46 UT (i.e. 13.3 hrs after trigger) in BVRI bands. The afterglow is clearly detected with I~20.1+-0.1 mag in the co-added image (7 x 90 s), and consistent with the enhanced XRT/Swift position (Ambrosi et al. GCNC 35600). Further imaging is ongoing.\n\nWe thank the staff at both IHSM/UMA-CSIC La Mayora and OSN for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35611.",
"published": "2024-01-23T19:50:55.071022Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-23T19:50:55.071042Z",
"modified": "2024-01-23T19:50:55.079191Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6575,
"topic": "gcn.circular",
"uuid": "0f94cc4c-995a-409d-85c5-05c39a074217",
"title": "EP 240414a: NOT optical counterpart confirmation",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "24/04/15 04:54:28 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36105"
},
"title": "GCN CIRCULAR",
"number": "36105",
"subject": "EP 240414a: NOT optical counterpart confirmation"
},
"message_text": "D. Xu (NAOC), D.B. Malesani (DAWN/NBI & Radboud), P. Jonker (Radboud), Z.P. Zhu, X. Liu, S.Y. Fu, S.Q. Jiang, J. An, T.H. Lu (NAOC), M. Turkki (U. of Helsinki, NOT) report on behalf of a large collaboration:\n\nWe observed the field of the X-ray transient detected by Einstein Probe, EP 240414a, using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 22:07:38UT on 2024-04-14, i.e., 12.29 hr after the EP trigger and 5 x 300 s r-band frames were obtained.\n\nThe previously reported optical counterpart candidate by LOT (Aryan et al., GCN 36094) is clearly detected in our stacked image with coordinates\n\nR.A. = 12:46:01.67 (J2000)\nDec. = -09:43:08.8 (J2000)\n\nwhich has r = 21.9 +/- 0.1 (AB) at a median time of 0.521 day post-trigger. Comparison of the two observations shows that the source was decaying slowly.\n\nWe also searched for other potential counterparts in the NOT image which covers most of the EP/WXT error region, and didn't find any other credible candidate via image subtraction.\n\nWe thus confirm that the LOT candidate is the optical counterpart of EP 240414a.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36105.",
"published": "2024-04-15T04:54:43.381354Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T04:54:43.381376Z",
"modified": "2024-04-15T04:54:43.390499Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5905,
"topic": "gcn.circular",
"uuid": "693bb6d6-ba31-43fe-a189-9a42fb534133",
"title": "GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "24/01/24 02:13:00 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35615"
},
"title": "GCN CIRCULAR",
"number": "35615",
"subject": "GRB 240124A?: BALROG localization (Fermi Trigger 727752941 / GRB 240124066)"
},
"message_text": "\nB. Biltzinger, T. Preis, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n727752941 at 01:35:36 on 24 Jan. 2024 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position (1 sigma statistical errors) is:\nRA(2000.0) = 316.73+/-0.58 deg\nDecl.(2000.0) = -22.75+/-0.39 deg\nWe estimate an additional systematic error of 1 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB240124066/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB240124066/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB240124066/json\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35615.",
"published": "2024-01-24T02:13:11.726704Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T02:13:11.726722Z",
"modified": "2024-01-24T02:13:11.732386Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5906,
"topic": "gcn.circular",
"uuid": "a518963e-2160-4f97-9358-99cc710068dd",
"title": "GRB 240123A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/01/24 03:40:02 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35616"
},
"title": "GCN CIRCULAR",
"number": "35616",
"subject": "GRB 240123A: Enhanced Swift-XRT position"
},
"message_text": "J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 596 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 240123A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 199.34861, +60.61849 which is equivalent\nto:\n\nRA (J2000): 13h 17m 23.67s\nDec (J2000): +60d 37' 06.6\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35616.",
"published": "2024-01-24T03:40:13.800223Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T03:40:13.800241Z",
"modified": "2024-01-24T03:40:13.806349Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5907,
"topic": "gcn.circular",
"uuid": "6fc7030f-2006-428f-8c1d-f751bd012806",
"title": "Fermi/GBM trigger 727752941: BALROG analysis retraction",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcg@mpe.mpg.de>",
"data": {
"date": "24/01/24 08:05:14 GMT",
"from": "Jochen Greiner at MPE <jcg@mpe.mpg.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35617"
},
"title": "GCN CIRCULAR",
"number": "35617",
"subject": "Fermi/GBM trigger 727752941: BALROG analysis retraction"
},
"message_text": "J. Greiner, T. Preis (both MPE) report:\n\nDue to a programming error the auto-generated draft text was sent out to the\nworld (GCN 35615), despite the obvious solar flare like light curve and\nspectrum, i.e. trigger 727752941 is a solar flare, and not a GRB. We apologize\nfor our mistake.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35617.",
"published": "2024-01-24T08:05:28.014075Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T08:05:28.014099Z",
"modified": "2024-01-24T08:05:28.020156Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5908,
"topic": "gcn.circular",
"uuid": "5b731b71-4678-49a0-b5d0-3686531d57c4",
"title": "GRB 240123A : MITSuME Akeno optical afterglow candidate detection",
"submitter": "Hop gcn.circular",
"authors": "Mahito Sasada at Tokyo Institute of Technology <sasada@hp.phys.titech.ac.jp>",
"data": {
"date": "24/01/24 08:57:45 GMT",
"from": "Mahito Sasada at Tokyo Institute of Technology <sasada@hp.phys.titech.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35618"
},
"title": "GCN CIRCULAR",
"number": "35618",
"subject": "GRB 240123A : MITSuME Akeno optical afterglow candidate detection"
},
"message_text": "M. Sasada, I. Takahashi, N. Higuchi, M. Niwano, S. Sato, S. Hayatsu, H. Takei, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 240123A (D'Ai et al. GCN 35602) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno. \n\nThe observation with a series of 60 sec exposures started at 2024-01-23 15:09:01 UT (4.05 hours after the Swift/BAT trigger). We stacked the images in good conditions. An optical candidate of the afterglow can be found at the location of (RA, Dec) = (199.3495, 60.6181) near the Swift/XRT error position (Capalbi et al. GCN 35612). Here we report magnitudes by the aperture photometry at the position.\n\nT0+[hours] | MID-UT | T-EXP[sec] | magnitudes of aperture photometry\n----------------------------------------------------------------------------------------------------------------\n5.0 | 2024-01-23 16:05:41 | 5880 | gâ=19.83+/-0.17, Rc=19.35+/-0.11, Ic=19.24+/-0.13\n----------------------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the trigger\nT-EXP: Total Exposure time\n\nThe position of the optical candidate is consistent with Pankov et al., GCN 35605.\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, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35618.",
"published": "2024-01-24T08:57:56.036063Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T08:57:56.036082Z",
"modified": "2024-01-24T08:57:56.040963Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5909,
"topic": "gcn.circular",
"uuid": "cfc6df06-913f-4899-97c3-ab4e3be9703d",
"title": "GRB 240123A: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "24/01/24 11:10:25 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35619"
},
"title": "GCN CIRCULAR",
"number": "35619",
"subject": "GRB 240123A: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin, O. A. Maslennikova, O. I. Spiridonova (SAO RAS)\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 240123A (D'Ai et al., GCN #35602;\nScotton, GCN #35610) with the 1-m telescope of SAO RAS equipped\nwith the CCD photometer. We obtained 12 x 300 sec. images in Rc\nband on Jan 24, 02:15:54 -- 03:42:02 UT (t_mid - T0 = 0.66194 days).\n\nThe OT (D'Ai et al., GCN #35602; Pankov et al., GCNs #35605, #35609;\nSasada et al., GCN #35618) is clearly detected in our stacked frame\nwith the brightness of R = 21.12 +/- 0.09.\n\nThe photometry is based on R2 magnitudes of nearby USNO-B1 stars.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35619.",
"published": "2024-01-24T11:10:36.160233Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T11:10:36.160256Z",
"modified": "2024-01-24T11:10:36.167194Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6798,
"topic": "gcn.circular",
"uuid": "e3842138-f1f4-4ee1-aa46-b78ecdb64b12",
"title": "Fermi GRB 240421A: 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": "24/04/21 18:16:47 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36212"
},
"title": "GCN CIRCULAR",
"number": "36212",
"subject": "Fermi GRB 240421A: 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 240421A ( Fermi GBM team, GCN 36204) errorbox 42622 sec after notice time and 42658 sec after trigger time at 2024-04-21 17:12:58 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -13.9 deg.\n\nThe galactic latitude b = -32 deg., longitude l = 313 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$30011\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (20h 50m 46.74s , -82d 18m 27.9s) | C | 60 | 14.2 |\n 42689 | 2024-04-21 17:12:58 | MASTER-SAAO | (21h 03m 23.96s , -82d 31m 37.4s) | C | 60 | 14.4 |\n 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 29m 07.64s , -78d 43m 31.0s) | C | 60 | 14.5 |\n 42768 | 2024-04-21 17:14:18 | MASTER-SAAO | (20h 20m 41.90s , -78d 30m 17.8s) | C | 60 | 14.2 |\n 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 24m 07.82s , -84d 24m 28.5s) | C | 60 | 16.7 |\n 43087 | 2024-04-21 17:19:37 | MASTER-SAAO | (20h 07m 14.94s , -84d 11m 11.3s) | C | 60 | 16.6 |\n 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (19h 08m 34.69s , -82d 29m 18.5s) | C | 60 | 15.9 |\n 43167 | 2024-04-21 17:20:56 | MASTER-SAAO | (18h 55m 46.97s , -82d 15m 59.6s) | C | 60 | 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/36212.",
"published": "2024-04-21T18:17:03.234086Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-21T18:17:03.234103Z",
"modified": "2024-04-21T18:17:03.242205Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5912,
"topic": "gcn.circular",
"uuid": "a51bdb92-3fa5-42e0-b84a-c391e2e826eb",
"title": "GRB 240123A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Amy <yarleen@gmail.com>",
"data": {
"date": "24/01/24 18:12:15 GMT",
"from": "Amy <yarleen@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35622"
},
"title": "GCN CIRCULAR",
"number": "35622",
"subject": "GRB 240123A: Swift-BAT refined analysis"
},
"message_text": "T. Parsotan (GSFC), S. D. Barthelmy (GSFC),\nA. D'Ai (INAF-IASFPA), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), M. J. Moss (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+820 sec from the recent telemetry\ndownlink,\nwe report further analysis of BAT GRB 240123A (trigger #1210276)\n(D'Ai, et al., GCN Circ. 35602). The BAT ground-calculated position is\nRA, Dec = 199.287, 60.607 deg which is\n RA(J2000) = 13h 17m 08.9s\n Dec(J2000) = +60d 36' 25.6\"\nwith an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 31%.\n\nThe mask-weighted light curve shows some weak emission with complex\nstructures\nthat starts at ~T0 and ends at ~T+140 s. The main peak occurs at ~T+5 s.\nT90 (15-350 keV) is 115.30 +- 54.93 sec (estimated error including\nsystematics).\n\nThe time-averaged spectrum from T-0.69 to T+140.46 sec is best fit by a\nsimple\npower-law model. The power law index of the time-averaged spectrum is\n1.69 +- 0.23. The fluence in the 15-150 keV band is 1.6 +- 0.2 x 10^-6\nerg/cm2.\nThe 1-sec peak photon flux measured from T+5.49 sec in the 15-150 keV band\nis 1.1 +- 0.3 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/1210276/BA/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35622.",
"published": "2024-01-24T18:12:26.009817Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T18:12:26.009837Z",
"modified": "2024-01-24T18:12:26.015944Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5913,
"topic": "gcn.circular",
"uuid": "03686b50-6315-4849-aaad-4796cc3ef15d",
"title": "GRB 240122B: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/01/24 20:04:13 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35623"
},
"title": "GCN CIRCULAR",
"number": "35623",
"subject": "GRB 240122B: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "S. Ricciarini (U of Florence), A. Yoshida, T. Sakamoto,\nS. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),\nS. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike,\nK. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),\nN. Cannady (GSFC/UMBC), M. L. Cherry (LSU),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 240122B (Glowbug gamma-ray detection:\nCheung et al., GCN Circ. 35606) triggered the CALET\nGamma-ray Burst Monitor (CGBM) at 19:16:26.96 UTC\non 22 January 2024\n(http://cgbm.calet.jp/cgbm_trigger/flight/1389985993/).\nThe burst signal was seen by HXM2 and SGM.\n\nThe burst light curve shows a double-peaked structure that starts\nat T-57.2 sec, peaks at T+9.0 sec, and ends at T+17.1 sec.\nThe T90 and T50 durations measured by the SGM data are\n69.2 +/- 1.9 sec and 32.2 +/- 19.7 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1389985993/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35623.",
"published": "2024-01-24T20:04:24.205749Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-24T20:04:24.205765Z",
"modified": "2024-01-24T20:04:24.212019Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5914,
"topic": "gcn.circular",
"uuid": "2bd2cb54-4b6c-47a6-a938-f7a2c28b20c4",
"title": "GRB 240123A: further SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "24/01/25 05:12:41 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35624"
},
"title": "GCN CIRCULAR",
"number": "35624",
"subject": "GRB 240123A: further SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin, O. A. Maslennikova, O. I. Spiridonova (SAO RAS)\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 240123A (D'Ai et al., GCN #35602;\nScotton, GCN #35610) with the 1-m telescope of SAO RAS equipped\nwith the CCD photometer. We obtained 16 x 300 sec. images in Rc\nband on Jan 25, 01:55:52 -- 03:30:49 UT (t_mid - T0 = 1.6511 days).\n\nThe OT (D'Ai et al., GCN #35602; Pankov et al., GCNs #35605, #35609\n#35620; Sasada et al., GCN #35618) is detected in our stacked frame\nwith the brightness of R = 22.0 +/- 0.2.\n\nThe photometry is based on R2 magnitudes of nearby USNO-B1.0 stars.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35624.",
"published": "2024-01-25T05:13:00.322538Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T05:13:00.322561Z",
"modified": "2024-01-25T05:13:00.354496Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5915,
"topic": "gcn.circular",
"uuid": "fb40365b-3aa2-4e19-a2bc-9ab6c1cd9d35",
"title": "Fermi-LAT gamma-ray observations of IceCube-240123A",
"submitter": "Hop gcn.circular",
"authors": "chiara.bartolini-1@unitn.it",
"data": {
"date": "24/01/25 07:57:28 GMT",
"from": "chiara.bartolini-1@unitn.it",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35625"
},
"title": "GCN CIRCULAR",
"number": "35625",
"subject": "Fermi-LAT gamma-ray observations of IceCube-240123A"
},
"message_text": "C. Bartolini (Univ of Trento & INFN Bari), S. Garrappa (Weizmann Institute of Science), S. Buson (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 IC240123A high-energy neutrino event (GCN 35604) 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 2024-01-23 at 11:25:36.05 UT (T0) with J2000 position RA = 357.54 (+1.93, -1.71)deg, Decl. = +4.26 (+0.80, -0.76)deg (90% PSF containment). According to the fourth Fermi LAT source catalog (4FGL-DR4), there are no 4FGL-DR4 cataloged gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources in the 90% IC240123A uncertainty localization region. The nearest 4FGL cataloged gamma-ray source is 4FGL J2349.4+0534 (TXS 2346+052) at 1.33deg away from the neutrino best-fit position. Based on a preliminary analysis of the LAT data over one month and day timescale prior T0, this object is not significantly detected at gamma rays.\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 IC240123A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240123A best-fit position, the >100 MeV flux upper limit (95% confidence) is <4.36e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-01-23 UTC), and <2.42e-9 (<9.60e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For 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/35625.",
"published": "2024-01-25T07:57:38.267088Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T07:57:38.267106Z",
"modified": "2024-01-25T07:57:38.277517Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5916,
"topic": "gcn.circular",
"uuid": "cecdd833-35ab-4bd8-93c0-07de56549a5b",
"title": "Swift trigger 1210856 is not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"data": {
"date": "24/01/25 11:25:42 GMT",
"from": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35626"
},
"title": "GCN CIRCULAR",
"number": "35626",
"subject": "Swift trigger 1210856 is not astrophysical"
},
"message_text": "\nN. J. Klingler (GSFC/UMBC/CRESSTII), K. L. Page (U Leicester) and\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift trigger 1210856 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/35626.",
"published": "2024-01-25T11:25:53.929540Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T11:25:53.929556Z",
"modified": "2024-01-25T11:25:53.938313Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5917,
"topic": "gcn.circular",
"uuid": "219853f9-d73b-4841-ac02-e6bbd88a7e93",
"title": "IPN triangulation of GRB 240123C (short)",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/01/25 11:35:17 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35627"
},
"title": "GCN CIRCULAR",
"number": "35627",
"subject": "IPN triangulation of GRB 240123C (short)"
},
"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 short-duration GRB 240123C\nwas detected by Konus-Wind, INTEGRAL (SPI-ACS),\nSwift (BAT), and Mars-Odyssey (HEND)\nat about 83553 s UT (23:12:33).\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 244.077 (16h 16m 19s) -58.857 (-58d 51' 25\")\n Corners:\n 240.883 (16h 03m 32s) -55.715 (-55d 42' 55\")\n 241.066 (16h 04m 16s) -56.037 (-56d 02' 14\")\n 248.066 (16h 32m 16s) -61.657 (-61d 39' 24\")\n 247.747 (16h 30m 59s) -61.386 (-61d 23' 11\")\n ---------------------------------------------\nThe error box area is 1219 sq. arcmin, and its maximum\ndimension is 7.0 deg (the minimum one is 3 arcmin).\nThe Sun distance was 58 deg.\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240123_T83553/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/35627.",
"published": "2024-01-25T11:35:27.815948Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T11:35:27.815962Z",
"modified": "2024-01-25T11:35:27.822655Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5918,
"topic": "gcn.circular",
"uuid": "232033c5-6769-44ce-a2af-2e3f34d2c5fe",
"title": "GRB 240123A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/25 14:21:21 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35628"
},
"title": "GCN CIRCULAR",
"number": "35628",
"subject": "GRB 240123A: 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 240123A (Swift/BAT detection: GCN 35602; Fermi/GBM detection: GCN 35610; INTEGRAL/SPI-ACS peak detection at 2024-01-23 ~11:05:47) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe subthreshold detection was confirmed at the peak time 2024-01-23 11:05:49 UTC. The T90 duration measured by GRBAlpha is 8 s and the overall significance during T90 reaches 3.5 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240123A_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/35628.",
"published": "2024-01-25T14:21:33.610050Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T14:21:33.610067Z",
"modified": "2024-01-25T14:21:33.619151Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6576,
"topic": "gcn.circular",
"uuid": "9543fa3f-d5ec-42a8-b723-a512d005859e",
"title": "EP240413a: Upper limits from GECAM-B Observation",
"submitter": "Hop gcn.circular",
"authors": "Yue Wang <m18509381757@163.com>",
"data": {
"date": "24/04/15 04:55:17 GMT",
"from": "Yue Wang <m18509381757@163.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36106"
},
"title": "GCN CIRCULAR",
"number": "36106",
"subject": "EP240413a: Upper limits from GECAM-B Observation"
},
"message_text": "Yue Wang, Shao-Lin Xiong, Chen-wei Wang, Wen-long Zhang, Cheng-kui Li and Chao Zheng, report on behalf of the GECAM team:\n\nGECAM-B was observing normally and covered the sky region of EP240413a (Lian et al., GCN 36086) at event time 2024-04-13T14:39:37 (UTC). The smallest incident angle of GECAM-B GRD detectors is about 21.3 deg for the WXT location (RA\"8.794 deg, Dec=-18.8 deg).\n\nThere was no GECAM-B in-flight trigger around the event time of EP240413a. An automated, blind search for gamma-ray bursts of GECAM-B data found no burst candidates. The targeted search was run within -50 s ~ 250 s around event time, and also identified no counterpart candidates.\n\nWith the three typical GRB spectral models, integration time of 10 s and the WXT localization, the 3-sigma upper-limits of fluence (15 - 300 keV, incident energy) are reported below:\n\nBand model 1 (alpha=-1.9, beta=-3.7, Epp keV): 7.5e-6 erg cm^-2\nBand model 2 (alpha=-1.0, beta=-2.3, Ep#0 keV): 6.6e-6 erg cm^-2\nBand model 3 (alpha=0.0, beta=-1.5, Ep\u001000 keV): 3.5e-6 erg cm^-2\n\nAll measurements above are made with all GRD detectors.\n\nWe note that these results are preliminary and refined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36106.",
"published": "2024-04-15T04:55:23.460312Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T04:55:23.460330Z",
"modified": "2024-04-15T04:55:23.467100Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5924,
"topic": "gcn.circular",
"uuid": "7c928ae8-540b-4d5d-a2c2-72a98c861812",
"title": "GRB 240125B: Fermi GBM Final Localization",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "24/01/26 02:54:31 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35634"
},
"title": "GCN CIRCULAR",
"number": "35634",
"subject": "GRB 240125B: Fermi GBM Final Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\n\"At 20:48:42.61 UT on 25 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240125B (trigger 727908527/240125867).\n\nThe on-ground calculated location, using the Fermi GBM trigger data,\nis RA = 81.10, Dec = 21.10 (J2000 degrees, equivalent to J2000 5h 24m, +21d 6'),\nwith a statistical uncertainty of 16.96 degrees.\n\nThe angle from the Fermi LAT boresight is 78 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240125867/quicklook/glg_skymap_all_bn240125867.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/bn240125867/quicklook/glg_healpix_all_bn240125867.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240125867/quicklook/glg_lc_medres34_bn240125867.gif\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35634.",
"published": "2024-01-26T02:54:42.430395Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-26T02:54:42.430417Z",
"modified": "2024-01-26T02:54:42.441495Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5919,
"topic": "gcn.circular",
"uuid": "6804c866-c0b0-48b7-9801-57f67417c9dd",
"title": "GRB 240123B: Swift/BAT-GUANO detection of a long burst",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "24/01/25 16:01:37 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35629"
},
"title": "GCN CIRCULAR",
"number": "35629",
"subject": "GRB 240123B: Swift/BAT-GUANO detection of a long burst"
},
"message_text": "Samuele Ronchini (PSU), James DeLaunay (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240123B onboard (T0: 2024-01-23T17:48:03.22 UTC, Fermi GCN 35608).\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 15.5 in a 8.192 s analysis time bin, starting at T0 - 2.05 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 2.75.\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/35629.",
"published": "2024-01-25T16:01:52.689133Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T16:01:52.689154Z",
"modified": "2024-01-25T16:01:52.697573Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6577,
"topic": "gcn.circular",
"uuid": "b67be7b1-89a9-4893-bea9-4e7e9c7fb8b8",
"title": "GRB 240415A: 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": "24/04/15 06:38:26 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36107"
},
"title": "GCN CIRCULAR",
"number": "36107",
"subject": "GRB 240415A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 06:26:57 UT on 15 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240415A (trigger 734855222.604114 / 240415269).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 201.6, Dec = 75.7 (J2000 degrees, equivalent to J2000 13h 26m, 75d 42'), with a statistical uncertainty of 8.2 degrees.\n\nThe angle from the Fermi LAT boresight is 110.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240415269/quicklook/glg_skymap_all_bn240415269.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/bn240415269/quicklook/glg_healpix_all_bn240415269.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240415269/quicklook/glg_lc_medres34_bn240415269.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36107.",
"published": "2024-04-15T06:38:42.494229Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T06:38:42.494245Z",
"modified": "2024-04-15T06:38:42.503377Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6578,
"topic": "gcn.circular",
"uuid": "c13d62c0-42f7-413c-973d-73f848c4fc70",
"title": "GRB 240415A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "24/04/15 07:14:36 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36108"
},
"title": "GCN CIRCULAR",
"number": "36108",
"subject": "GRB 240415A: Swift detection of a burst"
},
"message_text": "\nM. J. Moss (GSFC), K. L. Page (U Leicester) and D. M. Palmer (LANL)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 06:26:53 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240415A (trigger\u001221874). Due to a telemetry gap, only\nlimited information is available, specifically the detector plane\nhistogram and associated metadata. Ground analysis of this histogram\nfinds a source at\nRA, Dec 129.128, +73.169 which is\n RA(J2000) = 08h 36m 31s\n Dec(J2000) = +73d 10' 08\"\nThe metadata indicates a trigger duration of 1 s, which does not distinguish\nbetween a short or a long burst.\n\nWe note that this trigger time and position is consistent with Fermi GBM's\ndetection of GRB 240415A (GCN 36107).\n\nBurst Advocate for this burst is M. J. Moss (mikejmoss3 AT gmail.com).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36108.",
"published": "2024-04-15T07:14:49.820518Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T07:14:49.820537Z",
"modified": "2024-04-15T07:14:49.828470Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6799,
"topic": "gcn.circular",
"uuid": "38f56c49-350c-4133-b1fe-06b9193380da",
"title": "GRB 240421B: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/21 18:31:11 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36213"
},
"title": "GCN CIRCULAR",
"number": "36213",
"subject": "GRB 240421B: Enhanced Swift-XRT position"
},
"message_text": "A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1017 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 240421B, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 299.70085, -14.85962 which is equivalent\nto:\n\nRA (J2000): 19h 58m 48.20s\nDec (J2000): -14d 51' 34.6\"\n\nwith an uncertainty of 2.1 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36213.",
"published": "2024-04-21T18:31:26.555133Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-21T18:31:26.555152Z",
"modified": "2024-04-21T18:31:26.563584Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5922,
"topic": "gcn.circular",
"uuid": "ca31fd24-2e17-45f6-8f4a-ffe8c8d95200",
"title": "GRB 240123B: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "24/01/25 19:45:45 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35632"
},
"title": "GCN CIRCULAR",
"number": "35632",
"subject": "GRB 240123B: Fermi GBM Observation"
},
"message_text": "L. Scotton (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 17:48:03.22 UT on 23 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240123B (trigger 727724888/240123742).\nwhich was also detected by Swift/BAT-GUANO (Ronchini et al. 2024, GCN 35629).\nThe Fermi GBM Final Real-time Localization was reported in GCN 35608.\n\nThe angle from the Fermi LAT boresight is 51 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 12 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.5 to T0+11.5 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.6 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 250 +/- 30 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.9 s in the 10-1000 keV band is 2.4 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 130 +/- 30 keV, alpha = 0.1 +/- 0.4 and beta = -1.9 +/- 0.1.\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/35632.",
"published": "2024-01-25T19:45:56.786818Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T19:45:56.786833Z",
"modified": "2024-01-25T19:45:56.794879Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5923,
"topic": "gcn.circular",
"uuid": "c7318fef-4c8f-4b5a-9310-ada07b669b70",
"title": "GRB240122A: PRIME near infrared detection",
"submitter": "Hop gcn.circular",
"authors": "Joe Durbak at UMD <gcn.joedurbak@gmail.com>",
"data": {
"date": "24/01/25 20:05:40 GMT",
"from": "Joe Durbak at UMD <gcn.joedurbak@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35633"
},
"title": "GCN CIRCULAR",
"number": "35633",
"subject": "GRB240122A: PRIME near infrared detection"
},
"message_text": "\nO. Guiffreda (UMD), J. Durbak (UMD), A. S. Kutyrev (NASA/GSFC), E. Troja (U Rome), K. De (MIT), S. B. Cenko (NASA/GSFC)\n\n\nFollowing the MAXI/GSC detection (Negoro et al. GCN 35593), GOTO optical candidate GOTO24eu/AT2024apy (Kumar et al. GCN 35596), and the Swift afterglow detection (Ambrosi et al. GCN 35600), we observed the transient field using J and H filters with PRIME ~1.5 days after MAXI/GSC detection.\n\n\nAt the position of the optical counterpart detected by GOTO, we detect an uncatalogued source in both J and H bands. Using nearby 2MASS stars for preliminary calibration we derive the following magnitudes, not corrected for Galactic extinction: \n\n\nFilter | Mag(AB) | SNR | Seeing | Total exposure time (s) \n\n-------|----------------|-----|--------|-------------------------\n\nJ | 21.02 +/- 0.20 | 6.3 | 1.373â | 1802\n\nH | 20.90 +/- 0.21 | 6.1 | 1.480â | 1544\n\n\n\nPRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa.\n\n\nFurther observations are planned.\n\n\nWe thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35633.",
"published": "2024-01-25T20:05:52.451217Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-25T20:05:52.451230Z",
"modified": "2024-01-25T20:05:52.463191Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6579,
"topic": "gcn.circular",
"uuid": "4bdbb10a-2ccb-4b6b-96de-543f3f55ac1f",
"title": "GRB 240415A: Prompt Swift-XRT observations",
"submitter": "Hop gcn.circular",
"authors": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"data": {
"date": "24/04/15 08:00:44 GMT",
"from": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36109"
},
"title": "GCN CIRCULAR",
"number": "36109",
"subject": "GRB 240415A: Prompt Swift-XRT observations"
},
"message_text": "P.A. Evans (U. Leicester), K.L. Page (U. Leicester) and M. J. Moss (GSFC)\nreport on behalf of the Swift-XRT team:\n\nThe automated Swift slew to GRB 240415A (BAT trigger 1221874; Moss et al.,\nGCN Circ. 36108) was delayed due to an Earth limb constraint.\n\nThe XRT began observing the field at 07:21:58.2 UT, 3305 seconds\nafter the BAT trigger. Using promptly downlinked data we find an\nuncatalogued X-ray source located at RA, Dec 129.19096 73.14608 which\nis equivalent to:\n RA(J2000) = 08h 36m 45.83s\n Dec(J2000) = +73d 08' 45.9\"\nwith an uncertainty of 3.6 arcseconds (radius, 90% containment). This is\n105 arcseconds from the BAT position, inside the BAT error circle. This\nposition may be improved as more data are received; the latest position\nis available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (2.49 x\n10^20 cm^-2, Willingale et al. 2013), with an excess column of 6.5\n(+3.49/-2.94) x 10^21 cm^-2 (90% confidence).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36109.",
"published": "2024-04-15T08:01:03.227206Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T08:01:03.227221Z",
"modified": "2024-04-15T08:01:03.235528Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5925,
"topic": "gcn.circular",
"uuid": "c5b86f3b-5888-4298-af8d-7caed5ecf110",
"title": "GRB 240123C: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/26 08:25:49 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35635"
},
"title": "GCN CIRCULAR",
"number": "35635",
"subject": "GRB 240123C: 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 short-duration GRB 240123C which was also detected by Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND) (A.S. Kozyre, GCN Circ. 35627).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-23 23:12:36.55 UTC. The measured peak count rate associated with the burst is 1936 (+240, -237) counts/s above the background in the combined data of all quadrants, with a total of 798 (+116, -73) counts. The local mean background count rate was 312 (+8, -15) counts/s. Using cumulative rates, we measure a T90 of 1.4 (+0.61, -0.38) 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 2024-01-23 23:12:36.81 UTC. The measured peak count rate associated with the burst is 560 (+70, -77) counts/s above the background in the combined data of all quadrants, with a total of 1166 (+263, -284) counts. The local mean background count rate was 1288 (+11, -11) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.\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/35635.",
"published": "2024-01-26T08:26:04.102433Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-26T08:26:04.102446Z",
"modified": "2024-01-26T08:26:04.110539Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5926,
"topic": "gcn.circular",
"uuid": "e6e90465-6549-4547-8538-4a8d864920c1",
"title": "GRB 240124B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/26 08:28:51 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35636"
},
"title": "GCN CIRCULAR",
"number": "35636",
"subject": "GRB 240124B: 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 GRB 240124B. We also inspected INTEGRAL/SPI-ACS data, and see a detection there.\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-24 21:14:33.25 UTC. The measured peak count rate associated with the burst is 386 (+141, -69) counts/s above the background in the combined data of three quadrants (out of four), with a total of 322 (+81, -76) counts. The local mean background count rate was 257 (+5, -10) counts/s. Using cumulative rates, we measure a T90 of 2.35 (+0.34, -0.9) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-23 21:14:31.78 UTC. The measured peak count rate associated with the burst is 710 (+72, -80) counts/s above the background in the combined data of all quadrants, with a total of 1164 (+159, -179) counts. The local mean background count rate was 1303 (+6, -8) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.\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/35636.",
"published": "2024-01-26T08:28:59.303803Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-26T08:28:59.303831Z",
"modified": "2024-01-26T08:28:59.310034Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5928,
"topic": "gcn.circular",
"uuid": "09a508d4-cfaa-4927-8795-064733edc675",
"title": "Swift Trigger 1211211 and 1211212 are not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"data": {
"date": "24/01/26 20:13:05 GMT",
"from": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35638"
},
"title": "GCN CIRCULAR",
"number": "35638",
"subject": "Swift Trigger 1211211 and 1211212 are not astrophysical"
},
"message_text": "\nP. D'Avanzo (INAF-OAB), M. Ferro (INAF-OAB), J.D. Gropp (PSU),\nA. Y. Lien (U Tampa), T. M. Parsotan (GSFC), C. Salvaggio (INAF-OAB),\nT. Sbarrato (INAF-OAB) and B. Sbarufatti (INAF-OAB) report on behalf\nof the Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1211211 and 1211212 were caused by a star track\nloss-of-lock event, and are not interesting events.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35638.",
"published": "2024-01-26T20:13:21.038171Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-26T20:13:21.038194Z",
"modified": "2024-01-26T20:13:21.047476Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6802,
"topic": "gcn.circular",
"uuid": "ec989279-15ac-49cf-8a3a-aa0bbc2d3dd8",
"title": "GRB240421B: BOOTES-5/JGT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at INAF-OAB <huyoudong072@hotmail.com>",
"data": {
"date": "24/04/21 21:10:58 GMT",
"from": "Youdong HU at INAF-OAB <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36216"
},
"title": "GCN CIRCULAR",
"number": "36216",
"subject": "GRB240421B: BOOTES-5/JGT optical upper limit"
},
"message_text": "E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), Y.-D. Hu (INAF-OAB), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), A. Martin-Carrillo and L. Hanlon (UCD, Ireland) and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 240421B by Swift (Williams et al. GCNC 36208), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically observed the GRB location starting on April. 21, 09:43:44 UT (~ 50 s after trigger). No new optical source is detected on the co-added images (20 x 1 s, clear-filter) within the enhanced Swift/XRT error box (Beardmore et al. GCNC 36213) down to 18.4 mag. which is consistent with both reports from UVOT (Kuin et al., GCNC 36214) and WINTER (Karambelkar et al. GCNC 36215).\n\nWe thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36216.",
"published": "2024-04-21T21:11:12.274683Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-21T21:11:12.274702Z",
"modified": "2024-04-21T21:11:12.282934Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5927,
"topic": "gcn.circular",
"uuid": "3e2eaa9c-5fbe-41b6-9950-5c5c02f287c4",
"title": "GRB 240125A: AstroSat CZTI detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/01/26 08:30:34 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35637"
},
"title": "GCN CIRCULAR",
"number": "35637",
"subject": "GRB 240125A: AstroSat CZTI detection of a short burst"
},
"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 short-duration GRB 240125A which was also detected by Glowbug (C.C. Cheung, GCN Circ. 35630).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-25 09:35:00.35 UTC. The measured peak count rate associated with the burst is 287 (+139, -40) counts/s above the background in the combined data of three quadrants (out of four), with a total of 208 (+50, -50) counts. The local mean background count rate was 263 (+7, -10) counts/s. Using cumulative rates, we measure a T90 of 1.4 (+0.11, -0.47) s.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-23 09:34:58.75UTC. The measured peak count rate associated with the burst is 532 (+74, -81) counts/s above the background in the combined data of all quadrants, with a total of 1132 (+156, -172) counts. The local mean background count rate was 1587 (+5, -6) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.\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/35637.",
"published": "2024-01-26T08:30:40.554069Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-26T08:30:40.554081Z",
"modified": "2024-01-26T08:30:40.560085Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6580,
"topic": "gcn.circular",
"uuid": "4823f071-4af8-48ce-9724-d76848f0531a",
"title": "X-ray transient EP 240414a - GTC spectroscopic observations",
"submitter": "Hop gcn.circular",
"authors": "Andrew Levan at Radboud University <a.levan@astro.ru.nl>",
"data": {
"date": "24/04/15 09:47:43 GMT",
"from": "Andrew Levan at Radboud University <a.levan@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36110"
},
"title": "GCN CIRCULAR",
"number": "36110",
"subject": "X-ray transient EP 240414a - GTC spectroscopic observations"
},
"message_text": "P.G. Jonker (Radboud), A.J. Levan (Radboud), D.B. Malesani (Radboud/DAWN NBI), N.R. Tanvir (Leicester), D. Garcia (IAC), A de Ugarte Postigo (CNRS, OCA, LAM) report for a larger collaboration: \n\nWe obtained spectroscopic observations of the counterpart and candidate host galaxy of EP 240414a (Lian et al.,. GCN 36091; Aryan et al., GCN 36094; Xu et al., GCN 36105) with the GTC telescope equipped with the OSIRIS+ instrument. Observations began at 00:46 UT on April 15, approximately 15 hr after the transient onset. 4x1200 s of exposures were obtained with the slit oriented through both the nucleus of the candidate host galaxy SDSS J124601.99-094309.3 and the counterpart (Aryan et al., GCN 36094). \n\nSDSS J124601.99-094309.3 shows strong emission lines from hydrogen and oxygen with a common redshift of z = 0.41, somewhat higher than the photometric redshift. The trace from the transient, which has a lower S/N, is featureless in our preliminary reduction, and as such we cannot place strong constraints on its association with SDSS J124601.99-094309.3. The offset of the source at z = 0.41 corresponds to approximately 25 kpc in projection, which would be a large offset for a core-collapse event, although we note that the H-alpha line is extended to within ~1â of the transient location. If associated with a supernova similar to 1998bw at z = 0.41, we would expect a peak at around R ~ 22.5 mag approximately 3 weeks from now. \n\nWe thank the GTC staff for the rapid execution of these observations. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36110.",
"published": "2024-04-15T09:48:02.474269Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T09:48:02.474287Z",
"modified": "2024-04-15T09:48:02.482395Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6581,
"topic": "gcn.circular",
"uuid": "1804b799-6686-46ae-bf17-3d6a25d36cdd",
"title": "GRB 240414A: AKO Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "24/04/15 10:28:18 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36111"
},
"title": "GCN CIRCULAR",
"number": "36111",
"subject": "GRB 240414A: AKO Optical Upper Limit"
},
"message_text": "Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International\nAstronomical Center in Abu Dhabi, UAE), Nidhal Guessoum and Dalya Akl\n(American University of Sharjah, UAE), report:\n\nAs a follow-up for the GRB 240414A (Caputo et al., GCN 36083), where the\noptical afterglow was detected by (Schneider et al., GCN 36084; Adami et\nal., GCN 36085; de Ugarte Postigo et. al., GCN 36087; Dutton et al., GCN\n36097; Turpin et. al., GCN 36101).\n\nWe observed the field of this GRB using our 0.36m f/7.7 robotic telescope.\nOur observation started on 14 April 2024 at 21:00:26 UT, 18.7 hours after\nthe GRB trigger. No new optical source was detected within the error box\n(Osborne et al., GCN 36102) down to 19.9 magnitude in the stacked image\n(total 20x180s, Ic band). The magnitude was estimated using the Atlas\ncatalogue as a reference, and it is not corrected for galactic extinction.\n\nOur non-detection is consistent with the results of (Niwano et al., GCN\n36088; Peretto et al., GCN 36100; Karambelkar et al., GCN 36103).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36111.",
"published": "2024-04-15T10:28:34.517632Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-15T10:28:34.517651Z",
"modified": "2024-04-15T10:28:34.526583Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5929,
"topic": "gcn.circular",
"uuid": "e7410505-119a-49da-840b-ab9e84da716a",
"title": "GRB 240125A: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/01/27 00:35:22 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35639"
},
"title": "GCN CIRCULAR",
"number": "35639",
"subject": "GRB 240125A: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "P. S. Marrocchesi (U of Siena), A. Yoshida, T. Sakamoto,\nS. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),\nS. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike,\nK. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),\nN. Cannady (GSFC/UMBC), M. L. Cherry (LSU),\nS. Ricciarini (U of Florence),\nand the CALET collaboration:\n\nThe short GRB 240125A (Glowbug gamma-ray detection:\nCheung et al., GCN Circ. 35630; AstroSat CZTI detection:\nJoshi et al., GCN Circ. 35637) triggered the CALET Gamma-ray\nBurst Monitor (CGBM) at 09:34:58.79 UTC on 25 January 2024\n(http://cgbm.calet.jp/cgbm_trigger/flight/1390210300/).\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows a triple-peaked structure that\nstarts at T+0.50 sec, peaks at T+1.02 sec, and ends at T+1.65 sec.\nThe T90 and T50 durations measured by the SGM data are\n1.10 +/- 0.05 sec and 0.65 +/- 0.11 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1390210300/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35639.",
"published": "2024-01-27T00:35:38.271114Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T00:35:38.271135Z",
"modified": "2024-01-27T00:35:38.279013Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5930,
"topic": "gcn.circular",
"uuid": "4cff91d5-886d-4f2f-a17f-0870da45697d",
"title": "IceCube-240123A: 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": "24/01/27 02:26:57 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35640"
},
"title": "GCN CIRCULAR",
"number": "35640",
"subject": "IceCube-240123A: 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-240123A (https://gcn.nasa.gov/circulars/35604) in a time range of 1000 seconds centered on the alert event time (2024-01-23 11:17:16.050 UTC to 2024-01-23 11:33:56.050 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-240123A. 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-240123A is 1.4e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 3e+02 GeV and 1e+05 GeV.\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2024-01-22 11:25:36.050 UTC to 2024-01-24 11:25:36.050 UTC). In this case, we report a p-value of 0.08, 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-240123A is 1.6e-01 GeV cm^-2 in a 2 day time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can 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/35640.",
"published": "2024-01-27T02:27:07.862611Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T02:27:07.862624Z",
"modified": "2024-01-27T02:27:07.870435Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5935,
"topic": "gcn.circular",
"uuid": "3e041fea-5085-4a8d-87eb-aacd5d577248",
"title": "GRB 240125A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/28 17:29:33 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35645"
},
"title": "GCN CIRCULAR",
"number": "35645",
"subject": "GRB 240125A: 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 short-duration GRB 240125A (Glowbug detection: GCN 35630; AstroSat detection: GCN 35637; CALET/CGBM detection: GCN 35639; Konus/Wind trigger at 2024-01-25 09:35:03.601 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe subthreshold detection was confirmed at the peak time 2024-01-25 09:35:00 UTC. The T90 duration measured by GRBAlpha is 1 s and the overall significance during T90 reaches 4.4 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240125A_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/35645.",
"published": "2024-01-28T17:29:48.135228Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-28T17:29:48.135249Z",
"modified": "2024-01-28T17:29:48.145719Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5944,
"topic": "gcn.circular",
"uuid": "bef57764-bada-48be-9e0f-d5516aa0d8bc",
"title": "IPN triangulation of GRB 240125B (short)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/01/30 19:43:07 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35654"
},
"title": "GCN CIRCULAR",
"number": "35654",
"subject": "IPN triangulation of GRB 240125B (short)"
},
"message_text": "D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,\non behalf of the IPN,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM team,\n\nand\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\nreport:\n\nThe short-duration GRB 240125B\n(Fermi-GBM detection: The Fermi GBM team, GCN 35634)\nwas detected by Fermi (GBM trigger 727908527), and\nINTEGRAL (SPI-ACS) at about 74923 s UT (20:48:43).\n\nWe have triangulated it to a GBM-SPI-ACS annulus centered at\nRA(2000)\u00132.059 deg (08h 48m 14s) Dec(2000)=+85.090 deg (+85d 05' 24\")\nwhose radius is 34.188 +/- 6.337 deg (3 sigma).\n\nThe annulus combined with the Fermi-GBM final position (GCN 35634;\nglg_healpix_all_bn240125867_v00) and the Fermi Earth-occultation information gives 575 sq. deg (3 sigma) localization region.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240125_T74922/IPN/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35654.",
"published": "2024-01-30T19:43:22.439719Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-30T19:43:22.439733Z",
"modified": "2024-01-30T19:43:22.447782Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5931,
"topic": "gcn.circular",
"uuid": "341742d4-f157-4ed6-af34-fd1d886d650d",
"title": "GRB 240127A: 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": "24/01/27 05:01:10 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35641"
},
"title": "GCN CIRCULAR",
"number": "35641",
"subject": "GRB 240127A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 04:50:40 UT on 27 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240127A (trigger 728023845.52457 / 240127202).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 299.9, Dec = -62.8 (J2000 degrees, equivalent to J2000 19h 59m, -62d 47'), with a statistical uncertainty of 29.9 degrees.\n\nThe angle from the Fermi LAT boresight is 129.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240127202/quicklook/glg_skymap_all_bn240127202.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/bn240127202/quicklook/glg_healpix_all_bn240127202.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240127202/quicklook/glg_lc_medres34_bn240127202.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35641.",
"published": "2024-01-27T05:01:25.601905Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T05:01:25.601918Z",
"modified": "2024-01-27T05:01:25.610205Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5932,
"topic": "gcn.circular",
"uuid": "475e9e83-689d-4c8d-beaf-9b64dd3f1d58",
"title": "GRB 240122A: ATCA detection of radio counterpart",
"submitter": "Hop gcn.circular",
"authors": "Gemma Anderson at Curtin U <gemma.anderson@curtin.edu.au>",
"data": {
"date": "24/01/27 06:27:28 GMT",
"from": "Gemma Anderson at Curtin U <gemma.anderson@curtin.edu.au>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35642"
},
"title": "GCN CIRCULAR",
"number": "35642",
"subject": "GRB 240122A: ATCA detection of radio counterpart"
},
"message_text": "G. E. Anderson (Curtin), A. Gulati (USyd), L. Rhodes (Oxford), J. K. Leung (UofT/HUJI), A. J. van der Horst (GWU), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration\n\nThe Australia Telescope Compact Array (ATCA) observed the MAXI-detected long GRB 240122A (Negoro et al., GCN 35593) at the GOTO (Kumar et al., GCN 35596) and Swift-XRT localisation (Ambrosi et al., GCN 35600) as part of the Large ATCA \"PanRadio GRB\" follow-up program C3542 (PI. Anderson).\n\nThe observation took place on 2024-01-24 at 12:00 UT for 2.5 hours at 5.5 and 9 GHz. We detected a candidate radio afterglow at 9 GHz consistent with the GOTO and XRT position with a preliminary flux density of ~160 microJy with a RMS sensitivity of 20 microJy, and obtained a 3 sigma upper limit of 135 microJy at 5.5 GHz.\n\nFurther observations are planned.\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/35642.",
"published": "2024-01-27T06:27:44.243760Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T06:27:44.243774Z",
"modified": "2024-01-27T06:27:44.250511Z",
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{
"id": 5933,
"topic": "gcn.circular",
"uuid": "4108d3f9-8f38-4407-aed5-f1acca1bf3fe",
"title": "GRB 240123C: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/01/27 16:19:42 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35643"
},
"title": "GCN CIRCULAR",
"number": "35643",
"subject": "GRB 240123C: 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 short-duration GRB 240123C (AstroSat detection: GCN 35635; INTEGRAL/SPI-ACS peak detection at 2024-01-23 ~23:12:37) 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 2024-01-23 23:12:37 UTC. The T90 duration measured by GRBAlpha is 2 s and the overall significance during T90 reaches 12 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240123C_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/35643.",
"published": "2024-01-27T16:19:56.089709Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T16:19:56.089722Z",
"modified": "2024-01-27T16:19:56.098015Z",
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},
{
"id": 5934,
"topic": "gcn.circular",
"uuid": "b578a746-083b-431a-aa10-d14c6860206e",
"title": "Fermi GRB 240127A: 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": "24/01/27 19:31:24 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35644"
},
"title": "GCN CIRCULAR",
"number": "35644",
"subject": "Fermi GRB 240127A: 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 240127A ( Fermi GBM team, GCN 35641) errorbox 50416 sec after notice time and 50449 sec after trigger time at 2024-01-27 18:51:29 UT, with upper limit up to 18.4 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -13.5 deg.\n\nThe galactic latitude b = -32 deg., longitude l = 334 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#65466\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 50479 | 2024-01-27 18:51:29 | MASTER-SAAO | (21h 13m 34.50s , -48d 04m 39.1s) | C | 60 | 17.2 |\n 50479 | 2024-01-27 18:51:29 | MASTER-SAAO | (21h 16m 12.91s , -48d 17m 24.0s) | C | 60 | 17.8 |\n 50559 | 2024-01-27 18:52:49 | MASTER-SAAO | (21h 16m 07.54s , -49d 59m 45.4s) | C | 60 | 17.3 |\n 50559 | 2024-01-27 18:52:49 | MASTER-SAAO | (21h 18m 52.23s , -50d 12m 29.7s) | C | 60 | 17.8 |\n 50719 | 2024-01-27 18:55:29 | MASTER-SAAO | (21h 07m 19.93s , -55d 42m 11.5s) | C | 60 | 17.8 |\n 50719 | 2024-01-27 18:55:29 | MASTER-SAAO | (21h 10m 27.84s , -55d 54m 56.1s) | C | 60 | 18.3 |\n 50878 | 2024-01-27 18:58:08 | MASTER-SAAO | (21h 20m 12.47s , -51d 53m 49.9s) | C | 60 | 17.8 |\n 50878 | 2024-01-27 18:58:08 | MASTER-SAAO | (21h 23m 04.13s , -52d 06m 33.9s) | C | 60 | 18.4 |\n 50957 | 2024-01-27 18:59:27 | MASTER-SAAO | (19h 58m 01.24s , -59d 27m 21.3s) | C | 60 | 17.2 |\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/35644.",
"published": "2024-01-27T19:31:35.507773Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-01-27T19:31:35.507790Z",
"modified": "2024-01-27T19:31:35.516503Z",
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]
}
