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"count": 257459,
"next": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=1400&ordering=topic",
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"results": [
{
"id": 4693,
"topic": "gcn.circular",
"uuid": "86917a7e-6976-41d3-9df0-8f8bc867d79d",
"title": "GRB 231115A: Swift ToO observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/15 18:06:33 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35040"
},
"title": "GCN CIRCULAR",
"number": "35040",
"subject": "GRB 231115A: 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 INTEGRAL GRB 231115A.\nAutomated analysis of the XRT data will be presented online at\nhttps://www.swift.ac.uk/ToO_GRBs/00021625\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 INTEGRAL 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/35040.",
"published": "2023-11-15T18:06:44.562665Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T18:06:44.562686Z",
"modified": "2023-11-15T18:06:44.571143Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4694,
"topic": "gcn.circular",
"uuid": "d110a1be-5a3a-49f6-895b-ae511b393c46",
"title": "GRB 231115A: GROWTH-India discovery of a potential optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"data": {
"date": "23/11/15 18:30:14 GMT",
"from": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35041"
},
"title": "GCN CIRCULAR",
"number": "35041",
"subject": "GRB 231115A: GROWTH-India discovery of a potential optical counterpart"
},
"message_text": "R. Kumar, A. Salgundi, V. Swain, Y. Wagh, V. Bhalerao (IIT Bombay), G. C. Anupama, S. Barway (IIA), R. Norboo (IAO), T. Ahumada, V. Karambelkar, M. M. Kasliwal (Caltech) report on behalf of a larger collaboration\n\nWe observed the field of GRB 231115A (Fermi GBM Team, GCN 35035) with 0.7m GROWTH India telescope. We started observations at 2023-11-15 16:47:58.140 UT, 1.19 hours after the fermi trigger (as soon as the source became visible). We obtained multiple 300s exposures in multiple filters. We have multiple detections of a transient AT 2023xvj at RA = 09:56:00.2, Dec = 69:40:29.2, with r' = 19.2. Owing to the dense background, current total astrometric uncertainty is about 0.6\". The source is 0.3' from the reported Integral position, consistent with their 2' uncertainty. The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\n\nAt this stage, we cannot rule out that this might be Nova or some other transient in M82. Further imaging and analysis is under way. We strongly encourage follow-up observations.\n\nThe GROWTH India Telescope (GIT, Kumar et al., 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35041.",
"published": "2023-11-15T18:30:26.045551Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T18:30:26.045575Z",
"modified": "2023-11-15T18:30:26.057655Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4695,
"topic": "gcn.circular",
"uuid": "bd3fa1bf-8372-411f-aaa9-a6a0a00907cd",
"title": "Integral GRB231115.65: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/15 18:57:30 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35042"
},
"title": "GCN CIRCULAR",
"number": "35042",
"subject": "Integral GRB231115.65: 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 Integral GRB231115.65 (trigger No 10427,09h 56m 07.98s , +69d 41m 21.3s, R=0.0511667) errorbox 4607 sec after notice time and 4634 sec after trigger time at 2023-11-15 16:53:37 UT, with upper limit up to 20.0 mag. The observations began at zenith distance = 47 deg. The sun altitude is -57.5 deg.\n\nThe galactic latitude b = 41 deg., longitude l = 141 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#06494\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 4725 | MASTER-Tunka | C | 180 | 18.8 |\n 5241 | MASTER-Tunka | C | 90 | 17.9 |\n 5473 | MASTER-Tunka | C | 90 | 17.6 |\n 5708 | MASTER-Tunka | C | 90 | 17.6 |\n 10669 | MASTER-Tunka | C | 180 | 19.2 |\n 10829 | MASTER-Tunka | C | 90 | 18.8 |\n 11178 | MASTER-Tunka | C | 90 | 19.2 |\n 11409 | MASTER-Tunka | C | 90 | 19.4 |\n 11524 | MASTER-Tunka | C | 90 | 19.5 |\n 11638 | MASTER-Tunka | C | 90 | 19.6 |\n 11724 | MASTER-Tunka | C | 30 | 19.8 |\n 11840 | MASTER-Tunka | C | 30 | 20.0 |\n 11898 | MASTER-Tunka | C | 30 | 20.0 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35042.",
"published": "2023-11-15T18:57:42.751069Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T18:57:42.751103Z",
"modified": "2023-11-15T18:57:42.760338Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4700,
"topic": "gcn.circular",
"uuid": "7cd6e12b-9d56-4c90-8c8f-038c3caf91cc",
"title": "GRB 231106A: TESS identification of candidate optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Rahul Jayaraman at MIT <rjayaram@mit.edu>",
"data": {
"date": "23/11/15 22:20:46 GMT",
"from": "Rahul Jayaraman at MIT <rjayaram@mit.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35047"
},
"title": "GCN CIRCULAR",
"number": "35047",
"subject": "GRB 231106A: TESS identification of candidate optical counterpart"
},
"message_text": "R. Jayaraman (MIT/MKI), R. Vanderspek (MIT/MKI), M.M. Fausnaugh (TTU), G. Mo (MIT/LIGO), and G.R. Ricker (MIT/MKI) report:\n\nThe Transiting Exoplanet Survey Satellite (TESS; Ricker et al. JATIS 1 2015) was observing 91% of the Fermi-GBM localization region for the gamma-ray burst GRB 231106A (GCN 34956). TESS observed this region at a 200 second cadence continuously from 1.5 days before the trigger to 6.4 days after the trigger. The GRB occurred during TESS observational Sector 71, and most of the GBM localization fell within Camera 4, CCD 1.\n\nWe inspected the full-frame image (FFI) from the publicly available TICA data archived at MAST (https://archive.stsci.edu/hlsp/tica) at the time of the Fermi trigger and identified a bright point source not present in previous TESS images. This point source is located at RA = 113.4482, Dec = 29.2245 (uncertainty 1-2\"), which is 3.6° from the center of the Fermi-GBM error region, and is located within the 39.7% credible region of the Fermi sky map. We extracted a light curve for this source from the calibrated TESS FFIs produced by TICA (Fausnaugh et al. RNAAS 2020) using difference imaging and forced photometry. Our analysis procedure is described in Fausnaugh et al. 2023 (ApJ 956(2):108).\n\nTESS observations show that this optical transient rises rapidly (in less than 200 seconds), peaks at a magnitude of 13.8 in the TESS band (600 nmâ1000 nm), and then decays to the detection limit within 2000 seconds, with a power-law index of -0.95 ± 0.28. The 3-sigma detection limit around the time of the trigger was 17.5.\n\nThis circular includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5â26555.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35047.",
"published": "2023-11-15T22:20:56.542355Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T22:20:56.542377Z",
"modified": "2023-11-15T22:20:56.556270Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4701,
"topic": "gcn.circular",
"uuid": "6402bea5-aaf4-4d10-8787-84bb13411203",
"title": "GRB 231115A: pre-burst ZTF upper limits for GRB optical counterpart candidate ",
"submitter": "Hop gcn.circular",
"authors": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"data": {
"date": "23/11/15 22:21:51 GMT",
"from": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35048"
},
"title": "GCN CIRCULAR",
"number": "35048",
"subject": "GRB 231115A: pre-burst ZTF upper limits for GRB optical counterpart candidate "
},
"message_text": "Tomas Ahumada (CIT), Jacob Wise (LJMU), Michael Coughlin (UMN), on behalf of the ZTF and GROWTH collaboration: \n\nWe serendipitously observed the localization region of GRB 231115A (GCN 35035) as part of routine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al., 2019) survey operations. We most recently obtained images in the g-, and r-bands beginning ~1.2 days before the trigger time. We report recent upper limits for the GRB optical counterpart candidate AT 2023xvj/GIT231115aa (GCN 35041) in the table below: \n\nFilter | mjd | mag lim (AB mag)\n----------------------\nr | 60262.4944329 | 20.47\ng | 60262.4463542 | 20.37\n\nAdditionally, we ran forced photometry on ZTF images (Masci et al. 2019) at the location of the transient, and found no previous activity at the 4 sigma level since the beginning of the ZTF survey (March 2018).\n\nWe note the latest ATLAS (Tonry et al. 2018, Smith et al. 2020) observations of the field were 7 days prior to the burst, reaching a limit of 19.2 mag in the r-band.\n\n\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). GROWTH India telescope is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). GROWTH-India project is supported by SERB and administered by IUSSTF, under grant number IUSSTF/PIRE Program/GROWTH/2015-16 and IUCAA. Fritz and SkyPortal acknowledge the generous support of The Gordon and Betty Moore Foundation, through the Data-Driven Investigator Program.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35048.",
"published": "2023-11-15T22:21:58.633457Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T22:21:58.633477Z",
"modified": "2023-11-15T22:21:58.639805Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4702,
"topic": "gcn.circular",
"uuid": "b89c6cdc-27e8-4216-a506-0296220d2e31",
"title": "GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA",
"submitter": "Hop gcn.circular",
"authors": "brina.martinez@ligo.org",
"data": {
"date": "23/11/15 22:24:45 GMT",
"from": "brina.martinez@ligo.org",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35049"
},
"title": "GCN CIRCULAR",
"number": "35049",
"subject": "GRB 231115A: Non-detection in low-latency of gravitational waves with LIGO/Virgo/KAGRA"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nAt the time of GRB 231115A, the LIGO Hanford Observatory (H1) was observing with a binary neutron star (BNS) merger average sensitive range of ~150 Mpc. The low-latency pipelines for compact binary mergers [1-4] were operational at the time of the GRB. No gravitational-wave candidates were found in a window of [-5, +1] seconds around GRB 231115A [5]. We find that H1 was sensitive to gravitational waves from both Fermi (GCN 35035) and INTEGRAL (GCN 35036, 35037) sky positions. An offline analysis will be performed to search for extremely weak gravitational-wave signals and determine exclusion limits.\n\n[1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n[2] Aubin et al. CQG 38, 095004 (2021)\n[3] Dal Canton et al. ApJ 923, 254 (2021)\n[4] Chu et al. PRD 105, 024023 (2022)\n[5] Urban, A. L. 2016, Ph.D. Thesis https://dc.uwm.edu/etd/1218 and Piotrzkowski, B. J. 2022, Ph.D. Thesis https://dc.uwm.edu/etd/3060\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35049.",
"published": "2023-11-15T22:24:53.029931Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T22:24:53.029951Z",
"modified": "2023-11-15T22:24:53.036380Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4696,
"topic": "gcn.circular",
"uuid": "f20d7a45-d604-4951-ad14-77f8e02a781c",
"title": "GRB 231115A: archival HST observations",
"submitter": "Hop gcn.circular",
"authors": "Andrew Levan at Radboud University <a.levan@astro.ru.nl>",
"data": {
"date": "23/11/15 20:01:14 GMT",
"from": "Andrew Levan at Radboud University <a.levan@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35043"
},
"title": "GCN CIRCULAR",
"number": "35043",
"subject": "GRB 231115A: archival HST observations"
},
"message_text": "A.J. Levan (Radboud), B. Gompertz (Birmingham), D.B. Malesani (DAWN/NBI) report:\n\nThe field of GRB 231115A (Mereghetti et al. GCN 35037) has been previously observed on several occasions by the Hubble Space Telescope via targeted observations of M82. Visual inspection of the location of the suggested candidate identified by Kumar et al. (GCN 35041) indicates that the environment is unremarkable. In blue observations obtained in F435W (GO 10776, 29-03-2006), the source lies on the stellar field of the host galaxy, but no readily identifiable discrete sources can be seen (e.g. massive stars or star-forming regions). In the IR, the field resolves into a larger number of discrete sources, likely due to the smaller extinction. Several sources are present within the 0.6â error region in F110W observations (GO 11360, 01-01-2010) with magnitudes around F110W=22 (AB). However, the density of such sources at this location in the galaxy is such that none is an outstanding candidate to be physically associated with the optical transient identified by Kumar et al.\n\nWe note that this location is relatively remote from the bulk of M82 and is not obviously associated with substantial star-forming activity. Although not unprecedented, this would be a somewhat unusual location for a magnetar giant flare.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35043.",
"published": "2023-11-15T20:01:24.697663Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T20:01:24.697683Z",
"modified": "2023-11-15T20:01:24.706234Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4697,
"topic": "gcn.circular",
"uuid": "79da521f-a425-4f65-bb3d-3ce8924e9734",
"title": "GRB 231115A: Fermi Observations of a probable Magnetar Giant Flare from M82",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/11/15 20:50:45 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35044"
},
"title": "GCN CIRCULAR",
"number": "35044",
"subject": "GRB 231115A: Fermi Observations of a probable Magnetar Giant Flare from M82"
},
"message_text": "S. Dalessi (UAH), O.J. Roberts (USRA/NASA-MSFC), P. Veres (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 15:36:21.20 UT on 15 November 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 231115A (trigger 721755386/231115650).\nwhich was also detected by Integral (P. D'Avanzo et al. 2023, GCN 35036 and S.Mereghetti et al. 2023, GCN 35037).\nThe Fermi GBM Final Real-time Localization is reported in GCN 35035 and is consistent with the Integral position.\n\nThe angle from the Fermi LAT boresight is 38 degrees.\n\nThe GBM light curve single peak with a duration (T90)\nof about 0.03 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.02 to T0+0.02 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is 0.5 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 580 +/- 60 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.3 +/- 0.4)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.0 s in the 10-1000 keV band is 11 +/- 1 ph/s/cm^2.\n\nUsing the distance to M82 of 3.5 Mpc (P. D'Avanzo et al. 2023, GCN 35036), we derive an Eiso of 1.4e45 ergs and Liso of 1.9e46 erg s-1 (64 ms, 1-10,000 keV). This with the rise time of ~2 ms, hard spectral slope and soft-hard-soft spectral evolution of the event, are consistent with an MGF origin.\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/35044.",
"published": "2023-11-15T20:50:56.605940Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T20:50:56.605961Z",
"modified": "2023-11-15T20:50:56.613863Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4698,
"topic": "gcn.circular",
"uuid": "803fcc34-6446-4c74-86ee-e876d5e065e1",
"title": "GRB 231115A (short): Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "23/11/15 21:36:10 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35045"
},
"title": "GCN CIRCULAR",
"number": "35045",
"subject": "GRB 231115A (short): Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: \n\nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 231115A, which was also detected by Fermi/GBM and IBAS, and found to be positionally consistent with M82 (GCN 35035, 35036, 35037, 35038, 35044).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-11-15 15:36:20.184 with a duration of 0.064 s and a total significance of about 23.3 sigma. The light curve comprises a single peak.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.0 and a cutoff energy (\"Epeak\") of 561 keV. The modeled 10-10000 keV fluence is 4e-07 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/35045.",
"published": "2023-11-15T21:36:21.149211Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T21:36:21.149235Z",
"modified": "2023-11-15T21:36:21.158486Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4699,
"topic": "gcn.circular",
"uuid": "8d883f99-724a-403c-a414-dc4ea064f6d3",
"title": "GRB 231115A: MASTER optical observations",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/15 21:39:48 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35046"
},
"title": "GCN CIRCULAR",
"number": "35046",
"subject": "GRB 231115A: MASTER optical observations"
},
"message_text": "P.Balanutsa (Lomonosov MSU), N.Budnev, O.Gress (ISU,API),A.Sankovich\nV. Lipunov, E. Gorbovskoy, N. Tiurina,\nD.Vlasenko, Yu.Tselik, Ya.Kechin, A.Kuznetsov, K.Zhirkov,\nA.Chasovnikov, I.Gorbunov, D.Zimnukhov, V.Senik, V.Topolev, D.Cheryasov,\nA.Sosnovskij, V.Senik (Lomonosov Moscow State University, SAI, Physics\nDepartment),\nR. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),\nD. Buckley (South African Astronomical Observatory),\nR. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico\nFelixAguilar OAFA),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational State University)\n\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 GRB 231115A (Fermi GBM Team GCN 35035, Mereghetti et al., GCN 35037) errorbox 4607 sec after notice time and 4634 sec after trigger time at 2023-11-15 16:53:37 UT, with upper limit up to 21.3 mag.\n\nOur first images (till T0+10669) are ruined due to bad weather conditions.\nSinces T0+10669, during the observations the weather improved. The list of limits up to 21.3 is presented in the table below. In pictures with the maximum limit we do not see the source. In all our frames, the object GAIA 1070550388423847680 with a magnitude of 19.44, closest to the indicated area in (Kumar et al GCN 35041), is clearly visible.\nThe localization region of OT (Kumar et al GCN 35041) has a diffuse structure, but we definitely do not see a source there with a brightness of 19.5 or brighterat given position.\nDespite the presence of images with deeper upper limits, due to the diffuse structure of the galaxy in the localization region,\nit is difficult to talk about weaker sources in the preliminary analysis.\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 4725 | MASTER-Tunka | C | 180 | 18.8 |\n 5241 | MASTER-Tunka | C | 90 | 17.9 |\n 5473 | MASTER-Tunka | C | 90 | 17.6 |\n 5708 | MASTER-Tunka | C | 90 | 17.6 |\n 10669 | MASTER-Tunka | C | 180 | 19.2 |\n 10829 | MASTER-Tunka | C | 90 | 18.8 |\n 11178 | MASTER-Tunka | C | 90 | 19.2 |\n 11409 | MASTER-Tunka | C | 90 | 19.4 |\n 11524 | MASTER-Tunka | C | 90 | 19.5 |\n 11638 | MASTER-Tunka | C | 90 | 19.6 |\n 11724 | MASTER-Tunka | C | 30 | 19.8 |\n 11840 | MASTER-Tunka | C | 30 | 20.0 |\n 11885 | MASTER-Tunka | C | 120 | 20.7 | Coadd\n 12230 | MASTER-Tunka | C | 810 | 21.1 | Coadd\n 11898 | MASTER-Tunka | C | 30 | 20.0 |\n 11968 | MASTER-Tunka | C | 60 | 14.5 |\n 11968 | MASTER-Tunka | C | 60 | 20.2 |\n 12056 | MASTER-Tunka | C | 60 | 20.4 |\n 12146 | MASTER-Tunka | C | 240 | 20.4 | Coadd\n 12158 | MASTER-Tunka | C | 90 | 19.9 |\n 12273 | MASTER-Tunka | C | 90 | 19.9 |\n 12399 | MASTER-Tunka | C | 90 | 20.0 |\n 12489 | MASTER-Tunka | C | 270 | 20.4 | Coadd\n 12514 | MASTER-Tunka | C | 90 | 20.0 |\n 12630 | MASTER-Tunka | C | 90 | 20.0 |\n 12848 | MASTER-Tunka | C | 90 | 19.9 |\n 13045 | MASTER-Tunka | C | 60 | 20.5 |\n 13105 | MASTER-Tunka | C | 180 | 21.1 | Coadd\n 13285 | MASTER-Tunka | C | 540 | 21.0 | Coadd\n 13132 | MASTER-Tunka | C | 60 | 20.5 |\n 13218 | MASTER-Tunka | C | 60 | 20.5 |\n 13306 | MASTER-Tunka | C | 60 | 20.5 |\n 13366 | MASTER-Tunka | C | 180 | 21.0 | Coadd\n 13391 | MASTER-Tunka | C | 60 | 20.5 |\n 13478 | MASTER-Tunka | C | 60 | 20.5 |\n 13564 | MASTER-Tunka | C | 60 | 20.5 |\n 13624 | MASTER-Tunka | C | 180 | 21.1 | Coadd\n 13648 | MASTER-Tunka | C | 60 | 14.9 |\n 13648 | MASTER-Tunka | C | 60 | 20.5 |\n 13733 | MASTER-Tunka | C | 60 | 20.5 |\n 13820 | MASTER-Tunka | C | 60 | 15.2 |\n 13821 | MASTER-Tunka | C | 60 | 20.5 |\n 13881 | MASTER-Tunka | C | 180 | 21.0 | Coadd\n 13907 | MASTER-Tunka | C | 60 | 20.5 |\n 13993 | MASTER-Tunka | C | 60 | 20.5 |\n 14095 | MASTER-Tunka | C | 90 | 19.9 |\n 14201 | MASTER-Tunka | C | 60 | 20.5 |\n 14261 | MASTER-Tunka | C | 180 | 21.2 | Coadd\n 14288 | MASTER-Tunka | C | 60 | 20.5 |\n 14377 | MASTER-Tunka | C | 60 | 20.5 |\n 14463 | MASTER-Tunka | C | 60 | 15.6 |\n 14463 | MASTER-Tunka | C | 60 | 20.5 |\n 14523 | MASTER-Tunka | C | 180 | 21.1 | Coadd\n 14548 | MASTER-Tunka | C | 60 | 20.5 |\n 14633 | MASTER-Tunka | C | 60 | 20.5 |\n 14717 | MASTER-Tunka | C | 60 | 15.5 |\n 14718 | MASTER-Tunka | C | 60 | 20.5 |\n 14778 | MASTER-Tunka | C | 180 | 21.2 | Coadd\n 14805 | MASTER-Tunka | C | 60 | 20.6 |\n 14885 | MASTER-Tunka | C | 60 | 20.6 |\n 14973 | MASTER-Tunka | C | 60 | 20.6 |\n 15033 | MASTER-Tunka | C | 180 | 21.3 | Coadd\n 15060 | MASTER-Tunka | C | 60 | 15.4 |\n 15061 | MASTER-Tunka | C | 60 | 20.6 |\n 15147 | MASTER-Tunka | C | 60 | 20.6 |\n 15233 | MASTER-Tunka | C | 60 | 15.6 |\n 15233 | MASTER-Tunka | C | 60 | 20.5 |\n 15293 | MASTER-Tunka | C | 180 | 21.1 | Coadd\n 15381 | MASTER-Tunka | C | 180 | 20.6 |\n 15533 | MASTER-Tunka | C | 60 | 20.5 |\n 15620 | MASTER-Tunka | C | 60 | 20.5 |\n 15705 | MASTER-Tunka | C | 60 | 20.3 |\n 15765 | MASTER-Tunka | C | 180 | 20.8 | Coadd\n 15796 | MASTER-Tunka | C | 60 | 20.3 |\n 15885 | MASTER-Tunka | C | 60 | 20.4 |\n 15966 | MASTER-Tunka | C | 60 | 20.4 |\n 16051 | MASTER-Tunka | C | 60 | 14.6 |\n 16051 | MASTER-Tunka | C | 60 | 20.3 |\nFilter C is a clear (unfiltred) band.\n\nReal time updated cover map and actual upper limits list available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#06494\n\nThe observations began at zenith distance = 47 deg. The sun altitude is -57.5 deg. The galactic latitude b = 41 deg., longitude l = 141 deg.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35046.",
"published": "2023-11-15T21:39:56.537147Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T21:39:56.537167Z",
"modified": "2023-11-15T21:39:56.552799Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4704,
"topic": "gcn.circular",
"uuid": "d1de4600-58fc-4fb3-a54b-478462069602",
"title": "GRB231115A: GRANDMA Observations",
"submitter": "Hop gcn.circular",
"authors": "Cristina Andrade at UMN <andra104@umn.edu>",
"data": {
"date": "23/11/15 23:22:01 GMT",
"from": "Cristina Andrade at UMN <andra104@umn.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35051"
},
"title": "GCN CIRCULAR",
"number": "35051",
"subject": "GRB231115A: GRANDMA Observations"
},
"message_text": "A. Iskandar (XAO), F. Wang (THU/BJP), J. Zhu (BJP), L. Wang, X. Zeng, C. Andrade (UMN), A. de Ugarte Postigo (CNRS/OCA), D. Akl (AUS), E. Broens (KNC), S. Antier (OCA-Artemis), I. Tosta e Melo (UniCT-DFA), P. Hello (IJCLAB), D. Turpin (CEA-Saclay/Irfu), T. Pradier (Unistra/IPHC), M. Coughlin (UMN), S. Karpov (FZU), J. Peloton (IJCLab) report on behalf of the GRANDMA collaboration:\n\nWe observed the field of GRB 231115A (Fermi GBM team, GCN 35035) covering the complete INTEGRAL error box (DâAvanzo et al. GCN 35036;Mereghetti et al. GCN 35037) within the GRANDMA collaboration. Imaging with the 0.4m SNOVA telescope did not find any candidate in r-band around 2023-11-15 17:37:53 (e.g 2h after the trigger time) down to an upper limit of 18.9 (5-sigma threshold) or 19.3 (3-sigma threshold) using PS1 catalog as photometric comparison. We also looked carefully at the location of AT 2023xvj (Kumar et al. GCN 35041).\n\nThe amateur contribution to GRANDMA, Kilonova Catcher (KNC), made no detection with a 30x180s image using a clear filter on 2023-11-15T20:00 UTC (TGRB + 3.28h). We determine a detection limit of 20 mag in r-band, using PS1 for calibration and color term correction. At 2023-11-15T18:53:25.219, we obtained R>18 from 5x180s exposure. The upper limit is given at 5-sigma averaged over all the images.\n\nThese upper limits are consistent with previous reports by MASTER (Lipunov et al. GCN 35046).\n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35051.",
"published": "2023-11-15T23:22:12.662964Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-15T23:22:12.662990Z",
"modified": "2023-11-15T23:22:12.671514Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4705,
"topic": "gcn.circular",
"uuid": "40675f55-3908-4057-b5f0-597285a46a78",
"title": "GRB 231115A: Kinder observations with Lulin observatory",
"submitter": "Hop gcn.circular",
"authors": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"data": {
"date": "23/11/16 00:01:49 GMT",
"from": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35052"
},
"title": "GCN CIRCULAR",
"number": "35052",
"subject": "GRB 231115A: Kinder observations with Lulin observatory"
},
"message_text": "T.-W. Chen, C.-S. Lin (both NCUIA), A.J. Levan (Radboud), S. Schulze (CIERA, NW), M. Fraser (UCD), P. D'Avanzo (INAF - OAB), J. Lyman (Warwick), Y.-C. Cheng, C.-H. Wang (both NTNU), S. Yang (HNAS), M.-H. Lee, Y.-C. Pan, C.-C. Ngeow, H.-Y. Hsiao, W.-J. Hou, J.-K. Guo (all NCUIA), M. Fulton, S. Srivastav, T. Moore, C. Angus, A. Aamer (all QUB) and S. Smartt (Oxford/QUB) report:\n\nWe observed the field of GRB 231115A, a short GRB discovered by the Fermi GBM (Fermi GBM Team, GCN 35035). The GRB position is consistent with M 82 galaxy (DâAvanzo et al., GCN 35036). This burst is also detected by IBAS (Mereghetti et al., GCN 35037), INTEGRAL (Burns, GCN 35038) and Glowbug on the ISS (Cheung et al., GCN 35045). The GROWTH-India discovery of a potential optical counterpart AT 2023xvj with r~19.2 (Kumar et al., GCN 35041), taken on 1.19 hours after the Fermi trigger.\n\nWe used the 40cm SLT at Lulin Observatory, Taiwan to obtain r, i and z-band images of the field of M82, as part of the Kinder collaboration (Chen et al., AstroNote 2021-92).\nThe first SLT epoch of observations started at 16:46 UT on 15 of November 2023 (MJD = 60263.699), 1.15 hours after the Fermi GBM trigger. The images were combined from 7 frames with a 300-second exposure time for the r band, taken under seeing conditions of an average of 1.6\" and at a median airmass of 2.14. We then took i-band images for 15 frames started at 18:56 UT, each with 300-second exposure time, taken under seeing conditions of an average of 2.2\" and at a median airmass of 1.58. Finally, starting at 20:10 UT we observed z-band images for 13 frames, each with 300-second exposure time, taken under seeing conditions of an average of 2.0\" and at a median airmass of 1.49.\n\nWe used the Kinder pipeline (Yang et al. A&A 646, A22) to measure the 3-sigma limits on the source location. We obtained the following preliminary magnitudes (in the AB system):\n\nr > 19.23 mag,\ni > 19.48 mag and,\nz > 18.53 mag.\n\nThe given limit is derived based on calibrating against Pan-STARRS1 field stars and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.14 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\nWe do not see the source AT 2023xvj in the combined r, i and z-band images, nor in a subtraction against images obtained from the Legacy survey. However, the relatively poor conditions combined with high underlying surface brightness from the galaxy substantially reduce our sensitivity, and we would at best have marginally detected the transient identified by Kumar et al. (GCN 35041).\n\n\n\n\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35052.",
"published": "2023-11-16T00:02:00.690328Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T00:02:00.690347Z",
"modified": "2023-11-16T00:02:00.699469Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4711,
"topic": "gcn.circular",
"uuid": "78c050b3-1139-4e83-93da-290bdf4337d7",
"title": "GRB 231116A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/11/16 09:51:03 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35058"
},
"title": "GCN CIRCULAR",
"number": "35058",
"subject": "GRB 231116A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 09:40:34 UT on 16 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231116A (trigger 721820439.761364 / 231116403).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 24.6, Dec = -36.8 (J2000 degrees, equivalent to J2000 01h 38m, -36d 47'), with a statistical uncertainty of 11.2 degrees.\n\nThe angle from the Fermi LAT boresight is 23.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231116403/quicklook/glg_skymap_all_bn231116403.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231116403/quicklook/glg_healpix_all_bn231116403.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231116403/quicklook/glg_lc_medres34_bn231116403.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35058.",
"published": "2023-11-16T09:51:13.643936Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T09:51:13.643957Z",
"modified": "2023-11-16T09:51:13.651016Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4706,
"topic": "gcn.circular",
"uuid": "eb01dbd0-b90f-4160-802f-b62a5fe53b10",
"title": "GRB 231115A: Upper limits from a neutrino search with IceCube",
"submitter": "Hop gcn.circular",
"authors": "Sam Hori at IceCube/U Wisc-Madison <sahori@wisc.edu>",
"data": {
"date": "23/11/16 02:50:50 GMT",
"from": "Sam Hori at IceCube/U Wisc-Madison <sahori@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35053"
},
"title": "GCN CIRCULAR",
"number": "35053",
"subject": "GRB 231115A: Upper limits from a neutrino search with IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\n\n\nIceCube has performed a search for track-like muon neutrino events arriving from the direction of GRB 231115A (GCN Circ. 35035<https://gcn.nasa.gov/circulars/35035> (Fermi-GBM), INTEGRAL GCN Notice 10427<https://gcn.gsfc.nasa.gov/other/10427.integral>), a likely magnetar giant flare in M82 (D'Avanzo et al., GCN Circ. 35036<https://gcn.nasa.gov/circulars/35036>; Mereghetti et al., GCN Circ 35037<https://gcn.nasa.gov/circulars/35037>; Burns, GCN Circ 35038<https://gcn.nasa.gov/circulars/35038>).\n\n\nWe searched a time window off +/- 2000 seconds from the initial trigger reported by INTEGRAL (23/11/15 15:36:22.88 UT), during which IceCube was collecting good quality data. We used the offline direction reported by INTEGRAL (INTEGRAL GCN Notice 10427<https://gcn.gsfc.nasa.gov/other/10427.integral>). Zero track-like events are found in coincidence with the position of the GRB. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 7.6*10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power-law spectrum. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 500 GeV and 130 TeV.\n\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu<mailto:roc@icecube.wisc.edu>.\n\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35053.",
"published": "2023-11-16T02:51:01.524823Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T02:51:01.524843Z",
"modified": "2023-11-16T02:51:01.531575Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4707,
"topic": "gcn.circular",
"uuid": "bc958b57-31e3-4a36-81d2-fa2b8db370a2",
"title": "GRB 231115A: archival Chandra X-ray observations",
"submitter": "Hop gcn.circular",
"authors": "Albert Kong at NTHU <akhkong@gmail.com>",
"data": {
"date": "23/11/16 05:14:29 GMT",
"from": "Albert Kong at NTHU <akhkong@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35054"
},
"title": "GCN CIRCULAR",
"number": "35054",
"subject": "GRB 231115A: archival Chandra X-ray observations"
},
"message_text": "A.K.H. Kong (NTHU), K.-L. Li (NCKU) report:\n\nFollowing the discovery of GRB 231115A (GCN 35035) in the direction of M82 and its optical counterpart candidate AT 2023xvj (GCN 35041), we searched for X-ray emission from the progenitor with the Chandra X-ray Observatory. Chandra observed M82 with the ACIS detector 32 times between 2000 and 2016, with a total exposure time of about 561 ks. We combined all the observations and no source is visible at the position of the optical transient. We derive a 3-sigma luminosity limit of 2.3e37 erg/s (0.3-10 keV; D=3.5 Mpc) by assuming an absorbed power-law model with a photon index of 2.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35054.",
"published": "2023-11-16T05:14:39.363617Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T05:14:39.363642Z",
"modified": "2023-11-16T05:14:39.372614Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4708,
"topic": "gcn.circular",
"uuid": "06c494c9-2fe6-4425-9d10-2f4a646c02c0",
"title": "GRB 231115A / AT2023xvj: Updated GIT analysis",
"submitter": "Hop gcn.circular",
"authors": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"data": {
"date": "23/11/16 06:07:34 GMT",
"from": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35055"
},
"title": "GCN CIRCULAR",
"number": "35055",
"subject": "GRB 231115A / AT2023xvj: Updated GIT analysis"
},
"message_text": "R. Kumar (IIT Bombay), V. Karambelkar (Caltech), V. Swain, V. Bhalerao, A. Salgundi, Y. Wagh (IIT Bombay), G. C. Anupama, S. Barway (IIA), R. Norboo (IAO), T. Ahumada, M. M. Kasliwal (Caltech) report on behalf of a larger collaboration\n\nWe undertook refined analysis of GIT231115AA / AT2023xvj (Kumar et al, GCN 35041). The source is detected in 25 individual r-band images obtained by GIT (https://sites.google.com/view/growthindia/results/at2023xvj) as well as in a stacked image.\n\nWe investigated the reference images from PanSTARRS used for image subtraction and find a small, fuzzy, \"negative\" artifact at the location of the source (see link above), which may boost the counts at the source location. This had been considered in the original report, and excluded due to three reasons: first, the measured source flux is varying despite fixed exposure times, which makes it unlikely that they are all caused due to the same artifact. Second, there are similar artifacts at other locations in the reference images which do not create such bright spurious sources. Third, the source shows a PSF-like profile while the reference image artifact does not.\n\nOther groups have reported non-detections which are broadly consistent with our detection: Balanutsa et al, (GCN 35046) report an upper limit of 21.3 which is comparable to our image sensitivity of 21.45 (5-sigma). However, the candidate is in a high background region which will result in shallower upper limits. Upper limits reported by Iskandar et al (GCN 35051 - 18.9 mag), and Chen et al (GCN 35052 - 19.2 mag) are consistent with our measurement.\n\nGiven the complex nature of background in the M82 field and the potential artifact, we undertook manual image subtraction using SDSS images as a reference. In this scenario, the subtraction is noisier, and we do not detect any source at the location of GIT231115AA / AT2023xvj, to a limiting magnitude of 19.3 (5-sigma).\n\nGiven this analysis, we caution observers that AT2023xvj be treated as a candidate, not a secure counterpart.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35055.",
"published": "2023-11-16T06:07:44.915673Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T06:07:44.915695Z",
"modified": "2023-11-16T06:07:44.924238Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4745,
"topic": "gcn.circular",
"uuid": "f07300bb-f7c4-450c-9bc2-69ca4ac126a9",
"title": "GRB 231117A: AKO Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/11/17 16:43:21 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35084"
},
"title": "GCN CIRCULAR",
"number": "35084",
"subject": "GRB 231117A: AKO Optical Upper Limit"
},
"message_text": "M. Odeh (Al-Khatim Observatory, AKO, operated by the International\nAstronomical Center in Abu Dhabi, UAE) and N. Guessoum and D. Akl (American\nUniversity of Sharjah, UAE) report:\n\n\nWe observed the field of GRB 231117A, which was detected by Swift/BAT,\nAstroSat/CZTI, AGILE, and Konus/Wind (GCN 35071, 35072, 35075, 35079) with\nour 0.36m f/7.7 robotic telescope on November 17 starting at: 14:46:29 UT\n(corresponding to 11.72 hours from the GRB trigger time) using an (Ic)\nfilter. We obtained 33x180 second images.\n\n\nWe do not detect a source within the Swift-XRT error region around the\ncandidate X-ray source (Laha et al., GCN 35071). The following 5-sigma\nupper limit is calculated using the ATLAS catalog as a reference:\n\nIc = 20.2.\n\nWe should note, however, that a star of Imag = 21.5 (AB) was barely\ndetected and is located at the position R.A. (2000) = 22 09 33.34, Dec.\n(2000) = +13 31 19.44, that is about 2 arcseconds from the location of GRB\n231117A, as per Pan-STARRS (PS1, ID = 124223323889577032).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35084.",
"published": "2023-11-17T16:43:33.991159Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T16:43:33.991186Z",
"modified": "2023-11-17T16:43:34.003646Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4751,
"topic": "gcn.circular",
"uuid": "2b1fd728-528b-4a78-be74-2e203972daa1",
"title": "GRB 231117A: REM optical and NIR early-time observations",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"data": {
"date": "23/11/17 18:20:43 GMT",
"from": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35086"
},
"title": "GCN CIRCULAR",
"number": "35086",
"subject": "GRB 231117A: REM optical and NIR early-time observations"
},
"message_text": "M.Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 231117A (Laha et al., GCN 35071) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2023 November 17 at 03:04:27 UT (i.e. 68 seconds after the burst) at airmass ~ 3, and lasting for about 2 hours.\n\nFrom a preliminary analysis, we find no source at the enhanced XRT position (Beardmore et al., GCN 35074) at a mid time of t-t0 = 5.6 min, down to the following 3sigma magnitude upper limits:\n\nr > 18.6\ni > 17.9\nz > 16.7\n(AB; calibrated against the Pan-STARRS catalogue).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35086.",
"published": "2023-11-17T18:20:53.326262Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T18:20:53.326282Z",
"modified": "2023-11-17T18:20:53.335133Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4709,
"topic": "gcn.circular",
"uuid": "ac1cf705-e974-4639-9627-f647c7e7b498",
"title": "GRB 231115A: Gaoyazi/GOT follow-up and archival observations",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/11/16 06:31:54 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35056"
},
"title": "GCN CIRCULAR",
"number": "35056",
"subject": "GRB 231115A: Gaoyazi/GOT follow-up and archival observations"
},
"message_text": "S.Q. Jiang, X. Liu, S.Y. Fu, J. An, Z.P. Zhu, T.H. Lu, D. Xu (NAOC), L.F. Huo, S.W. Luo, M.M. Yang, Z. K. Feng (GYZO) report:\n\nWe observed the field of GRB 231115A, a short GRB detected by the Fermi GBM (Fermi GBM Team, GCN 35035), INTEGRAL (Mereghetti et al., GCN 35037), and Glowbug (Cheung et al., GCN 35045), using the GOT-0.5m telescope located at Gaoyazi, Xinjiang, China. Observations started at 16:36:59 UT on 2023-11-15, i.e., 1.01 hr after the Fermi/GBM trigger, and we obtained 40x60 s frames in the Sloan r-filter and 40x90 s frames in the Sloan z-filter.\n\nNo credible optical transient is detected in our stacked images within and beside the error region of the INTEGRAL by the means of catalogue cross-match and image subtraction, down to 3-sigma limiting magnitudes of r>20.1 @ 1.38 hr and z>18.0 @ 2.86 hr post-burst, calibrated with nearby PanSTARRS stars. The magnitude is not corrected for Galactic extinction.\n\nThe field is also covered by the GW survey program at the GOT. The latest template was taken on 2023-10-05 and it gives upper limit down to r>18.8 within the INTEGRAL/IBAS error region.\n\n\n\n\n\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35056.",
"published": "2023-11-16T06:32:05.363122Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T06:32:05.363143Z",
"modified": "2023-11-16T06:32:05.376041Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4710,
"topic": "gcn.circular",
"uuid": "2bd971bb-afe2-474e-99bf-8f9383129e66",
"title": "GRB 231115A : MITSuME Akeno and Okayama optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "hayatsu@hp.phys.titech.ac.jp",
"data": {
"date": "23/11/16 08:39:17 GMT",
"from": "hayatsu@hp.phys.titech.ac.jp",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35057"
},
"title": "GCN CIRCULAR",
"number": "35057",
"subject": "GRB 231115A : MITSuME Akeno and Okayama optical upper limits"
},
"message_text": "S. Hayatsu, N. Higuchi, I. Takahashi, M. Sasada (Tokyo Tech), K. L. Murata (Kyoto U),\nM. Niwano, S. Sato, H. Seki, H. Takei, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe observed a field of GRB 231115A ( Fermi GBM Team GCN Circular #35035) with optical three-color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescopes Akeno and Okayama.\n\nThe observation started at 2023-11-15 17:17:29 UT (6068 seconds after the Fermi/GBM trigger). We stacked the images with good conditions. We did not detect any obvious point sources at the position reported by Kumar et al. GCN Circular #35041. We obtained the 5-sigma limits of the stacked images as follows.\n\nT0+[sec] | MID-UT | T-EXP[sec] | 5-sigma limits\n------------------------------------------------------------------------------------------------\n# MITSuME Akeno\n6482 | 2023-11-15 17:24:23 | 600.0 | g'>19.6, Rc>19.5, Ic>19.0\n7527 | 2023-11-15 17:41:48 | 1200.0 | g'>20.0, Rc>19.8, Ic>19.3\n9612 | 2023-11-15 18:16:33 | 2400.0 | g'>20.4, Rc>20.2, Ic>19.7\n# MITSuME Okayama\n12526 | 2023-11-15 19:05:07 | 7380.0 | g'>19.1, Rc>19.9, Ic>19.2\n------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\n\nWe used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35057.",
"published": "2023-11-16T08:39:27.770050Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T08:39:27.770076Z",
"modified": "2023-11-16T08:39:27.779137Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4712,
"topic": "gcn.circular",
"uuid": "92a10e02-8fa2-4ea3-abd2-3b0e46088787",
"title": "GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/11/16 09:52:35 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35059"
},
"title": "GCN CIRCULAR",
"number": "35059",
"subject": "GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar"
},
"message_text": "P. Minaev (IKI), A. Pozanenko (IKI) report on behalf of GRB IKI FuN:\n\nWe analyzed GRB 231115A, detected till now by GBM/Fermi (GCN 35035, GCN 35044) and INTEGRAL (GCN 35037), Glowbug (GCN 35045), using publicly available data of GBM/Fermi. The light curve of the burst is FRED-like with duration of T_90 = 0.06 +/- 0.01 s in (7, 850) keV energy range. The spectral analysis in a time interval of (-0.05, 0.05) s since GBM trigger, the best fit is obtained for CPL model with following parameters: E_p = 613 (- 60, +74) keV, alpha = 0.33 +/- 0.21. The fluence of F = (7.2 +/- 0.5)E-7 erg/cm**2 is obtained in 10 - 1000 keV energy band, Eiso = (1.24 +/- 0.14)E45 erg in (1, 10000) keV energy range for D_L = 3.5 Mpc of M82. Using Ep,i â Eiso correlation and T_90,i - EH diagram [1,2] we classify the burst as the SGR giant flare. Taking into account the non-detection of gravitational waves with LIGO/Virgo/KAGRA (LIGO Scientific Collaboration, Virgo Collaboration, KAGRA Collaboration, GCN 35049) we can suggest the GRB 231115A as the giant flash of a new SG!\n R in M82 galaxy.\n\nEp,i â Eiso correlation can be found at http://grb.rssi.ru/GRB231115A/GRB231115A_Ep-Eiso.png\n\nT_90,i - EH diagram can be found at http://grb.rssi.ru/GRB231115A/GRB231115A_EHD.png\n\n[1] - Minaev et al., MNRAS, 492, 1919, 2020 \n[2] - Minaev et al., Astronomy Letters, 46, 9, 573, 2020\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35059.",
"published": "2023-11-16T09:52:41.765389Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T09:52:41.765422Z",
"modified": "2023-11-16T09:52:41.772906Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4713,
"topic": "gcn.circular",
"uuid": "c4628bfb-d70a-4dbe-8a6e-c6eb57e85b3b",
"title": "GRB 231115A: Insight-HXMT/HE detection",
"submitter": "Hop gcn.circular",
"authors": "Kai Kai <wcxuemail@gmail.com>",
"data": {
"date": "23/11/16 11:03:52 GMT",
"from": "Kai Kai <wcxuemail@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35060"
},
"title": "GCN CIRCULAR",
"number": "35060",
"subject": "GRB 231115A: Insight-HXMT/HE detection"
},
"message_text": "W. C. Xue, S. L. Xiong, X. B. Li and C. K. Li\nreport on behalf of the Insight-HXMT team:\n\nAt 2023-11-15T15:36:21.200 (T0), Insight-HXMT/HE detected\nGRB 231115A (trigger ID: HEB231115650) in a routine search of the data,\nwhich was also observed by Fermi/GBM (Fermi GBM Team, GCN 35035 & 35044),\nINTEGRAL (P. D'Avanzo et al., GCN 35036, S. Mereghetti et al. GCN 35037)\nand Glowbug (C. C. Cheung et al., GCN 35045). This burst is probably a\ngiant flare from a magnetar in the nearby galaxy M82.\n\nThe Insight-HXMT/HE light curve mainly consists of single\npulse with a duration (T90) of 0.08 s measured from T0-0.01 s.\nThe 1-ms peak rate, measured from T0-0.01 s, is 16611 cnts/sec.\nThe total counts from this burst is 210 counts.\nURL_LC: https://twikinew.ihep.ac.cn/pubhxmt/HXMT/GRBList/HEB231115650_lc.jpg\n\nAll measurements above are made with the CsI detectors operating in the\nregular mode with the energy range of about 80-800 keV (deposited energy).\nOnly gamma-rays with energy greater than about 200 keV can penetrate\nthe spacecraft and leave signals in the CsI detectors installed inside\nthe telescope.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was\nfunded jointly by the China National Space Administration (CNSA) and\nthe Chinese Academy of Sciences (CAS).\nMore information about it could be found at:\nhttp://www.hxmt.org.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35060.",
"published": "2023-11-16T11:04:04.612172Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T11:04:04.612198Z",
"modified": "2023-11-16T11:04:04.620458Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4752,
"topic": "gcn.circular",
"uuid": "0581c068-6367-450e-888e-04d10f58a423",
"title": "GRB 231117A: Keck observations indicate presence of optical afterglow in z~0.3-0.5 galaxy",
"submitter": "Hop gcn.circular",
"authors": "Jillian Rastinejad at Northwestern Univ. <jillianrastinejad2024@u.northwestern.edu>",
"data": {
"date": "23/11/17 21:56:10 GMT",
"from": "Jillian Rastinejad at Northwestern Univ. <jillianrastinejad2024@u.northwestern.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35087"
},
"title": "GCN CIRCULAR",
"number": "35087",
"subject": "GRB 231117A: Keck observations indicate presence of optical afterglow in z~0.3-0.5 galaxy"
},
"message_text": "J. C. Rastinejad, W. Fong, H. Sears (Northwestern), R. Chornock, W. Jacobson-Galan (UC Berkeley), C. D. Kilpatrick (Northwestern), R. Margutti (UC Berkeley), G. Schroeder (Northwestern) et al. report:\n\n''We observed the location of the bright short-duration GRB 231117A (Laha et al., GCN 35071, Navaneeth et al., GCN 35072, Cattaneo et al., GCN 35075, Svinkin et al., GCN 35079, Cheung et al., GCN 35081) with the Low Resolution Imaging Spectrometer (LRIS) mounted on the Keck I 10-meter telescope on Mauna Kea, Hawaii (PI Margutti). We obtain 6x150s of imaging in the g- and I-bands starting at 2023 Nov 17.096 UT (2.3 hr post-burst) at an airmass of 1.02 in 0.8'' seeing and thin clouds.\n\nWe detect the archival source (SDSS J220933.34+133119.5, photo-z = 0.34-0.48) first noted by Yang et al. (GCN 35083). This source is on the outskirts of the latest XRT position (Beardmore et al., GCN 35074). Calibrated to Pan-STARRS, we measure g = 20.3 +/- 0.1 mag and I = 19.8 +/- 0.1 mag (AB system and not corrected for Galactic extinction). These magnitudes are ~1.3.-1.5 mag brighter than the Pan-STARRS catalog magnitudes for this source across both filters. Although visual inspection does not indicate a clear physical separation between an afterglow and the center of the host, we attribute the clear brightening in flux to the optical afterglow, supporting the afterglow candidate discovered by Yang et al., and an origin for this short GRB at z~0.3-0.5.\n\nPerforming differential photometry relative to the Pan-STARRS catalog magnitudes results in an afterglow brightness of g~20.7 mag and I~20.1 mag at the time of our Keck observations. At z=0.4, this translates to an optical luminosity of ~7e43 erg/s, consistent with optical afterglow luminosities at similar rest-frame times. Taken at face value, our observations also indicate a slow decline rate (Fopt ~ t^-0.2 - t^-0.3) compared to the Lulin Observatory observations at 7.5 hr, although we caution that our preliminary analysis is only based on differential photometry and not image subtraction.\n\nWe encourage follow-up to determine the sourceâs redshift and confirm the fading of the optical afterglow candidate.\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35087.",
"published": "2023-11-17T21:56:21.207658Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T21:56:21.207678Z",
"modified": "2023-11-17T21:56:21.216740Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4753,
"topic": "gcn.circular",
"uuid": "645a5e20-f300-4e8e-9019-86619c51c7b5",
"title": "GRB 231117A: LT observations consistent with fading",
"submitter": "Hop gcn.circular",
"authors": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"data": {
"date": "23/11/17 22:43:55 GMT",
"from": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35088"
},
"title": "GCN CIRCULAR",
"number": "35088",
"subject": "GRB 231117A: LT observations consistent with fading"
},
"message_text": "B. P. Gompertz (U. Birmingham) and K. Ackley (U. Warwick) report:\n\nWe observed the field of the short GRB 231117A (Laha et al., GCN 35071; Navaneeth et al., GCN 35072; Cattaneo et al., GCN 35075; Svinkin et al., GCN 35079; Cheung et al., GCN 35081) with the IO:O camera on the 2m robotic Liverpool Telescope. Observations began at 19:18:59 UT on 2023-11-17, ~16.3 hours after trigger, and consisted of 20x120s exposures in each of the SDSS r and i filters.\n\nAt the position of the optical counterpart reported by Yang et al. (GCN 35083) we detect a source with preliminary AB magnitudes of:\n\ni = 20.10 +/- 0.03\nr = 20.24 +/- 0.02\n\nWhile these magnitudes include the contribution from the underlying galaxy, a comparison to the Keck observations taken ~14 hours prior (Rastinejad et al., GCN 35087) indicates fading at around the 3-sigma level. Combined with the significant excess above archival magnitudes, this supports the presence of the optical afterglow of GRB 231117A.\n\nAnalysis is ongoing. Reported magnitudes are not corrected for Galactic foreground extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35088.",
"published": "2023-11-17T22:44:06.151629Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T22:44:06.151648Z",
"modified": "2023-11-17T22:44:06.158701Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4714,
"topic": "gcn.circular",
"uuid": "030fa7b2-be42-4bb2-82bb-c4607207f0fb",
"title": "GRB 231115A: AGILE/MCAL upper limits",
"submitter": "Hop gcn.circular",
"authors": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"data": {
"date": "23/11/16 11:53:27 GMT",
"from": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35061"
},
"title": "GCN CIRCULAR",
"number": "35061",
"subject": "GRB 231115A: AGILE/MCAL upper limits"
},
"message_text": "C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS,\nand Univ. Roma Tor Vergata), C. Casentini, L. Foffano (INAF/IAPS),\nG. Piano (INAF/IAPS), A. Ursi (ASI and INAF/IAPS), L. Baroncelli,\nA. Bulgarelli, A. Ciabattoni, A. Di Piano, V. Fioretti, G. Panebianco,\nN. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari),\nP.W. Cattaneo (INFN Pavia), F. Cutrona (Univ. Milano Bicocca),\nF. Longo (Univ. Trieste, and INFN Trieste), report on behalf\nof the AGILE Team:\n\nAGILE observed the short GRB 231115A first reported by Fermi GBM at\nT0 = 15:36:21 UT on 15 Nov 2023 (GCN #35035) and significantly localized\nby INTEGRAL in M82 (GCN #35036, #35037, #35038), suggesting a possible\nmagnetar giant flare origin (also GCN #35044).\n\nThe GRB location was fully accessible to the AGILE MCAL at about 70\ndegrees off-axis, but no trigger occured around +/- 50 sec from T0.\n\nThe three-sigma upper limit (UL) obtained for a 1 s integration time\nat the GRB position is 1.3E-06 erg cm^-2 (assuming as spectral model a\nsingle power law with photon index 1.5).\n\n\nThe AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive\nin the energy range 0.4-100 MeV. Additional analysis of AGILE data\nis in progress.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35061.",
"published": "2023-11-16T11:53:38.709443Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T11:53:38.709464Z",
"modified": "2023-11-16T11:53:38.716645Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4715,
"topic": "gcn.circular",
"uuid": "705694cf-5ad2-400e-a6e3-a607fd315cbf",
"title": "Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/11/16 12:43:51 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35062"
},
"title": "GCN CIRCULAR",
"number": "35062",
"subject": "Konus-Wind detection of GRB 231115A (a probable Magnetar Giant Flare from M82)"
},
"message_text": "D. Frederiks, D. Svinkin, A.Lysenko, A. Ridnaia,\nYu. Temiraev, A. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe short duration, hard spectrum GRB 231115A\n(Fermi GBM detection: Fermi GBM team GCN 35035, Dalessi et al. GCN 35044;\nINTEGRAL (IBAS) detection: Mereghetti et al., GCN 35037;\nGlowbug detection: Cheung et al., GCN 35045)\ntriggered Konus-Wind (KW) at T0= 56183.509 s UT (15:36:23.509).\n\nThe burst light curve shows a single FRED-like pulse,\nwhich starts, at ~T0-0.028 s with the fast (<4 ms) rise of\nthe emission intensity, which peaks at ~T0-0.016 s\nand has a total duration of ~66 ms.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231115_T56183/\n\nAs observed by Konus-Wind, the burst had\na fluence of (7.3 ± 0.1)x10^-7 erg/cm^2 and\na 16-ms peak energy flux, measured from T0 - 0.018 s,\nof (2.2 ± 0.45)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0-0.028 s to T0+0.036 s)\nis best fit in the 20 keV - 1.5 MeV range by a power law with exponential\ncutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = 0.69(-0.54,+0.96) and Ep = 495(-77,+118) keV.\nA blackbody (BB) spectral model fits the spectrum equally well,\nwith the BB temperature kT = 114(-10,+9) keV.\n\nAssuming the likely GRB 231115A association with the nearby\nM82 galaxy at ~3.5 Mpc (DâAvanzo et al., GCN 35036;\nMereghetti et al., GCN 35037; Burns GCN 35038),\nwe estimate the burst isotropic energy Eiso to ~1.1x10^45 erg and\nthe 16-ms peak luminosity Liso to ~3.2x10^46 erg/s.\nThese values are in the range the of the energetics of initial pulses\nof magnetar giant flares (MGFs), which, assuming the short rise time\nand the hard energy spectrum of the burst, supports its MGF origin.\n\nAt 3.5 Mpc, the characteristic radius of the emission region,\nestimated from the KW blackbody spectral fit, is R~30 km,\nthe same order of magnitude as the radius of a neutron star or its magnetosphere.\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/35062.",
"published": "2023-11-16T12:44:01.239097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T12:44:01.239119Z",
"modified": "2023-11-16T12:44:01.245647Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4716,
"topic": "gcn.circular",
"uuid": "dfc02cba-0f8c-4b75-b263-37c7f0cd347c",
"title": "Fermi GRB 231116A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/16 14:31:28 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35063"
},
"title": "GCN CIRCULAR",
"number": "35063",
"subject": "Fermi GRB 231116A: 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 231116A ( Fermi GBM team, GCN 35058) errorbox 11646 sec after notice time and 11682 sec after trigger time at 2023-11-16 12:55:17 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 79 deg. The sun altitude is -33.8 deg.\n\nThe galactic latitude b = -76 deg., longitude l = 258 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#07066\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 11712 | 2023-11-16 12:55:17 | MASTER-Tunka | (01h 20m 09.29s , -24d 19m 42.3s) | C | 60 | 13.3 |\n 12543 | 2023-11-16 13:09:07 | MASTER-Tunka | (01h 37m 31.14s , -23d 35m 46.0s) | C | 60 | 13.5 |\n 14164 | 2023-11-16 13:36:08 | MASTER-Tunka | (01h 38m 09.70s , -26d 14m 15.0s) | C | 60 | 15.0 |\n 14164 | 2023-11-16 13:36:09 | MASTER-Tunka | (01h 39m 04.83s , -25d 30m 31.7s) | C | 60 | 17.5 |\n 15153 | 2023-11-16 13:52:38 | MASTER-Tunka | (01h 55m 51.97s , -25d 28m 37.9s) | C | 60 | 17.3 |\n 15595 | 2023-11-16 13:59:59 | MASTER-Tunka | (01h 23m 39.29s , -27d 21m 52.5s) | C | 60 | 17.4 |\n 16760 | 2023-11-16 14:19:24 | MASTER-Tunka | (01h 39m 44.73s , -28d 05m 13.6s) | C | 60 | 13.6 |\n 16760 | 2023-11-16 14:19:25 | MASTER-Tunka | (01h 40m 42.06s , -27d 21m 29.3s) | C | 60 | 16.2 |\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/35063.",
"published": "2023-11-16T14:31:41.814422Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T14:31:41.814441Z",
"modified": "2023-11-16T14:31:41.822229Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4717,
"topic": "gcn.circular",
"uuid": "fe56e00e-fe97-475f-a145-49a4e291d4fe",
"title": "GRB 231115A: Swift-XRT and Swift-UVOT observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/16 14:39:58 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35064"
},
"title": "GCN CIRCULAR",
"number": "35064",
"subject": "GRB 231115A: Swift-XRT and Swift-UVOT observations"
},
"message_text": "J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB), A. D'Ai\n(INAF-IASFPA), A. Melandri (INAF-OAR), J. D. Gropp (PSU), S. Dichiara\n(PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U.\nLeicester) and P.A. Evans (U. Leicester) and S. R. Oates (Lancaster U.)\nreport on behalf of the Swift-XRT and the Swift-UVOT teams:\n\nSwift-XRT has performed follow-up observations of the INTEGRAL-detected\nburst GRB 231115A, which is likely not a GRB, but it is likely a MGF\n(Burns GCN Circular 35038) and whose position is consistent with M82\ngalaxy (D'Avanzo et al. GCN Circ. 35036; Mereghetti et al. GCN Circ.\n35037), collecting 4.4 ks of Photon Counting (PC) mode data between\nT0+9.0 ks and T0+39.2 ks.\n\nNo uncatalogued X-ray sources have been detected consistent with being\nwithin 303 arcsec of the INTEGRAL position. The 3-sigma upper limit in\nthe field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a\n0.3-10 keV observed flux of 8.2e-14 to 1.2e-13 erg cm^-2 s^-1 (assuming\na typical GRB spectrum).\n\nSix previously-catalogued X-ray sources have been detected consistent\nwith being within 303 arcsec of the INTEGRAL position, however their\nstatus as catalogued objects makes them unlikely to be the X-ray\ncounterpart.\n\nAn uncatalogued object was detected, however this was too far from the\nGRB position to be the\tX-ray counterpart.\n\nWe note that the diffuse X-ray emission from the M82 galaxy affects a\nsignificant fraction of the INTEGRAL error circle. This likely reduces\nthe sensitivity for source detection.\n\nThe results of the XRT-team automatic analysis of the XRT observations,\nincluding a position specific upper limit calculator, are available at\nhttps://www.swift.ac.uk/ToO_GRBs/00021625.\n\nNo optical counterpart consistent with the INTEGRAL position\n(Mereghetti et al., GCN Circ. 35037) is detected in the initial UVOT\nexposures.\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are:\n\nFilter\t T_start(s) T_stop(s)\t Exp(s)\t Mag\n\nw1\t\t 9253\n 39224\t 4283\t>17.4\n\nThe magnitude in the table is not corrected for the Galactic extinction\n\ndue to the reddening of E(B-V) = 0.155 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nThis circular is an official product of the Swift team.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35064.",
"published": "2023-11-16T14:40:09.711522Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T14:40:09.711541Z",
"modified": "2023-11-16T14:40:09.718061Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4718,
"topic": "gcn.circular",
"uuid": "efff77fc-f4e4-4c7e-bd7d-02ed875990f6",
"title": "GRB 231115A: Swift/BAT-GUANO detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/11/16 17:46:12 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35065"
},
"title": "GCN CIRCULAR",
"number": "35065",
"subject": "GRB 231115A: Swift/BAT-GUANO detection of a short burst"
},
"message_text": "Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (PSU), Gayathri Raman (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU) report:\n\nSwift/BAT did not localize GRB 231115A onboard (T0: 2023-11-15T15:36:21.2 UTC, Fermi GCN 35035, Integral GCN 35037, Glowbug GCN 35045, Insight-HXMT/HE GCN 35060, Konus-Wind GCN 35062).\n\nThe Fermi and Integral notices, 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 20.26 in a 0.128 s analysis time bin, starting at T0.\n\nNNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 8.9.\nThe Integral localization, coincident with M82, is consistent with being outside the BAT coded FOV.\n\nThe very short duration and the large E_peak (best fit value from the spectral template of 720 keV) are consistent with the Magnetar Giant Flare scenario (GCN 35044, GCN 35059).\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/35065.",
"published": "2023-11-16T17:46:26.742893Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T17:46:26.742912Z",
"modified": "2023-11-16T17:46:26.752647Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6383,
"topic": "gcn.circular",
"uuid": "3f82c9fa-2892-49c5-be4e-d49ad49faaa0",
"title": "LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "24/04/06 14:54:45 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36041"
},
"title": "GCN CIRCULAR",
"number": "36041",
"subject": "LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation"
},
"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\nAssuming the spectrum and the observer-frame energetics of GRB 240402B\nmeasured by KW (GCN 36028); the redshift of the probable host galaxy\nz=0.047 (Xu et al., GCN 36016; Levan et al., GCN 36025; Xue at al., GCN 36034);\nand a standard cosmology with H_0 = 67.3 km/s/Mpc,\nOmega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014);\nwe estimate the burst isotropic energy release E_iso to (4.06 ± 0.27)x10^49 erg,\nthe isotropic peak luminosity L_iso to (2.85 ± 0.38)x10^49 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to (90 ± 5) keV.\n\nWith the obtained estimates, GRB 240402B is a low-luminosity outlier\nin both 'Amati' and 'Yonetoku' relations for the sample of >300 long KW GRBs\nwith known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021),\nsee http://www.ioffe.ru/LEA/GRBs/GRB240402_T31668/GRB240402B_rest_frame.pdf\n\nAll the quoted errors are estimated at the 90% confidence level.\nAll the presented results are preliminary.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36041.",
"published": "2024-04-06T14:55:07.051404Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-06T14:55:07.051424Z",
"modified": "2024-04-06T14:55:07.060528Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4719,
"topic": "gcn.circular",
"uuid": "7b52ce6e-36b7-48e2-9b6d-734640bcbf36",
"title": "GRB 231115A: NuSTAR Follow-Up Observations",
"submitter": "Hop gcn.circular",
"authors": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"data": {
"date": "23/11/16 18:55:44 GMT",
"from": "Brian Grefenstette at Caltech/NuSTAR <bwgref@srl.caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35066"
},
"title": "GCN CIRCULAR",
"number": "35066",
"subject": "GRB 231115A: NuSTAR Follow-Up Observations"
},
"message_text": "B. Grefenstette and M. Brightman (Caltech) for the NuSTAR Team\n\nNuSTAR performed follow-up observations of GRB 231115A / magnetar giant flare (Burns GCN Circular 35038) in the direction of M82 (D'Avanzo et al. GCN Circ. 35036; Mereghetti et al. GCN Circ. 35037). The NuSTAR observation was centered on the potential optical counterpart location from GROWTH India (Kumar et al. GCN Circ 35041, Kumar et al., GCN Circ 35055).\n\nNuSTAR began observing at 2023-11-15T22:21:09, only ~four hours after the ToO trigger was approved. We report on the first ~40-ks of data.\n\nM82 has a number of bright point sources as well as extended emission that is unresolved by the NuSTAR PSF (see, e.g., Brightman et al 2020 ApJ 889 71, DOI:10.3847/1538-4357/ab629a). The NuSTR observation does not reveal any significant point sources outside of the central ~1-arcmin region of M82. No significant emission from the location of optical transient AT2023xvj at RA = 09:56:00.2, Dec = 69:40:29.2 (RA\u00149.000,Dec=+69.675) is seen, though this overlaps with the wings of the NuSTAR PSF from the central emission from M82 as well as extended emission in the galaxy. These observations are on-going.\n\nThe NuSTAR SINGS pipeline did not trigger on the GRB 231115A transient. We performed an off-line analysis of the NuSTAR shield data and the count rates from the X-ray detectors and do not see the transient in either set of data. This is unsurprising, as the NuSTAR CsI shield data are only stored at 1-Hz and short signals such as from this GRB are difficult to identify. The source was ~80 degrees from the Earth horizon and ~35-deg from the instrument boresight, which may also have been an unfavorable geometry for detecting the source in the CdZnTe detectors.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35066.",
"published": "2023-11-16T18:55:55.367393Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T18:55:55.367468Z",
"modified": "2023-11-16T18:55:55.379569Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4720,
"topic": "gcn.circular",
"uuid": "11dff33f-a5b2-4581-a827-136e1bdd0a6f",
"title": "GRB231115A: Liverpool Telescope imaging",
"submitter": "Hop gcn.circular",
"authors": "Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>",
"data": {
"date": "23/11/16 22:13:56 GMT",
"from": "Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35067"
},
"title": "GCN CIRCULAR",
"number": "35067",
"subject": "GRB231115A: Liverpool Telescope imaging"
},
"message_text": "D. A. Perley (LJMU), K.-R. Hinds (LJMU), J. Wise (LJMU), V. Karambelkar (Caltech), T. F. Ahumada (Caltech), and M. M. Kasliwal, (Caltech) report:\n\nWe obtained optical imaging of M82, the potential host of GRB 231115A (Fermi GBM Team, GCN 35035; Mereghetti et al., GCN 35037), using the IO:O imager on the 2m Liverpool Telescope. Two exposures of 195s each were taken in the g, r, i, and z filters between 03:45 and 04:14 on 2023-11-16 (UT), approximately 0.5 days after the GRB. Conditions were generally good throughout.\n\nWe performed image subtraction of the g-band and z-band images using Pan-STARRS 1 survey images as a reference. The PS1 r-band and i-band images show artifacts at the location of the potential optical source AT2023xfj reported by Kumar et al. (GCN 35041) and were unsuitable (see also Kumar et al., GCN 35055), so references were taken from the Sloan Digital Sky Survey for these filters instead.\n\nWe do not detect a source at the location of AT2023xfj, to approximate limits (3-sigma) of g>21.9, r>21.6, i>21.7, z>21.0 mag (AB). There are no other candidate transients detected in the difference image consistent with the disk of M82, with the possible exception of a red source at RA\t:55:53.079, +69:40:23.28 (J2000). However, this source is also visible as a point source in the reference images, suggesting it may be a foreground variable. The effective limiting magnitude of the subtraction is significantly shallower in the innermost regions of M82 due to the variable background.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35067.",
"published": "2023-11-16T22:14:06.590470Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T22:14:06.590491Z",
"modified": "2023-11-16T22:14:06.600551Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6683,
"topic": "gcn.circular",
"uuid": "fb759362-ce0a-4206-a45f-f48724444537",
"title": "EP240417a: YAHPT Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>",
"data": {
"date": "24/04/19 11:17:05 GMT",
"from": "Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36178"
},
"title": "GCN CIRCULAR",
"number": "36178",
"subject": "EP240417a: YAHPT Optical Upper Limits"
},
"message_text": "Tian-Rui Sun, Jin-Jun Geng, Jian Chen, Yan-Long Hua and Lei Hu report on behalf of the YAHPT team:\n\nFollowing the detection of EP240417a by Einstein Probe (Hu et al., GCN 36161),\nwe use the Yaoan High Precision Telescope at Yaoan Astronomy Observation Station (Yunnan province, China) to search and follow up.\n\nWe observed the target position with 300s exposure in Rc-band starting from 2024-04-18T16:35:20.400 about.\nWe took 5 images with total exposure time of 1500 seconds from 16:35:20 to 16:55:30.\nWe did not detect any possible optical counterpart up to Rc = 20.7 within the 3-arcmin radius.\n\nWe used the USNO B1.0 catalog (R2mag) as the magnitude reference for calibration.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36178.",
"published": "2024-04-19T11:17:12.599497Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-19T11:17:12.599509Z",
"modified": "2024-04-19T11:17:12.605040Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4721,
"topic": "gcn.circular",
"uuid": "f32a451b-b85f-4e82-a88e-06e8d79492b9",
"title": "MAGIC observation of GRB 231115A, a possible magnetar giant flare",
"submitter": "Hop gcn.circular",
"authors": "dpaneque@mppmu.mpg.de",
"data": {
"date": "23/11/16 22:40:37 GMT",
"from": "dpaneque@mppmu.mpg.de",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35068"
},
"title": "GCN CIRCULAR",
"number": "35068",
"subject": "MAGIC observation of GRB 231115A, a possible magnetar giant flare"
},
"message_text": "The MAGIC telescopes observed GRB 231115A (RA:09:56:00.22, Dec:+69:40:48.00), a candidate Magnetar Giant Flare from M82 (GCN 35044) after the alert issued by INTEGRAL (GCN/INTEGRAL NOTICE 10427). The observations in the very-high-energy (VHE; >100 GeV) range were performed on the night of November 15th starting at ~T0+8h, for about 2 hours, at large zenith angles. The fast and preliminary analysis does not show any significant detection (<2 sigma) above 250 GeV. The preliminary integral flux upper limit (95% confidence level) at 300 GeV is 8e-12 cm-2 s-1.\n\nThe contact persons for the MAGIC collaboration are Alicia López-Oramas (alicia.lopez@iac.es) Alessandra Lamastra (alessandra.lamastra@inaf.it) and Giuseppe Silvestri (giuseppe.silvestri@studenti.unipd.it) MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Observatory Roque de Los Muchachos of the Instituto de AstrofÃÂsica de Canarias (IAC) on the Canary island of La Palma, Spain (https://magic.mpp.mpg.de).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35068.",
"published": "2023-11-16T22:40:48.295193Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-16T22:40:48.295214Z",
"modified": "2023-11-16T22:40:48.301631Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4722,
"topic": "gcn.circular",
"uuid": "5c072f26-05b6-4d2f-99a7-e49fdd1221b4",
"title": "GRB 231111A: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"data": {
"date": "23/11/17 00:10:52 GMT",
"from": "Sam LaPorte at PSU <sjl5346@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35069"
},
"title": "GCN CIRCULAR",
"number": "35069",
"subject": "GRB 231111A: Swift/UVOT Detection"
},
"message_text": "GRB 231111A: Swift/UVOT Detection\n\nS. J. LaPorte (PSU) and A. Melandri (INAF-OAR)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231111A\n165 s after the BAT trigger (Melandri et al., GCN Circ. 34981).\nA source consistent with the XRT position\n(Evans et al., GCN Circ. 34991)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n RA (J2000) = 19:20:45.25 = 290.18856 (deg.)\n Dec (J2000) = +52:26:10.5 = 52.43624 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nPreliminary detections using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nb 26598 27505 885 >20.41\nuvm2 34150 34575 418 >20.05\nu 180 418 234 16.52\nv 33541 34144 590 >19.85\nuvw1 38947 39736 776 >20.24\nuvw2 27512 85141 1176 >20.65\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.117 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35069.",
"published": "2023-11-17T00:11:03.798557Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T00:11:03.798594Z",
"modified": "2023-11-17T00:11:03.805296Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4723,
"topic": "gcn.circular",
"uuid": "477f48c5-8446-47f4-8e3c-16dd1d43bb5c",
"title": "GRB 231115A: Non-detection of radio emission with CHIME/FRB",
"submitter": "Hop gcn.circular",
"authors": "alice.curtin@mail.mcgill.ca",
"data": {
"date": "23/11/17 00:23:15 GMT",
"from": "alice.curtin@mail.mcgill.ca",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35070"
},
"title": "GCN CIRCULAR",
"number": "35070",
"subject": "GRB 231115A: Non-detection of radio emission with CHIME/FRB"
},
"message_text": "Alice P. Curtin (McGill University) for the CHIME/FRB Collaboration:\n\nAt 15:36:21 UTC on 15 November 2023, GRB 231115A was detected by Fermi/GBM (Fermi GBM Team, GCN 35035 & 35044), INTEGRAL (P. D'Avanzo et al., GCN 35036, S. Mereghetti et al., GCN 35037), Glowbug (C. C. Cheung et al., GCN 35045), and Insight-HXMT (Insight-HXMT team, GCN 35060). The position of GRB 231115A (RA\u00149.00, DECi.68 with an uncertainty of 2 arcmin) is consistent with that of the M82 galaxy (S. Mereghetti et al. GCN 35037). Additionally, the spectrotemporal properties of GRB 231115A suggest it is likely due to a magnetar giant flare (Fermi/GBM Team, GCN 35044, S. Ronchini et al., GCN 35065).\n\nAt the time of the high-energy (HE) emission, GRB 231115A was ~20 degrees from the meridian of the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project (CHIME/FRB). No radio emission was detected from the source at the time of the HE emission. In addition to searching for radio emission at the time of the Fermi/GBM trigger, we also searched within the CHIME/FRB database for bursts from this position within the last two years, yet did not find any definitive astrophysical associations.\n\nUsing a pipeline described in Curtin et al. (2023), we constrain the FRB-like radio emission from this source in the 400-800 MHz band to be <260 Jy or <720 Jy ms (assuming a 10 ms pulse width) at the time of the Fermi/GBM trigger. The HE fluence reported by Fermi/GBM in the 10-1000 keV range is (6.3 +/- 0.4)e-7 erg/cm^2 (Fermi/GBM Team, GCN 35044). This implies a radio-to-HE emission ratio of <4.5e-9 (unitless assuming a 400 MHz bandwidth). Additionally, using a luminosity distance of 3.5 Mpc to the M82 galaxy (P. D'Avanzo et al. 2023, GCN 35036), our derived radio flux limit corresponds to an upper limit on the radio luminosity of <3.8e30 erg s^-1 Hz^-1.\n\nWhile GRB 231115A was ~20 degrees from the meridian of CHIME/FRB at the time of the Fermi/GBM trigger, it transited directly overhead CHIME/FRB at 14:18:45 UTC on 15 November 2023. Thus, our best radio constraints for this source are ~80 minutes prior to the Fermi/GBM trigger. As no radio emission was similarly detected at this time, we constrain the radio flux at this time to be <0.5 Jy and the fluence to be <1.2 Jy ms assuming a burst width of 10 ms. This corresponds to a radio luminosity limit of <7.3e27 erg s^-1 Hz^-1 and a radio-to-HE fluence ratio of <7.6e-12 (unitless assuming a 400 MHz bandwidth).\n\nReferences\nCurtin, A.P., Tendulkar, S.P., Josephy, A., et al., 2023, ApJ, 954, 154. doi:10.3847/1538-4357/ace52f\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35070.",
"published": "2023-11-17T00:23:26.137212Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T00:23:26.137237Z",
"modified": "2023-11-17T00:23:26.144081Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4724,
"topic": "gcn.circular",
"uuid": "4b738931-15cd-419d-82fd-9422819a02f9",
"title": "GRB 231117A: Swift detection of a bright short burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/11/17 03:16:38 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35071"
},
"title": "GCN CIRCULAR",
"number": "35071",
"subject": "GRB 231117A: Swift detection of a bright short burst"
},
"message_text": "\nS. Laha (GSFC/UMBC), C. Gronwall (PSU), J.D. Gropp (PSU),\nN. J. Klingler (GSFC/UMBC/CRESSTII), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII), C. Salvaggio (INAF-OAB) and\nA. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 03:03:19 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231117A (trigger\u001197027). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 332.409, +13.514 which is\n RA(J2000) = 22h 09m 38s\n Dec(J2000) = +13d 30' 49\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a single bright\npeak structure with a duration of about 1.5 sec. The peak count rate\nwas ~80,000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 03:05:01.5 UT, 101.8 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 332.39146, 13.52328 which is equivalent\nto:\n RA(J2000) = 22h 09m 33.95s\n Dec(J2000) = +13d 31' 23.8\"\nwith an uncertainty of 4.3 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. We\ncannot determine whether the source is fading at the present time. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density.\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 105 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image processing\nFAILED because of no aspect solution. Results from the list of sources\ngenerated on-board are not available at this time. No correction has been made\nfor the expected extinction corresponding to E(B-V) of 0.071.\n\nBurst Advocate for this burst is S. Laha (sib.laha 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/35071.",
"published": "2023-11-17T03:16:48.891561Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T03:16:48.891582Z",
"modified": "2023-11-17T03:16:48.899581Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4764,
"topic": "gcn.circular",
"uuid": "90258924-611a-4d8c-9078-11ddd0b6db27",
"title": "LIGO/Virgo/KAGRA S231118d: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Yi-Ru Chen at NTHU <eunice298123@gmail.com>",
"data": {
"date": "23/11/18 01:53:07 GMT",
"from": "Yi-Ru Chen at NTHU <eunice298123@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35090"
},
"title": "GCN CIRCULAR",
"number": "35090",
"subject": "LIGO/Virgo/KAGRA S231118d: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231118d during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-11-18 00:56:26.845 UTC (GPS time: 1384304204.845). The candidate was found by the CWB [1], GstLAL [2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS231118d is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231118d\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 26 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 1063 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2352 +/- 681 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35090.",
"published": "2023-11-18T01:53:13.649196Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T01:53:13.649216Z",
"modified": "2023-11-18T01:53:13.655801Z",
"nonlocalizedevents": [
{
"event_id": "S231118d"
}
],
"targets": []
},
{
"id": 4727,
"topic": "gcn.circular",
"uuid": "67092d27-df41-4a76-88ab-f46e02e85296",
"title": "GRB 231117A: AstroSat CZTI detection of a bright short burst",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/11/17 07:09:52 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35072"
},
"title": "GCN CIRCULAR",
"number": "35072",
"subject": "GRB 231117A: AstroSat CZTI detection of a bright short burst"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright short duration GRB 231117A which was also detected by Swift-BAT (Laha et al., GCN Circ. 35071), and CALET (Trigger 1384225326).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-11-17 03:03:19.74 UTC. The measured peak count rate associated with the burst is 8467 (+1562, -767) counts/s above the background in the combined data of all quadrants, with a total of 1375 (+86, -77) counts. The local mean background count rate was 335 (+15, -38) counts/s. Using cumulative rates, we measure a T90 of 0.42 (+0.04, -0.06) 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 2023-11-17 03:03:18.82 UTC. The measured peak count rate associated with the burst is 1496 (+86, -96) counts/s above the background in the combined data of all quadrants, with a total of 1883 (+307, -334) counts. The local mean background count rate was 1497 (+6, -7) 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/35072.",
"published": "2023-11-17T07:10:03.125778Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T07:10:03.125799Z",
"modified": "2023-11-17T07:10:03.134435Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4732,
"topic": "gcn.circular",
"uuid": "17dd1175-8a25-4ef1-a584-ff5033540b3b",
"title": "GRB 231117A: AGILE detection of a bright short burst",
"submitter": "Hop gcn.circular",
"authors": "Paolo Walter Cattaneo at INFN Pavia <paolo.cattaneo@pv.infn.it>",
"data": {
"date": "23/11/17 11:45:06 GMT",
"from": "Paolo Walter Cattaneo at INFN Pavia <paolo.cattaneo@pv.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35075"
},
"title": "GCN CIRCULAR",
"number": "35075",
"subject": "GRB 231117A: AGILE detection of a bright short burst"
},
"message_text": "P.W. Cattaneo (INFN Pavia), F. Verrecchia (SSDC, and INAF/OAR), \nF. Longo (Univ. Trieste, and INFN Trieste), C. Pittori (SSDC, and INAF/OAR), \nC. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),\nA. Argan, M. Cardillo, Y. Evangelista, L. Foffano, G. Piano (INAF/IAPS),\nA. Addis, L. Baroncelli, A. Bulgarelli, A. Ciabattoni, A. Di Piano, V. Fioretti \n(INAF/OAS-Bologna), G. Panebianco (Univ. Bologna - INAF/OAS Bologna), \nN. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli (SSDC, and INAF/OAR),\nM. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois\n(INAF/OA-Cagliari), A. Ursi (ASI and INAF/IAPS), I. Donnarumma, E. Menegoni \n(ASI), A. Giuliani (INAF/IASF-Mi), F. Cutrona (Univ. Milano Bicocca) and P. \nTempesta (TeleSpazio) report on behalf of the AGILE Team:\n\nThe AGILE satellite detected the short GRB 231117A at T0 = 2023-11-17\n03:03:20.50 (UT) , reported by Swift (GCN #35071) and AstroSat (GCN #35072).\n\nA preliminary analysis of the AGILE minicalorimeter (MCAL) triggered data\nfound a burst at T_mcal = 2023-11-17 03:03:20 +/- 0.01 s (UTC).\n\nThe event lasted about 0.16 s and released a total number of 222 counts\nin the detector (in the 0.4-100 MeV energy range), above an average\nbackground rate of 364 counts/s.\n\nThe light curve can be found at:\nhttp://www.agilescienceapp.it/notices/086277-086279_GRB_MCAL_627274999.673711.png.\n\nThe AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in\nthe energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35075.",
"published": "2023-11-17T11:45:11.938737Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T11:45:11.938772Z",
"modified": "2023-11-17T11:45:11.945283Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4730,
"topic": "gcn.circular",
"uuid": "d595960b-646d-4d39-9a1c-f2eb9d1d38e4",
"title": "GRB 231117A: GOTO optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"data": {
"date": "23/11/17 11:36:55 GMT",
"from": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35073"
},
"title": "GCN CIRCULAR",
"number": "35073",
"subject": "GRB 231117A: GOTO optical upper limits"
},
"message_text": "B. Godson, K. Ackley, B. P. Gompertz, J. Lyman, M. Dyer, D. Steeghs, A. Kumar, A. J. Levan, R. Starling, F. Jiménez-Ibarra, K. Ulaczyk, D. Galloway, V. Dhillon, P. O'Brien, G. Ramsay, K. Noysena, R. Kotak, R. Breton, L. Nuttall, E. Pallé, D. Pollacco, T. Killestein and D. O'Neill 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 GRB 231117A (Laha et al., GCN 35071; Navaneeth et al, GCN 35072) at 10:00:02 UT on 2023-11-17, starting approximately 7 hours after trigger. The observation consisted of a 4x90s 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 afterglow detected by Swift/XRT (Laha et al., GCN 35071) is seen to a 3-sigma limit of L > 20.4 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\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35073.",
"published": "2023-11-17T11:37:07.213490Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T11:37:07.213532Z",
"modified": "2023-11-17T11:37:07.224337Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4731,
"topic": "gcn.circular",
"uuid": "5d5d7f48-f497-4c46-94ba-189eae091440",
"title": "GRB 231117A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/17 11:40:38 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35074"
},
"title": "GCN CIRCULAR",
"number": "35074",
"subject": "GRB 231117A: 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 2459 s of XRT Photon Counting mode data and 3 UVOT\nimages for GRB 231117A, 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 = 332.38988, +13.52255 which is equivalent\nto:\n\nRA (J2000): 22h 09m 33.57s\nDec (J2000): +13d 31' 21.2\"\n\nwith an uncertainty of 2.0 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/35074.",
"published": "2023-11-17T11:40:45.477441Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T11:40:45.477463Z",
"modified": "2023-11-17T11:40:45.484527Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4736,
"topic": "gcn.circular",
"uuid": "cef01dc2-f9eb-45a7-827e-5c84e167777f",
"title": "GRB 231115A: optical observations from INAF observatories",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"data": {
"date": "23/11/17 13:48:03 GMT",
"from": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35077"
},
"title": "GCN CIRCULAR",
"number": "35077",
"subject": "GRB 231115A: optical observations from INAF observatories"
},
"message_text": "P. D'Avanzo (INAF-OAB), A. Reguitti (INAF-OAB / INAF-OAPd), L. Tomasella (INAF-OAPd), E. Cappellaro (INAF-OAPd), M. T. Botticella (INAF-OAC), F. Onori (INAF-OAAb), L. Tartaglia (INAF-OAAb), F. De Luise (INAF OAAB), M. G. Bernardini (INAF-OAB), S. Campana (INAF-OAB), S. Covino (INAF-OAB), V. D'Elia (ASI/SSDC & INAF/OAR), M . De Pasquale (Univ. of Messina), D. B. Malesani (DAWN/NBI & Radboud Univ.), E. Palazzi (INAF-OAS), A. Rossi (INAF-OAS), R. Salvaterra (INAF-IASF Mi), G. Tagliaferri (INAF-OAB), A. Melandri (INAF-OAR), E. Brocato (INAF-OAAb), M. Pedani, C. P. Padilla-Torres (INAF/TNG) report on behalf ot the CIBO and of the GRAWITA collaborations:\n\n\nWe carried out follow-up optical observations of the high-energy event detected by Fermi/GBM, INTEGRAL, Glowbug, Insight-HMXT/HE, Konus-Wind, Swift/BAT on 2023-11-15 at 15:36:21 UT, initially classified as the short/hard GRB 231115A and subsequently as a likely magnetar giant flare located in the M82 galaxy (Fermi GBM team, GCN Circ. 35035; D'Avanzo et al., GCN Circ. 35036; Mereghetti et al., GCN Circ. 35037; Dalessi et al., GCN Circ. 35044; Cheung et al., GCN Circ. 35045; Xue et al. GCN Circ. 35060; Frederiks et al., GCN Circ. 35062; Ronchini et al., GCN Circ. 35065).\n\nObservations from the INAF - Padova Astronomical Observatory located in Asiago (Italy) have been carried out with the Schmidt telescope starting on 2023-11-15 at 20:40:03 UT (~ 5 hours after the event T0) with the g, r and i filters.\nPreliminary analysis, which includes image subtraction with SDSS templates, does not show evidence for promising candidate counterparts within the INTEGRAL error circle (Mereghetti et al., GCN Circ. 35037).\nThe typical 3sigma limiting AB magnitudes at the position of the candidate counterpart AT2023xfj (Kumar et al., GCN Circ. 35041 and 35055) are g ~ 19.5 mag, r ~ 18.4 mag and i ~ 20.3 mag.\n\n\nObservations the from INAF - Abruzzo Astronomical Observatory located in Campo Imperatore (Italy) have been carried out starting on 2023-11-15 at 21:38:00 UT (~ 6 hours after the event T0) with the g, i and z filters.\nPreliminary analysis, which includes image subtraction with SDSS templates, does not show evidence for promising candidate counterparts within the INTEGRAL error circle.\nThe typical 3sigma limiting AB magnitudes at the position of the candidate counterpart AT2023xfj are g ~ 18.7 mag, i ~ 17.2 mag and z ~ 17.2 mag.\n\n\nObservations the from INAF - TNG located in Canary Islands (Spain) have have been carried out starting on 2023-11-16 at 03:27:28 UT (~ 12 hours after the event T0) with the r, i and z filters.\nPreliminary analysis, which includes image subtraction with SDSS and archival TNG templates, does not show evidence for promising candidate counterparts within the INTEGRAL error circle.\nThe typical 3sigma limiting AB magnitude at the position of the candidate counterpart AT2023xfj in the r filter is of ~ 22.0 mag.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35077.",
"published": "2023-11-17T13:48:14.317676Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T13:48:14.317700Z",
"modified": "2023-11-17T13:48:14.323831Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4797,
"topic": "gcn.circular",
"uuid": "d96e1a32-9f89-4b6e-bd99-dc74b07f6bdf",
"title": "Swift GRB231118.72: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/18 20:34:40 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35107"
},
"title": "GCN CIRCULAR",
"number": "35107",
"subject": "Swift GRB231118.72: 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 Swift GRB231118.72 (trigger No 1197311,00h 19m 22.32s , -48d 02m 06.0s, R=0.05) errorbox 10975 sec after notice time and 10996 sec after trigger time at 2023-11-18 20:19:50 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 21 deg. The sun altitude is -30.8 deg.\n\nThe galactic latitude b = -69 deg., longitude l = 317 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#09315\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 11087 | MASTER-SAAO | C | 180 | 19.2 |\n 11298 | MASTER-SAAO | C | 180 | 19.2 |\n 11437 | MASTER-SAAO | C | 60 | 18.9 |\n 11517 | MASTER-SAAO | C | 60 | 18.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35107.",
"published": "2023-11-18T20:34:52.315406Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T20:34:52.315432Z",
"modified": "2023-11-18T20:34:52.321904Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4733,
"topic": "gcn.circular",
"uuid": "68469ad5-54d8-4c31-8506-2a125046ed3d",
"title": "GRB 231117A : MITSuME Akeno optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "takei@hp.phys.titech.ac.jp",
"data": {
"date": "23/11/17 12:25:57 GMT",
"from": "takei@hp.phys.titech.ac.jp",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35076"
},
"title": "GCN CIRCULAR",
"number": "35076",
"subject": "GRB 231117A : MITSuME Akeno optical upper limits"
},
"message_text": "H. Takei, N. Higuchi, I. Takahashi, M. Sasada, M. Niwano, S. Sato, S. Hayatsu, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 231117A (Laha et al. GCN Circular #35071) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno.\n\nThe observation started at 2023-11-17 08:14:35 UT (5.19 hours after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the enhanced Swift/XRT error region (Beardmore et al. GCN Circular #35074). We obtained the 5-sigma limits of the stacked images as follows.\n\nT0+[hour] | MID-UT | T-EXP[sec] | 5-sigma limits\n------------------------------------------------------------------------------------------------\n6.38 | 2023-11-17 09:25:57 | 5160 | g'>19.9, Rc>19.9, Ic>19.3\n------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the trigger\nT-EXP: Total Exposure time\n\nWe used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35076.",
"published": "2023-11-17T12:26:08.107367Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T12:26:08.107387Z",
"modified": "2023-11-17T12:26:08.113702Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4743,
"topic": "gcn.circular",
"uuid": "9fcb46ba-0923-495f-b990-04d9ec3473c8",
"title": "Swift GRB 231117A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/17 15:42:59 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35082"
},
"title": "GCN CIRCULAR",
"number": "35082",
"subject": "Swift GRB 231117A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 231117A ( S. Laha et al., GCN 35071) errorbox 44404 sec after notice time and 44429 sec after trigger time at 2023-11-17 15:23:48 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 29 deg. The sun altitude is -17.8 deg.\n\nThe galactic latitude b = -34 deg., longitude l = 74 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#07518\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 44519 | MASTER-Kislovodsk | C | 180 | 18.0 |\n 44519 | MASTER-Kislovodsk | C | 180 | 17.9 |\n 44920 | MASTER-Kislovodsk | C | 180 | 18.5 |\n 44920 | MASTER-Kislovodsk | C | 180 | 19.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35082.",
"published": "2023-11-17T15:43:10.129844Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T15:43:10.129871Z",
"modified": "2023-11-17T15:43:10.139564Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4744,
"topic": "gcn.circular",
"uuid": "7bf51f82-fdc8-45eb-961f-1c6301edd1af",
"title": "GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory",
"submitter": "Hop gcn.circular",
"authors": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"data": {
"date": "23/11/17 16:16:49 GMT",
"from": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35083"
},
"title": "GCN CIRCULAR",
"number": "35083",
"subject": "GRB 231117A: afterglow candidate detection from Kinder observations with Lulin observatory"
},
"message_text": "S. Yang (HNAS), T.-W. Chen, C.-S. Lin, C.-C. Ngeow (NCUIA), Z.-N. Wang (HNAS), S. Smartt (Oxford/QUB), M. Fraser (UCD), J. Gillanders (Oxford), M.-H. Lee, Y.-C. Pan, H.-Y. Hsiao, W.-J. Hou, J.-K. Guo (NCUIA), M. Fulton, S. Srivastav, T. Moore, C. Angus, and A. Aamer (QUB) report:\n\nWe observed the field of GRB 231117A, a bright, short GRB discovered by the Swift BAT (Laha et al., GCN 35071). This burst is also detected by AstroSat (Navaneeth et al., GCN 35072), AGILE (Cattaneo et al., GCN 35075), Konus-Wind (Svinkin et al., GCN 35079), and Glowbug (Cheung et al., GCN 35081).\n\nWe used the 40cm SLT at Lulin Observatory, Taiwan to obtain r-band images of the field of GRB 231117A, as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The first SLT epoch of observations started at 10:26 UT on 17 of November 2023 (MJD = 60265.435), 7.39 hours after the Swift trigger. The images were combined from 14 frames with a 300-second exposure time for the r band, taken under seeing conditions of an average of 1\".93 and at a median airmass of 1.02. We then used the Lulin One-meter Telescope (LOT) to obtain g, r, i, and z-band images of this field starting on MJD = 60265.520, under seeing conditions of an average of 1\".39 and at a median airmass of 1.21.\n\nWe found a GRB afterglow candidate at the position:\n\nRA (J2000): 22h 09m 33.37s\nDec (J2000): +13d 31' 20.2â\n\nwhich is about 3\" away from the enhanced Swift-XRT position (Beardmore et al., GCN 35074). This afterglow condidate is right on the top of the faint galaxy, SDSS J220933.34+133119.5, with a petroMag_r = 21.32 +/- 0.22 mag. The likely host galaxy has a SDSS photo-z of 0.481 +/- 0.103 and a Legacy Survey photo-z of 0.342 +/- 0.131.\n\nWe used the Kinder pipeline (Yang et al. A&A 646, A22) to measure the PSF photometry of this afterglow candidate after template subtraction using the SDSS images. We obtained the following magnitudes (in the AB system):\n\nSLT r = 20.94 +/- 0.10 mag (exposure time of 300sec*14)\nLOT g = 20.90 +/- 0.10 mag (300sec*1),\nLOT r = 20.77 +/- 0.07 mag (300sec*7),\nLOT i = 20.52 +/- 0.11 mag (300sec*1) and,\nLOT z = 20.00 +/- 0.18 mag (SNR=2; 300sec*1).\n\nThe given limit is derived based on calibrating against SDSS field stars and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.06 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\nOur detection magnitudes are deeper than those non-detection reports from the GOTO (Godson et al., GCN 35073), MITSuME (Takei et al., GCN 35076) and ATLAS (Gillanders et al., GCN 35080).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35083.",
"published": "2023-11-17T16:17:00.127221Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T16:17:00.127250Z",
"modified": "2023-11-17T16:17:00.258545Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4737,
"topic": "gcn.circular",
"uuid": "5d785797-4c0d-46cc-a629-930ef855a599",
"title": "GRB 231115A : OHP/T120 optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"data": {
"date": "23/11/17 14:17:47 GMT",
"from": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35078"
},
"title": "GCN CIRCULAR",
"number": "35078",
"subject": "GRB 231115A : OHP/T120 optical upper limit"
},
"message_text": "D. Turpin (CEA Paris-Saclay), W. Thuillot (Obs. Paris/IMCCE), D. Souami (Obs. Paris/LESIA), C. Adami (LAM), E. Le Floc'h, D. Götz, F. Schüssler (CEA Paris-Saclay), A. de Ugarte Postigo (OCA/CNRS), S. Basa (Pytheas/OHP/LAM), S. D. Vergani (GEPI, Obs. de Paris), report on behalf of a larger collaboration:\n\nWe observed the field of GRB 231115A, likely a Giant flare from a magnetar in M82 (Fermi GBM Team, GCN 35035; Mereghetti et al., GCN 35037, Dalessi et al. GCN 35044, Cheung et al. GCN 35045, Xue et al., GCN 35060, Frederiks et al. GCN 35062) using the T120cm telescope at Observatoire de Haute-Provence (France). We began our observations of the M82 field on 2023 15 November 22:57:23.78 (~7.35h after the INTEGRAL trigger time) with a series of R-band (1400s), V-band (600s) and sdss-i (300s) images. The limiting magnitudes of our images are R> 21.1, V>20.9 and i>19.2 but are strongly reduced in the vicinity of M82 due to its bright diffuse background light.\n\nAfter inspecting our residual images from the subtraction of both the PS1 catalog images and our archival own M82 images, we do not detect any new source inside the INTEGRAL localization. We also do not detect any credible counterpart at the location of the transient candidate reported by Kumar et al. GCN 35041.\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and the magnitude is not corrected for Galactic extinction.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35078.",
"published": "2023-11-17T14:17:59.486744Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T14:17:59.486764Z",
"modified": "2023-11-17T14:17:59.493056Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4738,
"topic": "gcn.circular",
"uuid": "2115a485-ecf3-49e3-89fb-5ff89541a822",
"title": "Konus-Wind detection of GRB 231117A (short/hard)",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "23/11/17 14:21:53 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35079"
},
"title": "GCN CIRCULAR",
"number": "35079",
"subject": "Konus-Wind detection of GRB 231117A (short/hard)"
},
"message_text": "D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,\nYu. Temiraev, A. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe bright, short-duration GRB 231117A\n(Swift-BAT detection: Laha et al., GCN Circ. 35071;\nAstroSat-CZTI detection: Navaneeth et al., GCN Circ. 35072;\nAGILE-MCAL detection: Cattaneo et al., GCN Circ. 35075)\ntriggered Konus-Wind at T0\u0010998.926 s UT (03:03:18.926).\n\nThe burst light curve shows a single pulse\nwhich starts at ~T0 and has a total duration of ~0.7 s.\nThe emission is seen up to ~10 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231117_T10998/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 9.10(-0.94,+0.97)x10^-6 erg/cm2,\nand a 16-ms peak flux, measured from T0+0.052 s,\nof 5.88(-1.01,+1.03)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum of the burst\n(measured from T0 to T0+0.256 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) model with the following parameters:\nthe low-energy photon index alpha = -1.15(-0.11,+0.13),\nthe high energy photon index beta = -2.81(-7.19,+0.43),\nthe peak energy Ep = 400(-82,+89) keV\n(chi2 = 45/51 dof).\n\nAll the quoted errors are at the 90% confidence level.\nAll the quoted values are preliminary.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35079.",
"published": "2023-11-17T14:22:01.927536Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T14:22:01.927570Z",
"modified": "2023-11-17T14:22:01.934715Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4739,
"topic": "gcn.circular",
"uuid": "cbc6d97b-bb2a-4671-96b6-e9164e46b2dc",
"title": "GRB 231117A: ATLAS non-detection of an optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "James Gillanders at University of Oxford <jhgillanders.astro@gmail.com>",
"data": {
"date": "23/11/17 14:22:29 GMT",
"from": "James Gillanders at University of Oxford <jhgillanders.astro@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35080"
},
"title": "GCN CIRCULAR",
"number": "35080",
"subject": "GRB 231117A: ATLAS non-detection of an optical counterpart"
},
"message_text": "J. H. Gillanders (Oxford), S. J. Smartt, S. Srivastav (Oxford/QUB), M. D. Fulton, K. W. Smith, A. Aamer, C. R. Angus, M. McCollum, T. Moore, M. Nicholl, X. Sheng, J. Weston, D. R. Young (QUB), P. Ramsden (QUB/Birmingham), L. Shingles (GSI/QUB), A. Andersson, S. Ramaiya, L. Rhodes, H. Stevance (Oxford), J. Sommer (LMU/QUB), L. Denneau, J. Tonry, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard).\n\nHere we report optical observations in the field of the Swift-BAT discovered GRB 231117A (Laha et al. GCN Circ. 35071), obtained during normal survey operations with ATLAS.\n\nATLAS is a quadruple 0.5-m telescope system with two units in Hawaii, one in Chile and one in South Africa (see Tonry et al. 2018, PASP, 130:064505), routinely surveying the visible sky on a daily basis. We promptly process all data with our transient science server (Smith et al. 2020, PASP, 132:085002).\n\nThe ATLAS system observed the field of the GRB 231117A in normal survey mode 3.3-hr after the GRB trigger date of MJD 60265.127 ( 23-11-17 03:03:19 UT, hereafter T0). We obtained forced photometry at the enhanced Swift-XRT X-ray source coordinates of RA = 332.38988, Dec = +13.52255 (Beardmore et al. GCN Circ. 35074). We found no historical detections of any excess optical flux at this position, or at any location within the XRT and BAT error regions.\n\nForced photometry at those coordinates results in the following most recent non-detection in the ATLAS c-band. These measurements are not corrected for any Galactic dust extinction.\n\nExp. time (s) = 120 (4 x 30)\nMJD = 60265.310 (T0 + 3.3-hr)\nFlux (uJy) < 19 (3-sigma)\nMag (AB) > 20.7 (3-sigma)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35080.",
"published": "2023-11-17T14:22:35.980370Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T14:22:35.980389Z",
"modified": "2023-11-17T14:22:35.986721Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4742,
"topic": "gcn.circular",
"uuid": "939dc6e7-fc64-496b-a1ca-f3496829fdc5",
"title": "GRB 231117A (short): Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "23/11/17 15:20:49 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35081"
},
"title": "GCN CIRCULAR",
"number": "35081",
"subject": "GRB 231117A (short): Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report: \n\nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of the short burst, GRB 231117A, which was also detected by Swift/BAT, AstroSat/CZTI, AGILE, and Konus/Wind (GCN 35071, 35072, 35075, 35079). \n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-11-17 03:03:18.592 with a duration of 1.024 s and a total significance of about 124.0 sigma. The light curve comprises a single FRED-shaped pulse.\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=0.2 and a cutoff energy (\"Epeak\") of 461 keV. The modeled 10-10000 keV fluence is 5.1e-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/35081.",
"published": "2023-11-17T15:21:05.523079Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T15:21:05.523104Z",
"modified": "2023-11-17T15:21:05.532411Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4746,
"topic": "gcn.circular",
"uuid": "50e098e1-0869-4672-b97f-b96909f36a53",
"title": "GRB231117A: AGILE/MCAL analysis",
"submitter": "Hop gcn.circular",
"authors": "Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>",
"data": {
"date": "23/11/17 16:47:51 GMT",
"from": "Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35085"
},
"title": "GCN CIRCULAR",
"number": "35085",
"subject": "GRB231117A: AGILE/MCAL analysis"
},
"message_text": "C. Casentini (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), P.W. Cattaneo (INFN Pavia), F. Longo (Univ. Trieste, and INFN Trieste), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, G. Piano (INAF/IAPS), L. Baroncelli, A. Bulgarelli, A. Ciabattoni, A. Di Piano, V. Fioretti (INAF/OAS-Bologna), G. Panebianco (Univ. Bologna - INAF/OAS Bologna), N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli (SSDC, and INAF/OAR), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), A. Ursi (ASI and INAF/IAPS), I. Donnarumma, E. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi), F. Cutrona (Univ. Milano Bicocca) and P. Tempesta (TeleSpazio) report on behalf of the AGILE Team:\n\nWe carried out further analysis of the AGILE/MCAL data of GRB 231117A (GCNs #35071, #35072, #35073, #35074, #35075, #35076, #35079, #35080, #35081, #35082, #35083, #35084).\n\nThe burst released 415 counts in the detector in 0.14s, above a background rate of 532 Hz.\n\nThe spectral analysis shows a clear component up to 5 MeV.\n\nThe time-integrated spectrum of the burst can be fitted in the energy range 0.4-2.0 MeV with a power-law model with alpha = -2.3 (+/-0.2). The fit results in a reduced chi-squared of 1.204 (21 d.o.f.) and a fluence of 2.4e-06 erg/cm^2, in the energy range 0.4-10 MeV.\n\nAdditional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at:\nhttps://gcn.gsfc.nasa.gov/agile_mcal.html.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35085.",
"published": "2023-11-17T16:48:03.534997Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-17T16:48:03.535018Z",
"modified": "2023-11-17T16:48:03.542371Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6390,
"topic": "gcn.circular",
"uuid": "634b5881-9eff-4f9a-9f50-8944c84eb935",
"title": "Fermi-LAT gamma-ray observations of IceCube-240327A",
"submitter": "Hop gcn.circular",
"authors": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"data": {
"date": "24/04/06 18:45:58 GMT",
"from": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36042"
},
"title": "GCN CIRCULAR",
"number": "36042",
"subject": "Fermi-LAT gamma-ray observations of IceCube-240327A"
},
"message_text": "S. Garrappa (Weizmann Institute of Science), C. Bartolini (INFN Bari), S. Buson (DESY; Univ. of Wuerzburg), L. Pfeiffer (Univ. of Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC240327A high-energy neutrino event (GCN 35983) 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 2024-03-27 at 11:04:49.50 UT (T0) with J2000 position RA = 25.40 (+1.86, -2.36) deg, Decl. = +7.78 (+0.69, -0.68) deg (90% PSF containment). There are no catalogued gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources located within the 90% IC240327A localization region.\n\nWe searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC240327A best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240327A best-fit position, the >100 MeV flux upper limit (95% confidence) is < 8.1e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-03-27 UTC), and < 6.3e-9 (< 3.2e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact persons is S. Garrappa (simone.garrappa at weizmann.ac.il).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36042.",
"published": "2024-04-06T18:46:14.210984Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-06T18:46:14.210997Z",
"modified": "2024-04-06T18:46:14.218324Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4763,
"topic": "gcn.circular",
"uuid": "e3354539-7b0e-4699-bc94-cf0643668745",
"title": "GRB 231117A: GIT optical follow-up",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/11/18 01:51:44 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35089"
},
"title": "GCN CIRCULAR",
"number": "35089",
"subject": "GRB 231117A: GIT optical follow-up"
},
"message_text": "R. Kumar, A. Salgundi, V. Swain, V. Bhalerao (IIT Bombay), G. C. Anupama, S. Barway (IIA), R. Norboo (IAO)\n\nWe observed the field of GRB 231117A detected by Swift (S. Laha et al., GCN 35071) with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2023-11-17 13:36:59 UT, i.e., 10.56 hours after the Swift trigger. We obtained the multiple images of 300s each in the r' and g' band. We did not detect any source within the uncertainty radius of Swift-XRT position reported by A.P. Beardmore et al., GCN 35074 upto a limiting magnitude of 22.38 in r' band. We do detect the candidate optical afterglow in our subtracted image at the position reported by Yang et al. (GCN 35083). The photometry values are given below:\n\n------------------------------------------------------------------------\n\n| JD (mid) | t-t0 (days) | Filter | Exposure (s) | Magnitude (5 sigma) |\n\n------------------------------------------------------------------------\n\n| 2460266.072780335 | 0.445 | r' | 3 x 300 | 20.80 +/- 0.06 |\n| 2460266.087725621 | 0.460 | r' | 3 x 300 | 21.18 +/- 0.08 |\n| 2460266.098941961 | 0.471 | r' | 3 x 300 | 20.88 +/- 0.07 |\n| 2460266.203419748 | 0.576 | r' | 3 x 300 | 20.84 +/- 0.07 |\n| 2460266.253062681 | 0.625 | g' | 2 x 300 | 20.88 +/- 0.07 |\n\n------------------------------------------------------------------------\n\nOur data shows slight variability in the source, but no clear decay. The results are comparable to the values reported by B. P. Gompertz et al., GCN 35088; J. C. Rastinejad et al., GCN 35087; Yang et al., GCN 35083; and consistent with the upper limits given by M.Ferro et al., GCN 35086; M. Odeh et al., GCN 35084; J. H. Gillanders et al., GCN 35080; H. Takei., GCN 35076; B. Godson et al., GCN 35073. Based on these measurements, we conclude that this source is unlikely to be the afterglow. The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\n\nThe GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35089.",
"published": "2023-11-18T01:51:55.398420Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T01:51:55.398441Z",
"modified": "2023-11-18T01:51:55.404921Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4765,
"topic": "gcn.circular",
"uuid": "0f3da2c6-7e59-4b89-94e8-ce62fb30a4d4",
"title": "GRB 231115A: JinShan optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/11/18 02:05:01 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35091"
},
"title": "GCN CIRCULAR",
"number": "35091",
"subject": "GRB 231115A: JinShan optical upper limits"
},
"message_text": "J. An, S.Q. Jiang, X. Liu, S.Y. Fu, Z.P. Zhu, T.H. Lu, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration:\n\nWe observed the field of GRB 231115A detected by the Fermi GBM (Fermi GBM Team, GCN 35035), INTEGRAL (Mereghetti et al., GCN 35037), and Glowbug (Cheung et al., GCN 35045), using two 50cm telescopes (50A, 50B) located at Altay, Xinjiang, China. Observations started at 17:30:51 UT on 2023-11-15, i.e., 1.91 hr after the Fermi/GBM trigger, in the Sloan g-/r-/i-/z- bands.\n\nNo credible optical transient is detected in our stacked images within and beside the error region of the INTEGRAL. Preliminary results are as follows:\n-----------------------------------------------------------------\n Tmid(UT) exp(s) filter UL(3-sigma)\n-----------------------------------------------------------------\n2023-11-15T17:47:17 60sx30 g 20.4\n2023-11-15T18:20:18 60sx30 r 20.3\n2023-11-15T18:34:16 30sx60 i 18.1\n2023-11-15T17:54:39 30sx66 z 16.0\n-----------------------------------------------------------------\n\ncalibrated with nearby PanSTARRS stars. The magnitude is not corrected for Galactic extinction. The z-band upper limit is shallower than expected due to a technical issue.\n\nAltay Astronomical Time-Domain Project (JinShan Project for short) consists of four 50cm telescopes with FOV of 1.7x1.7 deg^2 for each (50A, 50B, 50C, and 50D), two 100cm telescopes with FOV of 1.4x1.4 deg^2 for each (100A and 100B), and one 100cm telescope with FOV of 14x14 arcmin^2 (100C). Each telescope is equipped with different filters. JinShan is now at its early commissioning stage.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35091.",
"published": "2023-11-18T02:05:12.086390Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T02:05:12.086430Z",
"modified": "2023-11-18T02:05:12.093467Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4768,
"topic": "gcn.circular",
"uuid": "06855517-9cbe-4c37-9ed4-b88bab1812a9",
"title": "GRB 231115A: Wendelstein Optical/Infrared Observations",
"submitter": "Hop gcn.circular",
"authors": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"data": {
"date": "23/11/18 04:18:45 GMT",
"from": "Antonella Palmese at Carnegie Mellon University <apalmese@andrew.cmu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35092"
},
"title": "GCN CIRCULAR",
"number": "35092",
"subject": "GRB 231115A: Wendelstein Optical/Infrared Observations"
},
"message_text": "Lei Hu (CMU), Malte Busman (LMU), Daniel Gruen (LMU), Antonella Palmese (CMU), Brendan OâConnor (CMU), Arno Riffeser (LMU/MPE), Ananya Shankar (LMU), Raphael Zoeller (LMU) report:\n\nWe observed the position of GRB 231115A (Fermi GBM team, GCN 35035) with the 2m Fraunhofer telescope at Wendelstein Observatory, Germany. Observations were obtained using the 3kk imager in the r, i, and J bands simultaneously, and then in r, i, and H bands. Observations started on 2023-11-16 at 00:39 UT with a total exposure time of 7200 seconds in r and i, and 3600 seconds in J, H.\n\nWe performed difference imaging in r band with deep archival Wendelstein Wide Field Imager observations of M82 using the SFFT pipeline (Hu et al. 2022). We do not detect any source at the location of GIT231115AA / AT2023xvj (Kumar et al, GCN 35041) to depth r> 22.5 (5sigma depth). We identify 2 new sources:\n\nName | RA (J2000 deg) | dec (J2000 deg) | r (AB mag)\n----------------------\nW231115a | 148.9711390 | 69.6730597 | 20.54 +/- 0.04\nW231115b | 148.9950500 | 69.6912555 | 21.26 +/- 0.08 \n\nW231115a is also detected in i, J, and H, while W231115b is only detected in r and i. We cannot exclude that these are variable objects associated with previously detected sources in archival HST data. Further analysis is underway.\n\nThe magnitudes are not corrected for Milky Way extinction and the photometry was calibrated against nearby stars in the PS1 and 2MASS catalogs. We thank the staff of the Wendelstein Observatory for obtaining these observations.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35092.",
"published": "2023-11-18T04:18:56.241862Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T04:18:56.241885Z",
"modified": "2023-11-18T04:18:56.252493Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6391,
"topic": "gcn.circular",
"uuid": "29b46534-1ff5-4dec-9b20-7b3fd33a37cb",
"title": "Fermi-LAT gamma-ray observations of IceCube-240327B",
"submitter": "Hop gcn.circular",
"authors": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"data": {
"date": "24/04/06 18:47:40 GMT",
"from": "Simone Garrappa at DESY <simone.garrappa@desy.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36043"
},
"title": "GCN CIRCULAR",
"number": "36043",
"subject": "Fermi-LAT gamma-ray observations of IceCube-240327B"
},
"message_text": "S. Garrappa (Weizmann Institute of Science), C. Bartolini (INFN Bari), S. Buson (DESY; Univ. of Wuerzburg), L. Pfeiffer (Univ. of Wuerzburg) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC240327B high-energy neutrino event (GCN 35984) 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 2024-03-27 at 16:12:30.47 UT (T0) with J2000 position RA = 89.21 (+1.36, -1.55) deg, Decl. = +0.93 (+1.23, -1.47) deg (90% PSF containment). There are five catalogued gamma-ray (>100 MeV; The Fermi-LAT collaboration 2022, ApJS, 260, 53) sources located within the 90% IC240327B localization region.Based on a preliminary analysis of the LAT data over the timescales of 1-month and 1-day prior to T0, these objects are not significantly detected (> 5 sigma).\n\nWe searched for intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (> 5 sigma) new excess emission (> 100 MeV) at the IC240327B best-fit position. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IC240327B best-fit position, the >100 MeV flux upper limit (95% confidence) is < 9.5e-10 ph cm^-2 s^-1 for ~15-years (2008-08-04 to 2024-03-27 UTC), and < 3.4e-8 (< 3.6e-7) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0.\n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact persons is S. Garrappa (simone.garrappa at weizmann.ac.il <http://eizmann.ac.il/>).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36043.",
"published": "2024-04-06T18:47:47.310828Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-06T18:47:47.310840Z",
"modified": "2024-04-06T18:47:47.318858Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6741,
"topic": "gcn.circular",
"uuid": "663f023f-0fa6-41d3-97c5-4bb00ec26275",
"title": "EP240414a: Near-IR observations with NIRES and WINTER",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "24/04/20 04:42:12 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36189"
},
"title": "GCN CIRCULAR",
"number": "36189",
"subject": "EP240414a: Near-IR observations with NIRES and WINTER"
},
"message_text": "Viraj Karambelkar (Caltech), Kaew Tinyanont (NARIT), Sam Rose (Caltech),\nTomas Ahumada (Caltech), Robert Stein (Caltech), Nathan Lourie (MIT),\nDanielle Frostig (MIT), Geoffrey Mo (MIT), Robert Simcoe (MIT), Mansi\nKasliwal (Caltech)\n\nWe observed the location of the X-ray transient EP240414a (Lian et al., GCN\n36091) in the K-prime band with the NIRES acquisition camera on the Keck II\ntelescope starting at UTC 2024-04-19T08:15:11. Our observations lasted for\n100 seconds (25 sec, 4 coadds).\n\nWe detect the optical counterpart (GCN 36094, 36105, 36110, 36130, 36150,\n36154, 36171, 36187) in the near-infrared Kp-band with m_Kp ~ 19.8 +/- 0.1\nmag (AB). This suggests an r - Kp color of ~ 1 mag, based on r-band\nphotometry from 0.7 days earlier (reported in Wang et al. GCN #36171).\n\nWe also observed the location with the WINTER camera on the Palomar 40-inch\ntelescope (Lourie et al. 2021) in the J-band on UTC 2024-04-24T06:22:01 and\ndid not detect the source to a limit of m_J ~ 19 mag (AB).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36189.",
"published": "2024-04-20T04:42:29.194062Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-20T04:42:29.194090Z",
"modified": "2024-04-20T04:42:29.200233Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4769,
"topic": "gcn.circular",
"uuid": "69321dee-0eb7-4938-ad75-f34a1807e280",
"title": "GRB 231117A: Keck spectroscopy of afterglow candidate",
"submitter": "Hop gcn.circular",
"authors": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"data": {
"date": "23/11/18 06:10:57 GMT",
"from": "Tomas Ahumada Mena at Caltech <tahumada@caltech.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35093"
},
"title": "GCN CIRCULAR",
"number": "35093",
"subject": "GRB 231117A: Keck spectroscopy of afterglow candidate"
},
"message_text": "Tomas Ahumada, Yashvi Sharma(Caltech) on behalf of a larger collaboration:\n\nWe report optical spectroscopic observations of the candidate counterpart of the short GRB 231117A (GCN 35083, 35071) with the Low Resolution Imaging Spectrometer (LRIS, Oke et al. 95) at the Keck I Observatory (C358, PI: Kasliwal). Observations started 2023-11-18 05:19:00 (~1.1 days after the burst), and consisted of 2x900 exposures with the 400/3400 grism and 400/8500 grating.\n\nThe spectrum shows narrow galaxy lines at redshift of z = 0.257 (H, [O II], [O III], N II). We also see narrow absorption lines consistent with MgII(2796,2803) doublet at this redshift. We note the spectrum shows a blue continuum.\n\nWe thank Michael Lundquist and the Keck team for their support during this Target of Opportunity trigger.\n\nThe data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35093.",
"published": "2023-11-18T06:11:08.555447Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T06:11:08.555468Z",
"modified": "2023-11-18T06:11:08.566208Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6743,
"topic": "gcn.circular",
"uuid": "fc71feef-a53e-47ef-8d60-f6c9a7bfbf45",
"title": "LIGO/Virgo/KAGRA S240420aw: Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "24/04/20 05:17:10 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36190"
},
"title": "GCN CIRCULAR",
"number": "36190",
"subject": "LIGO/Virgo/KAGRA S240420aw: Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S240420aw is no longer considered to be a candidate of interest. There was a high rate of noise transients (glitches) in the LIGO Hanford detector, which created spurious false alarms in the minutes surrounding the time of this candidate.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36190.",
"published": "2024-04-20T05:17:28.592309Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-20T05:17:28.592328Z",
"modified": "2024-04-20T05:17:28.600173Z",
"nonlocalizedevents": [
{
"event_id": "S240420a"
}
],
"targets": []
},
{
"id": 6815,
"topic": "gcn.circular",
"uuid": "e812f0ef-79ce-4050-8b3c-e9f785bba01c",
"title": "GRB240421B: Zadko Observations",
"submitter": "Hop gcn.circular",
"authors": "Bruce Gendre at UWA <bruce.gendre@gmail.com>",
"data": {
"date": "24/04/22 02:30:22 GMT",
"from": "Bruce Gendre at UWA <bruce.gendre@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36221"
},
"title": "GCN CIRCULAR",
"number": "36221",
"subject": "GRB240421B: Zadko Observations"
},
"message_text": "B. Gendre, E. Moore, F. Panther, D. Coward, J. A. Moore (OzGrav-UWA),\nand A. Klotz (IRAP-CNRS-OMP),\nreport:\n\nWe imaged the field of GRB 240421B detected by SWIFT\n(trigger 1223470) with the Zadko robotic telescope (D\u00100cm)\nlocated at the observatory - Gingin, Australia.\n\nThe observations started 7.97h after the GRB trigger.\nThe elevation of the field increased from\n25 degrees above horizon and weather conditions\nwere good.\n\nThe date of trigger : t0 = 2024-04-21T09:42:54.050\n\nThe first image is 60.0s exposure in tracking mode:\nt0+28754.8s to t0+28814.8s : R > 16.2\n\nWe co-added a series of exposures:\nt0+28754.8s to t0+29599.3s : R > 17.7\n\nMagnitudes were estimated with the nearby USNO-B1 stars\nand are not corrected for galactic dust extinction.\n\nN.B. Galactic coordinates are lon= 26.7039 lat=-21.4736\nand the galactic extinction in R band is 0.7 magnitudes\nestimated from D. Schlegel et al. 1998ApJ...500..525S.\n\nThis message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36221.",
"published": "2024-04-22T02:30:39.230009Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-22T02:30:39.230046Z",
"modified": "2024-04-22T02:30:39.235867Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4775,
"topic": "gcn.circular",
"uuid": "c62ff95b-4f17-4452-a108-97eab573d56f",
"title": "LIGO/Virgo/KAGRA S231118ab: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "valeria.sequino@na.infn.it",
"data": {
"date": "23/11/18 08:05:49 GMT",
"from": "valeria.sequino@na.infn.it",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35094"
},
"title": "GCN CIRCULAR",
"number": "35094",
"subject": "LIGO/Virgo/KAGRA S231118ab: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231118ab during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-11-18 07:14:02.239 UTC (GPS time: 1384326860.239). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS231118ab is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.9e-08 Hz, or about one in 1 year, 8 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231118ab\n\nThe classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [6] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 29 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [7], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 3197 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4531 +/- 1498 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35094.",
"published": "2023-11-18T08:06:00.582724Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T08:06:00.582757Z",
"modified": "2023-11-18T08:06:00.590953Z",
"nonlocalizedevents": [
{
"event_id": "S231118a"
}
],
"targets": []
},
{
"id": 4781,
"topic": "gcn.circular",
"uuid": "94c82852-8112-4ff3-8f0c-d24b9b10151e",
"title": "GRB 231117A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/11/18 09:27:43 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35095"
},
"title": "GCN CIRCULAR",
"number": "35095",
"subject": "GRB 231117A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe short-duration GRB 231106B (Swift/BAT detection: GCN 35071; AstroSat detection: GCN 35072; AGILE/MCAL detection: GCN 35075; Konus/Wind detection: GCN 35079; Glowbug detection: GCN 35081; CALET/CGBM detection: trigger no. 1384225326) 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 2023-11-17 03:03:19 UTC. The T90 duration measured by GRBAlpha is 1 s and the overall significance during T90 reaches 14 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231117A_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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35095.",
"published": "2023-11-18T09:27:54.962219Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T09:27:54.962241Z",
"modified": "2023-11-18T09:27:54.968455Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4782,
"topic": "gcn.circular",
"uuid": "421716d5-880d-4944-ae25-c8e83640630e",
"title": "LIGO/Virgo/KAGRA S231118an: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Annalisa Allocca at Università di Napoli Federico II <annalisa.allocca@na.infn.it>",
"data": {
"date": "23/11/18 09:43:30 GMT",
"from": "Annalisa Allocca at Università di Napoli Federico II <annalisa.allocca@na.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35096"
},
"title": "GCN CIRCULAR",
"number": "35096",
"subject": "LIGO/Virgo/KAGRA S231118an: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231118an during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-11-18 09:06:02.009 UTC (GPS time: 1384333580.009). The candidate was found by the GstLAL [1], MBTA [2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS231118an is an event of interest because its false alarm rate, as estimated by the online analysis, is 7.5e-08 Hz, or about one in 5 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231118an\n\nThe classification of the GW signal, in order of descending probability, is BBH (74%), Terrestrial (24%), NSBH (1%), or BNS (<1%).\n\nFor this candidate, the classification of the GW signal is biased such that the probability of NSBH (1.4%) and BNS (0%) are overestimated while that of Terrestial (24%) is underestimated. The bug is being fixed. Astronomers are advised to keep this in mind while deciding to follow this event.\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is 2%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 1048 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1396 +/- 377 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35096.",
"published": "2023-11-18T09:43:40.726314Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T09:43:40.726335Z",
"modified": "2023-11-18T09:43:40.732617Z",
"nonlocalizedevents": [
{
"event_id": "S231118a"
}
],
"targets": []
},
{
"id": 4783,
"topic": "gcn.circular",
"uuid": "fc676b01-2beb-4330-8617-0467165c9c3f",
"title": "GRB 231117A: ATCA detection of a radio counterpart",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/11/18 10:44:18 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35097"
},
"title": "GCN CIRCULAR",
"number": "35097",
"subject": "GRB 231117A: ATCA detection of a radio counterpart"
},
"message_text": "L. Rhodes (Oxford), G. E. Anderson (Curtin), A. J. van der Horst (GWU),J. K. Leung (UofT/HUJI), S. D. Ryder (Macquarie), A. Gulati (USyd), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration\n\n\n\nThe Australia Telescope Compact Array (ATCA) observed short GRB 231117A (Laha et al., GCN 35071) as part of the Large ATCA \"PanRadio GRB\" follow-up programme C3542 (PI. Anderson) starting at 2023-11-17 04:00UT for 11hours.\n\n\n\nWe detect a radio source with a flux density of ~210uJy/beam at 9GHz at coordinates consistent with both those given by the XRT and the Lulin Observatory (A.P. Beardmore et al., GCN 35074; S. Yang et al., GCN 35083).\n\n\n\nFurther observations are planned.\n\n\n\nWe thank the CSIRO Space and Astronomy staff for supporting these observations.\n\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\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35097.",
"published": "2023-11-18T10:44:28.733206Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T10:44:28.733227Z",
"modified": "2023-11-18T10:44:28.739443Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6392,
"topic": "gcn.circular",
"uuid": "5151beda-5a62-4f83-b6ec-2f311affdc55",
"title": "GRB 240407A: 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": "24/04/07 01:10:24 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36044"
},
"title": "GCN CIRCULAR",
"number": "36044",
"subject": "GRB 240407A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 00:59:51 UT on 7 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240407A (trigger 734144396.810938 / 240407042).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 352.3, Dec = 44.9 (J2000 degrees, equivalent to J2000 23h 29m, 44d 53'), with a statistical uncertainty of 1.7 degrees.\n\nThe angle from the Fermi LAT boresight is 88.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240407042/quicklook/glg_skymap_all_bn240407042.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/bn240407042/quicklook/glg_healpix_all_bn240407042.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240407042/quicklook/glg_lc_medres34_bn240407042.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36044.",
"published": "2024-04-07T01:10:43.223307Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-07T01:10:43.223331Z",
"modified": "2024-04-07T01:10:43.232182Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4784,
"topic": "gcn.circular",
"uuid": "b354d6a9-38a2-407f-bad1-b13eebf696a0",
"title": "GRB 231117A: ePESSTO+ host galaxy redshift confirmation",
"submitter": "Hop gcn.circular",
"authors": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"data": {
"date": "23/11/18 13:08:05 GMT",
"from": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35098"
},
"title": "GCN CIRCULAR",
"number": "35098",
"subject": "GRB 231117A: ePESSTO+ host galaxy redshift confirmation"
},
"message_text": "M. Gonzalez-Bañuelos, M. Kopsacheili (ICE), P. D'Avanzo (INAF-OAB), D. B. Malesani (DAWN/NBI and Radboud univ.), L. Galbany, T. Müller-Bravo (ICE), C. Gutierrez (IEEC/ICE-CSIC), M. Dennefeld (IAP), A. Gkini (Stockholm), N. Ihanec (Warsaw and ING), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (QUB), O. Yaron (Weizmann), D. Young (QUB), report on behalf of the ePESSTO+ collaboration:\n\nWe observed the candidate counterpart of the short GRB 231117A (Laha et al., GCN Circ. 35071; Navaneeth et al., GCN Circ. 35072; Cattaneo et al., GCN Circ. 35075; Svinkin et al., Gin Circ. 35079; Cheung et al. GCN Circ. 35081; Dafcikova et al. GCN Circ. 35095) under the advanced Public ESO Spectroscopic Survey for Transient Objects (ePESSTO+; see Smartt et al. 2015, A&A, 579, 40; http://www.pessto.org) The observations were performed with the ESO New Technology Telescope (NTT) at La Silla equipped with the EFOSC2 instrument in spectroscopic mode, starting on 2023 Nov 18 at 00:22:34 UT (i.e. 21.3 hr after the burst) and using grism 13 (covering the wavelength range 3985-9315 AA). \n\nThe 1.5\" slit was oriented in order to cover both the optical afterglow and the host galaxy candidate positions (Yang et al., GCN Circ. 35083; Rastinejad et al., GCN 35087; Gompertz & Ackley, GCN 35088). However, the observations were carried out under poor seeing conditions (1.7\") and in the acquisition image the two objects cannot be distinguished.\n\nThe spectrum shows prominebt emission features, which we identify as [O II], [O III] and Halpha at a common redshift z = 0.257, in agreement with the findings of Ahumada et al. (GCN Circ. 35093). No clear absorption features are detected.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35098.",
"published": "2023-11-18T13:08:15.183150Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T13:08:15.183171Z",
"modified": "2023-11-18T13:08:15.190644Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4785,
"topic": "gcn.circular",
"uuid": "dc39339a-ce33-4217-824c-8cd9f75cb147",
"title": "GRB 231117A: Lowell Discovery Telescope Observations",
"submitter": "Hop gcn.circular",
"authors": "Brendan O'Connor at Carnegie Mellon University <boconno2@andrew.cmu.edu>",
"data": {
"date": "23/11/18 17:18:44 GMT",
"from": "Brendan O'Connor at Carnegie Mellon University <boconno2@andrew.cmu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35099"
},
"title": "GCN CIRCULAR",
"number": "35099",
"subject": "GRB 231117A: Lowell Discovery Telescope Observations"
},
"message_text": "I. Andreoni (JSI/UMD/NASA-GSFC), G. Srinivasaragavan (UMD), B. O'Connor (CMU), T. Ahumada (Caltech), S. B. Cenko (NASA-GSFC), J. Durbak (UMD), E. Hammerstein (UMD), N. Klingler (UMBC/NASA-GSFC), A. Kutyrev (NASA-GSFC), L. Singer (NASA-GSFC), S. Veilleux (UMD):\n\nWe report target of opportunity follow-up observations of GRB 231117A (Laha et al., GCN 35071; Navaneeth et al., GCN 35072; Beardmore et al., GCN3574; Cattaneo et al., GCN 35075; Svinkin et al., GCN 35079; Cheung et al., GCN 35081, Dafcikova et al., GCN 53095) with the Large Monolithic Imager (LMI) mounted at the Lowell Discovery Telescope (LDT) located in Flagstaff, AZ, under program M01 (PI: Andreoni).\n\nObservations started on 2023-11-18 at 01:46 UT (~22.7 hr after the GRB trigger). We obtained sets of 4x150s exposures for each g-r-i-z filter. The candidate afterglow identified by Yang et al.; GCN 35083 (also detected by Rastinejad et al., GCN 35087; Gompertz et al., GCN 35088; Kumar et al., GCN 35089, Ahumada et al., GCN 35093; Rhodes et al., GCN 35097) is well detected. Preliminary photometry of the images, with contribution from the host galaxy included and not corrected for Galactic extinction, was measured as follows in the AB magnitude system:\n\ng = 20.55 +/- 0.04 mag\nr = 20.20 +/- 0.04 mag\ni = 20.05 +/- 0.04 mag\nz = 19.98 +/- 0.03 mag\n\nWe thank Ben Shafransky and the Lowell Observatory staff for their support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35099.",
"published": "2023-11-18T17:18:59.723992Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T17:18:59.724018Z",
"modified": "2023-11-18T17:18:59.731274Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4786,
"topic": "gcn.circular",
"uuid": "05191ade-7de7-4ad8-a497-06d8c8d6579c",
"title": "GRB 231118A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/11/18 17:27:02 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35100"
},
"title": "GCN CIRCULAR",
"number": "35100",
"subject": "GRB 231118A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 17:16:29 UT on 18 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231118A (trigger 722020594.832338 / 231118720).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 4.0, Dec = -48.2 (J2000 degrees, equivalent to J2000 00h 16m, -48d 12'), with a statistical uncertainty of 1.4 degrees.\n\nThe angle from the Fermi LAT boresight is 118.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_skymap_all_bn231118720.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_healpix_all_bn231118720.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118720/quicklook/glg_lc_medres34_bn231118720.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35100.",
"published": "2023-11-18T17:27:12.611454Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T17:27:12.611479Z",
"modified": "2023-11-18T17:27:12.617999Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6393,
"topic": "gcn.circular",
"uuid": "42c291d3-3759-418b-8079-748f755d381d",
"title": "Fermi GRB 240407A: 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": "24/04/07 02:45:42 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36045"
},
"title": "GCN CIRCULAR",
"number": "36045",
"subject": "Fermi GRB 240407A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 240407A ( Fermi GBM team, GCN 36044) errorbox 26 sec after notice time and 73 sec after trigger time at 2024-04-07 01:01:05 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 66 deg. The sun altitude is -18.3 deg.\n\nMASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240407A errorbox 96 sec after notice time and 144 sec after trigger time at 2024-04-07 01:02:16 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 69 deg. The sun altitude is -22.5 deg.\n\nThe galactic latitude b = -15 deg., longitude l = 109 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$16508\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 79 | 2024-04-07 01:01:05 | MASTER-Kislovodsk | (23h 32m 39.83s , +47d 04m 24.7s) | C | 10 | 15.1 |\n 79 | 2024-04-07 01:01:05 | MASTER-Kislovodsk | (23h 38m 18.06s , +46d 40m 40.3s) | C | 10 | 16.3 |\n 109 | 2024-04-07 01:01:05 | MASTER-Kislovodsk | (23h 38m 18.06s , +46d 40m 40.2s) | C | 70 | 17.5 | Coadd\n 114 | 2024-04-07 01:01:36 | MASTER-Kislovodsk | (23h 38m 15.40s , +46d 42m 04.5s) | C | 20 | 16.7 |\n 115 | 2024-04-07 01:01:36 | MASTER-Kislovodsk | (23h 32m 37.08s , +47d 05m 49.7s) | C | 20 | 15.5 |\n 140 | 2024-04-07 01:01:36 | MASTER-Kislovodsk | (23h 32m 37.08s , +47d 05m 49.7s) | C | 70 | 16.0 | Coadd\n 159 | 2024-04-07 01:02:16 | MASTER-Tavrida | (23h 35m 26.07s , +47d 13m 42.4s) | C | 30 | 17.7 |\n 166 | 2024-04-07 01:02:22 | MASTER-Kislovodsk | (23h 34m 12.10s , +44d 47m 19.9s) | P| | 30 | 16.3 |\n 205 | 2024-04-07 01:02:56 | MASTER-Tavrida | (23h 25m 50.18s , +44d 56m 12.4s) | C | 40 | 18.2 |\n 221 | 2024-04-07 01:03:13 | MASTER-Kislovodsk | (23h 38m 21.46s , +46d 42m 31.3s) | C | 40 | 17.2 |\n 221 | 2024-04-07 01:03:13 | MASTER-Kislovodsk | (23h 32m 42.10s , +47d 06m 14.2s) | C | 40 | 15.6 |\n 287 | 2024-04-07 01:04:13 | MASTER-Kislovodsk | (23h 38m 15.32s , +46d 41m 33.6s) | C | 50 | 17.2 |\n 287 | 2024-04-07 01:04:13 | MASTER-Kislovodsk | (23h 32m 36.04s , +47d 05m 16.4s) | C | 50 | 15.6 |\n 363 | 2024-04-07 01:05:25 | MASTER-Kislovodsk | (23h 38m 15.55s , +46d 42m 33.8s) | C | 60 | 17.4 |\n 363 | 2024-04-07 01:05:25 | MASTER-Kislovodsk | (23h 32m 36.12s , +47d 06m 17.0s) | C | 60 | 16.0 |\n 821 | 2024-04-07 01:12:17 | MASTER-Tavrida | (23h 25m 56.16s , +44d 55m 51.6s) | C | 150 | 19.1 |\n 1580 | 2024-04-07 01:25:41 | MASTER-Kislovodsk | (23h 35m 57.51s , +44d 57m 58.9s) | C | 60 | 16.1 |\n 1580 | 2024-04-07 01:25:41 | MASTER-Kislovodsk | (23h 41m 24.62s , +44d 33m 59.5s) | C | 60 | 17.2 |\n 1660 | 2024-04-07 01:27:01 | MASTER-Kislovodsk | (23h 32m 48.85s , +43d 03m 11.1s) | C | 60 | 15.9 |\n 1660 | 2024-04-07 01:27:01 | MASTER-Kislovodsk | (23h 38m 05.44s , +42d 39m 11.0s) | C | 60 | 17.0 |\n 1741 | 2024-04-07 01:28:22 | MASTER-Kislovodsk | (23h 18m 29.88s , +46d 52m 36.1s) | C | 60 | 16.2 |\n 1741 | 2024-04-07 01:28:22 | MASTER-Kislovodsk | (23h 24m 09.97s , +46d 28m 38.3s) | C | 60 | 17.2 |\n 1821 | 2024-04-07 01:29:42 | MASTER-Kislovodsk | (23h 14m 29.30s , +44d 57m 47.8s) | C | 60 | 16.0 |\n 1821 | 2024-04-07 01:29:42 | MASTER-Kislovodsk | (23h 19m 57.98s , +44d 33m 52.2s) | C | 60 | 17.2 |\n 1901 | 2024-04-07 01:31:02 | MASTER-Kislovodsk | (23h 40m 42.22s , +46d 49m 58.8s) | C | 60 | 15.7 |\n 1901 | 2024-04-07 01:31:02 | MASTER-Kislovodsk | (23h 46m 20.74s , +46d 25m 54.7s) | C | 60 | 16.8 |\n 1981 | 2024-04-07 01:32:23 | MASTER-Kislovodsk | (23h 12m 09.93s , +43d 03m 11.9s) | C | 60 | 15.9 |\n 1981 | 2024-04-07 01:32:23 | MASTER-Kislovodsk | (23h 17m 28.24s , +42d 39m 17.9s) | C | 60 | 17.0 |\n 2062 | 2024-04-07 01:33:43 | MASTER-Kislovodsk | (23h 30m 24.58s , +48d 22m 17.6s) | C | 60 | 16.5 |\n 2463 | 2024-04-07 01:40:24 | MASTER-Kislovodsk | (23h 35m 56.74s , +44d 57m 25.5s) | C | 60 | 15.1 |\n 2463 | 2024-04-07 01:40:24 | MASTER-Kislovodsk | (23h 41m 24.46s , +44d 33m 25.3s) | C | 60 | 16.2 |\n 2623 | 2024-04-07 01:43:04 | MASTER-Kislovodsk | (23h 32m 55.39s , +43d 02m 46.5s) | C | 60 | 15.0 |\n 2623 | 2024-04-07 01:43:04 | MASTER-Kislovodsk | (23h 38m 12.58s , +42d 38m 48.4s) | C | 60 | 16.0 |\n 2703 | 2024-04-07 01:44:25 | MASTER-Kislovodsk | (23h 18m 31.66s , +46d 52m 37.3s) | C | 60 | 14.9 |\n 2703 | 2024-04-07 01:44:25 | MASTER-Kislovodsk | (23h 24m 12.78s , +46d 28m 40.9s) | C | 60 | 16.0 |\n 2784 | 2024-04-07 01:45:45 | MASTER-Kislovodsk | (23h 14m 27.19s , +44d 57m 14.5s) | C | 60 | 14.1 |\n 2784 | 2024-04-07 01:45:45 | MASTER-Kislovodsk | (23h 19m 55.94s , +44d 33m 21.2s) | C | 60 | 15.9 |\n 2864 | 2024-04-07 01:47:05 | MASTER-Kislovodsk | (23h 46m 27.01s , +46d 28m 03.3s) | C | 60 | 15.5 |\n 2944 | 2024-04-07 01:48:25 | MASTER-Kislovodsk | (23h 17m 21.90s , +42d 40m 35.5s) | C | 60 | 15.5 |\n 3024 | 2024-04-07 01:49:46 | MASTER-Kislovodsk | (23h 30m 22.68s , +48d 23m 01.0s) | C | 60 | 15.2 |\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/36045.",
"published": "2024-04-07T02:45:58.499557Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-07T02:45:58.499587Z",
"modified": "2024-04-07T02:45:58.508122Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4787,
"topic": "gcn.circular",
"uuid": "c302a4ba-a433-4f46-8886-c7680f2c6dce",
"title": "GRB 231118A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/11/18 17:31:56 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35101"
},
"title": "GCN CIRCULAR",
"number": "35101",
"subject": "GRB 231118A: Swift detection of a burst"
},
"message_text": "\nS. Laha (GSFC/UMBC), M. Ferro (INAF-OAB), C. Gronwall (PSU),\nM. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII), T. Sbarrato (INAF-OAB),\nM. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 17:16:33 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231118A (trigger\u001197311). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 4.843, -48.035 which is\n RA(J2000) = 00h 19m 22s\n Dec(J2000) = -48d 02' 07\"\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 15 sec. The peak count rate\nwas ~11,000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nDue to a telemetry outage, XRT and UVOT data are not\nimmediately available and will be reported later.\n\nBurst Advocate for this burst is S. Laha (sib.laha 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/35101.",
"published": "2023-11-18T17:32:04.106346Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T17:32:04.106380Z",
"modified": "2023-11-18T17:32:04.112624Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4788,
"topic": "gcn.circular",
"uuid": "a4d10994-4176-4ae4-8934-dbabd8815ab9",
"title": "GRB 231117A: SOAR/Goodman imaging of the afterglow",
"submitter": "Hop gcn.circular",
"authors": "Charles Kilpatrick at Northwestern U <ckilpatrick@northwestern.edu>",
"data": {
"date": "23/11/18 18:06:31 GMT",
"from": "Charles Kilpatrick at Northwestern U <ckilpatrick@northwestern.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35102"
},
"title": "GCN CIRCULAR",
"number": "35102",
"subject": "GRB 231117A: SOAR/Goodman imaging of the afterglow"
},
"message_text": "C. D. Kilpatrick (Northwestern), L. Santana (CBPF), R. Salinas (ULS), C. Briceño (NOIRLab/CTIO), C. Fuentes (PUC), C. Bom, A. Santos (CBPF) report on behalf of a larger collaboration:\n\nâWe observed the putative host galaxy of GRB 231117A (Laha et al., GCN 30571, Navaneeth et al., GCN 35072, Cattaneo et al., GCN 35075, Svinkin et al., GCN 35079, Cheung et al., GCN 35081, Odeh et al., GCN 35084, D'Avanzo et al., GCN 35086, Rastinejad et al., GCN 35087, Gompertz et al., GCN 35088) with the Goodman High-Throughput Spectrograph mounted on the SOAR 4m telescope on Cerro Pachon, Chile. We obtained 5x200s of imaging in r-band starting at 2023 Nov 18.03.\n\nWe detect a r=20.4+/-0.1 mag counterpart at the location of SDSS J220933.34+133119.5, consistent with the reported afterglow position reported by Yang et al. (GCN 35083) and subsequent detections of the putative afterglow (Rastinejad et al., GCN 35087, Gompertz & Ackley, GCN 35088, Kumar et al., GCN 35089, Andreoni et al., GCN 35099). These data are on the AB magnitude system and not corrected for Galactic extinction, however we caution that these data are preliminary and there is uncertain contribution from the host galaxy in our aperture. Additional SOAR follow up is planned.â\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35102.",
"published": "2023-11-18T18:08:15.885877Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T18:08:15.885905Z",
"modified": "2023-11-18T18:08:15.893815Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4791,
"topic": "gcn.circular",
"uuid": "077f86f5-b2ce-43e5-9a89-cbf381e10252",
"title": "GRB 231118A: Skynet Optical Afterglow Discovery",
"submitter": "Hop gcn.circular",
"authors": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"data": {
"date": "23/11/18 18:45:17 GMT",
"from": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35103"
},
"title": "GCN CIRCULAR",
"number": "35103",
"subject": "GRB 231118A: Skynet Optical Afterglow Discovery"
},
"message_text": "Dylan Dutton, Megan Dubay, Donovan Schlekat, Logan Selph, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daryl Janzen, Arie Verveer, John Kennewell, and Ruide Fu report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.\n\nWe observed the field of GRB 231118A with our 0.4m robotic telecope located in Meckering, Australia. The observation began at 17:19:11 UTC on Nov 18 2023, approximately 3 minutes after the trigger.\n\nWe obtained multiple expsoures in the B, V, R, and I filters. Exposure lengths were calculated using our automated exposure length scaling model.\n\nWe detected a bright object within the uncertainty radius of the Swift localization, at:\nR.A. (J2000): 00:19:19.3583\nDec. (J2000): -48:02:24.923\n\nWe report the discovery photometry below.\n\nExpLen | Filter | Mag | Date | UTC\n-----------------------------------------\n3.034s | R | 14.8 | Nov 18, 2023 | 17:19:30\n\nOur images have been calibrated using stars from the APASS catalog.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35103.",
"published": "2023-11-18T18:45:28.803141Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T18:45:28.803163Z",
"modified": "2023-11-18T18:45:28.809798Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4792,
"topic": "gcn.circular",
"uuid": "6adb21a8-002d-498f-8226-953a2406a573",
"title": "GRB 231118A: Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/11/18 18:45:21 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35104"
},
"title": "GCN CIRCULAR",
"number": "35104",
"subject": "GRB 231118A: Swift-XRT position"
},
"message_text": "K.L. Page and P.A. Evens (U. Leicester) report on behalf of the Swift-XRT\nteam:\n\nUsing promptly downlinked data we find an uncatalogued X-ray source\nlocated at RA,Dec = 4.8314, -48.0390 which is equivalent to:\n\nRA (J2000.0) = 00 19 19.65\nDEC (J2000.0) = -48 02 20.8\n\nwith an uncertainty of 3.50 arcsec (radius, 90% containment).\nThis location is 31.4 arcsec from the BAT position, inside the BAT\nerror circle.\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/35104.",
"published": "2023-11-18T18:45:32.822181Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T18:45:32.822205Z",
"modified": "2023-11-18T18:45:32.828369Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4795,
"topic": "gcn.circular",
"uuid": "51e75568-e517-4b44-ae5c-13f0a67dfef0",
"title": "GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band",
"submitter": "Hop gcn.circular",
"authors": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"data": {
"date": "23/11/18 19:16:48 GMT",
"from": "Ting-Wan Chen at MPE <janet.chen@astro.su.se>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35105"
},
"title": "GCN CIRCULAR",
"number": "35105",
"subject": "GRB 231117A: Kinder observations with Lulin observatory for AT 2023yba without fading in r band"
},
"message_text": "T.-W. Chen (NCUIA), S. Yang (HNAS), C.-S. Lin (NCUIA), S. Smartt (Oxford/QUB), M. Fraser (UCD), A.J. Levan (Radboud), M.-H. Lee, C.-C. Ngeow, Y.-C. Pan, H.-Y. Hsiao, W.-J. Hou, J.-K. Guo (NCUIA), Z.-N. Wang (HNAS), J. Gillanders (Oxford), M. Fulton, S. Srivastav, T. Moore, C. Angus, A. Aamer (QUB), and N. Tanvir (Leicester) report:\n\nWe observed the field of GRB 231117A (Laha et al., GCN 35071; Navaneeth et al., GCN 35072; Beardmore et al., GCN 35074; Cattaneo et al., GCN 35075; Svinkin et al., GCN 35079; Cheung et al., GCN 35081; Dafcikova et al. GCN 35095).\n\nThe afterglow candidate was initially identified in our previous report (Yang et al., GCN 35083) . Since it is a real astrophysical transient, but not yet confirmed as the afterglow, we registered it as AT2023yba (Chen et al., TNS 194096).\n\nWe used the 40cm SLT at Lulin Observatory, Taiwan to obtain r-band images of the field of GRB 231117A, as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The first SLT epoch of observations started at 10:51 UT on 18 of November 2023 (MJD = 60266.452), 1.32 days after the Swift trigger. The r-band images were combined from 21 frames with a 300-second exposure time for the r band, taken under seeing conditions of an average of 1\".87 and at a median airmass of 1.16. Then we continuously conducted observations of i, g, and z-band images, commencing from MJD = 60266.552, under seeing conditions of an average of 1\".94 and at a median airmass of 1.83.\n\nWe used the Kinder pipeline (Yang et al. A&A 646, A22) to measure the PSF photometry of AT 2023yba after template subtraction using the SDSS images. We obtained the following magnitudes and a 3-sigma detection limit (in the AB system):\n\nr = 20.86 +/- 0.13 mag (exposure time of 300sec*21),\ni = 20.94 +/- 0.17 mag (300sec*6),\ng = 21.37 +/- 0.13 mag (300sec*6) and\nz > 20.02 mag (300sec*6).\n\nThe given magnitudes derived based on calibrating against SDSS field stars and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.06 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\nSince the various GCNs on this source have heterogeneous methods, we focus on comparing our own nightly template subtracted measurements. By comparing these data with measurements on MJD = 60265.435 (at the epoch of 7.39 hours after the Swift trigger), we found AT 2023yba has faded by more than 0.4 mag in g and i bands in one day, but no fading in the r band. No fading in r band was also noticed in Kumar et al. (GCN 35089) at the epoch of 10.56 hours. The redshift of the host galaxy, SDSS J220933.34+133119.5, has been spectroscopically confirmed at z = 0.257 (Ahumada et al., GCN 35093; Gonzalez-Bañuelos et al., GCN 35098), placing this transient at absolute magnitude M_r = -19.6 mag.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35105.",
"published": "2023-11-18T19:16:59.236711Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T19:16:59.236734Z",
"modified": "2023-11-18T19:16:59.245869Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4796,
"topic": "gcn.circular",
"uuid": "fe5feb2c-c05b-48ca-9344-459b63678d96",
"title": "GRB 231118A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/18 20:12:11 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35106"
},
"title": "GCN CIRCULAR",
"number": "35106",
"subject": "GRB 231118A: Enhanced Swift-XRT position"
},
"message_text": "P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 539 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 231118A, 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 = 4.83131, -48.03940 which is equivalent\nto:\n\nRA (J2000): 00h 19m 19.51s\nDec (J2000): -48d 02' 21.8\"\n\nwith an uncertainty of 2.2 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35106.",
"published": "2023-11-18T20:12:23.014354Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T20:12:23.014375Z",
"modified": "2023-11-18T20:12:23.022856Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4798,
"topic": "gcn.circular",
"uuid": "a5f20e20-a0e5-420e-9672-a24449d7dd44",
"title": "GRB 231118A: MASTER OT observation",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/18 22:10:51 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35109"
},
"title": "GCN CIRCULAR",
"number": "35109",
"subject": "GRB 231118A: MASTER OT observation"
},
"message_text": "\nV.Lipunov (Lomonosov MSU), D.Buckley (SAAO),\nA.Kuznetsov, D.Vlasenko, P.Balanutsa, K.Zhirkov, E.Gorbovskoy, Ya.Kechin, Yu.Tselik,\nN.Tiurina, I.Gorbunov, V.Vladimirov, D.Zimnukhov, V.Senik, V.Topolev, A.Yudin,\nA.Chasovnikov, D.Cheryasov, A.Sosnovskij, A.Pozdnyakov, M.Gulyaev (Lomonosov MSU,SAI,PhysicsDepartment),\nO.A. Gres, N.M. Budnev (Irkutsk State University, API),\nR. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),\nR. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\n\nMASTER Global robotic net (MASTER-Net:http://observ.pereplet.ru Lipunov etal.,2010,Advances in Astronomy,2010,30L)\nstarted Fermi (GCN 35100) and\nSwift (Evans et al. GCN 35101, GCN 35104, GCN 35106) GRB 231118A error box observation at 2023-11-18 20:19:50 UT by MASTER-SAAO (Lipunov et al. GCN 35107).\n\nThere is optical counterpart MASTER OT J001919.45-480224.7\n with m_OT\u0019.2m+-0.2m at 2023-11-18 20:26:40 and next 5 expositions (automatic, unfiltered, mlim\u0019.5), at Skynet position (discovered by Dutton et al. GCN 35103, GCN 35108)\n\nObservations started at 70deg.altitude.\n\nObservation and reduction will be continued.\n\n\n\n\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35109.",
"published": "2023-11-18T22:11:00.917002Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T22:11:00.917100Z",
"modified": "2023-11-18T22:11:00.923725Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4799,
"topic": "gcn.circular",
"uuid": "46f7150e-54be-4b91-93db-06f9a2f86c11",
"title": "GRB 231118A: LCOGT Optical Observations",
"submitter": "Hop gcn.circular",
"authors": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"data": {
"date": "23/11/18 22:32:28 GMT",
"from": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35110"
},
"title": "GCN CIRCULAR",
"number": "35110",
"subject": "GRB 231118A: LCOGT Optical Observations"
},
"message_text": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift/Fermi GRB 231118A field (Fermi GBM Team, GCN 35100; Laha et al., GCN 35101) with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on November 18, from 21:20 to 21:52 UT (corresponding to 4.07 to 4.60 hours from the GRB trigger time) with the Bessel R and I filters.\n\nWe performed a series of 3x300s exposures in each band. We detect an uncataloged source consistent with the Skynet afterglow candidate (Dutton et al., GCN 35103) in both bands. This result is consistent with fading detected in continued Skynet observations (Dutton et al., GCN 35108) and MASTER observations (Lipunov, et al., GCN 35109)\n\nThe following magnitudes are calculated using the USNO-B1.0 catalog as reference:\n\nR = 19.08 +/- 0.04\nI = 18.67 +/- 0.03\n\nThese magnitudes are not corrected for galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35110.",
"published": "2023-11-18T22:32:39.049325Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T22:32:39.049345Z",
"modified": "2023-11-18T22:32:39.055865Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4800,
"topic": "gcn.circular",
"uuid": "4f8e4487-2360-41ac-9039-9b22a15b61ab",
"title": "GRB 231118B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/11/18 22:44:35 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35111"
},
"title": "GCN CIRCULAR",
"number": "35111",
"subject": "GRB 231118B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 22:34:14 UT on 18 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231118B (trigger 722039659.86232 / 231118940).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 348.9, Dec = 33.6 (J2000 degrees, equivalent to J2000 23h 15m, 33d 36'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 83.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118940/quicklook/glg_skymap_all_bn231118940.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118940/quicklook/glg_healpix_all_bn231118940.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231118940/quicklook/glg_lc_medres34_bn231118940.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35111.",
"published": "2023-11-18T22:44:45.289419Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T22:44:45.289443Z",
"modified": "2023-11-18T22:44:45.296428Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4801,
"topic": "gcn.circular",
"uuid": "739b072d-751f-484c-acff-c28f447c7af6",
"title": "GRB 231118B: BALROG localization (Fermi Trigger 722039659 / GRB 231118940)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "23/11/18 23:42:44 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35112"
},
"title": "GCN CIRCULAR",
"number": "35112",
"subject": "GRB 231118B: BALROG localization (Fermi Trigger 722039659 / GRB 231118940)"
},
"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\n722039659 at 22:34:14 on 18 Nov. 2023 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) = 346.7+/-0.8 deg\nDecl.(2000.0) = 33.9+/-1.2 deg\nWe estimate an additional systematic error of 2 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB231118940/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB231118940/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB231118940/json\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35112.",
"published": "2023-11-18T23:42:55.035030Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-18T23:42:55.035052Z",
"modified": "2023-11-18T23:42:55.041614Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4802,
"topic": "gcn.circular",
"uuid": "33573202-42bc-46dd-b9ba-3581517a78f2",
"title": "GRB 231118A: Las Cumbres optical detection",
"submitter": "Hop gcn.circular",
"authors": "Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>",
"data": {
"date": "23/11/19 00:04:57 GMT",
"from": "Manisha Shrestha at University of Arizona <mshrestha1@arizona.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35113"
},
"title": "GCN CIRCULAR",
"number": "35113",
"subject": "GRB 231118A: Las Cumbres optical detection"
},
"message_text": "M. Shrestha (Univ. of Arizona), D. Sand (Univ. of Arizona), K. D. Alexander (Univ. of Arizona), J. Andrews (Gemini), J. Pearson (Univ. of Arizona), N. Smith (Univ. of Arizona), K. Bostroem (Univ. of Arizona) D. A. Howell (LCO/UCSB), C. McCully (LCO/UCSB), M. Newsome (LCO/UCSB), E Padilla Gonzalez (LCO/UCSB), C. Pellegrino (LCO/UCSB), G. Terreran (LCO/UCSB), J. Farah (LCO/UCSB) report on behalf of a wider Global Supernova Project collaboration:\n\nWe observed the field of GRB 231118A (Fermi GBM team GCN 34937, Swift GCN 34938) with the 1-m telescope, on 2023-11-18T22:30:11.370 UT (60266.937 MJD, ~5.3 hours after the trigger) using the Sinistro instrument in g, r, i bands. We detect the GRB with the following magnitude:\ng = 19.81 +-0.09\nr = 19.45 +-0.14\ni = 19.44 +-0.19\n\nMagnitudes were calculated with respect to ATLAS-REFCAT2 (Tonry et al. 2018, ApJ 867 105) catalog and are not corrected for galactic extinction. These values are consistent with other detections (Dutton et al., GCN 35103, Dutton et al., GCN 35108, Lipunov et al., GCN 35109, Strausbaugh et al., GCN 35110)\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35113.",
"published": "2023-11-19T00:05:07.387968Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T00:05:07.388001Z",
"modified": "2023-11-19T00:05:07.395391Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4803,
"topic": "gcn.circular",
"uuid": "88ce7d98-65ba-4e3d-acbc-0b243735e115",
"title": "GRB 231117A: 10 GHz VLA detection",
"submitter": "Hop gcn.circular",
"authors": "Genevieve Schroeder at Northwestern University <genevieveschroeder2023@u.northwestern.edu>",
"data": {
"date": "23/11/19 03:49:13 GMT",
"from": "Genevieve Schroeder at Northwestern University <genevieveschroeder2023@u.northwestern.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35114"
},
"title": "GCN CIRCULAR",
"number": "35114",
"subject": "GRB 231117A: 10 GHz VLA detection"
},
"message_text": "G. Schroeder (Northwestern), W. Fong, T. Laskar (Utah) report:\n\n\"We observed the position of the short GRB 231117A (Laha et al., GCN 35071,\nNavaneeth et al., GCN 35072, Cattaneo et al., GCN 35075, Svinkin et al.,\nGCN 35079, Cheung et al., GCN 35081) with the Karl G. Jansky Very Large\nArray (VLA) under program 23A-296 (PI: Schroeder) beginning on 2023 Nov.\n17.98 UT (0.85 days post-burst) for 0.75 hours at a mean frequency of 10\nGHz.\n\nWe confirm the presence of a radio source consistent with the location of\nthe putative optical afterglow and host galaxy (Yang et al. GCN 35083,\nRastinejad et al., GCN 35087, Gompertz & Ackley, GCN 35088, Kumar et al.,\nGCN 35089, Andreoni et al., GCN 35099, Kilpatrick et al., GCN 35102, Chen\net al. 35105). We measure a flux density of ~190 uJy, resulting in a radio\nluminosity of ~4e29 erg/s/Hz, consistent with typical radio luminosities of\nSGRB radio afterglows (Laskar et al. 2022).\n\nOur measured flux density is somewhat fainter than the 9 GHz flux with ATCA\nreported by Rhodes et al. (GCN 35097). While the ATCA observations occurred\nat a slightly earlier mid-time of 0.54 days than our VLA observations, we\ncannot make a strong statistically significant claim regarding fading\nbetween the two observations at this time.\n\nWe thank the VLA staff for quickly approving and executing these\nobservations. Further observations are planned to assess the nature of the\nradio source.\"\nReplyForward\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35114.",
"published": "2023-11-19T03:49:23.784942Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T03:49:23.784962Z",
"modified": "2023-11-19T03:49:23.793964Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4804,
"topic": "gcn.circular",
"uuid": "fe6954c0-7979-484b-82b6-02b6ee85d492",
"title": "GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/11/19 05:41:13 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35115"
},
"title": "GCN CIRCULAR",
"number": "35115",
"subject": "GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor"
},
"message_text": "Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nK. 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),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe CALET Gamma-ray Burst Monitor (CGBM) was operating at\nthe trigger time of the short GRB 231115A\nT0 = 2023-11-15 15:36:21.20 UT (Fermi GCN: #35035, #35044;\nIntegral GCN: #35037; Glowbug GCN #35045; Insight-HXMT/HE GCN\n#35060; Konus-Wind GCN #35062; Swift-BAT GCN #35065).\n\nNo CGBM onboard trigger occurred around T0. Based on the IBAS\nlocalization, the incident angles to HXM and SGM are 79 degrees and\n85 degrees, respectively (#35037). Based on the analysis of the light\ncurve data with 0.125 sec time resolution, we found a hint of the burst\nemission around the trigger time in HXM2 and SGM data. However, the\nsignificance of 4.8 (HXM2) and 4.7 (SGM) sigma is below our detection\ncriterion to the CGBM data.\n\nThe five sigma upper limit of SGM for a 0.125 integration time is\n3.0e-6 erg/cm^2/s (10 - 1000 keV), assuming a power-law with\nan exponential cutoff (alpha = 0.5, Epeak = 580 keV, reference to\n#35044) and the IBAS position.\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/35115.",
"published": "2023-11-19T05:41:23.710390Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T05:41:23.710417Z",
"modified": "2023-11-19T05:41:23.732830Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4805,
"topic": "gcn.circular",
"uuid": "bfba1d03-a361-4008-88da-3e9846d7d9c7",
"title": "GRB 231118A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/11/19 05:42:15 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35116"
},
"title": "GCN CIRCULAR",
"number": "35116",
"subject": "GRB 231118A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 231118A which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35100), and Swift-BAT (Laha et al., GCN Circ. 35101).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-11-18 17:16:33.55 UTC. The measured peak count rate associated with the burst is 773 (+165, -131) counts/s above the background in the combined data of three quadrants (out of four), with a total of 885 (+229, -215) counts. The local mean background count rate was 237 (+5, -8) counts/s. Using cumulative rates, we measure a T90 of 3.9 (+1.6, -1.0) 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 2023-11-18 17:16:32.74 UTC. The measured peak count rate associated with the burst is 638 (+71, -77) counts/s above the background in the combined data of all quadrants, with a total of 1634 (+436, -460) counts. The local mean background count rate was 1222 (+9, -10) counts/s. We measure a T90 of 3.7 (+1.8, -1.3) 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/35116.",
"published": "2023-11-19T05:42:21.807071Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T05:42:21.807093Z",
"modified": "2023-11-19T05:42:21.813504Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4806,
"topic": "gcn.circular",
"uuid": "fc833d53-d55d-4e09-8753-e33a7cabf6ee",
"title": "GRB 231117A: GECAM-C detection",
"submitter": "Hop gcn.circular",
"authors": "Wang-Chen Xue <wcxuemail@gmail.com>",
"data": {
"date": "23/11/19 06:27:53 GMT",
"from": "Wang-Chen Xue <wcxuemail@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35117"
},
"title": "GCN CIRCULAR",
"number": "35117",
"subject": "GRB 231117A: GECAM-C detection"
},
"message_text": "Wang-Chen Xue, Shao-Lin Xiong and Chen-Wei Wang\nreport on behalf of the GECAM team:\n\nGECAM-C was triggered on ground by a short burst, GRB 231117A at\n2023-11-17T03:03:19.210 UTC (denoted as T0), which has been\ndetected by Swift (GCN 35071), AstroSat (GCN 35072), AGILE (GCN 35075),\nKonus-Wind (GCN 35079), Glowbug (GCN 35081), and GRBalpha (GCN 35095).\n\nAccording to the ground data of GECAM-C, this burst mainly consists\nof a short pulse with a duration (T90) of 0.59 +/- 0.04 sec (15-4000 keV).\n\nThe GECAM-C localization is consistent with the Swift/BAT localization\n(GCN 35074) within the error.\n\nThe time-averaged spectrum of GECAM-C data from T0 to T0+1.3 s could be\nadequately fit by a cut-off power-law with photon index alpha of -1.52 (-0.07, +0.09),\nand peak energy Ep of 437 (-174, +556) keV. The corresponding burst fluence is\n8.40 (-1.64, +2.70) * 10^-6 erg/cm^2 in 15-4000 keV.\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\n(GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B)\nlaunched in Dec. 2020. As the third member of GECAM constellation,\nGECAM-C was launched onboard SATech-01 experimental satellite in July 2022.\nGECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35117.",
"published": "2023-11-19T06:28:03.618886Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T06:28:03.618914Z",
"modified": "2023-11-19T06:28:03.628417Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4807,
"topic": "gcn.circular",
"uuid": "33bfd75e-ab42-4abe-a4ac-c4acfb30755d",
"title": "GRB 231117A: AKO Follow-Up Observation",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/11/19 06:50:00 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35118"
},
"title": "GCN CIRCULAR",
"number": "35118",
"subject": "GRB 231117A: AKO Follow-Up Observation"
},
"message_text": "M. Odeh (Al-Khatim Observatory, AKO, operated by the International\nAstronomical Center in Abu Dhabi, UAE) and N. Guessoum, D. Akl and I. Abdi\n(American University of Sharjah, UAE) report:\n\nAs a follow-up to our first observation of GRB 231117A, performed on Nov.\n17, 2023 (GCN 35084 <https://gcn.nasa.gov/circulars/35084>), we again\nobserved the field with our 0.36m f/7.7 robotic telescope, on Nov. 18,\nstarting at 15:50 UT using an (Ic) filter.\n\nWe again detected a faint object at the same location of the source SDSS\nJ220933.34+133119.5 (PS1 ID = 124223323889577032), which is listed in the\nPan-STARRS catalogue with imag = 21.5, and in the SDSS catalogue with imag\n= 20.9. The coordinates of the detected object are: R.A. (2000) =\n22:09:33.36, Dec. (2000) = +13:31:20.1, which is consistent with the\ncoordinates of the candidate optical source reported by Yang et al. (GCN\n35083 <https://gcn.nasa.gov/circulars/35083>).\n\nThe following table summarizes the results of both nights using the Atlas\ncatalogue as a reference:\n---------------------------------------------------------------------------\nObsTime (mid), T(Mid)âT(0), Exposure, Filter, Mag, RMS, Limiting Magnitude\n---------------------------------------------------------------------------\n2023-11-17 15:37:30Z, 12.6 h, 33x180s (stacked), Ic, 19.85, 0.20, 20.2\n2023-11-18 15:50:06Z, 1.53 d, 40x180s (stacked), Ic, 19.78, 0.21, 20.4\n---------------------------------------------------------------------------\nThe magnitudes are not corrected for galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35118.",
"published": "2023-11-19T06:50:10.878180Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T06:50:10.878217Z",
"modified": "2023-11-19T06:50:10.888136Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4810,
"topic": "gcn.circular",
"uuid": "6d03b5fe-9a0d-49b8-8329-b1d7e2ecabf4",
"title": "GRB 231117A: MAAO 0.7-m telescope optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Gu Lim at Pusan National University <lim9gu@gmail.com>",
"data": {
"date": "23/11/19 07:32:15 GMT",
"from": "Gu Lim at Pusan National University <lim9gu@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35119"
},
"title": "GCN CIRCULAR",
"number": "35119",
"subject": "GRB 231117A: MAAO 0.7-m telescope optical upper limit"
},
"message_text": "Lim, Gu (PNU); Park, Junyeong (PNU); Kim, Dohyeong (PNU); Paek, Gregory S. H. (SNU); Im, Myungshin (SNU); Park, Keunhong (MAAO); Choi, Changmin (MAAO); and GECKO Collaboration\n\nWe searched for the optical afterglow of GRB 231117A (S. Laha et al., GCN 35071) with a 0.7m telescope at Miryang Arirang Astronomical Observatory (MAAO), one of the facilities of the GW EM-Counterpart Korean Observatory (GECKO). We started the observation at 2023-11-17 10:04:30 UT and obtained 30 images of each 120s with I-band after 6.9 hours after the Swift detection (GCN 35071). No significant source is found within the updated Swift-XRT position (Beardmore et al. GCN 35074). The photometry is performed using a 2xFWHM diameter aperture. The flux is calibrated using the PanStarrs DR1 photometric catalog (AB system) as a reference. The depth is the limiting magnitude for a point source without the galactic extinction correction.\n\nT0 = 2023-11-17T03:03:19 UT (Laha et al., GCN 35071)\nFilter Mean_Date-obs(UT) exptime(s) T-T0(d) FWHM(\") Depth_3sigma(AB) Depth_5sigma(AB) zp zper\n--------------------------------------------------------------------------------------------------------------------------------------------------\nI 2023-11-17T10:38:14 120x30 +0.32 3.41 >20.34 >19.78 25.99 0.02\n\nOur detection limit is deeper than the report from MITSuME (Takei et al., GCN 35076).\n\nGravitational-wave EM Counterpart Korean Observatory (GECKO) is a network of 10+ 0.4m to 1m class telescopes worldwide.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35119.",
"published": "2023-11-19T07:32:25.730519Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T07:32:25.730540Z",
"modified": "2023-11-19T07:32:25.737646Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4814,
"topic": "gcn.circular",
"uuid": "3df832a1-2f59-4db2-8361-bbea325736fa",
"title": "LIGO/Virgo/KAGRA S231119u: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "valeria.sequino@na.infn.it",
"data": {
"date": "23/11/19 08:26:52 GMT",
"from": "valeria.sequino@na.infn.it",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35120"
},
"title": "GCN CIRCULAR",
"number": "35120",
"subject": "LIGO/Virgo/KAGRA S231119u: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231119u during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-11-19 07:52:48.095 UTC (GPS time: 1384415586.095). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], and SPIIR [4] analysis pipelines.\n\nS231119u is an event of interest because its false alarm rate, as estimated by the online analysis, is 7.4e-08 Hz, or about one in 5 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231119u\n\nThe classification of the GW signal, in order of descending probability, is BBH (95%), Terrestrial (5%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is 4%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 27 seconds after the candidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 4240 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 8237 +/- 2603 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35120.",
"published": "2023-11-19T08:27:03.953186Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T08:27:03.953221Z",
"modified": "2023-11-19T08:27:03.959776Z",
"nonlocalizedevents": [
{
"event_id": "S231119u"
}
],
"targets": []
},
{
"id": 4817,
"topic": "gcn.circular",
"uuid": "db74071e-bc66-463f-8a35-7cb0d680ee87",
"title": "GRB 231117A: Pan-STARRS1 follow-up confirms rapid fading",
"submitter": "Hop gcn.circular",
"authors": "shubhamsrivastav@gmail.com",
"data": {
"date": "23/11/19 11:22:19 GMT",
"from": "shubhamsrivastav@gmail.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35121"
},
"title": "GCN CIRCULAR",
"number": "35121",
"subject": "GRB 231117A: Pan-STARRS1 follow-up confirms rapid fading"
},
"message_text": "M. D. Fulton (QUB), S. Srivastav, S. J. Smartt (Oxford/QUB), J. H. Gillanders (Oxford), K. C. Chambers, M. E. Huber, A. S. B. Schultz (IfA, Hawaii), K. W. Smith, D. R. Young, M. Nicholl, M. McCollum, T. Moore, S. Sim, J. Weston, A. Aamer, C. R. Angus, X. Sheng (QUB), P. Ramsden (QUB/Birmingham), L. Shingles (GSI/QUB), J. Sommer (LMU/QUB), H. Stevance, L. Rhodes, S. Ramaiya, A. Andersson (Oxford), T. de Boer, J. Herman, J. Fairlamb, H. Gao, C. C. Lin, T. Lowe, E. Magnier, P. Minguez, I. A. Smith, R. J. Wainscoat (IfA, Univ. Hawaii), T.-W. Chen (NCU), A. Rest (STScI), C. Stubbs (Harvard) report:\n\nWe observed the field of GRB 231117A (Laha et al., GCN 35071; Navaneeth et al., GCN 35072; Beardmore et al., GCN 35074; Cattaneo et al., GCN 35075; Svinkin et al., GCN 35079; Cheung et al., GCN 35081; Dafcikova et al., GCN 35095) with Pan-STARRS1 (Chambers et al., 2016) on two nights in the grizy filters, with the exposures beginning on MJDs 60266.255617 and 60267.271553.\n\nWe apply the Pan-STARRS1 reference frames for image subtraction and in all exposures, the afterglow candidate identified by Yang et al. (GCN 35083) as AT2023yba is well detected in griz and marginally in y. We confirm a clear and significant fading in all bands in a comparison between the two nights of:\n\ndelta-g = 1.5 +/- 0.2\ndelta-r = 1.3 +/- 0.2\ndelta-i = 1.2 +/- 0.2\ndelta-z = 1.1 +/- 0.2\n\nThe latest r-band magnitude at 60267.282458 is r = 22.0 +/- 0.2. This confirms the fast-fading nature of the optical transient AT2023yba, indicating this optical source, discovered by Yang et al. (GCN 35083), is very likely the afterglow of GRB 231117A.\n\nOperation of the Pan-STARRS1 and Pan-STARRS2 telescopes is primarily supported by the National Aeronautics and Space Administration under Grant No. NNX12AR65G and Grant No. NNX14AM74G issued through the SSO Near-Earth Object Observations Program. Data are processed at Queen's University Belfast enabled through the STFC grants ST/P000312/1 and ST/T000198/1.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35121.",
"published": "2023-11-19T11:22:30.044197Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T11:22:30.044218Z",
"modified": "2023-11-19T11:22:30.061962Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4818,
"topic": "gcn.circular",
"uuid": "ea71f66d-00f1-418a-8c73-94c88c45d28d",
"title": "Fermi trigger No 722039659: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/11/19 13:15:58 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35122"
},
"title": "GCN CIRCULAR",
"number": "35122",
"subject": "Fermi trigger No 722039659: 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 GRB231118.94 (trigger No 722039659,23h 15m 43.20s , +33d 34m 12.0s, R=1) errorbox 43915 sec after notice time and 43950 sec after trigger time at 2023-11-19 10:46:45 UT, with upper limit up to 16.0 mag. Observations started at twilight. The observations began at zenith distance = 26 deg. The sun altitude is -14.1 deg.\n\nThe galactic latitude b = -25 deg., longitude l = 102 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#09534\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 43980 | 2023-11-19 10:46:45 | MASTER-Tunka | (23h 08m 36.60s , +32d 35m 48.9s) | C | 60 | 13.8 |\n 44306 | 2023-11-19 10:52:10 | MASTER-Tunka | (23h 26m 43.12s , +32d 34m 45.4s) | C | 60 | 13.9 |\n 44306 | 2023-11-19 10:52:11 | MASTER-Tunka | (23h 21m 33.77s , +33d 17m 23.2s) | C | 60 | 15.3 |\n 44410 | 2023-11-19 10:53:55 | MASTER-Tunka | (23h 22m 47.51s , +34d 28m 42.3s) | C | 60 | 14.3 |\n 44411 | 2023-11-19 10:53:55 | MASTER-Tunka | (23h 10m 47.58s , +35d 10m 31.4s) | C | 60 | 15.8 |\n 44517 | 2023-11-19 10:55:42 | MASTER-Tunka | (23h 15m 54.74s , +30d 42m 29.0s) | C | 60 | 14.3 |\n 44622 | 2023-11-19 10:57:26 | MASTER-Tunka | (23h 22m 11.17s , +31d 22m 00.6s) | C | 60 | 16.0 |\n 44726 | 2023-11-19 10:59:10 | MASTER-Tunka | (23h 04m 12.19s , +34d 30m 56.6s) | C | 60 | 14.0 |\n 44946 | 2023-11-19 11:02:51 | MASTER-Tunka | (23h 09m 21.27s , +32d 37m 00.0s) | C | 60 | 13.7 |\n 45053 | 2023-11-19 11:04:38 | MASTER-Tunka | (23h 19m 19.45s , +36d 23m 47.2s) | C | 60 | 13.8 |\n 45485 | 2023-11-19 11:11:49 | MASTER-Tunka | (23h 15m 50.25s , +33d 17m 13.6s) | C | 60 | 14.7 |\n 45589 | 2023-11-19 11:13:33 | MASTER-Tunka | (23h 22m 50.89s , +34d 31m 03.5s) | C | 60 | 12.6 |\n 45589 | 2023-11-19 11:13:33 | MASTER-Tunka | (23h 10m 47.02s , +35d 13m 08.6s) | C | 60 | 14.5 |\n 45804 | 2023-11-19 11:17:08 | MASTER-Tunka | (23h 22m 09.74s , +31d 25m 02.8s) | C | 60 | 14.4 |\n 45911 | 2023-11-19 11:18:56 | MASTER-Tunka | (23h 04m 13.27s , +34d 31m 10.7s) | C | 60 | 12.6 |\n 46761 | 2023-11-19 11:33:06 | MASTER-Tunka | (23h 22m 10.92s , +31d 25m 34.8s) | C | 60 | 13.4 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35122.",
"published": "2023-11-19T13:16:08.264701Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T13:16:08.264720Z",
"modified": "2023-11-19T13:16:08.273671Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4823,
"topic": "gcn.circular",
"uuid": "b18d8e8f-305e-4296-8d2f-a9eaf6a5bc4f",
"title": "GRB 231118A: VLT/X-shooter redshift",
"submitter": "Hop gcn.circular",
"authors": "Benjamin Schneider at MIT <bschn@mit.edu>",
"data": {
"date": "23/11/19 14:44:04 GMT",
"from": "Benjamin Schneider at MIT <bschn@mit.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35123"
},
"title": "GCN CIRCULAR",
"number": "35123",
"subject": "GRB 231118A: VLT/X-shooter redshift"
},
"message_text": "B. Schneider (MIT), A. Saccardi (GEPI, Observatoire de Paris), L. Izzo (INAF-Naples & DARK/NBI), A. J. Levan (Radboud), D. B. Malesani (DAWN/NBI), N. R. Tanvir (Univ. Leicester), G. Pugliese (Amsterdam), report on behalf of the Stargate collaboration:\n\nWe observed the field of the Swift/Fermi GRB 231118A (Fermi GBM Team, GCN 35100; Laha et al., GCN 35101) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of\n4 exposures of 600s each. The observation mid-time is 01:23:787 UT on Nov 19 2023 (8.1 hr after the Fermi trigger).\n\nIn a 30s image taken with the acquisition camera on Nov 19 00:51:23 UT, we clearly detect the optical afterglow (Dutton et al., GCN 35103, GCN 35108; Lipunov et al., GCN 35109; Strausbaugh et al., GCN 35110; Shrestha et al, GCN 35113), for which we measure an AB magnitude r = 19.88 +/- 0.04 mag (calibrated against one nearby star from Legacy Survey).\n\nIn a preliminary reduction, we clearly detect a continuum over the entire wavelength range. From detection of multiple absorption features, which we interpret as being due to FeII, MnII, MgII, MgI and FeII*, ZnII, CrII, and CaII, we infer a common redshift of z = 0.8304. We conclude this is the redshift of the burst. We also detect multiple emission lines (Halpha, Hbeta, OIII doublet) at a consistent redshift, which we interpret as being due to the GRB host galaxy. We also note the presence of additional absorption features likely due to multiple intervening systems.\n\nWe acknowledge expert support from the ESO staff in Paranal, in particular Thomas Rivinius and Matias Jones.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35123.",
"published": "2023-11-19T14:44:14.412529Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T14:44:14.412555Z",
"modified": "2023-11-19T14:44:14.421047Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4824,
"topic": "gcn.circular",
"uuid": "2d51e7c2-b8b0-47fa-9d4f-a2be86cf6021",
"title": "GRB 231117A: OHP/T120 optical observations",
"submitter": "Hop gcn.circular",
"authors": "Benjamin Schneider at MIT <bschn@mit.edu>",
"data": {
"date": "23/11/19 14:45:16 GMT",
"from": "Benjamin Schneider at MIT <bschn@mit.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35124"
},
"title": "GCN CIRCULAR",
"number": "35124",
"subject": "GRB 231117A: OHP/T120 optical observations"
},
"message_text": "B. Schneider (MIT), C. Adami (LAM/Pytheas/AMU), D. Turpin (CEA Paris-Saclay), S. Basa (Pytheas/OHP/LAM), Jean Balcaen (Pytheas/OHP), E. Le Floc'h, F. Schüssler (CEA Paris-Saclay), report on behalf of a larger collaboration:\n\nWe observed the field of the short GRB 231117A (Laha et al., GCN 35071; Navaneeth et al. GCN 35072; Cattaneo et al., GCN 35075; Svinkin et al., GCN 35079; Cheung et al., GCN 35081) and its afterglow candidate (Yang et al. GCN 35083; Rastinejad et al., GCN 35087; Gompertz et al., GCN 35088; Kumar et al., GCN 35089; Ahumada et al., GCN 35093; ââRhodes et al., GCN 35097; Andreoni et al., GCN 35099; Kilpatrick et al., GCN 35102) using the T120cm telescope at Observatoire de Haute-Provence (France). A total of 11 exposures of 900 seconds were obtained in the r band at 19:52:31.680 UT on 2023-11-17, ~16.82h after the trigger.\n\nIn the combined frame, we measured a flux excess at the position of SDSS J220933.34+133119.5 compared to archive values. After subtracting the SDSS J220933.34+133119.5 galaxy using the Legacy Survey image, we clearly detect a source consistent with the afterglow candidate reported by Yang et al., GCN 35083.\n\nThe preliminary magnitude derived for that source is\n\nr = 21.0 ± 0.1 mag (AB)\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and magnitudes are not corrected for Galactic extinction.\n\nWe acknowledge the Observatoire de Haute Provence staff for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35124.",
"published": "2023-11-19T14:45:28.516494Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T14:45:28.516514Z",
"modified": "2023-11-19T14:45:28.522582Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4825,
"topic": "gcn.circular",
"uuid": "03cd7085-723a-4194-b125-66b9888d45a0",
"title": "LIGO/Virgo/KAGRA S231119u: One counterpart neutrino candidate from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/11/19 15:31:29 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35125"
},
"title": "GCN CIRCULAR",
"number": "35125",
"subject": "LIGO/Virgo/KAGRA S231119u: One counterpart neutrino candidate from IceCube neutrino searches"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nSearches for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S231119u in a time range of 1000 seconds centered on the alert event time (2023-11-19 07:44:28.000 UTC to 2023-11-19 08:01:08.000 UTC) have been performed [1,2]. During this time period IceCube was collecting good quality data. Two hypothesis tests were conducted. The first search is a maximum likelihood analysis which searches for a generic point-like neutrino source coincident with the given GW skymap. The second uses a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the significance estimate [3].\n\nOne track-like event is found in spatial and temporal coincidence with the gravitational-wave candidate S231119u calculated from the map circulated in the 3-Initial notice. This represents an overall p-value of 0.0061 from the generic transient search and an overall p-value of 0.44 for the Bayesian search. These p-values measure the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not trials corrected for multiple GW events). The most probable multi-messenger source direction based on the neutrinos and GW skymap is RA 237.39, Dec -35.69 degrees.\n\nThe reported p-values can differ due to the estimated distance of the GW candidate. The distance is used as a prior in the Bayesian binary merger search, while it is not taken into account in the generic transient point-like source search. The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. Further details are available at https://gcn.nasa.gov/missions/icecube.\n\nProperties of the coincident events are shown below.\n\n dt(s) RA(deg)\tDec(deg) Angular uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n -286.38 237.38\t-35.65\t\t 0.43\t\t\t0.006\t\t\tnull\n\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n representing 90% CL containment by area.\np-value = the p-value for this specific track event from each search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35125.",
"published": "2023-11-19T15:31:39.125526Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T15:31:39.125546Z",
"modified": "2023-11-19T15:31:39.139867Z",
"nonlocalizedevents": [
{
"event_id": "S231119u"
}
],
"targets": []
},
{
"id": 4860,
"topic": "gcn.circular",
"uuid": "8327265c-805d-448e-a921-82621eb27fca",
"title": "GRB 231117A: AMI-LA radio observations",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/11/20 20:44:23 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35142"
},
"title": "GCN CIRCULAR",
"number": "35142",
"subject": "GRB 231117A: AMI-LA radio observations"
},
"message_text": "Lauren Rhodes, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:\n\nWe observed the field of the afterglow candidate GRB 231117A (GCN 35071) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 15:30:45 on 17-Nov-2023 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J2232+1143 was used as an interleaved complex gain calibrator.\n\nWe do not detect any radio emission at the position of the afterglow candidate as reported in GCN 35083 with a 3-sigma upper limit of 230uJy/beam.\n\nWe thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35142.",
"published": "2023-11-20T20:44:34.435904Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-20T20:44:34.435924Z",
"modified": "2023-11-20T20:44:34.442000Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4826,
"topic": "gcn.circular",
"uuid": "2138a392-216e-423e-bc80-5514f2298a6a",
"title": "GRB 231118A: MeerLICHT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"data": {
"date": "23/11/19 15:33:03 GMT",
"from": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35126"
},
"title": "GCN CIRCULAR",
"number": "35126",
"subject": "GRB 231118A: MeerLICHT afterglow detection"
},
"message_text": "S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO) and P.M. Vreeswijk (Radboud) report on behalf of the MeerLICHT consortium:\n\nThe 0.6 m wide-field MeerLICHT optical telescope located in Sutherland, South Africa, obtained a repeated series of 60 s exposures in the q,u,g,r,i,z bands of GRB 231118A following the Swift detection (Laha et al., GCN 35101). Observations started at 18:58:24 UT on 2023 November 18 (1.7 hours post-trigger) and continued until 21:46:37 UT, following the filter sequence quqgqrqiqz.\n\nWe detect the optical afterglow first reported by Dutton et al. (GCN 35103) with the following AB magnitudes:\n\nq = 17.65 +/- 0.05 at 18:58:56 UT\nu = 18.39 +/- 0.20 at 19:00:35 UT\ng = 18.03 +/- 0.09 at 19:04:08 UT\nr = 17.40 +/- 0.12 at 19:07:43 UT\ni = 17.24 +/- 0.11 at 19:28:53 UT\nz = 17.72 +/- 0.17 at 19:50:19 UT\n\nOur high cadence q-band observations show a power-law decline with temporal index of -1.63, consistent with the decay reported by Dutton et al. (GCN 35108).\n\nMeerLICHT is built and run by a consortium consisting of Radboud University, the University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35126.",
"published": "2023-11-19T15:33:10.256496Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T15:33:10.256515Z",
"modified": "2023-11-19T15:33:10.264230Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4827,
"topic": "gcn.circular",
"uuid": "9e132dac-55a7-4e8a-be1c-2b5cb28c9f72",
"title": "GRB 231118A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/19 19:16:02 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35127"
},
"title": "GCN CIRCULAR",
"number": "35127",
"subject": "GRB 231118A: Swift-XRT refined Analysis"
},
"message_text": "A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB),\nS. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L.\nPage (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 5.0 ks of XRT data for GRB 231118A, from 86 s to 81.5\nks after the BAT trigger. The data comprise 117 s in Windowed Timing\n(WT) mode (the first 9 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=0.84 (+/-0.05), followed by a break at T+8184 s to an\nalpha of 1.6 (+0.4, -0.3).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.36 (+0.14, -0.13). The\nbest-fitting absorption column is 8.6 (+3.4, -2.8) x 10^21 cm^-2, at a\nredshift of 0.8304, in addition to the Galactic value of 1.9 x 10^20\ncm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index\nof 1.51 (+0.13, -0.12) and a best-fitting absorption column of 8.9\n(+2.5, -2.2) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10\nkeV flux conversion factor deduced from this spectrum is 4.8 x 10^-11\n(5.7 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nGalactic foreground: 1.9 x 10^20 cm^-2\nIntrinsic column: 8.9 (+2.5, -2.2) x 10^21 cm^-2 at z=0.8304\nPhoton index:\t 1.51 (+0.13, -0.12)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01197311.\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/35127.",
"published": "2023-11-19T19:16:12.973939Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T19:16:12.973960Z",
"modified": "2023-11-19T19:16:12.982352Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4861,
"topic": "gcn.circular",
"uuid": "aee7bf18-7440-4a7b-b6f3-9c374c36d46e",
"title": "GRB 231118A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/11/20 20:47:21 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35143"
},
"title": "GCN CIRCULAR",
"number": "35143",
"subject": "GRB 231118A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long-duration GRB 231118A (Fermi/GBM detection: GCN 35100; Swift/BAT detection: GCN 35101; AstroSat detection: GCN 35116; Konus/WIND trigger at 2023-11-18 17:16:29.937 UT, INTEGRAL/SPI-ACS peak detection at 2023-11-18 ~17:16:33 UT) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2023-11-18 17:16:34 UTC. The T90 duration is 8 s and the significance during T90 reaches 5.6 sigma.\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB231118A_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35143.",
"published": "2023-11-20T20:47:31.632425Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-20T20:47:31.632442Z",
"modified": "2023-11-20T20:47:31.638765Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4828,
"topic": "gcn.circular",
"uuid": "d4d58d76-8e4a-452a-9732-72519ba46fb9",
"title": "GRB 231117A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/11/19 19:28:53 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35128"
},
"title": "GCN CIRCULAR",
"number": "35128",
"subject": "GRB 231117A: Swift-XRT refined Analysis"
},
"message_text": "A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), J.A. Kennea (PSU), A.\nTohuvavohu (U. Toronto), D.N. Burrows (PSU), A.P. Beardmore (U.\nLeicester), J.P. Osborne (U. Leicester), P. D'Avanzo (INAF-OAB) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 8.8 ks of XRT data for GRB 231117A, from 85 s to 223.3\nks after the BAT trigger. The data comprise 9 s in Windowed Timing\n(WT) mode (taken while Swift was slewing), with the remainder in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=0.65 (+0.07, -0.06).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.81 (+0.17, -0.13). The\nbest-fitting absorption column is consistent with the Galactic value\nof 6.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.6 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 6.1 (+/-3.8) x 10^20 cm^-2\nGalactic foreground: 6.1 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.81 (+0.17, -0.13)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01197027.\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/35128.",
"published": "2023-11-19T19:29:03.325325Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-19T19:29:03.325346Z",
"modified": "2023-11-19T19:29:03.332148Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4829,
"topic": "gcn.circular",
"uuid": "96f2ff38-9c50-4fe0-b788-300fd69a62ab",
"title": "GRB 231120A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/11/20 00:32:39 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35129"
},
"title": "GCN CIRCULAR",
"number": "35129",
"subject": "GRB 231120A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 00:23:08 UT on 20 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231120A (trigger 722132593.748426 / 231120016).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 50.7, Dec = 1.4 (J2000 degrees, equivalent to J2000 03h 22m, 1d 23'), with a statistical uncertainty of 18.2 degrees.\n\nThe angle from the Fermi LAT boresight is 73.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231120016/quicklook/glg_skymap_all_bn231120016.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231120016/quicklook/glg_healpix_all_bn231120016.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231120016/quicklook/glg_lc_medres34_bn231120016.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35129.",
"published": "2023-11-20T00:32:51.212929Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-20T00:32:51.212948Z",
"modified": "2023-11-20T00:32:51.234244Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 4831,
"topic": "gcn.circular",
"uuid": "1a1dedbf-bf94-404a-a1f5-ccc3efaeabe7",
"title": "LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/11/20 02:17:10 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35130"
},
"title": "GCN CIRCULAR",
"number": "35130",
"subject": "LIGO/Virgo/KAGRA S231119ab: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "M. Serino, S. Sugita, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nN. Kawai (RIKEN), H. Negoro, M. Nakajima (Nihon U.),\nT. Mihara (RIKEN),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S231119ab at 2023-11-19 09:38:50 UTC.\n\nAt the trigger time of S231119ab, the high-voltage of MAXI/GSC was off,\nand it was turned on at T0+843 sec (+14.1 min).\nThe first one-orbit (92 min) scan observation with GSC after the event covered 82%\nof the 90% credible region of the cwb skymap from 09:52:55 to 11:03:41 UTC (T0+845 to T0+5091 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35130.",
"published": "2023-11-20T02:17:21.390493Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-11-20T02:17:21.390518Z",
"modified": "2023-11-20T02:17:21.396706Z",
"nonlocalizedevents": [
{
"event_id": "S231119a"
}
],
"targets": []
}
]
}
![http://grb.rssi.ru/GRB231115A/GRB231115A_EHD.png\n\n[1]](http://grb.rssi.ru/GRB231115A/GRB231115A_EHD.png%5Cn%5Cn[1]){kind=link}
