August 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 35225] GRB 240828A: Fermi-LAT detection
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37331 SUBJECT: GRB 240828A: Fermi-LAT detection DATE: 24/08/29 01:53:02 GMT FROM: Rahul Gupta at NASA GSFC <rahulbhu.c157(a)gmail.com> R. Gupta (NASA GSFC), and N. Di Lalla (Stanford University) report on behalf of the Fermi-LAT Collaboration: On Aug 28, 2024, Fermi-LAT detected high-energy emission from GRB 240828A, which was also detected by Fermi-GBM (trigger 746549711 / 240828622, GCN 37317), and AstroSat CZTI (GCN 37328). The best LAT on-ground … [View More]

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[vsnet-grb-info 35224] GRB 240828A: Tiled Swift observations
by GCN Circulars 29 Aug '24

29 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37330 SUBJECT: GRB 240828A: Tiled Swift observations DATE: 24/08/29 00:55:15 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a series of observations, tiled on the sky, of the Fermi/LAT GRB 240828A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00127 Any uncatalogued X-ray sources detected … [View More]

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[vsnet-grb-info 35223] LAT GRB240828.62: Global MASTER-Net observations report
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37329 SUBJECT: LAT GRB240828.62: Global MASTER-Net observations report DATE: 24/08/28 23:55:48 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, … [View More]Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-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 LAT GRB240828.62 (trigger No 1080646295,15h 01m 58.08s , +36d 38m 27.6s, R=0.300833) errorbox 8021 sec after trigger time at 2024-08-28 17:08:48 UT, with upper limit up to 18.1 mag. Observations started at twilight. The observations began at zenith distance = 75 deg. The sun altitude is -11.1 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the LAT GRB240828.62 errorbox 17444 sec after trigger time at 2024-08-28 19:45:51 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 62 deg. The sun altitude is -30.3 deg. The galactic latitude b = 61 deg., longitude l = 60 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2579813 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 8051 | 2024-08-28 17:08:48 | MASTER-SAAO | (14h 53m 16.72s , +37d 14m 30.3s) | C | 60 | 13.4 | 8552 | 2024-08-28 17:17:08 | MASTER-SAAO | (15h 03m 20.23s , +37d 15m 11.4s) | C | 60 | 17.4 | 9476 | 2024-08-28 17:32:33 | MASTER-SAAO | (14h 53m 14.86s , +37d 15m 50.5s) | C | 60 | 18.0 | 9555 | 2024-08-28 17:33:52 | MASTER-SAAO | (15h 03m 19.09s , +37d 16m 15.9s) | C | 60 | 18.1 | 10458 | 2024-08-28 17:48:54 | MASTER-SAAO | (15h 03m 19.97s , +37d 16m 48.7s) | C | 60 | 18.1 | 11211 | 2024-08-28 18:01:28 | MASTER-SAAO | (15h 00m 13.36s , +35d 22m 55.7s) | C | 60 | 14.0 | 17475 | 2024-08-28 19:45:51 | MASTER-Tavrida | (14h 53m 21.53s , +36d 03m 58.8s) | C | 60 | 18.0 | 18524 | 2024-08-28 20:03:20 | MASTER-Tavrida | (14h 53m 24.35s , +36d 04m 05.1s) | C | 60 | 17.7 | 19572 | 2024-08-28 20:20:48 | MASTER-Tavrida | (14h 53m 27.59s , +36d 03m 37.4s) | C | 60 | 17.8 | 22677 | 2024-08-28 21:12:34 | MASTER-Tavrida | (14h 55m 41.91s , +37d 23m 27.8s) | C | 60 | 17.6 | 23600 | 2024-08-28 21:27:56 | MASTER-Tavrida | (14h 55m 41.63s , +37d 22m 39.0s) | C | 60 | 17.6 | 24533 | 2024-08-28 21:43:29 | MASTER-Tavrida | (14h 55m 46.76s , +37d 23m 38.0s) | C | 60 | 13.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/37329. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 35222] GRB 240828A: AstroSat CZTI detection of a long burst
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37328 SUBJECT: GRB 240828A: AstroSat CZTI detection of a long burst DATE: 24/08/28 21:17:13 GMT FROM: Varun Bhalerao at IIT Bombay <varunb(a)iitb.ac.in> S. Srijan (IITB), G. Waratkar (IITB), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma … [View More]

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[vsnet-grb-info 35221] Fermi GRB 240828A: Bassano Bresciano Observatory upper limit
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37327 SUBJECT: Fermi GRB 240828A: Bassano Bresciano Observatory upper limit DATE: 24/08/28 20:57:33 GMT FROM: Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano(a)gmail.com> U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory), Members of: GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani. AAVSO - American Association of Variable Star Observers. GAC - Gruppo Astrofili Cremonesi. In a large … [View More]

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[vsnet-grb-info 35220] GRB 240825A: Upper limits from a neutrino search with IceCube
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37326 SUBJECT: GRB 240825A: Upper limits from a neutrino search with IceCube DATE: 24/08/28 20:37:55 GMT FROM: Jessie Thwaites at IceCube/U Wisc-Madison <thwaites(a)wisc.edu> The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search for track-like muon neutrino events arriving from the direction of GRB 240825A (GCN Circular 37274 (Swift); 37301 (Fermi-GBM)). The search was performed at the position of the candidate … [View More]

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[vsnet-grb-info 35219] GRB 240819A as a likely X-Ray Flash
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37325 SUBJECT: GRB 240819A as a likely X-Ray Flash DATE: 24/08/28 19:55:10 GMT FROM: sebastien.guillot(a)irap.omp.eu SVOM/ECLAIRs commissioning team: Sebastien Guillot, Olivier Godet, Laurent Bouchet, Juliette Alaux (IRAP), Tais Maiolino (LUPM), Floriane Cangemi (APC), Stéphane Schanne, Frédéric Chateau, Nicolas Dagoneau, Hervé Le Provost (CEA), Karine Mercier, Marie-Claire Charmeau, Stefano Crepaldi (CNES) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (… [View More]CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Jean-Luc Atteia (IRAP), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Bing Zhang (UNLV) report on behalf of the SVOM team: Following the trigger of the X-ray transient, named GRB 240819A, by SVOM/ECLAIRs (Coleiro, et al., GCN 37208) at 2024-08-19T02:35:21.2 UT (T0), further analyses of the X-band data from ECLAIRs indicate a rather soft event with most photons below 40 keV (signal-to-noise of ~10 for events between 4 to 40 keV; versus S/N < 4 for events above 40 keV). In addition, observations by Swift-XRT at T0+0.23 days and T0+0.31 days (D'Avanzo, et al., GCN 37218) and at T0+6.01 days (D’ai, et al. GCN 37311) revealed a fading X-ray source from 11(+3.5, -2.9) x 10^-3 ct/sec to a 3-sigma upper limit of 3.5 x 10^-3 ct/sec. Therefore, the X-ray afterglow of GRB 240819A is likely source 2 (from D’ai, et al. GCN 37311), localized at RA=310.9464 (20:43:47.14) and Dec.=+49.5140 (+49:30:50.3) with a 90% c.l. error circle of 5.8 arcseconds. The identification of the fading afterglow and the spectral softness of the event described above, are indicative of a likely X-Ray Flash (XRF, i.e., a soft GRB with lower luminosity and located at a closer distance than typical GRBs), rather than a Galactic transient. We encourage deep optical follow-up observations to attempt the detection of a possible supernova that could be associated with this event. We caution that, due to the low galactic latitude of the transient, a potential supernova will undergo strong visible extinction (Av ~ 5). View this GCN Circular online at https://gcn.nasa.gov/circulars/37325. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 35218] GRB 240828B: Swift ToO observations
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37324 SUBJECT: GRB 240828B: Swift ToO observations DATE: 24/08/28 18:48:57 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the SVOM/ECLAIRs GRB 240828B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021706 Any uncatalogued X-ray sources detected in this analysis will be reported … [View More]

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[vsnet-grb-info 35217] GRB 240821A: PRIME near-infrared observations
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37323 SUBJECT: GRB 240821A: PRIME near-infrared observations DATE: 24/08/28 16:59:13 GMT FROM: Joe Durbak at UMD <gcn.joedurbak(a)gmail.com> J. Durbak (UMD), E. Troja (U Rome), S. Atri(U Rome), A. S. Kutyrev (NASA/GSFC), O. Guiffreda (UMD), K. De (MIT), S. B. Cenko (NASA/GSFC) Following the SVOM localization (GCN 37220), we observed the field of GRB 240821A in H-band with PRIME ~30 hours after the trigger. The total exposure time was 1800s. At the … [View More]

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[vsnet-grb-info 35216] GRB 240825A: VLA detection
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37322 SUBJECT: GRB 240825A: VLA detection DATE: 24/08/28 16:53:27 GMT FROM: corinna.pena(a)utah.edu C. Peña (University of Utah), T. Laskar (University of Utah), G. Schroeder (Northwestern University), K. D. Alexander (University of Arizona), C. Christy (University of Arizona), E. Berger (Harvard University), R. Chornock (UC Berkeley), W. Fong (Northwestern University), R. Margutti (UC Berkeley), and P. Schady (University of Bath) report on behalf of a … [View More]

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