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

[vsnet-grb-info 36478] GRB 241209A: Prompt enhanced Swift-XRT position
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38479 SUBJECT: GRB 241209A: Prompt enhanced Swift-XRT position DATE: 24/12/09 06:41:12 GMT FROM: K.L. Page at U Leicester <klp5(a)leicester.ac.uk> K.L. Page and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using promptly downlinked XRT event data for GRB 241209A, we find a fading X-ray source with an enhanced position: RA,Dec = 155.39704, 6.32828 (degrees) which is equivalent to: RA (J2000.0) = 10 21 35.29 DEC (J2000.0) = +06 … [View More]

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[vsnet-grb-info 36477] GRB 241209B: SVOM/ECLAIRs and GRM detection of a long burst
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38478 SUBJECT: GRB 241209B: SVOM/ECLAIRs and GRM detection of a long burst DATE: 24/12/09 06:31:34 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> SVOM/ECLAIRs Commissioning Team: Wenjin Xie, Donghua Zhao, Chao Wu (NAOC), Nicolas Dagoneau, Stéphane Schanne, Frédéric Chateau, Hervé Le Provost (CEA), Jean-Luc Atteia, Laurent Bouchet, Marius Brunet, Sebastien Guillot, Juliette Alaux, Hui Yang (IRAP), Alexis Coleiro (APC), Tais Maiolino (LUPM), Karine … [View More]Mercier, Marie-Claire Charmeau, Stefano Crepaldi (CNES) SVOM/GRM team: Chen-Wei Wang, Yue Wang, Wang-Chen Xue, Chao Zheng, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Long Zhang, Wen-Jun Tan, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Qiu Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LUPM), Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jingwei Wang (IAP), JeanLuc Attéia (IRAP) SVOM/MXT Commissioning Team: P. Ferrando, H. Goto, D. Götz, A. Meuris, M. Moita, C. Plasse, A. Sauvageon (CEA), F. Robinet, N. Leroy, C. van Hove (IJCLab), P. Maggi, L. Michel (ObAS), A. Fort, J. Joubert, K. Mercier, S. Crepaldi (CNES) SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Olivier Godet (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), Shao-Lin Xiong (IHEP), Bing Zhang (UNLV) Report on behalf of the SVOM team: During the commissioning phase, the SVOM/ECLAIRs telescope triggered and located the long duration GRB 241209B (sb24120901) at 2024-12-09 03:56:20 UT (Tb) which was also detected by SVOM/GRM. The following ECLAIRs trigger information was received on the ground with low-latency by the SVOM VHF Alert Network. The burst was detected by both the on-board Count-Rate Trigger (CRT) and Image Trigger (IMT) and 13 alerts were received. The best detection is obtained by CRT with a signal-to-noise ratio of 20.01 in the 8-120 keV energy band over a time window of 1.2 s starting at Tb. The light curve shows one main pulse. The burst duration is 3.7 -0.2 / +1.1 s (5-120 keV). The localization of the best alert is RA, Dec = 194.983, 76.222 (J2000). The statistical uncertainty on this position is 4.2 arcminutes, to which we recommend adding 2 arcminutes of systematic uncertainty in quadrature. SVOM/GRM was also triggered in-flight by this burst (SVOM trigger reference: sb24120901) at 2024-12-09T03:56:20.000 UTC (T0). With the VHF data, the GRM light curve shows that this burst consists of one main pulse with a duration of 3.7 +/- 0.7 s (15-550 keV). The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241209B.png SVOM immediately slew to the ECLAIRs error box and MXT started to observe the field of GRB 241209A at 2024-12-09T04:43 UT in an automatic way, about 50 minutes after ECLAIRs detection. The observation start delay is due to Earth occultation. The analysis of the prompt VHF data shows no clear evidence of an afterglow candidate in the MXT data. Further analysis will be done once the X-band telemetry data are received. Observations by other telescopes are encouraged. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by APC, CEA, CNES, and IRAP. GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. MXT was developed jointly by CNES, CEA, IJCLab, University of Leicester and MPE. The SVOM point of contact for this burst is: xiewj(a)bao.ac.cn View this GCN Circular online at https://gcn.nasa.gov/circulars/38478. --- 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 36476] EP241208a: EP detection of a fast X-ray transient
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38477 SUBJECT: EP241208a: EP detection of a fast X-ray transient DATE: 24/12/09 06:10:36 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y. L. Wang (NAO, CAS), Y. Wang (PMO, CAS), H. L. Peng (NNU), W. D. Zhang (NAO,CAS) report on behalf of the Einstein Probe team: We report on the detection of a fast X-ray transient detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP241208a. The transient … [View More]

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[vsnet-grb-info 36475] GRB 241209A: Swift detection of a short burst
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38476 SUBJECT: GRB 241209A: Swift detection of a short burst DATE: 24/12/09 05:56:26 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> T. M. Parsotan (GSFC), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), R. Gupta (NASA GSFC), D. M. Palmer (LANL) and A. Tohuvavohu (Caltech) report on behalf of the Neil Gehrels Swift Observatory Team: At 05:35:44 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241209A (trigger=1273071). … [View More]

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[vsnet-grb-info 36474] GRB 241209A: Swift detection of a short burst
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38476 SUBJECT: GRB 241209A: Swift detection of a short burst DATE: 24/12/09 05:56:26 GMT FROM: David Palmer at LANL <palmer(a)lanl.gov> T. M. Parsotan (GSFC), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), R. Gupta (NASA GSFC), D. M. Palmer (LANL) and A. Tohuvavohu (Caltech) report on behalf of the Neil Gehrels Swift Observatory Team: At 05:35:44 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241209A (trigger=1273071). … [View More]

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[vsnet-grb-info 36473] Swift GRB241209.23: Global MASTER-Net observations report
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38475 SUBJECT: Swift GRB241209.23: Global MASTER-Net observations report DATE: 24/12/09 05:46:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. … [View More]

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[vsnet-grb-info 36472] GRB 241209A: Fermi GBM Final Real-time Localization
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38474 SUBJECT: GRB 241209A: Fermi GBM Final Real-time Localization DATE: 24/12/09 05:46:17 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely SHORT GRB At 05:35:44 UT on 9 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241209A (trigger 755415349.162358 / 241209233). The on-ground calculated location, using the Fermi GBM trigger data, is RA =… [View More]

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[vsnet-grb-info 36471] Fermi GRB 241207B: Global MASTER-Net observations report
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38473 SUBJECT: Fermi GRB 241207B: Global MASTER-Net observations report DATE: 24/12/09 04:30:45 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta,… [View More] R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 241207B ( Fermi GBM team, GCN 38461) errorbox 1 days 24239 sec after notice time and 1 days 24273 sec after trigger time at 2024-12-09 03:35:34 UT, with upper limit up to 17.2 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -15.5 deg. The galactic latitude b = 31 deg., longitude l = 353 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2699915 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 110763 | 2024-12-09 03:35:34 | MASTER-Tavrida | (15h 02m 40.58s , -11d 54m 25.0s) | C | 180 | 16.6 | 110959 | 2024-12-09 03:38:50 | MASTER-Tavrida | (15h 10m 53.06s , -11d 52m 58.7s) | C | 180 | 17.2 | 111160 | 2024-12-09 03:42:12 | MASTER-Tavrida | (15h 02m 36.75s , -11d 53m 42.6s) | C | 180 | 15.2 | 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/38473. --- 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 36470] GRB 241207B: Swift/BAT-GUANO localization skymap of a short burst
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38472 SUBJECT: GRB 241207B: Swift/BAT-GUANO localization skymap of a short burst DATE: 24/12/09 03:53:49 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 241207B onboard (T0: 2024-12-07T20:51:01.75 UTC, Fermi trig 755297466) The Fermi notice, distributed … [View More]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). Upon 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. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 10.3 in a 0.256 s analysis time bin, starting at T0 - 0.128 s. Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2024. in prep) The 90% credible area is 6,453 deg2 and the 50% credible area is 336 deg2. The integrated probability inside the coded field of view is <1%. The NITRATES skymap is consistent with the Fermi localization reported in the final position notice (GCN 38461). The combined Fermi/GBM+NITRATES 90% credible area is 358 deg2 and the 50% credible area is 108 deg2. A plot of the probability skymap can be viewed here: [skymap_plot](https://guano.swift.psu.edu/trigger_report?id=755297496/#:~:te… The probability skymap file can be downloaded from the link here [skymap_fits_file](https://guano.swift.psu.edu/files/755297496/0_n_PROBMAP) Instructions on how to read and manipulate this map can be found here: https://guano.swift.psu.edu/documentation More details about this burst can be found on the trigger report page here: https://guano.swift.psu.edu/trigger_report?id=755297496 GUANO 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. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/38472. --- 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 36469] Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
by GCN Circulars 08 Dec '24

08 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38471 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB DATE: 24/12/08 20:43:36 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 755277791/241207641 at 15:23:06.19 UT on 07 December 2024, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to SGR … [View More]

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