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

[vsnet-grb-info 36408] EP241201a: EP detection of a fast X-ray transient
by GCN Circulars 02 Dec '24

02 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38415 SUBJECT: EP241201a: EP detection of a fast X-ray transient DATE: 24/12/02 07:27:17 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> W. Chen, T. Zhao(NAO,CAS), C. Zhou(HUST), G. Y. Zhao(SYSU), W. D. Zhang(NAO,CAS) report on behalf of the Einstein Probe team: We report the detection of an X-ray transient EP241201a by EP-WXT, which triggered the on-board processing unit at 2024-12-01T21:01:22 (UTC) (trigger ID: 01709126276). We analysed the telemetry data of WXT, and found in the lightcurve a fast X-ray flare that started at 2024-12-01T20:59:16 (UTC) and lasted for about 230 seconds. The position is R.A. = 282.596 deg, DEC = 66.081 deg (J2000) with an uncertainty of about 2.343 arcmin (radius, 90% C.L. statistical and systematic). The average 0.5-4 keV spectrum that was extracted from the time interval of the flare can be fitted with an absorbed power law with a photon index of 3.9(-1.4,+1.6) and a column density of 1.5(-0.6,+0.8)e22 cm^-2. The unabsorbed flux in 0.5-4 keV is 7.1(-4.9,+32.7)e-9 erg/s/cm^2. We plan to perform a target of opportunity observation with the Follow-up X-ray Telescope (FXT) on board EP. Further follow-up observations are encouraged to explore the orgin of EP241201a. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/38415. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36407] The EP-WXT trigger 01709126243 is not a real source
by GCN Circulars 02 Dec '24

02 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38414 SUBJECT: The EP-WXT trigger 01709126243 is not a real source DATE: 24/12/02 01:38:36 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H.-Q. Cheng (NAO, CAS), S. X. Wen (NAO, CAS), A. Li (BNU), H. N. Yang (NAO, CAS), H. W. Pan (NAO, CAS) on behalf of the Einstein Probe team Further analysis of the late arrived telemetry data verifies that the EP-WXT on-board trigger 01709126243 at 2024-12-01T05:24:55 UTC is not a real source. View this GCN Circular online at https://gcn.nasa.gov/circulars/38414. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36406] GRB 241127B: detection of a long GRB by SVOM/ECLAIRs
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38413 SUBJECT: GRB 241127B: detection of a long GRB by SVOM/ECLAIRs DATE: 24/12/01 22:27:09 GMT FROM: miguel.llamas.lanza(a)gmail.com SVOM/ECLAIRs Commissioning Team: Jean-Luc Atteia, Laurent Bouchet, Marius Brunet, Sebastien Guillot, Juliette Alaux, Hui Yang (IRAP), Stéphane Schanne, Damien Turpin, Nicolas Dagoneau, Frédéric Chateau, Hervé Le Provost (CEA), Wenjin Xie, Donghua Zhao (NAOC), Floriane Cangemi (APC), Tais Maiolino (LUPM), Karine Mercier, Marie-Claire Charmeau, Stefano 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), Bing Zhang (UNLV) report on behalf of the SVOM team: During the comissioning phase, the SVOM/ECLAIRs telescope detected and localized a long duration GRB (GRB 241127B) at 2024-11-27T20:56:28.248 UT (Tb) through an offline search with the event-by-event data downloaded through the X-band ground station. The burst was detected by several methods and within several energy ranges and timescales. The best detection is obtained by the Wavelet Count-Rate trigger with a signal-to-noise ratio of 55.5 within 4-120 keV over a time window of 20.48 seconds starting at Tb. The lightcurve shows a slow rise of about 50 seconds and a faster decay of about 20 seconds. The localization of the best Alert is RA, Dec = 10.9757, 17.8559 (J2000).The statistical uncertainty on this position is 1.4 arcminutes, to which we recommend adding 2 arcminutes of systematic uncertainty in quadrature. SVOM did not slew on this burst. The ECLAIRs onboard trigger was not activated at the time of the burst. The burst is also observed in SVOM/GRM. 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. The SVOM point of contact for this burst is: Miguel Llamas Lanza (IRAP) miguel.llamas.lanza(a)irap.omp.eu View this GCN Circular online at https://gcn.nasa.gov/circulars/38413. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36405] GRB241201B: Fermi GBM Final Localization
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38412 SUBJECT: GRB241201B: Fermi GBM Final Localization DATE: 24/12/01 22:15:58 GMT FROM: Bagrat Mailyan at Florida Tech <mbagrat(a)gmail.com> The Fermi GBM team reports the detection of a likely SHORT GRB "At 13:32:00.63 UT on 01 December 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB241201B (trigger 754752725/241201564). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 333.26, Dec = 38.75 (J2000 degrees, equivalent to J2000 22h 13m, +38d 45'), with a statistical uncertainty of 20.18 degrees. The angle from the Fermi LAT boresight is 74 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/38412. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36404] GRB241201B: Fermi GBM Final Localization
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38411 SUBJECT: GRB241201B: Fermi GBM Final Localization DATE: 24/12/01 22:15:15 GMT FROM: Bagrat Mailyan at Florida Tech <mbagrat(a)gmail.com> The Fermi GBM team reports the detection of a likely SHORT GRB "At 13:32:00.63 UT on 01 December 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB241201B (trigger 754752725/241201564). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 333.26, Dec = 38.75 (J2000 degrees, equivalent to J2000 22h 13m, +38d 45'), with a statistical uncertainty of 20.18 degrees. The angle from the Fermi LAT boresight is 74 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241201564/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/38411. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36403] LIGO/Virgo/KAGRA S241201ac: Updated Sky localization
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38410 SUBJECT: LIGO/Virgo/KAGRA S241201ac: Updated Sky localization DATE: 24/12/01 21:50:44 GMT FROM: ethan.payne(a)ligo.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further offline analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S241201ac (GCN Circular 38402). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S241201ac For the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 2300 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 7122 +/- 2366 Mpc (a posteriori mean +/- standard deviation). For 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/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/38410. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36402] EP241126a: SOAR observations of the optical counterpart
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38409 SUBJECT: EP241126a: SOAR observations of the optical counterpart DATE: 24/12/01 21:45:36 GMT FROM: James Freeburn at Swinburne University of Technology <jamesfreeburn54(a)gmail.com> J. Freeburn (Swinburne/OzGrav), I. Andreoni (UNC), J. Carney (UNC) We observed the optical counterpart to the X-ray transient, EP241126a (Hu et al., GCN 38335; Zheng et al., GCN 38339), with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode. We took three 300s exposures in r-band between 2024-11-28T03:48:34 and 2024-11-28T04:07:23 UTC corresponding to ~32 hours after the initial trigger. We detect the optical counterpart associated with EP241126a (Fu et al., GCN 38337; Li et al., GCN 38338; Geng et al., GCN 38357; Qiu et al., GCN 38378; Malesani et al., GCN 38385; Zou, GCN 38404). With photometric calibration using the Pan-STARRS1 catalogue, we measure r= 23.325 +/- 0.090 AB magnitude. View this GCN Circular online at https://gcn.nasa.gov/circulars/38409. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36401] Fermi GRB 241201A: Global MASTER-Net observations report
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38408 SUBJECT: Fermi GRB 241201A: Global MASTER-Net observations report DATE: 24/12/01 20:00:43 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, 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-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 241201A ( Fermi GBM team, GCN 38403) errorbox 14079 sec after notice time and 14110 sec after trigger time at 2024-12-01 18:51:09 UT, with upper limit up to 19.9 mag. The observations began at zenith distance = 79 deg. The sun altitude is -53.3 deg. The galactic latitude b = 63 deg., longitude l = 275 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2691073 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 14141 | 2024-12-01 18:51:09 | MASTER-Tunka | (11h 48m 39.15s , +06d 53m 47.2s) | C | 60 | 19.3 | 14201 | 2024-12-01 18:51:09 | MASTER-Tunka | (11h 48m 39.15s , +06d 53m 47.2s) | C | 180 | 19.8 | Coadd 14579 | 2024-12-01 18:58:27 | MASTER-Tunka | (11h 46m 11.74s , +05d 01m 12.0s) | C | 60 | 19.0 | 14639 | 2024-12-01 18:58:27 | MASTER-Tunka | (11h 46m 11.73s , +05d 01m 12.1s) | C | 180 | 19.6 | Coadd 14728 | 2024-12-01 19:00:56 | MASTER-Tunka | (11h 55m 50.65s , +06d 54m 27.7s) | C | 60 | 19.4 | 14788 | 2024-12-01 19:00:56 | MASTER-Tunka | (11h 55m 50.64s , +06d 54m 27.8s) | C | 180 | 19.8 | Coadd 14956 | 2024-12-01 19:04:45 | MASTER-Tunka | (12h 03m 54.69s , +06d 53m 20.5s) | C | 60 | 19.2 | 15016 | 2024-12-01 19:04:45 | MASTER-Tunka | (12h 03m 54.67s , +06d 53m 20.7s) | C | 180 | 19.8 | Coadd 15029 | 2024-12-01 19:05:58 | MASTER-Tunka | (11h 48m 42.69s , +06d 54m 06.9s) | C | 60 | 19.2 | 15322 | 2024-12-01 19:10:50 | MASTER-Tunka | (11h 46m 08.97s , +05d 00m 58.9s) | C | 60 | 19.4 | 15468 | 2024-12-01 19:13:16 | MASTER-Tunka | (11h 55m 58.43s , +06d 54m 49.9s) | C | 60 | 19.5 | 15541 | 2024-12-01 19:14:30 | MASTER-Tunka | (11h 53m 27.89s , +05d 00m 10.0s) | C | 60 | 19.5 | 15601 | 2024-12-01 19:14:30 | MASTER-Tunka | (11h 53m 27.89s , +05d 00m 09.9s) | C | 180 | 19.9 | Coadd 15613 | 2024-12-01 19:15:41 | MASTER-Tunka | (12h 01m 27.44s , +05d 01m 21.4s) | C | 60 | 19.3 | 15673 | 2024-12-01 19:15:41 | MASTER-Tunka | (12h 01m 27.43s , +05d 01m 21.6s) | C | 180 | 19.9 | Coadd 15685 | 2024-12-01 19:16:53 | MASTER-Tunka | (12h 03m 58.03s , +06d 53m 52.1s) | C | 60 | 19.4 | 16624 | 2024-12-01 19:32:32 | MASTER-Tunka | (11h 46m 08.42s , +05d 02m 28.5s) | C | 60 | 19.3 | 16696 | 2024-12-01 19:33:45 | MASTER-Tunka | (11h 55m 58.00s , +06d 55m 15.8s) | C | 60 | 19.6 | 16769 | 2024-12-01 19:34:57 | MASTER-Tunka | (11h 53m 21.59s , +05d 00m 20.6s) | C | 60 | 19.5 | 16842 | 2024-12-01 19:36:10 | MASTER-Tunka | (12h 01m 30.45s , +05d 00m 28.6s) | C | 60 | 19.3 | 16914 | 2024-12-01 19:37:23 | MASTER-Tunka | (12h 03m 57.99s , +06d 56m 01.3s) | C | 60 | 19.5 | 17358 | 2024-12-01 19:44:46 | MASTER-Tunka | (11h 44m 31.08s , +03d 07m 24.0s) | C | 60 | 19.5 | 17430 | 2024-12-01 19:45:59 | MASTER-Tunka | (11h 53m 27.91s , +05d 02m 25.5s) | C | 60 | 19.6 | 17503 | 2024-12-01 19:47:11 | MASTER-Tunka | (12h 01m 23.85s , +05d 01m 30.2s) | C | 60 | 19.6 | 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/38408. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36400] GRB 241201A: BALROG localization (Fermi Trigger 754757764 / GRB 241201622)
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38407 SUBJECT: GRB 241201A: BALROG localization (Fermi Trigger 754757764 / GRB 241201622) DATE: 24/12/01 17:22:52 GMT FROM: Jochen Greiner at MPE <jcg(a)mpe.mpg.de> T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 754757764 at 14:55:59 on 01 Dec. 2024 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position is: RA(2000.0) = 189.8 deg Decl.(2000.0) = -0.7 deg The 1 sigma statistical error radius is 2.6 deg. We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB241201622/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB241201622/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB241201622/json View this GCN Circular online at https://gcn.nasa.gov/circulars/38407. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36399] GRB 241130A: Fermi GBM Final Real-time Localization
by GCN Circulars 01 Dec '24

01 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38406 SUBJECT: GRB 241130A: Fermi GBM Final Real-time Localization DATE: 24/12/01 17:11:32 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 LONG GRB At 23:13:45 UT on 30 Nov 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241130A (trigger 754701230.37592 / 241130968). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 100.3, Dec = -26.4 (J2000 degrees, equivalent to J2000 06h 41m, -26d 23'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 95.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241130968/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241130968/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241130968/… View this GCN Circular online at https://gcn.nasa.gov/circulars/38406. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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