May 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 38470] GRB 250512B: SVOM detection of a burst
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40439 SUBJECT: GRB 250512B: SVOM detection of a burst DATE: 25/05/12 14:40:03 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Pierre Maggi (ObAS), Yinuo Ma (NAOC), Nicolas Dagoneau (CEA), Ulysse Jacob (LUPM), Miguel Moita (CEA) report on behalf of the SVOM mission team: SVOM/ECLAIRs triggered and located GRB 250512B (SVOM burst-id sb25051203) starting at 2025-05-12T11:20:08 (Tb), also detected by Einstein Probe (labelled as EP250512a, Zhao et al. GCN 40437). The following trigger information was received after data download through the X-band ground station. The burst was detected onboard both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 16 alerts. CRT provided the alert with the best signal-to-noise-ratio (SNR) of 25.26 in the 8-120 keV energy band over a time window of 20.40 seconds starting at Tb. The localization of the best alert is R.A., Dec. 215.22, -10.1086 degrees with a 90% confidence level (C.L.) radius of 3.65 arcmin (including systematic error of 2 arcmin added in quadrature). The ECLAIRs light curve in the 4-120 keV energy band shows a single broad peak structure with a T90 duration of 23.76 (-2.50/+0.48) seconds. SVOM slewed to the burst. MXT began observing the field at 2025-05-12T11:22:58.718 UTC, 160 seconds after Tb. Using the X-band data we found an uncatalogued X-ray source located at R.A., Dec. 215.200, -10.1128 degrees: R.A. (J2000) = 14h20m48.1s Dec. (J2000) = -10d06m46.16s with a 90% C.L. radius of 40 arcseconds including 35 arcseconds added in quadrature. This location is 1.2 arcminutes from the ECLAIRs onboard position and 50 arcseconds from the EP/FXT one. The MXT source is rapidly fading and is not detected in the second orbit starting 1.5 hours after slew. VT began observing the field after the slew. The analysis of the recorded images will be published in a future circular gathering information on the follow-up of the SVOM optical instruments. The Space-based multi-band astronomical 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 CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE. The Burst Advocate (BA) on shift for this burst is Pierre Maggi: pierre.maggi(a)astro.unistra.fr. Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/40439. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38469] GRB 250507B: SVOM/GRM observation of a burst
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40438 SUBJECT: GRB 250507B: SVOM/GRM observation of a burst DATE: 25/05/12 14:30:02 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Olivier Godet, Hui Yang (IRAP) report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by a burst GRB 250507B (SVOM trigger reference: sb25050704) at 2025-05-07T09:31:33.2 UTC (T0). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a single pulse with a T90 of 3.5 +0.9/-1.8 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250507B.png ECLAIRs was not collecting data at the time of this burst. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM point of contact for this burst is: Chen-Wei Wang (IHEP)(cwwang(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/40438. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38468] EP250512a: Einstein Probe detection of an X-ray transient
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40437 SUBJECT: EP250512a: Einstein Probe detection of an X-ray transient DATE: 25/05/12 12:13:33 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> D. H. Zhao, M. J. Liu, J. W. Hu, H. W. Pan (NAO, CAS) on behalf of the Einstein Probe (EP) team: We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP250512a. The transient triggered EP-WXT (ID: 01709175718) at 2025-05-12T11:22:08 (UTC). The WXT position of the source is R.A. = 215.216 deg, DEC = -10.092 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic). A follow-up observation with the Follow-up X-ray Telescope (FXT) was performed automatically. Within the WXT error circle, an uncatalogued X-ray source was detected at R.A. = 215.2023 deg, DEC = -10.0988 deg (J2000) with an uncertainty of 20 arcsec in radius (90% C.L. statistical and systematic). Further information will be updated when the telemetry data is received. The contact TA of EP250512a is D. H. Zhao, please contact her via the email zhaodh(a)bao.ac.cn if needed. 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/40437. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38467] GRB 250512A: Fermi GBM Final Real-time Localization
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40436 SUBJECT: GRB 250512A: Fermi GBM Final Real-time Localization DATE: 25/05/12 12:12:11 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 12:01:36 UT on 12 May 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250512A (trigger 768744101.290912 / 250512501). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 318.9, Dec = 76.7 (J2000 degrees, equivalent to J2000 21h 15m, 76d 42'), with a statistical uncertainty of 9.5 degrees. The angle from the Fermi LAT boresight is 104.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250512501/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250512501/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250512501/… View this GCN Circular online at https://gcn.nasa.gov/circulars/40436. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38466] EP250511a: REM optical/NIR observations
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40435 SUBJECT: EP250511a: REM optical/NIR observations DATE: 25/05/12 09:02:36 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R. Brivio, M. Ferro, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB EP250511a detected by EP/WXT (Lian et al., GCN 40429) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, and K bands, started on 2025 May 11 at 22:53:26 UT (i.e. 14.9 hr after the burst), and lasted for about 1 hour. From preliminary inspection, we do not detect any possible counterpart consistent with the candidate optical afterglow (Schneider et al., GCN 40431; Li et al., GCN 40433) down to the following 3sigma limits: r > 19.4 (AB; calibrated against the Pan-STARRS catalogue), at a mid-time of 15.3 hr after the trigger; H > 16.2 (Vega; calibrated against the 2MASS catalogue), at a mid-time of 15.0 hr after the trigger. View this GCN Circular online at https://gcn.nasa.gov/circulars/40435. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38465] EP250511a: Einstein Probe follow-up obsevation and refined analysis
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40434 SUBJECT: EP250511a: Einstein Probe follow-up obsevation and refined analysis DATE: 25/05/12 06:36:55 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> A. Li (BNU), Y. L. Wang (NAO, CAS), T. Y. Lian (NAO, CAS), C. C. Jin (NAO, CAS) behalf of the Einstein Probe (EP) team: The X-ray transient EP250511a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Lian et al., GCN 40429), and followed up by several telescopes (Perez-Garcia et al, GCN 40430; Schneider et al, GCN 40431; Lipunov et al, GCN 40432; Li et al, GCN 40433). Refined analysis of the WXT data shows that the event started at T0=2025-05-11T07:59:59 (UTC) and lasted for about 50s. The peak flux is about 3.8 x 10^(-9) erg/s/cm^2. The averaged 0.5-4 keV spectrum can be fitted by an absorbed power law model with a fixed Galactic hydrogen column density of 2.7 x 10^20 cm^-2 and a photon index of 2.17 (+/-0.71). The derived average unabsorbed 0.5-4 keV flux is 2.3 (-0.8/+0.6) x 10^(-10) erg/s/cm^2. The uncertainties are quoted at the 90% confidence level for the above parameters. The Follow-up X-ray Telescope (FXT) on board EP observed this source autonomously about 3 min after T0, starting at 2025-05-11T08:03:06 (UTC). Within the WXT error circle, on-ground analysis of the FXT data found an uncatalogued source at R.A. = 202.1113, DEC = -2.7023 (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The averaged 0.5-10 keV FXT spectrum can be fitted by an absorbed power law model with a fixed Galactic hydrogen column density of 2.7 x 10^20 cm^-2 and a photon index of 2.98 (-0.59/+0.62). The derived average unabsorbed 0.5-10 keV flux is 1.7 (-0.7/+0.9) x 10^(-13) erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. The contact TA of EP250511a is A. Li. Please contact him via email anli(a)mail.bnu.edu.cn if needed. 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/40434. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38464] EP250511a: SVOM/VT optical candidate comfirmation
by GCN Circulars 12 May '25

12 May '25

TITLE: GCN CIRCULAR NUMBER: 40433 SUBJECT: EP250511a: SVOM/VT optical candidate comfirmation DATE: 25/05/12 01:50:53 GMT FROM: Huali Li at at NAOC, SVOM <lhl(a)nao.cas.cn> H. L. Li, L. P. Xin, Y. L. Qiu, J. Wang, C. Wu, Z. H. Yao, Y. N. Ma, X. H. Han, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei, T. Y. Lian (NAOC), A. Li (BNU), Y. L. Wang (NAOC; ICE, CSIC-IEEC), C. C. Jin (NAOC) report on behalf of the SVOM and Einstein Probe (EP) teams: SVOM/VT observed the X-ray transient EP250511a (Lian et al., GCN 40429) in ToO mode in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. The observations started at 2025-05-11T15:46:49 UT, about 7.78 hours after the trigger. The candidate reported by Bchneider et al. (GCN 40431) within the error box of EP/FXT (Lian et al., GCN 40429) was clearly detected by VT in both channels. The brightness of the candidate was derived as below : Mid-time Band mag(AB) exposure 8.16 hour VT_B 22.41 +/- 0.13 36*70 sec 8.14 hour VT_R 22.29 +/- 0.13 36*70 sec 9.77 hour VT_B 22.65 +/- 0.15 37*70 sec 9.78 hour VT_R 22.52 +/- 0.16 37*70 sec Our photometry was estimated in AB magnitude and not corrected for Galactic extinction. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/40433. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38463] EP250511a: Global MASTER-Net observations report
by GCN Circulars 11 May '25

11 May '25

TITLE: GCN CIRCULAR NUMBER: 40432 SUBJECT: EP250511a: Global MASTER-Net observations report DATE: 25/05/11 20:36:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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-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 EP250511a ( EP Team et al., GCN 40429) errorbox 28887 sec after notice time and 44100 sec after trigger time at 2025-05-11 20:14:59 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 30 deg. The sun altitude is -55.6 deg. The galactic latitude b = 58 deg., longitude l = 322 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2867812 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 44115 | 2025-05-11 20:14:59 | MASTER-SAAO | (13h 27m 09.60s , -02d 50m 52.7s) | C | 30 | 16.8 | 44220 | 2025-05-11 20:14:59 | MASTER-SAAO | (13h 27m 09.60s , -02d 50m 52.5s) | C | 240 | 16.8 | Coadd 44165 | 2025-05-11 20:15:48 | MASTER-SAAO | (13h 27m 07.01s , -02d 49m 12.4s) | C | 30 | 16.9 | 44259 | 2025-05-11 20:16:38 | MASTER-SAAO | (13h 27m 08.05s , -02d 50m 48.6s) | C | 120 | 16.7 | 44399 | 2025-05-11 20:18:57 | MASTER-SAAO | (13h 27m 12.36s , -02d 49m 05.6s) | C | 120 | 16.8 | 44538 | 2025-05-11 20:21:16 | MASTER-SAAO | (13h 27m 08.49s , -02d 49m 44.1s) | C | 120 | 16.6 | 44707 | 2025-05-11 20:23:36 | MASTER-SAAO | (13h 27m 08.91s , -02d 48m 40.9s) | C | 180 | 15.3 | 44907 | 2025-05-11 20:26:55 | MASTER-SAAO | (13h 27m 18.75s , -02d 49m 37.8s) | C | 180 | 16.1 | 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/40432. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38462] EP250511a: COLIBRÍ optical counterpart candidate
by GCN Circulars 11 May '25

11 May '25

TITLE: GCN CIRCULAR NUMBER: 40431 SUBJECT: EP250511a: COLIBRÍ optical counterpart candidate DATE: 25/05/11 14:01:49 GMT FROM: Benjamin Schneider at MIT <bschn(a)mit.edu> Benjamin Schneider (LAM), Kin Ocelotl López (UNAM), Rosa L. Becerra (U Roma), Camila Angulo (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Alan M. Watson (UNAM), Fredd Alvarez (UNAM), Jean-Luc Atteia (IRAP), Dalya Akl (AUS), Sarah Antier (OCA), Nathaniel R. Butler (ASU) , Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Noémie Globus (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), and Antonio de Ugarte Postigo (LAM): We imaged the field of the EP250511a (Lian et al., GCN Circ. 40429) using the DDRAGO wide-field imager on the COLIBRÍ telescope. We observed from 2025-05-11 09:25:48 to 10:08:02 UTC (from 1.43 to 2.13 hours after the trigger, and 2 minutes after the notice) and obtained 32 minutes of exposure in the i filter. The data were reduced and coadded with the COLIBRÍ pipeline and analyzed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS catalog, is in the AB system, and is not corrected for Galactic extinction. We marginally detect a new source consistent with the FXT position (Lian et al., GCN Circ. 40429) and not visible in PanSTARRS at: RA(J2000) = 13:28:26.68 = 202.1111 degrees Dec(J2000) = -2:42:11.1 = -2.7030 degrees with an uncertainty of 0.5 arcsec. The preliminary magnitude derived for that source is: i ~ 21.9 We note the presence of a possible host galaxy in deeper Legacy Survey images, located 0.5 arcsec from the optical counterpart candidate, with magnitudes of g = 23.61 +/- 0.04 and r = 23.67 +/- 0.05. We thank the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir and the COLIBRÍ and DDRAGO engineering teams. COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico. View this GCN Circular online at https://gcn.nasa.gov/circulars/40431. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 38461] EP250511a: BOOTES-5 optical upper limit
by GCN Circulars 11 May '25

11 May '25

TITLE: GCN CIRCULAR NUMBER: 40430 SUBJECT: EP250511a: BOOTES-5 optical upper limit DATE: 25/05/11 12:27:11 GMT FROM: I. Perez-Garcia at Institute of Astrophysics of Andalusia <ipg(a)iaa.es> I. Perez-Garcia, E. J. Fernandez-Garcia, M. D. Caballero-Garcia, S.-Y. Wu, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), I. M. Carrasco (SMA), M. Gritsevich (Univ. of Helsinki), C. Perez del Pulgar (Univ. of Malaga), Y.-D. Hu (GXU), S. Jeong (ADD, Daejeon), G. Garcia-Segura and D. Hiriart (IA-UNAM, Ensenada), D. R. Xiong (Yunnan Observatories of CAS, Kunming), and W. H. Lee (UNAM, Mexico DF), on behalf of a larger collaboration, report: Following the detection of EP250511a by EP (Lian et al., GCNC [40429](https://gcn.nasa.gov/circulars/40429)), the 0.6m BOOTES-5/JGU robotic telescope at San Pedro Martir Observatory (Mexico) automatically responded to this high-energy event starting on May 11, 09:22:17 UT (i.e. 1.3 hours after detection and 1 min after notification). No optical transient is detected down to 18.2 mag (clear filter). We would like to thank the staff at San Pedro Martir Observatory for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/40430. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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