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

[vsnet-grb-info 38036] GRB 250402B: AstroSat CZTI detection of a short burst
by GCN Circulars 03 Apr '25

03 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40016 SUBJECT: GRB 250402B: AstroSat CZTI detection of a short burst DATE: 25/04/03 04:52:18 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> M. Tembhurnikar (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: Analysis of AstroSat CZTI data with the CIFT framework (Sharma … [View More]

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[vsnet-grb-info 38035] GRB 250402A: SVOM/VT optical counterpart
by GCN Circulars 03 Apr '25

03 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40015 SUBJECT: GRB 250402A: SVOM/VT optical counterpart DATE: 25/04/03 00:26:36 GMT FROM: Liping Xin at NAOC, SVOM <xlp(a)nao.cas.cn> L.P. Xin, Y. L. Qiu, C. Wu, H. L. Li, J . Z. H. Yao, Y. Xu, P. P. Zhang, W. J. Xie, J. Wang, X. H. Han, Y. J. Xiao, H. B. Cai, Y. N. Yi, J. Y. Wei (NAOC), J. T. Palmerio(CEA/Irfu), T. Sadibekova(CEA) report on behalf of the SVOM team: SVOM performed an automatic slew on the burst triggered by SVOM/ECLAIRs (Chen et al., … [View More]

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[vsnet-grb-info 38034] GRB 250402A: SVOM detection of a burst
by GCN Circulars 03 Apr '25

03 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40014 SUBJECT: GRB 250402A: SVOM detection of a burst DATE: 25/04/03 00:15:14 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> X. Chen(YNU), Y. Hu(GXU), H. Yang(IRAP), B. Cordier (CEA), L. Zhang(IHEP), P. Maggi (ObAS) on behalf of the SVOM mission team. At 2025-04-02T23:07:56 UTC (Tb) SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250402A (SVOM burst-id sb25040203). The following trigger information was received on the ground with low latency by the … [View More]SVOM VHF Alert Network. The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 15 alerts. IMT provided the alert with the best signal-to-noise-ratio (SNR) of 27.79 in the [8-120] keV energy band over a time window of 40.96 seconds starting at Tb. The light curve showed a long GRB with a T90 duration of about 35 (+/-3) s. The localization of the best alert is R.A., Dec 213.3783, -5.9457 degrees (J2000) with a 90% C.L. radius of 3.42 arcmin (including systematic error of 2 arcmin added in quadrature). SVOM slewed to the burst. MXT began observing the field at 2025-04-02T23:10:58 UTC, 183 seconds after Tb. Using onboard processed data we found an uncatalogued X-ray source located at R.A., Dec 213.3893, -5.9468 degrees: RA (J2000) = 14h13m33.44s DEC (J2000) = -5d56m48.59s with a 90% C.L. radius of 45 arcseconds(including 25 arcseconds systematic error added in quadrature). This location is 0.66 arcminutes from the ECLAIRs onboard position. This position may be improved as more data is received. 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. The Burst Advocate (BA) on shift for this burst is X. Chen: xlchen(a)stu.ynu.edu.cn. 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/40014. --- 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 38033] GRB 250331C: Calapai Observatory, Massa S. Giorgio (Messina), upper limit
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40013 SUBJECT: GRB 250331C: Calapai Observatory, Massa S. Giorgio (Messina), upper limit DATE: 25/04/02 20:48:13 GMT FROM: Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, Messina, Italy <giovannicalapai(a)tiscali.it> Giovanni Calapai at Calapai Astronomical Observatory, Massa S. Giorgio, (Messina) Italy Member of: GRB/UAI Gamma Ray Burst Section of Unione Astrofili Italiani. Report: We imaged the field of GRB 250331C … [View More]

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[vsnet-grb-info 38032] GRB 250314A: ALMA detection
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40012 SUBJECT: GRB 250314A: ALMA detection DATE: 25/04/02 20:20:24 GMT FROM: Tanmoy Laskar at U of Utah <tanmoylaskar(a)gmail.com> T. Laskar (University of Utah), R. Margutti, R. Chornock, Nayana A. J. (UC Berkeley), K. D. Alexander (University of Arizona), and H. Sears (Rutgers University) report: “We observed the high-redshift (z ~ 7.3; Malesani et al., GCN 39732; Rakotondrainibe et al., GCN 39743) SVOM/ECLAIRs GRB 250314A (Wang et al., GCN 39719) … [View More]

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[vsnet-grb-info 38031] GRB 250329B: Swift/UVOT Upper Limit
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40011 SUBJECT: GRB 250329B: Swift/UVOT Upper Limit DATE: 25/04/02 15:39:59 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M.H. Siegel (PSU) and R. Caputo (GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250329B 7.4 ks after the SVOM trigger sb25032902 (Xie et al., GCN Circ. 39925). We do not detect an afterglow at the position of the XRT counterpart (Beardmore et al., GCN Circ. … [View More]

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[vsnet-grb-info 38030] GRB 250329A: Swift/UVOT Upper Limit
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40010 SUBJECT: GRB 250329A: Swift/UVOT Upper Limit DATE: 25/04/02 15:12:53 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M.H. Siegel (PSU) and R. Caputo (GSFC) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250329A 6.8ks after the SVOM trigger sb25032901 (Wang et al., GCN Circ. 39916). We do not detect an afterglow at the position of the XRT counterpart (Dichiara et al., GCN Circ. … [View More]

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[vsnet-grb-info 38029] GRB 250327B: Swift/UVOT Detection
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40009 SUBJECT: GRB 250327B: Swift/UVOT Detection DATE: 25/04/02 13:32:05 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M.H. Siegel (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250327B 1753 s after the SVOM trigger sb25032706 (GCN Circ. 39888). A fading source consistent with the XRT position (Page et al., GCN Circ. 39895) and the optical counterpart (Moskvitin et al., GCN … [View More]

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[vsnet-grb-info 38028] GRB 250327A: Swift/UVOT Upper Limits
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40008 SUBJECT: GRB 250327A: Swift/UVOT Upper Limits DATE: 25/04/02 13:08:08 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H. Siegel (PSU) and T. M. Parsotan (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250327A 13.8 ks after the BAT trigger (Parsotan et al., GCN Circ. 39877). No optical afterglow consistent with the XRT position (Burrows et al., GCN Circ. 39892) GCN Circ. … [View More]

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[vsnet-grb-info 38027] GRB 250331E: SVOM/GRM observation
by GCN Circulars 02 Apr '25

02 Apr '25

TITLE: GCN CIRCULAR NUMBER: 40007 SUBJECT: GRB 250331E: SVOM/GRM observation DATE: 25/04/02 08:09:11 GMT FROM: Yue Wang <m18509381757(a)163.com> SVOM/GRM team: Yue Wang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Frédéric Daigne (IAP), Frédéric Piron (LUPM), Nicolas Dagoneau (CEA) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by GRB 250331E (SVOM trigger reference: sb25033103) at 2025-03-31T22:46:… [View More]

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