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

[vsnet-grb-info 37436] GRB 250221A: Mondy optical observations
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39424 SUBJECT: GRB 250221A: Mondy optical observations DATE: 25/02/22 12:25:53 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunlo (ISTP), A. Volnova (IKI) report on behalf of IKI GRB FuN: We observed the optical afterglow (Francile et al., GCN 39395; Watson et al., GCN 39397; Melandri et al., GCN 39406; Shilling et al., GCN 39409; Guo et al., GCN 39412; Muenter et al., GCN 39417; … [View More]

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[vsnet-grb-info 37435] Konus-Wind detection of GRB 250221A
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39423 SUBJECT: Konus-Wind detection of GRB 250221A DATE: 25/02/22 12:13:42 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaya, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report GRB 250221A (Swift detection: Caputo et al., GCN 39396) was detected by Konus-Wind (KW) in the waiting mode. A Bayesian block analysis of the KW waiting mode data in the 20-400 keV … [View More]

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[vsnet-grb-info 37434] GRB 250221A: Assy optical observations
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39422 SUBJECT: GRB 250221A: Assy optical observations DATE: 25/02/22 11:10:50 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> N. Pankov (HSE, IKI), V. Kim (FAI), M. Krugov (FAI), Y. Aimuratov (FAI), A. Volnova(IKI), A. Pozanenko (IKI) report on behalf of IKI GRB FuN: We observed the optical afterglow (Francile et al., GCN 39395; Watson et al., GCN 39397; Melandri et al., GCN 39406; Shilling et al., GCN 39409; Guo et al., GCN 39412; … [View More]

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[vsnet-grb-info 37433] EP250220a: FTW optical and NIR observations and upper limits
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39421 SUBJECT: EP250220a: FTW optical and NIR observations and upper limits DATE: 25/02/22 11:03:18 GMT FROM: Malte Busmann at Ludwig-Maximilians-Universität München <m.busmann(a)physik.lmu.de> Malte Busmann (LMU), Brendan O’Connor (Carnegie Mellon U.), Daniel Gruen (LMU) and Antonella Palmese (Carnegie Mellon U.) report: We observed the 90% EP-FXT localization area of EP250220a (Wang et al., GCN 39387; Hu et al., GCN 39420) with the Three Channel … [View More]

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[vsnet-grb-info 37432] EP250220a: EP-FXT follow-up observations
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39420 SUBJECT: EP250220a: EP-FXT follow-up observations DATE: 25/02/22 08:11:55 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> D. F. Hu (PMO, CAS), Y. L. Wang (NAOC, CAS), P. Y. Han, C. X. Zhang (HUST), B. B. Zhang (BNU), Y. Liu (NAOC, CAS) report on behalf of the Einstein Probe team: Following the detection of the fast X-ray transient EP250220a (Wang et al., GCN 39387), we performed two follow-up observations with the Follow-up X-ray Telescope (… [View More]

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[vsnet-grb-info 37431] GRB 250219A: NUTTelA-TAO / BSTI Optical Limits
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39419 SUBJECT: GRB 250219A: NUTTelA-TAO / BSTI Optical Limits DATE: 25/02/22 07:47:55 GMT FROM: Toktarkhan Komesh at Nazarbayev University <toktarkhan.komesh(a)nu.edu.kz> T. Komesh (NU), Z. Abdullayev (NU), Z. Maksut (NU), D. Berdikhan (NU), B. Grossan (UCB, NU), M. Krugov (FAI) and E. Abdikamalov (NU) report on behalf of the Energetic Cosmos Laboratory: We imaged the field of GRB 250219A with the Nazarbayev University Transient Telescope at Assy-… [View More]

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[vsnet-grb-info 37430] GRB 250221A: VLT/X-shooter redshift z = 0.768
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39418 SUBJECT: GRB 250221A: VLT/X-shooter redshift z = 0.768 DATE: 25/02/22 04:24:41 GMT FROM: J. T. Palmerio at CEA-Saclay <jesse.palmerio(a)obspm.fr> J. T. Palmerio (CEA/Irfu), A. Saccardi (CEA/Irfu), B. Rayson (U. Leicester), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. J. Levan (Radboud and Warwick), N. R. Tanvir (U. Leicester) report on behalf of the Stargate collaboration: We observed the optical afterglow (Francile et al., GCN 39395; Caputo … [View More]

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[vsnet-grb-info 37429] GRB 250221A: GRANDMA/TAROT Detection
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39417 SUBJECT: GRB 250221A: GRANDMA/TAROT Detection DATE: 25/02/22 03:00:44 GMT FROM: Heather N. Muenter at UMN <hmuenter000(a)gmail.com> H. Muenter (UMN), F. Magnani (CPPM), S. Antier (OCA/IJCLAB), Y. Rajabov (UBAI), C. Andrade (UMN), A. Klotz (IRAP), C. Limonta, Q. Andre, A. Durroux (OCA), M. Coughlin (UMN),S. Karpov (FZU), P. Hello (IJCLAB), P-A. Duverne (APC), T. Pradier (Unistra/IPHC), N. Guessoum (AUS) on behalf of the GRANDMA collaboration: … [View More]

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[vsnet-grb-info 37428] Fermi trigger No 761805304: Global MASTER-Net observations report
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39416 SUBJECT: Fermi trigger No 761805304: Global MASTER-Net observations report DATE: 25/02/22 02:32:22 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, … [View More]

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[vsnet-grb-info 37427] Fermi Gamma-ray Burst Monitor trigger 761867337/250221909 is not a GRB
by GCN Circulars 22 Feb '25

22 Feb '25

TITLE: GCN CIRCULAR NUMBER: 39415 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 761867337/250221909 is not a GRB DATE: 25/02/22 01:10:05 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 761867337/250221909 at 21:48:52.46 UT on 21 February 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local … [View More]

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