Skip to main content
Due to the lapse in federal government funding, NASA is not updating this website. See the Operations FAQ for GCN impacts.
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

GCN Circular 42203

Subject
GRB 251011B : MASTER optical observations
Date
2025-10-11T23:11:20Z (7 hours ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
P.Balanutsa, V.Lipunov, A.Kuznetsov, G.Antipov, I.Panchenko, K.Zhirkov, N.Tiurina, A.Sankovich, Ya.Kechin, M.Shilova, A.Chasovnikov, V.Topolev,
V.Senik, D.Vlasenko, Yu.Tselik, E.Gorbovskoy(Lomonosov MSU),
R.Podesta, C.Francile,  F. Podesta, E. Gonzalez (OAFA, San Juan Uni.,Argentina);
D.Buckley, (SAAO, South Africa)
O.Gress, N.Budnev (ISU, Irkutsk),
A. Sosnovskiy (CrAO RAS),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
V.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias, Spain),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella,
L.H.Rodriguez (INAOE, Guillermo Haro  Astrophysic Observatory, Mexico)

The MASTER-OAFA robotic telescope of the MASTER Global Robotic Net [1,2,3,4]
started GRB 251011B (Fermi GCN 42196, Swift: D'Ai et al. GCN 42197, XRT Evans et al. GCN 42201,
Ttrigger=2025-10-11 07:08:22UT    XRT RA,Dec(2000)=00h 52m 56.33s,-62d 02' 00.2")
at 2025-10-11 07:09:27 with 10s expositions at 48 deg.altitude
There is no optical counterpart on a single images
Observations and reduction will be continued.

Tstart(+exp), UT        RADec(2000) of MASTERsquarecent. Exp,s mlim
2025-10-11 07:09:07	00h 53m 53.80s -61d 58m 00.8s 	10	18.0
2025-10-11 07:09:23	00h 53m 53.92s -61d 58m 00.0s 	10	18.0
2025-10-11 07:09:39	00h 53m 53.86s -61d 58m 00.6s 	20	18.6
2025-10-11 07:10:05	00h 53m 53.91s -61d 58m 00.5s 	20	18.9
2025-10-11 07:10:31	00h 53m 54.05s -61d 57m 59.3s 	30	18.0
2025-10-11 07:11:06	00h 53m 54.18s -61d 57m 59.2s 	30	18.0
2025-10-11 07:11:43	00h 53m 54.30s -61d 57m 59.1s 	40	18.3
2025-10-11 07:12:29	00h 53m 54.50s -61d 57m 58.5s 	50	18.8
2025-10-11 07:13:25	00h 53m 54.74s -61d 57m 58.3s 	60	19.2
2025-10-11 07:14:32	00h 53m 55.02s -61d 57m 57.6s 	70	19.6
2025-10-11 07:15:47	00h 53m 55.39s -61d 57m 57.1s 	90	19.6
2025-10-11 07:17:23	00h 53m 55.79s -61d 57m 56.7s 	110	19.6
2025-10-11 07:19:19	00h 53m 56.33s -61d 57m 55.8s 	130	19.6
2025-10-11 07:21:35	00h 53m 57.00s -61d 57m 55.1s 	160	19.6
up to 2025-10-11 09:17:08.



[1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L
[2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271
[3] Lipunov et a. 2019, ARep, vol.63, 293
[4] Lipunov V., Kornilov V., Gorbovskoy E., Tiurina N., Kuznetsov A.
 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics,
Lomonosov MSU PRESS, 591pp.
http://www.pereplet.ru/lipunov/625.html#625

Looking for U.S. government information and services? Visit USA.gov