GCN Circular 37289
Subject
GRB 240825A: MASTER optical counterpart observation
Event
Date
2024-08-25T23:03:31Z (a year ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V.Lipunov (MSU), D.Buckley (SAAO),
K.Zhirkov, I.Gorbunov, P.Balanutsa, G.Antipov, A.Kuznetsov, N.Tiurina,
E.Gorbovskoy, D.Vlasenko, Ya.Kechin, Yu.Tselik, V..Senik (Lomonosov MSU,SAI,PhysicsDepartment),
O.Gress, N.Budnev(ISU),
A.Sosnovskij (Crimean Astrophysical Observatory, RAS),
C.Francile. F. Podesta, R.Podesta (Observatorio Astronomico Felix AguilarOAFA),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
started observation (Lipunov et al. GCN 37279) of Swift GRB240825A
(R.Gupta et al. GCN 37274) in MASTER-SAAO and MASTER-Tavrida (rain in MASTER-Amur, -Tunka and -Kislovodsk).
The optical transient, discovered by Swift and also observed by
Nanshan HMT / Jiang et al., GCN #37275; Skynet / Dutton et al., GCN #37276; AKO / Odeh et al., GCN #37277,
Mephisto / Zhang et al. GCN 37278, GMG / Li et al., GCN #37280)
was detected at MASTER-SAAO images started 2024-08-25 18:05:12 with unfiltered m_OT=20.1 (mlim=21.0).
There are several SDSS objects inside 3" from Swift-UVOT position in VIZIER database,
the closest is SDSS galaxy (also visible in Pan-STARRs images) in 0.07" with rmag=23.095 https://skyserver.sdss.org/dr9/en/tools/quicklook/quickobj.asp?id=1237663785264350187 .
Observations and reduction will be continued.