GCN Circular 44918
Subject
GRB 260610B / AT2026owq: SAO RAS optical observations
Event
Date
2026-06-11T22:05:25Z (2 days ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
Web form
A. Moskvitin (SAO RAS), O. Spiridonova (SAO RAS), A. Pozanenko (IKI),
A. Volnova (IKI), N. Pankov (IKI) report on behalf of GRB follow-up team
We observed the field of GRB 260610B discovered by Fermi (The Fermi
GBM team, GCN 44891; GCN 44901) with the Zeiss-1000 1-m telescope
of SAO RAS equipped with the CCD photometer. The observations
carried out in BVRcIc filters starting June 11, 19:43:01 UT
(since ~ 1.4 days since trigger).
The OT (O'Neill et al., GCN 44903; Watson et al., GCN 44905;
Zhu et al., GCN 44909; Gillanders et al., GCN 44910; Akl et al.,
GCN 44911; O'Neill et al., GCN 44914) is clearly detected in
our frames with the following brightness:
Date, UTstart, t-T0, Exp., Filter, Mag, Err., UL
(mid,d) (n*s) (3-sigma)
2026-06-11 19:43:01 1.40315 2*300 Rc 19.73 0.03 22.6
This preliminary photometry is based on nearby SDSS stars
(using Lupton 2005 transformation equations) and not corrected
for Galactic extinction. The observations are ongoing.