GCN Circular 44877
Subject
GRB 260604C: further SAO RAS optical observations
Event
Date
2026-06-08T22:27:43Z (4 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 long GRB 260604C discovered by Fermi
(The Fermi GBM team, GCN 44822; Neights & Meegan, GCN 44831);
SVOM (Gotz et al., GCN 44823) and GECAM-B (Luo et al., GCN 44854)
with the Zeiss-1000 1-m telescope of SAO RAS equipped with the CCD
photometer. We obtained 12 x 300 sec. images in Rc band on June 08,
20:01:14--21:07:58 UT.
The OT (Lipunov, GCN 44827; Konno et al., GCN 44828; GCN 44836;
Zhu et al., GCN 44832; Becerra et al., GCN 44834; Hellot et al.,
GCN 44835; Gompertz et al., GCN 44837; Gompertz et al., GCN 44843;
Chen et al., GCN 44851; Moskvitin et al., GCN 44852; Sasaki et al.,
GCN 44857; Pankov et al., GCN 44858; Pankov et al., GCN 44862;
Burkhonov et al., GCN 44865; Lincetto et al., GCN 44873)
is detected in our stacked image with the following brightness:
Date UTstart t-T0 Exp. Filter Mag +/- Err. UL
(mid,d) (n*s) (3-sigma)
2026.06.08 20:01:14 4.01102 12*300 Rc 23.08 +/- 0.18 23.8
The preliminary photometry is based on nearby SDSS stars (R-magnitudes
were obtained using Lupton 2005 transformation equations)
as in Moskvitin et al., GCN 44852, and was not corrected
for the Galactic extinction.