GCN Circular 46062
Subject
GRB 261026A: SAO RAS optical observations
Event
Date
2026-10-27T16:49:43Z (15 hours ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
email
A. Moskvitin (SAO), V. Goranskij (SAI MSU, SAO), V. Vlasyuk (SAO),
A. Volnova (IKI), N. Pankov (IKI), A. Pozanenko (IKI),
on behalf of the SAO GRB follow-up team and the IKI-GRB-FuN report.
We observed the field of GRB 261026A discovered by SVOM (Goto et al.,
GCN 46030), also detected by EP-FXT (Jiang et al., GCN 46058)
with the SAO RAS 1-m Zeiss-1000 and 0.5-m AS-500(2) telescopes
on October 26.
The OT (Dornic et al., GCN 46033; Zheng et al., GCN 46034; Wu et al.,
GCN 46035; Li et al., GCN 46046; Morín-González et al., GCN 46048;
Coyo et al., GCN 46054; also observed in NIR, Mohan et al., GCN 46041;
Shi et al., GCN 46047) is detected only in the Zeiss-1000 stacked frame.
Details of the observation are the following.
Date UT start t-T0 Exp, Filter Obj Err UL
Telescope
(mid,days) (n*s) (3sigma)
2026-10-26 20:11:58 0.59342 4*300 Rc 21.5 +/- 0.2 22.1
Zeiss-1000
2026-10-26 20:41:16 0.61058 30*30 R n/d n/d 20.5 AS-500
(2)
This preliminary photometry (Vega) is based on nearby SDSS stars
(Lupton 2005 transformation) and not corrected for Galactic extinction.