GCN Circular 34495
Subject
GRB 230818A: further SAO RAS Zeiss-1000 observations
Date
2023-08-19T19:35:54Z (2 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
Via
legacy email
A. S. Moskvitin (SAO RAS), V. P. Goranskij (SAI MSU),
report on behalf of the GRB follow-up team.
We observed the field of GRB 230818A (Fermi GBM team, GCN 34478;
Tohuvavohu et al., GCN 34479) with the 1-m telescope of SAO RAS
Zeiss-1000 equipped with the CCD photometer. We obtained
4 x 300 sec. images in Rc band on August 19, 17:42:30--18:07:26 UT.
The OT (Lipunov et al., GCNs 34476, 34477, 34481, 34482;
Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483;
Malesani et al., GCN 34485; Siegel and Tohuvavohu, GCN 34486;
Pankov et al., GCN 34487; Quadri and Strabla, GCN 34488;
Klose et al., GCN 34491) is marginally detected with
the brightness of R = 23.0 +/- 0.3 (t_mid - t0 = 0.76903 days).
This preliminary photometry is based on nearby USNO-B1 stars (R2 mag).
The magnitude of the OT is not corrected for MW extinction.