GCN Circular 42250
Subject
GRB 251014A: SAO RAS optical upper limit
Event
Date
2025-10-14T10:06:03Z (2 days ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
Web form
A. S. Moskvitin, O. I. Spiridonova (SAO RAS),
report on behalf of GRB follow-up team.
We observed the field of the GRB 251014A (Ambrosi et al., GCN 42238;
The Fermi GBM team, GCN 42237; de Barra et al., GCN 42249)
with the 1-m SAO RAS telescope Zeiss-1000 equipped
with the CCD-photometer. We obtained 7 x 300 sec. images in Rc band
under mediocre weather conditions on 2025.10.14, 00:51:01--01:38:56 UT
(t_mid - T0 = 0.77458 hours).
Within our FOV (covers ~80% of northern part of Swift-BAT error
circle) we do not detect any new source down to the limiting
magnitude of R_lim = 21.5. The field calibrated against nearby
USNO-B1.0 stars (R2 magnitudes) and not corrected for the Galactic
extinction.