GCN Circular 42897
Subject
GRB 251129A / EP251129a: SAO RAS optical observations
Event
Date
2025-11-29T17:59:49Z (a year ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
Web form
A. S. Moskvitin and O. I. Spiridonova (SAO RAS)
report on behalf of GRB follow-up team.
We observed the field of the SVOM GRB 251129A (Tan et al., GCN 42877)
also detected by Einstein Probe as EP251129a (Wu et al., GCN 42884)
and Swift (Evans, GCN 42888; Page et al., GCN 42891)
with the Zeiss-1000 1m telescope of the SAO RAS on November 29,
15:27:01--16:00:22 UT (t_mid - T0 = 0.54973 days). We obtained
6 * 300 sec images in Rc band.
The optical afterglow (Angulo et al., GCN 42880; Wu et al., GCN 42882;
Watson, GCN 42883; Masi, GCN 42885; Li et al., GCN 42887;
Lipunov et al., GCN 42892) is clearly detected in the stacked frame
with the following brightness.
Date UT start t-T0 Exp. Filter OT Err. UL
(mid,days) (n*s) (3sigma)
2025-11-29 15:27:01 0.54973 6*300 Rc 21.00 0.07 22.8
This preliminary photometry is based on nearby stars from the USNO-B1
catalogue (R2 magnitudes) and is not corrected for the Galactic
extinction.