GCN Circular 30825
Subject
GRB 210912A: Mondy optical afterglow confirmation
Event
Date
2021-09-12T17:21:48Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (HSE), S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP)
report on behalf of GRB IKI FuN:
We observed the field of GRB 210912A (Troja et al., GCN 30820) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on
2021-09-12(UT) 12:57:48. We obtained 30 images in R-filter. We confirm
the fading object suggested by Hu et al. (GCN 30823) as the optic
afterglow of GRB 210912A. Preliminary photometry of the object in
stacked images is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-09-12 12:57:48 0.10112 R 29*120 21.33 0.14 22.5
The photometry is based on the nearby USNO-B1.0 stars
RA DEC R2
08:39:12.26208 +79:12:37.1304 15.88
08:39:10.94880 +79:16:33.8916 15.26