GCN Circular 26965
Subject
GRB 200131A: ISON-Castelgrande optical observations
Date
2020-02-02T21:30:37Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), S. Schmalz (KIAM), V. Kim (AFIF, Pulkovo
Observatory), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM)
report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 200131A (Sbarufatti al., GCN 26953)
with ORI-22 telescope of ISON-Castelgrande observatory starting on
Jan. 31 (UT) 23:11:28. We obtained 120 images of 60 s exposure in
Clear filter. The optical afterglow (Sbarufatti al., GCN 26953;
Lipunov al., GCN 26954; Butler al., GCN 26957; Strausbaugh al., GCN
26959; Kuin al., GCN 26962) is best detected in the stacked image of
the first 60 images.
Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err.
(mid, days) (s)
2019-01-31 23:11:28 0.04353 Clear 60*60 18.35 0.25
The photometry is based on nearby USNO-B1.0 stars (R2 magnitude).