GCN Circular 32088
Subject
GRB 220521A: Sintesz-Newton/CrAO optical upper limit
Date
2022-05-22T15:17:22Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Nazarov (CrAO), A. Pozanenko (IKI), S. Belkin (IKI, HSE), N. Pankov
(HSE) report on behalf of IKI GRB FuN:
We observed the GRB 220521A (Dichiara et al., GCN 32076; Fermi GBM
Team, GCN 32075) with Sintesz-Newton 350mm f/5 telescope of CrAO
observatory. Observation started on 2022-05-22 (UT) 01:05:40. The series
consists of images with an exposure of 60 s in a Clear filter.
The optical afterglow (Malesani et al., GCN 32078; Fynbo et al., GCN
32079; Goranskij et al., GCN 32082) is not detected in the stacked image.
Preliminary photometry of the stacked images is following
Date UT start t-T0 Filter Exp. OT err UL(3)
(mid, days) (s)
2022-05-22 01:05:40 0.07626 Clear 9*60 n/d n/d 18.2
The photometry is based on nearby USNO-B1.0 (R2) stars
RA DEC R2
18:21:04.76880 +10:21:04.7232 16.26
18:21:07.39800 +10:20:37.5000 16.73