GCN Circular 31567
Subject
GRB 210919A: Maidanak optical observations
Date
2022-02-10T18:18:46Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (HSE, IKI), A. Pozanenko (IKI), S. Belkin (IKI, HSE), O.
Burhonov (UBAI), Sh. Ehgamberdiev (UBAI) report on behalf of GRB IKI FuN:
We observed the filed of GRB 210919A detected by Swift (Tohuvavohu et
al. GCN 30846) with AZT-22 1.5m telescope of Maidanak observatory on
Sep. 19, and 20, 2021. Within enhanced Swift-XRT position (Goad et al.
GNC 30850) we do not detect the potential afterglow (Kann et al. GCN
30883, 30884) in both epochs. In the deep observation on 2021-09-19 with
a mean seeing of 1" we marginally detected the host galaxy candidate
reported by O'Connor et al. (GCN 30934) and Kann et al. (GCN 30983) at
the redshift of z=0.2411 (Rossi et al. GCN 31453). Using aperture
photometry we found R = 24.05 +/- 0.35 of the host galaxy candidate. We
do not detect the source at the eastern edge of the XRT error circle
reported by Kann et al. (GCN 30983).
Preliminary photometry of the field in following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-09-19 22:27:50 0.94950 R 32*180 n/d n/d 24.2
2021-09-20 23:04:55 1.95651 R 14*180 n/d n/d 22.9
The photometry is based on the nearby SDSS-DR12 stars, R magnitude
calculated by Lupton' transformations.