GCN Circular 27257
Subject
GRB 200227A: Mondy optical upper limit
Date
2020-02-28T14:30:50Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI),
A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200227A (Fermi GBM Team et al., GCN 27233;
Laha et al., GCN 27234) with AZT-33IK telescope of Sayan observatory
(Mondy) starting on Feb. 27 (UT) 12:47:07. Within enhanced Swift-XRT
position of afterglow (Beardmore et al., GCN 27243) we did not detect
optical
afterglow in agreement with previously reported non-detection (Oeda et
al., GCN 27236; Oates et al., GCN 27244). Preliminary photometry of the
field is following.
Date UT start, t-T0 Filter Exp. OT UL(3sigma)
(mid, days) (s)
2020-02-27 12:47:07 0.24582 R 27*120 n/d 23.2
Photometry is based on the SDSS-DR12 nearby stars (Lupton���s transformation)
SDSS-DR12_id R(Lupton)
J034542.04+092727.3 18.56
J034546.87+092955.7 17.19
J034534.13+092646.2 17.32