[vsnet-grb-info 24790] GRB 200125A: AbAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26889
SUBJECT: GRB 200125A: AbAO optical upper limit
DATE:    20/01/26 18:25:59 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO ), E. 
Mazaeva (IKI), A. Volnova (IKI),  V. R. Ayvazian  (AbAO ), G.V. 
Kapanadze (AbAO), I. Molotov (KIAM) report on behalf of larger IKI GRB 
follow-up collaboration:

We observed  GRB 200125A (Lien et al., GCN 26876) with AS-32 (0.7m) 
telescope of Abastumani Observatory starting on Jan. 26 (UT) 01:32:27. 
We obtained several 60 s exposures  in R-filter. We do not detect any 
source within enhanced Swift-XRT position (Beardmore et al., GCN 26878) 
in the stacked image. In particular we do not detect counterpart 
candidate (Watson et al., GCN 26882;  Melandri et al., GCN 26887)
Photometry of the field  is following

Date       UT start t-T0    Filter Exp.  OT    Err. UL(3sigma)
                    (mid, days)     (s)

2020-01-26 01:32:27 0.520   R      56*60 n/d   n/d  21.2

Photometry is based on nearby USNO-B1.0 stars (R2 magnitude):

USNO-B1.0_id R2
0818-0339924 16.46
0818-0339917 16.94