[vsnet-grb-info 24770] GRB 200122A: Mondy optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26869
SUBJECT: GRB 200122A: Mondy optical upper limit
DATE:    20/01/24 13:19:45 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at 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 200122A (Sonbas et al.  GCN 26844) with 
AZT-33IK telescope of Sayan observatory (Mondy) starting on Jan. 22 (UT) 
  20:23:25.   We  do not detect any optical object in the Enhanced 
Swift-XRT position  (Osborne et al.  GCN 26846). Preliminary photometry 
of the field  is following.

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

2020-01-22 20:23:25   0.79876     R     30*120  n/d      23.3

Photometry is based on the USNO-B2.0 nearby stars
USNO-B1.0_id R2
1175-0271901 16.74
1174-0271881 19.69