TITLE:   GCN CIRCULAR
NUMBER:  28086
SUBJECT: GRB 200711A: AbAO optical upper limit
DATE:    20/07/13 09:39:24 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Pozanenko (IKI), N. Pankov (HSE), K. Kamyshnikov (HSE), R. Ya. 
Inasaridze (AbAO),  V.R. Ayvazian (AbAO),  G. V.  Kapanadze (AbAO),  S. 
Belkin (IKI), E. Mazaeva (IKI), A. Volnova  (IKI),  I. Molotov (KIAM) 
report on behalf of  GRB IKI FuN:

We observed the field of GRB 200711A (Fermi GBM Team, GCN 28077; 
Marshall et al., GCN 28078; Crnogorcevic et al., GCN 28083) with AS-32 
(0.7m) telescope of Abastumani Observatory starting on 2020-07-11 (UT) 
23:05:40.  We do not detect any object  within the enhanced XRT position 
error circle (Osborne et al., GCN 28081).  Preliminary photometry of the 
field is following.

Date       UT start  t-T0    Filter Exp.  OT    Err. UL
                     (mid, days)     (s)
2020-07-11 23:05:40  0.50074 R      49*60 n/d   n/d 21.3

The photometry is based on nearby USNO-B1.0 stars