TITLE:   GCN CIRCULAR
NUMBER:  26180
SUBJECT: GRB 191106A: Mondy optical upper limit
DATE:    19/11/06 16:15:08 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), E. Mazaeva (IKI), 
A. Volnova    report   on behalf of IKI-GRB-FuN:

We observed the field of  GRB 191106A (Marshall et al.  GCN 26177) with 
AZT-33IK telescope of Sayan observatory (Mondy) starting on Nov. 06 (UT) 
  14:24:30, i.e. ~11 minutes after GRB trigger.   We  do not detect any 
optical object in the XRT error circle  (Marshall et al.  GCN 26177). 
Preliminary photometry of the field  is following.

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

2019-11-06 14:24:30    0.03688    R      22*120  n/d      22.0


Photometry is based on the USNO-B2.0 nearby stars.