TITLE:   GCN CIRCULAR
NUMBER:  29292
SUBJECT: GRB 210112A: Kitab a optical upper limit
DATE:    21/01/12 11:19:27 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Novichonok (Petrozavodsk State University, KIAM), S. Belkin (IKI), 
A. Pozanenko (IKI), Sh. Ehgamberdiev (UBAI) report on behalf of GRB IKI FuN:

We observed the field of GRB 210112A (Ambrosi  et al., GCN 29289) with 
  Kitab-ISON RC-36  telescope starting on 2021-01-12 (UT) 01:54:30, i.e. 
447 seconds after trigger in Clear filter. We do not detect the 
afterglow candidate (Ambrosi  et al., GCN 29289) within enhanced 
Swift-XRT position (Goad et al., GCN 29290).
Preliminary photometry of the field is following

Date,      UT start, t-T0,   Exp.,  Filter,  OT,   Err., UL
                     (mid, days)
2021-01-12  01:54:30  0.01541 11*30 CR       n/d   n/d   18.5


The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1231-0260671 14:35:00.70080 +33:06:09.4428 14.32
1229-0281658 14:34:57.67344 +32:58:13.0800 14.75



At 01:37:03 UT