[vsnet-grb-info 27607] GRB 210323A: Kitab optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29710
SUBJECT: GRB 210323A: Kitab optical upper limit
DATE:    21/03/24 15:05:43 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the field of short GRB 210323A (Swift detection: Gropp et 
al., GCN 29699; GBM/Fermi detection: Hamburg et al., GCN 29709)
with  Kitab-ISON RC-36  telescope starting on 2021-03-23 (UT) 22:36:32. 
We obtained several images in Clear filter. We do not detect the 
afterglow candidate (Malesani et al., GCN 29703; Pozanenko et al., GCN 
29708) within enhanced Swift-XRT position (Evans et al., GCN 29704).
Preliminary photometry of the field is following

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

2021-03-23  22:36:32  0.02759 11*60 CR       n/d   n/d   16.6


The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1153-0524361 15.3
1153-0524625 14.44
1153-0524441 15.36