Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 29710

GRB 210323A: Kitab optical upper limit
2021-03-24T15:05:43Z (3 years ago)
Alexei Pozanenko at IKI, Moscow <>
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
Looking for U.S. government information and services? Visit