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GCN Circular 15137

GRB 130822A: optical upper limits
2013-08-30T13:20:03Z (11 years ago)
Alexei Pozanenko at IKI, Moscow <>
A. Volnova (IKI), R.Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian(AAO), Yu. Krugly (IA KhNU), I. Slyusarev (IA KhNU), I. Molotov 
(KIAM), V. Linkov (ISON), A. Pozanenko (IKI)  report on behalf
of  larger GRB follow-up collaboration:

We observed the field of Swift GRB 130822A (Kocevski et al., GCN 15112) 
on Aug., 22 with AS-32 (0.7m) telescope of Abastumani Observatory, 
SANTEL-400AN (0.4m) telescope of ISON-Kislovodsk observatory, and AZT-8 
(0.7m) telescope of Institute of Astronomy, Kharkiv National University. 
We obtained several unfiltered frames with exposures of 120 s (AS-32), 
100 s and 60 s (SANTEL-400AN), and several frames with filter R with 
exposure of 120 s (AZT-8).  Within the enhanced XRT circle (Beardmore et 
al., GCN 15117) we did not detect any source on stacked images.

The details of the photometry are the following:

Telescope t_start, UT  filter exptime,s    t-t0, mid, days    uplim

AZT-8     21:39:21     R      55*120       0.28000            20.6
S-400     22:31:37     None   23*100       0.30332            19.3
AS-32     23:46:59     None   40*120       0.36513            21.9

The photometry is based on SDSS stars, R mag (R mag obtained via
transformations ugriz in BVRI (Lupton, 2005):

SDSS id             R      R_err
J015202.75-031421.9 12.80  0.012
J015134.64-031348.8 13.95  0.013
J015148.69-030854.9 14.62  0.013
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