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GCN Circular 16372

GRB 140521A: AAO optical upper limit
2014-06-09T19:46:36Z (10 years ago)
Alexei Pozanenko at IKI, Moscow <>
A. Volnova (IKI), R. Inasaridze (AAO), O. Kvaratskhelia (AAO), V.
Ayvazian (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed second epoch of the field of the Swift GRB 140521A (Troja et 
al., GCN 16311) with AS-32 (0.7m) telescope of Abastumani Observatory 
starting on May,  22 (UT) 21:34:30. We obtained several unfiltered 
frames with exposure of 120 s. In comparison with our first epoch 
observation (Volnova et al., GCN 16317)  we do not detect any variable 
source within the BAT ground-calculated position (Barthelmy et al.,  GCN 

A photometry is based on the same reference star used in first epoch 
(see GCN 16311):

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

2014-05-22 21:34:30 1.12809      None    38*120   21.5
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