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GCN Circular 17540

GRB 150302A: Mondy optical upper limit
2015-03-03T18:09:34Z (9 years ago)
Alexei Pozanenko at IKI, Moscow <>
E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev 
(ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of 
larger GRB follow-up collaboration:

We observed the field of GRB 150302A (Lien et al., GCN 17526) with 
AZT-33IK telescope of Sayan observatory (Mondy). We obtained several 
images in R-filter on Mar., 02, starting (UT) 15:55:19. Within enhanced 
XRT error circle (Goad et al., GCN 17534)  we do not detect any optical 
source. In particular, we do not detect the afterglow candidate (Fynbo 
et al., GCN 17527). Upper limit is following

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

2015-03-02 15:55:19   0.44045  R       43*60  21.6

The photometry   is based on nearby SDSS DR9 stars
SDSS9_id	        R(Lupton)	
J114204.20+364911.9	16.90	
J114201.34+365107.3	19.45	
J114159.81+365111.7	19.15
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