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GCN Circular 17639

GRB 150323C: Mondy optical observations
2015-03-25T13:29:01Z (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 the GRB 150323C (Amaral-Rogers  et al., GCN 
17621) with AZT-33IK telescope of Sayan observatory (Mondy) starting on 
Mar., 23 (UT) 11:42:02. We obtained several images in R-filter of 120 s 
exposure. Within  enhanced Swift-XRT error circle (Osborne et al., GCN 
17633)  we clearly detect optical  afterglow (Xu et al. GCN 17625, Xin 
et al. GCN 17631; Watson et al. GCN 17632) in a combined image. 
Preliminary photometry of the afterglow is following

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

2015-03-24 15:14:09   0.95405  R        44*120  22.4 0.3

Photometry is based on SDSS DR9 stars:

SDSS9_id            R(Lupton)
J125023.08+501048.2 16.84
J125032.04+501021.5 18.37
J125016.28+501035.8 18.22
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