TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3635
SUBJECT: GRB050712: optical limits
DATE:    05/07/17 16:28:43 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

V.Rumyantsev,  E.Sergeeva (CrAO), D.Sharapov, M.Ibrahimov (MAO), G.
Kornienko (UAPhO), A.Pozanenko (IKI) on behalf of larger  GRB follow up
collaboration report:

We have observed the error box  of the Swift GRB050712 (D. Grupe et al., GCN
3573)  with 0.4m telescope of  Ussuriysk Astrophysical Observatory (UAPhO),
1.5m telescope of Maidanak observatory (MAO), and 0.7m AZT-8 telescope of
CrAO on July, 12-13.  We do not detect OT found by  T. Poole et al. (GCN
3596)  and E. Maiorano et al. (GCN 3601). Upper limits of   stacked images
calibrated against  of R USNO-A2.0 are following:

Start time,   Exposure, Filter, Limiting mag.



(UT)             (s)



July,12 15:06    4x60    none   15.0

July,12 23:09    3x180   R      19.0

July,13 00:36   11x60    R      19.5



Detailed analysis of the observed images is underway.


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