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GCN Circular 9709

Subject

GRB 090726: optical transient candidate

Date

2009-07-27T03:50:30Z (15 years ago)

From

Vladimir Sokolov at SAO RAS <sokolov@sao.ru>

A. Moskvitin, T. Fatkhullin & A. Valeev
(SAO-RAS Niznijh Arkhyz, Russia),
on behalf of a larger colaboration, report:

We have observed the field of GRB090618
(Page et al., GCN 9706Loading...
 
 ) with the 1-m telesecope
of the SAO RAS in Caucasus. Within the XRT error
circle (Page et al., GCN 9707Loading...
 
 ) we detected one
object which not present in the DSS. The object's
coordinates are:
    R.A. (J2000.0) = 16:34:43.044
    DEC. (J2000.0) = +72:53:04.82
with uncertainty about 0.5 arcsec. Using
the USNO A2.0 star 1628-0121951 (R2=14.51)
as a calibration we estimated the object's
brightness as following:

   R_mag         exp.(sec)       mid.time
                             (sec after the trigger)
18.26 +/- 0.05     60              2126
18.39 +/- 0.05     60              2252
18.33 +/- 0.05     60              2344
18.71 +/- 0.05    120              3183
18.97 +/- 0.05    180              4296
19.17 +/- 0.06    180              5492
19.28 +/- 0.07    240              6089
19.55 +/- 0.12    300              6824

According to its variability we concluded that
the detected object is the OT of the GRB090726.

Further analysis are ongoing.

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