GCN Circular 3903

Subject

GRB 050827 : OSN 1.5m optical observations

Event

Date

2005-08-29T17:52:41Z (20 years ago)

From

Sergei Guziy at IAA <gss@iaa.es>

S. Guziy, J. Gorosabel, A.J. Castro-Tirado, V. Casanova, 
A. de Ugarte Postigo, M. Jelinek, (IAA-CSIC) report:

 "We have acquired R and I-band images of the GRB 050827 
 XRT error box (Capalbi et al. GCN Circ. 3899Loading...
 
 ) with the OSN
 1.5m telescope. We detect two objects consistent with the 
 8" radius XRT error circle. The coordinates of the two 
 objects are:

  Source 1:
     RA(J2000) =  04:17:08.9
     DEC(J2000)= +18:11:57.0

  Source 2:
     RA(J2000) =  04:17:09.6
     DEC(J2000)= +18:12:02.0

 with a conservative astrometric error of 1.5".

 Based on the USNO catalog we estimate magnitudes of 
 R=23.7 � 0.37 and R=23.4 � 0.26 for S1 and S2, 
 respectively. A finding chart can be found at:

 http://www.dsri.dk/~jgu/grb050827/FCs/osn.R.gif

 Further observations are encouraged to check the 
 reliability/variability of the two optical sources.

 We thank Julius Halpern for making us available his
 1.3m MDM telescope images."

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