GCN Circular 12025
Subject
GRB 110520A - NOT optical observation
Date
2011-05-21T01:13:53Z (13 years ago)
From
Steve Schulse at U. of Iceland <steve@raunvis.hi.is>
S. Schulze (U. Iceland), D. Xu (WIS), D. Malesani (DARK/NBI), P.
Jakobsson (U. Iceland),
S. Asadi, A. Barekat, L. Guaita, I. A. Gumus, S. Lindgren, J.
Lindkvist, K. Migotto, A. Razza,
T. Str�m, F. Taddia, G. Olofsson (Stockholm Observatory), report on
behalf of a larger
collaboration:
We observed the field of GRB 110520A (De Pasquale et al., GCN 12020)
with the
Nordic Opitcal Telescope (NOT) equipped with ALFOSC. We obtained 3x600 s
R-band and 6x300 s I-band images. Observations started at 21:19:16.9 UT
on May 20 (i.e., 0.8414 hr after the burst).
An optical source is clearly detected in each of the stacked R-band
and I-band images
at coordinates
RA(J2000) = 08:57:21.84
Dec(J2000) = +56:25:40.2
Error-radius: ~0.1 arcsec
which is 2.7 arcsec away of the XRT position center reported at
http://www.swift.ac.uk/sper/index.php.
This source has R~23.7 mag at a median time 1.118 hrs post-burst,
calibrated with the
#1464-0205280 star (R1=18.97, R2=18.92) in the USNO B1 catalog. At the
moment
our data does not allow to test for variability of the source.