[vsnet-grb-info 10596] GRB 110520A - NOT optical observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat May 21 10:13:58 JST 2011
TITLE: GCN CIRCULAR
NUMBER: 12025
SUBJECT: GRB 110520A - NOT optical observation
DATE: 11/05/21 01:13:53 GMT
FROM: Steve Schulse at U. of Iceland <steve at 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. Ström, 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.
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