GCN Circular 78
Subject
GRB980519 optical observations
Date
1998-05-20T02:46:49Z (27 years ago)
From
Jens Hjorth at NORDITA <jens@nordita.dk>
The Nordic Optical Telescope GRB team (A. O. Jaunsen, J. Hjorth, M. I. Andersen,
K. Kjernsmo, H. Pedersen, E. Palazzi) reports the detection at the 2.5-m NOT of
an unresolved (in seeing of 1.5"-2"), variable object located within the
BeppoSAX error box of GRB 980519 (GCN #75).
The coordinates (+- 0.5") are
RA(2000) = 23 22 21.46
Dec(2000) = +77 15 43.0
The object had an I magnitude of about 19.5 on May 19.87 UTC but is not
detected in the DSS while objects of similar magnitude are. The OT had
faded by about 0.6 mag in V and I on May 20.0 UTC.
These observations suggest that the OT is the optical counterpart of GRB 980519.
Preliminary Cousins I photometry (+-0.1 mag, not corrected for extinction) of
4 nearby reference stars yields
RA(2000) Dec(2000) I
A 23 22 17.74 +77 15 51.2 19.04
B 23 22 27.29 +77 15 43.5 19.49
C 23 22 28.50 +77 15 25.4 18.52
D 23 22 47.14 +77 16 23.5 15.69
On this system the OT had I=20.08 on May 20.00 UTC
Finding charts, images and updates will be posted at
http://www.uio.no/~ajaunsen/grb980519
This note can be cited.