GCN Circular 319
Subject
GRB 990510, BVI photometry
Date
1999-05-12T12:47:54Z (26 years ago)
From
Andrzej Udalski at Warsaw U. Observatory <udalski@sirius.astrouw.edu.pl>
G. Pietrzynski and A. Udalski (Warsaw University Observatory) report on
behalf of the OGLE microlensing survey team:
Observations of the optical counterpart of GRB 990510 collected with the
1.3-m Warsaw telescope at the Las Campanas Observatory (Chile) on May
11/12, 1999 indicate that the object faded smoothly to V=21.2 and I=20.3
on May 12.4 UT.
Single observation in the B-band collected on May 11.3607 UT yields the
following colors of the GRB990510 counterpart: B=20.47+/-0.05,
B-V=0.54+/-0.06 and V-I=0.88+/-0.04. This indicates significantely
different spectral distribution as compared to regular stars.
The nearby galaxy, mentioned by Kaluzny et al 1999 GCN #314, is clearly
visible on collected frames.
Updated photometry of the optical counterpart of GRB 990510 and light
curves are available from the OGLE Internet archive:
http://www.astrouw.edu.pl/~ftp/ogle
[GCN OP NOTE (12May99): Due to a problem in processing this Circular,
the NUMBER was erroneously assigned to be 318, when in fact it
should have been 319. The archive copies have been fixed.]