GCN Circular 473
Subject
GRB 991216, Optical Transient
Date
1999-12-17T16:54:09Z (25 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO), C. Luginbuhl, F. Vrba, H. Harris,
B. Canzian, J. Munn, S. Levine, H. Guetter (USNO), D. H.
Hartmann (Clemson Univ.), M.C. Jennings (IGPP, UCR visitor)
report:
We confirm the fading optical source identified by
Halpern, et. al (GCN 472). Accurate position from
a large set of USNO-A2.0 reference stars is
05:09:31.29 +11:17:07.4 (J2000)
(internal error +/- 0.1arcsec)
R-band observations, referenced to the star at
05:09:39.30 +11:16:59.5 (J2000)
UT r telescope
0409 3.54 1.0-m
0511 3.81 1.3-m
0702 3.87 1.3-m
with photometric errors around 0.05mag. It has
been non-photometric here for the past few weeks,
but as soon as the weather improves, we will calibrate
this field in UBVRI.
We have additional R-band and V-band data, and
will be observing this field again this evening.
Our infrared camera went on the 1.55-m this
morning, so we may attempt H-band observations
as well.