GCN Circular 8829
Subject
GRB 090118: KPNO 4m Detection of Candidate Afterglow
Event
Date
2009-01-19T21:29:12Z (18 years ago)
From
Adria C. Updike at Clemson U <aupdike@clemson.edu>
Adria C. Updike and Dieter H. Hartmann (Clemson University) report:
Using the KPNO 4m telescope and the NEWFIRM instrument, we observed the
field of GRB 090118 (GCN 8825, Copete et al.) beginning 11.6 hours after
the burst in the J and H bands. Within the XRT error circle (Rowlinson &
Page, GCN 8828) we detect a faint source at coordinates
RA 03:19:18.6
Dec +18:24:54.3
Variability has not been confirmed. Further observations are planned.
Time after burst Band Magnitude
-------------------------------------------
11.6 hours J 21.0 +/- 0.5
12.5 hours H 20.2 +/- 0.4
A total of 40 minutes of exposures were taken in each band and the results
were stacked. Magnitudes are calibrated to the 2MASS point source catalog
and against a nearby star (RA 03:19:16.7, Dec +18:25:14, J = 14.05). No
correction has been made for galactic extinction.