GCN Circular 8995
Subject
GRB 090313 - PAIRITEL NIR detections
Event
Date
2009-03-14T06:35:06Z (17 years ago)
From
Adam Morgan at PSU/Swift-UVOT <qmorgan@gmail.com>
A. N. Morgan, J. S. Bloom, D. A. Perley (UC Berkeley), and D. Starr
(UCB, LCOGT) report:
We observed the optical afterglow of GRB 090313 (Mao et al. 2009, GCN
8980) with PAIRITEL beginning at 2009-03-13 09:39 UT, 31 minutes after
the Swift Trigger. We detect the afterglow (Chornock et al., GCN
8979) in all 111 47-second mosaics of 7.8 second simultaneous
exposures in the J, H, and Ks taken throughout the night.
Preliminary lightcurves indicate a shallowing of the temporal decay
rate during the 3.5 hours over which the afterglow was observed. The
preliminary photometry yields:
post_burst
t_mid (hr) exp(s) filt mag merr
0.941 1883 J 14.7 0.1
0.941 1883 H 13.8 0.1
0.941 1883 K 12.8 0.1
2.302 2331 J 15.6 0.1
2.302 2331 H 14.6 0.1
2.302 2331 K 13.8 0.1
3.512 1860 J 15.9 0.1
3.512 1860 H 15.4 0.1
3.512 1860 K 14.1 0.1
No correction for Galactic extinction has been made to the above
reported values. Further observations are being taken tonight.