GCN Circular 11861
Subject
GRB 110402A: PAIRITEL NIR Upper Limits
Date
2011-04-02T06:02:36Z (13 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
A. N. Morgan, C. R. Klein, and J. S. Bloom (UC Berkeley) report:
We observed the field of GRB 110402A (Ukwatta et al., GCN 11857) with
the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began
at 2011-04-02 04:28:41 UT, ~4.26 hours after the Swift Trigger. In
mosaics (effective exposure time of 0.63 hours) taken simultaneously
in the J and H filters, we do not detect any source at the optical
afterglow location (Mundell et al., GCN 11858, Leloudas et al., GCN
11859). Our preliminary Ks band reduction is corrupted.
The preliminary photometry yields:
post burst
t_mid (hr) exp.(hr) filt U. Limit (3 sig)
4.77 0.63 J > 19.1
4.77 0.63 H > 18.2
Further observations are ongoing to obtain a deeper limit. All
magnitudes are given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values.