GCN Circular 12731
Subject
GRB 111225A: PAIRITEL NIR Upper Limits
Date
2011-12-26T06:06:41Z (12 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
A. N. Morgan (UC Berkeley) reports:
We observed the field of GRB 111225A (Siegel et al., GCN 12720) with
the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began
at 2011-12-26 01h13m05 UT, ~21.35 hr after the Swift Trigger. In
mosaics taken simultaneously in the J, H, and Ks filters, we do not
detect the optical afterglow (Siegel et al., GCN 12720; Klotz et al.,
GCN 12722; Updike et al., GCN 12723; Xin et al., GCN 12725; Gorosabel
et al., GCN 12728).
The preliminary photometry yields:
post burst
t_mid(h) exp.(s) filt U. Limit (3 sig)
22.45 4774 J > 18.4
22.45 4774 H > 17.6
22.45 4774 Ks > 16.9
All magnitudes are given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values.