GCN Circular 12760
Subject
GRB 111228A: PAIRITEL NIR Detection
Event
Date
2011-12-29T08:18:18Z (14 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
GRB 111228A: PAIRITEL NIR Detection
A. N. Morgan (UC Berkeley) reports:
We observed the field of GRB 111228A (Ukwatta et al., GCN 12737) with
the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began
at 2011-12-29 06:55:25 UT, ~15.2 hours after the Swift Trigger. In
mosaics (effective exposure time of 0.46 hours) taken simultaneously
in the J, H, and Ks filters, we marginally detect a source at the
optical afterglow location (Ukwatta et al., GCN 12737; Xin et al., GCN
12738; Klotz et al., GCN 12742; Pandey et al., GCN 12745; Nascimbeni
et al., GCN 12748; Xu et al. GCN 12750; Nysewander et al., GCN 12751;
Kuin & Ukwatta, GCN 12752; Gorosabel et al., GCN 12753; Hentunen et
al., GCN 12754; Sinykov et al., GCN 12756; Guelbenzu et al., GCN
12757).
The preliminary photometry yields:
post burst
t_mid (hr) exp.(hr) filt mag m_err
15.56 0.46 J 18.3 0.2
15.56 0.46 H 17.8 0.3
15.56 0.46 Ks 16.2 0.3
All magnitudes are given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values. Further observations are ongoing.