GCN Circular 14408
Subject
GRB 130420A: PAIRITEL NIR detections
Date
2013-04-20T08:16:50Z (11 years ago)
From
Adam Morgan at U.C. Berkeley <qmorgan@gmail.com>
A. N. Morgan (UC Berkeley) reports:
We observed the field of GRB 130420A (Page et al., GCN 14406) with the 1.3m
PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2013-Apr-20
07h37m23s UT, 8.9 minutes after the Swift Trigger. In mosaics (effective
exposure time of ~10 minutes) taken simultaneously in the J, H, and Ks
filters, we detect the optical afterglow (Guidorzi et al., GCN 14405; Page
et al., GCN 14406; Guver et al., GCN 14407).
The preliminary photometry yields:
post burst
t_mid (hr) exp.(m) filt mag m_err
0.28 9.75 J 15.59 0.05
0.28 9.75 H 14.99 0.07
0.28 9.75 Ks 14.13 0.12
Observations are ongoing. All magnitudes are given in the Vega system,
calibrated to 2MASS. No correction for Galactic extinction has been made to
the above reported values.