[vsnet-grb-info 12688] GRB 121209A: PAIRITEL NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14047
SUBJECT: GRB 121209A: PAIRITEL NIR Observations
DATE:    12/12/10 03:07:55 GMT
FROM:    Adam Morgan at U.C. Berkeley  <qmorgan at gmail.com>

A. N. Morgan (UC Berkeley) reports:

We observed the field of GRB 121209A (Maselli et al., GCN 14045) with the
1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at
2012-Dec-10 01h16m41s UT, ~3.2 hours after the Swift trigger.  In  mosaics
(effective exposure time of 1940 s) taken simultaneously in the J, H, and
Ks filters, we do not detect any source within the XRT error circle.

post burst
t_mid (hr) exp.(hr) filt  U. Limit (3 sig)
3.68      0.54     J     > 18.1
3.68      0.54     H     > 17.2
3.68      0.54     Ks    > 16.2


All magnitudes are given in the Vega system, calibrated to 2MASS. No
correction for Galactic extinction has been made to the above reported
values.