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GCN Circular 14047

GRB 121209A: PAIRITEL NIR Observations
2012-12-10T03:07:55Z (12 years ago)
Adam Morgan at U.C. Berkeley <>
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
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