[vsnet-grb-info 10982] GRB 110928A: Further PAIRITEL NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12400
SUBJECT: GRB 110928A: Further PAIRITEL NIR Observations
DATE:    11/09/28 04:28:47 GMT
FROM:    Adam Morgan at U.C. Berkeley  <qmorgan at gmail.com>

A. N. Morgan, C. R. Klein and J. S. Bloom (UC Berkeley) report:

We observed the field of GRB 110928A (Hoversten et al., GCN 12394)
with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations
began at 2011-Sep-28 02h03m59s UT, ~12.5 min after the Swift trigger.
In  mosaics (effective exposure time of 678.6 s) taken simultaneously
in the J, H, and Ks filters, we do not detect any source within the
XRT error circle (Evans et al. GCN 12398).

post burst
t_mid (hr) exp.(hr) filt  U. Limit (3 sig)
0.36      0.19     J     > 18.2
0.36      0.19     H     > 17.5
0.36      0.19     Ks    > 15.9


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