[vsnet-grb-info 7897] GRB 090515: PAIRITEL NIR Detections

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9440
SUBJECT: GRB 090515: PAIRITEL NIR Detections
DATE:    09/05/30 04:30:03 GMT
FROM:    Adam Morgan at U.C. Berkeley  <qmorgan at gmail.com>

A. N. Morgan, D. A. Perley,  J. S. Bloom,  (UC Berkeley),  and D.
Starr (UCB, LCOGT) report:

We observed the field of GRB 090530 (Cannizzo et al., GCN 9438) with
the 1.3-m PAIRITEL located at Mt Hopkins, Arizona.  Observations began
at 2009-05-30 03:19:30 UT, 72 seconds after the Swift Trigger.  We
detect the optical afterglow (Cannizzo et al., GCN 9438, Flewelling et
al., GCN 9439) in mosaics taken simultaneously in the J, H, and Ks
filters.

The preliminary photometry yields:

post_burst
t_mid (min) exp(s)  filt  mag   merr
8.33        424     J     16.4  0.1
8.33        424     H     15.4  0.1
8.33        424     Ks    15.0  0.1

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