[vsnet-grb-info 9754] GRB 100905A: UKIRT zJHK Observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Mon Sep 6 13:55:07 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 11222
SUBJECT: GRB 100905A: UKIRT zJHK Observation
DATE: 10/09/06 04:55:03 GMT
FROM: Myungshin Im at Seoul Nat U <mim at astro.snu.ac.kr>
Myungshin Im, Changsu Choi, Hyunsung Jun, Eugene Kang (CEOU/Seoul
National University), Y. Urata (NCU), P. Choi (Pomona College),
T. Sakamoto (NASA/GSFC), and N. Gehrels (NASA/GSFC) on behalf
of a larger collaboration
We observed GRB 100905A (Marshall et al. GCN 11214) in z, J, H,
and K filters using UKIRT. The observation started at Sept. 05,
15:22 UT or roughly 17 minutes after the BAT alert, until the
sunrise.
The reduced images with non-optimal calibration frames show
a "possible" very faint source within the XRT error circle
(Evans et al. GCN 11219) whose significance is only 2-3 sigma
in each image (2-sigma limit, J=19.8, H=19.0,
and K=18.7 mag). The faint smudge show up in all zJHK filter
images, suggesting this could be an afterglow, but we do not
exclude the possibility that this is just a spurious detection.
Further analysis of the UKIRT data is ongoing.
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