[vsnet-grb-info 7713] GRB 090426: Near infrared observation with ISLE at OAO

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9267
SUBJECT: GRB 090426: Near infrared observation with ISLE at OAO
DATE:    09/04/26 23:50:04 GMT
FROM:    Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida at oao.nao.ac.jp>

M. Yoshida, D. Kuroda, K. Yanagisawa, Y. Shimizu, S. Nagayama,
H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf
of the MITSuME collaboration:

We detected the optical afterglow of GRB 090426 (Cummings et al.
GCN 9254; Xin et al. GCN 9255; Oates et al. GCN 9265; Yoshida et
al. GCN 9266) in near-infrared bands with the near-infrared
camera ISLE attached to the 188cm telescope of Okayama
Astrophysical Observatory.

Photometric results are listed below. We used 2MASS stars in the
FOV of ISLE for flux calibration.

Band   #PDAY     MID-UT   T-EXP   mag   error
----------------------------------------------
J      0.03534  13:39:41  720.0   18.6   0.2
H      0.03960  13:45:49  720.0   18.0   0.2
Ks     0.04336  13:51:13  720.0   17.6   0.2
----------------------------------------------