GCN Circular 20892
Subject
GRB 170317A: MITSuME Okayama Ks-band upper-limit
Date
2017-03-17T16:39:39Z (7 years ago)
From
Kenshi Yanagisawa at OAO/NAOJ <yanagi@oao.nao.ac.jp>
K. Yanagisawa, D. Kuroda, Y. Shimizu, H. Izumiura (OAO/NAOJ),
M. Yoshida (Hiroshima), K. Ohta(Kyoto) and N. Kawai (Tokyo Tech.)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 170317A (LaPorte et al., GCN 20885)
in Ks-band with a wide-field near infrared imager at Okayama
Astrophysical Observatory (Japan). The imager has effective
aperture of 0.91 m.
Observations started from 09:54 UT on 17th March, 8 min after
the BAT trigger, to 10:38 UT. The total exposure of 17.0 min
was successfully obtained.
In our co-add image, we did not find any new point source within
the XRT error circle (Beardmore et al., GCN 20887) down to
the limiting magnitude of Ks=16.1 (Vega, S/N=5). The photometric
calibration was made against 2MASS field stars.
T0+[sec] MID-UT T-EXP[sec] Ks
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+1,819 10:16 1020.0 >16.1
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T0+ : Elapsed time after the burt [sec]
T-EXP: Total Exposure time [sec]