[vsnet-grb-info 17412] GRB 160104A: MITSuME Okayama Ks-band upper-limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18819
SUBJECT: GRB 160104A: MITSuME Okayama Ks-band upper-limit
DATE:    16/01/04 14:10:03 GMT
FROM:    Kenshi Yanagisawa at OAO/NAOJ  <yanagi at 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 160104A (Melandri et al., GCN 18815)
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 11:46 UT on 4th January, 0.38h after
the BAT trigger, to 12:49 UT. The total exposure of 24.0 min
was successfully obtained.

In our co-add image, we did not find any new point source within
the XRT error circle down to the limiting magnitude of
Ks=16.8 (Vega, S/N=3). The photometric calibration was made
against 2MASS field stars.

T0+[sec]    MID-UT     T-EXP[sec]      Ks
---------------------------------------------------
  +3,235    12:18      1440.0          >16.8
---------------------------------------------------
T0+ : Elapsed time after the burt [sec]
T-EXP: Total Exposure time [sec]