GCN Circular 18278

Kenshi Yanagisawa, Daisuke Kuroda, Yasuhiro Shimizu, Hideyuki
Izumiura (OAO/NAOJ), Michitoshi Yoshida (Hiroshima-U),
Kouji Ohta(Kyoto-U), and Nobuyuki Kawai(Tokyo Tech.) report
on behalf of the MITSuME collaboration:

We observed the field of GRB150910A (Pagani et al., GCNC 18264)
in Ks-band with a wide-field NIR camera at Okayama Astrophysical
Observatory (Japan). The camera has an effective aperture of 0.91m.

Observations started from 10:03 UT on 10th September, 59 min after
the BAT trigger, to 11:14 UT. The total exposure of 26 min was
successfully obtained.

In our co-add image, we found a single point source at
  R.A.(J2000) = 00:22:39.84
  DEC (J2000) = +33:28:20.5
with an uncertainty of of about 2 arcsec.

We estimate the magnitude Ks = 14.85 +/- 0.13 (Vega).
The calibration was made against 2MASS field stars.

T0+[min]    MID-UT     T-EXP[min]    Ks
------------------------------------------------------------
  +94       10:38        26          14.85 +/- 0.13 (Vega)
------------------------------------------------------------
T0+ : Elapsed time after the burst [min]
T-EXP: Total Exposure time [min]