[vsnet-grb-info 14853] GRB 140423A: Nishi-Harima NIR Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16167
SUBJECT: GRB 140423A: Nishi-Harima NIR Observations
DATE:    14/04/24 13:44:50 GMT
FROM:    Akira Arai at Nishi-Harima Astro. Obs/U of Hyogo  <arai at nhao.jp>

J. Takahashi and A. Arai (Univ. of Hyogo)
report on behalf of the Nayuta team and the OISTER collaboration:

We observed the field of GRB 140423A (Sonbas et al., GCN 16142)
with Nishiharima Infrared Camera (NIC) attached to the Nayuta 2-m
telescope at the Nishi-Harima Astronomical Observatory.

The observations were conducted on 2014-04-23 at 10:05-10:29 UT and
13:03-13:53 UT.
We detected the near-infrared afterglow in H and Ks bands.

Photometric results of our observations are listed below.
We used 2MASS 13085994+4951082 as a reference star for photometry.

# MID-UT   Tmid-T0 T-EXP  H_mag   Ks_mag*
-----------------------------------------------------------------------
10:17:20   1.76    300    17.0 +/- 0.2 16.6 +/- 0.2
10:25:50   1.90    300    17.2 +/- 0.2 16.6 +/- 0.2
13:11:00   4.65    480    17.7 +/- 0.2 17.1 +/- 0.3
13:27:16   4.93    480    17.7 +/- 0.2  --**
13:44:50   5.22    600    17.7 +/- 0.2  17.3 +/- 0.3
------------------------------------------------------------------------
Tmid-T0: Elapsed time after the burst (hours)
T-EXP: Total Exposure time (seconds)
* 2MASS Ks error for the reference star is not given, and thus it is
not included in our error estimates for the GRB afterglow,
** Photometry was not possible.