[vsnet-grb-info 20638] GRB 180514A: MITSuME Ishigakijima optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22736
SUBJECT: GRB 180514A: MITSuME Ishigakijima optical upper limits
DATE:    18/05/17 01:11:15 GMT
FROM:    Ryosuke Itoh at Tokyo Institute of Tech.  <itoh at hp.phys.titech.ac.jp>

T. Horiuchi,  H. Hanayama, M. Honma (IAO, NAOJ),
R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita, T. Ozawa, H. Mamiya,
K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 180514A
(LaPorte et al., GCN Circular #22723, Volnova et al., GCN Circular #22735)
with the optical three color (g', Rc, and Ic) CCD cameras attached to
the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.


The observation started on 2018-05-14 13:46:55 UT.
We did not find any point source at the position of the XRT error
circle in all three bands. We obtained following limits for the magnitudes.

T0+[min]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~21.4      14:18:37  3,300   >19.6   >19.2   >17.2
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.