GCN Circular 13211

Subject

GRB 120404A: MITSuME Akeno Optical upper limits

Event

GRB 120404A

Date

2012-04-04T14:51:25Z (14 years ago)

From

Yoichi Yatsu at Tokyo Tech. <yatsu@hp.phys.titech.ac.jp>

Y. Saito, Y. Aoki, S. Song, M. Hayashi, K. Kawakami, K. Tokoyoda,
R. Usui, Y. Yatsu, and N. Kawai (Tokyo Tech)  report on behalf of
the MITSuME collaboration:

We observed GRB 120404A (Stratta et al., GCN Circular 13208Loading...
 
 ) with the
optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME
50 cm telescope of Akeno Observatory, Yamanashi, Japan.

We started the observation 84 sec after the BAT trigger
from 2012-04-04 12:52:24.8 UT.  And we did not find any new point source
within the XRT error circle in the three bands.
The results of photometry (3sigma upper limits) are listed below.

The photon flux were calibrated against GSC2.3 catalog.

T0+[sec]      MID-UT     T-EXP[sec]       g'              Rc           Ic
----------------------------------------------------------------------------------------------------
   219         12:54:40          270           > 15.4       > 16.1     > 16.7
----------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]