[vsnet-grb-info 10619] GRB 110530A: MITSuME Akeno Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12048
SUBJECT: GRB 110530A: MITSuME Akeno Optical Observation
DATE:    11/05/30 16:54:31 GMT
FROM:    Yoichi Yatsu at Tokyo Tech.  <yatsu at hp.phys.titech.ac.jp>

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

We observed GRB110530A (D'Avanzo et al, GCN12046)
with the optical three color (g, Rc, and Ic) CCD camera attached
to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The follow-up observation was started at 15:31:02, ~2min after the BAT trigger.
And we detected a very faint object within the XRT error circle in R-band.
The measured R-band magnitude is shown below.

T0+[s]   MID-UT   T-EXP[sec]    g'             Rc           Ic
-----------------------------------------------------------------------
125    15:39:42          660           ---   18.84 +/- 0.65   ---
-----------------------------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]

Photometric results and are listed below. We used GSC2.3 catalog for
flux calibration.