GCN Circular 6554
Subject
GRB070616: Optical Observation by MITSuME Akeno
Event
Date
2007-06-18T06:36:35Z (18 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, Y.kudo, and
N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the error box of GRB070616 (Starling et al. GCN 6542)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting
at 16:52:26 June 16 UT, 22m53s after the trigger under a poor sky
condition with clouds and a high airmass.
In the co-added images of Ic, Rc, and g' bands, we did not detect
any afterglow candidate in the XRT error circle. The 3-sigma limiting
magnitudes based on USNO-B1.0 (I-band) and NOMAD (R-band,g'-band)
stars are following.
Filter start time end time Exposure Mag (3-sigma upper limit)
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g' 16:52:26 18:03:39 58 x 60 s 17.8
Rc 16:52:26 18:03:39 58 x 60 s 19.1
Ic 16:52:26 18:03:39 58 x 60 s 18.6
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