GCN Circular 5979
Subject
GRB 061222A: MITSuME Akeno optical upper limits
Event
Date
2006-12-24T23:19:43Z (19 years ago)
From
Nobuyuki Kawai at Tokyo Tech <nkawai@hp.phys.titech.ac.jp>
T. Ishimura, Y. Yatsu, T. Shimokawabe, N. Vasquez, and N. Kawai (TokyoTech)
report on behalf of the MITSuME collaboration:
We observed the error box of GRB061222A (Grupe et al., GCN 5954)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting
at 8:48:53 UT, 5.3 hours after the trigger.
In the co-added images of Ic, Rc, and g' bands, we did not detect
any new source 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 Exp(s) Mag (3-sigma upper limit)
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Ic 8:48:53 09:32:23 60s * 36 19.6
Rc 8:48:53 09:32:23 60s * 36 20.4
g' 8:48:53 09:32:23 60s * 36 20.6
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