GCN Circular 5977
Subject
GRB 061222B: MITSuME Akeno optical upper limits
Date
2006-12-24T15:32:47Z (18 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 (Tokyo
Tech) report on behalf of the MITSuME collaboration:
We observed the error box of GRB061222B (Racusin et al., GCN 5957)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at
12:52:28 UT, 8.7 hours after the trigger.
In the co-added images of Ic, Rc, and g' bands, we did not detect
the afterglow (Berger, GCN 5956). 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 12:52:28 13:29:50 60s * 29 18.3
Rc 12:52:28 13:29:50 60s * 29 19.7
g' 12:52:28 13:29:50 60s * 29 19.4
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