[vsnet-grb-info 4679] GRB 070520A: MITSuME Akeno optical upper limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon May 21 13:19:56 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6430
SUBJECT: GRB 070520A: MITSuME Akeno optical upper limits
DATE: 07/05/21 04:19:51 GMT
FROM: Nobuyuki Kawai at Tokyo Tech <nkawai at hp.phys.titech.ac.jp>
T. Ishimura, T. Shimokawabe, N. Vasquez, Y. Yatsu, Y. Kudou and
N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB070520A (Romano et al., GCN 6423)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting
at 13:15:15 UT, 10 min after the trigger, under a clear, but windy
condition.
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 UL)
-----------------------------------------------------------
Ic 13:15:15 15:06:06 60s * 91 20.3
Rc 13:15:15 15:06:06 60s * 91 21.2
g' 13:15:15 15:06:06 60s * 91 21.1
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