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GCN Circular 7668

GRB 080503: MITSuME Akeno optical upper limits
2008-05-03T16:35:16Z (16 years ago)
Nobuyuki Kawai at Tokyo Tech <>
Y.A. Mori, Y. Kudou, T. Shimokawabe and N. Kawai (Tokyo Tech) report on
behalf of the MITSuME collaboration: 

We observed the error box of GRB 080503 (Mao et al. GCN 7665)
with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting
at 2008-05-03 12:31:53 UT, 5.4 min after the trigger.
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 (UT)  end (UT)    Exposure   LimitMag
g'      12:31:53    12:41:03    9 x 60 s     18.8
Rc      12:31:53    12:41:03    9 x 60 s     19.2
Ic      12:31:53    12:41:03    9 x 60 s     18.1
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