[AAVSO-HEN] GRB 080503: MITSuME Akeno optical upper limits

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  7668
SUBJECT: GRB 080503: MITSuME Akeno optical upper limits
DATE:    08/05/03 16:35:16 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai at hp.phys.titech.ac.jp>

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
----------------------------------------------------