[AAVSO-HEN] GRB 090607: GRAS001 optical observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
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TITLE:   GCN CIRCULAR
NUMBER:  9493
SUBJECT: GRB 090607: GRAS001 optical observations
DATE:    09/06/07 09:00:11 GMT
FROM:    Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen at kassiopeia.net>

Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus
Hill Observatory) report:

We used Global-rent-a-scope GRAS001 Tak Mewlon 0.30m telescope with FLI 
IMG1024 Dream Machine at RAS Observatory Mayhill H06 (New Mexico, USA) 
for follow-up observations of GRB090607 (F. E. Marshall et al., GCN 9491).
The observations were started on June 7, at 06:11 UTC (1.0 hours after the
burst) and stopped on June 7, at 07:12 UTC. Three unfiltered 120s and two
unfiltered 600s images were taken. We did not find any new object in the
XRT error circle. Upper limit for the observations is >18.5 mag (3UL).
Quoted upper limit has been derived using POSSII J and USNO-B1.0 field 
stars as reference.

Filter          Tmid(s)       Exp(s)     Mag (CR) USNO-B1.0

unfiltered         07:01:32      2x600      >18.5