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GCN Circular 2635

Subject
GRB 040730: Optical observations
Date
2004-07-31T00:54:27Z (20 years ago)
From
Javier Gorosabel at IAA-CSIC <jgu@iaa.es>
J. Gorosabel (IAA-CSIC), S. Eguchi (Univ. of Nagoya),
A.J. Castro-Tirado (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC),
P. Kilmartin (Univ. of Canterbury), P. Yock (Univ. of Auckland),
M. Jel�nek (IAA-CSIC) and J.M. Castro Cer�n (STScI) report:


"We have acquired two set of images of the GRB 040730 error box, provided
by INTEGRAL (Gotz et al. GCN 2634), with the 0.6 m telescope (+MOA camera)
at the Mt. John Observatory. The observations were performed with the MOA
broad R band filter (similar to Ic); individual exposure times were 300 s.
The two sets are composed of three images each (Texp = 3 x 300 s), the
first one taken on July 30.2992-30.3126 UT (t-to ~ 5.2 hr) and the second
one 30.5215-30.5349 UT (t-to ~ 10.7 hr). Visual comparison of the two
epochs did not reveal variable sources brighter than Ic ~ 20. We note 
the severe Galactic extinction in the GRB line of sight (A_I ~ 2.3 mag)."

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