TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5424
SUBJECT: GRB 060807: afterglow confirmation
DATE:    06/08/08 10:46:49 GMT
FROM:    Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani@sissa.it>

D. Malesani (SISSA), J. Fynbo (DARK/NBI), S. Piranomonte (INAF/OAR), & 
A. Djupvik (NOT), report:

We have performed relative photometry between the NOT (Fynbo et al., GCN 
5420) and VLT (Malesani et al., GCN 5422) R-band images of GRB 060807 
(De Pasquale et al., GCN 5409).

We find that the object indicated by Fynbo et al. (GCN 5420) dimmed by 
0.61 +- 0.06 mag between 6.69 and 8.93 hr after the GRB. This confirms 
that the object was indeed the optical afterglow of GRB 060807. Assuming 
a power-law time dependence F(t) propto t^-alpha, the inferred decay 
index is quite steep: alpha = 1.9 +- 0.2.

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