GCN Circular 10007
Subject
GRB 091010: Swift/UVOT Upper Limits
Event
Date
2009-10-10T21:54:59Z (17 years ago)
From
Peter Curran at MSSL <pac@mssl.ucl.ac.uk>
P.A. Curran (MSSL-UCL) and R. Margutti (INAF-OAB) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began ToO observations of the field of the SuperAGILE
detected GRB 091010 (Donnarumma et al., GCN 10004) on 2009 Oct 10 at
14:48:26 UT.
No optical afterglow consistent with the Swift XRT position (Margutti et
al., GCN 10006) is detected in the UVOT exposures. Preliminary 3-sigma
upper limits, using the UVOT photometric system (Poole et al. 2008, MNRAS,
383, 627), for the exposures are:
Filter Time(s) Exp(s) Mag
--------------------------------------
wh 4.41e4 498 >21.36
v 4.47e4 609 >19.86
u 4.35e4 567 >20.48
The values quoted above are not corrected for the Galactic extinction due
to the reddening of E(B-V) = 0.10 in the direction of the burst (Schlegel
et al. 1998).