GCN Circular 11272
Subject
GRB 100909A: Swift/UVOT observations
Date
2010-09-10T21:19:23Z (14 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <mdp@mssl.ucl.ac.uk>
M. De Pasquale (MSSL-UCL) and M. H. Siegel (PSU) report, on behalf
of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of
GRB 100909A 11747 s after the INTEGRAL trigger (Mereghetti et
`al.,GCN Circ. 11260). Data summed from the first and second orbits
do not reveal a source at the enhanced position of the X-ray
afterglow (Gelbold et al., GCN Circ. 11268).
The 3-sigma upper limits f are reported below:
FILTER T_start(s) T_stop Exposure Mag/3UL
========================================================
wh 11747 25861 1809 >21.9
v 14755 18362 894 >20.21
b 11906 44659 1770 >21.48
u 33619 34527 885 >20.84
w1 19275 20040 752 >20.39
w2 13732 14301 561 >20.33
=======================================================
The above magnitudes are not corrected for the strong Galactic
extinction corresponding to a reddening of E_{B-V} = 0.51 (Schlegel
et al., 1998, ApJS, 500, 525). The photometry is on the UVOT
photometric system described in Poole et al. (2008, MNRAS, 383, 627).