GCN Circular 10922
Subject
Swift/UVOT observations of GRB100702A
Event
Date
2010-07-02T13:37:35Z (16 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 100621A 101s
after the BAT trigger (Siegel et al, GCN 10916). The enhanced XRT error
circle appears crowded with sources (Malesani et al., GCN 10918, Fong et
al, GCN 10919) which blend together. There is no clear indication of
change of optical flux between the first exposures and later ones. The
preliminary magnitudes and 3-sigma upper limits for the finding chart
exposures (FC) and summed images for the emission in the XRT enhanced
error circle are:
Filter T_start T_stop Exp(s) Magnitude/3-sigma upper
limit
-------------------------------------------------------------
white (FC) 101 251 147 17.99 +/- 0.07
white 594 10684 1295 17.84 +/- 0.05
u (FC) 314 564 246 18.85 +/- 0.17
u 5020 5151 131 18.96 +/- 0.26
v 4405 17014 735 16.72 +/- 0.04
b 570 6306 216 17.79 +/- 0.08
uvw1 4815 5015 196 > 19.60
uvm2 4610 4810 197 > 19.40
uvw2 4200 16457 1432 > 20.85
-------------------------------------------------------------
The quoted upper limits have not been corrected for the expected Galactic
extinction along the line of sight corresponding to E_(B-V) = 0.41 mag.
All photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383, 627).