GCN Circular 6364

Subject

Swift/UVOT observations of GRB070429A

Event

Date

2007-04-29T16:19:44Z (19 years ago)

From

Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>

P. Schady (MSSL/PSU) and J. Cannizzo (GSFC/UMBC) report on behalf of 
the Swift UVOT team:

Swift/UVOT observed the field of GRB 070429A starting 211s after the 
BAT trigger. No new source is detected either within the refined XRT 
position (GCN 6363Loading...
 
 ) or at the position reported by Ugarte Postigo et 
al. (GCN 6361Loading...
 
 ) in any of the UVOT filters, in either single or co-added 
exposures. The 3-sigma upper limits for the co-added exposures in each 
filter are as follows:

Filter        T_mid       Exp.     Mag 3-sig UL
                      (s)           (s)
White       850          253      19.43
V               1104       903      19.75
B               1700       107      19.30
U               1598       117      18.96
UVW1      3535        259     19.19
UVM2       3951       333     19.61
UVW2      1659        117     19.07

where T_mid is the weighted mid time of the co-added images. The 
reported upper limits are uncorrected for the estimated Galactic 
reddening of E(B-V) = 0.17 mag.