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GCN Circular 6366

Subject

Swift/UVOT observations of GRB070429B

Date

2007-04-29T17:03:42Z (17 years ago)

From

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

P. Schady (MSSL/PSU) and C. Markwardt (GSFC/UMD) report on behalf of the 
Swift UVOT team:

Swift/UVOT observed the field of GRB 070429B starting 297s after the BAT 
trigger. No new source is detected either within the refined XRT position 
(GCN 6360Not found
 
 
) 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(s) Exp.(s) Mag 3-sig UL
White    1009    302     19.68
V        1489    605     19.64
B        1812    184     19.83
U        2092    392     19.80
UVW1     1625    253     19.31
UVM2     1601    253     19.48
UVW2     1682    214     19.63

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) = 0.03 mag.