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GCN Circular 6111

GRB 070219: Swift/UVOT Upper limits
2007-02-19T14:14:41Z (17 years ago)
Alice Breeveld at MSSL-UCL <>
A. Breeveld (MSSL/UCL) and T. Sakamoto (NASA/ORAU) report on behalf of
the Swift UVOT team:

The Swift/UVOT observed the field of GRB 070219 starting 68s after the
BAT trigger (Sakamoto et al. 2007, GCN Circ. 6104). We do not find any
source, in any of the UVOT observations, inside the XRT error circle.

The 3-sigma upper limits for detecting a source inside the XRT error
circle in the co-added frames are:

Filter    T_start    T_stop    Exp(s)    Mag(3-sigma UL)
V         68         18502     2032      20.3
B         670        6909      432       20.4
U         646        13201     980       20.4
UVW1      622        12659     1160      21.0
UVM2      598        18983     1627      21.5
UVW2      698        17588     1356      21.5
White     87         7114      618       20.7

The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.035 towards the
direction of the burst (Schlegel et al. 1998)
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