[vsnet-grb-info 4650] GRB 070509: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri May 11 01:00:43 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6404
SUBJECT: GRB 070509: Swift/UVOT Upper Limits
DATE: 07/05/10 16:00:38 GMT
FROM: Stephen Holland at USRA/NASA/GSFC/SSC <sholland at milkyway.gsfc.nasa.gov>
S. T. Holland (CRESST/GSFC/USRA) and L. Vetere (PSU)
report on the behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 070509 starting 73 s
after the BAT trigger (Vetere et al. 2007, GCN Circ. 6394). We do
not find any source, in any of the UVOT observations, inside the
refined XRT error circle (Vetere et al., 2007 GCN Circ. 6400).
The 3-sigma upper limits for detecting a source anywhere inside
the refined XRT error circle in the co-added frames are:
Filter T_start T_stop Exp(s) Mag (3-sigma upper limit)
-----------------------------------------------------------------
V 179 6074 1003 20.6
B 657 1468 39 18.6
U 633 1443 58 18.4
UVW1 609 1419 58 18.0
UVM2 584 6085 65 17.5
UVW2 686 5869 236 19.3
White 73 1482 225 21.1
-----------------------------------------------------------------
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.14 mag towards
the direction of the burst (Schlegel et al. 1998).
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