[vsnet-grb-info 4453] GRB 070328: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Mar 29 05:18:18 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6229
SUBJECT: GRB 070328: Swift/UVOT Upper Limits
DATE: 07/03/28 20:18:13 GMT
FROM: Frank Marshall at GSFC <marshall at milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and C.B. Markwardt (GSFC/UMD) report
on behalf of the Swift UVOT team:
Swift/UVOT began its initial finding chart exposure of the
field of GRB 070328 (Markwardt et al. 2007, GCN Circ. 6224)
98 s after the Swift/BAT trigger. No afterglow candidate is seen
in the refined XRT error region (Evans et al. 2007, GCN Circ. 6227)
in any of the early UVOT exposures. Three-sigma upper limits
for the initial finding chart exposure and for the total exposure
for each of the UVOT filters are provided below. The times
in the table are from the Swift/BAT trigger.
Filter t_start(s) t_stop(s) Exp(s) Mag 3-sig UL
WHITE 98 198 98 19.6
WHITE 98 6984 567 21.1
V 79 11988 1721 20.7
B 682 6823 397 20.8
U 657 6619 429 20.4
UVW1 634 6414 432 20.7
UVM2 609 12770 1197 21.6
UVW2 711 11076 1101 21.5
These upper limits are not corrected for extinction.
The Galactic reddening in the direction of the burst is
E_{B-V} = 0.04 mag (Schlegel et al. 1998).
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