[vsnet-grb-info 6038] GRB080503: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sun May 4 10:24:08 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 7675
SUBJECT: GRB080503: Swift/UVOT Upper Limits
DATE: 08/05/04 01:23:57 GMT
FROM: Peter Brown at PSU <pbrown at astro.psu.edu>
P. J. Brown (PSU) and J. Mao(INAF-OAB),
on behalf of the Swift/UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT)
began settled observations of GRB 080503 (trigger 310785)
84 seconds after the BAT trigger (Mao et al.,GCN Circ. 7639).
No afterglow is detected at the enhanced XRT position
(Goad et al., GCN Circ. 7665) in the initial white finding chart
or subsequent summed images. The limiting magnitudes
(3-sigma in 5" radius apertures) in each of the UVOT filters
are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig)
white 85 184 98 >20.0
white 85 12500 1314 >22.3
v 191 6749 1219 >20.5
b 671 11588 1203 >21.4
u 646 7365 471 >20.3
uvw1 622 7160 471 >20.4
uvm2 597 6954 471 >20.3
uvw2 701 13219 1133 >21.0
The values quoted above are in the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627). They are not corrected
for the expected Galactic extinction corresponding to a
reddening of E(B-V)=0.06 mag in the direction of the burst
(Schlegel et al. 1998).
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