GCN Circular 8504

Subject

GRB 081109: Swift/UVOT upper limits

Event

Date

2008-11-09T15:18:19Z (17 years ago)

From

Paul Kuin at MSSL <npkuin@googlemail.com>

N. P. M. Kuin (MSSL/UCL) and S. Immler (CRESST/GSFC/UMD)
report on behalf of the Swift UVOT team.

The Swift UltraViolet/Optical Telescope (UVOT) began observing
GRB 081109 (Swift BAT trigger number 334112; Immler et al.,
GCN Circ. 8500Loading...
 
 ) on November 9, 2008, with a white filter finding
chart at 07:03:23 UT, 75 seconds after the trigger.

No new source is detected in any of our images at the position
consistent with the reported XRT position in GCN Circ. 8500Loading...
 
 .

The magnitudes and upper limits for GRB081109 at this position
are given below:

Filter Tstart(s) Tstop(s)  Exp(s)  Magnitude

wh      75       6592     745      >21.49  (3-sigma UL)
u      287       6181     501      >20.57  (3-sigma UL)
b      543       6387     452      >20.35  (3-sigma UL)
uvw2   593       5362     274      >20.03  (3-sigma UL)
v      617       5566     274      >19.09  (3-sigma UL)
uvm2   641       5771     274      >19.87  (3-sigma UL)
uvw1   666       5976     255      >20.00  (3-sigma UL)

The values quoted above are on the UVOT Photometric System
(Poole et al, 2008, MNRAS 383, 627). They are not corrected for
the expected galactic reddening of E(B-V) = 0.019 in the direction
of the burst (Schlegel et al. 1998).