GCN Circular 8504
Subject
GRB 081109: Swift/UVOT upper limits
Date
2008-11-09T15:18:19Z (15 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. 8500) 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. 8500.
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).