GCN Circular 9094
Subject
Swift/UVOT observations of GRB090404
Event
Date
2009-04-05T12:56:40Z (17 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and H. Ziaeepour report on behalf of the Swift/UVOT
team:
The Swift/UVOT began observing the field of GRB 090404 96 s after the BAT
trigger (Ziaeepour et al., GCN Circ. 9086). No optical afterglow is
detected in the initial UVOT exposures at the refined position of the
X-ray afterglow (Beardmore et al., GCN Circ. 9088).
The 3 sigma upper limits for the finding chart (fc) and summed exposures
are reported below.
Filter T_start (s) T_stop Exposure Mag/3UL
---------------------------------------------------
white fc 96 246 147 < 20.92
white 591 1189 206 < 20.82
white 5121 18611 1084 < 21.80
u fc 310 559 246 < 20.17
u 715 1140 39 < 18.60
u 4710 35856 3049 < 21.56
v 641 1239 78 < 18.58
v 5531 11198 1150 < 20.37
b 565 1164 58 < 19.35
b 4915 35968 2078 < 21.50
uvw1 691 1116 39 < 18.45
uvw1 4504 45467 3237 < 21.47
uvm2 665 1091 58 < 18.54
uvm2 5736 41754 2695 < 21.42
uvw2 616 1214 78 < 19.09
uvw2 5326 6965 393 < 20.28
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.02 mag (Schlegel et al., 1998,
ApJS, 500, 525). The photometry is on the UVOT flight system described in
Poole et al. (2008, MNRAS, 383,627).