GCN Circular 3596
Subject
GRB050712: Swift UVOT Observation of Afterglow Emission
Date
2005-07-13T17:49:21Z (19 years ago)
From
Alexander Blustin at MSSL-UCL <ajb@mssl.ucl.ac.uk>
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T. Poole (MSSL), D. Grupe (PSU), A. Breeveld (MSSL),
L. Angelini (GSFC-JHU), J. Greiner (MPE) on behalf of the
Swift UVOT team
The Swift Ultra-Violet/Optical Telescope (UVOT) began
observations of GRB050712 (Grupe et al. GCN 3573; E.Rol
et al. GCN 3575) on 12th July 2005 at 14:02:58 UT. We detect
a source inside the XRT error circle (Falcone et al.
GCN 3574) in the V and U bands. It initially fades, then
brightens before fading below the detection threshold. It is
not detected in the UV filters. No B observations were taken
because of a bright source in the field of view violating the
UVOT count rate limits.
The aperture for optical observations (V and U) was 6 arcsec
and for the UV 12 arcsec. The limiting magnitudes are given
to a 3 sigma limit.
V filter
start exposure mid magnitude
time time time
after =09after
burst burst
(s) (s) (s)
164 100 214 17.97 =B1 0.09 - source detection
313 10 318 17.85 =B1 0.20 - source detection
383 10 388 18.69 =B1 0.20 - source detection
455 10 460 18.13 =B1 0.20 - source detection
526 10 531 18.04 =B1 0.20 - source detection
597 10 602 17.99 =B1 0.20 - source detection
668 49 693 17.83 - limiting magnitude
1207 100 1257 18.01 - limiting magnitude
11414 900 11864 22.15 - limiting magnitude
U filter
start exposure mid magnitude
time time time
after after
burst burst
(s) (s) (s)
282 10 287 17.92 =B1 0.20 - source detection
353 10 358 17.82 - limiting magnitude
425 10 430 17.75 - limiting magnitude
425 10 430 19.47 =B1 0.20 - source detection
496 10 501 18.16 =B1 0.20 - source detection
639 49 664 18.50 - limiting magnitude
996 100 1051 18.74 - limiting magnitude
6477 663 6809 19.83 - limiting magnitude
UVW1
start exposure mid magnitude
time time time
after after
burst burst
(s) (s) (s)
268 107 322 18.49 - limiting magnitude
1970 833 2387 19.62 - limiting magnitude
UVM2 - limiting magnitudes
start exposure mid magnitude
time time time
after after
burst burst
(s) (s) (s)
325 98 374 19.05 - limiting magnitude
1310 46 1333 18.36 - limiting magnitude
4663 1447 723 20.36 - limiting magnitude
UVW2 - limiting magnitudes
start exposure mid magnitude
time time time
after after
burst burst
(s) (s) (s)
298 98 347 19.05 - limiting magnitude
1102 100 1152 20.15 - limiting magnitude
10447 900 10897 21.57 - limiting magnitude
We caution that the instrument is not yet fully calibrated and that the
magnitude limits presented here may need to be refined.
This message may be cited.
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