GCN Circular 4041
Subject
GRB050922C - Swift UVOT preliminary analysis
Event
Date
2005-09-26T21:13:03Z (20 years ago)
From
Caryl Gronwall at PSU/Swift-UVOT <caryl@astro.psu.edu>
S. D. Hunsberger (PSU), F. Marshall (GSFC), S. T. Holland (GSFC),
P. Brown (PSU), A. Morgan (PSU), P. Roming (PSU), and
A. Cucchiara (PSU) on behalf of the Swift/UVOT teams
The UVOT began observing GRB050922C at 19:57:41UT, 111 seconds
after the BAT trigger (Norris et al., GCN 4013). A fading
optical counterpart is detected at 21:09:33.0 -08:45:30.1. The
afterglow is apparent in the UBV filters and there is a marginal
detection in UVW1 which is likely due to the redward edge of the
filter response overlapping the U bandpass. The UVOT magnitudes
listed below are not corrected for extinction. Tmid is the time
since trigger of the midpoint of the exposure(s).
Filter Tmid(s) Exp(s) Mag
V 115.5 99.8 14.60 +- 0.10
V 374.5 9.8 15.49 +- 0.17
V 543.5 9.8 15.99 +- 0.21
V 712.5 9.8 16.01 +- 0.21
V 4543.5 899.8 17.62 +- 0.11
V 15962.5 899.8 18.89 +- 0.21
V 28443.5 899.8 19.95 is 3sigma upper limit
B 261.5 9.8 15.88 +- 0.13
B 430.5 9.8 16.36 +- 0.15
B 598.5 9.8 16.45 +- 0.16
B 767.0 8.4 16.91 +- 0.20
B 11133.5 899.8 19.12 +- 0.11
B 22648.5 899.8 20.13 +- 0.21
B 39108.5 897.3 20.70 +- 0.38
B 50681.5 899.8 20.74 +- 0.39
U 246.5 9.8 15.09 +- 0.19
U 416.5 9.7 15.69 +- 0.20
U 584.5 9.8 15.84 +- 0.21
U 753.5 9.7 16.00 +- 0.21
U 10226.5 899.8 18.58 +- 0.18
U 21749.0 900.0 19.13 +- 0.20
U 34939.5 507.6 19.88 +- 0.31
U 46660.0 814.1 19.89 +- 0.26
UVW1 487.0 68.6 17.70 +- 0.29 (co-added 10s exposures)
UVW1 6233.5 651.1 19.96 +- 0.41
UVW1 17730.0 806.0 20.18 is 3sigma upper limit
UVM2 473.0 68.5 18.86 is 3sigma upper limit (co-added)
UVM2 5450.5 899.8 20.48 is 3sigma upper limit
UVW2 487.5 58.8 19.30 is 3sigma upper limit (co-added)
UVW2 11969.5 753.2 20.62 is 3sigma upper limit
Magnitudes are based on preliminary zeropoints, measured in orbit, and
may require further refinement.