GCN Circular 11115
Subject
GRB 100816A: Swift UVOT Observations
Event
Date
2010-08-16T21:34:49Z (15 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 100816A 91s
after the BAT trigger (Oates et al., GCN Circ. 11102). We detect the
optical afterglow significantly in the white and u filters and
marginally in the v, b and uvw1 filters. The best UVOT position was
reported
in Oates et al. (GCN Circ. 11102), and is consistent with the
XRT enhanced position (Evans et al., GCN Circ 11110) and with the
optical
afterglow position reported by TNG (Antonelli et al., GCN Circ 11104).
Preliminary magnitudes and the 3 sigma upper limits are reported below
for
individual white and u images and summed images for the v, b, uvw1,
uvm2 and uvw2 filters.
Filter T_start(s) T_stop(s) Exposure Mag/3SigUL
###########################################################
white (FC) 91 241 147 17.01 +/- 0.05
white 586 606 19 18.90 +/- 0.19
v 3991 5626 393 21.56 +/- 0.94
b 4811 6393 341 21.07 +/- 0.35
u (FC) 305 555 246 18.02 +/- 0.08
u 4606 4806 197 20.39 +/- 0.35
uvw1 4401 6036 393 20.98 +/- 0.44
uvm2 4196 34516 1279 > 21.42
uvw2 3787 28671 2475 > 22.19
###########################################################
The above magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E_{B-V} = 0.09 mag (Schlegel et al.,
1998, ApJS, 500, 525). The photometry is on the UVOT photometric system
described in Poole et al. (2008, MNRAS, 383,627).