GCN Circular 11176
Subject
Swift/UVOT Observations of GRB100901A
Date
2010-09-02T13:40:17Z (14 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. A. Pritchard (PSU) and Immler (CRESST/GSFC/UMD)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100901A
147 s after the BAT trigger (Immler et al., GCN Circ. 11159).
We detect an object not present in the DSS in all filters within 0.1
arcsec of the Enhanced Swift-XRT position (Osborne et al., GCN Circ. 11169)
Preliminary magnitudes and 3-sigma upper limits using the UVOT
photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white (FC) 147 297 147 19.55 � 0.19
u (FC) 305 555 246 17.52 � 0.10
white 585 605 20 18.58 � 0.32
white 4849 5051 198 18.66 � 0.07
b 561 581 19 17.85 � 0.30
b 4644 4844 197 18.69 � 0.11
u 305 555 246 17.52 � 0.10
u 4439 4639 197 18.08 � 0.10
v 129 139 10 >17.21
v 3824 4024 197 18.50 � 0.21
w1 4234 4434 197 18.53 � 0.16
m2 4029 4229 197 19.22 � 0.32
w2 611 626 15 >17.6
w2 5055 5255 197 >20.04
w2 9620 10520 885 20.73 � 0.32
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).