[vsnet-grb-info 9412] GRB 100625A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sun Jun 27 02:38:51 JST 2010
TITLE: GCN CIRCULAR
NUMBER: 10892
SUBJECT: GRB 100625A: Swift/UVOT Upper Limits
DATE: 10/06/26 17:38:46 GMT
FROM: Wayne Landsman at GSFC/SSAI <wayne.b.landsman at nasa.gov>
W. Landsman (NASA/GSFC/Adnet) and S. Holland ((CRESST/USRA/GSFC) report
on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100625A
56s after the BAT trigger (Holland et al., GCN Circ. 10884). No optical
afterglow consistent with the enhanced XRT position (Page et al., GCN
Circ. 10888) or the Gemini-South candidate afterglow position (Levan et
al. GCN Circ. 10887) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)
and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
-----------------------------------------------
white 87 206 147 >21.2 (FC)
u 269 519 246 >20.2 (FC)
white 87 11552 785 >22.6
v 598 5951 412 >20.3
b 524 10640 1117 >21.9
u 269 6522 614 >20.5
w1 4725 6362 393 >20.6
m2 4520 6157 393 >20.5
w2 4111 12302 1125 >21.5
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.012 in the direction of the burst
(Schlegel et al. 1998).
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