GCN Circular 10688
Subject
GRB 100424A: Swift/UVOT Upper Limits
Date
2010-04-25T14:39:39Z (14 years ago)
From
Peter Curran at MSSL <pac@mssl.ucl.ac.uk>
P.A. Curran (MSSL-UCL) and E. Hoversten (PSU) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 100424A
128 s after the BAT trigger (Hoversten et al., GCN Circ. 10667). No
optical afterglow consistent with the refined XRT position (Evans et
al., GCN Circ. 10669) or the proposed NIR counterpart (Cenko et al. (GCN
Circ. 10682) 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 initial finding charts (FC)
and exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
----------------------------------------------
white 128 278 147 >20.8 (FC)
u 288 537 246 >20.0 (FC)
white 128 2046 444 >21.2
v 618 1930 156 >19.2
b 543 2028 156 >20.1
u 288 2003 382 >20.1
w1 668 1979 156 >19.7
m2 642 1955 97 >19.1
w2 594 5584 193 >20.0
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).