GCN Circular 14660
Subject
GRB 130515A: Swift/UVOT Upper Limits
Date
2013-05-15T14:16:02Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL), M. De Pasquale (MSSL-UCL) and D. Malesani (DARK/NBI)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130515A
79 s after the BAT trigger (Malesani et al., GCN Circ. 14650).
In the intial UVOT exposures, we do not detect an optical afterglow consistent
with the refined XRT position (Beardmore et al. GCN Circ. 14654). We also do not
detect an optical source consistent with the positions of s1 and s2 reported by the VLT
(Xu et al. GCN Circ. 14653) and Gemini (Cenko et al., GCN Circ. 14656),
nor at the positions of the sources reported by GROND (Schmidl et al., GCN Circ. 14655).
However, we do marginally detect VLT s3 (Xu et al. GCN Circ. 14653) in white
at a magnitude of 21.59 +/- 0.39, which is also observed in the DSS.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures at the refined
XRT position are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 79 229 147 >21.2
u_FC 291 541 246 >20.2
white 79 6414 580 >21.7
v 620 5388 236 >19.8
b 546 6209 432 >21.0
u 291 6003 659 >20.7
w1 669 5798 413 >20.7
m2 645 5592 236 >20.0
w2 596 6603 415 >20.7
The magnitudes in the table are not corrected for the
Galactic extinction due to the reddening of E(B-V) = 0.07
in the direction of the burst (Schlegel et al. 1998).