GCN Circular 18384
Subject
GRB 151001B: Swift/UVOT Upper Limits
Date
2015-10-02T18:50:46Z (9 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151001B
148 s after the BAT trigger (Krimm et al., GCN Circ. 18374).
No optical afterglow consistent with the XRT position (Evans et al. GCN
Circ. 18377) is detected in the initial UVOT exposures.
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 are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 148 298 147 >20.6
white 148 6765 805 >21.8
u_FC 307 557 246 >19.9
v 636 7175 529 >20.2
b 563 6561 333 >20.9
u 307 11107 685 >20.7
w1 686 7585 510 >20.2
m2 661 7380 529 >20.2
w2 613 6970 529 >20.6
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 1.71 in the direction of the
burst (Schlegel et al. 1998).