GCN Circular 22709
Subject
GRB 180510A: Swift/UVOT followup observations
Date
2018-05-12T07:21:32Z (6 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL), S. R. Oates (U.Warwick) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180510A 97
s after the BAT trigger (Gropp et al., GCN Circ. 22695).
A source is detected at the edge of the refined XRT position (D���Ai et
al. GCN Circ. 22707) but this is consistent with the position of a
USNO-B1.0 source (at 276.332, -31.908), and it is not clear if we see
any fading. Preliminary detections and 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 97 247 147 20.0 �� 0.3
white 28989 29010 21 >19.2
v 22961 23272 301 >19.4
b 28076 28983 885 20.2 �� 0.2
u 310 322 12 >17.6
uvw1 15854 16753 886 >20.6
uvw2 22055 22955 886 >20.5
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.26 in the direction of the
burst (Schlegel et al. 1998).