GCN Circular 23400
Subject
GRB 181030A: Swift/UVOT Detection
Event
Date
2018-10-31T13:40:13Z (8 years ago)
From
Sam Emery at MSSL-UCL <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181030A
152 s after the BAT trigger (Sonbas et al., GCN Circ. 23389).
A fading source is detected in the initial UVOT exposures at a position
consistent with the XRT position (Beardmore et al., GCN Circ. 23391) and
also with SAO RAS (Moskvitin et al., GCN Circ. 23390) and MASTER Net
(Lipunov et al., GCN Circ. 23392).
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 152 270 116 19.34 +/- 0.30
white 3978 5614 393 >20.7
v 4389 6009 378 >18.9
b 3774 17487 635 >20.1
u 3569 17236 1278 >20.3
uvw1 4799 11747 852 >20.2
uvm2 4594 22498 1201 >20.7
uvw2 4184 5819 393 >20.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).