GCN Circular 22881
Subject
GRB 180630A: Swift/UVOT Detection
Date
2018-07-02T01:46:46Z (6 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 180630A: Swift/UVOT Detection
S. J. LaPorte (PSU) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180630A
88 s after the BAT trigger (D'Avanzo et al., GCN Circ. 22872).
A fading source consistent with the XRT position
(Beardmore et al. GCN Circ. 22873)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 03:15:55.74 = 48.98224 (deg.)
Dec (J2000) = -87:28:42.3 = -87.47842 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric
system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 88 237 148 17.49 +/- 0.04
white 6384 6584 196 19.50 +/- 0.11
v 629 1597 117 18.56 +/- 0.20
b 555 748 39 18.76 +/- 0.19
u 300 549 246 17.76 +/- 0.06
w1 678 7392 510 19.42 +/- 0.17
m2 654 7187 452 20.16 +/- 0.33
w2 605 6777 255 >19.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).