GCN Circular 19656
Subject
GRB 160703A: Swift/UVOT Detection
Event
Date
2016-07-05T18:44:25Z (9 years ago)
From
Lea Hagen at PSU <lea.zernow.hagen@gmail.com>
L. M. Z. Hagen (PSU) and S. B. Cenko (GSFC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160703A
75 s after the BAT trigger (Cenko et al., GCN Circ. 19645). We detect a
fading source consistent with the XRT position (D'Elia et al. GCN Circ.
19655) and optical detections (Tachibana et al., GCN Circ. 19652; Kuroda
et al., GCN Circ. 19653).
Preliminary detections 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 75 225 147 14.09+-0.02
white 567 1014 186 16.64+-0.03
white 4890 5090 196 18.33+-0.05
v 617 1064 58 16.51+-0.10
v 5300 5500 196 18.34+-0.17
b 543 735 38 16.38+-0.06
b 4685 4885 196 18.76+-0.11
u 288 537 245 15.05+-0.03
u 691 710 19 15.88+-0.09
u 4480 4680 196 17.79+-0.08
uvw1 666 1113 58 16.80+-0.12
uvm2 642 1089 58 17.75+-0.25
uvm2 5505 5695 187 19.07+-0.29
uvw2 593 1040 58 18.38+-0.27
uvw2 5096 5295 196 19.45+-0.30
The detection in all UVOT filters is consistent with a redshift of
z < ~1.5.
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).