GCN Circular 20268
Subject
GRB 161214B: Swift/UVOT Afterglow Confirmation
Date
2016-12-15T14:57:31Z (7 years ago)
From
Frank Marshall at GSFC <femarsha@khamseen.gsfc.nasa.gov>
F. E. Marshall (NASA/GSFC) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:
Continuing Swift/UVOT observations of the field of GRB 161214B
(D'Avanzo et al., GCN Circ. 20257) show that the single source
consistent with the XRT position (Goad et al. GCN Circ. 20264)
reported by Marshall and D'Avanzo (GCN Circ. 20261) brightened
to 17.89 mag in white and then subsequently dimmed by more than
1 magnitude. This confirms the detection of the afterglow
reported by Kugel (GCN Circ. 20262), Klotz et al. (GCN Circ. 20263),
and Watson et al. (GCN Circ. 20266) following the suggestion
by Malesani et al. (GCN Circ. 20260). Detection of the afterglow
in the w2 filter indicates that the redshift is < 1.5.
Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures
are given in the following table. The magnitudes include contributions
from both the afterglow and the catalogued star SDSS J001524.26+072108.5.
Filter T_start(s) T_stop(s) Exp(s) Mag
white 84 234 147 19.3 +/- 0.1
white 748 768 18 17.9 +/- 0.1
white 27988 28895 841 19.5 +/- 0.1
u 296 546 246 18.4 +/- 0.1
u 17963 18176 208 19.1 +/- 0.2
w2 5119 5319 197 18.8 +/- 0.2
w2 28903 29657 742 20.4 +/- 0.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).