GCN Circular 17217
Subject
GRB 141215A: further Swift-XRT observations and afterglow detection
Date
2014-12-22T16:56:41Z (10 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
V. D'Elia (ASDC), L. Izzo (URoma/ICRA) & M. M. Chester (PSU) report on
behalf of the Swift team
Swift-XRT observed again the field of the IPN GRB 141215A (Hurley et
��al. GCN 17186). The observation started on 2014-12-21 at 01:22UT,
i.e., ~5.5 days after the burst detection. Source #1 (that with a
2MASS counterpart) and source #3 (which has a DSS counterpart)
reported by D'Elia & Izzo (GCN 17190) are still detected with a count
rate comparable to that of the first exposure and are thus not related
with the GRB. On the other hand, source #2 faded considerably with
respect to the first observation. Its decay index is alpha~1, which is
consistent with a typical afterglow behavior. We thus conclude that
source #2 is the X-ray counterpart of GRB 141215A.
Swift/UVOT observed the initial two tiled fields for GRB 141215A
beginning ~100 ks after the IPN trigger. No optical counterpart was
detected for Swift/XRT Source #2 (D'Elia et al. GCN Circ. 17190).
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are:
Source #2:
Filter T_start(s) T_stop(s) Exp(s) UL
white 118715 125192 1026 > 21.35
v 119529 120370 824 > 19.39
u 117902 124472 1580 > 20.85
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.176 in the direction of
the burst (Schlegel et al. 1998).
Details on the XRT analysis can be found at:
http://www.swift.ac.uk/xrt_products/TILED_GRB00035/
This is an official product of the Swift team.