GRB 170117A
GCN Circular 20481
Subject
GRB 170117A: Swift ToO observations
Date
2017-01-18T02:56:18Z (8 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT GRB 170117A.
Automated analysis of the XRT data will be presented online at
http://www.swift.ac.uk/ToO_GRBs/00020728
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the Swift/BAT event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 20482
Subject
GRB 170117A: Swift-XRT observations
Date
2017-01-18T21:43:57Z (8 years ago)
From
Andrea Melandri at INAF-OAB <andrea.melandri@brera.inaf.it>
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), B.
Mingo (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC),
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB) and P.A. Evans (U.
Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the
Swift/BAT-detected burst GRB 170117A, collecting 2.9 ks of Photon
Counting (PC) mode data between T0+86.3 ks and T0+116.0 ks.
No X-ray sources have been detected consistent with being within 296
arcsec of the Swift/BAT position. The 3-sigma upper limit in the field
ranges from ~0.003 to ~0.004 ct s^-1, corresponding to a 0.3-10 keV
observed flux of 1.3e-13 to 1.8e-13 erg cm^-2 s^-1 (assuming a typical
GRB spectrum).
An uncatalogued was detected, however this was too far from the GRB
position to be the afterglow.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
http://www.swift.ac.uk/ToO_GRBs/00020728.
This circular is an official product of the Swift-XRT team.
GCN Circular 20484
Subject
GRB 170117A: Swift/UVOT Upper Limits
Date
2017-01-19T12:38:02Z (8 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170117A
86251 s after the BAT trigger (Palmer, GCN Circ. 20480).
No optical afterglow consistent with the BAT position given in that
circular is detected in the initial UVOT exposures.
The preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial summed
exposures is:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 86251 116034 2654 >22.0
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.35 in the direction of the
burst (Schlegel et al. 1998).