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GCN Circular 28724

Subject
Swift-XRT observations of IceCube 201021A
Date
2020-10-21T17:02:45Z (3 years ago)
From
Timothee Gregoire at Penn State <tmg5746@psu.edu>
H. A. Ayala Solares (PSU), D.F. Cowen (PSU), J. DeLaunay (PSU),
D. B. Fox (PSU), A. Keivani (Columbia U.), J.P. Osborne (U. Leicester),
F. Krauss (PSU), T. Gregoire (PSU), P.A. Evans (U. Leicester) and
J.A. Kennea (PSU) report:

Swift observed the field of IceCube 201021A (GCN Circ. 28715) between 08:56:50
2020 October 21 and 12:05:31 on 2020 October 21, collecting a total of 3.4 ks of
cleaned photon counting (PC) mode data. The observations used a 4-point tiling
pattern with a radius of ~0.3 degrees.

We found 4 X-ray sources, as detailed below. All of these are either known X-ray
sources, consistent with catalogued fluxes, or are unknown but with count rate
consistent with the previous non-detections. We therefore do not claim any of
them as the likely counterpart to IceCube 201021A.

The 3-sigma upper limit in the field was in the range 5-8 x 10^-3 ct/sec.

The detected sources were:

Source no:   1
RA (J2000):  260.80883 [degrees] = 17h 23m 14.12s
Dec (J2000): +14.3492 [degrees] = +14d 20' 57.2"
Error:       +4.5 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 1.2 (+0.7, -0.5) x 10-2 ct s-1
Flux (0.3-10 keV):       5.3 (+3.2, -2.3) x 10-13 erg cm-2 s-1
Notes: This source is consistent with 1RXS J172314.4+142103


Source no:   2
RA (J2000):  261.04703 [degrees] = 17h 24m 11.29s
Dec (J2000): +14.7320 [degrees] = +14d 43' 55.3"
Error:       +5.2 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 7 (+4, -3) x 10-3 ct s-1
Flux (0.3-10 keV):       3.1 (+1.9, -1.3) x 10-13 erg cm-2 s-1


Source no:   3
RA (J2000):  260.59538 [degrees] = 17h 22m 22.89s
Dec (J2000): +14.7598 [degrees] = +14d 45' 35.3"
Error:       +6.3 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 7.2 (+2.9, -2.3) x 10-3 ct s-1
Flux (0.3-10 keV):       3.10 (+1.27, -1.00) x 10-13 erg cm-2 s-1


Source no:   4
RA (J2000):  260.84848 [degrees] = 17h 23m 23.63s
Dec (J2000): +14.7720 [degrees] = +14d 46' 19.3"
Error:       +5.0 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 7.4 (+3.6, -2.7) x 10-3 ct s-1
Flux (0.3-10 keV):       3.2 (+1.5, -1.2) x 10-13 erg cm-2 s-1
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