[vsnet-grb-info 26415] Swift-XRT observations of IceCube 200926A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28515
SUBJECT: Swift-XRT observations of IceCube 200926A
DATE:    20/09/27 21:27:42 GMT
FROM:    Timothee Gregoire at Penn State  <tmg5746 at psu.edu>

T. Gregoire (PSU), P.A. Evans (U. Leicester), J.A. Kennea (PSU),
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) report:

Swift observed the field of IceCube 200926A (GCN Circ. 28504) between 11:44:33
2020 September 26 and 13:45:03 on 2020 September 26, collecting a total of 3.8 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 5 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 200926A
A futher 4 sources were detected, but their detection flag of 4 indicates that
they were likely spurious.

The 3-sigma upper limit in the field was in the range 6-8 x 10^-3 ct/sec.

The detected sources were:

Source no:   1
RA (J2000):  96.44016 [degrees] = 06h 25m 45.64s
Dec (J2000): -4.3672 [degrees] = -04d 22' 02.0"
Error:       +5.5 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 0.0104 (+0.0036, -0.0029) ct s-1
Flux (0.3-10 keV):       4.5 (+1.5, -1.3) x 10-13 erg cm-2 s-1
Note: This is 3.0" from the SIMBAD object 2MASX J06254558-0422053


Source no:   2
RA (J2000):  96.44428 [degrees] = 06h 25m 46.63s
Dec (J2000): -4.28706 [degrees] = -04d 17' 13.4"
Error:       +6.1 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 6.2 (+2.8, -2.2) x 10^-3 ct s-1
Flux (0.3-10 keV):       2.68 (+1.19, -0.93) x 10^-13 erg cm-2 s-1


Source no:   3
RA (J2000):  96.71505 [degrees] = 06h 26m 51.61s
Dec (J2000): -4.3578 [degrees] = -04d 21' 27.9"
Error:       +4.7 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 0.0114 (+0.0036, -0.0030) ct s-1
Flux (0.3-10 keV):       4.9 (+1.5, -1.3) x 10-13 erg cm-2 s-1
Note: This is 3.3" from the SIMBAD object Cl* NGC 2232    CPK   18627


Source no:   7
RA (J2000):  96.28302 [degrees] = 06h 25m 07.93s
Dec (J2000): -4.15135 [degrees] = -04d 09' 04.9"
Error:       +8.0 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 9 (+5, -4) x 10-3 ct s-1
Flux (0.3-10 keV):       3.8 (+2.1, -1.5) x 10-13 erg cm-2 s-1


Source no:   8
RA (J2000):  96.45055 [degrees] = 06h 25m 48.13s
Dec (J2000): -4.51977 [degrees] = -04d 31' 11.2"
Error:       +3.0 [arcsec, 90% conf. radius]
Count rate (0.3-10 keV): 0.049 (±0.011) ct s-1
Flux (0.3-10 keV):       2.1 (±0.5) ×10-12 erg cm-2 s-1
Note: This is 0.4" from the SIMBAD object Gaia DR2 3104506437197663232