LIGO/Virgo (S200213t/IceCube neutrino candidate: No counterpart candidates in the Swift-XRT Observations
Abstract
The Neil Gehrels Swift Observatory observed the field of the IceCube track-like muon neutrino candidate (RA, Dec = 45.21d, 31.74d; GCN #27043) consistent with the sky localization of gravitational-wave candidate S200213t (GCN #27042) covering ~0.5 sq degrees in 7 tiles to cover the most probable regions of the joint GW and neutrino localization (90%-containment radius: 0.4d). The observations started at 09:54 UT on February 13th and ended at 10:26 UT on February 13th, 2020, and the typical sensitivity was 2e-13 erg cm^-2 s^-1 (0.3-10 keV). In total we found 3 "good" X-ray sources, all of which were classified as "rank 3", i.e. uncatalogued in X-rays, but with fluxes below historical upper limits. 2 further rank 3 sources were found with detection flag of "poor", indicating that they are likely spurious. Details of the good sources are: | Source ID | RA | Dec | Err90 | Flux* | | S200213t_X2 | 03h 01m 23.65s | +31d 42' 02.3" | 5.8" | 7.9e-13 | | S200213t_X4 | 02h 59m 58.48s | +31d 28' 17.1" | 7.1" | 2.2e-13 | | S200213t_X6 | 03h 00m 16.09s | +31d 58' 48.9" | 4.7" | 2.3e-13 | (* 0.3-10 keV, erg cm^-2 s^-1, assuming a power-law spectrum with photon index of 1.7 and NH=3e20cm^-2). Full details of all sources are available at: https://www.swift.ac.uk/LVC/S200213t/
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2020
- Bibcode:
- 2020GCN.27121....1C