Swift observation of a flaring very extreme blazar in the error region of the high-energy neutrino Ice-Cube 200107A
ATel #13394; P. Giommi, T. Glauch, E. Resconi (TUM-IAS)
on 9 Jan 2020; 18:25 UT
Credential Certification: Paolo Giommi (paolo.giommi@asi.it)
Subjects: X-ray, Neutrinos, Blazar
The high energy peaked object 3HSPJ095507.1+355100 = 5BZB J0955+3551 is a bright and extreme blazar that is located well within the uncertainty region of the neutrino candidate event IceCube-200107A (GCN 26655). A short Swift ToO of this source, carried out on Jan-8-2020, found the blazar to be at its brightest flux ever recorded and with a synchrotron peak energy that is much larger than observed in the past. From a preliminary analysis of the Swift data, performed using the ASI-SSDC and the OpenUniverse (openuniverse.asi.it) online tools we see that the peak energy is located at energies larger than the Swift XRT bandpass (0.3-10 keV) with a rough estimate of E_peak >~ 1E18.5, a value reached only by a handful of known objects in the sky.
