X-ray Flaring State in the HBL Source 1ES 1959+650
ATel #8014; Bidzina Kapanadze (E. Kharadze Abastumani Astrophysical Observatory at Ilia State University)
on 8 Sep 2015; 09:04 UT
Credential Certification: Bidzina Kapanadze (bidzina_kapanadze@iliauni.edu.ge)
Subjects: X-ray, AGN, Blazar
Referred to by ATel #: 8193, 9148, 9949, 10430, 10514, 10743, 11059, 11538, 15433, 16087, 16162
The nearby (z=0.048) TeV-detected HBL object 1ES 1959+650 has been observed three times with X-ray Telecope onboard Swift satellite (Swift-XRT) since 2015 August 25 on the basis of our ToO request of medium urgency (see https://www.swift.psu.edu/secure/toop/summary.php). During this period, the source shows a permanent increase in the 0.3-10 keV count rate from 8.00+/-0.11 cts/s to 11.50+/-0.12 cts/s, derived from the today's pointing. The fluxes, equal or higher than the latter value, were observed with Swift-XRT only three times in the past, and the current flux level is only by 19.5% lower compared to the highest historical one, recorded on 2006 May 24. In the framework of one-zone SSC models, an increased activity is also expected in the UV-radio and gamma-ray parts of the spectrum, and intensive multiwavelength observations of 1ES 1959+650 are strongly encouraged to study instable processes and emission mechanisms in this source.