X-ray Flate in TeV-detected BL Lacertae Source 1ES 0727+502
ATel #7342; Bidzina Kapanadze (Ilia State University, Tbilisi, Georgia)
on 3 Apr 2015; 17:04 UT
Credential Certification: Bidzina Kapanadze (bidzina_kapanadze@iliauni.edu.ge)
The TeV-detected HBL object 1ES 1727+502 (1Zw 187, z=0.055) has been targeted six times by the Swift satellite between 2015 March 25 and April 3 in the framework of the ToO observations requested by us and Fallah Ramazani (medium and low urgencies, respectively). The pointing-averaged 0.3-10 keV count rate initially increased by 35% till 1.60+/-0.06 ctS/s (March 28), and then a small drop by 0.13 cts/s was observed on March 29. Afterwards, the source shows a consequent brightening and its 0.3-10 keV count rate has reached the value of 2.33+/-0.06 cts/s (April 3) that corresponds to the highest historical X-ray brightness state observed since the start of Swift observations of this AGN (2010 April 2). Among these six observations, the spectra extracted from Obsid 00040635008, 00040635009 and 00040635013 fit well with a single powerlaw (The 0.3-10 keV photon index \Gamma=1.90-2.24) while those from the pointings Obsid 00040635010, 00040635011 and 00040635012 fit better with the logparabola model with the photon index at 1 keV \alpha=1.86-2.01, the curvature parameter b=0.34-0.55, the position of synchrotron SED Ep=0.97-1.37 keV. These six spectra showed the ranges of unabsorbed 2-10 keV and 0.3-10 keV fluxes of (1.51-3.17)\times 10{-11} erg/cm^2/s and (3.99-6.71)\times 10{-11} erg/cm^2/s, respectively. 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 1727+502 are strongly encouraged to study instable processes and emission mechanisms in this source.
