Mrk 421 is still active through X-rays
ATel #4864; Bidzina Kapanadze (Ilia State Iniversity)
on 6 Mar 2013; 17:37 UT
Credential Certification: Bidzina Kapanadze (bidzina_kapanadze@iliauni.edu.ge)
Referred to by ATel #: 4918
In ATel #4792 (B. Kapanadze, âHigh X-Ray State in HBL Source Mrk 421â), we reported about the flaring activity in the high-energy peaked BL Lacertae source Mrk 421 (z=0.031) detected via the observations performed between January 25 and February 6, 2013, by the X-ray Telescope (XRT) onboard the Swift satellite. The data, allocated at the webpage http://www.swift.psu.edu/monitoring/ , show that the source was relatively quiet afterwards with the 0.3-10 keV flux of 16.83+\-0.13 cts/s during the March 1 Swift/XRT pointing. However, the subsequent observation performed on March 4 with this instrument revealed the X-ray flux more than twice higher through the aforementioned band: 35.48+\-0.25 cts/s. The flux was about with ~15% lower next day (30.52+\-0.10 cts/s) and it showed a fast variability above the 99.9% confidence level during 6.5 hr (chi-square is equal to 2.805 with 113 d.o.f.). We strongly encourage the intensive multiwavelength observations of Mrk 421 as with the ground-based telescopes as by means of the different space missions.
