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T: Fachverband Teilchenphysik
T 14: Gammaastronomie 1
T 14.8: Talk
Monday, March 27, 2017, 18:35–18:50, H 2
FACT - Time-Resolved Spectral Energy Distributions from Blazar Flares — •Daniela Dorner1 and Thomas Bretz2 for the FACT-Collaboration and the MWL-group collaboration — 1Universität Würzburg, Germany — 2RWTH Aachen, Germany
The First G-APD Cherenkov Telescope (FACT) is monitoring blazars at TeV energies. Based on the results of a fast quick look analysis, alerts are sent to the astronomy community with low latency. This allows to set up target-of-opportunity programs, as it has been done with the X-ray satellites Swift, INTEGRAL and XMM-Newton.
While FACT provides the monitoring at TeV energies on a nightly basis, Swift monitors weekly at X-rays to check for time-lags or correlations. In case FACT measures a flux above 70 events/hour, more sensitive observations with INTEGRAL or XMM-Newton are triggered to study the evolution of the spectrum during and after the flare.
Based on this program, time-resolved spectral energy distributions are compiled and used to discern radiation mechanisms such as synchrotron-self-Compton emission (X-ray flux and gamma-ray flux strictly correlated) from photo-hadronic cascade emission, allowing more complex variability patterns.
Here, we present preliminary results of simultaneous and time-resolved broadband observations of Mrk 421 during a moderate-high flux state in December 2015, which were triggered by FACT and include simultaneous observations with the X-ray telescopes Swift and INTEGRAL.