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A search for spectral hysteresis and energy-dependent time lags from x-ray and tev gamma-ray observations of mrk 421
(American Astronomical Society, 2016-12-22)
Blazars are variable emitters across all wavelengths over a wide range of timescales, from months down to minutes. It is therefore essential to observe blazars simultaneously at different wavelengths, especially in the ...
Discovery of very-high-energy emission from rgb j2243+203 and derivation of its redshift upper limit
(American Astronomical Society, 2017-11-10)
Very-high-energy (VHE; > 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 2014 December 21 and 24. The VERITAS energy ...
Discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas
(IOP Publishing, 2010-01-14)
We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level ...
The 2009 multiwavelength campaign on mrk 421: variability and correlation studies
(EDP Sciences, 2015-04-01)
Aims. We perform an extensive characterization of the broadband emission of Mrk 421, as well as its temporal evolution, during the non-flaring (low) state. The high brightness and nearby location (z = 0.031) of Mrk 421 ...
Veritas observations of the bl lac object pg 1553+113
(IOP Publishing, 2015-01-09)
We present results from VERITAS observations of the BL Lac object PG 1553+113 spanning the years 2010, 2011, and 2012. The time-averaged spectrum, measured between 160 and 560 GeV, is well described by a power law with a ...
Multiwavelength observations of the agn 1es 0414+009 with veritas,fermi-lat,swift-xrt, and mdm
(IOP Publishing, 2012-08-02)
We present observations of the BL Lac object 1ES 0414+009 in the >200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between 2008 January and 2011 February, ...