Abstract:

The observations presented here are part of the multi-instrument campaign for Mrk 421 that has occurred yearly since 2009 (Abdo+ 2011ApJ...736..131A).

The instruments that participated in the 2013 campaign, as well as their performances and data analysis strategies, were reported in Balokovic+ (2016ApJ...819..156B), which is our first publication with the 2013 multi-instrument data set, and it focused on the low X-ray/very-high-energy (VHE; >0.1TeV) activity observed in 2013 January-March.

During the first observations in 2013 April, Mrk 421 showed high X-ray and VHE gamma-ray activity, which triggered daily few-hour-long multi-instrument observations that lasted from April 10 (MJD 56392) to April 19 (MJD 56401). Among other instruments, this data set contains an exceptionally deep temporal coverage at VHE gamma-rays above 0.2TeV, as the source was observed with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) during nine consecutive nights, and with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) during six nights.

A key characteristic of this data set is the extensive and simultaneous coverage in the X-ray bands provided by Swift and, especially, by the Nuclear Spectroscopic Telescope Array (NuSTAR). See Section 2 for further details.

(23 data files).

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