Simultaneous multi-wavelength flare observations of EV Lacertae

We acquired data of nearby dM3.5e star EV Lac using 5 different observatories: NASA's TESS mission, NASA's Neil Gehrels Swift Observatory ($Swift$), NASA's Neutron Interior Composition Explorer (NICER) and two ground based telescopes (University of Hawaii 2.2-m (UH88) and Las Cumbres Observatory Global Telescope (LCOGT) Network), to span a comprehensive, simultaneous wavelength coverage of flaring events. We identified 56 flares in the TESS light curve, 9 flares in the $Swift$ $UVM2$ light curve, 14 flares in the NICER X-ray light curve, and 1 flare in the LCOGT light curve. However, we did not identify flares in the $Swift$ XRT light curve or UH88 spectrum. We compare flare frequency distribution (FFD) of flares observed by TESS, NICER and $Swift$/UVOT. We find that the FFDs of TESS and NICER flares have comparable slopes, ${\beta }_T$ = -0.67$\pm$0.09 and ${\beta }_N$ = -0.64$\pm$0.19, and that the FFD of UVOT flares has a shallower slope (${\beta }_U$ = -0.38$\pm$0.13).