17-Month Crab/Mrk 421/Mrk 501 Lightcurves

This data set contains daily light curves for the Crab Nebula and the BL Lac objects Markarian (Mrk) 421 and Mrk 501 from HAWC observations between 2014 November 26 and 2016 April 20.

A detailed discussion of these light curves, their production, and of multiwavelength counterparts is provided in Abeysekara et al., The Astrophysical Journal, Volume 841, Issue 2, article id. 100 (2017) Please cite this reference in in any work that makes use of or includes all or part of these light curve data.

The ASCII format contains one line for each sidereal day, capturing the HAWC observation of TeV gamma rays for one transit of the respective object. Average transit observations last 6 hours, corresponding to zenith angles not larger than ~45 degrees. Due to occasional detector down time, some transits have a lower coverage, indicated as fractions in a column of the ASCII files. Only transits with a minimum coverage of 0.5 are included. Flux values and uncertainties (one standard deviation) are given both in photons/(cm^2 s) and in Crab Units (CU), compared to the average HAWC-measured Crab flux indicated in the header. For the Crab, Mrk 421 and Mrk 501, individual flux integration thresholds of 1 TeV, 2 TeV, and 3 TeV, respectively, were used (see header), in order to minimize systematic uncertainties. The last column of the files also provides a test statistic value for the significance of the transit measurement compared to the null hypothesis. A library of python scripts to visualize and analyze these light curves can be found at: https://github.com/rjlauer/lctools

Download the dataset here.