Anti-correlation between Flux and Photon Index of Hard X-ray Emission from The Crab

Koothodil Abhijith Augustine, Hsiang-Kuang Chang

Using \textit{Swift} Burst Alert Telescope (BAT) event-mode data during Gamma Ray Burst (GRB) occurrences, we conducted spectral analysis for the Crab system. From 38 good observat…