Speaker: Shubham Bhardwaj (D2, SOKENDAI\/NAOJ)<\/p>\n\n\n\n
Abstract:
Gamma-ray bursts (GRBs) are intense pulses of high-energy emission associated with massive stars\u2019 death or compact objects\u2019 coalescence. Their multi-wavelength observations help verify the reliability of the standard fireball model.\u00a0 We analyze 14 GRBs observed contemporaneously in gamma-rays by the Fermi Large Area Telescope (LAT), in X-rays by the Swift Telescope, and in the optical bands by Swift and many ground-based telescopes. We study the correlation between the spectral and temporal indices using closure relations according to the synchrotron forward-shock model in the stratified medium (n \u221dr^{-k}) with k ranging from 0 to 2.5. We find that the model without energy injection is preferred over the one with energy injection in all the investigated wavelengths.<\/p>\n","protected":false},"excerpt":{"rendered":"