| Title | A detailed spectral study of GRB 041219A and its host galaxy |
| Authors | Götz, D.; Covino, S.; Hascoët, R.; Fernandez-Soto, A.; Daigne, F.; Mochkovitch, R.; Esposito, P. |
| Bibcode | 2011MNRAS.413.2173G Search ADS ↗ |
| Abstract | GRB 041219A is one of the longest and brightest gamma-ray bursts (GRBs) ever observed. It was discovered by the INTEGRAL satellite, and thanks to a precursor happening about 300 s before the bulk of the burst, ground-based telescopes were able to catch the rarely observed prompt emission in the optical and in the near-infrared bands. Here we present the detailed analysis of its prompt gamma-ray emission, as observed with IBIS onboard INTEGRAL, and of the available X-ray afterglow data collected by X-Ray Telescope onboard Swift. We then present the late-time multiband near-infrared imaging data, collected at the Telescopio Nazionale Galileo (TNG) and the Canada-France-Hawaii Telescope (CFHT), that allowed us to identify the host galaxy of the GRB as an underluminous, irregular galaxy of ̃5 × 109 M☉ at best-fitting redshift of z= 0.31+0.54-0.26. We model the broad-band prompt optical to gamma-ray emission of GRB 041219A within the internal shock model. We were able to reproduce the spectra and light curve invoking the synchrotron emission of relativistic electrons accelerated by a series of propagating shock waves inside a relativistic outflow. On the other hand, it is less easy to simultaneously reproduce the temporal and spectral properties of the infrared data. |
| Objects | 2 Objects Search NED ↙ |
