Observations of the intense and ultra-long burst GRB 041219a with the Germanium spectrometer on INTEGRAL

• Published in: Astronomy and astrophysics (Berlin) 2006-08, Vol.455 (2), p.433-440
• Main Authors: McBreen, S., Hanlon, L., McGlynn, S., McBreen, B., Foley, S., Preece, R., von Kienlin, A., Williams, O. R.
• Format: Article
• Language: English
• ISSN: 0004-6361; 1432-0746
• DOI: 10.1051/0004-6361:20065203

Context. GRB 041219a is the brightest burst localised by INTEGRAL. The peak flux of 43 ph cm super(-2) s super(-1) ( gamma-ray afterglow. Results. The overall burst and sub-intervals are well fit by the Band model. The photon index below the break energy shows a marked change after the quiescent time interval. In addition the spectra are well described by a black body component with a power law. The burst was detected by BAT and ASM during the long quiescent interval in SPI indicating the central engine might not be dormant but that the emission occurs in different bands. No significant emission or absorption features were found and limits of 900 eV and 120 eV are set on the most significant features. No gamma-ray afterglow was detected from the end of the prompt phase to similar to 12 h post-burst. Broadband spectra of the prompt emission were generated in 7 time intervals using gamma-ray, X-ray, optical and near-infrared data and these were compared to the high-redshift burst GRB 050904. The optical and gamma-ray emission are correlated in GRB 041219a. We estimate isotropic radiated energy ( sigma uncertainty on log M_\mathrm{vir} angle for the whole lens sample is about 0.2. We compare our results to those obtained from the Red-Sequence Cluster Survey (RCS) and the Sloan Digital Sky Survey (SDSS). Taking differences in the actual modelling into account, we find very good agreement with these surveys.