FERMI and swift gamma-ray burst afterglow population studies

J. L. Racusin, S. R. Oates, P. Schady, D. N. Burrows, M. De Pasquale, D. Donato, N. Gehrels, S. Koch, J. McEnery, T. Piran, P. Roming, T. Sakamoto, C. Swenson, E. Troja, V. Vasileiou, F. Virgili, D. Wanderman, B. Zhang

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Abstract

The new and extreme population of gamma-ray bursts (GRBs) detected by the Fermi Large Area Telescope (LAT) shows several new features in high-energy gamma rays that are providing interesting and unexpected clues into GRB prompt and afterglow emission mechanisms. Over the last sixyears, it has been Swift that has provided the robust data set of UV/optical and X-ray afterglow observations that opened many windows into components of GRB emission structure. The relationship between the LAT-detected GRBs and the well-studied, fainter, and less energetic GRBs detected by the Swift Burst Alert Telescope is only beginning to be explored by multi-wavelength studies. We explore the large sample of GRBs detected by BAT only, BAT and the Fermi Gamma-ray Burst Monitor (GBM), and GBM and LAT, focusing on these samples separately in order to search for statistically significant differences between the populations, using only those GRBs with measured redshifts in order to physically characterize these objects. We disentangle which differences are instrumental selection effects versus intrinsic properties in order to better understand the nature of the special characteristics of the LAT bursts.

Original languageEnglish (US)
Article number138
JournalAstrophysical Journal
Volume738
Issue number2
DOIs
StatePublished - Sep 10 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Racusin, J. L., Oates, S. R., Schady, P., Burrows, D. N., De Pasquale, M., Donato, D., Gehrels, N., Koch, S., McEnery, J., Piran, T., Roming, P., Sakamoto, T., Swenson, C., Troja, E., Vasileiou, V., Virgili, F., Wanderman, D., & Zhang, B. (2011). FERMI and swift gamma-ray burst afterglow population studies. Astrophysical Journal, 738(2), [138]. https://doi.org/10.1088/0004-637X/738/2/138