High Energetic Gamma Ray Bursts and Their Spectral Properties Within the Fireshell Model

The analysis of various Gamma Ray Bursts (GRBs) characterized by an isotropic energy Eiso ≲ 1053 ergs within the fireshell model has shown how that the observed N(E) spectrum of their prompt emission can be reproduced in a satisfactory way by assuming a thermal spectrum in the comoving frame of the fireshell. Nevertheless, from the study of higher energetic bursts (Eiso ≳ 1054ergs) such as, for example, GRB 080319B, some discrepancies between the numerical simulations and the observational data have been observed. We investigate a different spectrum of photons in the comoving frame of the fireshell in order to better reproduce the spectral properties of GRB prompt emission within the fireshell model. We introduce a phenomenologically modified comoving thermal spectrum: a spectrum characterized by a different asymptotic low energy slope with respect to the thermal one. We test this spectrum by comparing the numerical simulations with the observed prompt emission spectra of various GRBs; we present, as an exaple, the case of GRB 080319B.

[1]  N. Gehrels,et al.  Gamma-Ray Bursts , 2016, Stars and Stellar Processes.

[2]  D. Lazzati,et al.  NON-THERMAL EMISSION FROM THE PHOTOSPHERES OF GAMMA-RAY BURST OUTFLOWS. I. HIGH-FREQUENCY TAILS , 2010, 1005.4704.

[3]  Felix Ryde,et al.  QUASI-BLACKBODY COMPONENT AND RADIATIVE EFFICIENCY OF THE PROMPT EMISSION OF GAMMA-RAY BURSTS , 2008, 0811.4135.

[4]  The canonical Gamma-Ray Bursts and their ``precursors'' , 2008, 0901.1545.

[5]  M. Kramer.  BINARY PULSARS AND GENERAL RELATIVISTIC EFFECTS , 2008 .

[6]  R. Sunyaev,et al.  Short cosmic events: A subset of classical GRBs? , 2008 .

[7]  C. Bianco,et al.  Theoretical Interpretation of GRB060124:. Preliminary Results , 2008, 0804.3983.

[8]  Short and canonical GRBs , 2008, 0804.2803.

[9]  R. Ruffini,et al.  Thermalization of Electron‐Positron‐Photon Plasmas with an application to GRB , 2008 .

[10]  C. Bianco,et al.  GRB 060614: a progress report , 2008 .

[11]  C. Cherubini,et al.  On the “Dyadotorus” of the Kerr‐Newman Spacetime , 2008 .

[12]  C. Bianco,et al.  The “fireshell” model and the “canonical GRB” scenario , 2008 .

[13]  C. Bianco,et al.  GRB970228 and the class of GRBs with an initial spikelike emission: do they follow the Amati relation? , 2007, 0712.0550.

[14]  C. Bianco,et al.  Theoretical Interpretation of Luminosity and Spectral Properties of GRB 031203 , 2005, 0804.2821.

[15]  PAIR PLASMA AND GAMMA RAY BURSTS by Gregory Vereshchagin Submitted to the Graduate Faculty of the International Relativistic Astrophysics PhD Program in partial ful llment of the requirements for the degree of Doctor of Philosophy Rome , 2008 .

[16]  Gregory V. Vereshchagin,et al.  The Blackholic energy and the canonical Gamma-Ray Burst , 2007, 0706.2572.

[17]  C. Bianco,et al.  The role of GRB 031203 in clarifying the astrophysical GRB scenario , 2007, 0705.2456.

[18]  Melvyn B. Davies,et al.  Progenitors of Long Gamma‐Ray Bursts , 2007, 0704.1899.

[19]  C. Bianco,et al.  Theoretical interpretation of GRB011121 , 2007 .

[20]  E. Palazzi,et al.  Optical observations of GRB 060218/SN 2006aj and its host galaxy , 2006, astro-ph/0610417.

[21]  E. Ramirez-Ruiz,et al.  Gamma-Ray Bursts in the Swift Era , 2009, 0909.1531.

[22]  M. D. Valle.  Supernova and GRB connection: Observations and Questions , 2006, astro-ph/0604110.

[23]  D. Giannios.  Prompt emission spectra from the photosphere of a GRB , 2006, astro-ph/0602397.

[24]  M. Lyutikov.  The electromagnetic model of gamma-ray bursts , 2005, astro-ph/0512342.

[25]  C. Bianco,et al.  The Blackholic energy: long and short Gamma‐Ray Bursts (New perspectives in physics and astrophysics from the theoretical understanding of Gamma‐Ray Bursts, II) , 2005, astro-ph/0503476.

[26]  J. Truemper.  Observations of Cooling Neutron Stars , 2005, astro-ph/0502457.

[27]  C. Bianco,et al.  On the Exact Analytic Expressions for the Equitemporal Surfaces in Gamma-Ray Burst Afterglows , 2005, astro-ph/0501390.

[28]  C. Bianco,et al.  On the Instantaneous Spectrum of Gamma-Ray Bursts , 2004, astro-ph/0405284.

[29]  Scott D. Barthelmy,et al.  The Burst Alert Telescope (BAT) on the SWIFT Midex Mission , 2004, SPIE Optics + Photonics.

[30]  C. Bianco,et al.  Exact versus Approximate Equitemporal Surfaces in Gamma-Ray Burst Afterglows , 2004, astro-ph/0403379.

[31]  D. Watson,et al.  The Swift X-Ray Telescope , 1999, SPIE Optics + Photonics.

[32]  R. Ruffini.  The ergosphere and dyadosphere of black holes , 2004 .

[33]  M. Galassi,et al.  GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY , 2004 .

[34]  C. Bianco,et al.  New perspectives in physics and astrophysics from the theoretical understanding of Gamma‐Ray Bursts , 2003, astro-ph/0302557.

[35]  S. Penner.  Physics of shock waves and high-temperature hydrodynamic phenomena - Ya.B. Zeldovich and Yu.P. Raizer (translated from the Russian and then edited by Wallace D. Hayes and Ronald F. Probstein); Dover Publications, New York, 2002, 944 pp., $34. , 2003 .

[36]  J. van Paradijs,et al.  UvA-DARE ( Digital Academic Repository ) Gamma-Ray Burst afterglows , 2000 .

[37]  K. Mukai,et al.  ASCA Observation of the Dipping X-Ray Source XB 1916–053 , 1999 .

[38]  T. Piran.  Gamma-ray bursts and the fireball model , 1998, astro-ph/9810256.

[39]  E. Waxman,et al.  Gamma-Ray Burst Afterglow: Polarization and Analytic Light Curves , 1998, astro-ph/9807111.

[40]  T. Piran,et al.  Images and Spectra from the Interior of a Relativistic Fireball , 1998, astro-ph/9806192.

[41]  R. Ruffini.  Beyond the Critical Mass: The Dyadosphere of Black Holes , 1998 .

[42]  Re'em Sari,et al.  Hydrodynamics of Gamma-Ray Burst Afterglow , 1997 .

[43]  P. Mészáros,et al.  Rings in Fireball Afterglows , 1997, astro-ph/9709284.

[44]  E. Waxman.  Angular Size and Emission Timescales of Relativistic Fireballs , 1997, astro-ph/9709190.

[45]  G. Guo,et al.  Reply to the comment , 1997, quant-ph/9710014.

[46]  H. Kleinert,et al.  On Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories , 1996 .

[47]  M. Rees,et al.  Gasdynamics of relativistically expanding gamma-ray burst sources : kinematics, energetics, magnetic fields, and efficiency , 1993, astro-ph/9301007.

[48]  R. Klebesadel.  The durations of gamma-ray bursts. , 1992 .

[49]  B. Paczyński.  Gamma-ray bursters at cosmological distances , 1986 .

[50]  J. Goodman,et al.  Are gamma-ray bursts optically thick? , 1986 .

[51]  P. Seymour.  Black Holes, White Dwarfs and Neutron Stars: The Physics of Compact Objects , 1984 .

[52]  E. M. Lifshitz,et al.  Statistical physics. Pt.1, Pt.2 , 1980 .

[53]  E. Segre.  Nuclei and particles : an introduction to nuclear and subnuclear physics , 2013 .

[54]  Robert Martin Eisberg,et al.  Quantum Physics of Atoms, Molecules, Solids, Nuclei, and Particles, 2nd Edition , 1974 .

[55]  R. Ruffini.  On the energetics of black holes. , 1973 .

[56]  L. Elton.  Atomic Physics , 1966, Nature.

[57]  W. Fite,et al.  Electronic and Atomic Collisions. , 1965, Science.

[58]  J. Synge,et al.  Relativity: The General Theory , 1960 .

[59]  E. M. Lifshitz,et al.  Classical theory of fields , 1952 .

[60]  G. Gamow.  Constitution of Atomic Nuclei and Radioactivity , 1932, Nature.