Single- and Two-Component GRB Spectra in the Fermi GBM-LAT Energy Range

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1 Single- and Two-Component GRB Spectra in the Fermi GBM-LAT Energy Range Péter Veres and Péter Mészáros Dept. of Astronomy & Astrophysics, Dept. of Physics and Center for Particle Astrophysics Pennsylvania State University arxiv: /7/2012 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 1 / 16

2 Overview 1 Introduction 2 Magnetic dynamics 3 Radiation components Prompt emission Radiation from r dec 4 Example spectra Theoretical Observed 5 Conclusions Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 2 / 16

3 Introduction Before Fermi - EGRET and projections for LAT Extra component and/or cutoff Hints of extra PL component González et al. (2003) LAT GRBs predicted Band et al. (2009) -higher than observed Sign of tentative cutoff in prompt (Kocevski et al ) Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 3 / 16

4 Introduction Before Fermi - EGRET and projections for LAT Extra component and/or cutoff Hints of extra PL component González et al. (2003) LAT GRBs predicted Band et al. (2009) -higher than observed Sign of tentative cutoff in prompt (Kocevski et al ) Number Of Photons Detected Number Of GRB/yr 10 1 >10 GeV All selected Burst Only bursts with Beta<-2 >100 MeV >1 GeV Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 3 / 16

5 Introduction Before Fermi - EGRET and projections for LAT Extra component and/or cutoff Hints of extra PL component González et al. (2003) LAT GRBs predicted Band et al. (2009) -higher than observed Sign of tentative cutoff in prompt (Kocevski et al ) Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 3 / 16

6 Introduction Fermi GBM/LAT observations GRB C -smooth Band function GRB B -extra power law comp. GRB A -extra PL comp.+ break goals: reproduce simple PL high energy behaviour, extra PL and cutoff Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 4 / 16

7 Introduction Fermi GBM/LAT observations GRB C -smooth Band function GRB B -extra power law comp. GRB A -extra PL comp.+ break goals: reproduce simple PL high energy behaviour, extra PL and cutoff Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 4 / 16

8 Introduction Fermi GBM/LAT observations GRB C -smooth Band function GRB B -extra power law comp. GRB A -extra PL comp.+ break goals: reproduce simple PL high energy behaviour, extra PL and cutoff Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 4 / 16

9 Introduction Fermi GBM/LAT observations GRB C -smooth Band function GRB B -extra power law comp. GRB A -extra PL comp.+ break goals: reproduce simple PL high energy behaviour, extra PL and cutoff Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 4 / 16

10 Magnetic dynamics Magnetically dominated jets Magnetic dynamics: Γ r 1/3 (baryonic Γ r) ɛ B goes from 1 in the prompt to 10 1 at r dec Dissipative photosphere: reconnection, weak shocks, turbulence Photosphere in accelerating phase Previous studies: Band-like prompt spectrum naturally arises -Vurm et al. 2011, Thompson 1994, Giannios and Spruit 2007 η barionic model Γ phot. Γ~R Γ~R 1/3 magnetic model R R phot. saturation deceleration R Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 5 / 16

11 Radiation components Radiation Sources- Two Zone Model Prompt component from photosphere (e.g. Beloborodov 2010) FS/RS synchrotron Prompt up-scatters on FS/RS electrons (Murase et al., 2011) FS/RS SSC (Sari & Esin, 2001) BB, BB+FS, BB+RS (Ryde, 2005; Ando & Mészáros, 2008) p + sync., FS+RS, RS+FS (Razzaque et al., 2009, He et al., 2011) Max synch./kn cutoffs (Guetta & Granot, 2003) R ph R dec RS FS RS EIC FS EIC Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 6 / 16

12 Radiation components Prompt emission Prompt Emission from Magnetic Dissipation Magnetic energy dissipates at r ph (e.g. semirelativistic shocks) (Giannios 2007, Lazzati & Begelman 2011, Mészáros & Rees, 2011, McKinney & Uzdensky 2011) E.g. Alfvénic turbulence naturally produces the Band function with α = 1, β = 2 (Thompson, 1994) Prompt peak is synchrotron radiation from photosphere r ph = cm L 3/5 t,53 r2/5 0,7 η 3/ AU Γ ph = (r ph /r 0 ) 1/3 = 87 L 1/5 t,53 ζ1/5 r r 1/5 0,7 η 1/5 600 ε obs ph,syn = 310 kev ζ 1/2 r (1 ζ r ) 1/2 r 1/2 0,7 ɛ1/2 B,0 Γ r 3 ( 1+z ) 1 2 weak thermal component T(r ph ) = 2.7 kev L 1/60 t,53 ζr 4/15 η 4/ r 7/30 0,7 Γr 1/2 ( 1+z ) 1 2 Pairs at the photosphere? -consider both cases. Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 7 / 16

13 Radiation components Forward- and Reverse Shock Radiation from r dec At r dec = cm 3000 AU ɛ B goes from 1 to 10 1 Fmax(ε FS c ) = 0.15 Jy ε c = 3.7 ev (UV) FAST cooling F RS ε RS m max(ε m ) = 92 Jy = kev (FIR) SLOW cooling Cutoff at ε(γ MAX ) Does a RS develop?- take both cases R ph R dec RS FS RS EIC FS EIC Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 8 / 16

14 Radiation components External inverse Compton Radiation from r dec τ RS = τ FS = cutoff and peak at ε KN (γ) εf peak ε,rseic ε brn ε,p τ RS ε RSEIC KN = erg cm 2 s 1 εf peak ε,fseic ε brn ε,p τ FS ε FSEIC KN = erg cm 2 s 1 R ph R dec RS FS RS EIC FS EIC Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 9 / 16

15 Example spectra Theoretical Example theoretical spectrum with pair cutoff 10 6 prompt εfε erg cm 2 s FS RS-EIC 10 8 RS BB FS-SSC FS-EIC pairs RS-SSC ε MeV L t = erg/s, ζ r = 0.6, n = 10 cm 3, η = 600, ɛ B,pr = 1, ɛ B,FS = ɛ B,RS = 10 2, ɛ e,fs = ɛ e,rs = 10 2, r 0 = 10 7 cm, z = 1, β = 2.4, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 10 / 16

16 Example spectra Theoretical Example theoretical spectrum with pair cutoff 10 6 prompt εfε erg cm 2 s FS RS-EIC 10 8 RS BB FS-SSC FS-EIC pairs RS-SSC ε MeV L t = erg/s, ζ r = 0.6, n = 10 cm 3, η = 600, ɛ B,pr = 1, ɛ B,FS = ɛ B,RS = 10 2, ɛ e,fs = ɛ e,rs = 10 2, r 0 = 10 7 cm, z = 1, β = 2.4, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 10 / 16

17 Example spectra Theoretical Example theoretical spectrum with pair cutoff 10 6 prompt εfε erg cm 2 s FS RS-EIC 10 8 RS BB FS-SSC FS-EIC pairs RS-SSC ε MeV L t = erg/s, ζ r = 0.6, n = 10 cm 3, η = 600, ɛ B,pr = 1, ɛ B,FS = ɛ B,RS = 10 2, ɛ e,fs = ɛ e,rs = 10 2, r 0 = 10 7 cm, z = 1, β = 2.4, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 10 / 16

18 Example spectra Theoretical Example spectra: model with no pair cutoff prompt εfε erg cm 2 s FS RS-EIC RS BB FS-SSC FS-EIC ε MeV L t = erg/s, ζ r = 0.5, n = 30 cm 3, η = 400, ɛ B,pr = 1, ɛ B,FS = ɛ B,RS = , ɛ e,fs = ɛ e,rs = , r 0 = 10 7 cm, z = 1, β = 2.5, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 11 / 16

19 Example spectra Theoretical Example spectra: model with no pair cutoff prompt εfε erg cm 2 s FS RS-EIC RS BB FS-SSC FS-EIC ε MeV L t = erg/s, ζ r = 0.5, n = 30 cm 3, η = 400, ɛ B,pr = 1, ɛ B,FS = ɛ B,RS = , ɛ e,fs = ɛ e,rs = , r 0 = 10 7 cm, z = 1, β = 2.5, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 11 / 16

20 Example spectra Theoretical Example spectra: model with no pair cutoff prompt εfε erg cm 2 s RS FS RS-EIC FS-SSC RS-SSC BB FS-EIC ε MeV L t = erg/s, ζ r = 0.6, n = 10 2 cm 3, η = 400, ɛ B,pr = 0.9, ɛ B,FS = 10 2, ɛ e,fs = , r 0 = 10 7 cm, z = 1, β = 2.4, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 12 / 16

21 Example spectra Theoretical Example spectra: model with no pair cutoff prompt εfε erg cm 2 s RS FS RS-EIC FS-SSC RS-SSC BB FS-EIC ε MeV L t = erg/s, ζ r = 0.6, n = 10 2 cm 3, η = 400, ɛ B,pr = 0.9, ɛ B,FS = 10 2, ɛ e,fs = , r 0 = 10 7 cm, z = 1, β = 2.4, p = 2.4 Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 12 / 16

22 Example spectra Observed Example: fitting the model to Fermi measurements 1. Data provided by Bin-Bin Zhang (Veres, Zhang and Mészáros in prep.) Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 13 / 16

23 Example spectra Observed Example: fitting the model to Fermi measurements 2. Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 14 / 16

24 Example spectra Observed Example: fitting the model to Fermi measurements 3. Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 15 / 16

25 Conclusions Conclusions Magnetic model fits well Fermi GBM/LAT data Good for inetrpreting observations External IC needed for additional PL comp. If RS is present, strong extra component Can reproduce: -smooth Band spectrum -Band spectrum + extra PL component + cutoff for more, please see: arxiv: Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 16 / 16

26 Backup slides Why we do not invoke internal shocks? Internal shocks are radiatively inefficient and also are typically expected at radii r is = ctγ t v, 3 Γ3 2 cm, too small for both showing small variability and to allow GeV photons to escape (R γγ cm). Dissipative photospheres can be 50% radiatively efficient; their spectrum reproduce the Band function, with a peak which is thermal (baryonic dyn) or synchrotron (mag.dyn), and where low and high energy slopes are due to scattering (baryonic) and or Synch/IC (magn dyn) - see Thompson 94, Rees, Mészáros05, Pe er, Mészáros, Rees 06 and Beloborodov 11. Magnetic dynamics: useful because (a) suspect mag. fields dominant in high E iso bursts (since need Blandford-Znajek), (b) dissipation very efficient due to reconnection, (c) spectrum is Band-like (Giannios 07, Thompson 94 or Vurm 11). Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 17 / 16

27 Time resolved spectra, e.g C work in progress Péter Veres and Péter Mészáros (PSU) Multicomponent HE spectra GRB conf. 2012, München 18 / 16

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