2015ApJ...806...64P

Query : 2015ApJ...806...64P

2015ApJ...806...64P - Astrophys. J., 806, 64 (2015/June-2)

Optical flashes from internal pairs formed in gamma-ray burst afterglows.

PANAITESCU A.

Abstract (from CDS):

We develop a numerical formalism for calculating the distribution with energy of the (internal) pairs formed in a relativistic source from unscattered MeV-TeV photons. For gamma-ray burst (GRB) afterglows, this formalism is more suitable if the relativistic reverse shock that energizes the ejecta is the source of the GeV photons. The number of pairs formed is set by the source GeV output (calculated from the Fermi-LAT fluence), the unknown source Lorentz factor, and the unmeasured peak energy of the LAT spectral component. We show synchrotron and inverse-Compton light curves expected from pairs formed in the shocked medium and identify some criteria for testing a pair origin of GRB optical counterparts. Pairs formed in bright LAT afterglows with a Lorentz factor in the few hundreds may produce bright optical counterparts () lasting for up to one hundred seconds. The number of internal pairs formed from unscattered seed photons decreases very strongly with the source Lorentz factor, thus bright GRB optical counterparts cannot arise from internal pairs if the afterglow Lorentz factor is above several hundreds.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: general - gamma-ray burst: individual: GRB 130427A - methods: numerical - radiation mechanisms: non-thermal - relativistic processes - shock waves

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SN 2013cq SN* 11 32 32.84 +27 41 56.2           SNIc 613 1

Query : 2015ApJ...806...64P

Basic data :
SN 2013cq -- SuperNova
Other object types: otypes_help 		gB (2016ApJS,Fermi,...), SN* (2016ApJ,SN), Rad (2018MNRAS)
ICRS coord. (ep=J2000) : 		11 32 32.84 +27 41 56.2 [ ] D 2008yCat....1.2024B
FK4 coord. (ep=B1950 eq=1950) : 		11 29 54.67 +27 58 30.4 [ ]
Gal coord. (ep=J2000) : 		206.50750 +72.50140 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 85318 [~] / z(~) 0.34 [~] / cz 101929 [~]
   D 2015MNRAS.454.1711B
Spectral type: 		SNIc D 2008yCat....1.2024B
Fluxes (3) :
J (AB) 13.69 [0.04] C 2015MNRAS.449.2919L
H (AB) 13.73 [0.04] C 2015MNRAS.449.2919L
i (AB) 13.88 [0.04] C 2015MNRAS.449.2919L
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Hierarchy : number of linked objects
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Identifiers (4) :
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SN 2013cq CRTS CSS130502 J113233+274156 Fermi bn130427324 GRB 130427A

References (613 between 1850 and 2026) (Total 613)
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