Query : 2010A&A...510L...7G

2010A&A...510L...7G - Astronomy and Astrophysics, volume 510, L7-7 (2010/2-1)

The onset of the GeV afterglow of GRB 090510.


Abstract (from CDS):

We study the emission of the short/hard Gamma Ray Burst 090510 at energies >0.1 GeV as observed by the Large Area Telescope (LAT) onboard the Fermi satellite. The GeV flux rises in time as t2 up till 0.2s after the peak of the MeV pulse detected by the Fermi Gamma Burst Monitor (GBM) after which it decays as t–1.5 up to 200s. Its energy spectrum is consistent with F(ν)∝ν–1. The time behavior and the spectrum of the high energy LAT flux are strong evidences of an afterglow origin. We then interpret it as synchrotron radiation produced by the forward shock of a fireball with a bulk Lorentz factor Γ∼2000. The afterglow peak time is independent of energy in the 0.1-30GeV range and coincides with the arrival time of the highest energy photon (∼30GeV). Since the flux detected by the GBM and the LAT have different origins, the delay between these two components is not entirely due to possible violation of the Lorentz invariance. The LAT component alone allows us to set a reliable lower limit on the quantum-gravity mass of 4.7 times the Planck mass.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - radiation mechanisms: non-thermal - X-rays: general

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 354 0
2 GRB 060418 gB 15 45 42.600 -03 38 20.00 15.73 16.19 14.98     ~ 360 0
3 GRB 060607 gB 21 58 50.400 -22 29 46.70 18.49 16.67 15.09     ~ 295 0
4 GRB 090510 gB 22 14 12.60 -26 35 51.1           ~ 494 1

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