The Late Peaking Afterglow of GRB 100418A

Details The Late Peaking Afterglow of GRB 100418A The Late Peaking Afterglow of GRB 100418A

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...727..132m&link_type=abstract

The Astrophysical Journal, Volume 727, Issue 2, article id. 132 (2011).

Astronomy and Astrophysics

Astronomy

6

Gamma-Ray Burst: Individual: Grb 100418A

Scientific paper

GRB 100418A is a long gamma-ray burst (GRB) at redshift z = 0.6235 discovered with the Swift Gamma-ray Burst Explorer with unusual optical and X-ray light curves. After an initial short-lived, rapid decline in X-rays, the optical and X-ray light curves observed with Swift are approximately flat or rising slightly out to at least ~7 × 103 s after the trigger, peak at ~5 × 104 s, and then follow an approximately power-law decay. Such a long optical plateau and late peaking is rarely seen in GRB afterglows. Observations with Rapid Eye Mount during a gap in the Swift coverage indicate a bright optical flare at ~2.5 × 104 s. The long plateau phase of the afterglow is interpreted using either a model with continuous injection of energy into the forward shock of the burst or a model in which the jet of the burst is viewed off-axis. In both models the isotropic kinetic energy in the late afterglow after the plateau phase is >=102 times the 1051 erg of the prompt isotropic gamma-ray energy release. The energy injection model is favored because the off-axis jet model would require the intrinsic T 90 for the GRB jet viewed on-axis to be very short, ~10 ms, and the intrinsic isotropic gamma-ray energy release and the true jet energy to be much higher than the typical values of known short GRBs. The non-detection of a jet break up to t ~ 2 × 106 s indicates a jet half-opening angle of at least ~14°, and a relatively high-collimation-corrected jet energy of E jet >= 1052 erg.

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