We examine gamma-ray and optical data of GRB 091024, a gamma-ray burst (GRB) with an extremely long duration of T90 ≈ 1020 s, as observed with the Fermi Gamma-Ray Burst Monitor (GBM). We present spectral analysis of all three distinct emission episodes using data from Fermi/GBM. and compare the optical and gamma-ray light curves of this event. We find that the optical light curve is highly anti-correlated to the prompt gamma-ray emission, with the optical emission reaching the maximum during an epoch of quiescence in the prompt emission.We interpret this behavior as the reverse shock (optical flash).
Fermi/GBM observations of the ultra-long GRB 091024 / Gruber, D; Krühler, T.; Foley, S.; Nardini, M.; Burlon, D.; Rau, A.; Bissaldi, E.; Von Kienlin, A.; Mcbreen, S.; Greiner, J.. - In: MEMORIE DELLA SOCIETÀ ASTRONOMICA ITALIANA SUPPLEMENTI. - ISSN 1824-0178. - STAMPA. - 21:(2012), pp. 235-238. (Intervento presentato al convegno GRBs as Probes: From the Progenitors Environment to the High redshift Universe tenutosi a Como, Italy nel May 16-20, 2011).
Fermi/GBM observations of the ultra-long GRB 091024
Bissaldi, E.;
2012-01-01
Abstract
We examine gamma-ray and optical data of GRB 091024, a gamma-ray burst (GRB) with an extremely long duration of T90 ≈ 1020 s, as observed with the Fermi Gamma-Ray Burst Monitor (GBM). We present spectral analysis of all three distinct emission episodes using data from Fermi/GBM. and compare the optical and gamma-ray light curves of this event. We find that the optical light curve is highly anti-correlated to the prompt gamma-ray emission, with the optical emission reaching the maximum during an epoch of quiescence in the prompt emission.We interpret this behavior as the reverse shock (optical flash).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
