Vergani 2007 GRB 060418 的红外余辉观测

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astro-ph/0701688 [abs, ps, pdf, other] :

Title: REM observations of GRB 060418: the fireball Lorentz factor determination
Authors: S.D. Vergani (on behalf of the REM collaboration)
Comments: 2 pages, 1 eps figure. Proceedings of the "Swift and GRBs: Unveiling the Relativistic Universe" meeting, Venice, June 5-9, 2006, to be published by "Il Nuovo Cimento"

We measured the fireball Lorentz factor of GRB 060418 by the direct observation of the onset of the NIR afterglow carried with the REM telescope. We found a value of about 400.