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Interplanetary Network Localization of GRB991208 and the Discovery of its Afterglow

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arxiv astro-ph/0002116 v2 pith:YTOSZSOK submitted 2000-02-04 astro-ph

Interplanetary Network Localization of GRB991208 and the Discovery of its Afterglow

classification astro-ph
keywords arcminburstcounterparteartherrorinterplanetarynearnetwork
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The extremely energetic (~10^-4 erg/cm^2) gamma-ray burst (GRB) of 1999 December 8 was triangulated to a ~14 sq. arcmin. error box ~1.8 d after its arrival at Earth with the 3rd interplanetary network (IPN), consisting of the Ulysses, Near Earth Asteroid Rendezvous (NEAR), and WIND spacecraft. Radio observations with the Very Large Array ~2.7 d after the burst revealed a bright fading counterpart whose position is consistent with that of an optical transient source whose redshift is z=0.707. We present the time history, peak flux, fluence, and refined 1.3 sq. arcmin. error box of this event, and discuss its energetics. This is the first time that a counterpart has been found for a GRB localized only by the IPN.

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