2005A&A...443L...1T

Query : 2005A&A...443L...1T

2005A&A...443L...1T - Astronomy and Astrophysics, volume 443L1-5 (2005/11-3)

GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang.

TAGLIAFERRI G., ANTONELLI L.A., CHINCARINI G., FERNANDEZ-SOTO A., MALESANI D., DELLA VALLE M., D'AVANZO P., GRAZIAN A., TESTA V., CAMPANA S., COVINO S., FIORE F., STELLA L., CASTRO-TIRADO A.J., GOROSABEL J., BURROWS D.N., CAPALBI M., CUSUMANO G., CONCIATORE M.L., D'ELIA V., FILLIATRE P., FUGAZZA D., GEHRELS N., GOLDONI P., GUETTA D., GUZIY S., HELD E.V., HURLEY K., ISRAEL G.L., JELINEK M., LAZZATI D., LOPEZ-ECHARRI A., MELANDRI A., MIRABEL I.F., MOLES M., MORETTI A., MASON K.O., NOUSEK J., OSBORNE J., PELLIZZA L.J., PERNA R., PIRANOMONTE S., PIRO L., DE UGARTE POSTIGO A. and ROMANO P.

Abstract (from CDS):

We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB050904. We derive a photometric redshift z=6.3, estimated from the presence of the Lyman break falling between the I and J filters. This is by far the most distant GRB known to date. Its isotropic-equivalent energy is 3.4x10⁵³erg in the rest-frame 110-1100keV energy band. Despite the high redshift, both the prompt and the afterglow emission are not peculiar with respect to other GRBs. We find a break in the J-band light curve at t_b=2.6±1.0d (observer frame). If we assume this is the jet break, we derive a beaming-corrected energy E_γ~(4/12)x10⁵¹erg. This limit shows that GRB050904 is consistent with the Amati and Ghirlanda relations. This detection is consistent with the expected number of GRBs at z>6 and shows that GRBs are a powerful tool to study the star formation history up to very high redshift.

Abstract Copyright: ∼

Journal keyword(s): cosmology: observations - early Universe - gamma rays: bursts - gamma rays: individual: GRB050904

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	GRB 050904	gB	00 54 50.794	+14 05 09.42						~	496	0

Query : 2005A&A...443L...1T

Basic data :

GRB 050904 -- Gamma-ray Burst
Other object types:	`gB (GRB)`, `UV (2009ApJ)`
ICRS coord. (ep=J2000) :	`00 54 50.794 +14 05 09.42 (Ultraviolet) [ 2300 2300 90 ] D 2009ApJ...690..163R`
FK4 coord. (ep=B1950 eq=1950) :	`00 52 13.194 +13 48 54.43 [ 2300 2300 90 ]`
Gal coord. (ep=J2000) :	`124.186243 -48.777496 [ 2300 2300 90 ]`
Radial velocity / Redshift / cz :	`V(km/s) 288733 [600] / z(~) 6.295 [0.002] / cz 1887194 [600] D 2006ApJ...637L..69W`

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GRB 050904

References (496 between 1850 and 2026) (Total 496)
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