TY - JOUR

T1 - The bright gamma-ray burst of 2000 February 10: A case study of an optically dark gamma-ray burst

A1 - Piro,L.

A1 - Frail,D.A.

A1 - Gorosabel,J.

A1 - Garmire,G.

A1 - Soffitta,P.

A1 - Amati,L.

A1 - Andersen,M.I.

A1 - Antonelli,L.A.

A1 - Berger,E.

A1 - Frontera,F.

A1 - Fynbo,J.

A1 - Gandolfi,G.

A1 - Garcia,M.R.

A1 - Hjorth,J.

A1 - In't Zand,J.

A1 - Jensen,B.L.

A1 - Masetti,N.

A1 - Møller,Per

A1 - Pedersen,H.

A1 - Pian,E.

A1 - Wieringa,M.H.

AU - Piro,L.

AU - Frail,D.A.

AU - Gorosabel,J.

AU - Garmire,G.

AU - Soffitta,P.

AU - Amati,L.

AU - Andersen,M.I.

AU - Antonelli,L.A.

AU - Berger,E.

AU - Frontera,F.

AU - Fynbo,J.

AU - Gandolfi,G.

AU - Garcia,M.R.

AU - Hjorth,J.

AU - In't Zand,J.

AU - Jensen,B.L.

AU - Masetti,N.

AU - Møller,Per

AU - Pedersen,H.

AU - Pian,E.

AU - Wieringa,M.H.

PB - Institute of Physics Publishing, Inc

PY - 2002

Y1 - 2002

N2 - The gamma-ray burst GRB 000210 had the highest gamma-ray peak flux of any event localized by BeppoSAX as yet, but it did not have a detected optical afterglow, despite prompt and deep searches down to R-lim approximate to 23.5. It is therefore one of the events recently classified as dark GRBs, whose origin is still unclear. Chandra observations allowed us to localize the X-ray afterglow of GRB 000210 to within approximate to1", and a radio transient was detected with the Very Large Array. The precise X-ray and radio positions allowed us to identify the likely host galaxy of this burst and to measure its redshift, z = 0.846. The probability that this galaxy is a field object is approximate to1.6 x 10(-2). The X-ray spectrum of the afterglow shows significant absorption in excess of the Galactic one corresponding, at the redshift of the galaxy, to N-H = (5 +/- 1) x 10(21) cm(-2). The amount of dust needed to absorb the optical flux of this object is consistent with the above H I column density, given a dust-to-gas ratio similar to that of our Galaxy. We do not find evidence for a partially ionized absorber expected if the absorption takes place in a giant molecular cloud. We therefore conclude that either the gas is local to the GRB but is condensed in small-scale high-density (n greater than or similar to 10(9) cm(-3)) clouds, or the GRB is located in a dusty, gas-rich region of the Galaxy. Finally, we examine the hypothesis that GRB 000210 lies at z greater than or similar to 5 (and therefore that the optical flux is extinguished by Lyalpha forest clouds), but we conclude that the X-ray absorbing medium would have to be substantially thicker from that observed in GRBs with optical afterglows.

AB - The gamma-ray burst GRB 000210 had the highest gamma-ray peak flux of any event localized by BeppoSAX as yet, but it did not have a detected optical afterglow, despite prompt and deep searches down to R-lim approximate to 23.5. It is therefore one of the events recently classified as dark GRBs, whose origin is still unclear. Chandra observations allowed us to localize the X-ray afterglow of GRB 000210 to within approximate to1", and a radio transient was detected with the Very Large Array. The precise X-ray and radio positions allowed us to identify the likely host galaxy of this burst and to measure its redshift, z = 0.846. The probability that this galaxy is a field object is approximate to1.6 x 10(-2). The X-ray spectrum of the afterglow shows significant absorption in excess of the Galactic one corresponding, at the redshift of the galaxy, to N-H = (5 +/- 1) x 10(21) cm(-2). The amount of dust needed to absorb the optical flux of this object is consistent with the above H I column density, given a dust-to-gas ratio similar to that of our Galaxy. We do not find evidence for a partially ionized absorber expected if the absorption takes place in a giant molecular cloud. We therefore conclude that either the gas is local to the GRB but is condensed in small-scale high-density (n greater than or similar to 10(9) cm(-3)) clouds, or the GRB is located in a dusty, gas-rich region of the Galaxy. Finally, we examine the hypothesis that GRB 000210 lies at z greater than or similar to 5 (and therefore that the optical flux is extinguished by Lyalpha forest clouds), but we conclude that the X-ray absorbing medium would have to be substantially thicker from that observed in GRBs with optical afterglows.

KW - gamma-rays : bursts

KW - cosmology : observations

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

VL - 577

SP - 680

EP - 690

ER -