Spectroscopic Evidence for SN 2010ma Associated with GRB 101219B

TY - JOUR

T1 - Spectroscopic Evidence for SN 2010ma Associated with GRB 101219B

AU - Sparre....[et al.], M.

AU - Sollerman, Jesper Olof

AU - Fynbo, Johan Peter Uldall

AU - Malesani, Daniele

AU - Ugarte Postigo, Antonio de

AU - Hjorth, Jens

AU - Leloudas, Georgios

AU - Milvang-Jensen, Bo

AU - Watson, Darach Jafar

PY - 2011/7/1

Y1 - 2011/7/1

N2 - We report on the spectroscopic detection of supernova SN 2010ma associated with the long gamma-ray burst GRB 101219B. We observed the optical counterpart of the GRB on three nights with the X-shooter spectrograph at the Very Large Telescope. From weak absorption lines, we measure a redshift of z = 0.55. The first-epoch UV-near-infrared afterglow spectrum, taken 11.6 hr after the burst, is well fit by a power law consistent with the slope of the X-ray spectrum. The second- and third-epoch spectra (obtained 16.4 and 36.7days after the burst), however, display clear bumps closely resembling those of the broad-lined type-Ic SN 1998bw if placed at z = 0.55. Apart from demonstrating that spectroscopic SN signatures can be observed for GRBs at these large distances, our discovery makes a step forward in establishing a general connection between GRBs and SNe. In fact, unlike most previous unambiguous GRB-associated SNe, GRB 101219B has a large gamma-ray energy (E iso = 4.2 × 1051 erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs.

AB - We report on the spectroscopic detection of supernova SN 2010ma associated with the long gamma-ray burst GRB 101219B. We observed the optical counterpart of the GRB on three nights with the X-shooter spectrograph at the Very Large Telescope. From weak absorption lines, we measure a redshift of z = 0.55. The first-epoch UV-near-infrared afterglow spectrum, taken 11.6 hr after the burst, is well fit by a power law consistent with the slope of the X-ray spectrum. The second- and third-epoch spectra (obtained 16.4 and 36.7days after the burst), however, display clear bumps closely resembling those of the broad-lined type-Ic SN 1998bw if placed at z = 0.55. Apart from demonstrating that spectroscopic SN signatures can be observed for GRBs at these large distances, our discovery makes a step forward in establishing a general connection between GRBs and SNe. In fact, unlike most previous unambiguous GRB-associated SNe, GRB 101219B has a large gamma-ray energy (E iso = 4.2 × 1051 erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs.

U2 - 10.1088/2041-8205/735/1/L24

DO - 10.1088/2041-8205/735/1/L24

M3 - Journal article

SN - 0004-637X

VL - 735

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -