Spectroscopic evidence for SN 2010ma associated with GRB 101219B

Abstract

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 VLT. 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 36.7 days 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 x 10^{51} erg), a bright afterglow, and obeys the "Amati" relation, thus being fully consistent with the cosmological population of GRBs.

8 pages, 3 figures, 2 tables, letter, accepted by ApJ

References in corpus (11)

• The Supernova -- Gamma-Ray Burst Connection
• An optical supernova associated with the X-ray flash XRF 060218
• The Galaxy Population Hosting Gamma-Ray Bursts
• Discovery of the nearby long, soft GRB 100316D with an associated supernova
• Swift Identification of Dark Gamma-Ray Bursts
• Supernova 2006aj and the associated X-Ray Flash 060218
• A Comparison of the Afterglows of Short- and Long-Duration Gamma-Ray Bursts
• On the consistency of the peculiar GRBs 060218 and 060614 with the Ep,i - Eiso correlation
• Hypernova Signatures in the Late Rebrightening of GRB 050525A
• A High Signal-to-Noise Ratio Composite Spectrum of Gamma-ray Burst Afterglows
• Spectroscopic Discovery of the Broad-Lined Type Ic Supernova 2010bh Associated with the Low-Redshift GRB 100316D