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Discovery of sn 2009nz associated with grb 091127

Cobb, BE, Bloom, JS, Perley, DA, Morgan, AN, Cenko, SB and Filippenko, AV (2010) Discovery of sn 2009nz associated with grb 091127. The Astrophysical Journal Letters, 718 (2). L150-L155. ISSN 2041-8205

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We report SMARTS, Gemini, and Swift-UVOT observations of the optical transient (OT) associated with gamma-ray burst (GRB) 091127, at redshift 0.49, taken between 0.9 hr and 102 days following the Swift trigger. In our early-time observations, the OT fades in a manner consistent with previously observed GRB afterglows. However, after nine days post-burst, the OT is observed to brighten for a period of ∼two weeks, after which the source resumes fading. A comparison of this late-time "bump" to SN 1998bw (the broad-lined Type Ic supernova associated with GRB 980425), and several other GRB supernovae (SNe), indicates that the most straightforward explanation is that GRB 091127 was accompanied by a contemporaneous SN (SN 2009nz) that peaked at a magnitude of MV = -19.0 ± 0.2. SN 2009nz is globally similar to other GRB SNe, but evolves slightly faster than SN 1998bw and reaches a slightly dimmer peak magnitude.We also analyze the early-time UV-optical-IR spectral energy distribution of the afterglow of GRB 091127 and find that there is little to no reddening in the host galaxy along the line of sight to this burst. © 2010 The American Astronomical Society.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 23 May 2017 09:54
Last Modified: 20 Apr 2022 09:37
DOI or ID number: 10.1088/2041-8205/718/2/L150
URI: https://researchonline.ljmu.ac.uk/id/eprint/6496
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