Evidence for a Bright-edged Jet in the Optical/Near-infrared Afterglow of GRB 160625B

被引：5
|
作者：
Strausbaugh, Robert [1 ]
Butler, Nathaniel [2 ]
Lee, William H. [3 ]
Troja, Eleonora [4 ,5 ]
Watson, Alan M. [3 ]
机构：
[1] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA
[2] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[3] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico
[4] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[5] NASA, Goddard Space Flight Ctr, Washington, DC 20546 USA
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 873卷 / 01期
关键词：
gamma-ray burst: general; gamma-ray burst: individual (GRB 160625B); stars: jets; GAMMA-RAY BURST; LIGHT-CURVES; LUMINOSITY FUNCTION; SWIFT; ENERGY; EVOLUTION; FLARES; DUST; ENERGETICS; TELESCOPE;
D O I：
10.3847/2041-8213/ab07c0
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using deep and high-cadence gamma-ray burst (GRB) afterglow data from the Reionization And Transients InfraRed/Optical camera, we observe a sharp and achromatic light curve break 12.6 days after the GRB, accompanied by an approximately achromatic bump. Fitting of the optical, near-infrared, and X-ray data suggest a very narrow (2 degrees) jet that remains collimated at late time. We argue that the sharp light curve bump suggests an edge-brightened jet, perhaps emitting only during a brief period of lateral jet expansion. The light curve also exhibits a gradual spectral evolution lasting >10 days. The evolution of the flux can be modeled as Flux similar to(t/[120 days])(alpha)(lambda/[800 nm])(beta) with a temporal slope alpha = -0.956 +/- 0.003 and a gradually time-varying spectral slope beta = (0.60. +/- 0.07 +/- (0.26 +/- 0.06)log(t/20 days).
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页数：7
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