A magnetically driven origin for the low luminosity GRB 170817A associated with GW170817

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2018,（6）
• 页码范围: 119-124
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-4527/18/6/67

摘要

The gamma-ray burst GR170817A associated with GW170817 is subluminous and subenergetic compared with other typical short gamma-ray bursts.It may be due to a relativistic jet viewed off-axis,or a structured jet or cocoon emission.Giant flares from magnetars may possibly be ruled out.However,the luminosity and energetics of GRB 170817A are coincident with those of magnetar giant flares.After the coalescence of a binary neutron star,a hypermassive neutron star may be formed.The hypermassive neutron star may have a magnetar-strength magnetic field.During the collapse of this hypermassive neutron star,magnetic field energy will also be released.This giant-flare-like event may explain the luminosity and energetics of GRB 170817A.Bursts with similar luminosity and energetics are expected in future neutron star-neutron star or neutron star-black hole mergers.