首页|GRB 200612A:An Ultralong Gamma-Ray Burst Powered by Magnetar Spinning Down
GRB 200612A:An Ultralong Gamma-Ray Burst Powered by Magnetar Spinning Down
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
GRB 200612A could be classified as an ultralong gamma-ray burst due to its prompt emission lasting up to～1020 s and the true timescale of the central engine activity tburst ≥ 4 × 104 s.The late X-ray light curve with a decay index of α=7.53 is steeper than the steepest possible decay from an external shock model.We propose that this X-ray afterglow can be driven by dipolar radiation from the magnetar spindown during its early stage,while the magnetar collapsed into the black hole before its spindown,resulting in a very steep decay of the late X-ray light curve.The optical data show that the light curve is still rising after 1.1 ks,suggesting a late onset.We show that GRB 200612A's optical afterglow light curve is fitted with the forward shock model by Gaussian structured off-axis jet.This is a special case among GRBs,as it may be an ultralong gamma-ray burst powered by a magnetar in an off-axis observation scenario.
万方数据
维普
