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GRB 200612A: An Ultralong Gamma-Ray Burst Powered by Magnetar Spinning Down
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2024-02-07 , DOI: 10.1088/1674-4527/ad1d2a Liang-Jun 良军 Chen 陈 , Xiang-Gao 祥高 Wang 王 , De-Long 德龙 Yang 杨 , En-Wei 恩维 Liang 梁
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2024-02-07 , DOI: 10.1088/1674-4527/ad1d2a Liang-Jun 良军 Chen 陈 , Xiang-Gao 祥高 Wang 王 , De-Long 德龙 Yang 杨 , En-Wei 恩维 Liang 梁
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 t
burst ≥ 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.
更新日期：2024-02-07
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