Ultra-long-duration gamma-ray burst GRB 111209A was found to be associated with a very luminous supernovae (SNe) SN 2011kl. The physics of GRB 111209A/SN 2011kl has been extensively studied in the literures, but does not settle down yet. By investigating in detail the characteristics of the X-ray light curve of GRB 111209A, coupled with the temporal and spectral features observed in SN 2011kl, we argue that a short-living supramassive magnetar can be responsible for the initial shallow X-ray emission. Then the electromagnetic extraction of spin energy from a black hole results in the steeply declining X-ray flux when the magnetar collapses into a black hole (BH). A fraction of the envelope materials falls back and activates the accretion onto the newborn BH, which produces the X-ray rebrightening bump at late times. During this process, a centrifugally driven baryon-rich quasi-isotropic Blandford \& Payne outflow from the revived accretion disk deposits its kinetic energy on the SN ejecta, which powers luminous SN 2011kl. Finally, we place a limitation on the magnetar's physical parameters based on the observations.

中文翻译：

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GRB 111209A/SN 2011kl：具有 r 模式振荡和回落吸积的超大质量磁星坍缩到新生黑洞上

超长持续时间伽马射线暴 GRB 111209A 被发现与一颗非常明亮的超新星 (SNe) SN 2011kl 相关。GRB 111209A/SN 2011kl 的物理学已在文献中得到广泛研究，但尚未确定下来。通过详细研究 GRB 111209A 的 X 射线光变曲线的特征，再加上在 SN 2011kl 中观察到的时间和光谱特征，我们认为一个短寿命的超大质量磁星可能是初始浅层 X 射线发射的原因。然后，当磁星坍缩成黑洞 (BH) 时，从黑洞中提取自旋能量的电磁能导致 X 射线通量急剧下降。一小部分信封材料回落并激活新生 BH 上的吸积物，这会在后期产生 X 射线重新增亮凸起。在这个过程中，离心驱动的富含重子的准各向同性 Blandford \& Payne 从复活的吸积盘流出，将其动能沉积在 SN 喷射物上，为发光的 SN 2011kl 提供动力。最后，我们根据观测对磁星的物理参数进行了限制。