TITLE:   GCN CIRCULAR
NUMBER:  31465
SUBJECT: GRB 220101A: The most powerful GRB and BDHN I in 26 years
DATE:    22/01/17 11:00:26 GMT
FROM:    Remo Rufinni at ICRA  <ruffini@icra.it>

R. Ruffini, Y. Aimuratov, L. Becerra, C.L. Bianco, Y-C. Chen, C. Cherubini,
Y.F. Cai, S. Eslamzadeh, S. Filippi, M. Karlica, Liang Li, G.J. Mathews, R.
Moradi, M. Muccino, G.B, Pisani, F. Rastegar Nia, J.A. Rueda, N. Sahakyan,
Y. Wang,  S.S. Xue,  Y.F. Yuan, Y.L. Zheng, on behalf of ICRA, ICRANet and
USTC team, report:


GRB 220101A, first detected by Swift (Tohuvavohu et al., GCN 31347) with
redshift z=4.618 (Fu et al 2022., GCN 31353; Fynbo et al 2022., GCN 31359)
and energy of 3.7E54 (J.-L. Atteia 2022, GCN 31365) is categorized as a
BdHN I with the most powerful and the highest ever observed X-ray afterglow
luminosity in 26 years, as well as the highest supernova rise (SN-rise) and
the new neutron star rise (vNS-rise) (Ruffini et al. 2021 MNRAS, 504, 5301)
see Fig. 1. There is evidence for the ultrarelativistic prompt emission
(UPE) phase (Moradi et al. 2021 PRD 104, 063043).

We encourage optical and radio observations to identify the corresponding
UPE phase as well as the synchrotron emission originating from the spinning
vNS.


Fig. 1: http://www.icranet.org/figure1.pdf