TITLE: GCN CIRCULAR NUMBER: 28668 SUBJECT: GRB 201015A: classification as long GRB DATE: 20/10/17 12:55:23 GMT FROM: Alexei Pozanenko at IKI, Moscow P. Minaev (IKI) and A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We analyzed GRB 201015A detected by Swift (D'Elia et al., GCN 28632) using GBM/Fermi spectral data (Fletcher et al., GCN 28663) and redshift of z = 0.426 (de Ugarte Postigo et al., GCN 28649; Izzo et al., GCN 28661). GRB 201015A has a low luminosity, Eiso = (1.1 +/- 0.2)*10^50 erg, and well consistent with the Ep,i – Eiso correlation (Amati relation) for type II (long) bursts, see [1] for details and Figure at http://grb.rssi.ru/GRB201015A/GRB201015A_Epi_Eiso.png The position of the burst is within 1-sigma confidence area of the cluster of type II (long) bursts on the EH – T90,i diagram (see [2] for details), indicating strong association with type II bursts, see Figure at http://grb.rssi.ru/GRB201015A/GRB201015A_EH_T90i.png We encourage follow-up optical observations to search for associated supernova. [1] - Minaev et al., MNRAS, 492, 1919, 2020 [2] - Minaev et al., arXiv:2008.12752