{
  "bibcode": "2022GCN.31865....1M",
  "body": "P. Minaev (IKI),  A. Pozanenko (IKI) report on behalf of GRB IKI FuN:\n\nWe analysed GRB 220408A detected by Fermi (Fermi GBM team, GCN 31847; \nBissaldi et al., GCN 31856), by Swift (GCN Caputo et al., GCN 31848). \nUsing publicly available data of GBM/Fermi we estimate the duration \nT_90 = 32.3 +/- 2.5 s in   (7 - 150) keV energy band. We performed \nspectral analysis in a time interval of (-1, 22) s since GBM trigger, \nthe best fit is obtained for Band model with following parameters: E_p = \n36.5 +/- 5.0 keV, alpha = -0.50 +/- 0.35, beta = -2.5 +/- 0.2. The \nfluence of F = (2.0 +/- 0.2)E-6 erg/cm**2 is obtained in 10 - 1000 keV \nenergy band. Using T_90,i - EH diagram [1,2] we can classify the burst \nas type II (long)  and find the minimal possible redshift value of z = \n0.03, which is excluding possible association with M51 galaxy and \nconfirming larger distance of GRB 220408A  (Zhu et., GCN 31864).\n\nThe T_90,i - EH diagram can be found in \nhttp://grb.rssi.ru/GRB220408A/GRB220408A_EHD.png\n\n[1] - Minaev et al., MNRAS, 492, 1919, 2020\n[2] - Minaev et al., Astronomy Letters, 46, 9, 573, 2020",
  "circularId": 31865,
  "createdOn": 1649519470000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 220408A: redshift lower limit estimating",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 220408A"
}