{
  "bibcode": "2022GCN.31739....1R",
  "body": "A. Rossi, E. Pian, F. Cusano, E. Maiorano, E. Palazzi (INAF-OAS) on \nbehalf of the CIBO collaboration, and S. Belkin (IKI, HSE) report :\n\nWe report the results of the spectroscopic follow-up observations of \nZTF22aabjpxh/AT2022cva, the afterglow of GRB 220219B (Ho et al., GCN \n31619; Kim�� et al., GCN 31628; Hu et al., GCN 31639; Belkin et al., GCNs \n31643, 31683; Pasham et al., GCN 31635; Beardmore et al., GCN 31644; \nTsvetkova et al., GCN 31646) at z=0.293 (Fremling et al., GCN 31629). \nThe optical spectra were obtained with the Multi-Object Double \nSpectrographs (MODS) instrument mounted on the 2x8.4-m LBT telescope \n(Mt. Graham, AZ, USA) at ~11 UT on 2021-03-07, ~16 days (i.e. ~12 \nrest-frame days) after the burst trigger. The spectra covers the \nwavelength range 3200-10000 AA, and we obtained a total of 6 exposures \nof 900s. The resulting spectrum has been corrected for Galactic \nextinction (A_V = 0.025 mag).\n\nThe slit was place in order to cover both the host galaxy and the GRB \nposition. In addition to the host spectra, a second trace is well \nvisible in the 2D image of the spectrum although superimposed to the one \nof the host galaxy. Its low S/N extracted spectrum shows features \nsimilar to those exhibited by XRF-associated SN2006aj at a similar phase \n(Mazzali et al. 2006, Nature, 442, 1018). This confirms the bump \nobserved by Belkin et al. (GCN 31736) as due to the emerging \ncontribution of the SN.\n\nWe acknowledge the excellent support from the LBTO, in particular B. \nRothberg and J. Williams, and from the LBT-INAF, particularly E. Marini \nin obtaining these observations.",
  "circularId": 31739,
  "createdOn": 1647009715000,
  "email": "andrea.rossi@inaf.it",
  "subject": "ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra",
  "submitter": "Andrea Rossi at INAF  <andrea.rossi@inaf.it>",
  "eventId": "ZTF22aabjpxh"
}