{
  "bibcode": "2017GCN.20902....1T",
  "body": "L. Tomasella, E. Cappellaro, S. Benetti (INAF OAPd), D. Malesani \n(DARK/NBI, Denmark), G. Greco (Urbino University/INFN Firenze), A. \nRossi, E. Palazzi (INAF-IASF Bo), M. Branchesi (Urbino University/INFN \nFirenze), L. Amati (INAF-IASF Bo), L. A. Antonelli, S. Ascenzi \n(INAF-OAR), M.T. Botticella (INAF-OAC), S. Campana, S. Covino, P. \nD'Avanzo (INAF-OAB), V. D'Elia (INAF-ASDC), F. Getman, A. Grado, L. \nLimatola (INAF-OAC), M. Lisi (INAF-OAR), A. Melandri (INAF-OAB), L. \nNicastro (INAF-IASF Bo), E. Pian (SNS-Pisa), S. Piranomonte, L. Pulone \n(INAF-OAR), G. Stratta (Urbino University/INFN Firenze), G. Tagliaferri \n(INAF-OAB), V. Testa (INAF-OAR), S. Yang (INAF-OAPD), E. Brocato \n(INAF-OAR) on behalf of GRAvitational Wave Inaf TeAm (GRAWITA) report:\n\nWe report spectroscopic observations of the ATLAS transients ATLAS17byo \nand ATLAS17cgg (Smartt et al., LVC Circ. 20881), discovered in the \nskymap (cWB_plus_LIB.fits) of G277583 (LVC Circ. 20860), with event time \n2017-03-13 22:40:09.593 UT (MJD 57825.945).\n\nThe observations were performed with the Asiago 1.82 m Copernico \nTelescope equipped with AFOSC (range 340-820 nm; resolution 1.4 nm).\n\nName        RA           DEC        z      Host Galaxy\nATLAS17byo  16:33:19.87 +23:43:52.4 0.033  SDSS J163319.94+234356.4\nATLAS17cgg  08:03:55.23 +26:31:12.3 0.0217 IC 0491\n\n1) ATLAS17byo was observed at MJD=57830.05 under bad sky conditions. \nHowever, the noisy spectrum shows that this transient is a normal type \nIa SN, around maximum light.\n\n2) ATLAS17cgg was observed starting from MJD=57829.88. We took 3 spectra \nshowing that this transient is a young type IIn SN. The spectra display \na blue continuum with over-imposed Balmer emission lines with composite \nprofiles (FWHM ~ 1300-1700 km/s). The best match is found with SN 1998S \n(Fassia et al. 2000 MNRAS 318) before maximum. Multiband photometry was \nalso collected and a preliminary analysis shows that: u = 17.66[0.014], \ng = 17.12[0.016] AB mag; B = 17.20[0.014], V = 17.13[0.018] Vega mag\n\nOur spectral classifications are consistent with those provided by \nBlagorodnova et al. (LVC Circ. 20897).",
  "circularId": 20902,
  "createdOn": 1489831288000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "LIGO/Virgo G277583: Asiago spectroscopic classification of ATLAS17byo and ATLAS17cgg",
  "submitter": "Daniele Malesani at DARK/NBI  <malesani@dark-cosmology.dk>",
  "eventId": "LIGO/Virgo G277583"
}