{
  "bibcode": "2020GCN.26764....1V",
  "body": "A. F. Valeev (SAO-RAS), Y.-D. Hu, A. J. Castro-Tirado and E. \nFernandez-Garcia (IAA-CSIC), V. Sokolov (SAO-RAS), I. Carrasco and A. \nCastellon (UMA), S. B. Pandey (ARIES) and N. Castro-Rodriguez \n(GRANTECAN, IAC, ULL), on behalf of a larger collaboration, report:\n\nFollowing the detection of AT2020vr/ZTF20aafdytz, \nAT2020vt/ZTF20aafemum,�� AT2020wa/ZTF20aafedbk, and AT2020wc/ZTF20aafeccu \n(Andreoni et al. GCNC 26741)�� within the error area of the GW event \nS200114f (LVC, GCNC 26734), we obtained optical spectra covering the \nrange 3700-7400 A with the 10.4m GTC telescope equipped with OSIRIS in \nLa Palma (Spain) starting on Jan 15, 00:01 UT.\n\nFor AT2020vr/ZTF20aafdytz, we measure r= 19.80 +/- 0.02 on Jan 15, 00:08 \nUT. The�� GTC spectrum is consistent with a SN Ia at about 6 days before \nmaximum at redshift z = 0.213 +/- 0.001, consistent with the redshift of \nthe host galaxy derived from the emission lines (z= 0.2132 +/- 0.0005).\n\nFor AT2020vt/ZTF20aafemum, we measure r = 21.49 +/- 0.07 on Jan 15, \n01:19 UT. The GTC spectrum is consistent with a SN Ia at about 7 days \nbefore maximum at redshift z = 0.255 +/- 0.009, consistent with the \nredshift of the host galaxy derived from the emission lines (z = 0.2528 \n+/- 0.0005).\n\nFor AT2020wa/ZTF20aafedbk, we measure r = 19.50 +/- 0.03 on Jan 15, \n02:00 UT. The GTC spectrum is consistent with a SN Ia at about 4 days \nbefore maximum at redshift z = 0.077 +/- 0.010, consistent with the \nredshift of the host galaxy derived from the emission lines (z = 0.0772 \n+/- 0.0005).\n\nFor AT2020wc/ZTF20aafeccu, we measure r = 18.69 +/- 0.02 on Jan 15, \n02:11 UT. The GTC spectrum is consistent with a SN Ia at about 10 days \nbefore maximum at redshift z = 0.107+/- 0.009, consistent with the \nredshift of the host galaxy derived from the emission lines (z = 0.0983 \n+/- 0.0005)\n\nTherefore we consider that AT2020vr/ZTF20aafdytz, AT2020vt/ZTF20aafemum, \nAT2020wa/ZTF20aafedbk and AT2020wc/ZTF20aafeccu are unrelated to the \nS200114f GW alert.\n\nThis message can be quoted.",
  "circularId": 26764,
  "createdOn": 1579080518000,
  "email": "ajct@iaa.es",
  "subject": "LIGO/Virgo S200114f: AT2020vr, AT2020vt, AT2020wa and AT2020wc 10.4m GTC spectroscopy",
  "submitter": "Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>",
  "eventId": "LIGO/Virgo S200114f"
}