GCN Circular 25571
Subject
LIGO/Virgo S190814bv: AT2019nqc and AT2019nqz 10.4m GTC spectroscopy
Event
Date
2019-08-30T10:44:26Z (6 years ago)
From
Alberto J. Castro-Tirado at IAA-CSIC <ajct@iaa.es>
O. Lopez-Cruz (INAOE), A. J. Castro-Tirado (IAA-CSIC), L. Macri
(TAMU),A. F. Valeev (SAO-RAS), E. Rios-Lopez (INAOE), Y.-D. Hu
(IAA-CSIC), M. Diaz (UTRGV), E. Fernandez-Garcia (IAA-CSIC), E. Troja
(UMD), A. Castellon (UMA), Chavushyan (INAOE), D. A. Kann
(HETH/IAA-CSIC) and J. Font Serra (GRANTECAN, IAC,ULL), on behalf of
three larger collaborations (including TOROS), report:
Following the detection of DG19qabkc/AT2019nqc and DG19ayfjc/AT2019nqz
(Andreoni et al., GCNC 25362) within the error area of the GW event
S190814bv (LVC, GCNC 25324), we obtained imaging and optical spectra
covering the range 3700-10000 A with the 10.4m GTC telescope equipped
with OSIRIS at La Palma (Spain), on Aug 19 and Aug 21.
DG19ayfjc/AT2019nqz is located closer than 0.5 arcsec to the center of
its host galaxy. On the stacked image with an exposure time of 3x10sec
we could not detected the transient itself. From the emission lines of
the host galaxy, a redshift z = 0.1076 +/- 0.0005 is measured, outside
the expected LVC redshift range. The slit also covered the transient
position, but no broad lines are detected.
DG19aqbkc/AT2019nqc spectroscopy reveals narrow galaxy lines at redshift
0.078 +/- 0.001. Cross-correlating the transient spectrum (broad lines)
with supernova template spectra in SNID (Blondin & Tonry, 2007), we find
a good match to the spectra of SNIIP at about week after maximum at same
redshift, about a week after maximum at the same redshift in agreement
with the result reported by Buckley et al. (GCNC 25481).
Therefore we consider both DG19qabkc/AT2019nqc and DG19ayfjc/AT2019nqz
to be unrelated to the GW event S190814bv.
[GCN OPS NOTE(31aug19): In the first sentence, "DG19aqbkc/AT2019nqc"
was changed to "DG19qabkc/AT2019nqc". In the last sentence,
"DG19aqbkc/AT2019nqc and DG19aqbkc/AT2019nqc" was changed to
"DG19qabkc/AT2019nqc and DG19ayfjc/AT2019nqz". We thank C. Balcon (ISSP)
for his comments.