VLA 10 GHz observation of AT2018gep (ZTF18abukavn)
ATel #12056; Anna Y. Q. Ho (Caltech), Daniel A. Perley (LJMU), Gregg Hallinan (Caltech), Jacob Jencson (Caltech), Alessandra Corsi (TTU), Shri Kulkarni (Caltech)
on 23 Sep 2018; 06:17 UT
Credential Certification: Anna Ho (ah@astro.caltech.edu)
Subjects: Radio, Supernovae, Transient
We observed the field of AT2018gep/ZTF18abukavn (ATel #12030) with the Very Large Array (VLA) on 2018-09-14 UT at a central frequency of 10 GHz. The VLA was in D-configuration and the on-source integration time was 30 minutes. Data was processed using the VLA CASA Calibration Pipeline and imaged using the CASA CLEAN function, using 3C286 as the flux calibrator and J1640+3946 as the gain calibrator.
We detect an unresolved source at the phase center. Fitting the source using CASA gives an integrated flux density of 91 +/- 4 uJy at RA=16:43:48.177, Dec=+41:02:42.97. With a synthesized beam major and minor FWHM of 12.4â and 9.6â respectively, this position is consistent with the position reported in ATel #12030. At z=0.033, the luminosity is 2E27 erg/s/Hz. We caution however that this flux density is also consistent with the expected radio luminosity of a star-forming galaxy, so we cannot rule out a host galaxy origin at this time.
We note that the FIRST catalog has a detection limit at this position of 0.94 mJy/beam, with a map RMS of 0.137 mJy/beam.
Further follow-up is planned, and we would like to thank the VLA staff for scheduling and carrying out these observations.