VLITE meter-wavelength detection of MAXI J1820+070 at 339 MHz
ATel #11540; E. Polisensky (NRL), S. Giacintucci (NRL), W. M. Peters (NRL), T. E. Clarke (NRL), N. E. Kassim (NRL)
on 17 Apr 2018; 16:47 UT
Credential Certification: Emil Polisensky (Emil.Polisensky@nrl.navy.mil)
Subjects: Radio, Infra-Red, Optical, X-ray, Binary, Black Hole, Transient
We report detection of MAXI J1820+070 (e.g. ATel #11399, #11418, #11420) at 339 MHz with the Very Large Array Low-band Ionosphere and Transient Experiment (VLITE, Clarke et al. 2016). The source was observed on April 12 for 53 minutes between 07:25 and 13:07 UTC, centered at MJD 58220.428. The fitted position is RA: 18:20:21.9, Dec = +07:11:07.2. It is unresolved by the VLITE beam with FWHM 5.74" × 3.46" at PA -52.6°. The flux density is 33.0 ± 5.3 mJy using the Perley & Butler (2017) flux scale; the uncertainty combines the image noise of 1.9 mJy and an assumed 15% flux scale uncertainty.
The meter-wavelength detection complements the higher-frequency radio detections (ATel #11533, #11439), and better constrains the broad-band radio continuum spectrum of this black hole candidate low-mass X-ray binary.
VLITE will continue to observe in tandem with any higher-frequency observations, and any additional measurements will be reported.
VLA Low-band Ionosphere and Transient Experiment
