SIMBAD references

In 2019 April, radio observations of Proxima Centauri were performed with the Ultra-Wideband Low Receiver on the Parkes Telescope. A narrowband radio search of these data revealed a technosignature signal-of-interest reported as “blc1” at 982.002 MHz. After the initial discovery of blc1 in the data in 2020 October, we performed a series of reobservations over the next 6 months, totaling 39 hr of on-sky time. We do not redetect blc1, or find any other signals-of-interest, within ±1 MHz of 982.002 MHz in this data set. Taken in context, this null result implies that blc1 was transient radio frequency interference, makes it less consistent with a periodic transmission, and makes it less consistent with interstellar scintillation.