Probing the New Generation Geodetic Radio Telescopes for FRB Observations

Sergey L. Kurdubov, Dmitry A. Marshalov

Journal of Astronomical Instrumentation, Vol. 11, No. 03, 2250015 (2022)

DOI: 10.1142/S2251171722500155

Ключевые слова: Crab Nebula pulsar, searching technique, VGOS radio telescope

Аннотация

We investigate the possibility of fast radio burst (FRB) observation on new special geodetic 13m wideband radio telescopes in Very Large Base Interferometry (VLBI) and single-dish modes. The Crab Pulsar Giant Pulses (GPs) were used as a reference source of FRB. In order to verify our results we use joint simultaneous observations with 32m legacy and 13m new VLBI Global Observing System (VGOS) radio telescopes of the Quasar VLBI network in the L and S/X frequency bands. The special observation session contains two 10-min scans of Crab Pulsar. We successfully detect a total of 712 pulses with flux density >220Jy at 1653.5MHz on 32-m antenna and 262 pulses with flux density >315Jy at 2406.3MHz on 13-m antenna in Badary observatory. The VLBI fringes were obtained for approximately every third pulse. The energy distribution of detected pulses has a break in the power law fit at 3kJ⋅μs and α-values are −0.2 and −1.8 for lower and higher energies. A GP with a fluence of the order of 190kJy⋅μs in L-band was detected and 48kJy⋅μs in S-band. We found that the peak coincidence of right and left circular polarizations of dedispersed data on a single antenna can provide a maximum detection rate with fixed false probability. It was shown that the best GP detection rate on 13m VGOS radio telescope was achieved at Badary observatory with 13 pulses per minute in the S-band.