We report barely visible detection of a radio burst (S/N = 5.1) from the recently discovered fast radio burst FRB20220912A (ATel #15679) in October 2022 daily archived data at 111 MHz with the Big Scanning Antenna (BSA) of the Pushchino Radio Astronomy Observatory. Observations were carried out with a 2.5 MHz bandwidth, ~415 kHz channel width and 100 ms sampling time. The coordinates used for the observations were RA (J2000): 23h09h05.49s +48d42m25.6s (J2000) (ATel #15693). Detection algorithm included convolution of observations with matched template (decaying exponent) of width 0.6 s (1/e) for improvement of signal-to-noise ratio (https://arxiv.org/abs/2109.11881).
Pulse broadening at DM=220 pc/cm^3 and bandwidth 415 kHz is 0.565 s. Width of the detected impulse convolved with template 1.49 s. After reduction for the broadening and template original pulse width estimate = 325 ms.
The burst was detected on October 18th 2022 at 18:48:15.53 UTC (Topocentric TOA at frequency 109.2 MHz) and had fluence 932 Jy ms. The fluence estimate takes into account the beam attenuation factor 0.28 due to detection on the side of the main diagram. The error margin for the fluence is about 15%.
Trial dispersion measure was from 0 to 1000 pc/cm^3 with step 20. The best fit DM obtained is 220 +/- 10 pc/cm^3.
FRB20220912A (2022/10/18)
Fig.1. Total pulse after convolution with matched template (decaying exponent).
Fig.2. Dynamical spectrum.
Fig.3. Amplitude of the burst vs. time and DM.
.png)
Fig.4. Amplitude of the burst (ADC units) vs. DM.
FRB20220912A (2022/10/30)
UTC = 2022.10.30 18h 0m 24.586s
Flux density = 0.354 Jy,
Fluence = 505 Jy ms,
Width observed = 1.426 s,
Pulse width = 132 ms.
Fig.1. Total pulse after convolution with matched template (decaying exponent).
Fig.2. Dynamical spectrum and amplitude of the burst vs. time and DM.
Fig.3. Amplitude of the burst (ADC units) vs. DM.