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FRB 20220912A is a repeating Fast Radio Burst (FRB) that was discovered inFall 2022 and remained highly active for several months. We report thedetection of 35 FRBs from 541 hours of follow-up observations of this sourceusing the recently refurbished Allen Telescope Array, covering 1344 MHz ofbandwidth primarily centered at 1572 MHz. All 35 FRBs were detected in thelower half of the band with non-detections in the upper half and coveredfluences from 4-431 Jy-ms (median$=$48.27 Jy-ms). We find consistency withprevious repeater studies for a range of spectrotemporal features including:bursts with downward frequency drifting over time; a positive correlationbetween bandwidth and center frequency; and a decrease in sub-burst durationover time. We report an apparent decrease in the center frequency of observedbursts over the 2 months of the observing campaign (corresponding to a drop of$6.21\pm 0.76$ MHz per day). We predict a cut-off fluence for FRB 20220912A of$F_\textrm{max}\lesssim 10^4$ Jy-ms, for this source to be consistent with theall-sky rate, and find that FRB 20220912A significantly contributed to theall-sky FRB rate at a level of a few percent for fluences of $\sim$100 Jy-ms.Finally, we investigate characteristic timescales and sub-burst periodicitiesand find a) a median inter-subburst timescale of 5.82$\pm$1.16 ms in themulti-component bursts and b) no evidence of strict periodicity even in themost evenly-spaced multi-component burst in the sample. Our results demonstratethe importance of wideband observations of FRBs, and provide an important setof observational parameters against which to compare FRB progenitor andemission mechanism models.

Characterization of the Repeating FRB 20220912A with the Allen Telescope Array