Constraints on the low frequency spectrum of FRB 121102

Understand

While repeating fast radio bursts (FRBs) remain scarce in number, they provide a unique opportunity for follow-up observations that enhance our knowledge of their sources and potentially of the FRB population as a whole.

• Attaining more burst spectra could lead to a better understanding of the origin of these bright, millisecond-duration radio pulses.
• We therefore performed $\sim$20 hr of simultaneous observations on FRB 121102 with the Effelsberg 100-m radio telescope and the Low Frequency Array (LOFAR) to constrain the spectral behaviour of bursts from FRB 121102 at 1.4 GHz and 150 MHz.
• This campaign resulted in the detection of nine new bursts at 1.4 GHz but no simultaneous detections with LOFAR.