A sample of low energy bursts from FRB 121102

Understand

We present 41 bursts from the first repeating fast radio burst discovered (FRB 121102).

• A deep search has allowed us to probe unprecedentedly low burst energies during two consecutive observations (separated by one day) using the Arecibo telescope at 1.4 GHz.
• The bursts are generally detected in less than a third of the 580-MHz observing bandwidth, demonstrating that narrow-band FRB signals may be more common than previously thought.
• We show that the bursts are likely faint versions of previously reported multi-component bursts.