A LOFAR high time resolution search for radio bursts from SGR 1935+2154

Beamformed signals from 24 LOFAR High-Band Antenna (HBA) stations were coherently dedispersed to a DM of 332.8 pc/cc to dynamic spectra with time resolutions of 0.655ms and 20ms. These were searched for bursts between DMs of 325 to 375 pc/cc with widths in the range of 0.65 to 900 ms. No bursts were seen down to a fluence of 37 Jy ms for a 20-ms burst at S/N~7 and 199 Jy ms for a 200-ms burst at S/N~12.

0.655ms data

high time resolution search

20ms data

low time resolution search

The millisecond pulsar PSR B1937+21 was also observed by placing a second tied-array beam towards it. Several dozen giant pulses were detected from it using the same analysis pipeline.

0.655ms data

high time resolution search