NICER and NuSTAR observations of SGR 1935+2154 bracketing the time of the bright radio burst

Magnetar SGR 1935+2154, the only known Galactic emitter of fast radio bursts (FRB), entered a burst active state on 2022 October 10 (ATel #15667, GCN 32698, 32706, and 32708). We have continued our high-cadence monitoring campaign of the source with NICER (ATel #15674). We also performed ToO observations with NuSTAR starting from 2022-10-14 02:00 UTC with an exposure totalling 50 ks (NICER Proposal 5076). NuSTAR was observing SGR 1935+2154 during the radio burst which occurred on 2022-10-14 at 19:21:47 UTC as reported by the CHIME/FRB collaboration (ATel #15681). Unfortunately, at the arrival time of the burst, the source was Earth-occulted for NuSTAR. The closest on-target good time interval (GTI) ended approximately 12 minutes prior to the radio burst. During the NuSTAR observation, SGR 1935+2154 exhibited a high bursting rate, most notably during the two GTIs prior to the radio burst, starting at 2022-10-14 16:53 and ending on 2022-10-14 19:10. During the span of about 4 ks of livetime, we detect over a hundred bursts, sitting on a bed of enhanced baseline emission.