Radio Disappearance of the Magnetar XTE J1810–197 and Continued X-Ray Timing
F. Camilo et al 2016 ApJ 820 110
The transient magnetar and 5.54-s radio pulsar XTE J1810−197 abruptly shut off in radio frequencies in 2008, but a high-amplitude thermal X-ray pulse remains, implying continuing magnetar activity.