Anomalous X-ray pulsar (AXP) 1E 1048.1-5937 was the first AXP ever observed to emit an SGR-like X-ray burst.
Anomalous X-ray pulsar (AXP) 1E 1048.1-5937 was the first instance of an AXP displaying characteristics akin to those of a Soft Gamma Repeater (SGR).