Anomalous X-ray pulsar (AXP) 1E 1048.1-5937 was the first AXP ever observed to emit an SGR-like X-ray burst.
References
AXP 1E 1048-59 Wikipedia(Text) CC BY-SA
Anomalous X-ray pulsar (AXP) 1E 1048.1-5937 was the first AXP ever observed to emit an SGR-like X-ray burst.