The 6.4 s X-ray pulsar 1E 1048.1–5937 was observed by BeppoSAX in 1997 May .
This source belongs to the class of “ anomalous ” pulsars which have pulse periods in range 5–11 s , show no evidence of optical or radio counterparts , and exhibit long-term increases in pulse period .
The phase-averaged 0.5–10 keV spectrum can be described by an absorbed power-law and blackbody model .
The best-fit photon index is 2.5 \pm 0.2 and the blackbody temperature and radius are 0.64 \pm 0.01 keV and 0.59 \pm 0.02 km ( for a distance of 3 kpc ) , respectively .
The detection of blackbody emission from this source strengthens the similarity with two of the more well studied “ anomalous ” pulsars , 1E 2259+586 and 4U 0142+614 .
There is no evidence for any phase dependent spectral changes .

The pulse period of 6.45026 \pm 0.00001 s implies that 1E 1048.1–5937 continues to spin-down , but at a slower rate than obtained from the previous measurements in 1994 and 1996 .