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We report on the 2004 June 29 burst detected from the direction of theAnomalous X-ray Pulsar (AXP) 1E 1048.1-5937 using the Rossi X-ray TimingExplorer (RXTE). We find a simultaneous increase of ~3.5 times the quiescentvalue in the 2-10 keV pulsed flux of 1E 1048.1-5937 during the tail of theburst which identifies the AXP as the burst's origin. The burst was overallvery similar to the two others reported from the direction of this source in2001. The unambiguous identification of 1E 1048.1-5937 as the burster hereconfirms it was the origin of the 2001 bursts as well. The epoch of the burstpeak was very close to the arrival time of 1E 1048.1-5937's pulse peak. Theburst exhibited significant spectral evolution with the trend going from hardto soft. During the 11 days following the burst, the AXP was observed furtherwith RXTE, XMM-Newton and Chandra. Pre- and post-burst observations revealed nochange in the total flux or spectrum of the quiescent emission. Comparing allthree bursts detected thus far from this source we find that this event was themost fluent (>3.3x10^-8 erg/cm^2 in the 2-20 keV band), had the highest peakflux (59+/-9x10^-10 erg/s/cm^2 in the 2-20 keV band), and the longest duration(>699 s). The long duration of the burst differentiates it from Soft GammaRepeater (SGR) bursts which have typical durations of ~0.1 s. Bursts that occurpreferentially at pulse maximum, have fast-rises and long X-tails containingthe majority of the total burst energy have been seen uniquely from AXPs. Themarked differences between AXP and SGRs bursts may provide new clues to helpunderstand the physical differences between these objects.Comment: 24 pages, 4 figures, submitted to the Astrophysical Journa

A Burst and Simultaneous Short‐Term Pulsed Flux Enhancement from the Magnetar Candidate 1E 1048.1−5937