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Large X-ray Burst from Anomalous X-ray Pulsar 4U 0142+61

ATEL # 993; F. P. Gavriil (NASA/GSFC), R. Dib, V. M. Kaspi (McGill U.), P. M. Woods (Dynetics)
on 8 Feb 2007; 2:35 UT
Password Certification: Victoria Kaspi (

Subjects: Radio, Infra-Red, Optical, X-ray, Request for Observations, Neutron Stars, Pulsars, Soft Gamma-ray Repeaters, Transients

At approximately 10:04:19 UTC on 7 February 2007 (MJD 54138.42), the Anomalous X-ray Pulsar 4U 0142+61 exhibited a large fast-rise X-ray burst, followed by a lengthy tail, during routine RXTE/PCA monitoring observations. On a 31-ms time scale, the count rate at the burst peak was approximately 3600 counts/s for 2 operational PCUs, in the 2-60 keV range, which corresponds roughly to a peak flux of ~4x10^-8 erg/s/cm^2. The burst was followed by an extended tail that lasted 20-30 mins upon which were superimposed, for approximately the first minute, bright single pulses at the nominal pulse period. Further details will be provided as available. Observations at all wavelengths, particularly optical, near and mid-infrared are encouraged.

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