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Fermi GBM Detects Pulsations from IGR J19294+1816

ATel #2985; Peter Jenke (MSFC/NPP), Ascension Camero-Arranz (FECYT/NSSTC), Mark H. Finger (USRA/MSFC), & Isabel Caballero (CEA, Saclay)
on 29 Oct 2010; 18:49 UT
Credential Certification: Dr. Mark H. Finger (Mark.Finger@msfc.nasa.gov)

Subjects: X-ray, Gamma Ray, Binary, Transient, Pulsar

Referred to by ATel #: 3917

X-ray flux pulsations are being detected by Fermi/GBM from the transient binary pulsar IGR J19294+1816, which was recently found by INTEGRAL to have renewed activity (ATel #2983). Pulsations near the period of 12.45 s were first detected in a daily blind search of the October 28 data. Weaker pulsations were also found in the October 27 data. IGR J19294+1816 was within the 90% confidence region of a source location determined from the October 28 data using the responses of the 12 GBM NaI detectors.

A 12-50 keV r.m.s. pulsed flux of 10 +/- 2 mCrab was measured for October 27.0-28.0, increasing to 17 +/- 2 mCrab for October 28.0-29.0. Using the data from October 27.0-29.0 we find a barycentric pulse frequency of 80.31114(24) mHz.

Corbet & Krimm (ATel #2008) found a 117 day orbital period from the times of previous outbursts. Their ephemeris predicts the peak flux will occur on Oct 31.7 +/- 1.5.

GBM Pulsar Project