Fermi-GBM detection of the Be/X-ray Binary IGR J06074+2205

ATel #16307; C. Malacaria (ISSI), P. Jenke (UAH), C. A. Wilson-Hodge (NASA/MSFC)
on 23 Oct 2023; 14:49 UT
Credential Certification: Christian Malacaria (cmalacaria.astro@gmail.com)

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We report on recent detections with Fermi-GBM of the transient Be/X-ray binary system IGR J06074+2205, recently observed also by MAXI and INTEGRAL (ATel #15294, 16267). GBM detected pulsations from the source starting on October 3^rd, 2023 (MJD 60220), when the source was showing a spin frequency of 2.6700(2) mHz and with a pulsed flux in the 8-50 keV band of 0.196 +/- 0.025 keV/cm^-2/s.

This is the first GBM detection of this source. Over about 9 days the source shows spin-down to a spin frequency of 2.66922(8) mHz. Afterwards the source becomes undetected in GBM. The pulse profile is characterized by a double-peak shape with one main peak doubling the secondary peak intensity in the 8-50 keV band.

The GBM pulse history of this source can be found at:

https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/igrj06074.html

The GBM Accreting Pulsars Program webpage