Fermi/GBM detection of renewed activity from the transient Be/X-ray binary GRO J1750-27
ATel #14930; C. Malacaria (USRA), P. Jenke (UAH), C. Wilson-Hodge (NASA-MSFC)
on 21 Sep 2021; 16:08 UT
Credential Certification: Christian Malacaria (cmalacaria@usra.edu)
Subjects: X-ray, Neutron Star, Transient, Pulsar
Referred to by ATel #: 15241
We report on recent detections with Fermi/GBM of the transient Be/X-ray binary system GRO J1750-27.
GBM detected pulsations from the source starting on Sept. 18 (MJD 59475), when the source was detected with a spin frequency of 224.6784(43) mHz and with a pulsed flux in the 12-50 keV band of 0.086 +/- 0.013 erg/cm2/s.
The last GBM detection of this source was in Apr. 15, 2015 (MJD 57127), when the source was undergoing one of its rare outbursts and pulsations were detected at a maximum spin frequency of 224.7316(2) mHz.
The source thus shows spin-down during quiescence at a rate of about -2.6x10-10 mHz/s.
GBM will keep monitoring the source.
The GBM pulse history of this source can be found at:
https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/groj1750.html
We encourage further observations with X-ray observatories and multi-wavelength facilities.
