The Gamma ray Burst Monitor Accreting Pulsar Program has observed 4u 1626-67 in an apparent torque reversal
ATel #16011; Peter Jenke (UAH), Colleen Wilson-Hodge (NASA/MSFC), Christian Malacaria (ISSI)
on 26 Apr 2023; 00:09 UT
Credential Certification: Peter Jenke (peter.a.jenke@nasa.gov)
Subjects: Gamma Ray, Pulsar
The Gamma ray Burst Monitor Accreting Pulsar Program's frequency history of accreting pulsar 4u 1626-67 indicates a possible torque reversal occurring around 60020 MJD. The current (60057 MJD) frequency of the source is 130.4118 +/- 0.0005 mHz which is about the same frequency that was measured on 59967 MJD. Frequency measurements are not corrected for orbit. The 12-25 keV RMS pulsed flux has declined (~60%) since 59920 MJD and has become occasionally undetectable in the standard search pipeline in the last 40 days. The last torque reversal from 4u 1626-67 occurred 15 years ago (Camero-Arranz, et al 2010).
The GBM Accreting Pulsar Program
