Fermi/GBM detects a new outburst from the transient Be/X-ray binary 2S 1553-54
ATel #14301; Peter Jenke (UAH), Colleen Wilson-Hodge (NASA-MSFC), Christian Malacaria (NASA-MSFC/USRA)
on 5 Jan 2021; 14:15 UT
Credential Certification: Peter Jenke (peter.a.jenke@nasa.gov)
Subjects: Gamma Ray, Binary, Neutron Star, Pulsar
The Fermi/GBM accreting pulsar program is currently detecting pulsations from the transient Be/X-ray binary 2S 1553-54. The outburst began on December 21 2020 with a RMS pulsed flux of 0.0639 +/- 0.009 keV cm^-2 s^-1 (12-25 keV) and continues to strengthen. The pulsed flux is currently at 0.187 +/- 0.009 keV cm^-2 s^-1 in the same energy band. The pulse profile is dominated by a single pulse over roughly half a phase in the 8 - 50 keV range. The pulse frequency as of January 2 is 107.69 +/- 0.00014 mHz. The last outburst of this source detected with Fermi/GBM occurred on 2014 February 4.
Frequency and pulsed history for 2S 1553-542
