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Measuring the Accreting Stellar and Intermediate Mass Black Hole Populations in the Galaxy and Local Group
Jonathan Grindlay, Didier Barret, Tomaso Belloni +23
The population of stellar black holes (SBHs) in the Galaxy and galaxies generally is poorly known in both number and distribution. SBHs are the fossil record of the massive stars i…
Long-term Monitoring of Accreting Pulsars with Fermi GBM
Mark H. Finger, Elif Beklen, P. Narayana Bhat +9
Using the Gamma ray Burst Monitor (GBM) on Fermi we are monitoring accreting pulsar systems. We use the rates from GBM's 12 NaI detectors in the 8-50 keV range to detect and monito…
All-Sky Earth Occultation Observations with the Fermi Gamma Ray Burst Monitor
Colleen A. Wilson-Hodge, E. Beklen, P. N Bhat +10
Using the Gamma Ray Burst Monitor (GBM) on-board Fermi, we are monitoring the hard X-ray/soft gamma ray sky using the Earth occultation technique. Each time a source in our catalog…
Discovery of a New Torque Reversal of the Accreting X-ray Pulsar 4U 1626-67 by Fermi/GBM
A. Camero-Arranz, M. H. Finger, N. R. Ikhsanov +2
Recent X-ray observations by Fermi/GBM discovered a new torque reversal of 4U 1626-67 after 18 years of steady spinning down. Using Swift/BAT observations we were able to center th…
Magnetar Twists: Fermi/Gamma ray Burst Monitor (GBM) detection of SGR J1550-5418
Y. Kaneko, E. Gogus, C. Kouveliotou +12
SGR J1550-5418 (previously known as AXP 1E 1547.0-5408 or PSR J1550-5418) went into three active bursting episodes in 2008 October and in 2009 January and March, emitting hundreds…
Discovery of a new Soft Gamma Repeater: SGR J0418+5729
A. J. van der Horst, V. Connaughton, C. Kouveliotou +31
On 2009 June 5, the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-ray Space Telescope triggered on two short, and relatively dim bursts with spectral properties similar to…
Fermi Observations of GRB 090902B: A Distinct Spectral Component in the Prompt and Delayed Emission
GBM collaboration, LAT Collaboration, The Swift Team
We report on the observation of the bright, long gamma-ray burst, GRB 090902B, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on-board the Fermi ob…
Fermi observations of high-energy gamma-ray emission from GRB 080825C
LAT Collaboration
The Fermi Gamma-ray Space Telescope (FGST) has opened a new high-energy window in the study of Gamma-Ray Bursts (GRBs). Here we present a thorough analysis of GRB 080825C, which tr…
Spin-Down of the Long-Period Accreting Pulsar 4U 2206+54
Mark H. Finger, Nazar R. Ikhsanov, Colleen A. Wilson-Hodge +1
4U 2206+54 is a high mass X-ray binary which has been suspected to contain a neutron star accreting from the wind of its companion BD +53 2790. Reig et al. have recently detected 5…
The Fermi Gamma-Ray Burst Monitor
Charles Meegan, Giselher Lichti, P. N. Bhat +18
The Gamma-Ray Burst Monitor (GBM) will significantly augment the science return from the Fermi Observatory in the study of Gamma-Ray Bursts (GRBs). The primary objective of GBM is…
New Torque Reversal and Spin-Up of 4u 1626- 67 Observed by Fermi/GBM and Swift/BAT
A. Camero-Arranz, M. H. Finger, N. R. Ikhsanov +2
After about 18 years of steadily spinning down, the accretion-powered pulsar 4U 1626-67, experienced a torque reversal at the beginning of 2008. For the present study we have used…
The Dynamic X-ray Sky of the Local Universe
Alicia M. Soderberg, Jonathan E. Grindlay, Joshua S. Bloom +35
Over the next decade, we can expect time domain astronomy to flourish at optical and radio wavelengths. In parallel with these efforts, a dedicated transient "machine" operating at…
X-ray Timing of Neutron Stars, Astrophysical Probes of Extreme Physics
Z. Arzoumanian, S. Bogdanov, J. Cordes +11
The characteristic physical timescales near stellar-mass compact objects are measured in milliseconds. These timescales -- the free-fall time, the fastest stable orbital period, an…