FERMI GBM First to Detect a New Rare Outburst from an Accreting Pulsar System

The Fermi Gamma-ray Burst Monitor (GBM) was the first instrument to detect a rare outburst from the accreting pulsar system GRO J1750-27. This system has had only three known outbursts including its discovery in 1995. The new outburst began on 9/18/21 and was reported to the community via an Astronomer’s telegram by Christian Malacaria (USRA), Peter Jenke (UAH), and Colleen Wilson-Hodge (ST12). The GBM observations have led to a new Director’s Discretionary Time (DDT) observation, led by Malacaria, with the Nuclear Spectroscopic Telescope Array (NuSTAR) hard X-ray telescope. This will be the first observation of GRO J1750-27 with NuSTAR. Observations with the Neutron star Interior Composition Explorer (NICER) have also been proposed. Fermi GBM will continue to monitor the pulsar’s spin period, currently about 4.4 s, and the intensity of the pulsed signal for more in-depth analysis.

FERMI GBM
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