A dataset provided by the European Space Agency

Proposal ID 1120030
Obs ID 11200300001, 11200300002
Title Hunting the claimed high energy cyclotron line of GRO J1008-57
Download Data Associated to the proposal https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:1120030
DOI https://doi.org/10.57780/esa-8j0zwlw
Author Kuhnel
Abstract We propose to monitor the recurrent neutron star transient GRO J1008-57 during the predicted outburstof the source with INTEGRAL-AO11 in 2014 January with one 50 ks observation per revolution, resulting ina total exposure time of 150 ks during 3 INTEGRAL revolutions. Several type I outbursts of GRO J1008-57have been observed in the past as ToOs by Swift, RXTE, and also Suzaku showing that the spectral shape remains constant between regular outbursts. No cyclotron absorption feature has been detected significantly in the spectrum. Since we were able to improve the orbital ephemeris (Khnel et al., ATEL #4564) it is now possible to predict the onset and maximum of future outbursts of the source to better than 5 days. The source underwent an irregular giant type II outburst in 2012 November (Nakajima et al., ATEL #4561; Krimm et al., #4573) during which a cyclotron absorption feature was claimed between 74 and 78 keV (Yamamoto et al., #ATEL 4759). We therefore propose to observe the system again after the giant outburst to confirm the claimed cyclotron line. In addition we will check on any changes of the spectral and temporal behavior during known type I outbursts.
Publications
Temporal Coverage 2014-01-01T09:30:03Z / 2014-01-07T22:54:12Z
Version 1.0
Mission Description The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact https://www.cosmos.esa.int/web/integral/helpdesk
Date Published 2025-03-25T09:54:37Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Kuhnel, 2025, 'Hunting the claimed high energy cyclotron line of GRO J1008-57', 1.0, European Space Agency, https://doi.org/10.57780/esa-8j0zwlw