1120030

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. [truncated! Please see actual data for full text]