1870006

Joint INTEGRAL and XMM-Newton observations of GRS 1915+105. We have been monitoring the black hole binary GRS 1915+105 since March 2019 in radio with the MeerKAT Interferometer (South Africa) and with the AMI-LA telescope (UK) as well in the X-rays with the All-Sky monitor Swift/BAT and MAXI on the ISS and with dedicated Swift/XRT observations. Since July 2019 GRS 1915+105 has been showing a varying behaviour displaying accretion states very rarely or never observed in the past ~30 years of its current outburst.After sampling a relatively soft (and obscured) state GRS 1915+105 went back to a harder state approximately 2 weeks ago. Very recently (September 30th) the MAXI/GSC light curve showed a sudden decrease in count rate accompanied by a decrease in radio emission. We triggered a dense Swift monitoring of the source and we started monitoring the target daily with AMI-LA in radio. The energy spectrum measured by XRT is a power law with photon index ~0.8 affected by heavy absorption with an equivalent N_H of ~3E+23/cm2. This spectral shape suggest obscuration and likely a high level of radiation reprocessing which will be probed in detail by INTEGRAL. In radio the target shows a low flux density (~3mJy) and very limited variability. The combination of heavily absorbed/reprocessed X-ray emission and low non-variable radio emission has not been observed in detailed so far. We have observed (1) low X-ray flux flux without local absorption + low flux radio emission (2) heavily absorbed X-ray emission and high flux density and variable radio emission (3) heavily absorbed (soft) X-ray emission and moderate (~10mJy) non variable radio emission. We hereby require to trigger joint XMM+INTEGRAL proposal 086496 (P.I.: Motta) to observe GRS 1915+105 transitioning to a new - likely radio quiet (only core jet emission) - obscured state. [truncated! Please see actual data for full text]