A dataset provided by the European Space Agency

Name: Multiwavelength spectral variability of Very-High-Energy Blazar Outbursts detected by FACT
Published: 2025-03-25T09:54:38Z

Proposal ID	1240032
Obs ID	12400320001
Title	Multiwavelength spectral variability of Very-High-Energy Blazar Outbursts detected by FACT
Download Data Associated to the proposal	https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:1240032
DOI	https://doi.org/10.57780/esa-zvckakf
Author	Kreikenbohm
Abstract	We propose a 500 ks target of opportunity INTEGRAL observation of a blazar in outburst as detected by the new FACT TeV gamma-ray telescope blazar monitoring program, supplemented by pre-outburst snapshots and follow-up monitoring with Swift. Bright TeV gamma-ray flares have been detected frequently from blazars, such as Mrk 501 and Mrk 421, but complete, time-resolved information of the multiwavelength spectra covering the complete outburst are not available. Leptonic models for TeV flares predict simultaneous flux increases in the X-ray and in the gamma-ray band, while lepto-hadronic models show a complex variability pattern in these energy bands, depending on the dominant process responsible for the gamma-ray emission. Other types of TeV flares, which cannot be explained with current models, are also observed: orphan flares, which show variability in gamma-rays only, and flares with time lags between both bands. Most existing data sets of flaring behaviors lack detailed pre- and post-flare light curves and spectra, as well as continuous TeV monitoring.The here proposed observations 1) are triggered on bright gamma-ray flares, 2) yield simultaneous data in the optical/UV, X-ray, GeV- and very-high gamma-ray bands and 3) contain pre- and post-flare source state information. This type of ToO observations become feasible for the first time with the start of the FACT blazar monitoring program.
Publications	A comprehensive analysis of the hard X-ray spectra of bright Seyfert galaxies - Lubinski, P., Beckmann, V.,Gibaud, L.,Paltani, S.,Papadakis, I. E.,Ricci, C.,Soldi, S.,Turler, M.,Walter, R.,Zdziarski, A. A. (2016-05-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.458.2454L Extreme relativistic electron fluxes in the Earths outer radiation belt: Analysis of INTEGRAL IREM data - Meredith, Nigel P., Horne, Richard B.,Sandberg, Ingmar,Papadimitriou, Constantinos,Evans, Hugh D. R. (2017-07-01) http://ui.adsabs.harvard.edu/#abs/2017SpWea..15..917M Gamma-Ray Emission of ⁶⁰Fe and ²⁶Al Radioactivity in Our Galaxy - Wang, W., Siegert, T.,Dai, Z. G.,Diehl, R.,Greiner, J.,Heger, A.,Krause, M.,Lang, M.,Pleintinger, M. M. M.,Zhang, X. L. (2020-02-01) http://ui.adsabs.harvard.edu/#abs/2020ApJ...889..169W INTEGRAL/SPI {$gamma$}-ray line spectroscopy. Response and background characteristics - Diehl, Roland, Siegert, Thomas,Greiner, Jochen,Krause, Martin,Kretschmer, Karsten,Lang, Michael,Pleintinger, Moritz,Strong, Andrew W.,Weinberger, Christoph,Zhang, Xiaoling (2018-03-01) http://ui.adsabs.harvard.edu/#abs/2018A&A...611A..12D New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations - Krivonos, Roman A., Tsygankov, Sergey S.,Mereminskiy, Ilya A.,Lutovinov, Alexander A.,Sazonov, Sergey Yu.,Sunyaev, Rashid A. (2017-09-01) http://ui.adsabs.harvard.edu/#abs/2017MNRAS.470..512K The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR - Perez, Kerstin, Krivonos, Roman,Wik, Daniel R. (2019-10-01) http://ui.adsabs.harvard.edu/#abs/2019ApJ...884..153P The INTEGRAL/IBIS AGN catalogue: an update - Malizia, A., Landi, R.,Molina, M.,Bassani, L.,Bazzano, A.,Bird, A. J.,Ubertini, P. (2016-07-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.460...19M Water megamaser emission in hard X-ray selected AGN - Panessa, F., Castangia, P.,Malizia, A.,Bassani, L.,Tarchi, A.,Bazzano, A.,Ubertini, P. (2020-09-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...641A.162P X-ray absorption in INTEGRAL active galactic nuclei. Host galaxy inclination - Malizia, A., Bassani, L.,Stephen, J. B.,Bazzano, A.,Ubertini, P. (2020-07-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...639A...5M
Temporal Coverage	2015-12-18T10:59:36Z / 2015-12-20T11:14:58Z
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	2025-03-25T09:54:38Z
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Kreikenbohm, 2025, 'Multiwavelength spectral variability of Very-High-Energy Blazar Outbursts detected by FACT', 1.0, European Space Agency, https://doi.org/10.57780/esa-zvckakf