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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Arnold, DM; Steele, IA; Bates, SD; Mottram, CJ; Smith, RJ
Languages: English
Types: Unknown
Subjects: QB

Classified by OpenAIRE into

arxiv: Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics
GRB jets contain rapidly moving electrons which will spiral around magnetic field lines. This causes them to emit polarized synchrotron emission. We have built a series of polarimeters (RINGO and RINGO2) to investigate this by measuring the polarization of optical light from GRBs at a certain single wavelength. The instruments are mounted on the Liverpool Telescope, which is a fully robotic (i.e. unmanned) telescope on La Palma which reacts to triggers from satellites such as the NASA SWIFT mission. This has had great success, with the first ever detections of early time optical polarization being made. In addition, the first measurements of the change in optical polarization from a GRB as the jet expands have recently been obtained. In this paper we describe the design and construction of RINGO3. This will be a multi-colour instrument that can observe simultaneously at three wavelengths. By doing so we will be able to unambiguously identify where in the burst the polarized emission is coming from. This will allow us to distinguish between three possibilities: (1) Magnetic instabilities generated in the shock front, (2) Line of sight effects and (3) Large-scale magnetic fields present throughout the relativistic outflow. The instrument design combines a rapidly rotating polaroid, specially designed polarization insensitive dichroic mirrors and three electron multiplying CCD cameras to provide simultaneous wavelength coverage with a time resolution of 1 second.
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    • [1] Steele, I. A., Smith, R. J., Rees, P., Baker, I. P., Bates, S. D., Bode, M. F., Bowman, M. K., Carter, D., Etherton, J., Ford, M. J., Fraser, S. N., Gamboc, A., Lett, R. D. J., Mansfield, A. G., Marchant, J. M., Medrano-cerda, G. A., Mottram, C. J., Raback, D., Scott, A. B., Tomlinson, M. D., and Zamanov, R., “The liverpool telescope: performance and first results,” in [Ground-based and Airborne Instrumentation for Astronomy ], Oschmann, J. M., ed., Proc. SPIE 5489, 679-692 (2004).
    • [2] Guidorzi, C., Monfardini, A., Gamboc, A., Mundell, C. G., Steele, I. A., Carter, D., Bode, M. F., Smith, R. J., n. Fraser, S., Burgdorf, M. J., and m. Newsam, A., “The automatic real-time gamma-ray burst pipeline of the 2 m liverpool telescope,” PASP 118, 288-296 (2006).
    • [3] Steele, I. A., Bates, S. D., Guidorzi, C., Mottram, C. J., Mundell, C. G., and Smith, R. J., “Ringo: a nocel ring polarimeter for rapid grb followup,” in [Ground-based and Airborne Instrumentation for Astronomy ], Moorwood, A. F. M.; Iye, M., ed., Proc. SPIE 5492, 677-688 (2004).
    • [4] Steele, I. A., Bates, S. D., Guidorzi, C., Mottram, C. J., Mundell, C. G., and Smith, R. J., “Ringo2: an emccd-based polarimeter for grb followup,” in [Ground-based and Airborne Instrumentation for Astronomy III ], McLean, Ian S.; Ramsay, S. K. T. H., ed., Proc. SPIE 7735, 773549 (2010).
    • [5] Clarke, D. and Neumayer, D., “Experiments with a novel ccd stellar polarimeter,” A&A 383, 360-366 (2002).
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