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Title:
A Tale of Two Faint Bursts: GRB 050223 and GRB 050911
Authors:
Page, K. L.; Barthelmy, S. D.; Beardmore, A. P.; Burrows, D. N.; Campana, S.; Chincharini, G.; Cummings, J. R.; Cusumano, G.; Gehrels, N.; Giommi, P.; Goad, M. R.; Godet, O.; Graham, J.; Kaneko, Y.; Kennea, J. A.; Mangano, V.; Markwardt, C. B.; O'Brien, P. T.; Osborne, J. P.; Reichart, D. E.; Rol, E.; Sakamoto, T.; Tagliaferri, G.; Tanvir, N. R.; Wells, A. A.; Zhang, B.
Affiliation:
AA(Department of Physics and Astronomy, University of Leicester, UK), AB(NASA/GSFC, Greenbelt, MD 20771), AC(Department of Physics and Astronomy, University of Leicester, UK), AD(Department of Astronomy & Astrophysics, PSU, University Park PA 16802), AE(INAF - Osservatorio Astronomico di Brera, 23807 Merate (LC), Italy), AF(INAF - Osservatorio Astronomico di Brera, 23807 Merate (LC), Italy), AG(NASA/GSFC, Greenbelt, MD 20771), AH(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, 90146 Palermo, Italy), AI(NASA/GSFC, Greenbelt, MD 20771), AJ(ASI Science Data Center, 00044 Frascati, Italy), AK(Department of Physics and Astronomy, University of Leicester, UK), AL(Department of Physics and Astronomy, University of Leicester, UK), AM(STScI, Baltimore, MD 21218), AN(University of Alabama, NSSTC, Huntsville, AL 35805), AO(Department of Astronomy & Astrophysics, PSU, University Park PA 16802), AP(INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Sezione di Palermo, 90146 Palermo, Italy), AQ(NASA/GSFC, Greenbelt, MD 20771), AR(Department of Physics and Astronomy, University of Leicester, UK), AS(Department of Physics and Astronomy, University of Leicester, UK), AT(Department of Physics and Astronomy, University of North Carolina at Chapel Hill, NC 27599), AU(Department of Physics and Astronomy, University of Leicester, UK), AV(NASA/GSFC, Greenbelt, MD 20771), AW(INAF - Osservatorio Astronomico di Brera, 23807 Merate (LC), Italy), AX(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, AL10 9AB, UK), AY(Department of Physics and Astronomy, University of Leicester, UK), AZ(University of Nevada, Las Vegas, NV 89154-4002)
Publication:
GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 321-324 (2006). (AIPC Homepage)
Publication Date:
05/2006
Origin:
AIP
Keywords:
gamma-ray sources (astronomical), X-ray sources (astronomical), afterglows
DOI:
10.1063/1.2207912
Bibliographic Code:
2006AIPC..836..321P

Abstract

GRBs 050223 and 050911 were discovered by the Swift Burst Alert Telescope (BAT) on 23rd February and 11th September 2005 respectively. The observation of GRB 050223 showed a faint, fading X-ray source, which was identified as the afterglow; GRB 050911, however, was not detected, making any X-ray afterglow extremely faint. The faintness of the afterglow of GRB 050223 could be explained by a large opening or viewing angle, or by the burst being at high redshift. The non-detection of GRB 050911 may indicate the burst occurred in a low-density environment, or, alternatively, was due to a compact object merger, in spite of the apparent long duration of the burst.
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