GRB 090902B

Afterglow observations and implications

S. B. Pandey, C. A. Swenson, D. A. Perley, C. Guidorzi, K. Wiersema, D. Malesani, C. Akerlof, M. C.B. Ashley, D. Bersier, Z. Cano, A. Gomboc, I. Ilyin, P. Jakobsson, I. K.W. Kleiser, S. Kobayashi, C. Kouveliotou, A. J. Levan, T. A. McKay, A. Melandri, C. J. Mottram & 13 others C. G. Mundell, P. T. O'Brien, A. Phillips, J. M. Rex, M. H. Siegel, R. J. Smith, I. A. Steele, G. Stratta, N. R. Tanvir, D. Weights, S. A. Yost, F. Yuan, W. Zheng

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The optical-infrared afterglow of the Large Area Telescope (LAT)-detected long-duration burst, GRB 090902B, has been observed by several instruments. The earliest detection by ROTSE-IIIa occurred 80 minutes after detection by the Gamma-ray Burst Monitor instrument on board the Fermi Gamma-Ray Space Telescope, revealing a bright afterglow and a decay slope suggestive of a reverse shock origin. Subsequent optical-IR observations followed the light curve for 6.5 days. The temporal and spectral behavior at optical-infrared frequencies is consistent with synchrotron fireball model predictions; the cooling break lies between optical and XRT frequencies 1.9 days after the burst. The inferred electron energy index is p = 1.8 ± 0.2, which would however imply an X-ray decay slope flatter than observed. The XRT and LAT data have similar spectral indices and the observed steeper value of the LAT temporal index is marginally consistent with the predicted temporal decay in the radiative regime of the forward shock model. Absence of a jet break during the first 6 days implies a collimation-corrected γ-ray energy E γ > 2.2 × 1052 erg, one of the highest ever seen in a long-duration gamma-ray bursts. More events combiningGeV photon emission with multiwavelength observations will be required to constrain the nature of the central engine powering these energetic explosions and to explore the correlations between energetic quanta and afterglow emission.

Original languageEnglish
Pages (from-to)799-804
Number of pages6
JournalAstrophysical Journal
Volume714
Issue number1
DOIs
Publication statusPublished - 1 Apr 2010

Fingerprint

afterglows
telescopes
gamma ray bursts
bursts
decay
energetics
shock
slopes
Fermi Gamma-ray Space Telescope
fireballs
collimation
erg
light curve
energy
engines
explosions
monitors
explosion
engine
synchrotrons

Keywords

  • Gamma-ray burst: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pandey, S. B., Swenson, C. A., Perley, D. A., Guidorzi, C., Wiersema, K., Malesani, D., ... Zheng, W. (2010). GRB 090902B: Afterglow observations and implications. Astrophysical Journal, 714(1), 799-804. https://doi.org/10.1088/0004-637X/714/1/799

GRB 090902B : Afterglow observations and implications. / Pandey, S. B.; Swenson, C. A.; Perley, D. A.; Guidorzi, C.; Wiersema, K.; Malesani, D.; Akerlof, C.; Ashley, M. C.B.; Bersier, D.; Cano, Z.; Gomboc, A.; Ilyin, I.; Jakobsson, P.; Kleiser, I. K.W.; Kobayashi, S.; Kouveliotou, C.; Levan, A. J.; McKay, T. A.; Melandri, A.; Mottram, C. J.; Mundell, C. G.; O'Brien, P. T.; Phillips, A.; Rex, J. M.; Siegel, M. H.; Smith, R. J.; Steele, I. A.; Stratta, G.; Tanvir, N. R.; Weights, D.; Yost, S. A.; Yuan, F.; Zheng, W.

In: Astrophysical Journal, Vol. 714, No. 1, 01.04.2010, p. 799-804.

Research output: Contribution to journalArticle

Pandey, SB, Swenson, CA, Perley, DA, Guidorzi, C, Wiersema, K, Malesani, D, Akerlof, C, Ashley, MCB, Bersier, D, Cano, Z, Gomboc, A, Ilyin, I, Jakobsson, P, Kleiser, IKW, Kobayashi, S, Kouveliotou, C, Levan, AJ, McKay, TA, Melandri, A, Mottram, CJ, Mundell, CG, O'Brien, PT, Phillips, A, Rex, JM, Siegel, MH, Smith, RJ, Steele, IA, Stratta, G, Tanvir, NR, Weights, D, Yost, SA, Yuan, F & Zheng, W 2010, 'GRB 090902B: Afterglow observations and implications', Astrophysical Journal, vol. 714, no. 1, pp. 799-804. https://doi.org/10.1088/0004-637X/714/1/799
Pandey SB, Swenson CA, Perley DA, Guidorzi C, Wiersema K, Malesani D et al. GRB 090902B: Afterglow observations and implications. Astrophysical Journal. 2010 Apr 1;714(1):799-804. https://doi.org/10.1088/0004-637X/714/1/799
Pandey, S. B. ; Swenson, C. A. ; Perley, D. A. ; Guidorzi, C. ; Wiersema, K. ; Malesani, D. ; Akerlof, C. ; Ashley, M. C.B. ; Bersier, D. ; Cano, Z. ; Gomboc, A. ; Ilyin, I. ; Jakobsson, P. ; Kleiser, I. K.W. ; Kobayashi, S. ; Kouveliotou, C. ; Levan, A. J. ; McKay, T. A. ; Melandri, A. ; Mottram, C. J. ; Mundell, C. G. ; O'Brien, P. T. ; Phillips, A. ; Rex, J. M. ; Siegel, M. H. ; Smith, R. J. ; Steele, I. A. ; Stratta, G. ; Tanvir, N. R. ; Weights, D. ; Yost, S. A. ; Yuan, F. ; Zheng, W. / GRB 090902B : Afterglow observations and implications. In: Astrophysical Journal. 2010 ; Vol. 714, No. 1. pp. 799-804.
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T2 - Afterglow observations and implications

AU - Pandey, S. B.

AU - Swenson, C. A.

AU - Perley, D. A.

AU - Guidorzi, C.

AU - Wiersema, K.

AU - Malesani, D.

AU - Akerlof, C.

AU - Ashley, M. C.B.

AU - Bersier, D.

AU - Cano, Z.

AU - Gomboc, A.

AU - Ilyin, I.

AU - Jakobsson, P.

AU - Kleiser, I. K.W.

AU - Kobayashi, S.

AU - Kouveliotou, C.

AU - Levan, A. J.

AU - McKay, T. A.

AU - Melandri, A.

AU - Mottram, C. J.

AU - Mundell, C. G.

AU - O'Brien, P. T.

AU - Phillips, A.

AU - Rex, J. M.

AU - Siegel, M. H.

AU - Smith, R. J.

AU - Steele, I. A.

AU - Stratta, G.

AU - Tanvir, N. R.

AU - Weights, D.

AU - Yost, S. A.

AU - Yuan, F.

AU - Zheng, W.

PY - 2010/4/1

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N2 - The optical-infrared afterglow of the Large Area Telescope (LAT)-detected long-duration burst, GRB 090902B, has been observed by several instruments. The earliest detection by ROTSE-IIIa occurred 80 minutes after detection by the Gamma-ray Burst Monitor instrument on board the Fermi Gamma-Ray Space Telescope, revealing a bright afterglow and a decay slope suggestive of a reverse shock origin. Subsequent optical-IR observations followed the light curve for 6.5 days. The temporal and spectral behavior at optical-infrared frequencies is consistent with synchrotron fireball model predictions; the cooling break lies between optical and XRT frequencies 1.9 days after the burst. The inferred electron energy index is p = 1.8 ± 0.2, which would however imply an X-ray decay slope flatter than observed. The XRT and LAT data have similar spectral indices and the observed steeper value of the LAT temporal index is marginally consistent with the predicted temporal decay in the radiative regime of the forward shock model. Absence of a jet break during the first 6 days implies a collimation-corrected γ-ray energy E γ > 2.2 × 1052 erg, one of the highest ever seen in a long-duration gamma-ray bursts. More events combiningGeV photon emission with multiwavelength observations will be required to constrain the nature of the central engine powering these energetic explosions and to explore the correlations between energetic quanta and afterglow emission.

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