Abstract
Data accumulated over the past year strongly favour the idea that γ-ray bursts lie at cosmological distances, although the nature of the power source remains unclear. Here we report radio observations of the supernova SN1998bw, which exploded at about the same time, and in about the same direction, as the γ-ray burst GRB980425. At its peak, the supernova was unusually luminous at radio wavelengths. A simple interpretation of the data requires that the source expanded with an apparent velocity of at least twice the speed of light, indicating that the supernova was accompanied by a shock wave moving at relativistic speeds (the ejects of supernovae are typically characterized by non-relativistic velocities). The energy of the shock is at least 1049 erg, with an inferred ejecta mass of 10−5 solar masses, and we suggest that the early phase of this shock wave produced the burst of γ-rays. Although in general the properties of supernovae are very different from those of γ-ray bursts, we argue that this unusual supernova establishes a second class of γ-ray burst, which is distinctly different from the cosmological kind.
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References
Metzger, M. R. Spectral constraints on the redshift of the optical counterpart to the γ-ray burst of 8 May 1997. Nature 387, 878–880 (1997).
Kulkarni, S. R. et al. Identification of a host galaxy at redshift z = 3.42 for the γ-ray burst of 14 December 1997. Nature 393, 35–39 (1998).
Boella, G. et al. BeppoSAX, the wide band mission for X-ray astronomy. Astron. Astrophys. Suppl. Ser. 122, 299–399 (1997).
Costa, E. et al. Discovery of an X-ray afterglow associated with the γ-ray burst of 28 February 1997. Nature 387, 783–785 (1997).
Van Paradijs, J. et al. Transient optical emission from the error box of the γ-ray burst of 28 February 1997. Nature 368, 686–688 (1997).
Frail, D. A., Kulkarni, S. R., Nicastro, L., Feroci, M. & Taylor, G. B. The radio afterglow from the γ-ray burst of 8 May 1997. Nature 389, 261–263 (1997).
Mészáros, P. & Rees, M. J. Optical and long-wavelength afterglow from gamma-ray bursts. Astrophys. J. 476, 232–237 (1997).
Vietri, M. The afterglow of gamma-ray bursts: the cases of GRB 970228 and GRB 970508. Astrophys. J. 488, L105–L108 (1997).
Waxman, E. Gamma-ray-burst afterglow: supporting the cosmological fireball model, constraining parameters, and making prediction. Astrophys. J. 485, L5–L8 (1997).
Fishman, G. J. & Meegan, C. A. Gamma-ray bursts. Annu. Rev. Astron. Astrophys. 33, 415–458 (1995).
Piran, T. in Unsolved Problems in Astrophysics (eds Bahcall, J. N. & Ostriker, J. P.) 343–377 (Princeton Univ. Press, (1997)).
Galama, T. J. et al. An unusual supernova in the error box of the γ-ray burst of 25 April 1998. Nature 395, 670–672 (1998).
Soffitta, P. et al. IAU Circ. No. 6884 (1998).
Wieringa, M. et al. IAU Circ. No. 6896 (1998).
Sadler, E. M., Stathakis, R. A., Boyle, B. J. & Ekers, R. D. IAU Circ. No. 6901 (1998).
Woosley, S. E., Eastman, R. G. & Schmidt, B. P. Gamma-ray bursts and Type Ic supernovae: SN 1998bw.Preprint astro-ph/9806299 available at 〈http://xxx.lanl.gov/abs/astro-ph/9806299〉 (1998).
Iwamoto, K. et al. Ahypernova model for the supernova associated with the γ-ray burst of 25 April 1998. Nature 395, 672–674 (1998).
Pian, E. et al. GCN Note. No. 61 (1998).
Pian, E., Frontera, F., Antonelli, L. A. & Piro, L. Wiering, M. GCN NoteNo. 69 (1998).
Wieringa, M., Frail, D. A., Kulkarni, S. R., Higdon, J. L. & Wark, R. GCN Note No. 63 (1998).
Galama, T. J. et al. GCN Note No. 62 (1998).
Bloom, J. S., Kulkarni, S. R., Djorgovski, S. G., McCarthy, P. & Frail, D. GCN Note No. 64 (1998).
Galama, T. J. et al. IAU Circ. No. 6895 (1998).
Lidman, C. et al. IAU Circ. No. 6895 (1998).
Tinney, C., Stathakis, R., Cannon, R. & Galama, T. IAU Circ. No. 6896 (1998).
Patat, F. & Piemonte, A. IAU Circ. No. 6918 (1998).
Miller, D. L. & Branch, D. Supernova absolute-magnitude distributions. Astron. J. 100, 530–539 (1990).
Hamuy, M. et al. IAU Circ. No. 5574 (1992).
Weiler, K. W. & Sramek, R. A. Supernovae and supernova-remnants. Rev. Astron. Astrophys. 26, 295–341 (1988).
Chevalier, R. A. Synchrotron self-absorption in radio supernovae. Astrohys. J. 499, 810–819 (1998).
Ball, L., Campbell-Wilson, D., Crawford, D. F. & Turtle, A. J. Radio observations of SN 1987A at 843 MHz. Astrophys. J. 453, 864–872 (1995).
van Dyk, S. D., Weiler, K. W., Sramek, R. A. & Panagia, N. SN 1988Z: the most distant radio supernova. Astrophys. J. 419, L69–L72 (1993).
Narayan, R. The physics of pulsar scintillation. Phil. Trans. R. Soc. Lond. A 341, 151–165 (1992).
Goodman, J. Radio scintillation of compact extra-galactic radio sources. Mon. Not. R. Astron. Soc. 294, 307–311 (1998).
Walker, M. A. Interstellar scintillation of compact extra-galactic radio sources. Mon. Not. R. Astron. Soc. 294, 307–311 (1998).
Chevalier, R. A. The radio and X-ray emission from type II supernovae. Astrophys. J. 259, 302–310 (1982).
Ball, L. & Kirk, J. G. The acceleration of electrons in the radio supernova SN 1986J. Astron. Astrophys. 303, L57–L60 (1995).
Shklovskii, I. S. Synchotron self-absorption of the radio emission of supernova 1983.51. Sov. Astron. Lett. 11, 105–106 (1985).
Slysh, V. I. Synchrotron self-absorption of radio emission from supernovae. Sov. Astron. Lett. 16, 339–342 (1990).
Scott, M. A. & Readhead, A. C. S. The low-frequency structure of powerful radio sources and limits to departures from equipartition. Mon. Not. R. Astron. Soc. 180, 539–550 (1977).
Hoyle, F., Burbidge, G. R. & Sargent, W. L. W. On the nature of the quasi-stellar sources. Nature 209, 751–753 (1966).
Kellerman, K. I. & Pauliny-Toth, I. I. K. The spectra of opaque radio sources. Astrophys. J. 155, L71–L78 (1968).
Readhead, A. C. S. Equipartition brightness temperature and the inverse Compton catastrophe. Astrophys. J. 426, 51–59 (1994).
Waxman, E. & Loeb, A. Asub-relativistic shock model for the radio emission of SN 1998bw.Preprint astro-ph/9808135 available at 〈http://xxx.lanl.gov/abs/astro-ph/9808135〉 (1998).
Conway, R. G. et al. The radio polarization of quasars. Mon. Not. R. Astron. Soc. 168, 137–162 (1974).
Hughes, P. A., Aller, H. D. & Aller, M. F. Synchrotron emission from shocked relativistic jets. I. The theory of radio-wavelengths variability and its relation to superluminal motion. Astrophys. J. 341, 54–67 (1989).
Hughes, P. A., Aller, H. D. & Aller, M. F. Synchrotron emission from shocked relativistic jets. I. A model for the centimeter wave band quiescent and burst emission from BL Lacertae. Astrophys. J. 341, 68–79 (1989).
Colgate, S. A. Early gamma rays from supernovae. Astrophys. J. 187, 333–335 (1974).
Ensman, L. & Burrows, A. Shock breakout in SN 1987A. Astrophys. J. 393, 742–755 (1992).
Bloom, J. S., Kulkarni, S. R., Harrison, F., Prince, T. & Frail, D. A. Expected characteristics of the subclass of supernova gamma-ray bursts. Astrophys. J. 506, L105–L108 (1998).
Norris, J. P., Bonnell, J. T. & Watanabe, K. Constraints on association of single-pulse gamma-ray bursts and supernovae.Preprint astro-ph/9807322 available at 〈http://xxx.lanl.gov/abs/astro-ph/9807322〉 (1998).
Acknowledgements
We thank L. Avery and G. Moriarty-Schieven for help in making the JCMT observations. D.A.F. and S.R.K. thank M. Rupen, M. Rees and B. Paczynski for discussions. S.R.K. thanks A. Readhead for extensive discussions of brightness temperature. The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The James Clerk Maxwell Telescope is operated by The Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research council of the United Kingdom, the Netherlands Organization for Scientific Research, and the National Research Council of Canada. The VLA is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The research of S.R.K. and E.S.P. is supported by the National Science Foundation and NASA.
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Kulkarni, S., Frail, D., Wieringa, M. et al. Radio emission from the unusual supernova 1998bw and its association with the γ-ray burst of 25 April 1998. Nature 395, 663–669 (1998). https://doi.org/10.1038/27139
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DOI: https://doi.org/10.1038/27139
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