Decay of the GRB 990123 Optical Afterglow: Implications for the Fireball Model-Reference-Cited by-同舟云学术

Decay of the GRB 990123 Optical Afterglow: Implications for the Fireball Model

Published:1999-03-26 Issue:5410 Volume:283 Page:2069-2073
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Castro-Tirado Alberto J.¹²,Zapatero-Osorio Marı́a Rosa³,Caon Nicola³,Cairós Luz Marina³,Hjorth Jens⁴,Pedersen Holger⁴,Andersen Michael I.⁵,Gorosabel Javier²,Bartolini Corrado⁶,Guarnieri Adriano⁶,Piccioni Adalberto⁶,Frontera Filippo⁷⁸,Masetti Nicola⁸,Palazzi Eliana⁸,Pian Elena⁸,Greiner Jochen⁹,Hudec Renè¹⁰,Sagar Ram¹¹,Pandey Anil K.¹¹,Mohan Vinay¹¹,Yadav Ramakant K. S.¹¹,Nilakshi ¹¹,Björnsson Gunnlaugur¹²,Jakobsson Páll¹²,Burud Ingunn¹³,Courbin Frederic¹³,Valentini Gaetano¹⁴,Piersimoni Anna¹⁴,Aceituno Jesús¹⁵,Montoya Luz Marı́a¹⁵,Pedraz Santos¹⁵,Gredel Roland¹⁵,Claver Charles F.¹⁶,Rector Travis A.¹⁶,Rhoads James E.¹⁶,Walter Fabian¹⁷,Ott Jürgen¹⁸,Hippelein Hans¹⁹,Sánchez-Béjar Victor³,Gutiérrez Carlos³,Oscoz Alejandro³,Zhu Jin²⁰,Chen Jiansheng²⁰,Zhang Haotong²⁰,Wei Jianyan²⁰,Zhou Aiying²⁰,Guziy Sergei²¹,Shlyapnikov Aleksei²²,Heise John²³,Costa Enrico²⁴,Feroci Marco²⁴,Piro Luigi²⁴

Affiliation:

1. Instituto de Astrofı́sica de Andalucı́a, IAA-CSIC, Granada, Spain.

2. Laboratorio de Astrofı́sica Espacial y Fı́sica Fundamental, INTA, Madrid, Spain.

3. Instituto de Astrofı́sica de Canarias, La Laguna, Tenerife, Spain.

4. Astronomical Observatory, University of Copenhagen, Copenhagen, Denmark.

5. Nordic Optical Telescope, La Palma, Tenerife, Spain.

6. Dipartimento di Astronomia, Università di Bologna, Bologna, Italy.

7. Dipartimento di Fisica, Università di Ferrara, Ferrara, Italy.

8. Istituto Tecnologie e Studio Radiazioni Extraterrestri, CNR, Bologna, Italy.

9. Astrophysikalisches Institut, Potsdam, Germany.

10. Astronomical Institute, CZ-251 65 Ondrejov, Czech Republic.

11. U. P. State Observatory, Manora Park, Naini Tal, 263 129 India.

12. Science Institute, University of Iceland, Reykjavik, Iceland.

13. Institut d'Astrophysique et de Géophysique de Liège, Université de Liège, 4000 Liege, Belgium.

14. Osservatorio Astronomico “V. Cerulli,” Teramo, Italy.

15. Calar Alto Observatory, Almerı́a, Spain.

16. Kitt Peak National Observatory, Tucson AZ, 85726, USA.

17. Astronomical Observatory, University of Bonn, Germany.

18. Radioastronomisches Institut, 53121 Bonn, Germany.

19. Max-Plank Institut für Astronomie, Heidelberg, Germany.

20. Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, and Beijing Astrophysics Center, Beijing 100871, China.

21. Nikolaev University Observatory, Nikolskaya, 24, 327030 Nikolaev, Ukraine.

22. Nikolaev Space Research Group, Nikolaev Astronomical Observatory, 327030 Nikolaev, Ukraine.

23. Space Research Organization Netherlands, Utrecht, The Netherlands.

24. Istituto di Astrofisica Spaziale, CNR, Frascati, Italy.

Abstract

Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started ∼8.5 hours after the event and continued until 18 February 1999. When combined with other data, in particular from the Robotic Telescope and Transient Source Experiment (ROTSE) and the Hubble Space Telescope (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related to a cooling break passing the ultraviolet-optical band at about 1 day after the high-energy event. The steeper decline rate seen after 1.5 to 2 days may be evidence for a collimated jet pointing toward the observer.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference47 articles.

1. For an extensive review of GRB observations see

2. Fishman G. J., Meegan C. A., Annu. Rev. Astron. Astrophys. 33, 415 (1995).

3. Costa E., et al., Nature 387, 783 (1997);

4. Transient optical emission from the error box of the γ-ray burst of 28 February 1997

5. A. J. Castro-Tirado Astrophysics and Space Science in press preprint available at .

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