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GRB 011121: A Massive Star Progenitor

Price, P. A. and Berger, E. and Reichart, D. E. and Kulkarni, S. R. and Yost, S. A. and Frail, D. A. and Bloom, J. S. and Djorgovski, S. G. and Fox, D. W. and Galama, T. J. and Harrison, F. A. and Sari, R. (2002) GRB 011121: A Massive Star Progenitor. Astrophysical Journal Letters, 572 (1). L51-L55. ISSN 2041-8205. doi:10.1086/341552.

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Of the cosmological gamma-ray bursts, GRB 011121 has the lowest redshift, z = 0.36. More importantly, the multicolor excess in the afterglow detected in the Hubble Space Telescope (HST) light curves is compelling observational evidence of an underlying supernova. Here we present near-infrared and radio observations of the afterglow, and from our comprehensive afterglow modeling, we find evidence favoring a wind-fed circumburst medium. Lacking X-ray data, we are unable to conclusively measure the mass-loss rate, M, but obtain an estimate, M ~ 2 × 10^(-7)/vw_3 M☉ yr^(-1), where vw_3 is the speed of the wind from the progenitor in units of 10^3 km s^(-1). This M is similar to that inferred for the progenitor of the Type Ibc supernova SN 1998bw that has been associated with the peculiar burst GRB 980425. Our data, taken in conjunction with the HST results of Bloom et al., provide a consistent picture: the long-duration GRB 011121 had a massive star progenitor that exploded as a supernova at about the same time as the gamma-ray burst event. Finally, we note that the gamma-ray profile of GRB 011121 is similar to that of GRB 980425.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Berger, E.0000-0002-9392-9681
Reichart, D. E.0000-0002-5060-3673
Kulkarni, S. R.0000-0001-5390-8563
Bloom, J. S.0000-0002-7777-216X
Djorgovski, S. G.0000-0002-0603-3087
Fox, D. W.0000-0002-3714-672X
Harrison, F. A.0000-0003-2992-8024
Sari, R.0000-0002-1084-3656
Additional Information:© 2002 The American Astronomical Society. Received 2002 March 26; accepted 2002 May 2; published 2002 May 20. P. A. P. gratefully acknowledges an Alex Rodgers Traveling Scholarship. GRB research at Caltech (S. R. K., S. G. D., F. A. H., R. S.) is supported by grants from NSF and NASA. J. S. B. is a Fannie and Hertz Foundation Fellow. R. S. holds a holds a Senior Fairchild Fellowship. K. H. is grateful for Ulysses support under JPL contract 958056 and for IPN support under NASA grants FDNAG 5-11451 and NAG 5-10710. We thank R. Chevalier for useful discussion and E. Mazets, S. Golenetskii, and the Konus team for the use of the Konus data. Finally, we thank the staff of Las Campanas Observatory and the Australia Telescope National Facility for their assistance, and we applaud the heroic efforts of the staff of the AAT in obtaining these observations during the commissioning of IRIS2.
Funding AgencyGrant Number
Alex Rodgers Traveling ScholarshipUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
Sherman Fairchild FoundationUNSPECIFIED
NASANAG 5-10710
Subject Keywords:gamma rays: bursts
Issue or Number:1
Record Number:CaltechAUTHORS:20190918-083156797
Persistent URL:
Official Citation:P. A. Price et al 2002 ApJ 572 L51
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98709
Deposited By: Tony Diaz
Deposited On:18 Sep 2019 20:00
Last Modified:16 Nov 2021 17:41

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