Five Years of Multi-frequency Monitoring of GRB030329 Afterglow Using the GMRT and WSRT

Journal Article · Mon May 25 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3155871· OSTI ID:21304937

Kamble, Atish; Wijers, Ralph; Rol, Evert ^[1]; Horst, A J. van der; Kouveliotou, Chryssa ^[2]; Bhattacharya, D ^[3]; Chandra, C H. Ishwara ^[4]; Resmi, L ^[5]; Strom, R ^[6]

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1. Astronomical Institute 'Anton Pannekoek', Kruislaan 403, 1098 SJ Amsterdam (Netherlands)
2. National Space Science and Technology Center, 320 Sparkman Drive, Huntsville, AL 35805 (United States)
3. Inter University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune: 411 007 (India)
4. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune University Campus, Pune: 411 007 (India)
5. GRECO, Institut d'Astrophysique de Paris, 98bis, bd Arago-75014, Paris (France)
6. ASTRON, P.O. Box 2, 7990 AA Dwingeloo (Netherlands)

GRB 030329 displayed one of the brightest optical afterglows ever. We have followed the radio afterglow of GRB 030329 for over 5 years using the GMRT and WSRT at low radio frequencies. This is the longest as well as the lowest frequency follow up of any GRB afterglow ever.Radio observations of a GRB afterglow provide a unique probe of the physics of the blast wave at late times, when the expansion of the fireball slows down to non-relativistic speeds. Our GMRT-WSRT observations suggest that the afterglow of GRB030329 entered the non-relativistic phase around 60 days after the burst. The estimate of the fireball energy content, {approx}10{sup 51} erg, in this near-isotropic phase is much less susceptible to the collimation-related uncertainties arising in the relativistic phase. We have also been closely monitoring the evolution of the afterglow to look for possible signatures of emission from a counter jet, but no conclusive evidence has so far been found.

• OSTI ID: 21304937
• Journal Information: AIP Conference Proceedings, Vol. 1133, Issue 1; Conference: 6. Huntsville symposium on gamma-ray burst, Huntsville, AL (United States), 20-23 Oct 2008; Other Information: DOI: 10.1063/1.3155871; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
AFTERGLOW
COSMIC GAMMA BURSTS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
GAMMA ASTRONOMY
GAMMA DETECTION
PHOTON EMISSION
PROBES
TELESCOPE COUNTERS
VELOCITY