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RTT150 telescope: GRB 030329 русский

Observations of GRB afterglows with Russian-Turkish 1.5-m Telescope (RTT150)

GRB 030329

GCN Circ.: 2001, 2024, 2046, 2051, 2054, 2079, 2094, 2105, 2108, 2119, 2198, 2204, 2220, 2260, 2299
RTT150 was one of the first 1.5m-class telescopes pointed to the afterglow. Observations were started approximately 6 hours after the burst. During the first 5 hours of our observations the afterglow faded exactly as a power law with index -1.19+-0.01 in each of the BVRI Bessel filters. After that, in all BVRI filters simultaneously we observe a steepening of the power law light curve. The power law decay index smoothly approaches the value &approx -1.9, observed by other observatories later. This power law break occurs at t-t_0 ≈ 0.57 days and lasts for ≈ 0.1 days. We observe no variability above the gradual fading with the upper limits 10-1% on time scales 0.1-1000s. Spectral flux distribution in four BVRI filters corresponds to the power law spectrum with spectral index α = 0.66 +- 0.01. The change of the power law decay index in the end of our observations can be interpreted as a signature of collimated ultrarelativistic jet. The afterglow flux distribution in radio, optical and x-rays is consistent with synchrotron spectrum.

The observations were continued untill approximately 100 days after the bursts. A significant amount of these data are still unpublished or published only after preliminary analysys in GCN circulars.

RTT150 first night data table (from Burenin et al., 2003)

Publications:

Burenin et al., Astronomy Letters, 29, 573 (2003), astro-ph/0306137, The original text in Russian
see also: Urata et al., The Astrophysical Journal, 601, 17, astro-ph/0312145

       

       

       

       

       

   

Observations of GRB afterglows with Russian-Turkish 1.5-m Telescope (RTT150)

High Energy Astrophysics Department
Space Research Institute of Russian Academy of Sciences (IKI)