Gamma-Ray Burst 980329 and its X-Ray Afterglow

Abstract

GRB 980329 is the brightest gamma-ray burst detected so far with the Wide Field Cameras aboard BeppoSAX, both in gamma-rays and X-rays. With respect to its fluence (2.6 X 10**-5 erg/s/cm**2 in 50 to 300 keV) it would be in the top 4% of gamma-ray bursts in the 4B catalog (Meegan et al. 1998). The time-averaged burst spectrum from 2 to 20 and 70 to 650 keV can be well described by the empirical model of Band et al. (1993). The resulting photon index above the break energy is exceptionally hard at -1.32 +/- 0.03. An X-ray afterglow was detected with the narrow-field instruments aboard BeppoSAX 7 h after the event within the error box as determined with the Wide Field Cameras. Its peak flux is (1.4 +/- 0.2) X 10**-12 erg/s/cm**2 (2 to 10 keV). The afterglow decayed according to a power law function with an index of -1.35 +/- 0.03. GRB 980329 is characterized by being bright and hard, and lacking strong spectral evolution.

arXiv comment13 pages with 3 figures. Accepted for publication in ApJ Lett

References in corpus (9)

• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• Shocked by GRB 970228: the afterglow of a cosmological fireball
• Gamma-Ray Burst Peak Duration as a Function of Energy
• BATSE Observations of Gamma-Ray Burst Spectra. IV. Time-Resolved High-Energy Spectroscopy
• The Discovery of the Radio Afterglow From the Optically Dim Gamma-Ray Burst of March 29, 1998
• X-ray Spectral Characteristics of Ginga Gamma-Ray Bursts
• In-flight performances of the BeppoSAX Gamma-Ray Burst Monitor

Cited by in corpus (29)

• Jets in GRBs
• A Study of the Afterglows of Four GRBs: Constraining the Explosion and Fireball Model
• High column densities and low extinctions of gamma-ray bursts: Evidence for hypernovae and dust destruction
• Prompt and delayed emission properties of Gamma-Ray Bursts observed with BeppoSAX
• A Standard Kinetic Energy Reservoir in Gamma-Ray Burst Afterglows
• On the energy of gamma-ray bursts
• BeppoSAX Observations of GRB980425: Detection of the Prompt Event and Monitoring of the Error Box
• Observations of GRB 990123 by the Compton Gamma-Ray Observatory
• On the role of extinction in failed gamma-ray burst optical/IR afterglows
• Gamma-Ray Burst afterglows as probes of environment and blastwave physics I: absorption by host galaxy gas and dust
• Gamma-Ray Burst Afterglows as Probes of Environment and Blastwave Physics II: the Distribution of p and Structure of the Circumburst Medium
• Evidence for a Molecular Cloud Origin for Gamma-Ray Bursts: Implications for the Nature of Star Formation in the Universe
• The Rapidly Fading Optical Afterglow of GRB 980519
• The BeppoSAX catalog of GRB X-ray afterglow observations
• Evidence for an Early High-Energy Afterglow Observed with BATSE from GRB980923
• Early X-ray Flares in GRBs
• The Broadband Afterglow of GRB980329
• Was GRB~980329 at z ~ 5?
• BeppoSAX confirmation of beamed afterglow emission from GRB990510
• Early GRB Afterglows from Relativistic Blast Waves in General Radiative Regimes
• The Use of Gamma-ray Bursts as Direction and Time Markers in SETI Strategies
• GRB990510: on the possibility of a beamed X-ray afterglow
• Redshift determination in the X-ray band of gamma-ray bursts
• A Late-Time Flattening of Afterglow Light Curves
• An HST study of three very faint GRB host galaxies
• Radiative Efficiencies of Continuously Powered Blast Waves
• The morphology of the X-ray afterglows and of the jetted GeV emission in long GRBs
• SCUBA sub-millimeter observations of gamma-ray bursters: II. GRB 991208, 991216, 000301C, 000630, 000911, 000926
• The dark burst 010214 with BeppoSAX: possible variable absorption and jet X-ray emission