Free Access
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
Page(s) 405 - 406
Published online 15 September 1999
DOI: 10.1051/aas:1999286

Astron. Astrophys. Suppl. Ser. 138, 405-406

Testing for synchrotron self-absorption in GRB 970111

A. Crider and E.P. Liang

Send offprint request: A. Crider

Department of Space Physics and Astronomy, 6100 S. Main, Rice University, Houston, TX 77005-1892, U.S.A.

Received December 18, 1998; accepted January 28, 1999


The time-resolved spectra of several gamma-ray bursts have shown that near the beginning of the burst, some absorption mechanism makes the spectra inconsistent with the simple optically-thin synchrotron shock model. We fit GRB 970111, which shows strong evidence for such absorption, with a synchrotron shock spectra suffering self-absorption. The synchrotron self-absorption shape does fit the BATSE time-evolving spectra, although it may be inconsistent with BeppoSAX WFC data. If the turnover just below the spectral break is due to synchrotron self-absorption, a magnetic field strength of $4 \ 10^7~{\rm G}$ is required.

Key words: gamma-rays: bursts -- gamma-rays: observations -- radiation mechanisms: non-thermal -- techniques: spectroscopic

Copyright The European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.