The X-ray afterglow flat segment in short GRB 051221A: Energy injection from a millisecond magnetar?
نویسندگان
چکیده
In GRB 051221A, an X-ray afterglow flat segment lasting ∼ 10 seconds represents the first clear case of strong energy injection in the external shock of a short GRB afterglow. In this work, we show that a millisecond pulsar with dipole magnetic field ∼ 10 Gauss could well account for that energy injection. The good quality X-ray flat segment thus suggests that the central engine of this short burst may be a millisecond magnetar.
منابع مشابه
Jet Breaks in Short Gamma-ray Bursts. Ii. the Collimated Afterglow of Grb 051221a
We report the best evidence to date of a jet break in a short gamma-ray burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221A. The combined X-ray light curve, which has three breaks, is similar to those commonly observed in Swift observations of long GRBs. A flat segment of the light curve at 0.1 days after the burst represents the first clear cas...
متن کاملJa n 20 07 A two component jet model for the X - ray afterglow flat segment in short GRB 051221 A
In the double neutron star merger or neutron star-black hole merger model for short GRBs, the outflow launched might be mildly magnetized and neutron rich. The magnetized neutron-rich outflow will be accelerated by the magnetic and thermal pressure and may form a two component jet finally, as suggested by Vlahakis, Peng & Königl (2003). We show in this work that such a two component jet model c...
متن کاملGrb 080503 Late Afterglow Re-brightening: Signature of a Magnetar-powered Merger-nova
GRB 080503 is a short gamma-ray burst (GRB) detected by Swift and has been classified as a GRB originating from a compact star merger. The soft extended emission and the simultaneous late re-brightening in both the X-ray and optical afterglow light curves raise interesting questions regarding its physical origin. We show that the broadband data of GRB 080503 can be well explained within the fra...
متن کاملThe Afterglow, Energetics and Host Galaxy of the Short-hard Gamma-ray Burst 051221a
We present detailed optical, X-ray and radio observations of the bright afterglow of the short gammaray burst 051221a obtained with Gemini, Swift/XRT, and the Very Large Array, as well as optical spectra from which we measure the redshift of the burst, z = 0.5464. At this redshift the isotropic-equivalent prompt energy release was about 1.5× 10 erg, and using the standard afterglow synchrotron ...
متن کاملGamma-ray Burst Afterglow with Continuous Energy Injection: Signature of a Highly-magnetized Millisecond Pulsar
We investigate the consequences of a continuously injecting central engine on the gamma-ray burst afterglow emission, focusing more specifically on a highly-magnetized millisecond pulsar engine. For initial pulsar parameters within a certain region of the parameter space, the afterglow lightcurves are predicted to show a distinctive achromatic bump feature, the onset and duration of which range...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006