English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The unusual multiwavelength lightcurves of GRB 101225A are revisited byassuming that it is from an off-axis GRB powered by a newborn magnetar. We showthat its optical afterglow lightcurve is fitted with the forward shock model byparameterizing its jet structure as a Gaussian function with a half openingangle of the jet core as $1.67^{\rm o}$. The derived initial Lorentz factor($\Gamma_0$) is 120, and the viewing angle to the jet axis is$\theta_v=3.7^{\rm o}$. Tentative QPO signatures of $P=488$ seconds and$P=250\sim 300$ seconds are found with a confidence level of 90\% by analysingits X-ray flares observed in the time interval of $[4900,\ 7500]$ seconds. Itsglobal gamma-ray/X-ray lightcurve and the QPO signatures are represented withthe magnetar dipole radiation (DR) model by considering the magnetar precessionmotion, assuming that the magnetar spindown is dominated by the GW emission.The bulk Lorentz factor of the DR ejecta is limited to 8, being much lower than$\Gamma_0$. Comparing GRB 101225A with the extremely off-axis GRB 170817A, wesuspect that the nature of the two-component jet in GRB 170817A is acombination of a co-axial GRB jet and a DR ejecta. GRB 101225A would be amongthe brightest ones of the CDF-S XT2 like X-ray transient population driven bynewborn magnetars. Discussion on detectability of its gravitational waveemission is also presented.

GRB 101225A as Orphan Dipole Radiation of a Newborn Magnetar with Precession Rotation in an Off-Axis Gamma-Ray Burst