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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We report on observations of SGR 1900+14 made with the Rossi X-ray TimingExplorer (RXTE) and BeppoSAX during the April 2001 burst activation of thesource. Using these data, we measure the spindown torque on the star andconfirm earlier findings that the torque and burst activity are not directlycorrelated. We compare the X-ray pulse profile to the gamma-ray profile duringthe April 18 intermediate flare and show that (i) their shapes are similar and(ii) the gamma-ray profile aligns closely in phase with the X-ray pulsations.The good phase alignment of the gamma-ray and X-ray profiles suggests thatthere was no rapid spindown following this flare of the magnitude inferred forthe August 27 giant flare. We discuss how these observations further constrainmagnetic field reconfiguration models for the large flares of SGRs.Comment: 13 pages, 3 figures, accepted for publication in Ap

The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and Torque