MAXI and RXTE-ASM detect superburst candidate for 4U 1820-30

Details MAXI and RXTE-ASM detect superburst candidate for 4U 1820-30 MAXI and RXTE-ASM detect superburst candidate for 4U 1820-30

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3625....1i&link_type=abstract

The Astronomer's Telegram, #3625

Astronomy and Astrophysics

Astronomy

2

X-Ray, Binary, Neutron Star

Scientific paper

On March 17, 2010, MAXI/GSC and RXTE/ASM data detected a flare from the prototypical ultracompact X-ray binary 4U 1820-30 that has a duration of at least 57 min and a peak 4-10 keV flux of 1.9 Crab units. Given the duration and the fact that 4U 1820-30 for decades only exhibited fluxes below 0.5 Crab (e.g., Priedhorsky & Terrell, ApJ, 284, L17, 1984; Zdziarski et al., MNRAS 377, 1006, 2007) except during thermonuclear (type-I) X-ray bursts (e.g., Galloway et al., ApJS 179, 360, 2008), we tentatively identify this as a superburst.

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