Archive for July, 2010

MAXI alert report status in July 2010

Saturday, July 31st, 2010

MAXI team reported four detections of the transient  events  to Astronomer’s Telegram (ATEL) in July, 2010.

And  MAXI team also reported one XRF event to GCN: The Gamma-ray bursts Coordinates Network.

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MAXI/GSC detects brightening from Be/X-ray binary system, A0535+26

Thursday, July 1st, 2010

a0535_20100629

MAXI/GSC has detected X-ray brightening of the Be/X-ray binary system, A0535+26, since 2010 June 25 (UT). Its brightening has also been detected by the Fermi/GBM earth occultation, as reported in ATEL #2705.

The possible detection of the brightening by MAXI/GSC was first noticed on June 27 with a nova-search program involved in the ground pipeline data-reduction process.  The source was observed by GSC #3 camera, which is now in a test operation at a reduced high voltage of 1550V. Since the response calibration at the 1550 V is just being developed, the data are not currently used in the light curve archived on the MAXI public-web page.  Figure shows the light curve preliminarily obtained from the GSC #3 data.  The brightening since 2010 June 25 (MJD=55372) is clearly seen. The source had been unobservable until June 23 for the sun-protection area. The fluxes preliminarily estimated in 4–10 keV band are 43+-6 mCrab on June 25, 75+-6 mCrab on June 28, and 65+-6 mCrab on June 29. The data of June 27 and June 28 are not ready at the moment because the download of telemetry data during these period is delayed.

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