Archive for June, 2010

MAXI alert report status in Jun 2010

Wednesday, June 30th, 2010

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

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

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Daily update on 2010/06/26 was canceled, because of the ISS antenna maintenance.

Monday, June 28th, 2010

The real time telemetory down-link had been disabled during 2010/06/25 18:48 and 2010/06/27 06:08. It is because it was necessary to cool the antenna of ISS that became hot for high soloar anlge.   This data of MAXI at the period was stored in the ISS recorder.  It is scheduled to analyze it again when data is delivered.

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MAXI observation outage

Wednesday, June 9th, 2010

All mission instruments on the MAXI payload had been tuned off since 6/5 13:24 to 6/6 08:50 (UT) for an emergent trouble of ISS JEM ATCS (Active Thermal Control System). The system was now recovered and the operation returned to the normal observation mode.

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X-ray Burst from Cir X-1 detected by MAXI

Tuesday, June 8th, 2010

Following our report “MAXI/GSC detects X-ray brightening of Cir X-1″ issued in Atel #2608, RXTE and Swift made follow-up observations, in which type-I X-ray bursts were detected at a position consistent with that of Cir X-1 (Atel #2643, #2650, #2651, #2653). We re-examined the data of the MAXI persistent/non-bursting source in the Cir X-1 region. We detected only one source at the position of (RA,DEC) = (230.04 +- 0.05, -57.27 +/- 0.03) (errors are statistical only). Considering the positional systematic error of 0.2 degree, the source location is consistent with that of Cir X-1. Furthermore, MAXI/GSC detected an X-ray burst at 2010-05-29 15:50:50, confirming the detections by RXTE and Swift. The two energy-band light curve is shown in the figure, which suggest spectral softening during the decay phase indicative of the type-I (thermonuclear) nature or the burst.

We thank Dr. Linares for encouraging this reanalysis.
lc_cirx-1_20100529

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