MAXI alert status in October 2010

October 31st, 2010 by Mitsuhiro Kohama

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

2990: Short X-ray Transient Detection by MAXI/GSC Tomida 2010 Oct 31 9:49
2970: MAXI/GSC detects a new activity from Be pulsar A0535+262 Mihara, 2010 Oct 25 21:33
2959: MAXI/GSC detects an X-ray transient MAXI J1409-619 Yamaoka, 2010 Oct 20 11:06

Daily Spectra for ten sources are open.

October 28th, 2010 by Tatehiro Mihara

We open daily spectra of  ten bright sources today. There is a spectrum plot following light curves and images for each source page. The spectrum is fitted with wabs * power-law model and the parameters are written in the plot. One can download the spectrum, background and response files by clicking “Download spectrum, background and response” below the plot. After extracting the tar.gz file, one can fit the spectrum with your XSPEC software. The sources whose spectrum is available are Crab, Sco X-1, Cen X-3, Her X-1, GX 9+9, GX 9+1, GX 13+1, GX 17+2, GRS 1915+105, and Cyg X-2.

 gscall_b_c0345_mjd55495_binspec

The daily spectrum of Crab, which is  available at  http://maxi.riken.jp/top/index.php?cid=1&jname=J0534+220

MAXI/GSC detects a new activity from X-ray pulsar A0535+262

October 26th, 2010 by Motoki Nakajima

We reported in Atel#2970 (Mihara et al.) that MAXI/GSC detected a new activity from X-ray pulsar A0535+262. The figure shows the recent four light curves folded with 115-day outburst period. The current consecutive activities exhibit the outbursts and precursor events at phases ~0.2 and ~0.95, respectively. The phase zero is taken at MJD 55153.5, which is the periastron passage prior to the previous giant outburst.


MAXI/GSC detects an X-ray transient MAXI J1409-619

October 20th, 2010 by Satoshi NAKAHIRA

The MAXI/GSC has detected a faint X-ray transient, MAXI J1409-619, with a position of (R.A., Dec) = (212.26, -61.95) = (14h09m02s.4, -61d57m00s.0) (J2000) with a typical error of about 0.2 degrees.
The 4-10 keV images and light curves taken by GSC are shown below. Detailed results will be reported in an ATel. The bright dMe star 1RXS J141108.2-615601 is marginally within an error circle, but follow-up observations are required to solve the nature of this source.

1RXS_J141108_2-615601_025day_4.0-10.0keVlab_4-10kev_img_radec

MAXI alert report status in September 2010

September 30th, 2010 by Mitsuhiro Kohama

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

MAXI/GSC Light curve of MAXI J1659-152

September 28th, 2010 by sugizaki

We reported in ATEL#2873 (Negoro et al.) that MAXI/GSC detected a new X-ray transient, MAXI J1659-152 at (RA,Dec)=(264.79, -15.27) (J2000), whose position is consistent with the location of GRB100925A reported in GCN#11296 (Mangano et al.).

The GSC light curve since UT 2010-09-21 00:00 (MJD 55460.0) is shown in the below. The X-ray brightening seems to start around 2010-09-25 00:00 (MJD 55464.0) . The latest light-curve data will be updated on the data-product web page.

maxij1659_mjd55460_55466_bin6.0hr

Registration start to 4th International MAXI workshop

September 2nd, 2010 by Mitsuhiro Kohama

We  are pleased to announce the 4th International MAXI workshop “The First Year of MAXI: Monitoring variable X-ray sources” to be held at Aoyama Gakuin University (Shibuya, Tokyo, Japan) during November 30th and December 02nd in 2010.
Please direct your browser to the conference web site for additional details and access to the registration form.
http://maxi.riken.jp/FirstYear/

MAXI workshop LOC

MAXI alert report status in August 2010

August 31st, 2010 by Mitsuhiro Kohama

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

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

Gamma-ray burst (GRB 100823A) detected

August 25th, 2010 by Motoko Serino

MAXI GSC detected a gamma-ray burst (GRB 100823A). The image and the light curves of the burst are shown below. The position of the source came into the field of view of MAXI GSC ~10s before the trigger of Swift/BAT. The burst was seen for about 25s within the transit of ~50s.

GRB 100823A image

MAXI GSC scans the position of the burst from right top to left bottom on the image. The position of the red cross in the image is the position of the burst reported by Swift BAT.

The raw light curve (not corrected for collimator response) of GRB100823A.

The raw light curves (not corrected for collimator response) of GRB100823A.

MAXI alert report status in July 2010

July 31st, 2010 by Mitsuhiro Kohama

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.