[vsnet-alert 7300] Re: (Fwd) a new, fast X-ray transient

["Jim Phillips" <phillips@vzpacifica.net>]

Unsubscribe vsnet-alert@00ruri.kusastro.kyoto-u.ac.jp
phillips@vzpacifica.net

----- Original Message ----- 
From: "Ryoko Ishioka" <ishioka@kusastro.kyoto-u.ac.jp>
To: <vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp>
Sent: Thursday, April 18, 2002 5:37 AM
Subject: [vsnet-alert 7299] (Fwd) a new, fast X-ray transient


> 
> Date: Wed, 17 Apr 2002 14:36:22 -0400 (EDT)
> From: Ron Remillard <rr@space.mit.edu>
> Subject: [vsnet-alert 0] a new, fast X-ray transient
> 
> XTE J1901+014: a new, fast X-ray transient
> 
> The RXTE All-Sky Monitor has discovered a fast X-ray transient that
> was initially thought to be a gamma ray burst, reported on the GCN
> network as GRB020406. The event began on 2002 April 6.76268, lasting
> more than 2 min and less than 3.15 hr, with a peak flux of 0.9 Crab
> (2-12 keV).  (see http://xte.mit.edu/xtej1901+104). The ASM data show
> rapid evolution to a very hard spectrum during this outburst, but the
> IPN instruments failed to detect the source above 15 keV (K. Hurley,
> private communication). Furthermore, archival ASM data show a previous
> outburst at the same position on 1997 June 21.215, which was longer
> than 6 min and less than 8 hr, with a peak flux of 0.4 Crab. The
> combined ASM observations yield a best position: R.A. = 19h01m36s,
> Decl. = +1 26'.4 (equinox J2000.0; estimated 3' uncertainty in
> R.A. and 2' uncertainty in Decl.).  The error box contains one very
> faint, unidentified X-ray source from the Einstein Galactic Plane
> Survey: 2E1859.1+0122 (J2000 R.A. = 19h01m40.2s, Decl. = +1 27' 13'';
> error radius 48''; Hertz and Grindlay 1988, AJ, 96, 233). The time
> scale for these eruptions are reminiscent of the microquasar and black
> hole binary V4641 Sgr, so we strongly encourage optical and radio
> observations of XTE J1901+014.
> 
>         R. A. Remillard (M.I.T.) and D. A. Smith (U. Michigan), for
> the RXTE ASM Team at M.I.T. and NASA Goddard Space Flight Center.
> 
> ---------------------
> end

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp