From rhjellmi@aoc.nrao.edu Tue Jun 2 12:23 JST 1998 X-Sender: rhjellmi@aoc.nrao.edu Date: Mon, 01 Jun 1998 20:59:07 -0600 To: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp> From: "Robert M. (Bob) Hjellming" <rhjellmi@aoc.nrao.edu> Subject: Re: XTE J2012+381 Cc: HARMON@SSLMOR.msfc.nasa.gov, chaswell@star.cpes.susx.ac.uk, dasmith@space.mit.edu, ehm@space.mit.edu, gehrels@lheavx.gsfc.nasa.gov, giommi@napa.sdc.asi.it, jeanz@purple.sron.ruu.nl, rmw@lowell.edu.jem@head-cfa.harvard.edu, lewin@space.mit.edu, rr@space.mit.edu, shrader@grossc.gsfc.nasa.gov, stroh@pcasun1.gsfc.nasa.gov, swank@pcasun1.gsfc.nasa.gov, xteplan@xgo2.nascom.nasa.gov Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Length: 696 At 11:18 AM 6/2/98 +0900, Taichi Kato wrote: >XTE J2012+381 > > The improved position by Hjellming et al. (IAUC 6924), of the likely >radio counterpart: > > 20h 12m 37s.70 > +38o 11' 01".2 > > This location is very close (separation 1".3) to the following 18-th mag >star in USNO A1.0: > FYI Mark Wagner previously informed me about the coincidence of the radio source with this star. Unless we can establish short time scale radio variability this is now most likely a background quasar. Optical spectrum work is needed just in case we are lucky and this is the source of the 2012+38 X-rays - and is a star system that can be studied in detail in the optical. Cheers, Bob Hjellming