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[vsnet-alert 4682] multiwavelength observations of XTE J1118+480



We have scheduled satellite observations of the X-ray transient
XTE J1118+480 as detailed below. This target is bright (V~13)
and has low reddening, making it extremely suitable for multiwavelength 
studies.

Simultaneous or contemporaneous ground-based data is solicited.
High time resolution (faster than 10s cycle time) light curves
simultaneous with HST (timetag data) or RXTE, calibrated UBVRIJHKLM 
photometry, and optical spectrophotometry would be particularly useful.

The Coordinates of the source are (Masi, IAU Circ 7392):
R.A. = 11h18m10s.85
Decl. = +48o02'12".9 (equinox 2000.0)
and a finding chart is given on
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej1118.html

Thanks to all who responded to our earlier alert. 
Anyone obtaining data will be invited to participate in our
multiwavelength collaboration studying this source.

Carole Haswell, c.a.haswell@open.ac.uk
Wei Cui, cui@space.mit.edu
Reba M. Bandyopadhyay, reba@xeus.nrl.navy.mil
Rob Hynes, rih@astro.soton.ac.uk
Sylvain Chaty, s.chaty@open.ac.uk
Chris Shrader, shrader@grossc.gsfc.nasa.gov


HST observations of XTE J1118+480 on April 29, 2000.

Exposure       		Start UT	Duration (seconds)
---------------		--------	------------------
near UV Spect timetag	04:05:33	 820.00
near UV Spect timetag	04:26:44	 700.00
far UV spect timetag	05:42:04	1620.00
optical spect 		06:16:00	  60.00
optical spect		06:18:36	  60.00
optical spect		06:24:25	  75.00
optical spect		06:27:16	  75.00


XTE coverage simultaneous with HST on April 29, 2000.
        Start UT        End UT
        --------        --------
       	03:34:00 	04:34:00
	05:09:00	06:10:00


Other planned XTE coverage
        Start UT        End UT
        --------        --------
Apr 30	06:58:00	07:39:00
	08:16:00	08:46:00
May 1	11:24:00	11:55:00
May 4	05:20:00	05:37:00

Please note that with the exception of the Apr 29 one (with HST) the 
XTE times may change in a hurry.


	USA OBSERVING LOG FOR XTE J1118+480: 26-30 APRIL 2000
                                           := DOY 117-121 2000

 Year DOY UT Start  UT End     Observing Mode             ID#    Target
 ---- --- -------- --------   --------------------        --- -------------
 2000 117 00:18:36 00:31:45   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 02:00:56 02:09:30   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 03:43:40 03:49:39   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 05:27:00 05:31:59   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 07:10:03 07:16:46   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 08:50:57 09:12:35   M:1  Celestial Point [HC]   111 XTE_J1118+480
 2000 117 10:31:17 10:52:10   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 12:11:37 12:33:20   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 13:59:18 14:06:00   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 15:32:41 15:54:07   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 20:36:58 20:58:41   M:1  Celestial Point        111 XTE_J1118+480
 2000 117 22:19:09 22:37:01   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 03:25:59 03:32:32   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 05:09:19 05:14:19   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 06:52:22 06:58:48   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 08:33:59 08:44:16   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 10:14:09 10:34:30   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 11:54:12 12:16:06   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 13:34:49 13:56:32   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 15:15:17 15:36:52   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 16:56:20 17:18:03   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 22:01:44 22:20:36   M:1  Celestial Point        111 XTE_J1118+480
 2000 118 23:43:30 23:58:13   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 03:08:18 03:15:18   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 04:51:28 04:56:44   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 06:34:48 06:40:47   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 08:16:34 08:25:17   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 09:57:02 10:18:50   M:1  Celestial Point [HC]   111 XTE_J1118+480
 2000 119 11:37:05 11:58:25   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 13:24:10 13:32:23   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 14:58:02 15:19:28   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 16:39:12 17:00:38   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 18:20:15 18:41:58   M:1  Celestial Point        111 XTE_J1118+480
 2000 119 23:26:06 23:41:23   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 02:50:27 02:57:43   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 04:33:30 04:39:03   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 06:17:15 06:22:57   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 07:59:27 08:07:10   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 09:39:47 10:01:09   M:1  Celestial Point [HC]   111 XTE_J1118+480
 2000 120 11:19:57 11:40:44   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 13:00:17 13:22:00   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 14:40:37 15:02:20   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 16:21:31 16:43:14   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 18:02:51 18:24:34   M:1  Celestial Point        111 XTE_J1118+480
 2000 120 19:44:27 20:06:27   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 02:33:03 02:40:19   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 04:15:57 04:21:39   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 05:59:25 06:04:58   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 07:42:02 07:50:02   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 09:22:39 09:43:28   M:1  Celestial Point [HC]   111 XTE_J1118+480
 2000 121 11:02:59 11:23:03   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 14:23:30 14:44:56   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 16:04:23 16:25:49   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 17:45:26 18:07:09   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 19:27:03 19:48:46   M:1  Celestial Point        111 XTE_J1118+480
 2000 121 21:08:57 21:30:57   M:1  Celestial Point        111 XTE_J1118+480

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