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