Dear Colleagues, As of December 9, 1999 we have resumed science operation with CGRO following the failure of gyro #3. We will be able to operate without any pointing degradation with the two remaining gyros. Please find below the Cycle 8 and Cycle 9 viewing periods as of December 12, 1999. Since the plans of October 5 (Cy 8) and November 30 (Cy 9), a viewing period has been added to the end of Cycle 8 for the gyro anomaly period (VP 835.5) and Cycle 9 has been initiated on 12/9/99 instead of 12/7/99. Best Regards, Neil Gehrels Compton Observatory Project Scientist ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ COMPTON CYCLE 8 VIEWING PLAN AS OF 12 DECEMBER 1999 VIEW Z-AXIS* GRO Z-AXIS* GALACTIC GRO X-AXIS* OSSE PRIMARY TARGET OSSE SECONDARY TARGET PER. START TARGET RA DEC LONG LAT RA DEC TARGET RA DEC TARGET RA DEC 801 12/01/98 c PKS 0208-512 30.05 -53.55 281.92 -60.68 249.64 -29.65 PKS 0208-512 32.69 -51.02 GAL 345+00 256.06 41.35 802 12/08/98 c PKS 0208-512 32.69 -51.02 276.11 -61.78 234.88 -36.85 PKS 0208-512 32.69 -51.02 GAL 330+0 241.12 -52.42 803.5 12/15/98 a S GAL POLE 7.03 -30.27 359.98 -84.00 260.72 -25.69 GAL 000-10 276.67 -33.76 No 2nd target 804 12/22/98 a GC SCAN 302.12 22.71 61.91 -5.44 253.05 -57.43 GAL 000-10 276.67 -33.76 No 2nd target 807.5 01/05/99 a 3C 273/3C 279 184.89 -3.19 287.46 58.72 275.81 -16.18 3C 279 194.05 -5.79 SCO X-1 244.98 -15.65 806.5# 01/19/99 c 3C 273/3C 279 192.27 0.26 301.63 63.13 282.17 -21.08 3C 273 187.28 2.05 SCO X-1 244.98 -15.65 806.7# 01/26/99 c 3C 279 193.99 -2.92 305.19 59.93 284.96 -18.36 3C 279 194.05 -5.79 SCO X-1 244.98 -15.65 805.5 02/02/99 a GP SCAN 352.81 -25.68 33.00 -72.00 266.76 8.16 GPLANE 286.45 -1.76 SUN 308.37 -18.78 808.5# 03/16/99 a XTE J1550-564 228.84 -55.81 322.22 1.58 328.26 -6.34 XTE J1550-564 237.75 -56.48 QSO 2251+158 343.49 16.15 809 03/23/99 a CEN LUP 225.19 -16.02 342.78 36.65 329.90 -41.49 GAL 350-10 271.01 -42.54 No 2nd target 810 03/30/99 a SUN 12.19 0.96 121.52 -61.90 277.91 77.39 SUN 11.32 4.87 CAS A SNR 350.81 58.81 811.5# 04/06/99 a GRS 1915+105 283.76 10.25 42.47 3.86 15.28 8.34 SUN 18.34 7.77 GRS 1915+105 288.80 10.95 812.5# 04/13/99 a GRS 1915+105 283.82 9.93 42.21 3.67 15.95 12.00 SUN 24.80 10.31 GRS 1915+105 288.80 10.95 813.5# 04/20/99 a GRS 1915+105 283.90 9.61 41.97 3.45 16.63 15.70 SUN 31.33 12.70 GRS 1915+105 288.80 10.95 814 04/27/99 a SUN 39.16 11.15 160.11 -44.00 288.04 61.32 SUN 37.31 14.72 CAS A SNR 350.81 58.81 815 05/04/99 a SUN 46.08 13.38 165.66 -38.23 293.00 58.75 SUN 44.54 16.66 CAS A SNR 350.81 58.81 816 05/11/99 c GEMINGA 98.47 17.77 195.13 4.26 12.63 -12.76 PKS 0528+134 82.73 13.53 No 2nd target 817.2 05/25/99 a GAL 335+0 249.71 -46.54 338.09 0.22 116.64 -32.90 GAL 335+00 246.81 -48.95 G266-01 132.97 -46.28 817.5# 05/27/99 a NOVA VEL 1999 233.26 -27.86 341.33 22.71 116.98 -39.95 NOVA VEL 1999 161.21 -52.43 SCO X-1 244.98 -15.64 819.5# 06/08/99 a NOVA VEL 1999 164.27 -53.17 286.17 5.94 91.09 12.22 NOVA VEL 1999 161.21 -52.43 CRAB PULSAR 83.63 22.01 820 06/22/99 a PUPPIS 142.16 -5.76 239.00 31.00 52.61 4.48 CSMIC BGND3 142.16 -5.76 CSMIC BGND4 53.02 4.45 820.5 06/25/99 a S/C ANOMALY 142.16 -5.76 239.00 31.00 52.61 4.48 --- --- 820 07/01/99 a PUPPIS 142.16 -5.76 239.00 31.00 52.61 4.48 CSMIC BGND3 142.16 -5.76 CSMIC BGND4 53.02 4.45 821 07/06/99 a PSR 1509-58 215.15 -51.39 316.80 9.06 126.55 1.12 NGC 4945 196.36 -49.47 SUN 108.67 22.33 822 07/13/99 a PSR 1509-58 215.28 -52.32 316.55 8.16 130.03 3.66 NGC 4945 196.36 -49.47 SUN 115.78 21.33 823 07/20/99 a PSR 1509-58 215.20 -53.24 316.19 7.32 133.41 6.09 NGC 4945 196.36 -49.47 SUN 122.79 20.03 824 07/27/99 a PSR 1509-58 217.98 -60.50 315.00 0.00 137.14 5.14 GAL 315+00 217.98 -60.50 SUN 129.67 18.46 825 08/03/99 a PSR 1509-58 234.50 -55.57 325.00 0.00 146.84 1.60 GAL 325+00 234.50 -55.57 SUN 136.44 16.64 826 08/10/99 a PSR 1509-58 234.50 -55.57 325.00 0.00 148.62 2.82 GAL 325+00 234.50 -55.57 SUN 143.08 14.60 827 08/17/99 a CYGNUS 312.93 53.79 92.00 6.00 176.11 28.09 NGC 4151 182.63 39.41 No 2nd target 828 08/31/99 a CYGNUS 303.27 50.71 86.00 9.00 173.82 27.47 NCG 4151 182.63 39.41 No 2nd target 829 09/14/99 c PKS 0528+134 80.41 21.85 183.05 -8.38 171.77 3.40 CRAB PULSAR 83.64 22.01 SUN 177.79 0.96 830.5# 09/28/99 a NOVA VEL 1999 154.45 -56.99 283.15 -0.14 202.84 23.33 NOVA VEL 1999 161.21 -52.43 SUN 190.92 -4.70 831.5# 10/05/99 a CYG X-1 296.13 34.24 69.06 5.03 217.55 -16.21 CYG X-1 299.58 35.20 NGC 3783 174.76 -37.74 831.7# 10/15/99 a XTE J1859+226 290.03 23.53 57.06 4.60 203.64 -8.24 XTE J1859+226 284.67 22.66 SUN 201.67 -9.09 832 10/26/99 a CYGNUS 308.12 39.45 78.64 -0.20 237.84 -22.30 CYG X-1 299.58 35.20 SCO X-1 244.98 -15.65 833.7 11/17/99 a LEONID SHOWER 312.44 -27.77 17.29 -36.95 216.46 -11.20 --- --- 833.9 11/18/99 c PKS 0208-512 32.69 -51.02 276.11 -61.78 242.72 -35.02 PKS 0208-512 32.69 -51.02 G337-0 248.87 -47.50 834.7 11/23/99 a CYG X-1 299.58 35.20 71.33 3.07 254.12 -44.83 CYG X-1 299.58 35.20 GAL 000+0 266.40 -28.94 835 11/30/99 a S GAL POLE 9.99 -28.73 359.96 -87.00 263.52 -27.34 GAL 000-10 276.67 -33.76 No 2nd target 835.5 12/06/99 a GYRO 3 FAILURE 12/09/99 END CYCLE 8 * Z-axis is pointing direction for COMPTEL and EGRET. OSSE points in X-Z plane. RA and DEC are J2000. # ToO = Target of Opportunity replan EGRET Mode: a = off b = fan beam c = Narrow FOV