NICER observation list: Target ID 673901

Abstract

We have recently identified a candidate transitional millisecond pulsar (tMSP) in the globular cluster Terzan 6. This source, X2, usually has luminosities between 2.5e33 and 6e34 erg/s. However, RXTE monitoring of the cluster suggests that in rare instances the source enters an outburst state (>1e36 erg/s). During one of these outburst states indications for the presence of X-ray pulsations were seen in a very short RXTE observation. Here we propose a NICER monitoring program of Terzan 6 to catch X2 in an outburst state and confirm the presence of pulsations. We request 114 (0.5 ks) observations with a cadence of 2 days. Although the chances of catching an outburst are small (20% in Cycle 5), identification of X2 as a tMSP would add a valuable new member to a very small class of sources.
Obsid RA DEC l b Start End Exposure Number of
Modules		 Number of
Processing		 Status of
Processing		 Date of
Processing		 Public
date
6739010101 267.697 -31.274 358.574 -2.164 60001.1163 60001.1236 0.0 51 5 VALIDATED 60013.4 60015
6739010102 267.692 -31.274 358.572 -2.160 60004.0710 60004.0810 476.0 51 4 VALIDATED 60016.9 60018
6739010201 267.694 -31.275 358.572 -2.162 60006.0811 60006.0954 1170.0 51 5 VALIDATED 60021.9 60020
6739010301 267.694 -31.275 358.572 -2.162 60008.0779 60008.0981 1716.0 51 5 VALIDATED 60022.1 60022
6739010401 267.700 -31.276 358.573 -2.167 60010.0786 60010.0870 668.0 51 2 VALIDATED 60017.5 60024
6739010501 267.697 -31.278 358.571 -2.166 60012.2731 60012.2806 559.0 51 3 VALIDATED 60022.4 60026
6739010601 267.697 -31.276 358.573 -2.165 60014.1414 60014.1486 406.0 51 3 VALIDATED 60024.1 60028
6739010701 267.694 -31.275 358.572 -2.162 60016.1520 60016.1613 691.0 51 4 VALIDATED 60025.8 60030
6739010901 267.691 -31.272 358.573 -2.158 60020.7352 60020.8039 0.0 51 6 VALIDATED 60030.9 60034
6739011001 267.700 -31.277 358.572 -2.167 60022.2191 60022.2280 0.0 51 6 VALIDATED 60036.3 60036
6739011101 267.693 -31.275 358.571 -2.162 60024.2660 60024.2799 650.0 51 6 VALIDATED 60036.4 60038
6739011201 267.693 -31.275 358.572 -2.162 60026.3307 60026.3472 698.0 51 5 VALIDATED 60042.0 60040
6739011301 267.693 -31.275 358.571 -2.162 60028.3567 60028.3639 588.0 51 6 VALIDATED 60039.1 60042
6739011401 267.693 -31.275 358.571 -2.162 60030.3977 60030.4280 1609.0 51 6 VALIDATED 60042.3 60044
6739011501 267.693 -31.276 358.571 -2.162 60031.3167 60031.3333 1014.0 51 4 VALIDATED 60042.3 60045
6739011601 267.693 -31.276 358.571 -2.162 60034.0808 60034.0903 94.0 51 5 VALIDATED 60044.8 60048
6739011701 267.693 -31.276 358.571 -2.162 60036.4766 60036.4903 597.0 51 8 VALIDATED 60048.1 60050
6739011702 267.692 -31.272 358.574 -2.160 60124.2840 60124.2936 693.0 51 3 VALIDATED 60134.0 60138
6739011801 267.694 -31.276 358.571 -2.163 60038.2750 60038.2829 570.0 51 4 VALIDATED 60048.2 60052
6739011901 267.694 -31.275 358.571 -2.162 60040.0157 60040.0278 354.0 51 4 VALIDATED 60053.9 60054
6739012001 267.693 -31.275 358.571 -2.162 60042.1634 60042.1757 971.0 51 8 VALIDATED 60057.9 60056
6739012101 267.694 -31.275 358.572 -2.162 60044.0158 60044.0310 585.0 51 6 VALIDATED 60058.0 60058
6739012201 267.693 -31.275 358.572 -2.162 60046.8620 60046.8688 524.0 51 5 VALIDATED 60058.2 60060
6739012301 267.694 -31.276 358.571 -2.163 60048.8568 60048.8632 428.0 51 4 VALIDATED 60059.7 60062
6739012401 267.692 -31.275 358.571 -2.160 60050.3439 60050.3528 670.0 51 4 VALIDATED 60062.1 60064
6739012501 267.694 -31.276 358.571 -2.162 60052.4868 60052.4993 956.0 51 7 VALIDATED 60069.9 60066
6739012601 267.692 -31.275 358.571 -2.161 60054.0940 60054.1021 506.0 51 3 VALIDATED 60063.8 60068
6739012701 267.693 -31.275 358.571 -2.162 60056.1008 60056.1111 567.0 51 4 VALIDATED 60065.9 60070
6739012801 267.696 -31.270 358.577 -2.161 60058.0914 60058.0975 258.0 51 6 VALIDATED 60068.2 60072
6739012901 267.693 -31.275 358.571 -2.161 60060.1560 60060.1639 242.0 51 4 VALIDATED 60070.1 60074
6739013001 267.697 -31.271 358.576 -2.162 60062.0893 60062.1035 842.0 51 6 VALIDATED 60072.9 60076
6739013101 267.698 -31.273 358.576 -2.164 60064.6095 60064.7440 847.0 51 5 VALIDATED 60074.7 60078
6739013201 267.694 -31.270 358.576 -2.160 60066.1586 60066.4194 621.0 51 5 VALIDATED 60076.8 60080
6739013901 267.698 -31.276 358.573 -2.166 60079.9690 60079.9775 509.0 51 3 VALIDATED 60088.4 60093
6739014001 267.697 -31.277 358.572 -2.166 60082.2947 60082.3090 914.0 51 3 VALIDATED 60094.5 60096
6739014101 267.697 -31.278 358.570 -2.166 60084.4303 60084.4377 572.0 51 1 VALIDATED 60091.7 60098
6739014201 267.694 -31.275 358.572 -2.162 60086.3715 60086.3817 0.0 51 3 VALIDATED 60096.9 60100
6739014301 267.694 -31.275 358.572 -2.162 60088.5648 60088.5792 1128.0 51 2 VALIDATED 60095.4 60102
6739014401 267.695 -31.276 358.572 -2.163 60090.4250 60090.4317 409.0 51 5 VALIDATED 60111.7 60104
6739014501 267.693 -31.275 358.571 -2.162 60092.6165 60092.6243 471.0 51 5 VALIDATED 60105.1 60106
6739014701 267.693 -31.275 358.571 -2.162 60096.0293 60096.0392 713.0 51 4 VALIDATED 60107.7 60110
6739014801 267.693 -31.276 358.571 -2.162 60098.2301 60098.2375 570.0 51 5 VALIDATED 60109.8 60112
6739014901 267.693 -31.277 358.570 -2.162 60101.1905 60101.1994 685.0 51 4 VALIDATED 60111.9 60115
6739015001 267.693 -31.277 358.570 -2.162 60102.4810 60102.4921 872.0 51 5 VALIDATED 60115.1 60116
6739015101 267.694 -31.278 358.570 -2.163 60104.4146 60104.4300 1107.5 51 4 VALIDATED 60115.4 60118
6739015201 267.694 -31.276 358.571 -2.163 60105.2616 60105.2701 590.0 51 5 VALIDATED 60117.0 60119
6739015301 267.694 -31.276 358.571 -2.162 60106.2287 60106.2373 592.0 51 4 VALIDATED 60117.1 60120
6739015302 267.693 -31.276 358.571 -2.162 60108.7488 60108.7639 1092.0 51 5 VALIDATED 60118.9 60122
6739015401 267.695 -31.276 358.571 -2.163 60110.4804 60110.4920 853.0 51 3 VALIDATED 60121.8 60124
6739015501 267.694 -31.276 358.571 -2.162 60112.4162 60112.4365 1627.0 51 4 VALIDATED 60124.2 60126
6739015601 267.693 -31.275 358.571 -2.162 60114.4324 60114.4421 493.0 51 4 VALIDATED 60126.1 60128
6739015701 267.694 -31.275 358.572 -2.162 60116.8025 60116.8132 642.0 51 5 VALIDATED 60129.4 60130
6739015801 267.694 -31.275 358.571 -2.162 60118.6745 60118.6829 490.0 51 4 VALIDATED 60129.6 60132
6739015901 267.693 -31.275 358.572 -2.162 60120.7371 60120.7463 626.0 51 4 VALIDATED 60131.8 60134
6739016001 267.693 -31.275 358.571 -2.161 60122.1566 60122.1650 633.0 51 3 VALIDATED 60132.1 60136
6739016201 267.693 -31.272 358.574 -2.160 60126.3477 60126.3593 870.0 51 5 VALIDATED 60137.7 60140
6739016301 267.692 -31.272 358.573 -2.159 60128.6046 60128.6162 599.0 51 5 VALIDATED 60140.0 60142
6739016401 267.693 -31.275 358.571 -2.161 60130.3433 60130.3537 519.2 51 4 VALIDATED 60143.0 60144
6739016501 267.693 -31.271 358.575 -2.160 60132.7993 60132.8100 398.0 51 4 VALIDATED 60143.3 60146
6739016601 267.695 -31.270 358.577 -2.160 60134.1566 60134.1653 571.0 51 4 VALIDATED 60145.1 60148
6739016701 267.699 -31.272 358.577 -2.164 60136.0326 60136.1030 706.0 42 4 VALIDATED 60147.2 60150
6739017001 267.697 -31.277 358.571 -2.166 60142.8249 60142.8926 443.0 51 5 VALIDATED 60157.3 60156
6739017101 267.697 -31.276 358.572 -2.165 60144.6304 60144.8926 603.0 51 4 VALIDATED 60157.6 60158
6739017201 267.699 -31.277 358.573 -2.166 60146.3069 60146.3766 695.0 51 6 VALIDATED 60163.8 60160
6739017301 267.697 -31.278 358.571 -2.166 60148.8861 60148.8931 471.0 51 4 VALIDATED 60161.7 60162
6739017401 267.698 -31.278 358.571 -2.166 60149.9830 60149.9905 553.0 51 4 VALIDATED 60164.0 60163
6739017501 267.698 -31.278 358.571 -2.166 60152.1112 60152.1193 561.0 51 4 VALIDATED 60164.4 60166
6739017601 267.694 -31.275 358.572 -2.162 60154.0600 60154.0715 367.0 51 4 VALIDATED 60164.6 60168
6739017701 267.695 -31.275 358.572 -2.162 60156.6440 60156.7178 1238.0 51 4 VALIDATED 60172.1 60170
6739017801 267.697 -31.277 358.572 -2.165 60158.4340 60158.4451 872.0 51 3 VALIDATED 60172.4 60172
6739017901 267.697 -31.277 358.572 -2.165 60160.8861 60160.8935 459.0 51 3 VALIDATED 60172.6 60174
6739018001 267.695 -31.275 358.573 -2.163 60162.7528 60162.7613 554.0 51 3 VALIDATED 60175.0 60176
6739018101 267.694 -31.275 358.572 -2.162 60164.2380 60164.2463 582.0 51 3 VALIDATED 60178.0 60178
6739018201 267.693 -31.275 358.571 -2.162 60166.2366 60166.2444 553.0 51 3 VALIDATED 60178.2 60180
6739018301 267.693 -31.276 358.571 -2.162 60168.8173 60168.8255 555.0 42 4 VALIDATED 60180.1 60182
6739018401 267.693 -31.275 358.572 -2.162 60170.4475 60170.4574 779.0 51 4 VALIDATED 60181.9 60184
6739018501 267.693 -31.276 358.571 -2.162 60172.3032 60172.3128 726.0 42 3 VALIDATED 60182.1 60186
6739018601 267.693 -31.276 358.571 -2.162 60174.5619 60174.5738 893.0 51 4 VALIDATED 60185.3 60188
6739018701 267.693 -31.276 358.571 -2.162 60176.6927 60176.7002 61.0 42 5 VALIDATED 60189.8 60190
6739018801 267.694 -31.277 358.570 -2.163 60178.4993 60178.5104 830.5 42 4 VALIDATED 60190.0 60192
6739018901 267.695 -31.278 358.570 -2.164 60180.3067 60180.3171 425.5 42 2 VALIDATED 60190.2 60194
6739019201 267.694 -31.276 358.571 -2.163 60186.1138 60186.1250 674.0 42 3 VALIDATED 60199.8 60200
6739019301 267.694 -31.276 358.571 -2.163 60188.0488 60188.0602 534.0 42 3 VALIDATED 60203.0 60202
6739019401 267.696 -31.278 358.570 -2.165 60190.1144 60190.2516 476.0 42 2 VALIDATED 60203.5 60204
6739019801 267.693 -31.275 358.572 -2.161 60198.6287 60198.6363 0.0 42 3 VALIDATED 60209.0 60212