NICER observation list: Target ID 260601

Abstract

PSR J2021+4026 is a radio-quiet gamma-ray pulsar in the Gamma Cygni SNR, discovered in a blind search of Fermi-LAT data. Its thermal X-ray pulsations make this one of the few pulsars that can be studied simultaneously in X-rays and gamma rays. In 2011, J2021 underwent a transition into a low gamma-ray flux state, accompanied by an increase in spindown rate (anti-glitch), and a change in pulse profile, making it the first variable gamma-ray pulsar. Deep XMM observations taken in the low flux state, and after its recovery reveal subtle changes in X-ray behavior. Recently, J2021 underwent another mode transition. We propose NICER monitoring observations to study the X-ray timing and spectral properties of J2021 as it evolves from its current low gamma-ray flux back to its normal state.
Obsid RA DEC l b Start End Exposure Number of modules Status of Processing Date of Processing Public date
2606010101 305.377 40.446 78.22612 2.08733 58554.6088 58554.7676 6483.00000 52 VALIDATED 58560.7 58748
2606010102 305.378 40.445 78.22582 2.08694 58555.1222 58555.2181 1856.00000 52 VALIDATED 58560.8 58749
2606010201 305.378 40.446 78.22656 2.08671 58582.0081 58582.4801 10454.00000 52 VALIDATED 58587.7 58776
2606010401 305.377 40.446 78.22588 2.08726 58639.4003 58639.8650 7973.00000 52 VALIDATED 58643.9 58833
2606010402 305.376 40.444 78.22389 2.08718 58640.0469 58640.2502 2877.00000 52 VALIDATED 58644.6 58834
2606010501 305.378 40.446 78.22650 2.08685 58674.9377 58674.9514 949.00000 52 VALIDATED 58679.7 58868
2606010502 305.378 40.446 78.22650 2.08695 58675.0022 58675.5961 10065.00000 52 VALIDATED 58679.7 58869
2606010601 305.378 40.446 78.22646 2.08738 58700.5342 58700.7558 4700.00000 52 VALIDATED 58780.1 58894
2606010602 305.378 40.446 78.22621 2.08721 58702.0165 58702.6042 5240.00000 52 VALIDATED 58780.1 58896
2606010701 305.378 40.446 78.22637 2.08695 58722.5480 58722.9565 4358.00000 52 VALIDATED 58780.1 58916
2606010702 305.378 40.446 78.22647 2.08693 58723.0123 58723.3435 3182.00000 52 VALIDATED 58780.1 58917
2606010703 305.379 40.444 78.22588 2.08541 58732.5606 58732.9588 5164.00000 52 VALIDATED 58780.1 58926
2606010704 305.380 40.445 78.22603 2.08523 58733.1338 58733.1523 1323.00000 52 VALIDATED 58780.1 58927
2606010705 305.378 40.446 78.22666 2.08724 58743.5755 58743.5784 192.00000 52 VALIDATED 58780.1 58937
2606010801 305.378 40.446 78.22618 2.08710 58762.2173 58762.9359 6034.00000 52 VALIDATED 58767.8 58956
2606010802 305.377 40.446 78.22602 2.08717 58762.9907 58763.1294 2025.00000 52 VALIDATED 58770.8 58957
2606010803 305.377 40.445 78.22522 2.08727 58764.7296 58764.9304 981.00000 52 VALIDATED 58770.9 58958
2606010804 305.377 40.445 78.22583 2.08723 58765.1160 58765.9618 7321.00000 52 VALIDATED 58770.9 58959
2606010805 305.378 40.446 78.22616 2.08718 58766.0190 58766.3562 6200.00000 52 VALIDATED 58771.0 58960
2606010806 305.377 40.446 78.22613 2.08734 58776.1410 58776.6654 1065.00000 52 VALIDATED 58781.6 58970
2606010807 305.376 40.445 78.22512 2.08812 58777.8812 58777.8918 289.00000 0 VALIDATED 58782.7 58971
2606010808 305.377 40.446 78.22624 2.08733 58778.0154 58778.6041 4648.00000 52 VALIDATED 58782.7 58972
2606010809 305.372 40.445 78.22277 2.09011 58784.0786 58784.8579 61.00000 52 VALIDATED 58789.7 58978
2606010810 305.380 40.442 78.22406 2.08360 58785.5632 58785.8900 0.00000 52 VALIDATED 58790.8 58979
2606010811 305.376 40.458 78.23527 2.09476 58786.0806 58786.0834 0.00000 52 VALIDATED 58790.9 58980
2606010901 305.380 40.447 78.22804 2.08653 58795.0109 58795.4815 9377.00000 52 VALIDATED 58801.0 58989
2606010902 305.383 40.447 78.22969 2.08471 58812.7518 58812.7570 218.00000 52 VALIDATED 58817.1 59006
2606010903 305.378 40.446 78.22684 2.08746 58813.7810 58813.9167 355.00000 52 VALIDATED 58817.7 59007
2606010904 305.375 40.448 78.22654 2.09003 58814.0991 58814.8181 299.00000 52 VALIDATED 58818.7 59008
2606010905 305.378 40.446 78.22630 2.08728 58852.9315 58852.9439 523.00000 52 VALIDATED 58858.8 59046
2606010906 305.377 40.446 78.22621 2.08730 58853.0000 58853.9778 1537.00000 52 VALIDATED 58858.8 59047
2606010907 305.374 40.445 78.22409 2.08880 58854.4831 58854.4998 99.00000 52 VALIDATED 58859.7 59048
2606011001 305.378 40.446 78.22665 2.08696 58885.4819 58885.5610 0.00000 50 VALIDATED 58889.7 59079
2606011002 305.378 40.446 78.22658 2.08710 58894.8396 58894.8452 233.00000 0 VALIDATED 58900.9 59088
2606011003 305.378 40.446 78.22699 2.08720 58895.6803 58895.8160 837.00000 50 VALIDATED 58901.0 59089
2606011004 305.378 40.449 78.22881 2.08864 58896.1942 58896.4653 697.00000 50 VALIDATED 58901.7 59090
2606011005 305.379 40.448 78.22865 2.08760 58899.5563 58899.6926 43.00000 50 VALIDATED 58904.1 59093
2606011006 305.378 40.445 78.22583 2.08695 58907.9507 58907.9539 0.00000 50 VALIDATED 58912.2 59101
2606011007 305.378 40.446 78.22681 2.08716 58908.3326 58908.9883 3414.00000 50 VALIDATED 58912.7 59102
2606011008 305.378 40.446 78.22645 2.08682 58909.2995 58909.9550 2572.00000 50 VALIDATED 58913.7 59103
2606011009 305.378 40.446 78.22656 2.08699 58910.0097 58910.4074 1277.00000 50 VALIDATED 58992.3 59104
2606011101 305.377 40.446 78.22625 2.08761 58851.4470 58851.7322 3022.00000 52 VALIDATED 58858.7 59045
2606011201 305.378 40.446 78.22652 2.08678 58880.5196 58880.9313 1879.00000 50 VALIDATED 58884.9 59074