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
Number of
Processing
Status of
Processing
Date of
Processing
Public
date
2606010101 305.377 40.446 78.226 2.087 58554.6088 58554.7676 6483.0 52 2 VALIDATED 58560.7 58748
2606010102 305.378 40.445 78.226 2.087 58555.1222 58555.2181 1856.0 52 2 VALIDATED 58560.8 58749
2606010201 305.378 40.446 78.227 2.087 58582.0081 58582.4801 10454.0 52 2 VALIDATED 58587.7 58776
2606010401 305.377 40.446 78.226 2.087 58639.4003 58639.8650 7973.0 52 2 VALIDATED 58643.9 58833
2606010402 305.376 40.444 78.224 2.087 58640.0469 58640.2502 2877.0 52 3 VALIDATED 58644.6 58834
2606010501 305.378 40.446 78.226 2.087 58674.9377 58674.9514 949.0 52 3 VALIDATED 58679.7 58868
2606010502 305.378 40.446 78.226 2.087 58675.0022 58675.5961 10065.0 52 2 VALIDATED 58679.7 58869
2606010601 305.378 40.446 78.226 2.087 58700.5342 58700.7558 4700.0 52 3 VALIDATED 58780.1 58894
2606010602 305.378 40.446 78.226 2.087 58702.0165 58702.6042 5240.0 52 4 VALIDATED 58780.1 58896
2606010701 305.378 40.446 78.226 2.087 58722.5480 58722.9565 4358.0 52 3 VALIDATED 58780.1 58916
2606010702 305.378 40.446 78.226 2.087 58723.0123 58723.3435 3182.0 52 2 VALIDATED 58780.1 58917
2606010703 305.379 40.444 78.226 2.085 58732.5606 58732.9588 5164.0 52 3 VALIDATED 58780.1 58926
2606010704 305.380 40.445 78.226 2.085 58733.1338 58733.1523 1323.0 52 3 VALIDATED 58780.1 58927
2606010705 305.378 40.446 78.227 2.087 58743.5755 58743.5784 192.0 52 3 VALIDATED 58780.1 58937
2606010801 305.378 40.446 78.226 2.087 58762.2173 58762.9359 6034.0 52 2 VALIDATED 58767.8 58956
2606010802 305.377 40.446 78.226 2.087 58762.9907 58763.1294 2025.0 52 3 VALIDATED 58770.8 58957
2606010803 305.377 40.445 78.225 2.087 58764.7296 58764.9304 981.0 52 2 VALIDATED 58770.9 58958
2606010804 305.377 40.445 78.226 2.087 58765.1160 58765.9618 7321.0 52 1 VALIDATED 58770.9 58959
2606010805 305.378 40.446 78.226 2.087 58766.0190 58766.3562 6200.0 52 1 VALIDATED 58771.0 58960
2606010806 305.377 40.446 78.226 2.087 58776.1410 58776.6654 1065.0 52 2 VALIDATED 58781.6 58970
2606010807 305.376 40.445 78.225 2.088 58777.8812 58777.8918 289.0 0 3 VALIDATED 58782.7 58971
2606010808 305.377 40.446 78.226 2.087 58778.0154 58778.6041 4648.0 52 2 VALIDATED 58782.7 58972
2606010809 305.372 40.445 78.223 2.090 58784.0786 58784.8579 61.0 52 3 VALIDATED 58789.7 58978
2606010810 305.380 40.442 78.224 2.084 58785.5632 58785.8900 0.0 52 3 VALIDATED 58790.8 58979
2606010811 305.376 40.458 78.235 2.095 58786.0806 58786.0834 0.0 52 2 VALIDATED 58790.9 58980