NICER observation list: Target ID 263401

Abstract

We propose a campaign of joint NuSTAR and NICER observations of the quiescent neutron star Cen X-4, to study the relationship between its soft X-ray flux level and its hard X-ray spectrum. The hard X-ray spectrum has been hypothesized to be due to thermal bremsstrahlung from active accretion onto the neutron star, and may transit to synchrotron emission at low flux. If the bremsstrahlung/active accretion hypothesis is correct, we should be able to measure spectral changes with our proposed campaign.
Obsid RA DEC l b Start End Exposure Number of
Modules		 Number of
Processing		 Status of
Processing		 Date of
Processing		 Public
date
2634010101 224.589 -31.667 332.242 23.884 58690.7815 58690.9250 2783.0 52 2 VALIDATED 58695.9 59064
2634010102 224.591 -31.669 332.242 23.882 58691.1042 58691.5579 4339.0 52 1 VALIDATED 58695.9 59065
2634010201 224.591 -31.669 332.242 23.881 58735.1011 58735.8414 7464.0 52 3 VALIDATED 58739.6 59109
2634010301 224.594 -31.669 332.244 23.880 58855.2585 58855.8683 194.0 50 2 VALIDATED 58859.8 59229
2634010302 224.592 -31.668 332.243 23.881 58856.0308 58856.4488 328.0 50 2 VALIDATED 58860.8 59230
2634010401 224.591 -31.669 332.242 23.881 58886.1150 58886.9775 17985.0 52 3 VALIDATED 58898.0 59260
2634010402 224.592 -31.669 332.242 23.881 58887.0197 58887.0421 1626.0 52 2 VALIDATED 58898.1 59261
2634010501 224.590 -31.669 332.242 23.882 58904.7736 58904.9831 3619.0 52 3 VALIDATED 58910.9 59278
2634010502 224.591 -31.669 332.242 23.882 58905.0964 58905.6928 11919.0 52 3 VALIDATED 58912.0 59279
2634010601 224.588 -31.666 332.241 23.885 59050.7378 59050.8907 2614.0 52 3 VALIDATED 59054.7 59424
2634010602 224.589 -31.667 332.242 23.884 59050.9962 59051.9206 10073.0 52 3 VALIDATED 59055.6 59425
2634010603 224.593 -31.669 332.243 23.881 59291.7765 59291.9768 1767.0 52 1 VALIDATED 59296.0 59665
2634010604 224.593 -31.669 332.244 23.881 59292.0346 59292.4553 3475.0 52 2 VALIDATED 59296.6 59666
2634010605 224.591 -31.669 332.242 23.881 59304.5582 59304.9725 2587.0 52 5 VALIDATED 59314.8 59678
2634010606 224.591 -31.669 332.242 23.881 59305.0308 59305.7898 4844.0 52 5 VALIDATED 59314.8 59679
2634010701 224.595 -31.669 332.245 23.880 59220.4280 59220.8321 0.0 49 4 VALIDATED 59243.9 59594
2634010702 224.593 -31.669 332.244 23.880 59221.0088 59221.7374 916.0 49 4 VALIDATED 59244.0 59595