NICER observation list: Target ID 464701

Abstract

GRS 1915+105 is a black hole binary known for its unique variability, strong winds, jets, and BH spin. After 20+ years in outburst, NICER detected a huge change in this iconic source: the X-ray flux dropped by 100x! Spectra suggest a large obscuring shroud, but what is this obscuring gas? The 'obscured' state is highly variable, with flares that reveal strong winds and highly-ionized absorption. We propose to study its long-term evolution with 35 weekly exposures of 2.7 ks in Cycle 2. NICER is the only mission capable of frequently monitoring this important new state. We also request 2x25 ks NuSTAR ToOs to constrain scattering and wind photoionziation. These observations will also grow a NICER legacy archive of obscured variability in GRS 1915+105.
Obsid RA DEC l b Start End Exposure Number of
Modules		 Number of
Processing		 Status of
Processing		 Date of
Processing		 Public
date
4647010101 288.798 10.945 45.365 -0.219 59279.2548 59279.3988 594.0 49 3 VALIDATED 59283.7 59293
4647010201 288.798 10.945 45.365 -0.219 59284.1599 59284.2576 1367.0 49 3 VALIDATED 59293.8 59298
4647010301 288.798 10.946 45.365 -0.219 59291.4555 59291.5437 2989.0 52 1 VALIDATED 59296.0 59305
4647010401 288.798 10.945 45.365 -0.219 59296.6859 59296.9551 3977.0 52 3 VALIDATED 59300.7 59310
4647010402 288.798 10.945 45.365 -0.219 59297.0090 59297.0824 1053.0 52 3 VALIDATED 59301.6 59311
4647010501 288.797 10.942 45.362 -0.220 59305.1708 59305.3116 0.0 52 5 VALIDATED 59314.8 59319
4647010601 288.800 10.945 45.366 -0.221 59312.1280 59312.2220 3085.0 52 6 VALIDATED 59321.8 59326
4647010701 288.798 10.945 45.365 -0.220 59319.1711 59319.2613 3279.0 52 6 VALIDATED 59330.9 59333
4647010801 288.798 10.946 45.366 -0.219 59326.3949 59326.5391 3573.0 52 6 VALIDATED 59336.8 59340
4647010802 288.799 10.945 45.365 -0.220 59329.8814 59329.9627 2439.0 52 5 VALIDATED 59340.0 59343
4647010803 288.797 10.947 45.366 -0.218 59330.0101 59330.0271 976.0 52 4 VALIDATED 59340.0 59344
4647010804 288.798 10.947 45.366 -0.218 59331.9480 59331.9535 205.0 52 5 VALIDATED 59341.9 59345
4647010901 288.798 10.946 45.366 -0.219 59332.9875 59332.9979 821.0 52 8 VALIDATED 59344.7 59346
4647010902 288.798 10.946 45.366 -0.219 59333.1748 59333.3854 2524.0 52 6 VALIDATED 59343.7 59347
4647011101 288.799 10.947 45.367 -0.220 59349.8377 59349.9806 2563.0 52 7 VALIDATED 59359.7 59363
4647011102 288.798 10.945 45.365 -0.219 59350.0323 59350.0451 994.0 52 6 VALIDATED 59359.7 59364
4647011201 288.798 10.946 45.366 -0.219 59354.3073 59354.5808 2290.0 52 7 VALIDATED 59367.1 59368
4647011301 288.798 10.945 45.365 -0.219 59361.3287 59361.4225 1910.0 52 6 VALIDATED 59371.7 59375
4647011401 288.797 10.943 45.362 -0.219 59368.6905 59368.7771 3614.0 52 7 VALIDATED 59378.7 59382
4647011501 288.798 10.946 45.366 -0.219 59375.0848 59375.4156 2359.0 52 6 VALIDATED 59384.8 59389
4647011601 288.801 10.944 45.366 -0.223 59382.0646 59382.1560 2193.0 52 6 VALIDATED 59391.8 59396
4647011701 288.799 10.944 45.365 -0.220 59389.6907 59389.7771 3365.0 52 5 VALIDATED 59401.9 59403
4647011801 288.798 10.946 45.366 -0.219 59396.2703 59396.4738 3036.0 52 5 VALIDATED 59407.9 59410
4647011901 288.798 10.946 45.366 -0.219 59403.3745 59403.4604 3241.0 52 4 VALIDATED 59412.9 59417
4647012001 288.798 10.947 45.367 -0.219 59409.3783 59409.6648 10628.0 52 7 VALIDATED 59422.6 59423
4647012002 288.798 10.947 45.367 -0.219 59410.7358 59410.9567 8756.0 52 6 VALIDATED 59420.7 59424
4647012101 288.798 10.947 45.367 -0.219 59417.0698 59417.2792 3930.0 52 6 VALIDATED 59426.7 59431
4647012201 288.799 10.946 45.367 -0.220 59424.1642 59424.9583 3630.0 52 9 VALIDATED 59471.8 59438
4647012301 288.798 10.946 45.365 -0.219 59431.5912 59431.7927 3402.0 52 5 VALIDATED 59466.3 59445
4647012401 288.798 10.946 45.365 -0.219 59439.0162 59439.4204 2670.0 52 6 VALIDATED 59468.2 59453
4647012501 288.798 10.945 45.365 -0.219 59445.2345 59445.3734 2581.0 52 6 VALIDATED 59471.1 59459
4647012601 288.798 10.946 45.366 -0.219 59452.0708 59452.1609 2705.0 52 6 VALIDATED 59464.8 59466
4647012701 288.798 10.945 45.366 -0.219 59459.2375 59459.3310 4421.0 52 5 VALIDATED 59468.7 59473
4647012801 288.798 10.946 45.366 -0.219 59466.0810 59466.2889 3975.0 52 4 VALIDATED 59476.7 59480
4647012901 288.798 10.945 45.365 -0.219 59474.4335 59474.6384 2970.0 52 8 VALIDATED 59490.6 59488
4647013001 288.798 10.946 45.366 -0.219 59481.7292 59481.8743 4086.0 52 6 VALIDATED 59491.6 59495
4647013101 288.798 10.946 45.366 -0.219 59487.1469 59487.2956 3796.0 52 6 VALIDATED 59496.7 59501
4647013201 288.798 10.946 45.366 -0.219 59494.7726 59494.9815 1702.0 52 7 VALIDATED 59504.6 59508
4647013202 288.798 10.946 45.365 -0.219 59495.0312 59495.0465 512.0 52 6 VALIDATED 59504.6 59509
4647013301 288.798 10.946 45.366 -0.219 59502.7133 59502.7931 2720.0 52 7 VALIDATED 59512.6 59516
4647013401 288.798 10.945 45.365 -0.219 59508.0734 59508.3431 3666.0 52 6 VALIDATED 59518.8 59522
4647013501 288.798 10.945 45.365 -0.219 59515.6155 59515.7553 2135.0 52 4 VALIDATED 59526.7 59529
4647013701 288.798 10.946 45.366 -0.219 59529.1182 59529.2092 3544.0 52 5 VALIDATED 59538.8 59543
4647013801 288.799 10.945 45.366 -0.220 59534.0894 59534.5676 15253.0 49 4 VALIDATED 59545.0 59548
4647013802 288.799 10.946 45.366 -0.220 59535.7782 59535.9912 7262.0 49 5 VALIDATED 59549.8 59549
4647013803 288.798 10.946 45.366 -0.219 59536.0259 59536.0558 2347.0 49 4 VALIDATED 59547.9 59550
4647013901 288.798 10.946 45.366 -0.219 59542.7422 59542.9477 750.0 49 7 VALIDATED 59552.8 59556
4647014001 288.799 10.949 45.369 -0.218 59549.9738 59549.9866 0.0 47 7 VALIDATED 59559.6 59563
4647014002 288.798 10.947 45.367 -0.218 59550.0384 59550.3736 0.0 47 6 VALIDATED 59559.7 59564