NICER observation list: Target ID 563101

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 4. NICER is the only mission capable of frequently monitoring this important new state. We also request a 25 ks NuSTAR ToO 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
5631010101 288.798 10.946 45.366 -0.219 59647.9096 59647.9900 3653.0 49 5 VALIDATED 59662.2 59661
5631010201 288.797 10.944 45.363 -0.219 59654.0259 59654.1133 2505.0 52 5 VALIDATED 59666.0 59668
5631010301 288.798 10.946 45.365 -0.219 59661.5766 59661.7197 3034.0 52 4 VALIDATED 59672.8 59675
5631010401 288.799 10.944 45.365 -0.221 59669.0299 59669.2937 0.0 52 5 VALIDATED 59678.9 59683
5631010501 288.798 10.944 45.364 -0.220 59675.2715 59675.2968 908.0 52 6 VALIDATED 59684.8 59689
5631010601 288.798 10.946 45.366 -0.219 59682.1711 59682.2669 3282.0 52 6 VALIDATED 59691.7 59696
5631010701 288.798 10.946 45.366 -0.219 59689.0080 59689.1516 1500.0 52 6 VALIDATED 59698.7 59703
5631011001 288.799 10.946 45.366 -0.219 59714.3090 59714.5782 3669.0 52 7 VALIDATED 59724.6 59728
5631011101 288.799 10.946 45.367 -0.220 59717.3424 59717.5461 2885.0 52 7 VALIDATED 59732.8 59731
5631011201 288.798 10.945 45.365 -0.219 59724.1819 59724.4505 3358.0 52 4 VALIDATED 59740.7 59738
5631011301 288.798 10.945 45.365 -0.219 59731.6032 59731.9352 3413.0 52 4 VALIDATED 59741.0 59745
5631011401 288.798 10.946 45.366 -0.219 59738.0565 59738.1463 1827.0 52 5 VALIDATED 59748.2 59752
5631011501 288.798 10.945 45.366 -0.219 59745.2245 59745.3766 3155.0 52 4 VALIDATED 59755.8 59759
5631011601 288.800 10.946 45.367 -0.221 59752.5162 59752.6120 3277.0 52 4 VALIDATED 59764.4 59766
5631011701 288.798 10.946 45.366 -0.219 59759.4896 59759.8208 3405.0 52 3 VALIDATED 59769.9 59773
5631011801 288.797 10.948 45.367 -0.217 59764.8444 59764.9954 3053.0 52 5 VALIDATED 59774.8 59778
5631011901 288.798 10.946 45.366 -0.219 59773.0437 59773.1326 3870.0 52 4 VALIDATED 59784.9 59787
5631012001 288.801 10.947 45.368 -0.221 59780.6592 59780.8049 3772.0 52 4 VALIDATED 59790.9 59794
5631012101 288.799 10.946 45.367 -0.219 59787.0432 59787.4351 1627.0 52 5 VALIDATED 59800.3 59801
5631012201 288.798 10.946 45.365 -0.219 59794.2674 59794.4024 2981.0 52 5 VALIDATED 59805.1 59808
5631012301 288.798 10.945 45.365 -0.219 59800.9757 59800.9805 272.0 52 4 VALIDATED 59810.8 59814
5631012302 288.797 10.944 45.364 -0.219 59801.0403 59801.2461 2686.7 52 5 VALIDATED 59830.6 59815
5631012401 288.798 10.946 45.366 -0.219 59808.2812 59808.4243 2829.0 52 5 VALIDATED 59818.0 59822
5631012501 288.798 10.946 45.366 -0.219 59815.0042 59815.9144 3900.0 52 6 VALIDATED 59829.2 59829
5631012601 288.798 10.946 45.366 -0.219 59822.0389 59822.4324 3458.0 52 2 VALIDATED 59829.8 59836
5631012701 288.798 10.946 45.366 -0.219 59829.3224 59829.4660 3232.0 52 10 VALIDATED 59849.8 59843
5631012801 288.798 10.945 45.366 -0.220 59836.0310 59836.1750 3339.0 52 4 VALIDATED 59846.2 59850
5631012901 288.798 10.946 45.366 -0.219 59843.8373 59843.9204 3303.0 52 6 VALIDATED 59855.1 59857
5631013001 288.798 10.947 45.367 -0.219 59850.6051 59850.7556 2616.0 52 6 VALIDATED 59861.8 59864
5631013101 288.799 10.946 45.367 -0.219 59857.2551 59857.3394 3005.0 52 5 VALIDATED 59866.9 59871
5631013201 288.799 10.946 45.366 -0.220 59864.3597 59864.7556 1554.0 52 6 VALIDATED 59874.8 59878
5631013301 288.797 10.945 45.365 -0.219 59871.0556 59871.1449 2883.0 52 6 VALIDATED 59880.7 59885
5631013401 288.800 10.945 45.366 -0.221 59879.0102 59879.3373 1440.0 52 6 VALIDATED 59888.8 59893
5631013601 288.799 10.946 45.366 -0.220 59892.5612 59892.7102 2038.0 52 3 VALIDATED 59902.0 59906
5631013701 288.799 10.945 45.366 -0.220 59899.1995 59899.3487 3796.0 49 4 VALIDATED 59908.9 59913