NICER observation list: Target ID 669701

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 5. 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
6697010101 288.798 10.945 45.365 -0.219 60022.7250 60022.8602 3901.0 48 6 VALIDATED 60036.3 60036
6697010201 288.798 10.943 45.364 -0.220 60035.2488 60035.4044 2121.0 51 5 VALIDATED 60048.1 60049
6697010301 288.800 10.945 45.366 -0.221 60042.4762 60042.5699 4346.0 51 8 VALIDATED 60057.9 60056
6697010401 288.799 10.946 45.366 -0.220 60048.9988 60049.9727 5107.0 51 7 VALIDATED 60069.7 60063
6697010601 288.798 10.946 45.366 -0.219 60056.4773 60056.8104 4094.0 51 5 VALIDATED 60067.0 60070
6697010701 288.798 10.946 45.366 -0.219 60062.4938 60062.8200 3711.0 51 6 VALIDATED 60072.9 60076
6697010801 288.799 10.947 45.367 -0.220 60077.9671 60077.9792 857.0 51 1 VALIDATED 60082.2 60091
6697010802 288.799 10.946 45.366 -0.219 60078.0317 60078.1727 2508.0 51 2 VALIDATED 60084.5 60092
6697010901 288.798 10.946 45.366 -0.219 60084.7391 60084.8333 3735.0 51 1 VALIDATED 60091.8 60098
6697011001 288.798 10.945 45.365 -0.219 60091.5188 60091.6046 3837.0 51 4 VALIDATED 60107.2 60105
6697011101 288.798 10.945 45.365 -0.219 60097.5891 60097.9262 7684.0 51 5 VALIDATED 60109.7 60111
6697011201 288.799 10.946 45.366 -0.220 60104.6775 60104.9424 2779.0 51 4 VALIDATED 60115.4 60118
6697011202 288.802 10.944 45.366 -0.223 60105.2009 60105.2148 385.0 51 5 VALIDATED 60117.0 60119
6697011301 288.799 10.946 45.367 -0.220 60112.0969 60112.1898 2584.0 51 3 VALIDATED 60122.0 60126
6697011501 288.798 10.947 45.366 -0.218 60126.5597 60126.8289 3171.0 51 5 VALIDATED 60137.7 60140
6697011601 288.797 10.947 45.367 -0.218 60133.3889 60133.5389 3710.7 51 4 VALIDATED 60145.0 60147
6697011701 288.803 10.947 45.369 -0.222 60140.6859 60140.8915 3279.0 51 4 VALIDATED 60152.5 60154
6697011801 288.800 10.946 45.367 -0.220 60147.3963 60147.5433 3362.0 51 4 VALIDATED 60160.1 60161
6697011901 288.798 10.946 45.366 -0.219 60154.1055 60154.4377 3844.0 51 5 VALIDATED 60166.2 60168
6697012001 288.798 10.946 45.366 -0.219 60160.5722 60160.8315 3616.0 51 3 VALIDATED 60172.6 60174
6697012101 288.801 10.942 45.363 -0.223 60168.4396 60168.5766 1735.0 51 4 VALIDATED 60180.1 60182
6697012102 288.798 10.945 45.365 -0.219 60171.6683 60172.0000 1541.0 51 3 VALIDATED 60182.0 60186
6697012201 288.801 10.944 45.366 -0.223 60174.8310 60174.9730 2490.0 51 4 VALIDATED 60185.3 60188
6697012301 288.798 10.945 45.365 -0.220 60182.0664 60182.3350 2562.0 51 5 VALIDATED 60198.8 60196
6697012401 288.798 10.947 45.366 -0.218 60189.5616 60189.7616 3344.0 51 3 VALIDATED 60203.3 60203
6697012501 288.798 10.946 45.366 -0.219 60196.3133 60196.7743 3819.5 42 3 VALIDATED 60208.7 60210
6697012601 288.798 10.946 45.366 -0.219 60203.0283 60203.5711 3680.0 51 4 VALIDATED 60215.1 60217
6697012701 288.798 10.947 45.367 -0.218 60210.1470 60210.7359 3800.0 51 4 VALIDATED 60220.8 60224
6697012801 288.801 10.946 45.368 -0.222 60217.6888 60217.9596 2307.0 51 3 VALIDATED 60228.3 60231
6697012802 288.798 10.947 45.367 -0.219 60218.0754 60218.0885 968.0 51 3 VALIDATED 60228.4 60232
6697012901 288.802 10.948 45.369 -0.222 60224.2001 60224.5310 1080.0 42 4 VALIDATED 60235.3 60238
6697013001 288.798 10.946 45.365 -0.219 60231.1662 60231.2532 2143.0 42 4 VALIDATED 60241.9 60245
6697013401 288.799 10.945 45.365 -0.220 60259.3081 60259.4566 0.7 0 5 VALIDATED 60271.9 60273
6697013402 288.798 10.945 45.366 -0.219 60260.8120 60260.9493 1279.0 51 3 VALIDATED 60272.1 60274
6697013403 288.798 10.945 45.366 -0.219 60261.0053 60261.2722 3339.0 51 4 VALIDATED 60272.1 60275
6697013501 288.798 10.946 45.366 -0.219 60266.0252 60266.4829 62.0 16 4 VALIDATED 60278.0 60280