NICER observation list: Target ID 359201

Abstract

Swift J1858.6-0814 is a very unusual X-ray binary. It shows extreme rapid variability, by factors >200, and has a very hard X-ray spectrum with strong structure around the iron line. Strong signatures of winds have been observed in wavebands from IR to soft X-rays. Such an accretion state has only previously been seen in short outbursts of V404 Cyg and V4641 Sgr. Swift J1858.6-0814 is currently undergoing a prolonged outburst giving an unprecedented opportunity to study this unusual mode of accretion: we propose to continue the existing NICER monitoring to find out more about this mode and detect any transitions to other accretion states.
Obsid RA DEC l b Start End Exposure Number of modules Status of Processing Date of Processing Public date
3592010101 284.646 -8.237 26.38995 -5.32382 58909.3104 58909.3965 0.00000 50 VALIDATED 58913.7 58923
3592010102 284.651 -8.237 26.39211 -5.32839 58938.6227 58938.6333 719.00000 52 VALIDATED 58942.6 58952
3592010201 284.648 -8.237 26.39062 -5.32592 58912.1415 58912.1731 251.00000 50 VALIDATED 58917.7 58926
3592010301 284.646 -8.237 26.38998 -5.32402 58915.0465 58915.1296 483.00000 52 VALIDATED 58919.8 58929
3592010401 284.646 -8.238 26.38941 -5.32409 58918.2089 58918.3530 933.00000 52 VALIDATED 58981.9 58932
3592010402 284.646 -8.238 26.38941 -5.32431 58919.0480 58919.2523 852.92111 52 VALIDATED 58992.4 58933
3592010501 284.646 -8.237 26.38945 -5.32373 58920.9842 58920.9988 545.00000 52 VALIDATED 58924.8 58934
3592010502 284.646 -8.237 26.38951 -5.32392 58921.0488 58921.3139 1929.00000 52 VALIDATED 58925.6 58935
3592010601 284.647 -8.237 26.39008 -5.32475 58923.1791 58923.3229 2368.00000 52 VALIDATED 58927.6 58937
3592010602 284.646 -8.237 26.39022 -5.32424 58924.0826 58924.3569 2683.00000 52 VALIDATED 58928.7 58938
3592010701 284.646 -8.240 26.38738 -5.32566 58927.4484 58927.5197 601.00000 52 VALIDATED 58931.6 58941
3592010801 284.646 -8.238 26.38920 -5.32408 58929.9575 58929.9839 2017.00000 52 VALIDATED 58933.6 58943
3592010901 284.645 -8.238 26.38893 -5.32366 58933.5225 58933.5903 2190.00000 52 VALIDATED 58937.6 58947
3592011001 284.643 -8.238 26.38765 -5.32198 58936.2949 58936.3766 1506.00000 52 VALIDATED 58940.6 58950
3592011101 284.645 -8.238 26.38880 -5.32395 58938.6859 58938.7625 2485.00000 52 VALIDATED 58942.6 58952
3592011201 284.646 -8.238 26.38917 -5.32399 58941.9709 58941.9889 987.00000 52 VALIDATED 58947.9 58955
3592011202 284.646 -8.238 26.38921 -5.32419 58942.0354 58942.0532 811.00000 52 VALIDATED 58947.9 58956
3592011301 284.646 -8.238 26.38877 -5.32430 58945.4759 58945.5513 1692.00000 52 VALIDATED 58949.9 58959
3592011401 284.646 -8.237 26.38996 -5.32404 58948.1061 58948.1356 1951.00000 52 VALIDATED 58952.6 58962
3592011501 284.646 -8.239 26.38835 -5.32473 58951.0765 58951.1081 2087.00000 52 VALIDATED 58955.6 58965
3592011601 284.646 -8.237 26.38974 -5.32437 58954.1120 58954.2560 641.00000 52 VALIDATED 58961.0 58968
3592011701 284.645 -8.237 26.38949 -5.32360 58957.0167 58957.1600 913.00000 52 VALIDATED 58961.6 58971
3592011801 284.645 -8.236 26.39013 -5.32284 58960.8260 58960.9049 2378.00000 52 VALIDATED 58964.6 58974
3592011901 284.645 -8.235 26.39128 -5.32238 58963.4090 58963.6875 3261.00000 52 VALIDATED 58967.7 58977
3592012001 284.645 -8.237 26.38959 -5.32344 58968.1887 58968.2697 2334.00000 52 VALIDATED 58973.7 58982
3592012101 284.646 -8.234 26.39296 -5.32287 58969.7355 58969.8169 2577.00000 52 VALIDATED 58973.8 58983
3592012201 284.646 -8.234 26.39294 -5.32265 58971.9932 58972.1984 2538.00000 52 VALIDATED 58981.0 58986
3592012701 284.649 -8.237 26.39122 -5.32617 58987.0434 58987.1271 1884.00000 52 VALIDATED 58993.8 59001
3592012801 284.647 -8.237 26.39062 -5.32537 58990.0131 58990.1618 3855.00000 52 VALIDATED 59001.6 59004
3592012901 284.646 -8.238 26.38923 -5.32385 58994.3988 58994.5419 2900.00000 52 VALIDATED 58998.9 59008
3592013001 284.646 -8.238 26.38935 -5.32378 58996.0135 58996.1558 3102.00000 52 VALIDATED 59000.7 59010
3592013101 284.645 -8.238 26.38919 -5.32375 58998.5952 58998.6011 432.00000 52 VALIDATED 59002.7 59012
3592013102 284.645 -8.238 26.38875 -5.32398 58999.4342 58999.4634 2297.00000 52 VALIDATED 59004.7 59013
3592013201 284.645 -8.238 26.38885 -5.32337 59002.6067 59002.8836 2574.00000 52 VALIDATED 59011.9 59016
3592013301 284.645 -8.238 26.38900 -5.32318 59005.3130 59005.3359 1395.00000 52 VALIDATED 59012.8 59019
3592013401 284.645 -8.238 26.38903 -5.32361 59008.6640 59008.7433 2359.00000 52 VALIDATED 59026.8 59022
3592013501 284.646 -8.238 26.38923 -5.32418 59011.3111 59011.3854 2363.00000 52 VALIDATED 59016.7 59025
3592013601 284.647 -8.239 26.38872 -5.32621 59014.3458 59014.4396 2119.00000 52 VALIDATED 59018.8 59028
3592013701 284.646 -8.238 26.38888 -5.32413 59017.8322 59017.8618 1902.00000 52 VALIDATED 59022.7 59031
3592013801 284.646 -8.238 26.38877 -5.32430 59020.5436 59020.5738 2096.00000 52 VALIDATED 59024.9 59034
3592013901 284.647 -8.238 26.38912 -5.32534 59023.1258 59023.1565 1783.00000 52 VALIDATED 59027.6 59037
3592014001 284.646 -8.238 26.38940 -5.32387 59026.0944 59026.1252 1782.00000 52 VALIDATED 59030.7 59040
3592014101 284.646 -8.238 26.38955 -5.32424 59028.7590 59028.9479 1472.00000 52 VALIDATED 59032.7 59042
3592014102 284.646 -8.237 26.38983 -5.32454 59029.0067 59029.0125 72.00000 52 VALIDATED 59034.6 59043
3592014201 284.644 -8.237 26.38927 -5.32250 59031.5845 59031.7218 2316.00000 52 VALIDATED 59035.7 59045
3592014301 284.645 -8.237 26.38961 -5.32288 59035.1396 59035.2234 2604.00000 52 VALIDATED 59039.6 59049
3592014401 284.646 -8.237 26.38982 -5.32443 59038.3028 59038.7650 1907.00000 52 VALIDATED 59043.6 59052