NICER observation list: Target ID 466202

Abstract

ESO 253-G003/ASASSN-14ko is a highly unique AGN that undergoes periodic flares every ~114 days with a negative, non-zero period derivative. There were 17 outbursts detected in V-/g-band ASAS-SN survey data during the last six years, with missing outbursts due only to seasonal gaps. Numerous flaring events are highly unusual for an AGN, which normally vary at a low-level following a damped random walk model. The precise origin of these flares remains unknown but this could be the first example of a repeating partial tidal disruption event (TDE). We propose to obtain NICER observations of three upcoming outbursts, which will be complemented by UV/optical monitoring, in order to fully characterize the X-ray evolution during the flares and compare the emission between flares over time.
Obsid RA DEC l b Start End Exposure Number of
Modules		 Number of
Processing		 Status of
Processing		 Date of
Processing		 Public
date
4662020101 81.324 -46.006 251.975 -33.708 59514.6715 59514.9285 1938.0 52 5 VALIDATED 59526.7 59528
4662020102 81.322 -46.002 251.971 -33.709 59514.9874 59515.3208 1152.0 52 5 VALIDATED 59526.7 59529
4662020201 81.325 -46.006 251.975 -33.707 59519.6397 59519.7803 2225.0 52 6 VALIDATED 59533.0 59533
4662020701 81.322 -46.008 251.977 -33.709 59528.5949 59528.9264 762.0 52 5 VALIDATED 59538.8 59542
4662020801 81.326 -46.006 251.975 -33.706 59529.7569 59529.8306 711.0 52 6 VALIDATED 59542.9 59543
4662020901 81.324 -46.005 251.975 -33.708 59530.7884 59530.9280 518.0 52 5 VALIDATED 59543.0 59544
4662021001 81.324 -46.006 251.975 -33.708 59531.4995 59531.8315 631.0 52 5 VALIDATED 59543.0 59545
4662021901 81.328 -46.006 251.976 -33.705 59540.3861 59540.5264 2351.0 52 6 VALIDATED 59553.7 59554
4662022001 81.328 -46.006 251.976 -33.705 59541.5498 59541.6900 2638.0 52 5 VALIDATED 59551.9 59555
4662022101 81.327 -46.006 251.976 -33.705 59542.5144 59542.6616 3790.0 52 7 VALIDATED 59552.8 59556
4662022201 81.326 -46.006 251.976 -33.706 59543.5488 59543.6338 3257.0 52 5 VALIDATED 59553.8 59557
4662022301 81.325 -46.006 251.976 -33.707 59544.0718 59544.9373 5037.0 52 6 VALIDATED 59554.7 59558
4662022401 81.327 -46.006 251.975 -33.706 59545.3562 59545.9574 6294.0 52 6 VALIDATED 59555.7 59559
4662022402 81.327 -46.006 251.976 -33.706 59546.0019 59546.0831 2505.0 52 5 VALIDATED 59555.8 59560
4662022501 81.327 -46.007 251.976 -33.705 59546.3250 59546.7924 3699.0 52 6 VALIDATED 59556.7 59560
4662022601 81.326 -46.005 251.975 -33.706 59547.0350 59547.6954 3549.0 52 7 VALIDATED 59557.6 59561
4662022701 81.327 -46.006 251.975 -33.706 59548.0030 59548.8569 4532.0 52 7 VALIDATED 59558.6 59562
4662022801 81.326 -46.006 251.975 -33.707 59549.1012 59549.6961 2885.0 52 7 VALIDATED 59559.6 59563
4662022901 81.325 -46.005 251.975 -33.707 59550.0039 59550.6644 3202.0 52 7 VALIDATED 59560.6 59564
4662023001 81.326 -46.005 251.975 -33.706 59551.0380 59551.7618 2938.0 52 7 VALIDATED 59561.6 59565
4662023101 81.325 -46.006 251.975 -33.707 59552.0067 59552.9882 3862.0 52 7 VALIDATED 59562.6 59566
4662023201 81.326 -46.006 251.975 -33.707 59553.2972 59553.8919 3296.0 52 7 VALIDATED 59563.6 59567
4662023301 81.325 -46.006 251.975 -33.707 59554.2655 59554.8604 3362.0 52 7 VALIDATED 59565.7 59568
4662023401 81.326 -46.006 251.975 -33.707 59555.0397 59555.6352 2721.0 52 6 VALIDATED 59565.7 59569
4662023501 81.325 -46.006 251.975 -33.707 59556.2891 59556.5514 1519.0 52 6 VALIDATED 59566.6 59570
4662023601 81.326 -46.006 251.975 -33.707 59557.2344 59557.3785 3278.0 52 5 VALIDATED 59566.7 59571
4662023701 81.325 -46.006 251.976 -33.707 59558.0270 59558.1669 2521.0 52 6 VALIDATED 59567.6 59572
4662023801 81.325 -46.007 251.976 -33.707 59559.0444 59559.1863 2278.0 52 6 VALIDATED 59568.6 59573
4662023901 81.325 -46.006 251.975 -33.707 59560.0778 59560.2197 2495.0 52 6 VALIDATED 59569.7 59574
4662024001 81.326 -46.006 251.976 -33.707 59561.2401 59561.5109 3822.0 52 6 VALIDATED 59571.6 59575
4662024101 81.326 -46.006 251.975 -33.706 59562.1434 59562.3502 3057.0 52 5 VALIDATED 59571.6 59576
4662024201 81.325 -46.006 251.975 -33.707 59563.3700 59563.5764 3272.0 52 7 VALIDATED 59573.6 59577
4662024301 81.325 -46.006 251.976 -33.707 59564.3538 59564.5447 2518.0 52 7 VALIDATED 59574.6 59578
4662024401 81.326 -46.006 251.975 -33.707 59569.0507 59569.3310 3177.0 52 6 VALIDATED 59578.8 59583
4662024501 81.323 -46.003 251.971 -33.708 59574.1486 59574.3542 1646.0 52 8 VALIDATED 59588.7 59588
4662024601 81.326 -46.006 251.976 -33.707 59579.2512 59579.3396 3594.0 52 6 VALIDATED 59588.8 59593
4662024801 81.324 -46.006 251.975 -33.708 59583.9713 59583.9831 808.0 52 7 VALIDATED 59593.7 59597
4662024802 81.324 -46.006 251.975 -33.708 59584.1027 59584.3056 2891.0 52 6 VALIDATED 59593.7 59598
4662025201 81.325 -46.006 251.975 -33.707 59604.5056 59604.7005 1282.0 52 6 VALIDATED 59614.8 59618
4662025301 81.327 -46.008 251.978 -33.706 59609.3463 59609.6745 723.0 52 7 VALIDATED 59619.6 59623
4662025401 81.327 -46.005 251.975 -33.705 59613.8648 59613.9493 1884.0 52 7 VALIDATED 59623.7 59627
4662025402 81.326 -46.005 251.975 -33.706 59613.9939 59614.0074 407.0 52 7 VALIDATED 59623.7 59628
4662025501 81.327 -46.005 251.975 -33.706 59618.9704 59618.9810 681.0 52 7 VALIDATED 59628.7 59632
4662025502 81.328 -46.005 251.975 -33.705 59619.0150 59619.1537 1855.0 52 6 VALIDATED 59628.7 59633
4662025503 81.325 -46.006 251.975 -33.707 59629.0316 59629.2977 1749.0 52 4 VALIDATED 59640.3 59643
4662025601 81.325 -46.006 251.976 -33.707 59624.8204 59624.9625 438.0 52 5 VALIDATED 59634.8 59638
4662025602 81.326 -46.006 251.975 -33.706 59625.0137 59625.0271 604.0 52 4 VALIDATED 59634.9 59639
4662025603 81.325 -46.006 251.975 -33.707 59634.7731 59634.9153 2497.0 52 5 VALIDATED 59646.0 59648
4662025701 81.325 -46.006 251.976 -33.707 59639.1625 59639.4296 2920.0 52 6 VALIDATED 59649.8 59653