NuSTAR ToO targets approved within the NuSTAR, Chandra, XMM-Newton, Swift, and INTEGRAL General Observer programs

    NuSTAR Target of Opportunity (ToO) observations may be proposed for in the NuSTAR, Chandra, XMM-Newton, Neil Gehrels Swift Observatory, and INTEGRAL General Observer (GO) programs.

    Last update: 2018-06-05

      Proposal title and abstracts are available here, or click on the Proposal number in the table below. Note that NuSTAR ToO and DDT observations may be requested at any time through the ToO/DDT observation request form which provides a list of currently active unanticipated ToO/DDT targets.

      Proposals will be marked with an orange background when they are triggered and a green background when they are completed. Targets that have yet to be identified have blank J2000 coordinates.

NuSTAR GO programs
ObsIDTarget Name
J2000 RA (deg)
J2000 Dec (deg)
Exposure (ks)
04025Staubert80401311GX 304-1195.32125-61.6018350
04060Ingram80401312GRS 1915+105288.7981310.9457830Triggered 2018-06-05
Coordinated with NICER
04083Margutti80402413Gravitational Wave 2x40
04085Margutti80402414SN INTERACTING 2x50Joint program with XMM 2x10ks
04096Neilsen80402315MAXI J1348-630207.053042-63.2741115x20Triggered 2019-01-28
Coordinated with NICER
04099Xu80401316MAXI J1631-479247.806-47.80560Triggered 2019-01-25
04101Tomsick80401317Swift J1858.6-0814284.6450-8.237750Triggered 2018-11-02
Joint program with Swift 10ks
04119Miniutti80401618Mrk 231194.0591756.8736180
04126Cerruti80401619VHE quasar flare 40Coordinated with HESS
04147Enoto80402320SGR 1806-20272.163850-20.41114030+30+20Triggered 2018-10-18
Coordinated with NICER
04161Degenaar804013214U 1608-52243.17917-52.4230660Joint program with Swift 11ks
04186Miller80401622Tidal Disruption Event 50
04206Madsen804016233C 273187.277922.052575
04210Bellm80401424GRB180720B0.5286-2.9189 80Triggered 2018-07-21
40 ks scheduled
04211Madejski804606253C 454.3343.4904216.1482240
04211Madejski80460626PKS 1510-089228.21042-9.0999440
04211Madejski80460627PKS 1222+216186.2266721.3795640
04211Madejski80460628PKS 1830-211278.4162 -21.0611 40Triggered 2019-04-05
04276Harrison80402529EM Gravitational Wave 10x20, 2x15020ks exposure counterpart search, then 2x150ks
04279Nelson80401330Fermi Detected Nova 60
04285Glesener80410201Solar active regions AR2710, 2712, 2738 2018-05-293x30Observations triggered 2018-05-22 Coordinated with Hi-C, FOXSI-3, and Hinode
Joint NuSTAR/Chandra GO programs
20400577J Neilsen80501303Black Hole Transienttbdtbd100
20400601J Steiner80501304Black Hole Transienttbdtbd60
Joint NuSTAR/XMM-Newton GO programs
078214Felix Fuerst80201011BH ToO 40Coordinated with 10 x 2 ks Swift observations. Program extended into cycle-17
078430Nanda Rea80202013XTE J1810-197272.46 -19.731 20+30+40+80Observations to be obtained over ~3 months. Triggered 2018-12-20
082053Norbert Schartel80401601NGC 156665.00167 -54.9378056 80Triggered 2018-09-24
082145Alessandro Papitto80401306ms pulsar 60
082359Nanda Rea80402308magnetar outburst 20,30,40,80
084079Fiona Harrison80501303BH hard state 40Cycle-18 observations begin 2019-05-01
084080Norbert Scharte80502604AGN outburst 2x50Cycle-18 observations begin 2019-05-01
084355Raffaella Margutti80502405Fast blue optical transient 2x25 + 2x40Cycle-18 observations begin 2019-05-01
084377Norbert Schartel80501606AGN minimum 80Cycle-18 observations begin 2019-05-01
084434Jelle Kaastra80501607AGN outflow 2x25Cycle-18 observations begin 2019-05-01
084469Jian Li80501608muon track neutrino 40Cycle-18 observations begin 2019-05-01
084526Luigi Piro80501609GW event 150Cycle-18 observations begin 2019-05-01
084545James Cour80502310GRO J1744-28266.137875-28.74083380Cycle-18 observations begin 2019-05-01
Joint NuSTAR/INTEGRAL GO programs
1640015Ingo Kreykenbohm80501301accreting x-ray pulsar 20
1640021Julia Alfonso-Garzon80501302H 1145-619177.000083-62/206916725Also coordinated with Swift
Joint NuSTAR/Swift GO programs
1417159Marianne Vestergaard80402610Mrk 59033.6399 -0.7668 2x20Triggered 2018-10-26
Joint NuSTAR/NICER GO programs
02122Melania Nynka80510301Magnetar 1tbdtbd40
02122Melania Nynka80510302Magnetar 2tbdtbd40
02131Abigail Stevens80511301Cyg X-2326.17145838.3214172x20
02131Abigail Stevens80511302XTE J1859+226284.67325022.65816720
02131Abigail Stevens80511303GX 339-4255.705750-48.78977820
02131Abigail Stevens805113044U 1630-47248.506708-47.39300020
02131Abigail Stevens80511305XTE J1550-564237.744375-56.47647220
02131Abigail Stevens80511306GRO J1655-40263.500583-39.84580520
02131Abigail Stevens805113074U 1543-47236.784500-47.66957320

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