NuSTAR ToO targets approved within the NuSTAR, Chandra, XMM-Newton, Swift, NICER, 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, NICER mission, and INTEGRAL General Observer (GO) programs.

    Last update: 2022-02-24

      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.


Coordinated with XMM-Newton
NuSTAR GO ToO programs
Proposal
PI
ObsIDTarget Name
J2000 RA (deg)
J2000 Dec (deg)
Exposure (ks)
Comments
06238Vestergaard80602604Mrk 59033.63992-0.7667550+40+30Joint with 3x25 ks XMM-Newton and 3x10 ks Swift observations
Multi-cycle program
Triggered 2021-12-17
07027Krucker80710201 to 209The Sun119.8876 20.5287 25Coordinated with STIX on 2021-07-20
07027Krucker80711201The Sun 25Coordinated with STIX
07037Brightman80701507NGC 4045 ULX180.67651.96903100Coordinated with XMM-Newton
07052Ballhausen80701320EXO 2030+375308.06364337.63745650Triggered 2021-08-23
07055Jiang80701321Black hole transient 30
07070Doroshenko80702322IXPE Transient X-Ray pulsar 10, 20, 30, 40, 50Coordinated with IXPE
07072Doroshenko80702323GK Persei52.843.904283 x 30
07106Margutti80702508SN2022ffg153.45092918.1273252 x 50Coordinated with XMM-Newton
Triggered 2022-03-29
07112Yao80701509AT2021ehb46.9492547 40.3113484 40Triggered 2021-11-15
07112Yao80701510AT2022cmc203.6800149 33.2167887 40Triggered 2022-02-17
07113Neilsen80702324V4641 Sgr274.8401428 -25.4071803 5 x 20Coordinated with NICER (5x10 ks)
Triggered 2021-10-14
07114Li80701325LAT-undetected Nova 60
07119Borghese807013261E 161348-5055244.40096-51.0401775Coordinated with XMM-Newton
07128Xu80701327Black hole Hard State 60
07137Ballhausen80701328Cep X4324.8778756.98622100Trigger on one of three possible targets
07137Ballhausen80701329MXB 0656-072104.57204-7.20978
07137Ballhausen80701330Low luminosity CRSF source
07164McBride80701610IceCube-220303A267.7157325 10.9488175 40Triggered 2022-03-04
07164McBride80701611ICECUBE2 40
07167Tsuruta80701331SAX J1808.4-3658272.11475-36.9789750
07179Krumpe80701612EC 04570-520674.565-52.034100Triggered 2022-05-25
07179Krumpe80701613AGN flux drop2 100
07221Somalwar80702614TC0052307.69720944.2252688663 x 20Coordinated with Swift
Triggered 2022-03-08
07259Mehdipour80701616MRK 841226.0048710.4378950 Triggered 2022-01-03
07266Coughenour80701332MAXI J1803-298270.76162-29.8304650Triggered 2021-05-12
07277Yao80702511FBOT 30 + 50
07286Feng80701621PKS 0735+17114.5308071 17.7052772 40Triggered 2021-12-09
07302Jaodand80702333Transitional ms pulsar 3 x 30Coordinated with NICER
08003Mori80802325GC X-ray Transient 2x20Cycle-8 begins 2022-06-01
08033Ballhausen80801326New CRSF source 50Cycle-8 begins 2022-06-01
08041Jiang80801327Black hole transient 30Cycle-8 begins 2022-06-01
08079Coughenour80801328Transient Black Hole XRB 50Cycle-8 begins 2022-06-01
Coordinated with NICER
08107Krucker80802200The SUN 2x25Cycle-8 begins 2022-06-01
08110Paliya80801629Swift-BAT blazar 1 20Cycle-8 begins 2022-06-01
08110Paliya80801630Swift-BAT blazar 2 20Cycle-8 begins 2022-06-01
08115Miller80801631Bright TDE 50Cycle-8 begins 2022-06-01
08121Mondal80801332FXT/VFXT 30Cycle-8 begins 2022-06-01
08125Jaisawal808013334U 1820-30275.91904-30.3612845Cycle-8 begins 2022-06-01
Coordinated with NICER
08131Krumpe80801634AGN flux drop 100Cycle-8 begins 2022-06-01
08136Sokolovsky80801335New Nova 60Cycle-8 begins 2022-06-01
08166Feng80802636Candidate Nu-Blazar 2x40Cycle-8 begins 2022-06-01
08167Krumpe80801637AGN-ignition 1 50Cycle-8 begins 2022-06-01
08167Krumpe80801638AGN ignition 2 50Cycle-8 begins 2022-06-01
08171McBride80801639ICECUBE 1 40Cycle-8 begins 2022-06-01
08171McBride80801640ICECUBE 2 40Cycle-8 begins 2022-06-01
08201Shaw80801341GX 339-4255.70575-48.7897820Cycle-8 begins 2022-06-01
08201Shaw80801342Generic Black Hole LMXB 20Cycle-8 begins 2022-06-01
08211Arbet-Engels80801643BL Lac type transient 40Cycle-8 begins 2022-06-01
08219Draghis80802344Black hole transient 1 2x30Cycle-8 begins 2022-06-01
08219Draghis80802345Black hole transient 2 2x30Cycle-8 begins 2022-06-01
08219Draghis80802346Black hole transient 3 2x30Cycle-8 begins 2022-06-01
08226Pike80802347Unknown MAXI source 1 2x20Cycle-8 begins 2022-06-01
08226Pike80802348Unknown MAXI source 2 2x20Cycle-8 begins 2022-06-01
08226Pike80802349Unknown MAXI source 3 2x20Cycle-8 begins 2022-06-01
08227Arbet-Engels808016501ES 2344+514 low state356.7701751.7049720Cycle-8 begins 2022-06-01
08227Arbet-Engels808016511ES 2344+514 high state356.7701751.7049720Cycle-8 begins 2022-06-01
08233Lawther80802652Mrk 59033.63992-0.7667520+20+60+50Cycle-8 begins 2022-06-01
Coordinated with XMM-Newton & NICER
08234Haemmerich80801653Flaring Blazar 50Cycle-8 begins 2022-06-01
Coordinated with Gehrels-Swift
08236Bonnoli80801654New VHE FSRQ 40Cycle-8 begins 2022-06-01
08246Jaodand80802755Binary NS merger afterglow 100+75+75Cycle-8 begins 2022-06-01
Joint NuSTAR/Chandra GO ToO programs
21400516K Mori80602301Galactic Center transienttbdtbd2x20
22400400K Mori80702304Galactic Center VFXTtbdtbd2x20
22400529M Bachetti80701305M82 X-2148.96266769.67930380
22500172P Scholz80701506FRB 20200120E149.485068.818027Triggered 2020-12-02
Coordinated with Effelsberg 100m
22500192D Matthews80701407AT2020xnd
(Fast Blue Optical Transient)
335.008458-2.84036112x25, 2x40Triggered 2020-10-26
23400247Neilsen80802303Black Hole Transient 4 x 25
23500541Chornock80802504Intereacting SN 2 x 50
Joint NuSTAR/XMM-Newton GO ToO 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
082145Alessandro Papitto80401306ms pulsar 60
082359Nanda Rea80402308Swift J1818.0-1607274.5009167 -16.1311944 20,30,40,80Triggered 2020-03-20
084079Fiona Harrison80501303BH hard state 40
084080Norbert Schartel80502606NGC 156665.00167-54.937805650Triggered 2019-05-30
084080Norbert Schartel80502607IRAS 23226-3843351.350833-38.44694450Triggered 2019-10-16
084355Raffaella Margutti80502405AT2018cow244.001004 22.268024 2x25 + 2x40Triggered 2022-02-07
(single 130 ks exposure)
084377Norbert Schartel80501606AGN minimum 80
084434Jelle Kaastra80502609NGC 3227155.877519.86502x25Triggered 2019-11-11
084469Jian Li80501608muon track neutrino 40
084526Luigi Piro80501609GW event 150
084545James Court80502310GRO J1744-28266.137875-28.74083380
086127Allesandro Papitto80601304transitional ms pulsar60
086276Hannah Earnshaw8061305NGC 925 ULX-336.86458333.570278100Triggered 2020-08-11
086342Raffaella Margutti80602406SN2019yvr191.28389-0.459092x50Triggered 2020-06-18
086403Jennifer Sokoloski80602307T CrB239.87566725.92016750Triggered 2020-08-27
086460Nanda Rea80602315PSR J1846-0258281.60391667-2.9750277823,30,40,80Triggered 2020-08-02
088008Norbert Schartel80701608AGN outburst2x50
Coordinated with SALT or HET
088054Pierre-Olivier Petrucci80702310BH LMXB10x20
088218Nanda Rea80702311Magnetar outburst
088470Alessandro Papitto80701312accreting ms pulsar120
Coordinated with IXPE
090022Norbert Schartel80801601AGN Minimum 180Coordinated with HST
80801602AGN Minimum 280
090023Norbert Schartel80801603PG 0043+03911.4467924.17315660Coordinated with HST and HET/SALT
090245Missagh Mehdipour80801604AGN obscuration30Coordinated with HST
090251Daniel Stern80860601eROSITA-fader120
80860602eROSITA-fader620
80860603eROSITA-fader620
80860604eROSITA-fader620
80860605eROSITA-fader620
80860606eROSITA-fader620
090284Javier Garcia80801305BH transient40
090332David Matthews80802406FBOT2x25+2x40
090357Sergio Campana80801507GW counterpart160Coordinated with HST and NRAO
80801508GW counterpart260
Joint NuSTAR/INTEGRAL GO ToO programs
1740029Riccardo La Placa80601314Millisecond X-ray pulsar30Also coordinated with XMM-Newton
1740033Julia Alfonso-Garzon80501302H 1145-619177.000083-62.206916725Also coordinated with Swift
1840002Thomas Siegert80701501NS merger100
1840005Zhaosheng Li80701302Accreting ms pulsar30
Also coordinated with XMM-Newton, NICER, and HXMT
1840021Ingo Kreykenbohm80701303Accreting X-ray pulsar40
1940020Ingo Kreykenbohm80801301Transient accreting pulsar40
1940025Thomas Siegert80801502GW Neutron star merger100
Joint NuSTAR/Swift GO ToO programs
1619112Luigi Piro80601509FRB20112477.0125 26.060620Fast Radio burst
1619112Luigi Piro80601510Fast Radio burst 2tbd tbd 20
1619139Liliana Sandoval80602511Fast-Evolving Luminous Transienttbd tbd 3x20
1821098Kirill Sokolovsky80801310New Nova40
1821161Maria-Carla Nicotra80801311FRB120
1821161Maria-Carla Nicotra80801312FRB220
Joint NuSTAR/NICER GO ToO programs
04163Jeroen Homan807023184U 1820-30 275.91904-30.3612783x20Triggered 2021-06-12
05001Fiamma Capitanio80802313Transient XRB-12x30 + 20
Coordinated with IXPE
05001Fiamma Capitanio80802314Transient XRB-22x30 + 20
Coordinated with IXPE
05001Fiamma Capitanio80802315Transient XRB-32x30 + 20
Coordinated with IXPE
05065Riley Connors80802316Transient BH Binary4x20
05076Teruaki Enoto80802317Magnetar Outburst20+30+50
Coordinated with DSN
05079Alice Borghese80801318Magnetar Outburst-120
05079Alice Borghese80801319Magnetar Outburst-220
05099Federico Garcia80802320BH transient3x20
05106Filippo D'Ammando80801605Blazar40
05118Jingyi Wang80802321IGR J17091-3624257.2833-36.40673x20Triggered 2022-04-12
05131Joseph Neilsen80801322GRS 1915+105288.79816710.94580625
05140Guglielmo Mastroserio80801323BH transient50
05172Javier Garcia80801324BHB100

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