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: 2024-09-03

      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 ToO programs
Proposal
PI
ObsIDTarget Name
J2000 RA (deg)
J2000 Dec (deg)
Exposure (ks)
Comments
09029Kaya Mori80960303-15Polar WD in high accretion 13 x 20Multi-cycle ToO program
09029Kaya Mori80960301VV Pup123.778337-19.05493520Triggered 2023-06-08
09029Kaya Mori80960302V1033 Cen175.344731-64.17065520Triggered 2024-02-26
09108Reshmi Mukherjee80902634PKS 0446+1172.282 11.357 2 x 40Triggered 2024-01-10
Coordinated with Swift and VERITAS
09138Marina Orio80902337New Symbotic Nova 3 x 20Multi-cycle ToO program
09180Megumi Shidatsu80901338Disk-wind black hole binary 50Coordinated with XRISM
09235Aarran Shaw80902342GX 339-4255.70579-48.789752 x 20Triggered 2024-02-22
Coordinated with JWST
80902343Black hole LMXB 2 x 20Coordinated with JWST
10066Jennifer Sokoloski 81002321T CrB239.8756725.920172x20Coordinated with NICER
10087Gaurava Jaisawal810013224U 1820-30275.91904-30.3612845Coordinated with NICER
triggered 2024-07-02
10090Kaya Mori81001323GC X-RAY Transient 1 20
Multi-cycle ToO program
10090Kaya Mori81001324GC X-RAY Transient 2 20
10097Raffaella Margutti81002425Interacting SN 3x40Coordinated with Swift
10100Raffaella Margutti81002426Compact Object GW1 4x40
10100Raffaella Margutti81001427Compact Object GW2 40
10103Yuhan Yao81001628ZTF24aaoxmyb252.725603 32.876719 50Coordinated with Swift
Triggered 2024-07-01
10103Yuhan Yao81001629TDE2 50Coordinated with Swift
10112Qi Feng81002630Candidate Neutrino Blazar 2x40Coordinated with Swift & VERITAS
10134Riccardo Middei81001631MRK 421166.1137938.2088340Coordinated with IXPE ToO & MAGIC/VERITAS
Observe one of these targets
10134Riccardo Middei81001632MRK 501253.4675839.760170
10134Riccardo Middei810016331ES 0033+5958.96959.83450
10134Riccardo Middei810016341ES 1959+650299.9993865.14850
10134Riccardo Middei810016351ES 1218+304185.3414230.1770
10134Riccardo Middei810016361ES 1011+496153.7672549.433530
10171Jiachen Jiang81002337SWIFT J0243.6+612440.9184661.434393x20Coordinated with NICER
10182Dheeraj Pasham81002638Relativistic TDE 20+20+40Coordinated with NICER
10185Kirill Sokolovsky81002339New Nova 3x50
10191Mirko Krumpe81002640Changing look AGN 2x150Coordinated with XMM
10198Andrea Gokus81001641High-Z Blazar 100
10216Javier Garcia81002342BHB outburst monitoring 3x30 10x20 2x30 3x50Coordinated with NICER
10220Megumi Shidatsu81001343Low inclination Black Hole Binary 30Coordinated with XRISM & Swift

No XRISM ToO selected - program suspended
81001344High inclination Black Hole Binary 30
10245Guglielmo Mastroserio81002345GX 339-4255.70579-48.789753x20Coordinated with IXPE
10246Daniel Lawther81001646MRK 59033.63983-0.7667290Coordinated with XMM
Triggered 2024-06-29
10249Sean Pike81002347Unknown MAXI Source 1 2x20
10249Sean Pike81002348Unknown MAXI Source 2 2x20
10249Sean Pike81002349Unknown MAXI Source 3 2x20
10251Peter Kosec81002350Hercules X-1254.4575435.342362x20Coordinated with Chandra
Triggered 2024-08-15
10257Amruta Jaodand81002351X-BNS 100+75+75
10267Jon Miller81001652PG 1211+143183.5736214.0536780Coordinated with XRISM

No XRISM ToO selected - program suspended
81001653MRK 817219.09258.79428100
10268Benjamin Coughenour81001354Transient BH XRB 50Coordinated with NICER
10309Oluwashina Adegoke81002355Blackhole Binaries 3x25Coordinated with NICER
Joint NuSTAR/Chandra GO ToO programs
25400276Kosec81002301LMC/SMC ULX 3x20
25400338Neilsen81002302Black Hole Transient 4x25
25500335Margutti81002403AT2024qfm350.347753 11.942232 2x25 + 2x40Triggered 2024-08-01
26400066Peter Kosec81102301Magellanic Clouds ULX transient 3x20Chandra cycle-26 begins on 2026-01-01
26400115Kaya Mori81102302GC VFXT 2x20Chandra cycle-26 begins on 2026-01-01
26400240Joey Neilsen81102303Black hole state transition 4x25Chandra cycle-26 begins on 2026-01-01
26500151Raffaella Margutti81102404Interacting SN 2x50Chandra cycle-26 begins on 2026-01-01
Joint NuSTAR/XMM-Newton GO ToO programs
094004Norbert Schartel81001611RQ AGN outburst 150Coordinated with SALT or HET
094004Norbert Schartel81001612RQ AGN outburst 150Coordinated with SALT or HET
094084Rafaella Margutti81002513SNinteracting2x50
094134Erin Kara81001614Mrk 817219.09195858.79426960Coordinated with HST
094209Michael Nowak810013154U 1957+11299.85004211.70829420
094218Murray Brightman81001516NGC 4045 ULX180.6762081.96925100Coordinated with Swift monitoring
094376Samuel Barnier81002317BH XRB outburst10x20
094484Maxime Parra81002318BH LMXB outburst10x20Coordinated with Swift monitoring
Joint NuSTAR/INTEGRAL GO ToO programs
2140005Maria Teresa Fiocchi81001319Ultra-compact XRB25
2140012Ingo Kreykenbohm81001320Transient pulsar40
Joint NuSTAR/Swift GO ToO programs
1821098Kirill Sokolovsky80801310New Nova40
1821161Maria-Carla Nicotra80801311FRB120
1821161Maria-Carla Nicotra80801312FRB220
1922051Liliana Rivera Sandoval80902423Fast-evolving luminous transient3x20Swift cycle-19 begins on 2023-04-01
Joint NuSTAR/NICER GO ToO programs
06039Teruaki Enoto80902311Magnetar Outburst20+30+50Coordinated with DSN
06057Fiamma Capitanio809023124U 1630-47248.50671-47.393003x20 + 20Triggered 2023-03-07
Coordinated with IXPE
06057Fiamma Capitanio80902313SwiftJ1727.8-1613261.930583-16.2053224x20Triggered 2023-09-04
Coordinated with IXPE
06078Yuhan Yao80901615Tidal Disruption Event50
06113Adam Ingram80902316GRS 1915+105288.79816710.9458063x20 Coordinated with IXPE
06141Jingyi Wang80902317Transient BH Binary3x20
06143James Steiner80902318Cygnus X-1299.59033335.2016113x20 Coordinated with IXPE
Triggered 2023-04-07
06197Joseph Neilsen80901320GRS 1915+105288.79816710.94580625
06203Paul Draghis80901321SwiftJ1727.8-1613261.930583-16.20532230Triggered 2023-08-28
80901321BH transient #230
07041Alice Borghese81001304Magnetar outburst #1 20
07041Alice Borghese81001304Magnetar outburst #2 20
07082Teruaki Enoto810023061E 1841-045280.330596 -4.936433 20+30+50Triggered 2024-10-04
07126Gugleilmo Mastroserio81001307Black hole transient 50
07141Muryel Guolo81001608New TDE 50
07164Keigo Fukumura81002309MAXI J1810-222273.17-22.313x20
07170Edward Nathan81001310GRS1915+105288.79816710.94580630

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