NuSTAR ToO targets approved within the NuSTAR, Chandra, XMM-Newton, Swift, NICER, and IXPE General Observer programs
NuSTAR Target of Opportunity (ToO) observations may be proposed for in the NuSTAR, Chandra, XMM-Newton, Neil Gehrels Swift Observatory, NICER, and IXPE General Observer (GO) programs.
A list of proposals selected for the joint NuSTAR/INTEGRAL General Observer (GO) program can be found here.
Last update: 2025-06-11
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 | ObsID | Target Name | Comments | ||||
| 10097 | Raffaella Margutti | 81002425 | SN2005mvn | 198.3661708 | 36.5865861 | 3x40 | Coordinated with SwiftTriggered 2025-06-04 |
| 10216 | Javier Garcia | 81002343 | 4U 1630-472 | 248.506708 | -47.3930 | 3x30 10x20 2x30 3x50 | Coordinated with NICERTriggered 2025-04-07 |
| 10309 | Oluwashina Adegoke | 81002355 | 4U 1630-472 | 248.506708 | -47.3930 | 3x25 | Coordinated with NICERTriggered 2025-04-07 |
| 11016 | Murray Brightman | 81101525 | TRANSIENT ULX | 0 | 0 | 50 | Coordinated with XMM-Newton |
| 11046 | Qi Feng | 81102626 | CANDIDATE NU BLAZAR | 0 | 0 | 2x40 | Coordinated with Swift & VERITAS |
| 11086 | Dheeraj Pasham | 81102627 | JETTED TDE | 0 | 0 | 2x20 + 40 | Coordinated with NICER |
| 11118 | Shifra Mandel | 81102328 | GC X-RAY TRANSIENT | 0 | 0 | 2x20 | |
| 11129 | Dheeraj Pasham | 81101629 | ICECUBEGOLD | 0 | 0 | 50 | |
| 11131 | Vittoria Gianolli | 81101630 | NGC4151 | 182.63575 | 39.40586 | 30 | Coordinated with XMM-Newton and Swift |
| 11133 | Yuexin Zhang | 81102331 | GX 339m4 | 255.70579 | -48.78975 | 3x20 | Coordinated with NICER |
| 11135 | Jennifer Sokoloski | 81102332 | T CrB | 239.87567 | 25.92017 | 2x20 | Coordinated with NICER |
| 11139 | Ole Koenig | 81101333 | LMXB BH | 0 | 0 | 100 | |
| 11140 | Marina Orio | 81102334 | NEW SYMBIOTIC NOVA | 0 | 0 | 20+20 | Coordinated with XMM-Newton |
| 11149 | Amruta Jaodand | 81102735 | X-BNS | 0 | 0 | 100+75+75 | |
| 11158 | Mischa Breuhaus | 81101636 | KM3NET BLAZAR | 0 | 0 | 35 | Coordinated with XMM-Newton |
| 11165 | Yuexin Zhang | 81102337 | GRS 1915p105 | 288.79817 | 10.94581 | 2x20 | Coordinated with NICER IXPE and VLA |
| 11173 | Dominic Walton | 81102338 | NGC5907 ULX1 | 228.99417 | 56.30278 | 2x100 | Coordinated with XMM-Newton |
| 11181 | Jon Miller | 81101639 | MARKARIAN 817 | 219.092 | 58.79428 | 100 | |
| 81101640 | PG 1211p143 | 183.57362 | 14.05367 | 80 | |||
| 11187 | Alice Borghese | 81102341 | Magnetar outburst | 0 | 0 | 30+60+80 | |
| 11193 | Xiurui Zhao | 81102642 | MRK 509 | 311.04063 | -10.72353 | 20+20 | Coordinated with Swift |
| 81102643 | 1H0419m577 | 66.503 | -57.2005 | 40+20 | Coordinated with Swift | ||
| 11203 | Kaya Mori | 81101344 | Long Period Radio Transient | 0 | 0 | 80 | Coordinated with XMM-Newton and Swift |
| 11209 | Alessio Marino | 81101345 | EP250623a | 257.9974 | 257.9974 | 50 | Coordinated with NICER or EP-FXT |
| 81101346 | Faint EP LMXB 2 | 0 | 0 | 50 | Coordinated with NICER or EP-FXT | ||
| 11219 | Federico Vincentelli | 81160301 | LMXB 1 | 0 | 0 | 20 | Coordinated with NICER and VLT |
| 81160302 | LMXB 2 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160303 | LMXB 3 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160304 | LMXB 4 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160305 | LMXB 5 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160306 | LMXB 6 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160307 | LMXB 7 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 81160308 | LMXB 8 | 0 | 0 | 20 | Coordinated with NICER and VLT | ||
| 11258 | Daniel Lawther | 81101647 | MRK590 | 33.63983 | -0.76672 | 50 | Coordinated with XMM-Newton |
| 11266 | Lea Marcotulli | 81101648 | VHE gamma-ray source | 0 | 0 | 180 | Coordinated with XMM-Newton |
| 11282 | Dheeraj Pasham | 81102349 | EP250702a | 284.6897 | -7.8748 | 2x20 | Triggered 2025-07-03 |
| 11286 | Mason Ng | 81102350 | HIGH B RPP | 0 | 0 | 3x50 | |
| 11287 | Benjamin Coughenour | 81101351 | TRANSIENT BH XRB | 0 | 0 | 50 | Coordinated with NICER |
| 11304 | Christian Malacaria | 81101352 | New EP pulsar 1 | 0 | 0 | 50 | Coordinated with NICER |
| 81101353 | New EP pulsar 2 | 0 | 0 | 50 | Coordinated with NICER | ||
| 11310 | Edward Nathan | 81101354 | H1743m322 | 266.565 | -32.23358 | 50 | Coordinated with NICER |
| 81101355 | A BRIGHT XRB | 0 | 0 | 0 | Coordinated with NICER | ||
| Joint NuSTAR/Chandra GO ToO programs | |||||||
| 25400276 | Kosec | 81002301 | LMC/SMC ULX | 3x20 | |||
| 25400338 | Neilsen | 81002302 | Black Hole Transient | 4x25 | |||
| 25500335 | Margutti | 81002403 | AT2024qfm | 350.347753 | 11.942232 | 2x25 + 2x40 | Triggered 2024-08-01 |
| 26400066 | Peter Kosec | 81102301 | Magellanic Clouds ULX transient | 3x20 | |||
| 26400115 | Kaya Mori | 81102302 | MAXI J1744-294 | 266.424708 | -29.009722 | 2x20 | Triggered 2025-02-03 |
| 26400240 | Joey Neilsen | 81102303 | 4U 1630-472 | 248.506708 | -47.3930 | 4x25 | Triggered 2025-04-07 |
| 26500151 | Raffaella Margutti | 81102404 | Interacting SN | 2x50 | |||
| Joint NuSTAR/XMM-Newton GO ToO programs | |||||||
| 090022 | Norbert Schartel | 80801601 | PG 1149-110 | 178.014789 | -11.373359 | 80 | Triggered 2024-12-09 |
| 80801602 | RX J0134.7-0430 | 23.689583 | -4.503597 | 80 | Triggered 2024-12-05 | ||
| 090332 | Rafaella Margutti | 80802406 | AT2024wpp | 40.522853 | -16.956397 | 2x25+2x40 | Triggered 2024-11-14 |
| 094004 | Norbert Schartel | 81001611 | RQ AGN outburst 1 | 50 | Coordinated with SALT or HET | ||
| 094004 | Norbert Schartel | 81001612 | RQ AGN outburst 1 | 50 | Coordinated with SALT or HET | ||
| 094084 | Rafaella Margutti | 81002513 | SNinteracting | 2x50 | |||
| 094134 | Erin Kara | 81001614 | Mrk 817 | 219.091958 | 58.794269 | 60 | Coordinated with HST |
| 094209 | Michael Nowak | 81001315 | 4U 1957+11 | 299.850042 | 11.708294 | 20 | |
| 094218 | Murray Brightman | 81001516 | NGC 4045 ULX | 180.676208 | 1.96925 | 100 | Coordinated with Swift monitoring |
| 094376 | Samuel Barnier | 81002317 | BH XRB outburst | 10x20 | |||
| 094484 | Maxime Parra | 81002318 | BH LMXB outburst | 10x20 | Coordinated with Swift monitoring | ||
| 096056 | Raffaella Margutti | 81102409 | FBOT1 | 2x25, 2x40 | Cycle-24 observations begin 2025-05-01 | ||
| 096105 | Arianna Miraval-Zanon | 81101310 | ms pulsar | 60 | Coordinated with NRAO/GBOCycle-24 observations begin 2025-05-01 | ||
| 096132 | Alessandro Papitto | 81101311 | accreting ms pulsar | 110 | Coordinated with IXPECycle-24 observations begin 2025-05-01 | ||
| 096133 | Sergio Campana | 81101512 | GW counterpart NS merger | 60 | Coordinated with HST and NRAOCycle-24 observations begin 2025-05-01 | ||
| 096346 | Nanda Rea | 81102313 | magnetar outburst | 60, 100 | Cycle-24 observations begin 2025-05-01 | ||
| 096405 | Eleonora Troja | 81101514 | GW afterglow | 150 | Cycle-24 observations begin 2025-05-01 | ||
| Joint NuSTAR/Swift GO ToO programs | |||||||
| 1821098 | Kirill Sokolovsky | 80801310 | New Nova | 40 | |||
| 1821161 | Maria-Carla Nicotra | 80801311 | FRB1 | 20 | |||
| 1821161 | Maria-Carla Nicotra | 80801312 | FRB2 | 20 | |||
| 1922051 | Liliana Rivera Sandoval | 80902423 | Fast-evolving luminous transient | 3x20 | |||
| Joint NuSTAR/NICER GO ToO programs | |||||||
| 08005 | Teruaki Enoto | 81102315 | MAGNETAR OUTBURST | 20+30+50 | NICER cycle-7 observations begin in 2025 March | ||
| 08079 | Joseph Neilsen | 81101316 | GRS 1915+105 | 288.798167 | 10.945806 | 25 | NICER cycle-7 observations begin in 2025 March |
| 08110 | Alice Borghese | 81101317 | Magnetar outburst #1 | 20 | NICER cycle-7 observations begin in 2025 March | ||
| 08110 | Alice Borghese | 81101318 | Magnetar outburst #2 | 20 | NICER cycle-7 observations begin in 2025 March | ||
| 08149 | Paul Draghis | 81101319 | BH outburst #1 | 30 | NICER cycle-7 observations begin in 2025 March | ||
| 08149 | Paul Draghis | 81101320 | BH outburst #2 | 30 | NICER cycle-7 observations begin in 2025 March | ||
| 08165 | Riley Connors | 81101321 | Black Hole Binary | 4x20 | NICER cycle-7 observations begin in 2025 March | ||
| 08172 | Oluwashina Adegoke | 81101322 | Black Hole Binaries | 6x20 | NICER cycle-7 observations begin in 2025 March | ||
| 08186 | Edward Nathan | 81101323 | GRS 1915+105 | 288.798167 | 10.945806 | 30 | NICER cycle-7 observations begin in 2025 March |
| Joint NuSTAR/IXPE GO ToO programs | |||||||
| 02036 | Svetlana Jorstad | 81101605 | LSP/ISP BLAZAR | 20 | Coordinated with Swift | ||
| 02151 | James Steiner | 81102306 | H1743-322 | 266.565 | -32.23358 | 2x20 | Coordinated with NICER |
| 02156 | Yash Bhargava | 81102307 | AQL X-1 | 287.81692 | 0.58497 | 2x20 | Coordinated with NICER |
| 02191 | Maxime Parra | 81101308 | Wind Emitting BH-LMXB | 20 | Coordinated with NICER | ||