NuSTAR SOC - ToO programs

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: 2024-04-22
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	ObsID	Target Name	J2000 RA (deg)	J2000 Dec (deg)	Exposure (ks)	Comments
08166	Feng	80802636	B3 2247+381	342.524	38.410	2x40	Triggered 2022-09-24 Coordinated with Swift & VERITAS
08233	Daniel Lawther	80802652	Mrk 590	33.63992	-0.76675	20+20+60+50	Triggered 2023-09-25 Multi-cycle ToO program Coordinated with XMM-Newton or NICER
09029	Kaya Mori	80960303-15	Polar WD in high accretion			13 x 20	Multi-cycle ToO program
09029	Kaya Mori	80960301	VV Pup	123.778337	-19.054935	20	Triggered 2023-06-08
09029	Kaya Mori	80960302	V1033 Cen	175.344731	-64.170655	20	Triggered 2024-02-26
09047	Mariko Kimura	80902330	SS Cyg	325.67833	43.58608	100 + 30	Coordinated with XRISM
09050	Sam Krucker	80910201	The Sun			2 x 25
09085	Sibasish Laha	80902632	1ES 1927+654	291.831208	65.565103	4 x 40	Triggered 2023-05-22 Coordinated with NICER
09094	Joseph Neilsen	80902333	Swift J1727.8-1613	261.930583	-16.205322	5 x 20	Triggered 2023-08-27 Coordinated with NICER
09108	Reshmi Mukherjee	80902634	PKS 0446+11	72.282	11.357	2 x 40	Triggered 2024-01-10 Coordinated with Swift and VERITAS
09109	Dheeraj Pasham	80902635	Relativistic TDE			2x20 + 40	Coordinated with NICER
09124	Amruta Jaodand	80902336	Binary neutron star merger			100 + 2x75
09138	Marina Orio	80902337	New Symbotic Nova			3 x 20
09180	Megumi Shidatsu	80901338	Disk-wind black hole binary			50	Coordinated with XRISM
09191	Svetlana Jorstad	80901639	BL Lac	330.680380	42.277772	20	Coordinated with Gehrels-Swift and IXPE
09191	Svetlana Jorstad	80901640	Flaring blazar 2			20	Coordinated with Gehrels-Swift and IXPE
09198	Kirill Sokolovsky	80901341	PNV J17261813-3809354	261.5755417	-38.1598333	60	Triggered 2024-02-09 Joint XMM-Newton observation
09235	Aarran Shaw	80902342	GX 339-4	255.70579	-48.78975	2 x 20	Triggered 2024-02-22 Coordinated with JWST
09235	Aarran Shaw	80902343	Black hole LMXB			2 x 20	Coordinated with JWST
09251	Koji Mukai	80901344	T CrB	239.87567	25.92017	40	Coordinated with XRISM
09257	Sean Pike	80911301	Unknown MAXI source 1			2 x 20
		80912301	Unknown MAXI source 2			2 x 20
		80913301	Unknown MAXI source 3			2 x 20
09271	Jennifer Sokoloski	80902345	T CrB	239.87567	25.92017	2 x 20	Coordinated with NICER
09274	Oluwashina Adegoke	80902346	4U 1630-472	248.50670833	-47.39300	3 x 25	Triggered 2024-01-04 Coordinated with NICER
09276	Javier Garcia	80901347	Swift J151857.0-572147	229.7375	-57.3633	30	Coordinated with NICER Triggered 2024-03-04
09289	James Steiner	80902348	SwiftJ1727.8-1613	261.930583	-16.205322	4 x 20	Coordinated with NICER Triggered 2023-10-16
10066	Jennifer Sokoloski	81002321	T CrB	239.87567	25.92017	2x20	Coordinated with NICER Cycle-10 begins on 2024-06-01
10087	Gaurava Jaisawal	81001322	4U 1820-30	275.91904	-30.36128	45	Coordinated with NICER Cycle-10 begins on 2024-06-01
10090	Kaya Mori	81001323	GC X-RAY Transient 1			20	Cycle-10 begins on 2024-06-01
10090	Kaya Mori	81001324	GC X-RAY Transient 2			20	Cycle-10 begins on 2024-06-01
10097	Raffaella Margutti	81002425	Interacting SN			3x40	Coordinated with Swift Cycle-10 begins on 2024-06-01
10100	Raffaella Margutti	81002426	Compact Object GW1			4x40	Cycle-10 begins on 2024-06-01
10100	Raffaella Margutti	81001427	Compact Object GW2			40	Cycle-10 begins on 2024-06-01
10103	Yuhan Yao	81001628	TDE1			50	Coordinated with Swift Cycle-10 begins on 2024-06-01
10103	Yuhan Yao	81001629	TDE2			50	Coordinated with Swift Cycle-10 begins on 2024-06-01
10112	Qi Feng	81002630	Candidate Neutrino Blazar			2x40	Coordinated with Swift & VERITAS Cycle-10 begins on 2024-06-01
10134	Riccardo Middei	81001631	MRK 421	166.11379	38.20883	40	Coordinated with IXPE ToO & MAGIC/VERITAS Observe one of these targets Cycle-10 begins on 2024-06-01
10134	Riccardo Middei	81001632	MRK 501	253.46758	39.76017	0
10134	Riccardo Middei	81001633	1ES 0033+595	8.969	59.8345	0
10134	Riccardo Middei	81001634	1ES 1959+650	299.99938	65.1485	0
10134	Riccardo Middei	81001635	1ES 1218+304	185.34142	30.177	0
10134	Riccardo Middei	81001636	1ES 1011+496	153.76725	49.43353	0
10171	Jiachen Jiang	81002337	SWIFT J0243.6+6124	40.91846	61.43439	3x20	Coordinated with NICER Cycle-10 begins on 2024-06-01
10182	Dheeraj Pasham	81002638	Relativistic TDE			20+20+40	Coordinated with NICER Cycle-10 begins on 2024-06-01
10185	Kirill Sokolovsky	81002339	New Nova			3x50	Cycle-10 begins on 2024-06-01
10191	Mirko Krumpe	81002640	Changing look AGN			2x150	Coordinated with XMM Cycle-10 begins on 2024-06-01
10198	Andrea Gokus	81001641	High-Z Blazar			100	Cycle-10 begins on 2024-06-01
10216	Javier Garcia	81002342	BHB outburst monitoring			3x30 10x20 2x30 3x50	Coordinated with NICER Cycle-10 begins on 2024-06-01
10220	Megumi Shidatsu	81001343	Low inclination Black Hole Binary			30	Coordinated with XRISM & Swift Cycle-10 begins on 2024-06-01
10220	Megumi Shidatsu	81001344	High inclination Black Hole Binary			30	Coordinated with XRISM & Swift Cycle-10 begins on 2024-06-01
10245	Guglielmo Mastroserio	81002345	GX 339-4	255.70579	-48.78975	3x20	Coordinated with IXPE Cycle-10 begins on 2024-06-01
10246	Daniel Lawther	81001646	MRK 590	33.63983	-0.76672	90	Coordinated with XMM Cycle-10 begins on 2024-06-01
10249	Sean Pike	81002347	Unknown MAXI Source 1			2x20	Cycle-10 begins on 2024-06-01
10249	Sean Pike	81002348	Unknown MAXI Source 2			2x20	Cycle-10 begins on 2024-06-01
10249	Sean Pike	81002349	Unknown MAXI Source 3			2x20	Cycle-10 begins on 2024-06-01
10251	Peter Kosec	81002350	Hercules X-1	254.45754	35.34236	2x20	Coordinated with Chandra Cycle-10 begins on 2024-06-01
10257	Amruta Jaodand	81002351	X-BNS			100+75+75	Cycle-10 begins on 2024-06-01
10267	Jon Miller	81001652	PG 1211+143	183.57362	14.05367	80	Coordinated with XRISM Cycle-10 begins on 2024-06-01
10267	Jon Miller	81001653	MRK 817	219.092	58.79428	100	Coordinated with XRISM Cycle-10 begins on 2024-06-01
10268	Benjamin Coughenour	81001354	Transient BH XRB			50	Coordinated with NICER Cycle-10 begins on 2024-06-01
10309	Oluwashina Adegoke	81002355	Blackhole Binaries			3x25	Coordinated with NICER Cycle-10 begins on 2024-06-01

Joint NuSTAR/Chandra GO ToO programs
23400247	Neilsen	80802303	Black Hole Transient			4 x 25
23500541	Chornock	80802504	SN2012ap	75.057167	-3.347560	2 x 50	Triggered 2022-12-28
24400072	Mori	80902301	GC transient			2x20
24400242	Neilsen	80902302	Black Hole transient			4x25
24500203	Brethauer	80902503	SN2022xxf	172.524751	9.282604	2x50	Triggered 2023-04-24
24500280	Matthews	80902404	AT2022tsd	50.045282	8.748878	2x25,2x40	Triggered 2022-10-07
25400276	Kosec	81002301	LMC/SMC ULX			3x20	Cycle-25 begins 2024-01-01
25400338	Neilsen	81002302	Black Hole Transient			4x25	Cycle-25 begins 2024-01-01
25500335	Margutti	81002403	FBOT			2x25 + 2x40	Cycle-25 begins 2024-01-01

Joint NuSTAR/XMM-Newton GO ToO programs
086127	Allesandro Papitto	80601304	Terzan 5	267.02083	-24.7800	60	Triggered 2023-03-01
088008	Norbert Schartel	80701608	RX J0128.1-1848	22.0280	-18.808625	50	Triggered 2022-11-29 Coordinated with SALT or HET
088008	Norbert Schartel	80701609	AGN outburst 2			50	Coordinated with SALT or HET
088054	Pierre-Olivier Petrucci	80702310	Swift J1727.8-1613	261.930583	-16.205322	10x20	Triggered 2023-08-29
088218	Nanda Rea	80702311	SGR J1935+2154	293.7320	21.896720	50+40+80	Triggered 2022-10-17
088470	Alessandro Papitto	80701312	SAX J1808.4-3658	272.114750	-36.978970	120	Triggered 2022-08-20 Coordinated with IXPE
090022	Norbert Schartel	80801601	AGN Minimum 1			80	Coordinated with HST
090022	Norbert Schartel	80801602	AGN Minimum 2			80	Coordinated with HST
090023	Norbert Schartel	80801603	PG 0043+039	11.446792	4.173156	60	Coordinated with HST and HET/SALT Triggered 2022-06-16
090067	Adam Ingram	80802309	GRS 1915+105	288.798125	10.945778	3x30	Coordinated with IXPE
090245	Missagh Mehdipour	80801604	AGN obscuration			30	Coordinated with HST
090251	Daniel Stern	80860601	eROSITA-fader1			20
		80860602	eROSITA-fader6			20
		80860603	eROSITA-fader6			20
		80860604	eROSITA-fader6			20
		80860605	eROSITA-fader6			20
		80860606	eROSITA-fader6			20
090284	Javier Garcia	80801305	Swift J1727.8-1613	261.94167	-16.214719	40	Triggered 2024-03-15
090332	David Matthews	80802406	FBOT			2x25+2x40
090357	Sergio Campana	80801507	GW counterpart1			60	Coordinated with HST and NRAO
090357	Sergio Campana	80801508	GW counterpart2			60
092118	Raffaella Margutti	80902505	SN2023ixf	210.910667	54.311675	2x50	Triggered 2023-06-04
092270	Elias Kammoun	80902606	SMSS J114447.77-430859.3	176.199	-43.14984	2x80	Triggered 2023-06-15
092317	Alessandro Papitto	80901307	SRGA J144459.2-604207	221.248375	-60.697972	120	Coordinated with IXPE Triggered 2024-02-23
092331	Missagh Mehdipour	80901608	NGC 3516	166.697763	72.56869	60	Coordinated with HST Triggered 2023-04-23
092346	Arianna Miraval Zanon	80901309	3FGL J1544.6-1125	236.164083	-11.467861	60	Triggered 2024-01-30 Coordinated with GTC/HiPERCAM
092410	Erin Kara	80901610	Mrk 817	219.09200858	58.7942763	60	Coordinated with HST Triggered 2023_04-24
094004	Norbert Schartel	81001611	RQ AGN outburst 1			50	Coordinated with SALT or HET Cycle-23 begins 2024-05-01
094004	Norbert Schartel	81001612	RQ AGN outburst 1			50	Coordinated with SALT or HET Cycle-23 begins 2024-05-01
094084	Rafaella Margutti	81002513	SNinteracting			2x50	Cycle-23 begins 2024-05-01
094134	Erin Kara	81001614	Mrk 817	219.091958	58.794269	60	Coordinated with HST Cycle-23 begins 2024-05-01
094209	Michael Nowak	81001315	4U 1957+11	299.850042	11.708294	20	Cycle-23 begins 2024-05-01
094218	Murray Brightman	81001516	NGC 4045 ULX	180.676208	1.96925	100	Coordinated with Swift monitoring Cycle-23 begins 2024-05-01
094376	Samuel Barnier	81002317	BH XRB outburst			10x20	Cycle-23 begins 2024-05-01
094484	Maxime Parra	81002318	BH LMXB outburst			10x20	Coordinated with Swift monitoring Cycle-23 begins 2024-05-01

Joint NuSTAR/INTEGRAL GO ToO programs
1840002	Thomas Siegert	80701501	NS merger			100
1840005	Zhaosheng Li	80701302	ms pulsar			30	Also coordinated with XMM-Newton, NICER, and HXMT
1840021	Ingo Kreykenbohm	80701303	Accreting X-ray pulsar			40
1940020	Ingo Kreykenbohm	80801301	Transient accreting pulsar			40
1940025	Thomas Siegert	80801502	GW Neutron star merger			100
2040002	Thomas Siegert	80901324	NS merger			100
2040026	Maria Teresa Fiocchi	80901325	Ultracompact XRB in outburst			25
2140005	Maria Teresa Fiocchi	81001319	Ultra-compact XRB			25	Cycle-21 begins 2024-01-01
2140012	Ingo Kreykenbohm	81001320	Transient pulsar			40	Cycle-21 begins 2024-01-01

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	Swift cycle-19 begins on 2023-04-01

Joint NuSTAR/NICER GO ToO programs
05099	Federico Garcia	80802320	GX 339-4	255.705754	-48.78975	3x20	Triggered 2022-08-30
06039	Teruaki Enoto	80902311	Magnetar Outburst			20+30+50	Coordinated with DSN
06057	Fiamma Capitanio	80902312	4U 1630-47	248.50671	-47.39300	3x20 + 20	Triggered 2023-03-07 Coordinated with IXPE
06057	Fiamma Capitanio	80902313	SwiftJ1727.8-1613	261.930583	-16.205322	4x20	Triggered 2023-09-04 Coordinated with IXPE
06078	Yuhan Yao	80901615	Tidal Disruption Event			50
06113	Adam Ingram	80902316	GRS 1915+105	288.798167	10.945806	3x20	Coordinated with IXPE
06141	Jingyi Wang	80902317	Transient BH Binary			3x20
06143	James Steiner	80902318	Cygnus X-1	299.590333	35.201611	3x20	Coordinated with IXPE Triggered 2023-04-07
06197	Joseph Neilsen	80901320	GRS 1915+105	288.798167	10.945806	25
06203	Paul Draghis	80901321	SwiftJ1727.8-1613	261.930583	-16.205322	30	Triggered 2023-08-28
06203	Paul Draghis	80901321	BH transient #2			30
07041	Alice Borghese	81001304	Magnetar outburst #1			20	Cycle-6 begins on 2024-03-01
07041	Alice Borghese	81001304	Magnetar outburst #2			20	Cycle-6 begins on 2024-03-01
07082	Teruaki Enoto	81002306	Magnetar outburst			20+30+50	Cycle-6 begins on 2024-03-01
07126	Gugleilmo Mastroserio	81001307	Black hole transient			50	Cycle-6 begins on 2024-03-01
07141	Muryel Guolo	81001608	New TDE			50	Cycle-6 begins on 2024-03-01
07164	Keigo Fukumura	81002309	MAXI J1810-222	273.17	-22.31	3x20	Cycle-6 begins on 2024-03-01
07170	Edward Nathan	81001310	GRS1915+105	288.798167	10.945806	30	Cycle-6 begins on 2024-03-01

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

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