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: 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	ObsID	Target Name	J2000 RA (deg)	J2000 Dec (deg)	Exposure (ks)	Comments
06238	Vestergaard	80602604	Mrk 590	33.63992	-0.76675	50+40+30	Joint with 3x25 ks XMM-Newton and 3x10 ks Swift observations Multi-cycle program Triggered 2021-12-17
07027	Krucker	80710201 to 209	The Sun	119.8876	20.5287	25	Coordinated with STIX on 2021-07-20
07027	Krucker	80711201	The Sun			25	Coordinated with STIX
07037	Brightman	80701507	NGC 4045 ULX	180.6765	1.96903	100	Coordinated with XMM-Newton
07052	Ballhausen	80701320	EXO 2030+375	308.063643	37.637456	50	Triggered 2021-08-23
07055	Jiang	80701321	Black hole transient			30
07070	Doroshenko	80702322	IXPE Transient X-Ray pulsar			10, 20, 30, 40, 50	Coordinated with IXPE
07072	Doroshenko	80702323	GK Persei	52.8	43.90428	3 x 30
07106	Margutti	80702508	SN2022ffg	153.450929	18.127325	2 x 50	Coordinated with XMM-Newton Triggered 2022-03-29
07112	Yao	80701509	AT2021ehb	46.9492547	40.3113484	40	Triggered 2021-11-15
07112	Yao	80701510	AT2022cmc	203.6800149	33.2167887	40	Triggered 2022-02-17
07113	Neilsen	80702324	V4641 Sgr	274.8401428	-25.4071803	5 x 20	Coordinated with NICER (5x10 ks) Triggered 2021-10-14
07114	Li	80701325	LAT-undetected Nova			60
07119	Borghese	80701326	1E 161348-5055	244.40096	-51.04017	75	Coordinated with XMM-Newton
07128	Xu	80701327	Black hole Hard State			60
07137	Ballhausen	80701328	Cep X4	324.87787	56.98622	100	Trigger on one of three possible targets
07137	Ballhausen	80701329	MXB 0656-072	104.57204	-7.20978
07137	Ballhausen	80701330	Low luminosity CRSF source
07164	McBride	80701610	IceCube-220303A	267.7157325	10.9488175	40	Triggered 2022-03-04
07164	McBride	80701611	ICECUBE2			40
07167	Tsuruta	80701331	SAX J1808.4-3658	272.11475	-36.97897	50
07179	Krumpe	80701612	EC 04570-5206	74.565	-52.034	100	Triggered 2022-05-25
07179	Krumpe	80701613	AGN flux drop2			100
07221	Somalwar	80702614	TC0052	307.6972094	4.225268866	3 x 20	Coordinated with Swift Triggered 2022-03-08
07259	Mehdipour	80701616	MRK 841	226.00487	10.43789	50	Triggered 2022-01-03
07266	Coughenour	80701332	MAXI J1803-298	270.76162	-29.83046	50	Triggered 2021-05-12
07277	Yao	80702511	FBOT			30 + 50
07286	Feng	80701621	PKS 0735+17	114.5308071	17.7052772	40	Triggered 2021-12-09
07302	Jaodand	80702333	Transitional ms pulsar			3 x 30	Coordinated with NICER
08003	Mori	80802325	GC X-ray Transient			2x20	Cycle-8 begins 2022-06-01
08033	Ballhausen	80801326	New CRSF source			50	Cycle-8 begins 2022-06-01
08041	Jiang	80801327	Black hole transient			30	Cycle-8 begins 2022-06-01
08079	Coughenour	80801328	Transient Black Hole XRB			50	Cycle-8 begins 2022-06-01 Coordinated with NICER
08107	Krucker	80802200	The SUN			2x25	Cycle-8 begins 2022-06-01
08110	Paliya	80801629	Swift-BAT blazar 1			20	Cycle-8 begins 2022-06-01
08110	Paliya	80801630	Swift-BAT blazar 2			20	Cycle-8 begins 2022-06-01
08115	Miller	80801631	Bright TDE			50	Cycle-8 begins 2022-06-01
08121	Mondal	80801332	FXT/VFXT			30	Cycle-8 begins 2022-06-01
08125	Jaisawal	80801333	4U 1820-30	275.91904	-30.36128	45	Cycle-8 begins 2022-06-01 Coordinated with NICER
08131	Krumpe	80801634	AGN flux drop			100	Cycle-8 begins 2022-06-01
08136	Sokolovsky	80801335	New Nova			60	Cycle-8 begins 2022-06-01
08166	Feng	80802636	Candidate Nu-Blazar			2x40	Cycle-8 begins 2022-06-01
08167	Krumpe	80801637	AGN-ignition 1			50	Cycle-8 begins 2022-06-01
08167	Krumpe	80801638	AGN ignition 2			50	Cycle-8 begins 2022-06-01
08171	McBride	80801639	ICECUBE 1			40	Cycle-8 begins 2022-06-01
08171	McBride	80801640	ICECUBE 2			40	Cycle-8 begins 2022-06-01
08201	Shaw	80801341	GX 339-4	255.70575	-48.78978	20	Cycle-8 begins 2022-06-01
08201	Shaw	80801342	Generic Black Hole LMXB			20	Cycle-8 begins 2022-06-01
08211	Arbet-Engels	80801643	BL Lac type transient			40	Cycle-8 begins 2022-06-01
08219	Draghis	80802344	Black hole transient 1			2x30	Cycle-8 begins 2022-06-01
08219	Draghis	80802345	Black hole transient 2			2x30	Cycle-8 begins 2022-06-01
08219	Draghis	80802346	Black hole transient 3			2x30	Cycle-8 begins 2022-06-01
08226	Pike	80802347	Unknown MAXI source 1			2x20	Cycle-8 begins 2022-06-01
08226	Pike	80802348	Unknown MAXI source 2			2x20	Cycle-8 begins 2022-06-01
08226	Pike	80802349	Unknown MAXI source 3			2x20	Cycle-8 begins 2022-06-01
08227	Arbet-Engels	80801650	1ES 2344+514 low state	356.77017	51.70497	20	Cycle-8 begins 2022-06-01
08227	Arbet-Engels	80801651	1ES 2344+514 high state	356.77017	51.70497	20	Cycle-8 begins 2022-06-01
08233	Lawther	80802652	Mrk 590	33.63992	-0.76675	20+20+60+50	Cycle-8 begins 2022-06-01 Coordinated with XMM-Newton & NICER
08234	Haemmerich	80801653	Flaring Blazar			50	Cycle-8 begins 2022-06-01 Coordinated with Gehrels-Swift
08236	Bonnoli	80801654	New VHE FSRQ			40	Cycle-8 begins 2022-06-01
08246	Jaodand	80802755	Binary NS merger afterglow			100+75+75	Cycle-8 begins 2022-06-01

Joint NuSTAR/Chandra GO ToO programs
21400516	K Mori	80602301	Galactic Center transient	tbd	tbd	2x20
22400400	K Mori	80702304	Galactic Center VFXT	tbd	tbd	2x20
22400529	M Bachetti	80701305	M82 X-2	148.962667	69.679303	80
22500172	P Scholz	80701506	FRB 20200120E	149.4850	68.8180	27	Triggered 2020-12-02 Coordinated with Effelsberg 100m
22500192	D Matthews	80701407	AT2020xnd (Fast Blue Optical Transient)	335.008458	-2.8403611	2x25, 2x40	Triggered 2020-10-26
23400247	Neilsen	80802303	Black Hole Transient			4 x 25
23500541	Chornock	80802504	Intereacting SN			2 x 50

Joint NuSTAR/XMM-Newton GO ToO programs
078214	Felix Fuerst	80201011	BH ToO			40	Coordinated with 10 x 2 ks Swift observations. Program extended into cycle-17
078430	Nanda Rea	80202013	XTE J1810-197	272.46	-19.731	20+30+40+80	Observations to be obtained over ~3 months. Triggered 2018-12-20
082145	Alessandro Papitto	80401306	ms pulsar			60
082359	Nanda Rea	80402308	Swift J1818.0-1607	274.5009167	-16.1311944	20,30,40,80	Triggered 2020-03-20
084079	Fiona Harrison	80501303	BH hard state			40
084080	Norbert Schartel	80502606	NGC 1566	65.00167	-54.9378056	50	Triggered 2019-05-30
084080	Norbert Schartel	80502607	IRAS 23226-3843	351.350833	-38.446944	50	Triggered 2019-10-16
084355	Raffaella Margutti	80502405	AT2018cow	244.001004	22.268024	2x25 + 2x40	Triggered 2022-02-07 (single 130 ks exposure)
084377	Norbert Schartel	80501606	AGN minimum			80
084434	Jelle Kaastra	80502609	NGC 3227	155.8775	19.8650	2x25	Triggered 2019-11-11
084469	Jian Li	80501608	muon track neutrino			40
084526	Luigi Piro	80501609	GW event			150
084545	James Court	80502310	GRO J1744-28	266.137875	-28.740833	80
086127	Allesandro Papitto	80601304	transitional ms pulsar			60
086276	Hannah Earnshaw	8061305	NGC 925 ULX-3	36.864583	33.570278	100	Triggered 2020-08-11
086342	Raffaella Margutti	80602406	SN2019yvr	191.28389	-0.45909	2x50	Triggered 2020-06-18
086403	Jennifer Sokoloski	80602307	T CrB	239.875667	25.920167	50	Triggered 2020-08-27
086460	Nanda Rea	80602315	PSR J1846-0258	281.60391667	-2.97502778	23,30,40,80	Triggered 2020-08-02
088008	Norbert Schartel	80701608	AGN outburst			2x50	Coordinated with SALT or HET
088054	Pierre-Olivier Petrucci	80702310	BH LMXB			10x20
088218	Nanda Rea	80702311	Magnetar outburst
088470	Alessandro Papitto	80701312	accreting ms pulsar			120	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
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	BH transient			40
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

Joint NuSTAR/INTEGRAL GO ToO programs
1740029	Riccardo La Placa	80601314	Millisecond X-ray pulsar			30	Also coordinated with XMM-Newton
1740033	Julia Alfonso-Garzon	80501302	H 1145-619	177.000083	-62.2069167	25	Also coordinated with Swift
1840002	Thomas Siegert	80701501	NS merger			100
1840005	Zhaosheng Li	80701302	Accreting 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

Joint NuSTAR/Swift GO ToO programs
1619112	Luigi Piro	80601509	FRB201124	77.0125	26.0606	20	Fast Radio burst
1619112	Luigi Piro	80601510	Fast Radio burst 2	tbd	tbd	20
1619139	Liliana Sandoval	80602511	Fast-Evolving Luminous Transient	tbd	tbd	3x20
1821098	Kirill Sokolovsky	80801310	New Nova			40
1821161	Maria-Carla Nicotra	80801311	FRB1			20
1821161	Maria-Carla Nicotra	80801312	FRB2			20

Joint NuSTAR/NICER GO ToO programs
04163	Jeroen Homan	80702318	4U 1820-30	275.91904	-30.361278	3x20	Triggered 2021-06-12
05001	Fiamma Capitanio	80802313	Transient XRB-1			2x30 + 20	Coordinated with IXPE
05001	Fiamma Capitanio	80802314	Transient XRB-2			2x30 + 20	Coordinated with IXPE
05001	Fiamma Capitanio	80802315	Transient XRB-3			2x30 + 20	Coordinated with IXPE
05065	Riley Connors	80802316	Transient BH Binary			4x20
05076	Teruaki Enoto	80802317	Magnetar Outburst			20+30+50	Coordinated with DSN
05079	Alice Borghese	80801318	Magnetar Outburst-1			20
05079	Alice Borghese	80801319	Magnetar Outburst-2			20
05099	Federico Garcia	80802320	BH transient			3x20
05106	Filippo D'Ammando	80801605	Blazar			40
05118	Jingyi Wang	80802321	IGR J17091-3624	257.2833	-36.4067	3x20	Triggered 2022-04-12
05131	Joseph Neilsen	80801322	GRS 1915+105	288.798167	10.945806	25
05140	Guglielmo Mastroserio	80801323	BH transient			50
05172	Javier Garcia	80801324	BHB			100

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

NuSTAR Main Site

www.nustar.caltech.edu