XMM-Newton Target of Opportunity (ToO)

ToO Policies & Procedures

Targets of Opportunity (ToOs) are subject to the policies and procedures explained in the XMM-Newton Policies & Procedures Document which is available here.
Please, pay particular attention to Section 5.2.2 and especially Subsection 5.2.2.2, which makes reference to unanticipated ToO alerts explaining also the policy for the determination of proprietary periods of such observations.

"Discretionary Time” may be granted for programmes where a timely observation (outside of the normal announcement of opportunity cycle) is likely to result in a significant scientific impact.

ToO Alert

Investigators may notify the XMM-Newton SOC of a Target of Opportunity online. Simply complete the details on the ToO Notification Page.

Pending Anticipated ToOs

A list of anticipated ToO observations already accepted by the XMM-Newton Observing Time Allocation Committee (OTAC), which are currently not yet fulfilled, is available at this link.

Unanticipated ToO Details

The following list comprises approved and performed unanticipated ToOs.

The status of the data is denoted using the following acronyms:

ToO (public): Target of Opportunity data are public with respect to data-rights
ToO (DD-MMM-YYYY): Target of Opportunity data are public after the given date, usually after a proprietary period of half a year. Dates can also be linked to data-rights of another accepted open-time target, or be decided by the Project Scientist
ToO (TBD): Target of Opportunity data rights are granted, but the date for the observation to be public is still undefined. Either the ODF has not been delivered yet, or the data rights depend on another observation
DPS: Observed in Discretionary Time of the Project Scientist

The links from entries in this table are as follows:

Rev: link to the Orbit/Date Calculator, to check the observation date
Observation Id: link to the corresponding entry in the Observation Log, if already scheduled. If an observation is not yet listed, the scheduling is still to be confirmed
ODF Data: link to the ODF data for download from the XSA archive, when available (the typical production time for an ODF is approximately 2 weeks). If the data is still proprietary, the linked page will indicate this
PPS Data: link to the PPS data for download from the XSA archive, when available (the typical production time for PPS Data is approximately 6 weeks). If the data is still proprietary, the linked page will indicate this

This table is weekly updated, but there might be periods for which updates take slightly longer. Should you need to know details about a ToO/DPS observation, that are not given below (yet), please do not hesitate to contact the HelpDesk.

Rev Observation
Id Target RA Dec Exp. Time
(ksec) Data Status ODF Data
when available PPS Data
when available Proposer/
Comments

4899 0992191001 SAX J1748.9-2021 17:48:52.20 -20:21:32.4 34.0 ToO (TBD) ODF Data PPS Data (Dr. G. Illiano)

4898 0992190601 LS I +61 303 02:40:31.60 +61:13:45.5 15.4 ToO (TBD) ODF Data PPS Data (Dr. M. Chernyakova)

4897 0992190501 LS I +61 303 02:40:31.60 +61:13:45.5 18.2 ToO (TBD) ODF Data PPS Data (Dr. M. Chernyakova)

4897 0991802701 AT2021aeuk 16:12:59.80 +42:19:40.1 30.0 ToO (TBD) ODF Data PPS Data (Dr. J. Sun)

4894 0992190901 4U 1700+24 17:06:34.50 +23:58:18.5 37.3 ToO (TBD) ODF Data PPS Data (Dr. S. Guillot)

4875 0992190401 SN2007it 14:18:25.60 -43:22:53.7 27.8 ToO (28-Jan-2027) ODF Data PPS Data (Dr. R. Brose)

4867 0991802501 ZTF19acnskyy 13:35:19.90 +07:28:07.7 119.8 ToO (13-Jan-2027) ODF Data PPS Data (Dr. H. Guo)

4866 0991802401 AT2022czy 12:22:01.10 +16:59:44.2 52.8 ToO (09-Jan-2027) ODF Data PPS Data (Dr. S. Huang)

4851 0992190201 AT2019eve 11:28:49.60 +15:40:22.4 36.9 ToO (18-Dec-2026) ODF Data PPS Data (Dr. Z. Lin)

4841 0992190101 TDE2026hdo 10:31:52.60 +73:58:05.5 24.5 ToO (21-Nov-2026) ODF Data PPS Data (Dr. E. Hammerstein)

4835 0974792101 EP260302a 08:51:53.20 -65:59:02.0 35.0 ToO (12-Nov-2026) ODF Data PPS Data (Dr. Y. Zhang)

4834 0974792001 AT2022dyt 10:00:08.00 +26:27:38.5 50.0 ToO (18-Nov-2026) ODF Data PPS Data (Dr. S. Huang)

4831 0974792201 GRB260310A 14:37:16.20 +71:50:30.5 36.5 ToO (30-Oct-2026) ODF Data PPS Data (Dr. Y. Yang)

4827 0974791901 1A 0538-66 05:35:41.00 -66:51:53.6 33.5 ToO (29-Oct-2026) ODF Data PPS Data (Dr. L. Ducci)

4824 0970191501 1ES 1927+654 19:27:19.50 +65:33:54.4 28.0 ToO (22-Oct-2026) ODF Data PPS Data (Dr. M. Masterson)

4819 0970191401 1ES 1927+654 19:27:19.50 +65:33:54.4 27.4 ToO (15-Oct-2026) ODF Data PPS Data (Dr. M. Masterson)

4818 0970191301 1ES 1927+654 19:27:19.50 +65:33:54.4 28.0 ToO (08-Oct-2026) ODF Data PPS Data (Dr. M. Masterson)

4811 0974791701 AT2025aarm 04:32:12.40 -05:22:39.3 14.2 ToO (01-Oct-2026) ODF Data PPS Data (Dr. P. Baldini)

4806 0974791501 A0538-66 05:35:41.00 -66:51:53.6 33.2 ToO (17-Sep-2026) ODF Data PPS Data (Dr. P. Pradhan)

4797 0974791301 GRB251129A 14:57:18.90 +79:17:34.8 29.0 ToO (03-Sep-2026) ODF Data PPS Data (Dr. A. Martin-Carrillo)

4793 0974790301 Her X-1 16:57:49.80 +35:20:32.6 24.6 ToO (Public) ODF Data PPS Data (Dr. J. Wilms)

4792 0974790901 AT2025aarm 04:32:12.40 -05:22:39.3 25.0 ToO (Public) ODF Data PPS Data (Dr. P. Baldini)

4791 0974790701 GRB251129A 14:57:18.90 +79:17:34.8 30.8 ToO (Public) ODF Data PPS Data (Dr. A. Martin-Carrillo)

4786 0974790501 1A 1118-61 11:20:57.20 -61:55:00.1 20.0 ToO (Public) ODF Data PPS Data (Dr. C. Diez)

4785 0974790401 V1935 Cen 14:37:21.70 -58:47:43.4 57.4 ToO (Public) ODF Data PPS Data (Dr. M. Orio)

4783 0974790101 GRB251129A 14:57:18.90 +79:17:34.8 35.5 ToO (Public) ODF Data PPS Data (Dr. A. Martin-Carrillo)

4778 0970191201 1ES 1927+654 19:27:19.50 +65:33:54.4 29.5 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4777 0970191101 1ES 1927+654 19:27:19.50 +65:33:54.4 27.9 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4776 0970191001 1ES 1927+654 19:27:19.50 +65:33:54.4 29.4 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4772 0973391201 AT2025clz 12:58:13.10 -15:46:36.8 38.0 ToO (Public) ODF Data PPS Data (Dr. Z. Lin)

4762 0973390701 IC 3599 12:37:41.20 +26:42:27.7 124.9 ToO (Public) ODF Data PPS Data (Dr. D. Grupe)

4760 0973391101 TRAPPIST-1 23:06:30.99 -05:02:41.5 22.5 ToO (Public) ODF Data PPS Data (Dr. W. Howard)

4754 0973390801 TRAPPIST-1 23:06:31.00 -05:02:41.5 17.0 ToO (Public) ODF Data PPS Data (Dr. W. Howard)

4741 0970190901 1ES 1927+654 19:27:19.50 +65:33:54.4 29.9 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4739 0970190801 1ES 1927+654 19:27:19.50 +65:33:54.4 21.9 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4737 0970190701 1ES 1927+654 19:27:19.50 +65:33:54.4 25.0 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4736 0971191401 AT2024aehp 08:21:07.50 +28:44:22.2 46.0 ToO (Public) ODF Data PPS Data (Dr. Y. Yao)

4735 0973390601 4U1954+319 19:55:42.30 +32:05:49.2 53.0 ToO (Public) ODF Data PPS Data (Dr. C. Diez)

4730 0973390501 4U1822-37 18:25:46.80 -37:06:18.7 25.9 ToO (Public) ODF Data PPS Data (Dr. T. Di Salvo)

4730 0973390401 LEDA 251523 07:31:29.50 -74:10:31.4 40.1 ToO (Public) ODF Data PPS Data (Dr. J. Hu)

4729 0973390301 ASKAP J1745 17:45:08.90 -50:51:50.0 48.0 ToO (Public) ODF Data PPS Data (Dr. N. Rea)

4727 0971191001 HAT-P-11 19:50:50.30 +48:04:51.2 37.6 ToO (Public) ODF Data PPS Data (Dr. K. Poppenhaeger)

4724 0973390201 EP250916a 17:52:57.30 -35:19:22.8 30.3 ToO (Public) ODF Data PPS Data (Dr. G. Illiano)

4720 0973390101 SAX J1808.4-3658 18:08:27.60 -36:58:44.4 34.0 ToO (Public) ODF Data PPS Data (Dr. S. Bhattacharya)

4711 0971191201 EP250630b 05:07:37.50 -69:24:11.1 61.4 ToO (Public) ODF Data PPS Data (Dr. C. Maitra)

4709 0971191301 NGC5907 ULX1 15:15:58.60 +56:18:10.7 63.4 ToO (Public) ODF Data PPS Data (Dr. D. Walton)

4709 0964050101 GW250818k 15:51:54.20 +30:54:08.3 54.0 ToO (08-Sep-2026) ODF Data PPS Data (Dr. E. Troja)

4698 0971190601 4U 0114+65 01:18:02.70 +65:17:29.7 23.0 ToO (Public) ODF Data PPS Data (Dr. J.M. Torrejon)

4697 0970190601 1ES 1927+654 19:27:19.50 +65:33:54.4 23.0 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4691 0971190701 AT2025clz 12:58:13.10 -15:46:36.8 33.4 ToO (Public) ODF Data PPS Data (Dr. Z. Lin)

4691 0971190501 T CrB 15:59:30.20 +25:55:12.7 64.0 ToO (Public) ODF Data PPS Data (Dr. G. Luna)

4685 0970190501 1ES 1927+654 19:27:19.50 +65:33:54.4 26.9 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4684 0970190401 1ES 1927+654 19:27:19.50 +65:33:54.4 27.0 ToO (Public) ODF Data PPS Data (Dr. M. Masterson)

4679 0971800101 NGC5907 ULX1 15:15:58.60 +56:18:10.1 90.0 ToO (Public) ODF Data PPS Data (Dr. D. Walton)

4671 0971190401 TRAPPIST-1 23:06:29.40 -05:02:29.0 26.8 ToO (Public) ODF Data PPS Data (Dr. W. Howard)

For ToO data prior to revolution 4670, please refer to the ToO Archive Page

Rev	Observation Id	Target	RA	Dec	Exp. Time (ksec)	Data Status	ODF Data when available	PPS Data when available	Proposer/ Comments
4899	0992191001	SAX J1748.9-2021	17:48:52.20	-20:21:32.4	34.0	ToO (TBD)	ODF Data	PPS Data	(Dr. G. Illiano)
4898	0992190601	LS I +61 303	02:40:31.60	+61:13:45.5	15.4	ToO (TBD)	ODF Data	PPS Data	(Dr. M. Chernyakova)
4897	0992190501	LS I +61 303	02:40:31.60	+61:13:45.5	18.2	ToO (TBD)	ODF Data	PPS Data	(Dr. M. Chernyakova)
4897	0991802701	AT2021aeuk	16:12:59.80	+42:19:40.1	30.0	ToO (TBD)	ODF Data	PPS Data	(Dr. J. Sun)
4894	0992190901	4U 1700+24	17:06:34.50	+23:58:18.5	37.3	ToO (TBD)	ODF Data	PPS Data	(Dr. S. Guillot)
4875	0992190401	SN2007it	14:18:25.60	-43:22:53.7	27.8	ToO (28-Jan-2027)	ODF Data	PPS Data	(Dr. R. Brose)
4867	0991802501	ZTF19acnskyy	13:35:19.90	+07:28:07.7	119.8	ToO (13-Jan-2027)	ODF Data	PPS Data	(Dr. H. Guo)
4866	0991802401	AT2022czy	12:22:01.10	+16:59:44.2	52.8	ToO (09-Jan-2027)	ODF Data	PPS Data	(Dr. S. Huang)
4851	0992190201	AT2019eve	11:28:49.60	+15:40:22.4	36.9	ToO (18-Dec-2026)	ODF Data	PPS Data	(Dr. Z. Lin)
4841	0992190101	TDE2026hdo	10:31:52.60	+73:58:05.5	24.5	ToO (21-Nov-2026)	ODF Data	PPS Data	(Dr. E. Hammerstein)
4835	0974792101	EP260302a	08:51:53.20	-65:59:02.0	35.0	ToO (12-Nov-2026)	ODF Data	PPS Data	(Dr. Y. Zhang)
4834	0974792001	AT2022dyt	10:00:08.00	+26:27:38.5	50.0	ToO (18-Nov-2026)	ODF Data	PPS Data	(Dr. S. Huang)
4831	0974792201	GRB260310A	14:37:16.20	+71:50:30.5	36.5	ToO (30-Oct-2026)	ODF Data	PPS Data	(Dr. Y. Yang)
4827	0974791901	1A 0538-66	05:35:41.00	-66:51:53.6	33.5	ToO (29-Oct-2026)	ODF Data	PPS Data	(Dr. L. Ducci)
4824	0970191501	1ES 1927+654	19:27:19.50	+65:33:54.4	28.0	ToO (22-Oct-2026)	ODF Data	PPS Data	(Dr. M. Masterson)
4819	0970191401	1ES 1927+654	19:27:19.50	+65:33:54.4	27.4	ToO (15-Oct-2026)	ODF Data	PPS Data	(Dr. M. Masterson)
4818	0970191301	1ES 1927+654	19:27:19.50	+65:33:54.4	28.0	ToO (08-Oct-2026)	ODF Data	PPS Data	(Dr. M. Masterson)
4811	0974791701	AT2025aarm	04:32:12.40	-05:22:39.3	14.2	ToO (01-Oct-2026)	ODF Data	PPS Data	(Dr. P. Baldini)
4806	0974791501	A0538-66	05:35:41.00	-66:51:53.6	33.2	ToO (17-Sep-2026)	ODF Data	PPS Data	(Dr. P. Pradhan)
4797	0974791301	GRB251129A	14:57:18.90	+79:17:34.8	29.0	ToO (03-Sep-2026)	ODF Data	PPS Data	(Dr. A. Martin-Carrillo)
4793	0974790301	Her X-1	16:57:49.80	+35:20:32.6	24.6	ToO (Public)	ODF Data	PPS Data	(Dr. J. Wilms)
4792	0974790901	AT2025aarm	04:32:12.40	-05:22:39.3	25.0	ToO (Public)	ODF Data	PPS Data	(Dr. P. Baldini)
4791	0974790701	GRB251129A	14:57:18.90	+79:17:34.8	30.8	ToO (Public)	ODF Data	PPS Data	(Dr. A. Martin-Carrillo)
4786	0974790501	1A 1118-61	11:20:57.20	-61:55:00.1	20.0	ToO (Public)	ODF Data	PPS Data	(Dr. C. Diez)
4785	0974790401	V1935 Cen	14:37:21.70	-58:47:43.4	57.4	ToO (Public)	ODF Data	PPS Data	(Dr. M. Orio)
4783	0974790101	GRB251129A	14:57:18.90	+79:17:34.8	35.5	ToO (Public)	ODF Data	PPS Data	(Dr. A. Martin-Carrillo)
4778	0970191201	1ES 1927+654	19:27:19.50	+65:33:54.4	29.5	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4777	0970191101	1ES 1927+654	19:27:19.50	+65:33:54.4	27.9	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4776	0970191001	1ES 1927+654	19:27:19.50	+65:33:54.4	29.4	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4772	0973391201	AT2025clz	12:58:13.10	-15:46:36.8	38.0	ToO (Public)	ODF Data	PPS Data	(Dr. Z. Lin)
4762	0973390701	IC 3599	12:37:41.20	+26:42:27.7	124.9	ToO (Public)	ODF Data	PPS Data	(Dr. D. Grupe)
4760	0973391101	TRAPPIST-1	23:06:30.99	-05:02:41.5	22.5	ToO (Public)	ODF Data	PPS Data	(Dr. W. Howard)
4754	0973390801	TRAPPIST-1	23:06:31.00	-05:02:41.5	17.0	ToO (Public)	ODF Data	PPS Data	(Dr. W. Howard)
4741	0970190901	1ES 1927+654	19:27:19.50	+65:33:54.4	29.9	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4739	0970190801	1ES 1927+654	19:27:19.50	+65:33:54.4	21.9	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4737	0970190701	1ES 1927+654	19:27:19.50	+65:33:54.4	25.0	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4736	0971191401	AT2024aehp	08:21:07.50	+28:44:22.2	46.0	ToO (Public)	ODF Data	PPS Data	(Dr. Y. Yao)
4735	0973390601	4U1954+319	19:55:42.30	+32:05:49.2	53.0	ToO (Public)	ODF Data	PPS Data	(Dr. C. Diez)
4730	0973390501	4U1822-37	18:25:46.80	-37:06:18.7	25.9	ToO (Public)	ODF Data	PPS Data	(Dr. T. Di Salvo)
4730	0973390401	LEDA 251523	07:31:29.50	-74:10:31.4	40.1	ToO (Public)	ODF Data	PPS Data	(Dr. J. Hu)
4729	0973390301	ASKAP J1745	17:45:08.90	-50:51:50.0	48.0	ToO (Public)	ODF Data	PPS Data	(Dr. N. Rea)
4727	0971191001	HAT-P-11	19:50:50.30	+48:04:51.2	37.6	ToO (Public)	ODF Data	PPS Data	(Dr. K. Poppenhaeger)
4724	0973390201	EP250916a	17:52:57.30	-35:19:22.8	30.3	ToO (Public)	ODF Data	PPS Data	(Dr. G. Illiano)
4720	0973390101	SAX J1808.4-3658	18:08:27.60	-36:58:44.4	34.0	ToO (Public)	ODF Data	PPS Data	(Dr. S. Bhattacharya)
4711	0971191201	EP250630b	05:07:37.50	-69:24:11.1	61.4	ToO (Public)	ODF Data	PPS Data	(Dr. C. Maitra)
4709	0971191301	NGC5907 ULX1	15:15:58.60	+56:18:10.7	63.4	ToO (Public)	ODF Data	PPS Data	(Dr. D. Walton)
4709	0964050101	GW250818k	15:51:54.20	+30:54:08.3	54.0	ToO (08-Sep-2026)	ODF Data	PPS Data	(Dr. E. Troja)
4698	0971190601	4U 0114+65	01:18:02.70	+65:17:29.7	23.0	ToO (Public)	ODF Data	PPS Data	(Dr. J.M. Torrejon)
4697	0970190601	1ES 1927+654	19:27:19.50	+65:33:54.4	23.0	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4691	0971190701	AT2025clz	12:58:13.10	-15:46:36.8	33.4	ToO (Public)	ODF Data	PPS Data	(Dr. Z. Lin)
4691	0971190501	T CrB	15:59:30.20	+25:55:12.7	64.0	ToO (Public)	ODF Data	PPS Data	(Dr. G. Luna)
4685	0970190501	1ES 1927+654	19:27:19.50	+65:33:54.4	26.9	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4684	0970190401	1ES 1927+654	19:27:19.50	+65:33:54.4	27.0	ToO (Public)	ODF Data	PPS Data	(Dr. M. Masterson)
4679	0971800101	NGC5907 ULX1	15:15:58.60	+56:18:10.1	90.0	ToO (Public)	ODF Data	PPS Data	(Dr. D. Walton)
4671	0971190401	TRAPPIST-1	23:06:29.40	-05:02:29.0	26.8	ToO (Public)	ODF Data	PPS Data	(Dr. W. Howard)