P73-504: Probing the Fast X-ray Transients by Einstein Probe

PI: Johan P. U. Fynbo, Dong Xu

ALFOSC/StanCam + NOTCam ToO program with override status

ToO triggers have override status.

This program has 5 hours of RRM mode with ALFOSC.

The OB generator will be used to request all observations.
The OBs will automatically appear in the OB queue and OB generated scripts will be automatically placed in the directory ~/scripts/73-504/.

For the observer:

Go to the directory
cd ~/scripts/73-504
List the available scripts
ls -lrt
and execute the OB generated scripts requested.
If you cannot find the corresponding observing script, please (re-)compile it from the Queue interface.

In the case of NOTCam, make sure that differential skyflats are obtained for the camera and filter setup that is requested.

Remember to fill the RRM or ToO or SoftToO tracking logs of this program.

Program Tracking
Proposal	73-504
Semester	P73: 20260401 - 20261001
Principal Investigator	Johan P. U. Fynbo, Dong Xu (NTE guaranteed time)
Programme	Probing the Fast X-ray Transients by Einstein Probe
Instrument	ALFOSC+NOTCam+StanCam
Time Allocation	22 hours ToO 8 hours SoftToO; 3 hours ToO 2 hours SoftToO; 5 hours RRM
Total Nights	40h
Type	RRM/ToO/SoftToO
Notes	Override
Total Time Spent	16:51 (hh:mm)

Proposal	Date	Time	Type	Targets	Files	Comments	Status
73-504	2026-04-02	00:27	SoftToO	EP260321a, sp1036+433	ALJd020047 - ALJd020061	Observed with good seeing, ~1", but high air-dust-level, SNR of quickspecs seemed good. Data shared with another program.	Observed
73-504	2026-04-05	00:20	ToO	EP260405a	ALJd050096 - ALJd050100	Observed with clear skies and dusty conditions.	Observed
73-504	2026-04-06	00:31	ToO	EP260406C1	NCJd060547 - NCJd060566	Target observed with no issues under clear skies and seeing below 1"	Observed
73-504	2026-04-07	00:54	SoftToO	EP260321a, sp1036+433	ALJd070107 - ALJd070115, ALJd070146 - ALJd070149	Observed with clear sky and seeing mostly around 2.5"	Observed
73-504	2026-04-11	00:55	SoftToO	EP260321a, sp1036+433	ALJd110065 - ALJd110073, ALJd110085 - ALJd110088	Observed under clear skies and sub-arcsec seeing.	Observed
73-504	2026-04-13	00:06	ToO	EP260321a	ALJd130157 - ALJd130159	OK	Observed
73-504	2026-04-14	01:12	SoftToO	SP1446+259, EP260414C1	ALJd140106 - ALJd140109, ALJd140130 - ALJd140136	Both OBs observed with clear skies and seeing between 2-3". Standard star observed at a similar airmass as science target, around 1.4.	Observed
73-504	2026-04-15	00:25	ToO	hd84937, EP260321A, EP260321a	ALJd150064 - ALJd150088	Both spectroscopy and imaging observed with clear skies and good seeing. spectroscopy data shared form another program.	Observed
73-504	2026-04-16	01:30	ToO	EP260416a, SP1446+259	ALJd160173 - ALJd160175, ALJd160184 - ALJd160190, ALJd160191 - ALJd160194	Imaging conducted with thin clouds and seeing around 1.5". Spectroscopy conducted with thin clouds and seeing around 2".	Observed
73-504	2026-04-21	00:52	ToO	sp1036+433, EP260321a	ALJd210089 - ALJd210092, ALJd210093 - ALJd210101	good conditions!	Observed
73-504	2026-04-22	00:25	ToO	EP260416a	ALJd220054 - ALJd220057	Went smoothly. Seeing not great.	Observed
73-504	2026-04-27	00:53	ToO	EP260321a, sp1036+433	ALJd270135 - ALJd270144	Observed with clear skies and seeing around 0.9".	Observed
73-504	2026-04-28	00:16	ToO	EP260321a	NCJd280307 - NCJd280316	Observed successfully with clear sky and subarcsec seeing	Observed
73-504	2026-04-29	00:23	ToO	EP260429a	NCJd290312 - NCJd290326	Target observed with clear sky and subarcsec seeing	Observed
73-504	2026-05-03	00:56	SoftToO	sp1036+433, EP260321a	ALJe030077 - ALJe030080, ALJe030097 - ALJe030105	Clear skies, seeing ~1.2"	Observed
73-504	2026-05-07	00:52	ToO	EP260507a	ALJe070110 - ALJe070118	Observed with clear sky and seeing about 1.5''.	Observed
73-504	2026-05-09	00:50	SoftToO	EP260321a, SP0946+139	ALJe090064 - ALJe090072, ALJe090081 - ALJe090084	Observed with seeing around 1" and partially through thin clouds	Observed
73-504	2026-05-09	00:19	ToO	EP260509a	ALJe090127 - ALJe090129	Observed with thin clouds and seeing around 1.4"	Observed
73-504	2026-05-15	00:24	ToO	EP260514a	ALJe150079 - ALJe150082	Observed under clear skies and seeing around 1.0".	Observed
73-504	2026-05-16	00:51	ToO	EP260321a, SP0946+139	ALJe160068 - ALJe160076, ALJe160077 - ALJe160080	Observed under clear skies with seeing between 1.2" - 1.4".	Observed
73-504	2026-05-27	00:38	SoftToO	EP260526a	ALJe270073 - ALJe270082	Observed with clear skies and seeing of around 1".	Observed
73-504	2026-05-29	00:50	ToO	EP260527a	ALJe290045 - ALJe290053	observed through twilight under clear skies and sub-arcsecond seeing.	Observed
73-504	2026-05-31	00:33	ToO	SP1045+378, ep260530a	ALJe310065 - ALJe310082	Terminated standard star OB a few times due to guiding troubles. When clouds cleared up the standard was obtained. Both imaging and spectra were taken. Only counting time used for the last standard exposure.	Observed
73-504	2026-06-01	00:13	ToO	EP260601C1	STJf010001 - STJf010003	Observed under poor seeing conditions and clear skies.	Observed
73-504	2026-06-02	01:16	ToO	EP260602C1, EP260601a, EP260602C2	STJf020001 - STJf020003, NCJf020238 - NCJf020282	OBserved targets after midnight and technical tests. Highly variable seeing conditions due to strong winds.	Observed

The above information is collected from the ToO/Mon reports that have been created by the observer.

Should any of the observations have been carried out using the OB system, you will find additional information HERE

Last modified: March 17 2026