IXPE Cycle 3 ToO Triggers



Proposal Target ToO Prob Response Trigger 2-8keV countrate MDP99 Dither Filter PI Exclusive Use IXPE Time [ ks ] XRISM Time[ ks ] NuSTAR Time [ ks ] Swift Time [ ks ]

3001 V 0332+53 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0
3001 4U 0115+63 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0
3001 GRO J1744-28 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0
3001 GRO J1008-57 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0
3001 1A 0535+262 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0
3001 KS 1947+300 0.1 MEDIUM The criterion for the requested ToO observation triggering is based on the ongoing monitoring of the source with Swift (BAT) and MAXI. The observation will be triggered if the source luminosity will exceed the critical value of 5x10^37 erg/s. 200 1 MEDIUM OPEN SERGEY TSYGANKOV 6 600 0 0 0

3031 H1743-322 0.3 MEDIUM H1743-322 is detected in a rising outburst and exceeds 50 mCrab intensity from any monitoring mission (e.g., MAXI, Swift BAT, etc). 7.6 1.1 MEDIUM OPEN JAMES STEINER 2 200 0 40 20
3031 H1743-322 0.4 LOW (1) H1743-322 has exceeded 250 mCrab intensity during the outburst (e.g., as seen by MAXI). (2) H1743-322 shows transition to thermal state, e.g., defined as MAXI color [4-10/2-4] < 0.25. (3) Thermal state persists for a duration >= 1 week (hardness criterion holds). 30 0.8 MEDIUM OPEN JAMES STEINER 2 100 0 40 20

3036 MRK 421 0.5 MEDIUM MAXI: > 0.27 photons cm-2 s-1 in the 2.0 20.0 keV band or Swift-XRT >85 cts/s in the 0.3 10 KeV band or VERITAS >5e-10 ph m-2 s-1 above 200 GeV 3.1 7 MEDIUM OPEN OLIVIER HERVET 150 0 0 40

3091 NGC 4151 0.1 HIGH 33 Swift pointings (1 ks each) spaced every 4 days, starting 8 days before each window and ending 10 days before the windows end. If the observed flux is F(2-8 keV)<=5e-11 erg/s/cm^2 for two consecutive pointings, then IXPE and simultaneous NuSTAR observations are triggered. 0.409 4.8 MEDIUM OPEN VITTORIA GIANOLLI 900 0 75 33

3101 GRS 1915+105 0.1 MEDIUM We plan to conduct the proposed IXPE observation during a period when the source exhibits an X-ray flare, surpassing the MAXI/GSC count rate of 0.2 cps. 6.2 1.5 MEDIUM OPEN KARRI KOLJONEN 100 0 0 0

3111 BH XRB 0.5 MEDIUM Before triggering we will use MAXI monitoring to confirm that the predicted IXPE 2--8 keV count rate of the outbursting source is &#8805;30 c/s (corresponding to a flux of 3.83e-9 erg cm^-2 s^-1, and we will use 1ks of Swift/XRT monitoring per trigger to confirm the presence of a Type-C QPO. 30 0.49 MEDIUM OPEN MELISSA EWING 6 300 0 20 0

3129 ACCRETING MSP 0.5 MEDIUM A 0.5-10 keV flux > 3E-10 erg/cm2/s (~10 mCrab) from an already known or newly discovered AMSP, as detected by All Sky X-ray monitors (e.g., Einstein Probes), and/or when optical robotic telescopes (e.g. XB-NEWS at LCO) detect the onset of the outburst, a few days before the source brightens in X-ray. 3.87 0.8 MEDIUM OPEN ALESSANDRO PAPITTO 6 900 0 80 0

3171 T CRB 0.5 HIGH After the onset of the nova event that will be known from optical observations. 4.2 3 MEDIUM OPEN MANEL ERRANDO 3 500 0 0 0

3207 V404 CYG 0.08 MEDIUM We would trigger the observations when the source crosses a threshold of 30 mCrab of flux in 2-10 keV band in MAXI. 2.2 1.9 MEDIUM OPEN SUDIP CHAKRABORTY 6 300 0 40 0
3207 V4641 SGR 0.2 MEDIUM We would trigger the observations when the source crosses a threshold of 30 mCrab of flux in 2-10 keV band in MAXI. 2.1 1.8 MEDIUM OPEN SUDIP CHAKRABORTY 6 300 0 40 0

3208 HER X-1 1 LOW See the phase dependence. The given ephemeris is good to a few days but has to be adjusted about 35 days ahead of the first IXPE observation. 15 1.5 MEDIUM OPEN HERMAN MARSHALL 6 750 45 0 0

3252 SOFT-STATE BHXB 0.3 MEDIUM Black Hole X-ray binary entering the soft state with disk temperature having exceeded at least 1.0 keV and surpassed a brightness of 300 mCrab. This will be determined through MAXI and Swift monitoring, as well as community ATels. 91.14 0.25 MEDIUM OPEN SWATI RAVI 6 450 0 40 4
3252 SOFT-STATE BHXB 0.45 LOW Black Hole X-ray binary entering the soft state with disk temperature having exceeded at least 1.0 keV and surpassed a brightness of 300 mCrab. This will be determined through MAXI and Swift monitoring, as well as community ATels. This second trigger is intended to probe the disk at 0.9 keV 91.14 0.25 MEDIUM OPEN SWATI RAVI 6 950 0 40 4

3258 GRS 1915+105 0.03 MEDIUM The source returns to to it's pre-2019 flux state (>~0.2 c/s in MAXI 2-10keV band), and monitoring shows evidence it is in the \chi spectral state 25.5 0.7 MEDIUM OPEN EDWARD NATHAN 250 0 60 0
3258 GRS 1915+105 0.3 MEDIUM The source returns to to it's pre-2019 flux state (>~0.2 c/s in MAXI 2-10keV band), and monitoring shows evidence it is in a disc-dominated spectral state 90.27 0.28 MEDIUM OPEN EDWARD NATHAN 400 0 60 0
3258 GRS 1915+105 0.03 MEDIUM The source returns to to it's pre-2019 flux state (>~0.2 c/s in MAXI 2-10keV band), and monitoring shows evidence it is demonstrating exotic variability 117.973 0.32 MEDIUM OPEN EDWARD NATHAN 300 0 60 0