ToO Information
Request ID: 53388
Request Type: NEW
ToO Urgency: WITHIN A WEEK
Proposal ID:
Target Info
Target Name: 4U 1608-52
Target No.: 1975
Category: X-RAY BINARIES
Coordinates[J2000]: (243.17900, -52.42380)
Exp (ks): 9
Extended: N
Extent Size:
Background Restriction: N
Remarks:
Constraint Details
Monitor: Y
Criteria: NICER s monitoring is essential to capture the spectral evolution and variability of 4U 1608-52 during its ongoing outburst. Three observations (3 ks each) at 0, 3, and 6 days post-trigger will allow us to track state transitions, thermonuclear bursts, and accretion flow changes in real time. This cadence ensures coverage of rapid spectral and timing evolution.
Phase Dependent: N
Epoch:
Period:
Min:
Max:
Remarks:
Specific Time: Y
Start: 2025-03-16 19:53 UTC
End: 2025-03-26 00:00 UTC
Remarks: The selected window (MJD 60750.8285 60760.0000) ensures coverage of the outburst evolution, spectral transitions, jet activity, and potential bursts during the most dynamically active phase of 4U 1608-52.
ToO: Y
Coordinate Observation: Y
Observatory: NUSTAR
Description: Simultaneous NICER and NuSTAR observations to track the 4U 1608-52 outburst, confirmed by ATCA (radio) and Swift/XRT (X-ray) detections (ATel #17037). NICER will monitor spectral evolution, bursts, and state transitions, while NuSTAR will provide broadband X-ray coverage, constraining Comptonization, reflection, and jets, and neutron star processes during key outburst phases.
Uninterrupted: N
Justification:
Estimated Count Rate (cts s-1): 800.000
Requester Information
Name: MS. RUCHIKA DHAKA
Status
Request Date (UTC): 2025-02-15 21:17:44
Disposition: Accepted
Date: 2025-03-12T14:55:07
Reason:
Person: Auto
Status: Complete
Date: 2025-03-28 17:14:14.698059
Person:
Misc
Note:
Target Details
Nearest Target No: 1975
Nearest Taget Name: 4U_1608-522
Separation (arcmin): 0.0426
Nearby Target (<3.0'): 1975[4U_1608-522]
Referenced Target Catalogue: /Home/eud/nicerweb/too/ags/NICER2_Xray_Target_List_V42q.csv.gz
Sun Angle: 109.5 deg at 2025:083:21:38:26 (UTC), 120.9 deg after 2 weeks
Planned Observations
AGS6 Reference: AGS6_STSCH_schedule_20250711400_20250841200_V01.txt.gz,AGS6_STSCH_schedule_20250711700_20250861200_V02.txt.gz,AGS6_STSCH_schedule_20250722058_20250811000_V02.txt.gz,AGS6_STSCH_schedule_20250731800_20250881200_V02.txt.gz,AGS6_STSCH_schedule_20250741200_20250881200_V01.txt.gz,AGS6_STSCH_schedule_20250741500_20250881200_V01.txt.gz,AGS6_STSCH_schedule_20250760000_20250881200_V02.txt.gz,AGS6_STSCH_schedule_20250761800_20250910000_V01.txt.gz,AGS6_STSCH_schedule_20250771400_20250910000_V01.txt.gz,AGS6_STSCH_schedule_20250791300_20250931200_V01.txt.gz,AGS6_STSCH_schedule_20250801300_20250931200_V02.txt.gz,AGS6_STSCH_schedule_20250801400_20250951200_V01.txt.gz,AGS6_STSCH_schedule_20250801400_20250951200_V02.txt.gz,AGS6_STSCH_schedule_20250821800_20250950000_V02.txt.gz,AGS6_STSCH_schedule_20250831500_20250960000_V02.txt.gz,AGS6_STSCH_schedule_20250831500_20250960000_V03.txt.gz
Planned Snapshots:
| Observation Start |
Observation End |
Span |
Mode |
Observation ID |
| (YYYY-DDDTHH:MM:SS) |
(YYYY-DDDTHH:MM:SS) |
(seconds) |
Man/Opt |
|
| 2025-081T05:40:06 |
2025-081T05:54:20 |
854 |
Mandatory |
99999999 |
| 2025-081T07:10:03 |
2025-081T07:27:20 |
1037 |
Mandatory |
99999999 |
| 2025-081T08:43:03 |
2025-081T09:00:40 |
1057 |
Mandatory |
99999999 |
Visibility
AGS3 Reference:
Visibility Report:
| Target Name |
Target ID |
Visibility Start |
Visibility End |
Span |
Initial |
Final |
Relative |
|
|
(YYYY-DDDTHH:MM:SS) |
(YYYY-DDDTHH:MM:SS) |
(seconds) |
Interference |
Interference |
Orbits |