ToO Information
Request ID: 57077
Request Type: NEW
ToO Urgency: WITHIN A WEEK
Proposal ID:
Target Info
Target Name: GS 1826-238
Target No.:
Category: X-RAY BINARIES
Coordinates[J2000]: (277.37000, -23.79667)
Exp (ks): 20
Extended: N
Extent Size:
Background Restriction: N
Remarks:
Constraint Details
Monitor: Y
Criteria: One 10ks observation within a day (around 28-30 of June), and another 10ks roughly a week later which could be scheduled in coordination with a Chandra DDT request (to be submitted tomorrow).
Phase Dependent: N
Epoch:
Period:
Min:
Max:
Remarks:
Specific Time: Y
Start: 2025-06-28 00:00 UTC
End: 2025-06-30 00:00 UTC
Remarks: The first 10ks should be taken as soon as possible in case the source changes its state back to the soft state. The second 10ks would be optimally scheduled roughly week later together with Chandra (DDT proposal in prep.).
ToO: Y
Coordinate Observation: PREFERRED
Observatory: CHANDRA
Description: We will trigger a 35ks Chandra DDT proposal tomorrow, as Chandra is the only facility to continuously observe the target over the expected 1.6 - 3 hour recurrence period. Chandra visibility starts in June 30, but we do not expect them to react before July 4th.
Uninterrupted: N
Justification:
Estimated Count Rate (cts s-1): 1500.000
Requester Information
Name: DR. JARI JUHA EEMELI KAJAVA
Status
Request Date (UTC): 2025-06-25 16:52:51
Disposition: Rejected
Date: 2025-07-14 15:19:11.889828
Reason: NICER pointing anomaly
Person:
Status: Unable to Execute
Date: 2025-07-14 15:19:11.889828
Person:
Misc
Note:
Target Details
Nearest Target No: 7056
Nearest Taget Name: GS_1826-24
Separation (arcmin): 0.1379
Nearby Target (<3.0'): 2425[GS_1826-24],7056[GS_1826-24]
Referenced Target Catalogue: /Home/eud/nicerweb/too/ags/NICER2_Xray_Target_List_V43o.csv.gz
Sun Angle: 177.2 deg at 2025:176:16:54:12 (UTC), 169.4 deg after 2 weeks
Planned Observations
AGS6 Reference:
Planned Snapshots:
| Observation Start |
Observation End |
Span |
Mode |
Observation ID |
| (YYYY-DDDTHH:MM:SS) |
(YYYY-DDDTHH:MM:SS) |
(seconds) |
Man/Opt |
|
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 |