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Swift Target of Opportunity Request Summary

Below we summarize details for a given TOO request. Note not all details of the TOO request are made public.

TOO request for GX 339-4


RequesterDel Santo
Time Submitted2024-01-29 06:14:03
UrgencyMedium Urgency (days to a week)
Object NameGX 339-4
Type or ClassificationX-Ray Transient
Right Ascension (J2000)255.70575 (= 17h 02m 49.0s)
Declination (J2000)-48.78977 (= -48° 47' 23.0'')
Position Error (90% confidence - arcminutes)0.5
Science Justification
Exposure Time per Visit (s)500
Number of Visits10
Total Exposure (s)15000
Immediate Objective
UVOT Mode0x9999: Default (Filter of the day)
Primary Target ID14052

Below are tentative scheduling windows for this ToO request. Note that the 'Observed Time' is just an approximation for your convenience and may not be complete. Please check the online version of the Swift schedule for the full listing of observed times.

#Window StartWindow StopXRT
Exposure (s)Observed
Time (s)
12024-02-01 00:00:002024-02-02 00:00:00WT0x999915001400
22024-02-04 00:00:002024-02-05 00:00:00WT0x999915001450
32024-02-07 00:00:002024-02-08 00:00:00WT0x999915001475
42024-02-10 00:00:002024-02-11 00:00:00WT0x999915001625
52024-02-13 00:00:002024-02-14 00:00:00WT0x99991500930
62024-02-15 00:24:002024-02-15 00:36:00WT0x9999500400
72024-02-15 01:59:002024-02-15 02:11:00WT0x9999500395
82024-02-15 03:34:002024-02-15 03:46:00WT0x9999500405
92024-02-19 00:00:002024-02-20 00:00:00WT0x999915001175
102024-02-22 00:00:002024-02-23 00:00:00WT0x99991500205
112024-02-25 00:00:002024-02-26 00:00:00WT0x999915002120
122024-02-28 00:00:002024-02-29 00:00:00WT0x99991500265

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Swift MOC Team Leads

Mission Director: John Nousek
Science Operations: Jamie Kennea
Flight Operations: Mark Hilliard
UVOT: Michael Siegel
XRT: Jamie Kennea