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FSW Requirement 5.3.11.7 (prev, next)

Req. 5.3.11.7: "LAT GRB Repoint Request Message to SC"

The SIU FSW shall send a GRB repoint request message, to the SC via the CTDB, when a GRB is detected that meets repoint criteria defined by a set of ground-settable parameters (see also section 5.3.10.2.1). Further details are provided in [11].

Basis (help)

[1] (3.1.2.4.2), [2] (3.2.6.5.1.2)

    1: "Mission System Spec." (NASA 433-SPEC-0001)

      3.1.2.4.2: "Repointing"

      The GLAST system shall be capable of repointing the observatory to observe qualified gamma-ray bursts.

    2: "LAT Instrument - Spacecraft Interface Requirements Doc." (NASA 433-IRD-0001)

      3.2.6.5.1.2: "Autonomous Repoint Request Telecommand"

      When a detected burst meets a LAT determined criteria, the LAT shall issue an Autonomous Repoint Request (ARR) telecommand to the SC.

    11: "LAT-GBM Interface Control Doc." (NASA 433-ICD-0001)

Context (help)

Test(s)

    002b: File Management and Memory Upload and Dump Verification

    This test shall verify that the FSW can, on command, report file system status, create and delete file directories, dump directories, delete files, copy files (on a single SIU or EPU, and from an SIU to an EPU), dump files, and load files during (SIU) primary boot. This test shall also verify the capability to successfully upload data into a specified block of SIU or EPU memory and verify the correct memory contents. This test shall also demonstrate the successful dump of the contents of a specific block of SIU or EPU memory. Finally, the test verifies that the event filter can be reprogrammed by choosing or replacing files in the file system.

    012b: Additional Science Processing - Repointing Logic

    This test verifies the LAT's internal logic for requesting repointing for LAT-detected GRBs. Verification shall include a variety of scenarios, including repointing enable, different operational modes, and conflicting requests. The test shall verify that the SIU FSW responds to these events properly, forwarding repointing requests to the SC, sending a command indicating the time of GRB detection, and (for a LAT-detected burst alert) issuing a LAT closeout message to the GBM.