Updated on 2025/06/23 OPERATION LOG OF THE XTEND INSTRUMENT Ordered by UT-Date of Occurrence (new to old). -------------------------------- 2025/05/12 05:28 – 2025/05/16 05:07 -------------------------------- Comment: - While observing a high-surface-brightness source, the number of Xtend events exceeded the onboard data recorder's capacity, resulting in loss of Xtend events until playback operations began (CCD1--4; CCD_ID = 0–3). This issue has no effect on the data quality of Resolve. The following intervals may have suffered event loss, and the GTIs do not currently exclude these periods (units: XRISM TIME [sec]): 200726938.0 - 200733855.0 200808879.0 - 200813768.0 200884937.0 - 200899569.0 200967050.0 - 200985402.0 201051706.0 - 201071278.0 Observation(s) related to this note: - 201040010 / PUPPIS_A_EJECTA -------------------------------- 2025/04/28 03:29 – 2025/04/28 04:28 -------------------------------- Comment: - A portion of the Xtend housekeeping (HK) data was lost during observation OBSID 201022010 (SPT-CL J2344-4243). The loss occurred because the sampling frequency of HK data was changed during a ground-station connection test. Pulse-invariant (PI) values may have been computed incorrectly due to an improper video card temperature correction (CCD1–4; CCD_ID = 0–3). The following interval was affected: 2025-04-28T03:29:14.5625 – 2025-04-28T05:10:46.5625. Observation(s) related to this note: - 201022010 / SPT-CL_J2344-4243 -------------------------------- 2025/04/10 18:22 - 2025/4/10 19:15 2025/04/11 18:14 - 2025/4/11 19:06 -------------------------------- Comment: - Dark level update had temporarily stopped (Dark values were fixed during this period). There may be degradation of spectral performance. Observation(s) related to this note: - 201046010 / SAGITTARIUS_C -------------------------------- 2024/11/23 - 2024/12/04 18:49 -------------------------------- Comment: - Area discrimination of CCD3 (see operation log 2023/11/18 14:50) has been inactive immediately after the recovery, and became effective after MNV to NGC4388 (4th Dec.). Observation(s) related to this note: - 201107010 / WR140 - 201070010 / HYDRA_A_CENTRAL - 201065010 / PG1211+143 -------------------------------- 2024/11/22 00:22 - 11/23 23:40 -------------------------------- Comment: - CCD1 and CCD2 were also stopped while CCD3 and CCD4 were being reset (from 2024/11/22 00:22 to 11/23 23:40). These are now available. Observation(s) related to this note: - 201015010 / ABELL754_MAIN - 201107010 / WR140 -------------------------------- 2024/11/11 09:22 - 11-23 23:40 -------------------------------- Comment: - The XRISM mission operation team detected an issue in Xtend's data readout system starting from 2024/11/11 at 09:22. Due to this issue, CCD3 and CCD4 (not aim-point chip) data are now unavailable. A cause investigation and development of a recovery plan are underway. - This issue causes no effect on the Resolve data. - (ps. on Dec 20) The readout system of CCD3 and CCD4 was reset from 11/22 to 11/23, and recovered at 2024/11/23 23:40. - (ps. on Dec 20) During the affected time (11/11-11/23), timing of SAA-related commands to CCD1, CCD2 were also affected and hence some anomalous events detected for CCD1, CCD2 and their spectroscopic performances may be affected. Observation(s) related to this note: - 201048010 / NGC4395 (not entire but part of the observation is affected) - 201132010 / MRK509 - 201049010 / ABELL1413 - 201103010 / PI_AQR - 201131010 / VELA_X-1 - 201015010 / ABELL754_MAIN - 201107010 / WR140 (not entire but part of the observation is affected) -------------------------------- 2024/8/27 14:36 - -------------------------------- Comment: - The numbers of hot pixels were increased by 1-30 in each segment across all CCD chips (CCD1-4; CCD_ID=0-3). The cause is under investigation, but the numbers have not changed since then. Observation(s) related to this note: - 300008020 / T_CORONA_BOREALIS - All observations to date after the above one. -------------------------------- 2024/03/18 02:21 - 2024/03/18 14:03 -------------------------------- Comment: - Event detection failure in rows ACTY=432-434 due to an anomaly dark levels (CCD2 CD; CCD_ID=1, SEGMENT=1). Observation(s) related to this note: - 100006010 / Crab_NEoffset_2 -------------------------------- 2024/03/10 06:26 - 2024/03/11 00:51 -------------------------------- Comment: - Event detection failure due to an inappropriate dark level calculations (CCD1-4; CCD_ID=0-3). Observation(s) related to this note: - 100011010 / HR1099 - 100011011 / HR1099 - 100011012 / HR1099 - 300072010 / PDS456 -------------------------------- 2024/03/10 06:27 - -------------------------------- Comment: - Change charge injection rows in full window mode to shift from the SXS nominal point (CCD1-4; CCD_ID=0-3). Observation(s) related to this note: - 100011010 / HR1099 - All observations after the abovementioned one -------------------------------- 2023/11/18 14:50 - -------------------------------- Comment: - Apply area discrimination in ACTX=321-327 to exclude dark columns (CCD3; CCD_ID=2). Observation(s) related to this note: - 000117000 / Z Cam - All observations after the abovementioned one -------------------------------- 2023/11/02 18:07 - 2023/11/09 03:48 -------------------------------- Comment: - Observations were interrupted due to an anomaly caused by an inappropriate command operation (CCD1-4; CCD_ID=0-3). Observation(s) related to this note: - 000105000 / 1E0102.2-7219 - 000106000 / Abell2319_BS - 000107000 / Cygnus_X-1_OFFSET - 000108000 / Cygnus_X-1_BS - 000109000 / Cygnus_X-1_OFFSET - 000110000 / 1E0102.2-7219 - 000111000 / Abell2319_BS - 000112000 / PKS_0745-19 -------------------------------- 2023/11/02 16:29 - -------------------------------- Comment: - Adjust window position in 1/8 window + 0.1s burst mode to cover the SXS nominal point (CCD1-2; CCD_ID=0-1). Observation(s) related to this note: - 000105000 / 1E0102.2-7219 - All observations with this window mode after the abovementioned observation -------------------------------- 2023/11/01 21:31 - -------------------------------- Comment: - Adjust window position in 1/8 window mode to cover the SXS nominal point (CCD1-2; CCD_ID=0-1). Observation(s) related to this note: - 000105000 / 1E0102.2-7219 - All observations with this window mode after the abovementioned observation