CALGBMMSTR - CALET Gamma-Ray Burst Monitor (GBM) Master Catalog

Overview

The CALGBMMSTR database table records high-level information of the observations obtained with the CALET Gamma-ray Burst Monitor (CGBM), the second scientific payload on the CALorimetric Electron Telescope (CALET) mission. The Gamma-ray Burst Monitor provides a broadband energy coverage from 7 keV to 20 MeV and simultaneous observations with the primary instrument CALET Calorimeter (CCAL) in the GeV - TeV gamma-ray range and with the Advanced Star Camera (ASC) in the optical for gamma-ray bursts (GRBs) and other X-ray/gamma-ray transients.

CALET is a Japanese mission led by JAXA, in collaboration with the Italian Space Agency (ASI) and NASA, and it is dedicated to the study of high energy cosmic rays. CALET was launched on August 19, 2015, by a Japanese carrier, H2 Transfer Vehicle, and robotically installed on the Japanese Experiment Module-Exposed Facility (JEM-EF) on the International Space Station (ISS). CALET started scientific observations in October, 2015.

Catalog Bibcode

2019ICRC...36..571K

Bulletin

The CALGBMMSTR database table was last updated on 4 February 2021.

References

CALET Gamma-ray Burst Monitor (CGBM)
  Yamaoka, K, et al., 2013, 33th International Cosmic Ray Conference (ICRC2013),
     =2013ICRC...33.2948Y

CALET GBM Observations of Gamma-ray Bursts and Gravitational Wave Sources
  Yamaoka, K, and Calet Collaboration, 2017, 35th International Cosmic Ray Conference (ICRC2017),
     =2017ICRC...35..614Y

Gamma-ray burst observations with the CALET Gamma-ray Burst Monitor
  Kawakubo, V., 2019, 36th International Cosmic Ray Conference (ICRC2019),
     =2019ICRC...36..571K

Provenance

The CALET GBM Team in collaboration with DARTS and HEASARC developed the FITS file structure for the GBM data and their archive. The CALET GBM data are delivered by the CALET GBM team in Japan to the DARTS archive located at ISAS (Japan). The HEASARC hosts a copy of these data and generates this database table by collecting high-level information from the data. The data and the database table are updated regularly during operation. The first data release includes PH and TH data. Event data and the image from the ASC are added in a second phase.

Description

The CALET mission is comprised of two detectors: the calorimeter (named CALET) and the Gamma-ray Burst Monitor (Tori S. and CALET Collaboration, 2017, ICRC, 35, 1092). In addition at the top near the CGBM is an autonomous miniature star tracker, the Advance Stellar Compass (ASC), capable to determine the attitude with arcseconds precision and allows to obtain precise determination of the CALET pointing directions.

The CGBM is sensitive from the soft X-ray (~7 keV) to the Gamma-ray (~10 MeV) range and consists on two type of detectors: the Hard X-ray Monitor (two identical units, HXM1 and HXM2) to cover the lower energy (7 keV - 1000 keV) and Soft Gamma-ray Monitor (SGM) to cover the higher energy 100 keV - 20 MeV.

The CALET GBM collect data in three modes: the PH mode, the TH mode and the Event mode. The PH and TH modes are always running and served as monitoring data, the Event mode is activated only if the GBM is triggered by transient event. The ASC provides an optical image of the field of view.

The data are divided by day and assigned a unique observation identifier based on the observing day (YYYYMMDD). Each row of the database table corresponds to a specific day and has an associated data recorded for that day. All the CGBM subunits (HXM1, HXM2 and SGM) collect data in the TH, PH and Event data. The TH and PH data are always recorded while the Event and optical image are present only if a trigger occurs on board. The TH monitoring data consists in binned data in 4 energy bands sampled every 0.125 sec in low gain and high gain. The PH Monitoring data are instead spectra sampled every 4 sec in low gain (102 channels) and high gain (410 channels). The Event data are collected in both low and high gain over an interval of time which typically covers 100 sec before the trigger and about 512 after the trigger. Each observation contains always data from the TH and PH mode and Event mode data are present only if a trigger occurs.

Each record of the database includes rates for TH data in low and high gain for all the subunits (HXM1, HXM2, SGM). It also includes the from Event mode if these data are present within the observation. The rates from the TH and Event mode data are calculated using all the data within the file without any filtering.

Parameters

ObsID
This parameter contains a unique row identifier for the database table. It is an 8-digit number, YYYYMMDD, representing the year, month and day of the lightcurve. The obsid is also the unique identifier assigned to each observation, the sequence number.

Time
The start time of the observation. The data have been divided into 1-day observations. This time corresponds to the start of the day.

End_Time
The end time of the observation. The data have been divided into 1-day observations. This time corresponds to the end of the day.

Processing_Date
This parameter records the date when the data were last processed.

Processing_Version
This records the version of the processing script used in the pipeline to generate the data products for the observation.

HX1_THH_Total_Counts
Total counts in HXM1 TH High Gain mode. This is obtained by summing all values in the column COUNTS of the HXM1 TH High Gain FITS file. The value is set to -1 if no TH data are present.

HX1_THH_Rate
Average count rate in HXM1 TH High Gain mode. This value is obtained divided the total counts by the total exposure (parameters hx1_thh_total_count and hx1_thh_exposure). The value is set to -1 if no TH data are present.

HX1_THH_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the HXM1 TH High Gain FITS file. The value is set to -1 if no TH data are present.

HX1_THL_Total_Counts
Total counts in HXM1 TH Low Gain mode. This is obtained by summing all values in the column COUNTS of the HXM1 TH Low Gain FITS file. The value is set to -1 if no TH data are present.

HX1_THL_Rate
Average count rate in HXM1 TH Low Gain mode. This value is obtained divided the total counts by the total exposure (parameters hx1_thl_total_count and hx1_thl_exposure). The value is set to -1 if no TH data are present.

HX1_THL_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the HXM1 TH Low Gain FITS file. The value is set to -1 if no TH data are present.

HX2_THH_Total_Counts
Total counts in HXM2 TH High Gain mode. This is obtained by summing all values in the column COUNTS of the HXM2 TH High Gain FITS file. The value is set to -1 if no TH data are present.

HX2_THH_Rate
Average count rate in HXM2 TH High Gain mode. This value is obtained divided the total counts by the total exposure (parameters hx1_thh_total_count and hx1_thh_exposure). The value is set to -1 if no TH data are present.

HX2_THH_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the HXM2 TH High Gain FITS file. The value is set to -1 if no TH data are present.

HX2_THL_Total_Counts
Total counts in HXM2 TH Low Gain mode. This is obtained by summing all values in the column COUNTS of the HXM2 TH Low Gain FITS file. The value is set to -1 if no TH data are present.

HX2_THL_Rate
Average count rate in HXM2 TH Low Gain mode. This value is obtained divided the total counts by the total exposure (parameters hx2_thl_total_count and hx2_thl_exposure). The value is set to -1 if no TH data are present.

HX2_THL_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the HXM2 TH Low Gain FITS file. The value is set to -1 if no TH data are present.

SGM_THH_Total_Counts
Total counts in SGM TH High Gain mode. This is obtained by summing all values in the column COUNTS of the SGM TH High Gain FITS file. The value is set to -1 if no TH data are present.

SGM_THH_Rate
Average count rate in SGM TH High Gain mode. This value is obtained divided the total counts by the total exposure (parameters sgm_thh_total_count and sgm_thh_exposure). The value is set to -1 if no TH data are present.

SGM_THH_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the SGM TH High Gain FITS file. The value is set to -1 if no TH data are present.

SGM_THL_Total_Counts
Total counts in SGM TH Low Gain mode. This is obtained by summing all values in the column COUNTS of the SGM TH Low Gain FITS file. The value is set to -1 if no TH data are present.

SGM_THL_Rate
Overrate count rate in SGM TH Low Gain mode. This value is obtained divided the total counts by the total exposure (parameters sgm_thl_total_count and sgm_thl_exposure). The value is set to -1 if no TH data are present.

SGM_THL_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing all values in the column EXPOSURE of the SGM TH Low Gain FITS file. The value is set to -1 if no TH data are present.

HX1_Evt_Flag
Flag to indicate if the HXM1 Events mode data are present. (0 not present, 1 data are present)

HX1_Evt_Total_Counts
Total events (counts) in HXM1 event mode. This is obtained by summing all rows present in the HXM1 Event FITS file. The value is set to -1 if no Event data are present.

HX1_Evt_Rate
Average count rate in HXM1 Event mode. This value is obtained divided the total counts by the total exposure (parameters hx1_evt_total_counts and hx1_evt_exposure). The value is set to -1 if no Event data are present.

HX1_Evt_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing Good Time Intervals in the HXM1 Event FITS file. The value is set to -1 if no Event data are present.

HX2_Evt_Flag
Flag to indicate if the HXM2 Events mode data are present. (0 not present, 1 data are present)

HX2_Evt_Total_Counts
Total events (counts) in HXM2 event mode. This is obtained by summing all rows present in the HXM2 Event FITS file. The value is set to -1 if no Event data are present.

HX2_Evt_Rate
Average count rate in HXM2 Event mode. This value is obtained divided the total counts by the total exposure (parameters hx2_evt_total_counts and hx2_evt_exposure). The value is set to -1 if no Event data are present.

HX2_Evt_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing Good Time Intervals in the HXM2 Event FITS file.

SGM_Evt_Flag
Flag to indicate if the SGM Event mode data are present. (0 not present, 1 data are present)

SGM_Evt_Total_Counts
Total events (counts) in SGM Event mode. This is obtained by summing all rows present in the SGM Event FITS file. The value is set to -1 if no Event data are present.

SGM_Evt_Rate
Aver-ate count rate in SGM Event mode. This value is obtained divided the total counts by the total exposure (parameters hx2_evt_total_counts and hx2_evt_exposure). The value is set to -1 if no Event data are present.

SGM_Evt_Exposure
This parameter corresponds to the total effective exposure recorded in the 1-day observing time. This is obtained by summing Good Time Intervals in the SGM Event FITS file. The value is set to -1 if no Event data are present.

Num_Trigger
Number of triggers within the observation. The value is set to -1 if no triggers were recorded on board.

Trigger1
This parameter contains the trigger number of the first trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger2
This parameter contains the trigger number of the second trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger3
This parameter contains the trigger number of the third trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger4
This parameter contains the trigger number of the fourth trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger5
This parameter contains the trigger number of the fifth trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger6
This parameter contains the trigger number of the sixth trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger7
This parameter contains the trigger number of the seventh trigger in the observation. The value is set to -1 if no such trigger occurred.

Trigger8
This parameter contains the trigger number of the eighth trigger in the observation. The value is set to -1 if no such trigger occurred.

Contact Person

Questions regarding the CALGBMMSTR database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:25:12 EDT