ASCA Sequence 48001003 Event File Info

This page lists the filtered and unfiltered event files sorted by instrument and mode. Exposure times (not dead time corrected) and count rates are given for each file along with a list of FITS keywords describing the observation mode. Where two values are separated by a slash, the first value refers to the filtered event file and the second to the corresponding unfiltered file.

The following information is also available:

The processing header page

Here is in index of the event files for each instrument:

SIS 0
SIS 1
GIS 2
GIS 3

SIS0:

Total Exposure: 25.5 / 148.4 kiloseconds
Total Events: 2673528 / 6541527 events
Mean Count Rate: 104.733 / 44.067 events per second
Number of Files: 2 / 5

SIS0 BRIGHT mode event files with HIGH bit rate

ad48001003s000102h.evt / ad48001003s000102h.unf
- Exposure: 25.5 / 51.7 kiloseconds
- Events: 2671770 / 4977454 events
- Count Rate: 104.739 / 96.306 events per second
- Selected FITS Keywords:
  
  S0_ARENA= 0 / S0 Area discrimination enable/disable
ad48001003s000402h.evt / ad48001003s000402h.unf
- Exposure: 0 / 0.4 kiloseconds
- Events: 1758 / 32821 events
- Count Rate: 96.935 / 80.444 events per second
- Selected FITS Keywords:
  
  S0_ARENA= 1 / S0 Area discrimination enable/disable

SIS0 BRIGHT mode event files with MEDIUM bit rate

ad48001003s000202m.unf
- Exposure: 0 / 49 kiloseconds
- Events: 0 / 1410467 events
- Count Rate: NaN / 28.771 events per second
- Selected FITS Keywords:
  
  S0_ARENA= 1 / S0 Area discrimination enable/disable
ad48001003s000502m.unf
- Exposure: 0 / 0 kiloseconds
- Events: 0 / 1024 events
- Count Rate: NaN / 32 events per second
- Selected FITS Keywords:
  
  S0_ARENA= 0 / S0 Area discrimination enable/disable

SIS0 BRIGHT mode event files with LOW bit rate

ad48001003s000302l.unf
- Exposure: 0 / 47.3 kiloseconds
- Events: 0 / 119761 events
- Count Rate: NaN / 2.532 events per second
- Selected FITS Keywords:

SIS1:

Total Exposure: 25.6 / 148.5 kiloseconds
Total Events: 1287275 / 5781723 events
Mean Count Rate: 50.342 / 38.946 events per second
Number of Files: 3 / 6

SIS1 BRIGHT mode event files with HIGH bit rate

ad48001003s100102h.evt / ad48001003s100102h.unf
- Exposure: 25.5 / 51.7 kiloseconds
- Events: 1285751 / 4185640 events
- Count Rate: 50.324 / 80.885 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 0 / S1 Area discrimination enable/disable
ad48001003s100402h.evt / ad48001003s100402h.unf
- Exposure: 0 / 0.4 kiloseconds
- Events: 1419 / 25208 events
- Count Rate: 78.242 / 70.809 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 1 / S1 Area discrimination enable/disable

SIS1 BRIGHT mode event files with MEDIUM bit rate

ad48001003s100202m.evt / ad48001003s100202m.unf
- Exposure: 0 / 49 kiloseconds
- Events: 105 / 1415254 events
- Count Rate: 31.106 / 28.869 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 1 / S1 Area discrimination enable/disable
ad48001003s100602m.unf
- Exposure: 0 / 0 kiloseconds
- Events: 0 / 1024 events
- Count Rate: NaN / 32 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 0 / S1 Area discrimination enable/disable

SIS1 BRIGHT mode event files with LOW bit rate

ad48001003s100302l.unf
- Exposure: 0 / 45.2 kiloseconds
- Events: 0 / 150370 events
- Count Rate: NaN / 3.323 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 1 / S1 Area discrimination enable/disable
ad48001003s100502l.unf
- Exposure: 0 / 2 kiloseconds
- Events: 0 / 4227 events
- Count Rate: NaN / 2.064 events per second
- Selected FITS Keywords:
  
  S1_ARENA= 0 / S1 Area discrimination enable/disable

GIS2:

Total Exposure: 65.4 / 127.4 kiloseconds
Total Events: 3155069 / 3836735 events
Mean Count Rate: 48.248 / 30.12 events per second
Number of Files: 8 / 8

GIS2 PH mode event files with HIGH bit rate

ad48001003g200170h.evt / ad48001003g200170h.unf

Exposure: 30.6 / 47.6 kiloseconds
Events: 2640307 / 3138893 events
Count Rate: 86.348 / 65.913 events per second

Selected FITS Keywords:

SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	239	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	226	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g200670h.evt / ad48001003g200670h.unf

Exposure: 0 / 0 kiloseconds
Events: 1028 / 1254 events
Count Rate: 85.667 / 78.375 events per second

Selected FITS Keywords:

SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
SP_PH_F=	31098	/ Spread discri PH for FLF method (0-1023)

GIS2 PH mode event files with MEDIUM bit rate

ad48001003g200270m.evt / ad48001003g200270m.unf

Exposure: 32.6 / 40.7 kiloseconds
Events: 503710 / 591337 events
Count Rate: 15.456 / 14.545 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	239	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	226	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g200570m.evt / ad48001003g200570m.unf

Exposure: 0.1 / 0.3 kiloseconds
Events: 1730 / 3902 events
Count Rate: 15.377 / 13.549 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
SP_PH_F=	31098	/ Spread discri PH for FLF method (0-1023)

ad48001003g200770m.evt / ad48001003g200770m.unf

Exposure: 0.1 / 0.1 kiloseconds
Events: 843 / 867 events
Count Rate: 5.854 / 6.021 events per second

Selected FITS Keywords:

HV_RED=	ON	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	239	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	226	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g200870m.evt / ad48001003g200870m.unf

Exposure: 0.1 / 0.1 kiloseconds
Events: 393 / 796 events
Count Rate: 3.085 / 6.219 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	0	/ HV-High level (0 - 7)
HVL_LVL=	3	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	239	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	226	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

GIS2 PH mode event files with LOW bit rate

ad48001003g200370l.evt / ad48001003g200370l.unf

Exposure: 0.9 / 37.1 kiloseconds
Events: 3483 / 94512 events
Count Rate: 3.87 / 2.546 events per second

Selected FITS Keywords:

SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	239	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	226	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g200470l.evt / ad48001003g200470l.unf

Exposure: 0.9 / 1.4 kiloseconds
Events: 3575 / 5174 events
Count Rate: 3.849 / 3.675 events per second

Selected FITS Keywords:

SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
SP_PH_F=	31098	/ Spread discri PH for FLF method (0-1023)

GIS3:

Total Exposure: 65.4 / 127.4 kiloseconds
Total Events: 3441490 / 4131290 events
Mean Count Rate: 52.622 / 32.424 events per second
Number of Files: 12 / 12

GIS3 PH mode event files with HIGH bit rate

ad48001003g300170h.evt / ad48001003g300170h.unf

Exposure: 30.6 / 47.6 kiloseconds
Events: 2920041 / 3431540 events
Count Rate: 95.534 / 72.061 events per second

Selected FITS Keywords:

HVH_LVL=	3	/ HV-High level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g300670h.evt / ad48001003g300670h.unf

Exposure: 0 / 0 kiloseconds
Events: 1141 / 1382 events
Count Rate: 95.083 / 86.375 events per second

Selected FITS Keywords:

HVH_LVL=	3	/ HV-High level (0 - 7)
SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	31353	/ Spread discri PH for FLF method (0-1023)

ad48001003g300870h.evt / ad48001003g300870h.unf

Exposure: 0 / 0 kiloseconds
Events: 783 / 799 events
Count Rate: 97.875 / 99.875 events per second

Selected FITS Keywords:

HVH_LVL=	3	/ HV-High level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	0011111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g301070h.evt / ad48001003g301070h.unf

Exposure: 0 / 0 kiloseconds
Events: 418 / 694 events
Count Rate: 34.833 / 57.833 events per second

Selected FITS Keywords:

HVH_LVL=	1	/ HV-High level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

GIS3 PH mode event files with MEDIUM bit rate

ad48001003g300270m.evt / ad48001003g300270m.unf

Exposure: 32.6 / 40.6 kiloseconds
Events: 508702 / 590807 events
Count Rate: 15.624 / 14.549 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g300570m.evt / ad48001003g300570m.unf

Exposure: 0.1 / 0.3 kiloseconds
Events: 1751 / 3954 events
Count Rate: 15.563 / 13.729 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	31353	/ Spread discri PH for FLF method (0-1023)

ad48001003g300770m.evt / ad48001003g300770m.unf

Exposure: 0.1 / 0.1 kiloseconds
Events: 841 / 871 events
Count Rate: 5.84 / 6.049 events per second

Selected FITS Keywords:

HV_RED=	ON	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g300970m.evt / ad48001003g300970m.unf

Exposure: 0.1 / 0.1 kiloseconds
Events: 262 / 716 events
Count Rate: 2.056 / 5.594 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	0	/ HV-High level (0 - 7)
HVL_LVL=	3	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g301170m.evt / ad48001003g301170m.unf

Exposure: 0 / 0 kiloseconds
Events: 425 / 515 events
Count Rate: 13.281 / 16.094 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	1	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	1111111111111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g301270m.evt / ad48001003g301270m.unf

Exposure: 0 / 0 kiloseconds
Events: 1 / 512 events
Count Rate: 14.875 / 16 events per second

Selected FITS Keywords:

HV_RED=	OFF	/ HV-reduction on/off
HVH_LVL=	3	/ HV-High level (0 - 7)
HVL_LVL=	4	/ HV-Low level (0 - 7)
SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
X_AN_USE=	0011111011111111	/ X-anode use(1) or no-use(0) for X0 - X15
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

GIS3 PH mode event files with LOW bit rate

ad48001003g300370l.evt / ad48001003g300370l.unf

Exposure: 0.9 / 37.1 kiloseconds
Events: 3505 / 94328 events
Count Rate: 3.894 / 2.541 events per second

Selected FITS Keywords:

SP_A_L_P=	0	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	0	/ Spread discri B for POW2 method (0-255)
SP_C_P=	0	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	80	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	232	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	224	/ Spread discri B for FLF method (0-255)
SP_C_F=	0	/ Spread discri C for FLF method (0-255)
SP_PH_F=	0	/ Spread discri PH for FLF method (0-1023)

ad48001003g300470l.evt / ad48001003g300470l.unf

Exposure: 0.9 / 1.4 kiloseconds
Events: 3620 / 5172 events
Count Rate: 3.898 / 3.673 events per second

Selected FITS Keywords:

SP_A_L_P=	255	/ Spread discri A_L for POW2 method (0-255)
SP_B_P=	255	/ Spread discri B for POW2 method (0-255)
SP_C_P=	255	/ Spread discri C for POW2 method (0-255)
SP_A_L_F=	0	/ Spread discri A_L for FLF method (0-255)
SP_A_U_F=	0	/ Spread discri A_U for FLF method (0-255)
SP_B_F=	120	/ Spread discri B for FLF method (0-255)
SP_C_F=	120	/ Spread discri C for FLF method (0-255)
SP_PH_F=	31353	/ Spread discri PH for FLF method (0-1023)