GRB050922C

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done using the HEASARC data.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Wed Jan 22 20:04:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger156467
======================================================================

  Trigger: 00156467      Segment: 000

  BAT Trigger Time: 149111750.144   [s; MET]
      Trigger Stop: 149111751.168   [s; MET]
               UTC: 2005-09-22T19:55:50.400700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 317.390673787551   Dec: -8.77177360830505  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    22.78
     Image Trigger?:     NO
     Rate S/N Ratio:     106.677082824757  [ if not an image trigger ]
     Image S/N Ratio:    22.78

  Analysis Position:   [ source = BAT ]
    RA: 317.390673787551   Dec: -8.77177360830505  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 317.3872254408   Dec: -8.76251539765766  [deg; J2000]  
        { 21h 09m 32.9s , -08d 45' 45.1" }
         +/- 0.679972630743099 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.199803507517951 [arcmin] (formal 1-sigma fit error)
    SNR: 52.7735529253484
 
  Angular difference between the analysis and refined position is 0.591934 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 4.55200001597404 +/- 0.448017870687082
        Measured from: -2.08399999141693
                   to: 2.46800002455711     [s; relative to TRIGTIME]
     T50: 1.4200000166893 +/- 0.0933809188437612
        Measured from: -0.407999992370605
                   to: 1.0120000243187     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0760000050067902     
                   to: 0.92399999499321     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.31599998474121     
                   to: 3.4839999973774     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.531671   0.894585   0.732055   0.225969
           0.020857   0.023376   0.021434   0.016176 [error]
 Peak      0.174968   0.334242   0.275743   0.091580
           0.009524   0.011640   0.011251   0.007795 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.800   -3.316    3.484
T90     4.552   -2.084    2.468
T50     1.420   -0.408    1.012
Peak    1.000   -0.076    0.924
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.357    -0.056      0.056       -           -               -         2.45e-02     -7.57e-04          7.57e-04      70.980   57
CPL     -1.126    -0.213      0.226      209.568     -76.969      1431.682      3.13e-02     -6.07e-03          8.24e-03      67.630   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.299     -0.070     0.070       -           -               -         6.04e-02     -2.48e-03          2.48e-03      69.860   57
CPL     -0.890     -0.275     0.293      146.483     -40.006       174.475      9.46e-02     -2.40e-02          3.48e-02      63.190   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   1.86e-07  3.73e-07  5.83e-07  2.01e-06  1.62e-06  3.15e-06   erg/cm2
      90%_error_low -1.13e-08 -1.35e-08 -2.15e-08 -1.62e-07 -5.36e-08 -1.75e-07   erg/cm2
      90%_error_hi   1.15e-08  1.34e-08  2.14e-08  1.72e-07  5.36e-08  1.83e-07   erg/cm2
Peak flux       PL   2.05e+00  2.33e+00  1.89e+00  2.56e+00  7.20e+00  8.83e+00   ph/cm2/s
      90%_error_low -1.55e-01 -1.10e-01 -9.11e-02 -2.48e-01 -3.05e-01 -3.73e-01   ph/cm2/s
      90%_error_hi   1.59e-01  1.09e-01  9.06e-02  2.63e-01  3.05e-01  3.74e-01   ph/cm2/s
 
Fluence        CPL   1.76e-07  3.79e-07  5.96e-07  1.47e-06  1.60e-06  2.62e-06   erg/cm2
      90%_error_low -1.41e-08 -1.48e-08 -2.46e-08 -3.58e-07 -5.75e-08 -3.57e-07   erg/cm2
      90%_error_hi   1.44e-08  1.49e-08  2.48e-08  4.89e-07  5.73e-08  4.86e-07   erg/cm2
Peak flux      CPL   1.87e+00  2.40e+00  1.98e+00  1.69e+00  7.09e+00  7.94e+00   ph/cm2/s
      90%_error_low -1.88e-01 -1.23e-01 -1.09e-01 -4.00e-01 -3.14e-01 -5.15e-01   ph/cm2/s
      90%_error_hi   1.93e-01  1.24e-01  1.10e-01  5.43e-01  3.14e-01  6.12e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  317.3872    -8.7625   0.0036    34.5467   158.8477         2.5092686     52.774 TRIG_00156467                 
 
Foreground time interval of the image:
 -3.316   3.484 (delta_t =   6.800 [sec])
Background time interval of the image:
-51.843  -3.316 (delta_t =  48.527 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Spectra

Notes:

1) The fitting includes the systematic errors.
2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -3.316 sec. to    3.484 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.35664     ( -0.0557072   0.0558196 )
Norm@50keV  : 2.44893E-02    ( -0.000757394   0.000757376 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.98 using 59 PHA bins.
# Reduced chi-squared =          1.245 for     57 degrees of freedom 
# Null hypothesis probability =   1.008992e-01
 
Photon flux (15-150 keV)    in 6.8 sec: 2.95435 ( -0.09835  0.09854 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.62423e-06 ( -5.35501e-08  5.36379e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -3.316 sec. to    3.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.12628     ( -0.212862   0.226412 )
Epeak [keV] : 209.568      ( -76.9706 1431.68 )
Norm@50keV  : 3.12754E-02    ( -0.00607098   0.00824488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.63 using 59 PHA bins.
# Reduced chi-squared =          1.208 for     56 degrees of freedom 
# Null hypothesis probability =   1.371989e-01
 
Photon flux (15-150 keV)    in 6.8 sec: 2.91635 ( -0.104  0.10424 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60328e-06 ( -5.74924e-08  5.72616e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.076 sec. to    0.924 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29912     ( -0.0696745   0.0696675 )
Norm@50keV  : 6.03769E-02    ( -0.00247541   0.00247517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.86 using 59 PHA bins.
# Reduced chi-squared =          1.226 for     57 degrees of freedom 
# Null hypothesis probability =   1.178458e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.20203 ( -0.30509  0.30536 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.96829e-07 ( -2.68747e-08  2.69489e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.076 sec. to    0.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.889571     ( -0.274956   0.293392 )
Epeak [keV] : 146.483      ( -40.006 174.475 )
Norm@50keV  : 9.45512E-02    ( -0.0240426   0.0348189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.19 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     56 degrees of freedom 
# Null hypothesis probability =   2.373631e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.08802 ( -0.31383  0.31405 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.84346e-07 ( -2.87233e-08  2.85545e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 4.552 sec.
Hardness ratio (energy fluence ratio) = 1.56199642582

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 5.589383e-07
S(50-150 keV) = 1.0652844e-06

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

 IMX = -6.420951896159968E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -51.843410 -3.316000

# RAcent #  [deg] 288.8513  11.0461 299.6241  35.2224 307.9639  40.8999 325.9388  38.3711 23.8111   4.4776 303.3412 -23.4899 340.5935  36.8177

Pre-slew

 Time interval of the image: -3.316000 3.484000

# RAcent #  [deg] 288.8074  11.1652 299.7005  35.2618 308.2089  40.8109 325.9115  38.3548 335.9986  -3.3706 317.3872  -8.7625 291.2812 -15.1650 289.1272 -12.3933

Post-slew

 Time interval of the image: 94.756600 302.973400

# RAcent #  [deg] 285.0209 -25.0044 288.8113  10.9722 299.5849  35.2084 308.0889  40.9687 326.1954  38.3508 336.2902  34.1671 308.4031  25.2698 301.1025  35.2884 302.7724 -31.4891 291.5370 -20.2617 278.0801 -49.1705

IMY = -2.484374243543705E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.8 47.5 -150.8 0.2107 1.5 6.8 GRS 1915+105 0.9 36.8 -114.8 1.5580 12.3 2.1 Cyg X-1 4.7 33.0 -101.1 0.2546 2.4 7.3 Cyg X-3 8.9 21.3 -83.5 0.0962 1.3 11.4 Cyg X-2 2.4 47.6 44.4 1.3237 4.8 ------ UNKNOWN 2.4 54.4 161.3 1.6638 4.9 ------ UNKNOWN 2.0 17.5 -49.6 0.3582 5.7 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.0 47.5 -150.6 -0.0604 -0.8 13.2 GRS 1915+105 9.7 36.7 -114.7 0.0713 1.2 6.5 Cyg X-1 6.1 32.8 -101.1 -0.1028 -1.9 9.6 Cyg X-3 0.0 21.3 -83.5 -0.0969 -2.7 12.4 Cyg X-2 2.1 23.0 125.9 0.2083 5.4 ------ UNKNOWN 0.2 34.5 158.8 2.5092 52.8 ------ UNKNOWN 3.1 57.2 178.1 0.8184 3.8 ------ UNKNOWN 2.1 57.3 -177.8 1.0875 5.5 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 7.1 34.8 -112.4 0.4187 1.6 5.1 HT1900.1-2455 1.1 34.6 -46.3 2.1981 10.5 1.8 GRS 1915+105 0.5 47.1 -10.5 6.7223 23.6 0.5 Cyg X-1 3.2 50.5 0.4 1.3054 3.6 1.4 Cyg X-3 22.7 47.8 18.8 0.2055 0.5 2.1 Cyg X-2 2.7 46.5 31.2 1.7465 4.3 ------ UNKNOWN 3.5 35.1 -4.7 0.6036 3.3 ------ UNKNOWN 2.2 46.6 -8.9 1.3735 5.2 ------ UNKNOWN 2.7 26.5 -141.8 0.6633 4.3 ------ UNKNOWN 2.6 27.4 -108.2 0.8122 4.5 ------ UNKNOWN 2.8 52.0 -138.9 3.2274 4.1 ------ UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 15.0-350.0 keV image (Event data)

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

Mask shadow pattern

Spacecraft aspect plot

Bright

Pre-burst Time interval of the image: -51.843410 -3.316000 # RAcent # [deg] 288.8513 11.0461 299.6241 35.2224 307.9639 40.8999 325.9388 38.3711 23.8111 4.4776 303.3412 -23.4899 340.5935 36.8177

Pre-slew Time interval of the image: -3.316000 3.484000 # RAcent # [deg] 288.8074 11.1652 299.7005 35.2618 308.2089 40.8109 325.9115 38.3548 335.9986 -3.3706 317.3872 -8.7625 291.2812 -15.1650 289.1272 -12.3933

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

Pre-burst
Time interval of the image: -51.843410 -3.316000 # RAcent # [deg] 288.8513 11.0461 299.6241 35.2224 307.9639 40.8999 325.9388 38.3711 23.8111 4.4776 303.3412 -23.4899 340.5935 36.8177

Pre-slew
Time interval of the image: -3.316000 3.484000 # RAcent # [deg] 288.8074 11.1652 299.7005 35.2618 308.2089 40.8109 325.9115 38.3548 335.9986 -3.3706 317.3872 -8.7625 291.2812 -15.1650 289.1272 -12.3933