GRB070913

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: Mon Jan 20 07:26:05 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger290843
======================================================================

  Trigger: 00290843      Segment: 000

  BAT Trigger Time: 211336606.208   [s; MET]
      Trigger Stop: 211336607.232   [s; MET]
               UTC: 2007-09-13T00:36:43.987920    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 228.831779421729   Dec: -24.3419572889613  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.63
     Image Trigger?:     NO
     Rate S/N Ratio:     14.422205101856  [ if not an image trigger ]
     Image S/N Ratio:    9.63

  Analysis Position:   [ source = BAT ]
    RA: 228.831779421729   Dec: -24.3419572889613  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 228.735789482905   Dec: -24.2788796947602  [deg; J2000]  
        { 15h 14m 56.6s , -24d 16' 44.0" }
         +/- 1.76794997358706 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.835902820981109 [arcmin] (formal 1-sigma fit error)
    SNR: 13.4768951213991
 
  Angular difference between the analysis and refined position is 6.470895 arcmin
 
  Partial Coding Fraction: 0.515625    [ including projection effects ]

  Duration
     T90: 2.68399998545647 +/- 0.563560121493796
        Measured from: -1.49599999189377
                   to: 1.1879999935627     [s; relative to TRIGTIME]
     T50: 1.2320000231266 +/- 0.597836080778623
        Measured from: -0.636000007390976
                   to: 0.596000015735626     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.259999990463257     
                   to: 0.740000009536743     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.58399999141693     
                   to: 1.29199999570847     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.058998   0.104919   0.072394   0.004227
           0.012905   0.013842   0.012120   0.010087 [error]
 Peak      0.018164   0.045856   0.029994   0.011696
           0.007682   0.008285   0.007253   0.005851 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    2.876   -1.584    1.292
T90     2.684   -1.496    1.188
T50     1.232   -0.636    0.596
Peak    1.000   -0.260    0.740
 
 
====== 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      -1.412    -0.239      0.241       -           -               -         6.11e-03     -9.46e-04          9.45e-04      67.490   57
CPL      0.723    -1.402      2.144       62.314     -11.620        30.598      7.44e-02     -7.44e-02          8.19e-01      59.500   56
 
 
=== 1-s peak 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      -1.264     -0.336     0.350       -           -               -         7.54e-03     -1.62e-03          1.62e-03      66.560   57
CPL      0.178     -1.545     2.809       78.556     -24.926       -78.556      3.80e-02     -3.80e-02          9.00e-01      64.180   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   2.07e-08  4.01e-08  6.02e-08  1.96e-07  1.69e-07  3.17e-07   erg/cm2
      90%_error_low -5.16e-09 -6.71e-09 -1.11e-08 -6.55e-08 -2.79e-08 -7.62e-08   erg/cm2
      90%_error_hi   5.52e-09  6.65e-09  1.11e-08  8.40e-08  2.82e-08  9.07e-08   erg/cm2
Peak flux       PL   2.47e-01  2.87e-01  2.39e-01  3.35e-01  8.93e-01  1.11e+00   ph/cm2/s
      90%_error_low -9.21e-02 -7.35e-02 -5.64e-02 -1.35e-01 -2.01e-01 -2.39e-01   ph/cm2/s
      90%_error_hi   1.04e-01  7.21e-02  5.57e-02  1.81e-01  2.03e-01  2.41e-01   ph/cm2/s
 
Fluence        CPL   1.46e-08  4.90e-08  6.55e-08  2.38e-08  1.48e-07  1.53e-07   erg/cm2
      90%_error_low -6.12e-09 -9.21e-09 -1.53e-08 -1.85e-08 -2.98e-08 -3.40e-08   erg/cm2
      90%_error_hi   6.62e-09  9.85e-09  1.43e-08  5.55e-08  3.15e-08  5.82e-08   erg/cm2
Peak flux      CPL   1.85e-01  3.23e-01  2.72e-01  1.02e-01  8.55e-01  8.82e-01   ph/cm2/s
      90%_error_low -1.03e-01 -8.93e-02 -6.92e-02 -1.02e-01 -2.05e-01 -2.26e-01   ph/cm2/s
      90%_error_hi   1.22e-01  9.75e-02  7.21e-02  2.87e-01  2.07e-01  3.11e-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
  228.7358   -24.2789   0.0142    41.8157    -8.4833         0.3389504     13.477 TRIG_00290843                 
 
Foreground time interval of the image:
 -1.584   1.292 (delta_t =   2.876 [sec])
Background time interval of the image:
-239.208  -1.584 (delta_t = 237.624 [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   -1.584 sec. to    1.292 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.41195     ( -0.239301   0.240885 )
Norm@50keV  : 6.11105E-03    ( -0.0009461   0.000945247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.49 using 59 PHA bins.
# Reduced chi-squared =          1.184 for     57 degrees of freedom 
# Null hypothesis probability =   1.612000e-01
 
Photon flux (15-150 keV)    in 2.876 sec: 0.746287 ( -0.118869  0.119357 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.69429e-07 ( -2.79417e-08  2.81805e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.584 sec. to    1.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.723383     ( -1.40284   2.14267 )
Epeak [keV] : 62.3144      ( -11.6074 30.6097 )
Norm@50keV  : 7.43540E-02    ( -0.0744818   0.819121 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.50 using 59 PHA bins.
# Reduced chi-squared =          1.062 for     56 degrees of freedom 
# Null hypothesis probability =   3.494976e-01
 
Photon flux (15-150 keV)    in 2.876 sec: 0.695310 ( -0.123763  0.124259 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48176e-07 ( -2.98017e-08  3.15158e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.260 sec. to    0.740 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.26371     ( -0.336012   0.350505 )
Norm@50keV  : 7.53603E-03    ( -0.00161782   0.00161598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.56 using 59 PHA bins.
# Reduced chi-squared =          1.168 for     57 degrees of freedom 
# Null hypothesis probability =   1.809910e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.893367 ( -0.20095  0.202653 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.51571e-08 ( -1.68395e-08  1.69472e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.260 sec. to    0.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.177896     ( -1.54554   2.80922 )
Epeak [keV] : 78.5563      ( -24.9241 -78.5543 )
Norm@50keV  : 3.80256E-02    ( -0.0380299   0.900446 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.18 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     56 degrees of freedom 
# Null hypothesis probability =   2.118110e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.854905 ( -0.205291  0.207295 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94832e-08 ( -1.90751e-08  1.86156e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 2.684 sec.
Hardness ratio (energy fluence ratio) = 1.50310643937

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

S(15-50 keV)  = 6.074445e-08
S(50-150 keV) = 1.0868749e-07

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 = 8.848086431628168E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.208000 -1.584000

# RAcent #  [deg] 135.5425 -40.5520 170.4916 -60.6249 186.7073 -62.8005 256.0428 -37.8634 256.3456 -36.5173 264.6514 -44.4767 99.9193 -56.8748 201.4098 -43.0386 211.8868 -33.3116 121.7310 -30.7616 165.2422 -32.5457 130.9138 -28.3742

Pre-slew

 Time interval of the image: -1.584000 1.292000

# RAcent #  [deg] 135.5175 -40.5586 170.1903 -60.5755 186.8259 -62.8478 256.1076 -38.0418 256.5248 -36.3911 264.5559 -44.3207 235.4082 -41.0435 228.7356 -24.2788 228.6402 -12.2886 171.4490 -19.7385

Post-slew

 Time interval of the image: 243.292590 962.837900

# RAcent #  [deg] 170.0962 -60.6520 186.7145 -62.7759 244.9817 -15.6414 255.9802 -37.8514 256.4609 -36.4264 263.0292 -24.7404 264.5371 -44.3962 270.1209 -24.9223 270.2215 -25.6089 274.0057 -14.0364 276.0717 -30.3714 263.0619 -33.8794 276.5792 -37.1902 218.4388  -6.6699 196.0402 -25.5216

IMY = 1.319718418351068E-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] ['] 1.7 38.2 -158.4 1.7570 6.9 0.7 Vela X-1 1.9 11.8 166.1 0.9002 6.1 5.2 Cen X-3 1.4 8.0 123.7 1.3142 8.1 2.3 GX 301-2 4.4 46.6 29.9 1.1979 2.6 2.9 4U 1700-377 6.0 47.7 28.8 1.0049 1.9 7.1 GX 349+2 5.6 47.0 42.6 1.4590 2.1 4.2 4U 1735-44 2.3 46.8 161.4 1.9470 4.9 ------ UNKNOWN 1.9 14.0 -30.7 0.9440 6.0 ------ UNKNOWN 2.0 26.5 -23.0 0.8877 5.7 ------ UNKNOWN 3.0 53.1 -159.6 1.8556 3.9 ------ UNKNOWN 2.2 28.4 -115.3 1.0707 5.2 ------ UNKNOWN 2.9 49.6 -149.9 1.5359 3.9 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 299.6 38.2 -158.4 0.0009 0.0 0.6 Vela X-1 4.0 11.9 166.6 0.0437 2.9 4.7 Cen X-3 6.4 8.1 123.3 0.0282 1.8 6.6 GX 301-2 0.0 46.5 30.1 -0.0382 -0.8 13.2 4U 1700-377 8.0 47.9 28.8 -0.0787 -1.5 4.7 GX 349+2 10.8 47.0 42.4 -0.0777 -1.1 11.2 4U 1735-44 2.2 32.7 16.8 0.1075 5.3 ------ UNKNOWN 0.9 41.8 -8.5 0.3389 13.5 ------ UNKNOWN 2.1 52.2 -16.7 0.2208 5.5 ------ UNKNOWN 2.0 37.9 -96.4 0.2515 5.7 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.6 32.9 -149.3 1.4427 2.5 6.7 Cen X-3 1.4 24.8 -149.9 4.0521 8.0 1.6 GX 301-2 0.3 40.9 -8.2 25.1070 40.2 0.1 Sco X-1 0.5 22.9 24.2 9.7718 23.2 0.5 4U 1700-377 1.7 24.4 23.2 3.1084 6.9 1.2 GX 349+2 2.3 37.3 22.0 3.2979 5.1 1.1 GX 1+4 6.8 22.1 48.2 0.8861 1.7 9.4 4U 1735-44 0.0 40.2 31.1 1.3469 1.7 12.9 GX 5-1 7.3 39.7 31.8 1.2378 1.6 9.2 GRS 1758-258 90.1 51.5 28.3 0.2656 0.1 0.0 GX 17+2 11.5 38.6 42.8 0.8167 1.0 7.6 H1820-303 16.4 29.4 30.3 -0.3482 -0.7 4.5 GX 354-0 2.7 33.7 50.8 2.9437 4.3 ------ UNKNOWN 3.8 50.7 -44.5 7.3366 3.1 ------ UNKNOWN 2.9 41.0 -82.5 9.3092 3.9 ------ 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: -239.208000 -1.584000 # RAcent # [deg] 135.5425 -40.5520 170.4916 -60.6249 186.7073 -62.8005 256.0428 -37.8634 256.3456 -36.5173 264.6514 -44.4767 99.9193 -56.8748 201.4098 -43.0386 211.8868 -33.3116 121.7310 -30.7616 165.2422 -32.5457 130.9138 -28.3742

Pre-slew Time interval of the image: -1.584000 1.292000 # RAcent # [deg] 135.5175 -40.5586 170.1903 -60.5755 186.8259 -62.8478 256.1076 -38.0418 256.5248 -36.3911 264.5559 -44.3207 235.4082 -41.0435 228.7356 -24.2788 228.6402 -12.2886 171.4490 -19.7385

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: -239.208000 -1.584000 # RAcent # [deg] 135.5425 -40.5520 170.4916 -60.6249 186.7073 -62.8005 256.0428 -37.8634 256.3456 -36.5173 264.6514 -44.4767 99.9193 -56.8748 201.4098 -43.0386 211.8868 -33.3116 121.7310 -30.7616 165.2422 -32.5457 130.9138 -28.3742

Pre-slew
Time interval of the image: -1.584000 1.292000 # RAcent # [deg] 135.5175 -40.5586 170.1903 -60.5755 186.8259 -62.8478 256.1076 -38.0418 256.5248 -36.3911 264.5559 -44.3207 235.4082 -41.0435 228.7356 -24.2788 228.6402 -12.2886 171.4490 -19.7385