GRB060926

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 13:15:10 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger231231
======================================================================

  Trigger: 00231231      Segment: 000

  BAT Trigger Time: 180982123.328   [s; MET]
      Trigger Stop: 180982124.352   [s; MET]
               UTC: 2006-09-26T16:48:41.859180    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 263.955245477458   Dec: 13.0414075589345  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.6
     Image Trigger?:     NO
     Rate S/N Ratio:     17.3205080756888  [ if not an image trigger ]
     Image S/N Ratio:    11.6

  Analysis Position:   [ source = BAT ]
    RA: 263.955245477458   Dec: 13.0414075589345  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 263.928934805326   Dec: 13.0422658835586  [deg; J2000]  
        { 17h 35m 42.9s , +13d 02' 32.2" }
         +/- 1.42696934880024 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.637909972148018 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3031580771225
 
  Angular difference between the analysis and refined position is 1.538782 arcmin
 
  Partial Coding Fraction: 0.9453125    [ including projection effects ]

  Duration
     T90: 8.824000030756 +/- 1.14368001356697
        Measured from: 0.223999977111816
                   to: 9.04800000786781     [s; relative to TRIGTIME]
     T50: 3.69200003147125 +/- 1.23596762645632
        Measured from: 1.04799997806549
                   to: 4.74000000953674     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.368000000715256     
                   to: 1.36800000071526     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0920000076293945     
                   to: 10.1399999856949     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.262661   0.203630   0.066149   0.027128
           0.018580   0.017095   0.014054   0.011855 [error]
 Peak      0.061602   0.052941   0.016219   0.005646
           0.006173   0.005624   0.004578   0.003812 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   10.232   -0.092   10.140
T90     8.824    0.224    9.048
T50     3.692    1.048    4.740
Peak    1.000    0.368    1.368
 
 
====== 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      -2.497    -0.229      0.213       -           -               -         2.27e-03     -3.63e-04          3.60e-04      38.410   57
CPL     -1.934     N/A        N/A           4.207      N/A           N/A         5.13e-03        N/A               N/A         38.630   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      -2.380     -0.268     0.247       -           -               -         6.03e-03     -1.16e-03          1.15e-03      51.510   57
CPL     -1.272     -0.725     1.817       22.587      N/A           N/A         3.15e-02        N/A               N/A         49.330   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   7.64e-08  7.70e-08  5.46e-08  6.15e-08  2.32e-07  2.70e-07   erg/cm2
      90%_error_low -9.63e-09 -8.27e-09 -1.16e-08 -2.20e-08 -2.68e-08 -3.93e-08   erg/cm2
      90%_error_hi   9.78e-09  8.13e-09  1.24e-08  2.96e-08  2.77e-08  4.47e-08   erg/cm2
Peak flux       PL   5.82e-01  3.50e-01  1.35e-01  6.91e-02  1.10e+00  1.14e+00   ph/cm2/s
      90%_error_low -9.27e-02 -4.61e-02 -3.29e-02 -2.69e-02 -1.36e-01 -1.41e-01   ph/cm2/s
      90%_error_hi   9.45e-02  4.56e-02  3.49e-02  3.66e-02  1.36e-01  1.41e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -9.63e-09 -8.27e-09 -1.16e-08 -2.20e-08 -2.68e-08 -3.93e-08   erg/cm2
      90%_error_hi   9.78e-09  8.13e-09  1.24e-08  2.96e-08  2.77e-08  4.47e-08   erg/cm2
Peak flux      CPL   5.58e-01  3.90e-01  1.10e-01  1.21e-02  1.07e+00  1.07e+00   ph/cm2/s
      90%_error_low -1.01e-01 -6.30e-02 -5.20e-02     N/A   -1.39e-01 -1.40e-01   ph/cm2/s
      90%_error_hi   1.00e-01  6.63e-02  4.76e-02     N/A    1.41e-01  1.47e-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
  263.9289    13.0423   0.0105     9.0780    98.0474         0.5755504     18.303 TRIG_00231231                 
 
Foreground time interval of the image:
 -0.092  10.140 (delta_t =  10.232 [sec])
Background time interval of the image:
-239.328  -0.092 (delta_t = 239.236 [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   -0.092 sec. to   10.140 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.49681     ( -0.229232   0.213116 )
Norm@50keV  : 2.27213E-03    ( -0.000362901   0.000359504 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.41 using 59 PHA bins.
# Reduced chi-squared =         0.6738 for     57 degrees of freedom 
# Null hypothesis probability =   9.721502e-01
 
Photon flux (15-150 keV)    in 10.23 sec: 0.445552 ( -0.04269  0.042682 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32287e-07 ( -2.68377e-08  2.769e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.092 sec. to   10.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.93383     (       )
Epeak [keV] : 4.20687      (   )
Norm@50keV  : 5.13149E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.63 using 59 PHA bins.
# Reduced chi-squared =         0.6899 for     56 degrees of freedom 
# Null hypothesis probability =   9.628723e-01
 
Photon flux (15-150 keV)    in 10.23 sec: 0.436200 ( -0.04197  0.041329 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.368 sec. to    1.368 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.37986     ( -0.26804   0.246672 )
Norm@50keV  : 6.02994E-03    ( -0.00115824   0.00114505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.51 using 59 PHA bins.
# Reduced chi-squared =         0.9037 for     57 degrees of freedom 
# Null hypothesis probability =   6.803699e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.10281 ( -0.136019  0.13603 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.85693e-08 ( -8.79674e-09  9.10753e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.368 sec. to    1.368 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.27188     ( -0.726228   1.81645 )
Epeak [keV] : 22.5872      (   )
Norm@50keV  : 3.14527E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.33 using 59 PHA bins.
# Reduced chi-squared =         0.8809 for     56 degrees of freedom 
# Null hypothesis probability =   7.235977e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.06817 ( -0.13925  0.14064 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 8.824 sec.
Hardness ratio (energy fluence ratio) = 0.708712326178

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

S(15-50 keV)  = 1.5345441e-07
S(50-150 keV) = 7.883524e-08

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 = -2.236794455097446E-02,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.328000 -0.092000

# RAcent #  [deg] 244.9743 -15.6390 254.2773  35.3571 255.9812 -37.8368 256.5301 -36.4529 263.0999 -24.7496 264.8316 -44.3870 268.3911  -1.3899 270.2642 -25.1202 270.3100 -25.8667 273.9546 -14.0514 276.0162 -30.2328 284.9648 -25.1067 288.8074  10.9169 262.9786 -33.8603 274.6850  49.8332 242.3214   7.1518 201.0634  46.4350 216.8093  -4.1364

Pre-slew

 Time interval of the image: -0.092000 10.140000

# RAcent #  [deg] 245.1116 -15.7655 254.5779  35.5170 255.9703 -37.8212 256.6233 -36.5472 262.9664 -24.8190 264.7632 -44.4635 268.3577  -1.4905 270.3991 -25.0165 270.3964 -25.5988 274.1452 -14.0534 276.0038 -30.4998 285.0721 -24.8114 288.7125  10.8617 262.8403 -33.7815 291.8355  -2.3888 263.9289  13.0423

Post-slew

 Time interval of the image: 43.772620 875.972600

# RAcent #  [deg] 244.9831 -15.6442 254.3161  35.3208 256.0052 -37.8557 256.4614 -36.5106 263.0485 -24.7169 264.8570 -44.4511 268.3236  -1.3586 270.2837 -25.0814 270.2966 -25.7398 273.9286 -14.0279 275.7966 -30.2335 285.0102 -25.0211 288.7877  10.9525 299.5832  35.2066 262.9594 -33.8718 277.3766 -23.7918 242.8039  53.9567 243.2989  52.1869 226.8433 -12.5235 223.8687   2.3733

IMY = -1.582073322667724E-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] ['] 0.2 29.6 -147.5 10.9997 49.6 0.3 Sco X-1 4.1 23.0 12.6 0.5384 2.8 8.9 Her X-1 3.4 50.2 -168.0 1.6443 3.3 0.5 4U 1700-377 5.0 48.8 -168.6 1.0097 2.3 4.9 GX 349+2 2.2 38.0 -179.1 1.4811 5.4 5.0 GX 1+4 9.6 57.5 -175.2 1.2592 1.2 5.4 4U 1735-44 3.4 19.4 147.6 0.6455 3.4 4.0 SW J1753.5-0127 3.2 40.5 171.3 1.0815 3.6 2.7 GX 5-1 8.4 41.2 171.7 0.4325 1.4 7.4 GRS 1758-258 10.1 32.6 156.9 0.3255 1.1 3.1 GX 17+2 6.4 47.3 168.0 0.9194 1.8 9.3 H1820-303 16.2 47.7 155.2 0.4484 0.7 11.8 HT1900.1-2455 1.1 33.5 102.2 4.4665 10.4 1.8 GRS 1915+105 6.6 46.9 -176.1 0.6626 1.8 1.6 GX 354-0 2.4 40.9 33.1 2.0550 4.9 ------ UNKNOWN 3.0 13.2 -98.7 0.7833 3.8 ------ UNKNOWN 5.2 56.3 -28.4 2.7586 2.2 ------ UNKNOWN 5.6 41.1 -98.0 2.4431 2.1 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.9 29.7 -147.8 -0.0860 -2.4 10.7 Sco X-1 0.0 23.2 13.2 0.0452 1.3 12.0 Her X-1 695.0 50.2 -168.0 -0.0012 -0.0 1.6 4U 1700-377 0.0 48.9 -168.7 0.1235 1.7 11.7 GX 349+2 107.5 38.1 -178.9 -0.0049 -0.1 5.0 GX 1+4 5.7 57.6 -175.2 -0.3597 -2.0 1.2 4U 1735-44 6.4 19.4 147.9 -0.0599 -1.8 2.4 SW J1753.5-0127 10.9 40.4 171.1 0.0517 1.1 7.3 GX 5-1 3.2 40.9 171.4 0.1828 3.6 10.0 GRS 1758-258 10.7 32.7 156.6 0.0470 1.1 8.2 GX 17+2 3.0 47.5 168.2 -0.2924 -3.9 9.0 H1820-303 4.1 47.6 154.9 -0.2929 -2.8 6.8 HT1900.1-2455 5.1 33.4 102.3 -0.1572 -2.3 7.1 GRS 1915+105 16.9 46.8 -176.0 -0.0402 -0.7 8.1 GX 354-0 2.2 39.8 122.6 0.5122 5.3 ------ UNKNOWN 0.6 9.1 98.0 0.5756 18.3 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.2 34.3 -142.8 37.0285 47.7 0.3 Sco X-1 3.0 23.9 -16.2 2.0921 3.8 7.0 Her X-1 4.5 51.5 -168.5 4.3000 2.6 1.1 4U 1700-377 23.0 50.1 -168.7 0.6865 0.5 5.4 GX 349+2 2.5 37.8 -175.2 3.7677 4.6 2.8 GX 1+4 8.6 57.5 -177.3 -4.1665 -1.3 4.9 4U 1735-44 2.6 15.1 166.4 2.3727 4.4 6.2 SW J1753.5-0127 2.3 38.6 174.3 3.8547 5.0 0.1 GX 5-1 6.0 39.3 174.4 1.4372 1.9 0.4 GRS 1758-258 3.9 28.8 163.1 1.9651 3.0 4.5 GX 17+2 0.0 44.8 168.9 -1.3544 -1.2 10.4 H1820-303 4.9 43.3 155.1 3.2143 2.4 6.2 HT1900.1-2455 0.6 24.4 95.8 14.6205 18.1 0.8 GRS 1915+105 0.4 39.0 52.7 44.1743 32.2 0.5 Cyg X-1 4.8 46.9 -175.4 2.3610 2.4 2.7 GX 354-0 2.9 39.1 163.8 3.8169 4.0 ------ UNKNOWN 2.7 44.2 -14.2 4.2861 4.2 ------ UNKNOWN 3.3 42.5 -15.2 3.3788 3.5 ------ UNKNOWN 3.1 44.8 -119.8 12.2431 3.8 ------ UNKNOWN 5.1 41.1 -98.1 8.9051 2.3 ------ 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

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