GRB091112

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: Sun Jan 19 12:46:51 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger375659
======================================================================

  Trigger: 00375659      Segment: 000

  BAT Trigger Time: 279740486.336   [s; MET]
      Trigger Stop: 279740487.36   [s; MET]
               UTC: 2009-11-12T17:41:21.081480    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 257.727967798798   Dec: -36.7151372496385  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.23
     Image Trigger?:     NO
     Rate S/N Ratio:     15.1986841535707  [ if not an image trigger ]
     Image S/N Ratio:    7.23

  Analysis Position:   [ source = BAT ]
    RA: 257.727967798798   Dec: -36.7151372496385  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 257.752969681431   Dec: -36.7293968879752  [deg; J2000]  
        { 17h 11m 00.7s , -36d 43' 45.8" }
         +/- 1.4711721705858 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.545870116832465 [arcmin] (formal 1-sigma fit error)
    SNR: 17.5226220186232
 
  Angular difference between the analysis and refined position is 1.475735 arcmin
 
  Partial Coding Fraction: 0.4023438    [ including projection effects ]

  Duration
     T90: 17.5199999213219 +/- 3.84835811356733
        Measured from: -7.716000020504
                   to: 9.80399990081787     [s; relative to TRIGTIME]
     T50: 7.29999995231628 +/- 1.25232583975832
        Measured from: -2.49200004339218
                   to: 4.8079999089241     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.555999994277954     
                   to: 1.55599999427795     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -10.5     
                   to: 14.7439999580383     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.504238   0.853667   0.998664   0.497342
           0.061682   0.065435   0.062795   0.068612 [error]
 Peak      0.033321   0.072643   0.094053   0.048783
           0.012286   0.013534   0.013350   0.014105 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   25.244  -10.500   14.744
T90    17.520   -7.716    9.804
T50     7.300   -2.492    4.808
Peak    1.000    0.556    1.556
 
 
====== 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      -1.020    -0.135      0.138       -           -               -         7.71e-03     -5.69e-04          5.67e-04      54.150   57
CPL     -0.933    -0.211      0.489      721.564    -721.564      -721.564      8.40e-03     -1.22e-03          4.90e-03      54.200   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      -0.911     -0.319     0.340       -           -               -         1.62e-02     -2.97e-03          2.92e-03      42.480   57
CPL     -0.680     -0.529     1.288      344.723    -344.723      -344.723      2.03e-02     -6.43e-03          4.28e-02      42.490   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   1.59e-07  3.92e-07  7.73e-07  3.79e-06  2.09e-06  5.11e-06   erg/cm2
      90%_error_low -2.46e-08 -3.66e-08 -6.18e-08 -6.79e-07 -1.62e-07 -7.09e-07   erg/cm2
      90%_error_hi   2.61e-08  3.61e-08  6.14e-08  7.85e-07  1.62e-07  8.02e-07   erg/cm2
Peak flux       PL   3.81e-01  5.46e-01  5.80e-01  1.14e+00  1.86e+00  2.65e+00   ph/cm2/s
      90%_error_low -1.40e-01 -1.32e-01 -1.07e-01 -4.12e-01 -3.38e-01 -5.01e-01   ph/cm2/s
      90%_error_hi   1.63e-01  1.29e-01  1.06e-01  5.56e-01  3.41e-01  5.41e-01   ph/cm2/s
 
Fluence        CPL   1.62e-07  4.04e-07  7.76e-07  3.84e-06  2.09e-06  4.81e-06   erg/cm2
      90%_error_low -3.97e-08 -3.55e-08 -6.33e-08 -1.97e-06 -1.71e-07 -1.59e-06   erg/cm2
      90%_error_hi   1.67e-08  2.89e-08  7.39e-08  3.68e-07  1.62e-07  4.88e-07   erg/cm2
Peak flux      CPL   3.69e-01  5.47e-01  5.88e-01  1.03e+00  1.85e+00  2.53e+00   ph/cm2/s
      90%_error_low -1.83e-01 -1.34e-01 -1.13e-01 -1.03e+00 -3.53e-01 -8.09e-01   ph/cm2/s
      90%_error_hi   1.31e-01  1.34e-01  1.36e-01  4.17e-01  3.47e-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
  257.7530   -36.7294   0.0110    39.3393  -139.8618         3.1261913     17.523 TRIG_00375659                 
 
Foreground time interval of the image:
-10.500  14.744 (delta_t =  25.244 [sec])
Background time interval of the image:
-41.035 -10.500 (delta_t =  30.535 [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  -10.500 sec. to   14.744 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01969     ( -0.134648   0.137661 )
Norm@50keV  : 7.70640E-03    ( -0.000569144   0.000566529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.15 using 59 PHA bins.
# Reduced chi-squared =         0.9499 for     57 degrees of freedom 
# Null hypothesis probability =   5.828107e-01
 
Photon flux (15-150 keV)    in 25.24 sec: 0.888226 ( -0.067432  0.067767 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.08905e-06 ( -1.6153e-07  1.62331e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -10.500 sec. to   14.744 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01386     ( -0.205843   0.494711 )
Epeak [keV] : 9998.17      ( -9998.16 -9998.16 )
Norm@50keV  : 7.75136E-03    ( -0.000563401   0.00554889 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.15 using 59 PHA bins.
# Reduced chi-squared =         0.9669 for     56 degrees of freedom 
# Null hypothesis probability =   5.453782e-01
 
Photon flux (15-150 keV)    in 25.24 sec: 0.888008 ( -0.071993  0.067231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.08823e-06 ( -1.71379e-07  1.61853e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.556 sec. to    1.556 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.911181     ( -0.318817   0.340002 )
Norm@50keV  : 1.62362E-02    ( -0.00297149   0.00291967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.48 using 59 PHA bins.
# Reduced chi-squared =         0.7453 for     57 degrees of freedom 
# Null hypothesis probability =   9.239103e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.86377 ( -0.33846  0.34073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81447e-07 ( -3.37846e-08  3.40395e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.556 sec. to    1.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.775785     ( -0.517848   1.29996 )
Epeak [keV] : 534.142      ( -375.594 -375.594 )
Norm@50keV  : 1.84828E-02    ( -0.0043832   0.0448029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.46 using 59 PHA bins.
# Reduced chi-squared =         0.7583 for     56 degrees of freedom 
# Null hypothesis probability =   9.090887e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.85420 ( -0.35338  0.34713 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.80697e-07 ( -3.52851e-08  3.46159e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 17.52 sec.
Hardness ratio (energy fluence ratio) = 1.97287661949

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

S(15-50 keV)  = 5.5061e-07
S(50-150 keV) = 1.5384386e-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 = -6.266061842258196E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -41.035410 -10.500000

# RAcent #  [deg] 244.9630 -15.5859 254.5525  35.5355 255.8280 -37.8862 256.6136 -36.4882 263.0589 -24.8463 264.9089 -44.4360 268.4922  -1.2817 270.1108 -24.9465 270.1349 -25.6982 274.1241 -13.8695 276.0758 -30.3256 284.9790 -24.8028 288.8211  11.0981 299.4558  35.1319 263.1634 -33.9712 285.3274 -62.2923 281.5412 -61.1153 267.9934 -22.3322

Pre-slew

 Time interval of the image: -10.500000 14.744000

# RAcent #  [deg] 245.1230 -15.5303 254.4026  35.2561 255.9903 -37.9811 256.6207 -36.5253 263.1653 -24.7286 264.6207 -44.4172 268.3395  -1.3707 270.3449 -25.0747 270.1846 -25.8749 274.0267 -14.1833 275.7391 -30.2497 284.9124 -25.0731 288.7736  10.7926 299.5316  35.0912 262.8412 -33.9119 312.0536 -39.7420 268.9398  44.4911 276.5337  -4.4967 263.8886 -22.2823 257.7530 -36.7294

Post-slew

 Time interval of the image: -60.336000 482.711700

# RAcent #  [deg] 244.9580 -15.6219 254.5710  35.4496 255.8434 -37.9649 256.2989 -36.5284 263.0229 -24.8863 264.6822 -44.3045 268.4644  -1.2864 270.3577 -25.1873 270.1461 -25.7571 274.1309 -13.8683 276.0927 -30.4015 285.0748 -25.0665 288.7188  10.9438 299.5077  35.1464 263.1819 -33.9785 277.1293 -30.7361 279.0789 -60.0810 237.6939  18.5867

IMY = 5.283662211896585E-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] ['] 2.4 37.4 -100.8 1.8349 4.8 3.4 Sco X-1 0.0 46.5 -19.9 0.2354 0.9 12.5 Her X-1 9.3 41.2 -139.2 0.3199 1.2 7.9 4U 1700-377 8.6 39.7 -138.5 -0.3038 -1.3 9.4 GX 349+2 6.3 27.3 -132.2 0.3151 1.8 6.6 GX 1+4 7.8 43.1 -153.0 -0.3673 -1.5 7.2 4U 1735-44 0.0 12.8 -69.2 0.2590 1.6 12.7 SW J1753.5-0127 15.0 23.7 -144.5 -0.1180 -0.8 12.3 GX 5-1 31.5 24.3 -145.4 0.0542 0.4 9.4 GRS 1758-258 7.5 12.2 -136.3 0.2196 1.5 12.2 GX 17+2 8.4 27.0 -160.4 0.2276 1.4 8.2 H1820-303 6.9 21.4 -179.7 -0.2671 -1.7 7.7 HT1900.1-2455 11.3 16.7 37.6 0.1674 1.0 9.3 GRS 1915+105 3.7 42.5 32.6 0.9892 3.1 7.8 Cyg X-1 238.6 34.5 -143.2 -0.0096 -0.0 11.9 GX 354-0 2.2 58.7 -172.2 4.6990 5.2 ------ UNKNOWN 2.7 57.4 -170.1 2.8686 4.2 ------ UNKNOWN 2.9 22.5 -136.8 0.6147 4.0 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 50.3 37.3 -100.8 -0.0574 -0.2 10.6 Sco X-1 5.6 46.3 -20.3 0.4054 2.0 5.8 Her X-1 22.9 41.2 -139.4 0.0972 0.5 8.2 4U 1700-377 4.1 39.8 -138.6 0.5172 2.8 10.8 GX 349+2 5.0 27.2 -132.2 -0.2833 -2.3 8.6 GX 1+4 4.8 43.2 -152.7 0.4493 2.4 5.6 4U 1735-44 8.7 12.9 -69.7 0.1379 1.3 5.2 SW J1753.5-0127 3.9 23.7 -145.1 0.3108 3.0 3.3 GX 5-1 7.7 24.5 -145.7 -0.1602 -1.5 10.2 GRS 1758-258 7.0 12.5 -136.8 -0.1615 -1.7 8.9 GX 17+2 143.3 27.0 -159.7 -0.0086 -0.1 11.9 H1820-303 7.9 21.7 -179.4 -0.1508 -1.5 11.4 HT1900.1-2455 10.8 16.4 38.0 0.1116 1.1 9.3 GRS 1915+105 4.4 42.5 32.7 0.6154 2.6 7.2 Cyg X-1 26.3 34.6 -142.7 -0.0625 -0.4 8.7 GX 354-0 2.2 45.6 156.5 1.2435 5.3 ------ UNKNOWN 2.1 49.4 -1.2 1.2224 5.4 ------ UNKNOWN 2.5 4.6 -89.7 0.4278 4.6 ------ UNKNOWN 2.1 24.9 -129.5 0.6361 5.5 ------ UNKNOWN 0.7 39.3 -139.9 3.1262 17.7 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 1.7 37.4 -100.8 34.2855 6.9 1.7 Sco X-1 13.1 46.4 -19.9 3.3478 0.9 8.5 Her X-1 9.2 41.2 -139.2 4.4916 1.3 9.9 4U 1700-377 104.1 39.9 -138.2 0.3569 0.1 9.1 GX 349+2 7.8 27.3 -132.1 3.2951 1.5 8.5 GX 1+4 11.5 43.0 -152.6 3.4076 1.0 9.1 4U 1735-44 4.1 12.8 -69.0 6.0063 2.8 11.5 SW J1753.5-0127 6.3 23.8 -145.2 3.7175 1.8 7.6 GX 5-1 14.2 24.4 -145.4 1.6368 0.8 8.5 GRS 1758-258 0.0 12.2 -136.2 4.2230 2.3 12.4 GX 17+2 6.1 27.0 -160.4 4.1100 1.9 8.9 H1820-303 24.3 21.7 -179.8 -1.0822 -0.5 9.0 HT1900.1-2455 5.0 16.6 37.6 5.1186 2.3 4.7 GRS 1915+105 2.9 42.6 32.7 17.0117 3.9 5.2 Cyg X-1 0.0 34.5 -143.1 1.0770 0.4 12.9 GX 354-0 3.1 27.2 -162.4 7.8219 3.7 ------ UNKNOWN 3.0 56.3 -168.6 34.9028 3.9 ------ UNKNOWN 2.9 48.2 -50.6 36.0743 4.0 ------ 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