GRB081104

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 20:54:18 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger333666
======================================================================

  Trigger: 00333666      Segment: 000

  BAT Trigger Time: 247484085.696   [s; MET]
      Trigger Stop: 247484093.888   [s; MET]
               UTC: 2008-11-04T09:34:42.467620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 100.485289941374   Dec: -54.7321618369165  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.32
     Image Trigger?:     NO
     Rate S/N Ratio:     6.70820393249937  [ if not an image trigger ]
     Image S/N Ratio:    9.32

  Analysis Position:   [ source = BAT ]
    RA: 100.485289941374   Dec: -54.7321618369165  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 100.498811005272   Dec: -54.7198364861277  [deg; J2000]  
        { 06h 41m 59.7s , -54d 43' 11.4" }
         +/- 1.3262778339297 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.607722226441068 [arcmin] (formal 1-sigma fit error)
    SNR: 20.3201177828557
 
  Angular difference between the analysis and refined position is 0.875430 arcmin
 
  Partial Coding Fraction: 0.3203125    [ including projection effects ]

  Duration
     T90: 64 +/- 15.2643375224737
        Measured from: -14.6960000097752
                   to: 49.3039999902248     [s; relative to TRIGTIME]
     T50: 23 +/- 5.3851648071345
        Measured from: 6.30399999022484
                   to: 29.3039999902248     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 20.3039999902248     
                   to: 21.3039999902248     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -23.6960000097752     
                   to: 57.3039999902248     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.171929   1.374217   0.762523   0.165470
           0.084961   0.089939   0.080511   0.075021 [error]
 Peak      0.039635   0.035506   0.034610   0.005506
           0.009764   0.010356   0.009336   0.008367 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   81.000  -23.696   57.304
T90    64.000  -14.696   49.304
T50    23.000    6.304   29.304
Peak    1.000   20.304   21.304
 
 
====== 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      -1.943    -0.144      0.140       -           -               -         2.82e-03     -2.53e-04          2.49e-04      51.830   57
CPL     -1.522    -0.534      0.615       51.218     -36.898       -51.218      4.79e-03     -2.30e-03          5.49e-03      50.060   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.852     -0.497     0.448       -           -               -         7.15e-03     -2.25e-03          2.17e-03      82.710   57
CPL     -0.918     -1.260     2.503       52.905     -52.758       -52.905      2.32e-02     -2.32e-02          5.32e-01      81.850   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   4.43e-07  6.22e-07  6.47e-07  1.24e-06  2.10e-06  2.95e-06   erg/cm2
      90%_error_low -5.13e-08 -4.77e-08 -7.84e-08 -2.79e-07 -1.82e-07 -3.64e-07   erg/cm2
      90%_error_hi   5.28e-08  4.77e-08  7.87e-08  3.28e-07  1.83e-07  3.99e-07   erg/cm2
Peak flux       PL   4.13e-01  3.38e-01  1.87e-01  1.53e-01  1.01e+00  1.09e+00   ph/cm2/s
      90%_error_low -1.58e-01 -9.25e-02 -7.30e-02 -9.02e-02 -2.76e-01 -2.97e-01   ph/cm2/s
      90%_error_hi   1.72e-01  9.23e-02  7.37e-02  1.41e-01  2.77e-01  2.98e-01   ph/cm2/s
 
Fluence        CPL   4.21e-07  6.52e-07  6.49e-07  6.34e-07  2.03e-06  2.36e-06   erg/cm2
      90%_error_low -5.94e-08 -6.10e-08 -8.47e-08 -3.50e-07 -2.03e-07 -4.14e-07   erg/cm2
      90%_error_hi   5.97e-08  6.27e-08  8.42e-08  7.07e-07  2.05e-07  7.59e-07   erg/cm2
Peak flux      CPL   3.67e-01  3.76e-01  1.96e-01  5.75e-02  9.81e-01  9.96e-01   ph/cm2/s
      90%_error_low -1.84e-01 -1.14e-01     N/A   -5.75e-02 -2.80e-01 -1.54e-01   ph/cm2/s
      90%_error_hi   1.92e-01  1.24e-01     N/A    1.39e-01  2.81e-01  3.25e-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
  100.4988   -54.7198   0.0095    47.8516  -177.4057         3.8681784     20.320 TRIG_00333666                 
 
Foreground time interval of the image:
-23.696  57.304 (delta_t =  81.000 [sec])
Background time interval of the image:
-239.696 -23.696 (delta_t = 216.000 [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  -23.696 sec. to   57.304 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.94346     ( -0.144434   0.139839 )
Norm@50keV  : 2.82002E-03    ( -0.000252574   0.000248823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.83 using 59 PHA bins.
# Reduced chi-squared =         0.9093 for     57 degrees of freedom 
# Null hypothesis probability =   6.687401e-01
 
Photon flux (15-150 keV)    in 81 sec: 0.412405 ( -0.032386  0.032432 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10206e-06 ( -1.81604e-07  1.83457e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -23.696 sec. to   57.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52236     ( -0.53424   0.615199 )
Epeak [keV] : 51.2183      ( -36.8976 -51.2183 )
Norm@50keV  : 4.79031E-03    ( -0.00229851   0.00549309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.06 using 59 PHA bins.
# Reduced chi-squared =         0.8938 for     56 degrees of freedom 
# Null hypothesis probability =   6.982349e-01
 
Photon flux (15-150 keV)    in 81 sec: 0.404741 ( -0.033874  0.033846 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.02948e-06 ( -2.03167e-07  2.04787e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   20.304 sec. to   21.304 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.85232     ( -0.497146   0.447713 )
Norm@50keV  : 7.15498E-03    ( -0.00225492   0.00216875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          82.71 using 59 PHA bins.
# Reduced chi-squared =          1.451 for     57 degrees of freedom 
# Null hypothesis probability =   1.464267e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.00671 ( -0.276222  0.2768 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.57991e-08 ( -2.0045e-08  2.06579e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   20.304 sec. to   21.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.917577     ( -1.2606   2.5027 )
Epeak [keV] : 52.9050      ( -52.7563 -52.9036 )
Norm@50keV  : 2.31522E-02    ( -0.0231551   0.532077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          81.85 using 59 PHA bins.
# Reduced chi-squared =          1.462 for     56 degrees of freedom 
# Null hypothesis probability =   1.373809e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.980824 ( -0.279731  0.280656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.21098e-08 ( -2.02198e-08  2.16778e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 64.0 sec.
Hardness ratio (energy fluence ratio) = 1.04001591806

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

S(15-50 keV)  = 1.0649669e-06
S(50-150 keV) = 1.0370921e-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 = -1.103713398757182E+00, IMY = 5.000866963813672E-02

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.696000 -23.696000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
264.5327 -44.4278    7.6  46.7  -55.5  -1.2743  -1.5    9.1	4U 1735-44                    
285.1473 -24.9264    7.9  56.5  -24.9  -1.0723  -1.5    6.1	HT1900.1-2455                 
322.3384 -16.0893    2.8  54.4   18.9   4.0364   4.2 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-23.696000 57.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
265.0034 -44.4183    5.1  46.5  -55.1   0.9956   2.3   11.3	4U 1735-44                    
284.9932 -25.0098    7.7  56.5  -25.1   0.6532   1.5    5.8	HT1900.1-2455                 
100.4988 -54.7198    0.6  47.9 -177.4   3.8683  20.3 ------	UNKNOWN                       
295.9070 -53.1007    2.2  27.9  -35.2   0.5550   5.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

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 source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Pre-slew background subtracted image of 15-350 keV band

Post-slew image of 15-350 keV band

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