GRB100725A: Summary Image Light curves Spectra Distribution Others

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: Fri Jan 17 17:22:37 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger429954
======================================================================

  Trigger: 00429954      Segment: 000

  BAT Trigger Time: 301734778.432   [s; MET]
      Trigger Stop: 301734779.456   [s; MET]
               UTC: 2010-07-25T07:12:52.414860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 166.514988339174   Dec: -26.6876315703796  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.66
     Image Trigger?:     NO
     Rate S/N Ratio:     24.6576560118759  [ if not an image trigger ]
     Image S/N Ratio:    6.66

  Analysis Position:   [ source = BAT ]
    RA: 166.514988339174   Dec: -26.6876315703796  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 166.465875297897   Dec: -26.666327278205  [deg; J2000]  
        { 11h 05m 51.8s , -26d 39' 58.8" }
         +/- 1.1913672336355 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.458338433275639 [arcmin] (formal 1-sigma fit error)
    SNR: 23.6854551671049
 
  Angular difference between the analysis and refined position is 2.926973 arcmin
 
  Partial Coding Fraction: 0.828125    [ including projection effects ]

  Duration
     T90: 123.239999949932 +/- 27.1530454699813
        Measured from: -0.251999974250793
                   to: 122.987999975681     [s; relative to TRIGTIME]
     T50: 53.4239999651909 +/- 9.74747249464766
        Measured from: 9.81999999284744
                   to: 63.2439999580383     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.58399999141693     
                   to: 9.58399999141693     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.56000000238419     
                   to: 167.624000012875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.664266   1.057696   0.966591   0.400808
           0.062682   0.064816   0.057708   0.050632 [error]
 Peak      0.015002   0.031822   0.027668   0.024240
           0.005326   0.005729   0.005381   0.004744 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  174.184   -6.560  167.624
T90   123.240   -0.252  122.988
T50    53.424    9.820   63.244
Peak    1.000    8.584    9.584
 
 
====== 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      -1.189    -0.118      0.119       -           -               -         1.16e-03     -7.26e-05          7.26e-05      50.590   57
CPL     -1.191    -0.113      0.143     9999.360    -9999.360      -9999.360      1.17e-03     -7.27e-05          2.53e-04      50.640   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      -1.086     -0.344     0.366       -           -               -         6.02e-03     -1.15e-03          1.14e-03      68.980   57
CPL     -1.092     -5.939     0.899     9999.320      N/A           N/A         6.04e-03        N/A               N/A         68.990   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   1.94e-07  4.31e-07  7.56e-07  3.10e-06  2.07e-06  4.48e-06   erg/cm2
      90%_error_low -2.47e-08 -3.25e-08 -5.61e-08 -5.08e-07 -1.41e-07 -5.40e-07   erg/cm2
      90%_error_hi   2.58e-08  3.21e-08  5.57e-08  5.78e-07  1.42e-07  6.00e-07   erg/cm2
Peak flux       PL   1.67e-01  2.15e-01  2.02e-01  3.37e-01  6.97e-01  9.21e-01   ph/cm2/s
      90%_error_low -6.25e-02 -5.24e-02 -4.33e-02 -1.35e-01 -1.37e-01 -1.84e-01   ph/cm2/s
      90%_error_hi   7.06e-02  5.03e-02  4.23e-02  1.88e-01  1.37e-01  1.94e-01   ph/cm2/s
 
Fluence        CPL   1.94e-07  4.28e-07  7.48e-07  3.12e-06  2.08e-06  4.25e-06   erg/cm2
      90%_error_low    N/A    -2.95e-08 -4.76e-08 -9.57e-07 -1.53e-07 -7.25e-07   erg/cm2
      90%_error_hi     N/A     3.51e-08  6.43e-08  2.25e-07  1.30e-07  8.25e-07   erg/cm2
Peak flux      CPL   1.72e-01  2.15e-01  2.01e-01  3.40e-01  7.02e-01  9.24e-01   ph/cm2/s
      90%_error_low     N/A   -5.30e-02 -4.25e-02     N/A   -1.62e-01 -2.64e-01   ph/cm2/s
      90%_error_hi      N/A    5.01e-02  4.58e-02     N/A    1.53e-01  1.71e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  166.4659   -26.6663   0.0081    30.6737  -157.7026         1.2077689     23.685 TRIG_00429954                 
 
Foreground time interval of the image:
 -6.560  15.069 (delta_t =  21.629 [sec])
Background time interval of the image:
-239.432  -6.560 (delta_t = 232.872 [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

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   -6.560 sec. to  167.624 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.18923     ( -0.11758   0.11918 )
Norm@50keV  : 1.16479E-03    ( -7.26351e-05   7.25763e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.59 using 59 PHA bins.
# Reduced chi-squared =         0.8875 for     57 degrees of freedom 
# Null hypothesis probability =   7.127821e-01
 
Photon flux (15-150 keV)    in 174.2 sec: 0.136520 ( -0.008925  0.008963 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06509e-06 ( -1.41252e-07  1.41992e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.560 sec. to  167.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19069     ( -0.113133   0.142252 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.17057E-03    ( -7.26962e-05   0.000252649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.64 using 59 PHA bins.
# Reduced chi-squared =         0.9043 for     56 degrees of freedom 
# Null hypothesis probability =   6.771446e-01
 
Photon flux (15-150 keV)    in 174.2 sec: 0.137537 ( -0.009985  0.007905 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07605e-06 ( -1.53095e-07  1.30272e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.584 sec. to    9.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.086     ( -0.344173   0.36562 )
Norm@50keV  : 6.01794E-03    ( -0.00114706   0.00114223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.98 using 59 PHA bins.
# Reduced chi-squared =          1.210 for     57 degrees of freedom 
# Null hypothesis probability =   1.328472e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.697125 ( -0.136766  0.137229 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.32092e-08 ( -1.30836e-08  1.32043e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.584 sec. to    9.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.32411     ( -4.70735   2.13114 )
Epeak [keV] : 107.812      (   )
Norm@50keV  : 9.09094E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.58 using 59 PHA bins.
# Reduced chi-squared =          1.225 for     56 degrees of freedom 
# Null hypothesis probability =   1.206239e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.701857 ( -0.162086  0.153006 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.35214e-08 ( -1.52622e-08  1.47837e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 123.24 sec.
Hardness ratio (energy fluence ratio) = 1.75416325182

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

S(15-50 keV)  = 6.247542e-07
S(50-150 keV) = 1.4403419e-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 = -5.487857649298175E-01, IMY = 2.250439268988485E-01

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:
-239.432000 -6.560000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2234 -60.6652    7.2  52.7  161.5   1.1976   1.6    3.7	Cen X-3                       
179.1281 -52.7142    2.3  43.5  160.3   1.6560   5.0 ------	UNKNOWN                       

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

Time interval of the image:
-6.560000 15.068600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2939 -60.6283   21.7  52.7  161.5  -0.1094  -0.5    0.7	Cen X-3                       
197.6781  14.0442    3.0  25.3  -26.0   0.1721   3.8 ------	UNKNOWN                       
166.4659 -26.6663    0.5  30.7 -157.7   1.2076  23.7 ------	UNKNOWN                       
146.3944 -41.7236    1.8  51.9 -168.3   0.7186   6.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
65.868600 962.622100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5286 -40.5485    0.8  29.1 -170.4   6.6662  14.4    0.4	Vela X-1                      
170.3159 -60.6230    9.1  34.0  132.6   1.0083   1.3    0.0	Cen X-3                       
186.3116 -62.8224    2.5  38.4  121.5   5.2607   4.6   10.0	GX 301-2                      
213.1164  -4.0924    2.1  49.9   27.3   8.4262   5.4 ------	UNKNOWN                       
188.8784   2.5624    2.8  36.3   -4.2   2.5649   4.2 ------	UNKNOWN                       
187.9018  24.8440    3.3  55.5  -20.4   6.2941   3.5 ------	UNKNOWN                       
116.8102 -14.0232    2.7  48.0 -129.0   9.8604   4.2 ------	UNKNOWN