GRB100814A: 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 16:42:07 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger431605
======================================================================

  Trigger: 00431605      Segment: 000

  BAT Trigger Time: 303450617.344   [s; MET]
      Trigger Stop: 303450618.368   [s; MET]
               UTC: 2010-08-14T03:50:11.265420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 22.4806329492837   Dec: -17.9856336940265  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    19.15
     Image Trigger?:     NO
     Rate S/N Ratio:     57.28874234961  [ if not an image trigger ]
     Image S/N Ratio:    19.15

  Analysis Position:   [ source = BAT ]
    RA: 22.4806329492837   Dec: -17.9856336940265  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 22.4791882419416   Dec: -17.9908202088949  [deg; J2000]  
        { 01h 29m 55.0s , -17d 59' 27.0" }
         +/- 0.542474021857736 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.155927410617329 [arcmin] (formal 1-sigma fit error)
    SNR: 72.8747418619124
 
  Angular difference between the analysis and refined position is 0.321927 arcmin
 
  Partial Coding Fraction: 0.90625    [ including projection effects ]

  Duration
     T90: 177.263999998569 +/- 10.8032091478143
        Measured from: -0.0320000052452087
                   to: 177.231999993324     [s; relative to TRIGTIME]
     T50: 95.0119999647141 +/- 5.52651100696616
        Measured from: 9.69200003147125
                   to: 104.703999996185     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.20800000429153     
                   to: 5.20800000429153     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -3.2039999961853     
                   to: 244.552000045776     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.818363   5.153462   4.177118   0.991628
           0.079652   0.082006   0.073994   0.065360 [error]
 Peak      0.034329   0.097832   0.152302   0.050976
           0.005927   0.006680   0.007109   0.005402 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  247.756   -3.204  244.552
T90   177.264   -0.032  177.232
T50    95.012    9.692  104.704
Peak    1.000    4.208    5.208
 
 
====== 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      -1.452    -0.042      0.042       -           -               -         3.73e-03     -7.90e-05          7.90e-05      32.630   57
CPL     -1.331    -0.140      0.170      312.961    -188.904      -312.961      4.22e-03     -5.29e-04          7.77e-04      31.070   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -0.605     -0.103     0.107       -           -               -         2.18e-02     -1.47e-03          1.46e-03      59.710   57
CPL      0.408     -0.502     0.576      155.903     -32.967        84.922      5.31e-02     -1.84e-02          3.19e-02      46.370   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   1.13e-06  2.14e-06  3.12e-06  9.76e-06  8.85e-06  1.61e-05   erg/cm2
      90%_error_low -5.09e-08 -5.51e-08 -7.98e-08 -5.81e-07 -1.96e-07 -6.16e-07   erg/cm2
      90%_error_hi   5.19e-08  5.49e-08  7.96e-08  6.07e-07  1.96e-07  6.37e-07   erg/cm2
Peak flux       PL   3.83e-01  6.60e-01  8.69e-01  2.32e+00  2.54e+00  4.23e+00   ph/cm2/s
      90%_error_low -5.31e-02 -5.87e-02 -5.20e-02 -2.83e-01 -1.58e-01 -3.00e-01   ph/cm2/s
      90%_error_hi   5.63e-02  5.86e-02  5.19e-02  3.08e-01  1.59e-01  3.11e-01   ph/cm2/s
 
Fluence        CPL   1.09e-06  2.15e-06  3.16e-06  8.32e-06  8.78e-06  1.47e-05   erg/cm2
      90%_error_low -6.88e-08 -5.72e-08 -9.01e-08 -1.59e-06 -2.20e-07 -1.60e-06   erg/cm2
      90%_error_hi   3.52e-08  5.75e-08  9.07e-08  1.59e-06  2.20e-07  1.63e-06   erg/cm2
Peak flux      CPL   2.67e-01  6.56e-01  9.85e-01  1.14e+00  2.47e+00  3.05e+00   ph/cm2/s
      90%_error_low -6.67e-02 -6.72e-02 -7.52e-02 -2.93e-01 -1.61e-01 -3.37e-01   ph/cm2/s
      90%_error_hi   7.31e-02  6.60e-02  7.64e-02  4.33e-01  1.62e-01  4.52e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   22.4792   -17.9908   0.0026    26.2918   -12.4186         4.7959070     72.875 TRIG_00431605                 
 
Foreground time interval of the image:
 -3.204  15.757 (delta_t =  18.961 [sec])
Background time interval of the image:
-575.943 -543.305 (delta_t =  32.638 [sec])
-239.344  -3.204 (delta_t = 236.140 [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   -3.204 sec. to  244.552 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.45168     ( -0.0418236   0.0418457 )
Norm@50keV  : 3.73282E-03    ( -7.90179e-05   7.90097e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          32.63 using 59 PHA bins.
# Reduced chi-squared =         0.5724 for     57 degrees of freedom 
# Null hypothesis probability =   9.960942e-01
 
Photon flux (15-150 keV)    in 247.8 sec: 0.460221 ( -0.01106  0.011099 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.84995e-06 ( -1.95866e-07  1.95936e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -3.204 sec. to  244.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33082     ( -0.139869   0.170383 )
Epeak [keV] : 312.961      ( -188.906 -312.963 )
Norm@50keV  : 4.22174E-03    ( -0.000529202   0.000776823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          31.07 using 59 PHA bins.
# Reduced chi-squared =         0.5549 for     56 degrees of freedom 
# Null hypothesis probability =   9.972212e-01
 
Photon flux (15-150 keV)    in 247.8 sec: 0.455483 ( -0.012661  0.012726 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.77529e-06 ( -2.20463e-07  2.19711e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    4.208 sec. to    5.208 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.604906     ( -0.103324   0.10652 )
Norm@50keV  : 2.17867E-02    ( -0.001473   0.001458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.71 using 59 PHA bins.
# Reduced chi-squared =          1.048 for     57 degrees of freedom 
# Null hypothesis probability =   3.773050e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.54218 ( -0.15843  0.15874 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.77978e-07 ( -1.72966e-08  1.73401e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    4.208 sec. to    5.208 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.407887     ( -0.502456   0.57565 )
Epeak [keV] : 155.903      ( -32.9671 84.9223 )
Norm@50keV  : 5.30566E-02    ( -0.0184319   0.0318866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.37 using 59 PHA bins.
# Reduced chi-squared =         0.8280 for     56 degrees of freedom 
# Null hypothesis probability =   8.170399e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.47432 ( -0.16112  0.16171 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.74025e-07 ( -1.81075e-08  1.80202e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 177.264 sec.
Hardness ratio (energy fluence ratio) = 1.46237945192

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

S(15-50 keV)  = 3.265329e-06
S(50-150 keV) = 5.584567e-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 = 4.824926271121956E-01, IMY = 1.062471090288457E-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:
-575.943400 -543.304900
-239.344000 -3.204000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1006  38.2451    3.7  51.2  178.5   1.7456   3.1    5.7	Cyg X-2                       
335.4854 -32.3998    2.8  40.6   71.0   3.0734   4.1 ------	UNKNOWN                       
 30.2188 -44.1664    2.3  50.1    9.2   2.5211   4.9 ------	UNKNOWN                       
336.6924  25.0994    2.8  35.8  173.0   1.1102   4.1 ------	UNKNOWN                       
 49.4519  -1.6232    5.5  47.1  -53.2   2.0941   2.1 ------	UNKNOWN                       
 19.1105  44.9894    2.5  48.0 -129.0   4.3355   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-3.204000 15.756590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.3025  38.3547   13.2  51.2  178.8   0.1525   0.9    6.5	Cyg X-2                       
  6.6664 -51.4064    2.1  50.9   31.7   1.6887   5.5 ------	UNKNOWN                       
 22.4792 -17.9908    0.2  26.3  -12.4   4.7960  72.9 ------	UNKNOWN                       
328.5628  44.3230    1.7  54.1 -174.3   1.3020   6.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
75.156590 719.156620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
349.9294   4.2644    3.0  39.0  127.5   3.4847   3.8 ------	UNKNOWN                       
 22.4940 -17.9987    0.7   0.0  -96.3   5.4797  15.7 ------	UNKNOWN                       
 62.9622 -49.2504    2.5  45.1  -31.0   2.9833   4.5 ------	UNKNOWN