GRB140323A: 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: Sat Oct  4 23:58:33 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger592916
======================================================================

  Trigger: 00592916      Segment: 000

  BAT Trigger Time: 417263003.712   [s; MET]
      Trigger Stop: 417263004.736   [s; MET]
               UTC: 2014-03-23T10:23:11.917100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 356.888109888947   Dec: -79.9167691220257  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.58
     Image Trigger?:     NO
     Rate S/N Ratio:     35.2562051276084  [ if not an image trigger ]
     Image S/N Ratio:    7.58

  Analysis Position:   [ source = BAT ]
    RA: 356.888109888947   Dec: -79.9167691220257  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 356.963632730695   Dec: -79.9134225829457  [deg; J2000]  
        { 23h 47m 51.3s , -79d 54' 48.3" }
         +/- 1.04494396348208 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.419855367388977 [arcmin] (formal 1-sigma fit error)
    SNR: 28.5655548189585
 
  Angular difference between the analysis and refined position is 0.818488 arcmin
 
  Partial Coding Fraction: 0.1269531    [ including projection effects ]

  Duration
     T90: 106.487999975681 +/- 3.25602762888333
        Measured from: -4.15200001001358
                   to: 102.335999965668     [s; relative to TRIGTIME]
     T50: 72.9719999432564 +/- 1.88163330752207
        Measured from: 10.3759999871254
                   to: 83.3479999303818     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.4200000166893     
                   to: 7.4200000166893     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -19.2080000042915     
                   to: 117.367999970913     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     6.080653   8.709724   7.162746   1.956064
           0.135692   0.148706   0.137405   0.113570 [error]
 Peak      0.102445   0.248086   0.316572   0.094993
           0.019567   0.024894   0.025173   0.020377 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  136.576  -19.208  117.368
T90   106.488   -4.152  102.336
T50    72.972   10.376   83.348
Peak    1.000    6.420    7.420
 
 
====== 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      -1.503    -0.042      0.042       -           -               -         1.22e-02     -2.72e-04          2.72e-04      52.000   57
CPL     -1.324    -0.164      0.173      215.353     -78.129      1510.317      1.47e-02     -2.17e-03          2.75e-03      48.680   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      -1.030     -0.156     0.160       -           -               -         5.58e-02     -5.50e-03          5.47e-03      55.490   57
CPL     -0.288     -0.691     0.827      137.367     -43.426       754.396      1.17e-01     -5.75e-02          1.40e-01      52.130   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   2.12e-06  3.89e-06  5.50e-06  1.63e-05  1.57e-05  2.78e-05   erg/cm2
      90%_error_low -9.74e-08 -1.04e-07 -1.46e-07 -9.83e-07 -3.61e-07 -1.05e-06   erg/cm2
      90%_error_hi   9.93e-08  1.04e-07  1.45e-07  1.03e-06  3.62e-07  1.09e-06   erg/cm2
Peak flux       PL   3.21e-04  3.94e-03  4.39e-02  4.24e+00  1.97e-01  4.23e+00   ph/cm2/s
      90%_error_low -6.07e-06 -3.40e-05 2.42e-04 -3.98e-01 2.77e-03 -3.53e-01   ph/cm2/s
      90%_error_hi   2.28e-04  2.52e-03  2.53e-02  1.21e+00  1.08e-01  1.32e+00   ph/cm2/s
 
Fluence        CPL   2.02e-06  3.93e-06  5.59e-06  1.30e-05  1.56e-05  2.46e-05   erg/cm2
      90%_error_low -1.30e-07 -1.09e-07 -1.69e-07 -2.40e-06 -3.93e-07 -2.42e-06   erg/cm2
      90%_error_hi   1.32e-07  1.10e-07  1.70e-07  1.78e-06  3.92e-07  3.05e-06   erg/cm2
Peak flux      CPL   1.20e+00  2.03e+00  2.11e+00  1.85e+00  6.31e+00  7.19e+00   ph/cm2/s
      90%_error_low -3.51e-01 -2.67e-01 -2.66e-01 -7.47e-01 -6.62e-01 -1.03e+00   ph/cm2/s
      90%_error_hi   3.79e-01  2.69e-01  2.71e-01  1.40e+00  6.65e-01  1.48e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  356.9636   -79.9134   0.0067    49.0687   159.1106         8.2755307     28.566 TRIG_00592916                 
 
Foreground time interval of the image:
-19.208  16.189 (delta_t =  35.397 [sec])
Background time interval of the image:
-385.011 -352.082 (delta_t =  32.929 [sec])
-239.712 -19.208 (delta_t = 220.504 [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

Multiple GTIs in the spectrum
tstart tstop
-19.208000 21.400100
22.288000 117.368000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50261     ( -0.0422653   0.042262 )
Norm@50keV  : 1.22210E-02    ( -0.000271842   0.000271828 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.00 using 59 PHA bins.
# Reduced chi-squared =         0.9123 for     57 degrees of freedom 
# Null hypothesis probability =   6.626207e-01
 
Photon flux (15-150 keV)    in 135.7 sec: 1.52677 ( -0.03881  0.03895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57275e-05 ( -3.60821e-07  3.61535e-07 ) ergs/cm2
 

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-19.208000 21.400100
22.288000 117.368000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3241     ( -0.163955   0.173199 )
Epeak [keV] : 215.353      ( -78.1291 1510.32 )
Norm@50keV  : 1.46613E-02    ( -0.00216559   0.00275233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.68 using 59 PHA bins.
# Reduced chi-squared =         0.8692 for     56 degrees of freedom 
# Null hypothesis probability =   7.456440e-01
 
Photon flux (15-150 keV)    in 135.7 sec: 1.50504 ( -0.04327  0.04351 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.55636e-05 ( -3.9342e-07  3.9191e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    6.420 sec. to    7.420 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.03015     ( -0.155657   0.159704 )
Norm@50keV  : 5.58294E-02    ( -0.0054997   0.00547322 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.49 using 59 PHA bins.
# Reduced chi-squared =         0.9735 for     57 degrees of freedom 
# Null hypothesis probability =   5.319338e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.197247 0.218492 0.158693 0.115822 8.75817E-02 6.95516E-02 5.81314E-02 5.08007E-02 4.59625E-02 4.26571E-02 4.03172E-02 3.86042E-02 3.73122E-02 3.63118E-02 3.55193E-02 3.48789E-02 3.39191E-02 3.32324E-02 3.23260E-02 3.16925E-02 2.94414E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.97448e-07 ( -5.99832e-08  6.00887e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    6.420 sec. to    7.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.288481     ( -0.690829   0.826875 )
Epeak [keV] : 137.367      ( -43.426 754.396 )
Norm@50keV  : 0.117050    ( -0.0575115   0.139533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.13 using 59 PHA bins.
# Reduced chi-squared =         0.9309 for     56 degrees of freedom 
# Null hypothesis probability =   6.221417e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.30583 ( -0.66229  0.66489 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.88274e-07 ( -6.26805e-08  6.20503e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 106.488 sec.
Hardness ratio (energy fluence ratio) = 1.41169212961

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

S(15-50 keV)  = 6.017287e-06
S(50-150 keV) = 9.710407e-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 = -1.077361481201155E+00, IMY = -4.111765323249528E-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:
-385.011410 -352.082000
-239.712000 -19.208000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 69.4509 -68.4331    2.8  39.1  132.6   1.8699   4.1 ------	UNKNOWN                       
 74.2462 -46.9914    2.2  30.4   97.4   1.7221   5.2 ------	UNKNOWN                       
 73.3815   9.6435    1.9  54.8   14.8   6.3846   6.1 ------	UNKNOWN                       
313.5589 -61.3271    4.4  58.3 -175.5   3.3159   2.6 ------	UNKNOWN                       
317.1692 -57.3009    3.5  57.4 -170.4   3.0585   3.3 ------	UNKNOWN                       
 46.8650   8.2331    2.4  42.7  -16.5   1.3091   4.8 ------	UNKNOWN                       
 44.2620  15.1972    2.4  49.2  -21.5   2.0734   4.9 ------	UNKNOWN                       
 42.8477  25.1050    3.6  58.9  -24.4   4.3178   3.2 ------	UNKNOWN                       

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

Time interval of the image:
-19.208000 16.188600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
356.9636 -79.9134    0.4  49.1  159.1   8.2755  28.5 ------	UNKNOWN                       
 55.8340 -48.1599    2.3  19.8  113.0   0.4318   5.1 ------	UNKNOWN                       
 22.1404 -30.3756    1.9  13.7 -110.3   0.4189   5.9 ------	UNKNOWN                       
 57.2765  22.0116    1.9  58.6   -8.5   2.1693   6.0 ------	UNKNOWN                       
 15.8891 -25.3981    2.5  20.8 -102.2   0.3708   4.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
86.188600 823.088600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.2401 -60.7677    5.4  39.2   79.4   3.7114   2.1    9.0	Cen X-3                       
186.6630 -62.6620    4.4  37.3   91.9   3.4062   2.6    6.5	GX 301-2                      
264.6210 -44.4360    5.7  46.8  162.7   2.2012   2.0    5.3	4U 1735-44                    
356.8801 -79.9100    0.8   0.0 -121.3   5.7304  14.6 ------	UNKNOWN                       
282.7545 -29.4182    4.7  58.3 -175.4   6.7270   2.5 ------	UNKNOWN                       
 55.9264 -59.1264    2.3  27.0  -19.5   1.9145   5.1 ------	UNKNOWN                       
  9.2582 -39.1706    2.5  41.0  -80.8   8.7317   4.6 ------	UNKNOWN                       
  3.6098 -39.1710    4.9  40.8  -87.5   5.2228   2.4 ------	UNKNOWN