GRB140430A: 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 23:14:34 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger597722
======================================================================

  Trigger: 00597722      Segment: 000

  BAT Trigger Time: 420582828.48   [s; MET]
      Trigger Stop: 420582828.992   [s; MET]
               UTC: 2014-04-30T20:33:36.527160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 102.929387590687   Dec: 23.0094966592596  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.01
     Image Trigger?:     NO
     Rate S/N Ratio:     15.7162336455017  [ if not an image trigger ]
     Image S/N Ratio:    9.01

  Analysis Position:   [ source = BAT ]
    RA: 102.929387590687   Dec: 23.0094966592596  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 102.937944482399   Dec: 23.0365183284277  [deg; J2000]  
        { 06h 51m 45.1s , +23d 02' 11.5" }
         +/- 1.03827433826553 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.403022539645457 [arcmin] (formal 1-sigma fit error)
    SNR: 28.8280556055997
 
  Angular difference between the analysis and refined position is 1.688754 arcmin
 
  Partial Coding Fraction: 1.03125    [ including projection effects ]

  Duration
     T90: 173.587999939919 +/- 3.7074196198355
        Measured from: 0.435999989509583
                   to: 174.023999929428     [s; relative to TRIGTIME]
     T50: 151.607999920845 +/- 8.96403928269971
        Measured from: 2.37199997901917
                   to: 153.979999899864     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.43999999761581     
                   to: 3.43999999761581     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.304000020027161     
                   to: 177.575999975204     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.857825   0.876561   0.443856   0.167611
           0.076080   0.080175   0.075188   0.079717 [error]
 Peak      0.077636   0.139918   0.080152   0.026840
           0.006830   0.007719   0.007102   0.006444 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  177.880   -0.304  177.576
T90   173.588    0.436  174.024
T50   151.608    2.372  153.980
Peak    1.000    2.440    3.440
 
 
====== 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      -2.006    -0.230      0.217       -           -               -         6.91e-04     -1.03e-04          1.00e-04      54.940   57
CPL     -2.108    -0.466      0.374       47.620      N/A           N/A         5.85e-04        N/A               N/A         54.310   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      -1.395     -0.120     0.119       -           -               -         2.05e-02     -1.49e-03          1.48e-03      65.120   57
CPL     -0.790     -0.514     0.605       92.322     -26.290       226.230      4.36e-02     -2.02e-02          4.86e-02      61.010   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   2.53e-07  3.42e-07  3.41e-07  6.12e-07  1.13e-06  1.55e-06   erg/cm2
      90%_error_low -3.68e-08 -3.66e-08 -6.97e-08 -2.18e-07 -1.54e-07 -3.02e-07   erg/cm2
      90%_error_hi   3.75e-08  3.63e-08  7.26e-08  2.92e-07  1.60e-07  3.63e-07   erg/cm2
Peak flux       PL   7.64e-01  8.19e-01  6.23e-01  7.72e-01  2.50e+00  2.98e+00   ph/cm2/s
      90%_error_low -8.79e-02 -6.00e-02 -5.72e-02 -1.35e-01 -1.74e-01 -2.20e-01   ph/cm2/s
      90%_error_hi   9.04e-02  5.98e-02  5.70e-02  1.52e-01  1.74e-01  2.23e-01   ph/cm2/s
 
Fluence        CPL   2.43e-07  3.29e-07  3.52e-07  6.92e-07  1.11e-06  1.65e-06   erg/cm2
      90%_error_low -4.43e-08 -1.67e-07 -2.58e-07 -2.69e-07 -1.79e-07 -1.06e-06   erg/cm2
      90%_error_hi   4.21e-08  4.48e-08  1.84e-08  1.57e-07  1.78e-07  1.29e-07   erg/cm2
Peak flux      CPL   7.06e-01  8.76e-01  6.38e-01  3.58e-01  2.43e+00  2.58e+00   ph/cm2/s
      90%_error_low -1.01e-01 -7.77e-02 -6.29e-02 -1.69e-01 -1.84e-01 -2.52e-01   ph/cm2/s
      90%_error_hi   1.03e-01  8.09e-02  6.30e-02  3.22e-01  1.83e-01  3.47e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  102.9379    23.0365   0.0066     9.1187    19.6796         1.2950529     28.828 TRIG_00597722                 
 
Foreground time interval of the image:
 -0.304  10.021 (delta_t =  10.325 [sec])
Background time interval of the image:
-179.480  -0.304 (delta_t = 179.176 [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   -0.304 sec. to  177.576 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.00561     ( -0.230441   0.217254 )
Norm@50keV  : 6.90716E-04    ( -0.000103272   0.000100327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.94 using 59 PHA bins.
# Reduced chi-squared =         0.9638 for     57 degrees of freedom 
# Null hypothesis probability =   5.528264e-01
 
Photon flux (15-150 keV)    in 177.9 sec: 0.103883 ( -0.0106763  0.010678 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13372e-06 ( -1.54015e-07  1.60314e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.304 sec. to  177.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.38858     ( -0.184899   0.65539 )
Epeak [keV] : 143.214      (   )
Norm@50keV  : 4.35877E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.66 using 59 PHA bins.
# Reduced chi-squared =         0.9582 for     56 degrees of freedom 
# Null hypothesis probability =   5.640469e-01
 
Photon flux (15-150 keV)    in 177.9 sec: 8.60012E-02 ( -0.020872  0.0268488 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10567e-06 ( -1.79234e-07  1.77651e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.440 sec. to    3.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3949     ( -0.119909   0.11938 )
Norm@50keV  : 2.05371E-02    ( -0.00149145   0.00148451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.12 using 59 PHA bins.
# Reduced chi-squared =          1.142 for     57 degrees of freedom 
# Null hypothesis probability =   2.150654e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.49821 ( -0.17434  0.17437 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.98674e-07 ( -1.6339e-08  1.65397e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.440 sec. to    3.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.790201     ( -0.513853   0.604897 )
Epeak [keV] : 92.3218      ( -26.2996 226.221 )
Norm@50keV  : 4.35631E-02    ( -0.0202312   0.0485947 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.01 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.007670e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.43403 ( -0.1838  0.18307 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85413e-07 ( -2.00608e-08  2.00199e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 173.588 sec.
Hardness ratio (energy fluence ratio) = 0.996139359836

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

S(15-50 keV)  = 5.946281e-07
S(50-150 keV) = 5.390813e-07

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 = 1.511338956559928E-01, IMY = -5.405304042056846E-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:
-179.480000 -0.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6298  22.0065    0.5  15.6  -69.3   6.1255  23.5    0.5	Crab                          
146.9509  43.4228    3.2  50.1   37.2   4.1878   3.6 ------	UNKNOWN                       
143.4363  45.6388    3.1  48.6   33.2   3.6576   3.7 ------	UNKNOWN                       
123.8181  28.4858    2.6  27.1   47.9   1.2808   4.4 ------	UNKNOWN                       
103.2026  43.8474    3.0  29.1   -0.9   1.0431   3.8 ------	UNKNOWN                       
 87.4598  -3.4380    2.2  21.4 -157.0   1.1408   5.2 ------	UNKNOWN                       
 84.6893  31.5669    2.5  20.7  -42.8   1.1954   4.7 ------	UNKNOWN                       
 55.0304  30.4941    3.1  42.5  -69.1   4.0850   3.8 ------	UNKNOWN                       

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

Time interval of the image:
-0.304000 10.020600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7102  22.0497    4.8  15.5  -69.1   0.1030   2.4    4.8	Crab                          
102.9379  23.0365    0.4   9.1   19.7   1.2952  28.8 ------	UNKNOWN                       
 56.1100  14.2489    2.3  40.8  -93.6   0.9758   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
39.820610 497.320600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6331  22.0156    0.2  17.8  -94.3  19.2958  48.6    0.1	Crab                          
136.0031   8.4562    3.0  34.9  104.4   3.6354   3.8 ------	UNKNOWN                       
123.8870  64.8678    2.6  44.0    7.7   2.9215   4.5 ------	UNKNOWN                       
 98.1385 -25.9798    3.1  49.2 -179.2   3.4108   3.7 ------	UNKNOWN                       
 68.7343 -21.0558    4.5  55.2 -145.2   7.4792   2.6 ------	UNKNOWN