GRB130913A

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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Oct  6 19:32:14 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================

  Trigger: 00570531      Segment: 000

  BAT Trigger Time: 400724908.8
               UTC: 2013-09-13T00:28:17.775   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA:    Dec:   [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 341.983598004   Dec: 1.16774168935  [deg; J2000]
        { 22h 47m 56.1s , +01d 10' 03.9" }
        +/- 4.77385009079 [arcmin] (estimated 90% radius based on SNR)
    SNR: 3.26108905588
 
 
  Angular difference between the analysis and refined position is 1083.177190 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 41.6000000238419 +/- 1.6
        Measured from: 1.6
                   to: 43.2     [s; relative to TRIGTIME]
     T50: 22.4000000357628 +/- 1.6
        Measured from: 11.2
                   to: 33.6     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   44.800    0.000   44.800
T90    41.600    1.600   43.200
T50    22.400   11.200   33.600
Peak    1.000    3.500    4.500
 
 
====== 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      -0.863    -0.504      0.558       -           -               -         1.11e-03     -3.17e-04          3.07e-04      64.310   57
CPL     -0.688     0.688      2.869      452.176      N/A           N/A         1.31e-03        N/A               N/A         64.290   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      -0.297     -1.906     0.297       -           -               -         1.07e-03     -1.07e-03          1.07e-03      60.860   57
CPL     -0.306      N/A       N/A        9999.360      N/A           N/A         1.09e-03        N/A               N/A         60.860   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   7.82e-09  2.13e-08  4.68e-08  2.71e-07  1.26e-07  3.47e-07   erg/cm2
      90%_error_low -4.18e-09 -7.72e-09 -1.42e-08 -1.51e-07 -3.74e-08 -1.61e-07   erg/cm2
      90%_error_hi   5.22e-09  7.36e-09  1.38e-08  2.66e-07  3.81e-08  2.66e-07   erg/cm2
Peak flux       PL   1.41e-02  2.94e-02  4.79e-02  1.75e-01  1.32e-01  2.67e-01   ph/cm2/s
      90%_error_low -1.41e-02 -2.94e-02 -4.79e-02 -1.75e-01 -1.32e-01 -2.67e-01   ph/cm2/s
      90%_error_hi   5.77e-02  4.54e-02  3.63e-02  1.09e+00  1.14e-01  7.72e-01   ph/cm2/s
 
Fluence        CPL   7.44e-09  2.15e-08  4.77e-08  2.16e-07  1.25e-07  2.93e-07   erg/cm2
      90%_error_low -4.11e-09 -7.85e-09 -1.49e-08    N/A    -4.03e-08 -1.97e-07   erg/cm2
      90%_error_hi   6.16e-09  8.13e-09  1.79e-08    N/A     3.89e-08  1.79e-07   erg/cm2
Peak flux      CPL   1.86e-02  3.14e-02  4.79e-02  1.72e-01  1.33e-01  2.78e-01   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A       N/A       N/A     ph/cm2/s
 
======================================================================

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
341.913 1.245 0.051 13.664 -134.912 0.067 3.780 TRIG_00570531
 
Image time interval: 1.200 to 4.501 [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.

Best duration plot

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    1.200 sec. to   11.221 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.862707     ( -0.503938   0.558231 )
Norm@50keV  : 1.10659E-03    ( -0.000316498   0.000307457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.31 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.358804e-01
 
Photon flux (15-150 keV)    in 10.02 sec: 0.127009 ( -0.0352652  0.035507 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26292e-07 ( -3.73643e-08  3.81026e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.200 sec. to   11.221 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.64909     ( 2.64911   4.83008 )
Epeak [keV] : 189.216      (   )
Norm@50keV  : 6.36961E-05    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.17 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     56 degrees of freedom 
# Null hypothesis probability =   2.119910e-01
 
Photon flux (15-150 keV)    in 10.02 sec: 0.125930 ( -0.0378316  0.036276 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25241e-07 ( -4.02979e-08  3.88776e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    3.500 sec. to    4.500 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.29718     ( -1.90679   0.296506 )
Norm@50keV  : 1.07190E-03    ( -0.0010715   0.00107013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.86 using 59 PHA bins.
# Reduced chi-squared =          1.068 for     57 degrees of freedom 
# Null hypothesis probability =   3.388716e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.132305 ( -0.132305  0.113569 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.60483e-08 ( -1.24072e-08  1.25316e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    3.500 sec. to    4.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.305803     (       )
Epeak [keV] : 9999.36      (   )
Norm@50keV  : 1.09185E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.86 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     56 degrees of freedom 
# Null hypothesis probability =   3.053295e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.132762 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.57203e-08 ( -1.57199e-08  1.30935e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -0.171635734287, IMY = 0.17216615615

Spacecraft aspect plot

Bright source in the event data image

Event data image of 15-350 keV band

Time interval of the image:
1.200000 4.500590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']

Webpage updated on:
Sun Jun 21 01:05:23 EDT 2015

Analysis Summary

Notes:

Image

15.0-350.0 keV image (Event data)

Light Curves

Best duration plot

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 event data image

Event data 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