GRB120701A: 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: Mon Jan 13 03:54:17 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger525477
======================================================================

  Trigger: 00525477      Segment: 000

  BAT Trigger Time: 362821850.944   [s; MET]
      Trigger Stop: 362821851.456   [s; MET]
               UTC: 2012-07-01T07:50:41.566840    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 80.3524070788699   Dec: -58.5615086474503  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.78
     Image Trigger?:     NO
     Rate S/N Ratio:     11.8743420870379  [ if not an image trigger ]
     Image S/N Ratio:    8.78

  Analysis Position:   [ source = BAT ]
    RA: 80.3524070788699   Dec: -58.5615086474503  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 80.3347479628263   Dec: -58.5318969948123  [deg; J2000]  
        { 05h 21m 20.3s , -58d 31' 54.8" }
         +/- 1.23024974295862 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.477526642567372 [arcmin] (formal 1-sigma fit error)
    SNR: 22.6233308696194
 
  Angular difference between the analysis and refined position is 1.860734 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 14.1599999666214 +/- 0.6541070433896
        Measured from: 0.467999994754791
                   to: 14.6279999613762     [s; relative to TRIGTIME]
     T50: 7.99599993228912 +/- 1.37199566468285
        Measured from: 3.96799999475479
                   to: 11.9639999270439     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 10.3600000143051     
                   to: 11.3600000143051     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0160000324249268     
                   to: 15.3560000061989     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.341187   0.626239   0.703032   0.216484
           0.031530   0.033596   0.032107   0.029757 [error]
 Peak      0.029825   0.057739   0.085361   0.027145
           0.008084   0.008900   0.009056   0.007868 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   15.372   -0.016   15.356
T90    14.160    0.468   14.628
T50     7.996    3.968   11.964
Peak    1.000   10.360   11.360
 
 
====== 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      -0.967    -0.097      0.099       -           -               -         8.60e-03     -4.65e-04          4.63e-04      59.210   57
CPL     -0.897    -0.244      0.327      930.171    -930.171      -930.171      9.22e-03     -1.03e-03          3.30e-03      59.260   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      -0.705     -0.233     0.249       -           -               -         1.35e-02     -1.96e-03          1.91e-03      59.370   57
CPL     -0.469     -0.445     0.971      415.611    -415.611      -415.611      1.68e-02     -4.57e-03          2.72e-02      59.190   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   1.03e-07  2.62e-07  5.36e-07  2.77e-06  1.45e-06  3.67e-06   erg/cm2
      90%_error_low -1.18e-08 -1.80e-08 -3.05e-08 -3.62e-07 -8.09e-08 -3.76e-07   erg/cm2
      90%_error_hi   1.23e-08  1.78e-08  3.04e-08  4.02e-07  8.11e-08  4.11e-07   erg/cm2
Peak flux       PL   2.62e-01  4.24e-01  5.21e-01  1.26e+00  1.56e+00  2.47e+00   ph/cm2/s
      90%_error_low -7.72e-02 -8.20e-02 -6.70e-02 -3.29e-01 -2.10e-01 -3.58e-01   ph/cm2/s
      90%_error_hi   8.79e-02  8.11e-02  6.68e-02  4.06e-01  2.12e-01  3.88e-01   ph/cm2/s
 
Fluence        CPL   3.52e-08  4.69e-08  4.83e-08  1.15e-07  1.61e-07  2.66e-07   erg/cm2
      90%_error_low -1.80e-08 -1.20e-08 -2.64e-08    N/A       N/A       N/A      erg/cm2
      90%_error_hi   8.56e-09  2.38e-08  1.95e-08    N/A       N/A       N/A      erg/cm2
Peak flux      CPL   2.41e-01  4.25e-01  5.37e-01  1.02e+00  1.55e+00  2.22e+00   ph/cm2/s
      90%_error_low -1.03e-01 -8.47e-02 -7.95e-02 -5.52e-01 -2.17e-01 -6.11e-01   ph/cm2/s
      90%_error_hi   1.04e-01  8.35e-02  9.32e-02  3.35e-01  2.18e-01  4.66e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   80.3347   -58.5319   0.0085    32.7365   162.1812         1.2691040     22.623 TRIG_00525477                 
 
Foreground time interval of the image:
 -0.016  10.757 (delta_t =  10.773 [sec])
Background time interval of the image:
-182.243  -0.016 (delta_t = 182.227 [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   -0.016 sec. to   15.356 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.967414     ( -0.0970661   0.0988848 )
Norm@50keV  : 8.59557E-03    ( -0.000464721   0.000462709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.21 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     57 degrees of freedom 
# Null hypothesis probability =   3.948076e-01
 
Photon flux (15-150 keV)    in 15.37 sec: 0.988131 ( -0.054354  0.054539 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.44562e-06 ( -8.08668e-08  8.11166e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.016 sec. to   15.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.961213     ( -0.240037   0.331159 )
Epeak [keV] : 9998.51      ( -9998.51 -9998.51 )
Norm@50keV  : 8.64849E-03    ( -0.000459874   0.00386522 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.21 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     56 degrees of freedom 
# Null hypothesis probability =   3.593678e-01
 
Photon flux (15-150 keV)    in 15.37 sec: 0.987805 ( -0.054744  0.054345 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.61233e-07 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   10.360 sec. to   11.360 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.704711     ( -0.233166   0.249203 )
Norm@50keV  : 1.35412E-02    ( -0.00195647   0.00190596 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.37 using 59 PHA bins.
# Reduced chi-squared =          1.042 for     57 degrees of freedom 
# Null hypothesis probability =   3.891701e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.56465 ( -0.21047  0.2116 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64957e-07 ( -2.20051e-08  2.20638e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   10.360 sec. to   11.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.468631     ( -0.444881   0.970943 )
Epeak [keV] : 415.611      ( -415.612 -415.612 )
Norm@50keV  : 1.67835E-02    ( -0.00456608   0.027186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.19 using 59 PHA bins.
# Reduced chi-squared =          1.057 for     56 degrees of freedom 
# Null hypothesis probability =   3.598718e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.55098 ( -0.21684  0.21802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.64059e-07 ( -2.26979e-08  2.24286e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 14.16 sec.
Hardness ratio (energy fluence ratio) = 2.04569028636

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

S(15-50 keV)  = 3.646508e-07
S(50-150 keV) = 1.0809724e-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 = -6.120485563868362E-01, IMY = -1.967291612168200E-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:
-182.243400 -0.016000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4685 -40.5334    1.7   5.9  -23.1   1.1935   6.8    3.0	Vela X-1                      
170.1113 -60.6051    2.0  28.0   72.6   1.6441   5.7    6.1	Cen X-3                       
186.6405 -62.9000    4.1  36.1   74.5   1.3672   2.8    7.8	GX 301-2                      
184.2869 -20.6593    2.5  50.4   14.2   2.3689   4.6 ------	UNKNOWN                       
128.9717 -43.1877    1.4   2.1  -91.8   1.4316   8.1 ------	UNKNOWN                       
108.5398  -8.1598    3.4  41.4  -99.0   3.2690   3.4 ------	UNKNOWN                       

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

Time interval of the image:
-0.016000 10.756590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.2617 -40.4934    0.0   5.9  -24.6  -0.0198  -0.5   12.7	Vela X-1                      
170.2986 -60.6201   51.8  28.1   72.5  -0.0155  -0.2    0.5	Cen X-3                       
186.5681 -62.7110   12.2  36.1   74.2   0.1044   0.9    4.3	GX 301-2                      
 80.3347 -58.5319    0.5  32.7  162.2   1.2691  22.6 ------	UNKNOWN                       
178.3507 -10.8029    2.2  53.4    0.2   0.6728   5.2 ------	UNKNOWN                       
154.6933 -12.4847    2.6  38.7  -25.1   0.2485   4.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
63.156600 962.143300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5238 -40.5596    1.0  38.6  -21.5   7.9844  11.4    0.4	Vela X-1                      
170.2994 -60.6170    4.7  41.9   24.2   2.5877   2.4    0.6	Cen X-3                       
186.6168 -62.7697 2700.0  46.2   33.9   0.0021   0.0    1.1	GX 301-2                      
203.4402 -68.1940    4.3  46.6   46.0   6.5978   2.7 ------	UNKNOWN                       
353.8721 -71.7460    3.7  34.9  104.5   4.1731   3.1 ------	UNKNOWN                       
  1.0725 -53.0828    2.9  42.2  132.8   7.3244   4.1 ------	UNKNOWN                       
128.9722 -43.1769    1.3  33.3  -24.3   5.4082   8.9 ------	UNKNOWN                       
 52.1975 -15.3860    2.6  48.0 -146.4   5.8411   4.4 ------	UNKNOWN                       
 75.0125 -15.0348    2.9  43.7 -116.1   8.8671   4.0 ------	UNKNOWN