GRB110709A: 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 22:00:48 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger456939
======================================================================

  Trigger: 00456939      Segment: 000

  BAT Trigger Time: 331917876.288   [s; MET]
      Trigger Stop: 331917877.312   [s; MET]
               UTC: 2011-07-09T15:24:29.148680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 238.89550647638   Dec: 40.8976448151732  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    18.12
     Image Trigger?:     NO
     Rate S/N Ratio:     108.52649446103  [ if not an image trigger ]
     Image S/N Ratio:    18.12

  Analysis Position:   [ source = BAT ]
    RA: 238.89550647638   Dec: 40.8976448151732  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 238.894804457077   Dec: 40.9184617549466  [deg; J2000]  
        { 15h 55m 34.8s , +40d 55' 06.5" }
         +/- 0.518533347412532 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.138303340410033 [arcmin] (formal 1-sigma fit error)
    SNR: 77.7284932717575
 
  Angular difference between the analysis and refined position is 1.249422 arcmin
 
  Partial Coding Fraction: 0.9140625    [ including projection effects ]

  Duration
     T90: 44.3279999494553 +/- 0.542070084896921
        Measured from: -0.564000010490417
                   to: 43.7639999389648     [s; relative to TRIGTIME]
     T50: 27.4439999461174 +/- 0.229120056090684
        Measured from: 6.82400000095367
                   to: 34.2679999470711     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 34.2480000257492     
                   to: 35.2480000257492     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.2960000038147     
                   to: 56.4760000109673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.379927   5.342922   4.724045   1.407962
           0.051547   0.056836   0.053606   0.042741 [error]
 Peak      0.184746   0.303154   0.222671   0.051087
           0.008238   0.009785   0.008983   0.006040 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   60.772   -4.296   56.476
T90    44.328   -0.564   43.764
T50    27.444    6.824   34.268
Peak    1.000   34.248   35.248
 
 
====== 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      -1.232    -0.031      0.031       -           -               -         1.63e-02     -2.71e-04          2.70e-04      41.680   57
CPL     -1.180    -0.063      0.086      966.079    -966.079      -966.079      1.71e-02     -1.02e-03          1.21e-03      42.100   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      -1.374     -0.069     0.069       -           -               -         4.92e-02     -1.94e-03          1.94e-03      61.260   57
CPL     -0.985     -0.272     0.291      136.545     -37.542       179.793      7.60e-02     -1.95e-02          2.85e-02      55.140   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   9.85e-07  2.13e-06  3.63e-06  1.42e-05  9.97e-06  2.10e-05   erg/cm2
      90%_error_low -3.68e-08 -4.63e-08 -6.30e-08 -5.99e-07 -1.62e-07 -6.14e-07   erg/cm2
      90%_error_hi   3.74e-08  4.62e-08  6.29e-08  6.18e-07  1.62e-07  6.30e-07   erg/cm2
Peak flux       PL   1.79e+00  1.95e+00  1.50e+00  1.90e+00  5.96e+00  7.14e+00   ph/cm2/s
      90%_error_low -1.27e-01 -8.50e-02 -7.25e-02 -1.85e-01 -2.39e-01 -2.88e-01   ph/cm2/s
      90%_error_hi   1.30e-01  8.47e-02  7.22e-02  1.97e-01  2.39e-01  2.89e-01   ph/cm2/s
 
Fluence        CPL   9.84e-07  2.13e-06  3.64e-06  1.42e-05  9.97e-06  2.02e-05   erg/cm2
      90%_error_low -3.67e-08 -4.31e-08 -6.23e-08 -1.92e-06 -1.58e-07 -1.18e-06   erg/cm2
      90%_error_hi   2.64e-08  3.36e-08  6.22e-08  3.72e-07  1.61e-07  8.22e-07   erg/cm2
Peak flux      CPL   1.66e+00  2.01e+00  1.56e+00  1.25e+00  5.85e+00  6.47e+00   ph/cm2/s
      90%_error_low -1.56e-01 -9.62e-02 -8.30e-02 -3.07e-01 -2.50e-01 -4.06e-01   ph/cm2/s
      90%_error_hi   1.59e-01  9.73e-02  8.40e-02  4.24e-01  2.50e-01  4.85e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  238.8948    40.9185   0.0025    18.4520   152.8293         6.4504576     77.728 TRIG_00456939                 
 
Foreground time interval of the image:
 -4.296  14.813 (delta_t =  19.109 [sec])
Background time interval of the image:
-239.288  -4.296 (delta_t = 234.992 [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   -4.296 sec. to   56.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23213     ( -0.0313679   0.0314518 )
Norm@50keV  : 1.63131E-02    ( -0.000270926   0.000270348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.68 using 59 PHA bins.
# Reduced chi-squared =         0.7312 for     57 degrees of freedom 
# Null hypothesis probability =   9.363271e-01
 
Photon flux (15-150 keV)    in 60.77 sec: 1.92396 ( -0.03573  0.03588 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.96987e-06 ( -1.62119e-07  1.62229e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.296 sec. to   56.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17987     ( -0.0153941   0.133283 )
Epeak [keV] : 966.079      ( -9680.9 -9680.9 )
Norm@50keV  : 1.71354E-02    ( -0.000270049   0.00195393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.10 using 59 PHA bins.
# Reduced chi-squared =         0.7519 for     56 degrees of freedom 
# Null hypothesis probability =   9.156233e-01
 
Photon flux (15-150 keV)    in 60.77 sec: 1.92315 ( -0.0403  0.03558 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.96756e-06 ( -1.58003e-07  1.61273e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   34.248 sec. to   35.248 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.37432     ( -0.068865   0.0686606 )
Norm@50keV  : 4.91931E-02    ( -0.00194014   0.00193873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.26 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     57 degrees of freedom 
# Null hypothesis probability =   3.258511e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.95692 ( -0.23913  0.23933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.77958e-07 ( -2.09645e-08  2.10414e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   34.248 sec. to   35.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.985497     ( -0.272135   0.290851 )
Epeak [keV] : 136.545      ( -37.5421 179.793 )
Norm@50keV  : 7.60110E-02    ( -0.0195129   0.0284675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.14 using 59 PHA bins.
# Reduced chi-squared =         0.9846 for     56 degrees of freedom 
# Null hypothesis probability =   5.074148e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.84869 ( -0.25022  0.25025 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.655e-07 ( -2.30543e-08  2.29274e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 44.328 sec.
Hardness ratio (energy fluence ratio) = 1.70278523171

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

S(15-50 keV)  = 3.1196588e-06
S(50-150 keV) = 6.850218e-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 = -2.968442908855459E-01, IMY = -1.523657199714717E-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:
-239.288000 -4.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4008  35.1497    0.0  22.6  115.4   0.2410   0.9   11.9	Her X-1                       
299.5969  35.2031    0.8  39.0   46.0   6.6043  13.9    0.3	Cyg X-1                       
308.0989  40.9346    1.8  39.3   32.0   2.7656   6.4    1.2	Cyg X-3                       
326.2124  38.2033    7.4  50.9   20.4  -1.3216  -1.5    7.4	Cyg X-2                       
308.0802  37.6296    2.7  41.6   35.6   2.1345   4.3 ------	UNKNOWN                       
326.7368  38.5848    2.4  50.9   19.7   3.7634   4.9 ------	UNKNOWN                       
329.0776  47.4862    2.6  45.7    9.7   1.8390   4.4 ------	UNKNOWN                       
211.3116  18.5831    2.6  48.8  176.2   2.1538   4.4 ------	UNKNOWN                       

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

Time interval of the image:
-4.296000 14.812600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4854  35.3837    5.5  22.3  115.2  -0.2211  -2.1    2.8	Her X-1                       
299.7436  35.1473    3.9  39.1   45.9   0.6445   3.0    8.2	Cyg X-1                       
307.9546  41.0458    5.7  39.1   32.0   0.3465   2.0    9.0	Cyg X-3                       
326.0400  38.4117   11.9  50.6   20.3   0.3444   1.0    8.2	Cyg X-2                       
238.8948  40.9185    0.1  18.5  152.8   6.4504  77.7 ------	UNKNOWN                       
206.2733  16.0201    2.4  53.3 -179.9   1.2543   4.8 ------	UNKNOWN                       
223.6866  77.2703    2.4  21.8  -73.6   0.4871   4.8 ------	UNKNOWN                       
183.9462  23.7524    2.3  58.0 -153.4   2.6099   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
54.812590 962.782600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3885  35.2787    9.1  13.4   66.1  -0.6119  -1.3    5.1	Her X-1                       
299.5975  35.1909    1.0  47.2   32.5  20.1313  11.3    0.7	Cyg X-1                       
308.1098  40.9141    3.7  50.8   21.9   6.9092   3.1    2.3	Cyg X-3                       
246.2499   3.6712    2.7  37.8  124.2   6.1216   4.5 ------	UNKNOWN                       
246.4043   4.0113    3.6  37.5  123.9   4.9918   3.8 ------	UNKNOWN                       
225.6690  12.2812    2.6  30.9  162.0   3.0940   4.5 ------	UNKNOWN                       
308.7316  54.6298    3.1  46.8    4.5   3.4591   3.7 ------	UNKNOWN                       
285.6322  60.6654    2.9  34.4   -4.7   2.5246   4.0 ------	UNKNOWN                       
196.5306  -1.5636    4.4  57.3 -170.6   6.3134   2.6 ------	UNKNOWN                       
339.0686  65.0186    2.5  57.5  -14.2  12.2795   4.6 ------	UNKNOWN                       
182.5968  14.4678    3.8  55.3 -145.2  12.6468   3.0 ------	UNKNOWN