GRB100526A: 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: Fri Jan 17 18:23:13 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger423181
======================================================================

  Trigger: 00423181      Segment: 000

  BAT Trigger Time: 296583976   [s; MET]
      Trigger Stop: 296584040   [s; MET]
               UTC: 2010-05-26T16:26:10.166000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 230.785345490408   Dec: 25.6390614214754  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 230.785345490408   Dec: 25.6390614214754  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 230.784823014055   Dec: 25.6298554920833  [deg; J2000]  
        { 15h 23m 08.4s , +25d 37' 47.5" }
         +/- 1.8162569628365 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.0876105788903 [arcmin] (formal 1-sigma fit error)
    SNR: 12.967764214267
 
  Angular difference between the analysis and refined position is 0.553078 arcmin
 
  Partial Coding Fraction: 0.2695312    [ including projection effects ]

  Duration
     T90: 97.5999999642372 +/- 8.4753064967989
        Measured from: -20.8560000061989
                   to: 76.7439999580383     [s; relative to TRIGTIME]
     T50: 70.6839999556541 +/- 14.7373986772667
        Measured from: -9.92400002479553
                   to: 60.7599999308586     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 69.9039999842644     
                   to: 70.9039999842644     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -33.4800000190735     
                   to: 80.5     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.324158   1.448520   0.994924   0.213550
           0.112804   0.117239   0.102982   0.088454 [error]
 Peak      0.029222   0.037317   0.017107   0.015141
           0.010897   0.011264   0.010272   0.008189 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  113.980  -33.480   80.500
T90    97.600  -20.856   76.744
T50    70.684   -9.924   60.760
Peak    1.000   69.904   70.904
 
 
====== 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      -1.837    -0.167      0.162       -           -               -         2.36e-03     -2.30e-04          2.26e-04      67.990   57
CPL     -1.843    -0.984      0.430     9999.340    -9999.330      -9999.340      2.35e-03     -1.56e-03          1.51e-03      68.000   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      -1.707     -0.685     0.616       -           -               -         5.47e-03     -2.38e-03          2.31e-03      66.980   57
CPL      0.030     -2.207     5.813       52.790      N/A           N/A         4.88e-02        N/A               N/A         65.710   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   4.72e-07  7.06e-07  7.91e-07  1.68e-06  2.47e-06  3.64e-06   erg/cm2
      90%_error_low -6.43e-08 -6.05e-08 -1.06e-07 -4.26e-07 -2.41e-07 -5.30e-07   erg/cm2
      90%_error_hi   6.65e-08  6.05e-08  1.06e-07  5.12e-07  2.43e-07  5.94e-07   erg/cm2
Peak flux       PL   2.75e-01  2.45e-01  1.50e-01  1.39e-01  7.29e-01  8.09e-01   ph/cm2/s
      90%_error_low -1.47e-01 -9.91e-02 -7.75e-02 -1.39e-01 -2.91e-01 -3.21e-01   ph/cm2/s
      90%_error_hi   1.69e-01  9.84e-02  7.88e-02  1.80e-01  2.92e-01  3.24e-01   ph/cm2/s
 
Fluence        CPL   4.71e-07  6.61e-07  7.14e-07  1.73e-06  2.31e-06  3.54e-06   erg/cm2
      90%_error_low -8.02e-08 -1.36e-07 -1.43e-07 -8.21e-07 -4.67e-07 -4.70e-07   erg/cm2
      90%_error_hi   8.03e-08  4.72e-08  3.27e-08  2.16e-07  1.18e-07  3.90e-07   erg/cm2
Peak flux      CPL   2.21e-01  2.96e-01  1.60e-01  2.78e-02  7.01e-01  7.05e-01   ph/cm2/s
      90%_error_low -1.64e-01 -1.26e-01 -1.60e-01 -2.78e-02 -2.90e-01 -2.93e-01   ph/cm2/s
      90%_error_hi   1.89e-01  1.44e-01  1.02e-01  1.76e-01  2.95e-01  3.38e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  230.7848    25.6299   0.0148    40.9042    31.7463         3.2046489     12.968 TRIG_00423181                 
 
Foreground time interval of the image:
-33.480  72.101 (delta_t = 105.581 [sec])
Background time interval of the image:
-530.799 -508.939 (delta_t =  21.861 [sec])
-239.000 -33.480 (delta_t = 205.520 [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  -33.480 sec. to   80.500 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.83693     ( -0.167143   0.161889 )
Norm@50keV  : 2.35904E-03    ( -0.000229912   0.000225649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.99 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     57 degrees of freedom 
# Null hypothesis probability =   1.511706e-01
 
Photon flux (15-150 keV)    in 114 sec: 0.329860 ( -0.028835  0.028921 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.47369e-06 ( -2.40706e-07  2.43409e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -33.480 sec. to   80.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84265     ( -0.985398   0.428289 )
Epeak [keV] : 9999.34      ( -9999.35 -9999.36 )
Norm@50keV  : 2.35218E-03    ( -0.00156766   0.00150036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.00 using 59 PHA bins.
# Reduced chi-squared =          1.214 for     56 degrees of freedom 
# Null hypothesis probability =   1.305602e-01
 
Photon flux (15-150 keV)    in 114 sec: 0.296752 ( -0.055354  0.049549 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.31337e-06 ( -4.66802e-07  1.18415e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   69.904 sec. to   70.904 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.70745     ( -0.685827   0.615317 )
Norm@50keV  : 5.47449E-03    ( -0.00237915   0.00230706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.98 using 59 PHA bins.
# Reduced chi-squared =          1.175 for     57 degrees of freedom 
# Null hypothesis probability =   1.719174e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.728954 ( -0.291018  0.292166 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.06781e-08 ( -2.19061e-08  2.2841e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   69.904 sec. to   70.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.0299319     ( -2.20737   5.81197 )
Epeak [keV] : 52.7900      (   )
Norm@50keV  : 4.87510E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.71 using 59 PHA bins.
# Reduced chi-squared =          1.173 for     56 degrees of freedom 
# Null hypothesis probability =   1.757032e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.700501 ( -0.289545  0.294658 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.55816e-08 ( -2.11518e-08  2.43639e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 97.6 sec.
Hardness ratio (energy fluence ratio) = 1.11969578615

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

S(15-50 keV)  = 1.177596e-06
S(50-150 keV) = 1.2960862e-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 = 7.367381570224313E-01, IMY = -4.558411472072452E-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:
-530.799400 -508.938600
-239.000000 -33.480000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
184.3823 -24.6203    3.3  46.0  139.0   2.2952   3.5 ------	UNKNOWN                       
243.9430  49.8100    2.3  53.2   -0.3   2.4977   5.0 ------	UNKNOWN                       
172.5949  62.0443    2.8  41.8  -52.8   1.9001   4.2 ------	UNKNOWN                       

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

Time interval of the image:
-33.480000 72.100590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
210.2254  -1.5011    2.0  32.7   88.0   1.3936   5.8 ------	UNKNOWN                       
177.1322 -23.9154    2.5  46.1  148.3   1.6839   4.6 ------	UNKNOWN                       
222.4036  18.6487    2.2  34.0   44.7   1.0452   5.2 ------	UNKNOWN                       
230.7848  25.6299    0.9  40.9   31.7   3.2012  13.0 ------	UNKNOWN                       
165.6619  20.1341    2.3  19.3 -133.2   0.6254   5.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
132.500600 963.029400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4773  35.3190    8.9  22.5  -15.1   0.6221   1.3    1.7	Her X-1                       
268.3977  -1.3906    4.6  45.3   46.8   4.7472   2.5    4.1	SW J1753.5-0127               
219.6611  11.6989    2.8  17.5  145.0   1.9385   4.2 ------	UNKNOWN                       
266.3162  42.3775    3.0  33.5  -23.0   2.1963   3.9 ------	UNKNOWN                       
219.5471  66.1336    2.3  41.1  -80.9  12.2637   5.1 ------	UNKNOWN