GRB070529: 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 20 09:22:43 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger280706
======================================================================

  Trigger: 00280706      Segment: 000

  BAT Trigger Time: 202135710.336   [s; MET]
      Trigger Stop: 202135722.496   [s; MET]
               UTC: 2007-05-29T12:48:28.349220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 283.750487750051   Dec: 20.6391633973926  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.76
     Image Trigger?:     NO
     Rate S/N Ratio:     12.1243556529821  [ if not an image trigger ]
     Image S/N Ratio:    6.76

  Analysis Position:   [ source = BAT ]
    RA: 283.750487750051   Dec: 20.6391633973926  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 283.710573554232   Dec: 20.6570580754761  [deg; J2000]  
        { 18h 54m 50.5s , +20d 39' 25.4" }
         +/- 1.85208645026671 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.06217211359147 [arcmin] (formal 1-sigma fit error)
    SNR: 12.6108732097534
 
  Angular difference between the analysis and refined position is 2.484943 arcmin
 
  Partial Coding Fraction: 0.1699219    [ including projection effects ]

  Duration
     T90: 108.90000000596 +/- 20.731834542909
        Measured from: 3.37999999523163
                   to: 112.280000001192     [s; relative to TRIGTIME]
     T50: 54.9920000135899 +/- 8.41497044437814
        Measured from: 13.9760000109673
                   to: 68.9680000245571     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.36399999260902     
                   to: 3.36399999260902     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 2.36000001430511     
                   to: 120.888000011444     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.791069   1.311019   1.124310   0.355189
           0.107652   0.112814   0.099829   0.084344 [error]
 Peak      0.027148   0.070842   0.060171   0.016868
           0.012485   0.014056   0.013144   0.010678 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  118.528    2.360  120.888
T90   108.900    3.380  112.280
T50    54.992   13.976   68.968
Peak    1.000    2.364    3.364
 
 
====== 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      -1.365    -0.158      0.159       -           -               -         2.15e-03     -1.93e-04          1.93e-04      52.780   57
CPL     -1.297    -0.215      0.617      505.014    -505.014      -505.014      2.32e-03     -7.61e-04          2.18e-03      52.760   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      -1.487     -0.406     0.388       -           -               -         1.17e-02     -2.94e-03          2.90e-03      41.940   57
CPL     -0.237     -0.986     2.245       73.668     -24.311       -73.668      4.76e-02     -4.76e-02          4.48e-01      40.070   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   2.86e-07  5.71e-07  8.87e-07  3.03e-06  2.48e-06  4.77e-06   erg/cm2
      90%_error_low -4.70e-08 -5.79e-08 -9.82e-08 -6.78e-07 -2.42e-07 -7.52e-07   erg/cm2
      90%_error_hi   4.93e-08  5.71e-08  9.72e-08  8.04e-07  2.43e-07  8.54e-07   erg/cm2
Peak flux       PL   4.76e-01  4.83e-01  3.45e-01  3.92e-01  1.46e+00  1.70e+00   ph/cm2/s
      90%_error_low -1.75e-01 -1.23e-01 -1.06e-01 -1.96e-01 -3.55e-01 -4.16e-01   ph/cm2/s
      90%_error_hi   1.95e-01  1.22e-01  1.05e-01  2.80e-01  3.56e-01  4.22e-01   ph/cm2/s
 
Fluence        CPL   2.83e-07  5.75e-07  8.92e-07  2.74e-06  2.47e-06  4.49e-06   erg/cm2
      90%_error_low -5.61e-08 -6.07e-08 -1.02e-07 -1.53e-06 -2.58e-07 -1.53e-06   erg/cm2
      90%_error_hi   4.57e-08  6.63e-08  1.09e-07  4.80e-07  2.51e-07  5.45e-07   erg/cm2
Peak flux      CPL   3.70e-01  5.35e-01  3.90e-01  1.43e-01  1.40e+00  1.44e+00   ph/cm2/s
      90%_error_low -2.11e-01 -1.45e-01 -1.27e-01 -1.43e-01 -3.64e-01 -3.90e-01   ph/cm2/s
      90%_error_hi   2.34e-01  1.53e-01  1.33e-01  3.55e-01  3.65e-01  4.92e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  283.7106    20.6571   0.0153    41.1262    45.0049         2.3955611     12.611 TRIG_00280706                 
 
Foreground time interval of the image:
  2.360  55.365 (delta_t =  53.005 [sec])
Background time interval of the image:
-239.336   2.360 (delta_t = 241.696 [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    2.360 sec. to  120.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36536     ( -0.158217   0.159468 )
Norm@50keV  : 2.14590E-03    ( -0.000192854   0.000192726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.78 using 59 PHA bins.
# Reduced chi-squared =         0.9260 for     57 degrees of freedom 
# Null hypothesis probability =   6.338731e-01
 
Photon flux (15-150 keV)    in 118.5 sec: 0.259354 ( -0.024361  0.024446 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.47548e-06 ( -2.41707e-07  2.4333e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.360 sec. to  120.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29704     ( -0.214589   0.617798 )
Epeak [keV] : 505.014      ( -557.357 -557.357 )
Norm@50keV  : 2.31569E-03    ( -0.000756563   0.00218297 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.76 using 59 PHA bins.
# Reduced chi-squared =         0.9421 for     56 degrees of freedom 
# Null hypothesis probability =   5.982883e-01
 
Photon flux (15-150 keV)    in 118.5 sec: 0.258605 ( -0.025162  0.02449 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4654e-06 ( -2.58374e-07  2.50962e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.364 sec. to    3.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.4869     ( -0.406351   0.388513 )
Norm@50keV  : 1.17199E-02    ( -0.00293985   0.00290331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.94 using 59 PHA bins.
# Reduced chi-squared =         0.7358 for     57 degrees of freedom 
# Null hypothesis probability =   9.323989e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.45806 ( -0.35476  0.35552 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11435e-07 ( -3.0004e-08  3.06833e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.364 sec. to    3.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.236899     ( -0.984133   2.24596 )
Epeak [keV] : 73.6675      ( -24.3408 -73.6974 )
Norm@50keV  : 4.76288E-02    ( -0.0475609   0.448126 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.07 using 59 PHA bins.
# Reduced chi-squared =         0.7156 for     56 degrees of freedom 
# Null hypothesis probability =   9.465650e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.39700 ( -0.3641  0.36453 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.05628e-07 ( -2.97999e-08  3.14507e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 108.9 sec.
Hardness ratio (energy fluence ratio) = 1.55256552538

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

S(15-50 keV)  = 8.574324e-07
S(50-150 keV) = 1.6180259e-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 = 6.173643332742663E-01, IMY = -6.174707642141680E-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:
-239.336000 2.360000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6272  35.1907    0.0  20.2   88.5   0.1992   1.1   12.3	Her X-1                       
299.5831  35.1899    0.5  36.8   13.4   5.5720  24.6    0.8	Cyg X-1                       
308.1584  40.7693    5.0  37.7   -1.0   0.5653   2.3   11.2	Cyg X-3                       
326.2028  38.4959    4.5  49.5  -12.3   0.9715   2.6   10.6	Cyg X-2                       
308.1045  37.6299    2.1  39.8    2.8   1.3757   5.5 ------	UNKNOWN                       
172.2147  33.0295    3.4  59.0 -166.1   4.3210   3.4 ------	UNKNOWN                       
169.6595  34.4326    2.8  59.4 -163.2   5.8974   4.1 ------	UNKNOWN                       
355.9979  62.9228    3.8  47.2  -53.2   2.4709   3.1 ------	UNKNOWN                       

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

Time interval of the image:
2.360000 55.364590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6272  35.1907    0.0  20.2   88.5   0.0456   0.5   12.3	Her X-1                       
299.5772  35.2627    4.9  36.7   13.4   0.2375   2.3    3.7	Cyg X-1                       
307.9153  40.9264    5.7  37.5   -1.0   0.2190   2.0    9.0	Cyg X-3                       
326.2076  38.4884   25.5  49.5  -12.3  -0.0671  -0.5   10.1	Cyg X-2                       
283.7106  20.6569    0.9  41.1   45.0   2.3965  12.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
119.764590 962.695400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6925  35.3821    0.0  29.4  173.0   0.9829   1.8   11.7	Her X-1                       
268.3412  -1.5500    3.6  26.8   82.8   2.1850   3.2    6.1	SW J1753.5-0127               
274.0109 -13.9929    6.4  35.9   63.0   1.9037   1.8    2.6	GX 17+2                       
285.0052 -24.8913   33.0  45.5   45.1  -0.6799  -0.3    2.4	HT1900.1-2455                 
288.8019  10.9414    0.4  10.8   19.3  13.5321  32.5    0.3	GRS 1915+105                  
299.5878  35.2038    0.3  20.2  -93.0  21.5218  43.2    0.2	Cyg X-1                       
308.1139  40.8725    5.5  28.9  -93.2   1.4243   2.1    4.8	Cyg X-3                       
326.1916  38.1987  143.0  40.5  -78.5   0.1583   0.1    7.4	Cyg X-2                       
241.7182  32.8392    3.2  39.2  163.8   2.8196   3.6 ------	UNKNOWN                       
231.8822  53.9187    2.6  51.3 -169.7   5.2349   4.4 ------	UNKNOWN                       
308.0453  37.6448    1.7  27.1  -87.6   4.6985   6.7 ------	UNKNOWN                       
260.9025  62.4645    3.0  44.7 -148.1   3.7551   3.8 ------	UNKNOWN                       
320.0019  50.1699    3.7  41.1  -98.1   8.5394   3.2 ------	UNKNOWN                       
334.3820  20.8546    3.8  47.1  -53.1   7.0845   3.1 ------	UNKNOWN                       
324.4091  43.8302    4.2  40.9  -87.4   6.3642   2.8 ------	UNKNOWN