GRB070729: 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 08:12:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger286373
======================================================================

  Trigger: 00286373      Segment: 000

  BAT Trigger Time: 207361556.032   [s; MET]
      Trigger Stop: 207361557.056   [s; MET]
               UTC: 2007-07-29T00:25:53.913580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 56.3223396303976   Dec: -39.3118189788734  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.09
     Image Trigger?:     NO
     Rate S/N Ratio:     21.4941852602047  [ if not an image trigger ]
     Image S/N Ratio:    7.09

  Analysis Position:   [ source = BAT ]
    RA: 56.3223396303976   Dec: -39.3118189788734  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 56.2907674977778   Dec: -39.3300297545073  [deg; J2000]  
        { 03h 45m 09.8s , -39d 19' 48.1" }
         +/- 2.10886229460735 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.858033151566055 [arcmin] (formal 1-sigma fit error)
    SNR: 10.4759242315503
 
  Angular difference between the analysis and refined position is 1.827970 arcmin
 
  Partial Coding Fraction: 0.65625    [ including projection effects ]

  Duration
     T90: 0.98800003528595 +/- 0.166901148041195
        Measured from: 0.0199999809265137
                   to: 1.00800001621246     [s; relative to TRIGTIME]
     T50: 0.564000010490417 +/- 0.129799827930591
        Measured from: 0.211999982595444
                   to: 0.775999993085861     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0279999971389771     
                   to: 1.02799999713898     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0680000185966492     
                   to: 1.07600000500679     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.024224   0.039841   0.051912   0.023728
           0.006394   0.007082   0.006828   0.006090 [error]
 Peak      0.018106   0.038134   0.047996   0.024588
           0.006016   0.006703   0.006493   0.005763 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    1.144   -0.068    1.076
T90     0.988    0.020    1.008
T50     0.564    0.212    0.776
Peak    1.000    0.028    1.028
 
 
====== 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      -0.890    -0.263      0.281       -           -               -         7.98e-03     -1.28e-03          1.27e-03      58.340   57
CPL     -0.322    -0.694      1.517      174.632    -174.632      -174.632      1.40e-02     -7.05e-03          4.35e-02      57.630   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      -0.802     -0.270     0.292       -           -               -         8.34e-03     -1.42e-03          1.39e-03      57.380   57
CPL     -0.210     -0.808     1.525      181.860    -181.860      -181.860      1.49e-02     -7.60e-03          4.54e-02      56.640   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   6.61e-09  1.77e-08  3.82e-08  2.14e-07  1.03e-07  2.77e-07   erg/cm2
      90%_error_low -2.07e-09 -3.58e-09 -6.19e-09 -7.02e-08 -1.65e-08 -7.39e-08   erg/cm2
      90%_error_hi   2.33e-09  3.50e-09  6.12e-09  9.31e-08  1.66e-08  9.40e-08   erg/cm2
Peak flux       PL   1.77e-01  2.70e-01  3.10e-01  6.80e-01  9.59e-01  1.44e+00   ph/cm2/s
      90%_error_low -5.92e-02 -6.02e-02 -4.90e-02 -2.08e-01 -1.57e-01 -2.44e-01   ph/cm2/s
      90%_error_hi   6.79e-02  5.93e-02  4.88e-02  2.66e-01  1.58e-01  2.61e-01   ph/cm2/s
 
Fluence        CPL   5.67e-09  1.82e-08  4.06e-08  1.09e-07  1.00e-07  1.74e-07   erg/cm2
      90%_error_low -2.65e-09 -3.89e-09 -7.71e-09 -7.55e-08 -1.80e-08 -7.64e-08   erg/cm2
      90%_error_hi   2.88e-09  3.99e-09  8.10e-09  1.81e-07  1.75e-08  1.32e-07   erg/cm2
Peak flux      CPL   1.48e-01  2.76e-01  3.33e-01  4.01e-01  9.39e-01  1.16e+00   ph/cm2/s
      90%_error_low -7.34e-02 -6.50e-02 -6.35e-02 -2.44e-01 -1.62e-01 -3.05e-01   ph/cm2/s
      90%_error_hi   8.43e-02  6.42e-02  6.75e-02  3.59e-01  1.63e-01  4.07e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   56.2908   -39.3300   0.0183    34.3692     2.3927         0.1398151     10.476 TRIG_00286373                 
 
Foreground time interval of the image:
 -0.068   1.076 (delta_t =   1.144 [sec])
Background time interval of the image:
-239.032  -0.068 (delta_t = 238.964 [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   -0.068 sec. to    1.076 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.890379     ( -0.263454   0.280981 )
Norm@50keV  : 7.97894E-03    ( -0.00128425   0.00126532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.34 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     57 degrees of freedom 
# Null hypothesis probability =   4.260419e-01
 
Photon flux (15-150 keV)    in 1.144 sec: 0.915738 ( -0.14592  0.146742 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.02836e-07 ( -1.65432e-08  1.66302e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.068 sec. to    1.076 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.321707     ( -0.693954   1.51725 )
Epeak [keV] : 174.632      ( -174.617 -174.617 )
Norm@50keV  : 1.40186E-02    ( -0.00704798   0.0435379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.63 using 59 PHA bins.
# Reduced chi-squared =          1.029 for     56 degrees of freedom 
# Null hypothesis probability =   4.147648e-01
 
Photon flux (15-150 keV)    in 1.144 sec: 0.895531 ( -0.15278  0.152369 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.00368e-07 ( -1.80442e-08  1.75189e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.028 sec. to    1.028 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.802175     ( -0.269559   0.2916 )
Norm@50keV  : 8.34414E-03    ( -0.00141601   0.00138512 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.38 using 59 PHA bins.
# Reduced chi-squared =          1.007 for     57 degrees of freedom 
# Null hypothesis probability =   4.609700e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.958927 ( -0.156621  0.157683 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.74294e-08 ( -1.57843e-08  1.58524e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.028 sec. to    1.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.209986     ( -0.808191   1.52539 )
Epeak [keV] : 181.860      ( -181.885 -181.885 )
Norm@50keV  : 1.48534E-02    ( -0.0076023   0.0453767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.64 using 59 PHA bins.
# Reduced chi-squared =          1.011 for     56 degrees of freedom 
# Null hypothesis probability =   4.510627e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.938613 ( -0.161907  0.162587 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.52072e-08 ( -1.71901e-08  1.66361e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.988 sec.
Hardness ratio (energy fluence ratio) = 2.15794406479

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

S(15-50 keV)  = 2.4286615e-08
S(50-150 keV) = 7.85486e-08

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 = 6.833278986216549E-01, IMY = -2.855262225315715E-02

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:
-239.032000 -0.068000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 16.9262 -52.8885    2.2  47.5   44.5   3.5523   5.2 ------	UNKNOWN                       
  1.7602  -7.4599    2.7  36.6  116.1   1.6194   4.2  459.8	UNKNOWN                       
  7.9220  40.5970    3.6  56.9  179.2   3.1485   3.2 ------	UNKNOWN                       
 39.2413  -2.1963    2.3   6.6 -148.5   0.7410   5.0 ------	UNKNOWN                       
 21.8361  48.3440    2.3  59.0 -166.2   5.4039   5.2 ------	UNKNOWN                       
 75.5688   1.0244    2.4  38.0  -76.3   2.0730   4.8 ------	UNKNOWN                       

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

Time interval of the image:
-0.068000 1.076000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 31.5467 -36.8812    2.1  28.8   38.8   0.0758   5.4 ------	UNKNOWN                       
 43.2271 -38.3409    2.5  29.8   19.7   0.0579   4.6 ------	UNKNOWN                       
 56.2907 -39.3300    1.1  34.4    2.4   0.1398  10.5 ------	UNKNOWN                       
 85.7123 -43.1810    2.4  53.4  -14.8   0.1404   4.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
71.268600 623.068600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
168.5867 -84.4902    2.8  52.9   19.7   5.3255   4.1 ------	UNKNOWN                       
 32.6819  10.1710    3.2  54.2  177.0   3.9887   3.6 ------	UNKNOWN                       
122.4270 -48.8131    3.0  46.9  -29.5   2.1514   3.8 ------	UNKNOWN                       
121.9708 -36.7829    3.3  50.6  -44.7   5.5811   3.5 ------	UNKNOWN                       
117.4344 -33.9996    2.6  48.4  -50.1   6.8780   4.5 ------	UNKNOWN