GRB060424: 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: Wed Jan 22 17:18:22 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger206773
======================================================================

  Trigger: 00206773      Segment: 000

  BAT Trigger Time: 167544980.672   [s; MET]
      Trigger Stop: 167544981.696   [s; MET]
               UTC: 2006-04-24T04:16:19.520420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 7.35525645990139   Dec: 36.8198378270448  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.1
     Image Trigger?:     NO
     Rate S/N Ratio:     21.2132034355964  [ if not an image trigger ]
     Image S/N Ratio:    10.1

  Analysis Position:   [ source = BAT ]
    RA: 7.35525645990139   Dec: 36.8198378270448  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 7.35897766896579   Dec: 36.7845636298646  [deg; J2000]  
        { 00h 29m 26.2s , +36d 47' 04.4" }
         +/- 1.70236221959549 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.813305717588225 [arcmin] (formal 1-sigma fit error)
    SNR: 14.2247333353899
 
  Angular difference between the analysis and refined position is 2.123989 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 37.6800000071526 +/- 3.47315419041859
        Measured from: -17.8439999818802
                   to: 19.8360000252724     [s; relative to TRIGTIME]
     T50: 11.5440000295639 +/- 8.376860001479
        Measured from: -8.36800000071526
                   to: 3.17600002884865     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.108000010251999     
                   to: 1.108000010252     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.4599999785423     
                   to: 20.4760000109673     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.371056   0.428516   0.278942   0.041417
           0.039724   0.041268   0.035770   0.030336 [error]
 Peak      0.060524   0.075356   0.046287   0.006741
           0.007139   0.007780   0.006821   0.004791 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   40.936  -20.460   20.476
T90    37.680  -17.844   19.836
T50    11.544   -8.368    3.176
Peak    1.000    0.108    1.108
 
 
====== 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      -1.698    -0.185      0.180       -           -               -         1.81e-03     -2.08e-04          2.05e-04      61.720   57
CPL     -1.190    -0.625      0.819       73.363     -23.300       -73.363      3.41e-03     -1.72e-03          5.89e-03      60.200   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      -1.694     -0.201     0.193       -           -               -         1.23e-02     -1.57e-03          1.55e-03      50.360   57
CPL     -0.897     -0.863     1.104       63.629     -16.221       -63.629      3.33e-02     -3.33e-02          9.74e-02      48.050   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   1.14e-07  1.85e-07  2.29e-07  5.57e-07  6.86e-07  1.09e-06   erg/cm2
      90%_error_low -1.79e-08 -1.93e-08 -3.50e-08 -1.57e-07 -8.23e-08 -1.93e-07   erg/cm2
      90%_error_hi   1.85e-08  1.93e-08  3.51e-08  1.93e-07  8.34e-08  2.22e-07   erg/cm2
Peak flux       PL   6.11e-01  5.48e-01  3.39e-01  3.19e-01  1.63e+00  1.82e+00   ph/cm2/s
      90%_error_low -1.05e-01 -6.36e-02 -5.55e-02 -9.17e-02 -1.88e-01 -2.11e-01   ph/cm2/s
      90%_error_hi   1.10e-01  6.34e-02  5.53e-02  1.11e-01  1.88e-01  2.12e-01   ph/cm2/s
 
Fluence        CPL   1.07e-07  1.97e-07  2.31e-07  2.51e-07  6.56e-07  7.87e-07   erg/cm2
      90%_error_low -2.07e-08 -2.49e-08 -3.80e-08 -1.59e-07 -9.07e-08 -1.86e-07   erg/cm2
      90%_error_hi   2.07e-08  2.58e-08  3.80e-08  3.62e-07  9.28e-08  3.84e-07   erg/cm2
Peak flux      CPL   5.50e-01  5.99e-01  3.51e-01  1.31e-01  1.59e+00  1.63e+00   ph/cm2/s
      90%_error_low -1.28e-01 -8.48e-02 -6.26e-02 -8.35e-02 -1.96e-01 -2.19e-01   ph/cm2/s
      90%_error_hi   1.29e-01  8.86e-02  6.30e-02  2.21e-01  1.95e-01  2.73e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    7.3590    36.7846   0.0136    29.6909   -64.1589         1.1365816     14.225 TRIG_00206773                 
 
Foreground time interval of the image:
-20.460  20.476 (delta_t =  40.936 [sec])
Background time interval of the image:
-239.672 -20.460 (delta_t = 219.212 [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  -20.460 sec. to   20.476 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69785     ( -0.184898   0.179821 )
Norm@50keV  : 1.80876E-03    ( -0.00020791   0.000204879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.72 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     57 degrees of freedom 
# Null hypothesis probability =   3.113127e-01
 
Photon flux (15-150 keV)    in 40.94 sec: 0.240053 ( -0.025011  0.025028 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.85831e-07 ( -8.22607e-08  8.34198e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -20.460 sec. to   20.476 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19049     ( -0.624674   0.818533 )
Epeak [keV] : 73.3627      ( -23.2996 -73.3628 )
Norm@50keV  : 3.40635E-03    ( -0.00172359   0.00589051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.20 using 59 PHA bins.
# Reduced chi-squared =          1.075 for     56 degrees of freedom 
# Null hypothesis probability =   3.263862e-01
 
Photon flux (15-150 keV)    in 40.94 sec: 0.235405 ( -0.025871  0.025837 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.55658e-07 ( -9.06981e-08  9.27659e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.108 sec. to    1.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69424     ( -0.201324   0.193459 )
Norm@50keV  : 1.23190E-02    ( -0.00157485   0.00154891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.36 using 59 PHA bins.
# Reduced chi-squared =         0.8836 for     57 degrees of freedom 
# Null hypothesis probability =   7.204935e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.63289 ( -0.18783  0.18792 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.14127e-07 ( -1.52079e-08  1.54178e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.108 sec. to    1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.896995     ( -0.863282   1.10424 )
Epeak [keV] : 63.6293      ( -16.2185 -63.6264 )
Norm@50keV  : 3.32965E-02    ( -0.033302   0.0973985 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.05 using 59 PHA bins.
# Reduced chi-squared =         0.8579 for     56 degrees of freedom 
# Null hypothesis probability =   7.662995e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.58976 ( -0.19567  0.19469 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.07137e-07 ( -1.67429e-08  1.72915e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 37.68 sec.
Hardness ratio (energy fluence ratio) = 1.23301998834

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

S(15-50 keV)  = 2.993758e-07
S(50-150 keV) = 3.864661e-07

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 = 2.485279971674947E-01, IMY = 5.131652843505772E-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:
-239.672000 -20.460000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5946  35.1959    0.5  38.6   41.9   7.5167  21.5    0.4	Cyg X-1                       
308.2882  40.9820    4.8  30.1   36.9   0.4838   2.4    8.3	Cyg X-3                       
326.1650  38.3172   13.3  26.6    8.1   0.1390   0.9    0.4	Cyg X-2                       
150.2823  61.7235    3.4  55.2  163.9   3.3199   3.4 ------	UNKNOWN                       
124.6615  62.4064    3.1  51.5  178.1   1.4377   3.7 ------	UNKNOWN                       
108.7735  50.2292    3.8  59.0 -166.1   3.0043   3.1 ------	UNKNOWN                       

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

Time interval of the image:
-20.460000 20.476000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.7933  35.1189   23.7  38.6   41.7  -0.0624  -0.5   11.1	Cyg X-1                       
307.9702  41.0933    7.2  30.2   37.5   0.1401   1.6   10.6	Cyg X-3                       
326.1694  38.3220 1387.5  26.6    8.1  -0.0005  -0.0    0.1	Cyg X-2                       
313.2330  21.8908    2.7  45.7   17.4   0.5927   4.2 ------	UNKNOWN                       
331.1842  30.4464    2.0  33.2   -3.8   0.4242   5.6 ------	UNKNOWN                       
 94.6240  56.4156    2.6  49.5 -160.9   0.5568   4.4 ------	UNKNOWN                       
 23.0610  50.0361    2.7  24.6 -101.3   0.3223   4.2 ------	UNKNOWN                       
  7.3590  36.7846    0.8  29.7  -64.2   1.1362  14.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
341.928600 962.408000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6316  22.0213    0.4  50.6  -17.0  24.0855  31.7    0.4	Crab                          
110.6312 -17.7435    2.7  38.5   51.6   3.5735   4.2 ------	UNKNOWN                       
 37.8174 -73.1204    3.9  49.4  158.4   2.8383   3.0 ------	UNKNOWN                       
 98.7557   6.8104    3.0  43.7   10.4   1.9973   3.8 ------	UNKNOWN                       
359.3168 -49.8207    3.0  57.7 -167.3   6.4175   3.9 ------	UNKNOWN                       
 64.9964  10.2442    3.6  37.4  -41.5   1.4443   3.2 ------	UNKNOWN                       
 12.0325 -26.0781    2.7  51.4 -136.5   9.3437   4.2 ------	UNKNOWN