GRB080604: 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 01:24:57 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger313116
======================================================================

  Trigger: 00313116      Segment: 000

  BAT Trigger Time: 234257224   [s; MET]
      Trigger Stop: 234257288   [s; MET]
               UTC: 2008-06-04T07:27:01.159600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 236.969995263586   Dec: 20.5553515503071  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.68
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11.68

  Analysis Position:   [ source = BAT ]
    RA: 236.969995263586   Dec: 20.5553515503071  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 236.957556880434   Dec: 20.5593469152126  [deg; J2000]  
        { 15h 47m 49.8s , +20d 33' 33.6" }
         +/- 1.99284906511066 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.756041427085413 [arcmin] (formal 1-sigma fit error)
    SNR: 11.3578936597447
 
  Angular difference between the analysis and refined position is 0.738755 arcmin
 
  Partial Coding Fraction: 1.03125    [ including projection effects ]

  Duration
     T90: 77.608000010252 +/- 13.2472380709174
        Measured from: -24.33599999547
                   to: 53.272000014782     [s; relative to TRIGTIME]
     T50: 33.3560000061989 +/- 7.94457599923189
        Measured from: -3.42800000309944
                   to: 29.9280000030994     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -3.03600001335144     
                   to: -2.03600001335144     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -28.2639999985695     
                   to: 58.608000010252     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.449206   0.559082   0.322661   0.032594
           0.046664   0.045382   0.040086   0.034979 [error]
 Peak      0.013254   0.016385   0.014667   0.009566
           0.005082   0.004836   0.004291   0.003756 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   86.872  -28.264   58.608
T90    77.608  -24.336   53.272
T50    33.356   -3.428   29.928
Peak    1.000   -3.036   -2.036
 
 
====== 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      -1.678    -0.174      0.171       -           -               -         9.79e-04     -1.05e-04          1.04e-04      65.350   57
CPL     -1.194    -0.599      0.835       72.327     -22.363       -72.327      1.83e-03     -9.26e-04          3.60e-03      63.920   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      -1.293     -0.531     0.540       -           -               -         3.18e-03     -9.11e-04          9.10e-04      35.890   57
CPL     -0.931     -1.653     2.482      155.283    -155.283      -155.283      4.76e-03     -4.76e-03          5.64e-02      35.910   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   1.28e-07  2.12e-07  2.65e-07  6.57e-07  7.89e-07  1.26e-06   erg/cm2
      90%_error_low -1.88e-08 -2.03e-08 -3.82e-08 -1.76e-07 -8.93e-08 -2.15e-07   erg/cm2
      90%_error_hi   1.94e-08  2.03e-08  3.85e-08  2.16e-07  9.09e-08  2.48e-07   erg/cm2
Peak flux       PL   1.07e-01  1.22e-01  9.98e-02  1.36e-01  3.79e-01  4.66e-01   ph/cm2/s
      90%_error_low -5.30e-02 -4.10e-02 -3.52e-02 -7.89e-02 -1.11e-01 -1.37e-01   ph/cm2/s
      90%_error_hi   6.29e-02  3.93e-02  3.40e-02  1.30e-01  1.12e-01  1.43e-01   ph/cm2/s
 
Fluence        CPL   1.22e-07  2.25e-07  2.62e-07  2.81e-07  7.44e-07  8.89e-07   erg/cm2
      90%_error_low -2.10e-08 -2.70e-08 -4.42e-08 -1.91e-07 -1.09e-07 -2.24e-07   erg/cm2
      90%_error_hi   2.12e-08  2.83e-08  4.16e-08  4.40e-07  1.10e-07  4.66e-07   erg/cm2
Peak flux      CPL   1.04e-01  1.24e-01  1.01e-01  1.14e-01  3.77e-01  4.43e-01   ph/cm2/s
      90%_error_low -6.70e-02 -4.01e-02 -3.55e-02 -1.14e-01 -1.17e-01 -1.74e-01   ph/cm2/s
      90%_error_hi   6.56e-02  4.60e-02  4.13e-02  1.70e-01  1.12e-01  1.61e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  236.9576    20.5593   0.0169    14.6358   -17.8866         1.2366684     11.358 TRIG_00313116                 
 
Foreground time interval of the image:
-28.264  58.608 (delta_t =  86.872 [sec])
Background time interval of the image:
-239.000 -28.264 (delta_t = 210.736 [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  -28.264 sec. to   58.608 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.67837     ( -0.174371   0.170711 )
Norm@50keV  : 9.79447E-04    ( -0.000105239   0.000103788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.35 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     57 degrees of freedom 
# Null hypothesis probability =   2.092736e-01
 
Photon flux (15-150 keV)    in 86.87 sec: 0.129119 ( -0.012411  0.012417 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.89314e-07 ( -8.92789e-08  9.08625e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -28.264 sec. to   58.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19373     ( -0.599263   0.834816 )
Epeak [keV] : 72.3272      ( -22.3628 -72.3269 )
Norm@50keV  : 1.83459E-03    ( -0.000925879   0.00360131 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.92 using 59 PHA bins.
# Reduced chi-squared =          1.141 for     56 degrees of freedom 
# Null hypothesis probability =   2.182364e-01
 
Photon flux (15-150 keV)    in 86.87 sec: 0.126322 ( -0.01307  0.013028 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43961e-07 ( -1.08776e-07  1.10417e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -3.036 sec. to   -2.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29316     ( -0.530692   0.54009 )
Norm@50keV  : 3.18315E-03    ( -0.00091106   0.000909732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.89 using 59 PHA bins.
# Reduced chi-squared =         0.6297 for     57 degrees of freedom 
# Null hypothesis probability =   9.870544e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.379288 ( -0.11082  0.111607 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.15116e-08 ( -9.99518e-09  1.02686e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -3.036 sec. to   -2.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22789     ( -1.6335   2.50177 )
Epeak [keV] : 613.676      ( -554.475 -554.475 )
Norm@50keV  : 3.42090E-03    ( -0.00348142   0.0576729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.88 using 59 PHA bins.
# Reduced chi-squared =         0.6407 for     56 degrees of freedom 
# Null hypothesis probability =   9.833224e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.376504 ( -0.116816  0.11217 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.11774e-08 ( -1.09463e-08  1.05191e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 77.608 sec.
Hardness ratio (energy fluence ratio) = 1.24976977372

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

S(15-50 keV)  = 3.402206e-07
S(50-150 keV) = 4.490955e-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 = 2.485255591582526E-01, IMY = 8.020716942434582E-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:
-239.000000 -28.264000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9937 -15.6426    0.5  32.1   81.1   9.1545  25.2    0.8	Sco X-1                       
254.4744  35.3596    1.4  35.9  -21.2   1.8316   8.2    1.3	Her X-1                       
268.3541  -1.3096    5.7  43.8   40.3   1.0191   2.0    8.6	SW J1753.5-0127               
216.3023  -9.6719    2.2  22.3  143.2   0.9263   5.2 ------	UNKNOWN                       
228.0567  31.2963    3.6  21.0  -57.8   0.6729   3.8 ------	UNKNOWN                       
228.1987  31.6326    4.2  21.3  -57.5   0.6345   3.6 ------	UNKNOWN                       
188.8443   8.2466    2.5  36.7 -152.9   0.9684   4.7 ------	UNKNOWN                       

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

Time interval of the image:
-28.264000 58.608000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.1033 -15.5935    4.9  32.2   80.9   0.4821   2.3    7.7	Sco X-1                       
254.5438  35.4844   45.2  36.1  -21.3  -0.0336  -0.3    9.5	Her X-1                       
268.3891  -1.5911    5.0  43.9   40.7   0.7346   2.3    8.4	SW J1753.5-0127               
261.4211 -12.7038    2.1  42.1   59.7   2.2821   5.5 ------	UNKNOWN                       
258.2489 -13.9317    2.4  40.2   63.9   1.9674   4.8 ------	UNKNOWN                       
236.9575  20.5593    1.0  14.6  -17.9   1.2366  11.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
108.500600 963.105000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9843 -15.6331    0.5  37.0   97.8  35.2066  24.8    0.5	Sco X-1                       
254.4533  35.3453    0.6  21.3  -27.0   9.3073  20.6    0.3	Her X-1                       
268.3544  -1.3084   12.8  37.7   52.3   1.0735   0.9    8.7	SW J1753.5-0127               
288.7891  10.9435    2.2  50.6   23.3  10.1022   5.3    0.6	GRS 1915+105                  
299.5991  35.2002    0.5  56.3   -8.7  43.4614  21.2    0.4	Cyg X-1                       
186.4376  17.4114    3.2  47.7 -154.1   3.8092   3.6 ------	UNKNOWN                       
280.1053  61.6892    4.1  50.7  -44.6   7.7563   2.8 ------	UNKNOWN