GRB080613B: 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 01:08:15 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger313954
======================================================================

  Trigger: 00313954      Segment: 000

  BAT Trigger Time: 235048360.832   [s; MET]
      Trigger Stop: 235048361.088   [s; MET]
               UTC: 2008-06-13T11:12:37.968880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 173.79663866518   Dec: -7.09837558340558  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.32
     Image Trigger?:     NO
     Rate S/N Ratio:     57.0087712549569  [ if not an image trigger ]
     Image S/N Ratio:    11.32

  Analysis Position:   [ source = BAT ]
    RA: 173.79663866518   Dec: -7.09837558340558  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 173.805091560328   Dec: -7.10155640158559  [deg; J2000]  
        { 11h 35m 13.2s , -07d 06' 05.6" }
         +/- 0.616732357783413 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.204414511703529 [arcmin] (formal 1-sigma fit error)
    SNR: 60.6708650546367
 
  Angular difference between the analysis and refined position is 0.538255 arcmin
 
  Partial Coding Fraction: 0.890625    [ including projection effects ]

  Duration
     T90: 79.4480000138283 +/- 9.4565693400353
        Measured from: -1.3759999871254
                   to: 78.0720000267029     [s; relative to TRIGTIME]
     T50: 25.8240000009537 +/- 1.42303899224837
        Measured from: 6.95200002193451
                   to: 32.7760000228882     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 2.22800001502037     
                   to: 3.22800001502037     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.283999979496     
                   to: 129.836000025272     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.076983   3.170205   2.655151   0.891102
           0.059143   0.062684   0.056408   0.049633 [error]
 Peak      0.055471   0.109308   0.140689   0.059798
           0.006231   0.007391   0.007560   0.006723 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  135.120   -5.284  129.836
T90    79.448   -1.376   78.072
T50    25.824    6.952   32.776
Peak    1.000    2.228    3.228
 
 
====== 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      -1.332    -0.048      0.048       -           -               -         4.31e-03     -1.05e-04          1.05e-04      54.610   57
CPL     -1.295    -0.082      0.054      999.053    -999.053      -999.053      4.49e-03     -2.68e-04          2.61e-04      55.610   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      -0.745     -0.116     0.119       -           -               -         2.39e-02     -1.58e-03          1.57e-03      54.310   57
CPL     -0.738     -0.115     0.121     9999.350    -9999.350      -9999.350      2.40e-02     -1.43e-03          1.01e-02      54.330   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   6.36e-07  1.30e-06  2.06e-06  7.27e-06  5.72e-06  1.13e-05   erg/cm2
      90%_error_low -3.32e-08 -3.88e-08 -5.91e-08 -4.90e-07 -1.47e-07 -5.15e-07   erg/cm2
      90%_error_hi   3.39e-08  3.87e-08  5.89e-08  5.15e-07  1.47e-07  5.37e-07   erg/cm2
Peak flux       PL   4.78e-01  7.58e-01  9.04e-01  2.10e+00  2.75e+00  4.24e+00   ph/cm2/s
      90%_error_low -6.82e-02 -6.68e-02 -5.85e-02 -2.96e-01 -1.75e-01 -3.17e-01   ph/cm2/s
      90%_error_hi   7.21e-02  6.61e-02  5.83e-02  3.30e-01  1.76e-01  3.31e-01   ph/cm2/s
 
Fluence        CPL   6.35e-07  1.29e-06  2.04e-06  7.46e-06  5.75e-06  1.12e-05   erg/cm2
      90%_error_low    N/A    -3.27e-08    N/A    -1.16e-06 -1.83e-07 -9.04e-07   erg/cm2
      90%_error_hi     N/A     4.48e-08    N/A     1.41e-08  1.11e-07  5.26e-07   erg/cm2
Peak flux      CPL   4.77e-01  7.57e-01  9.01e-01  2.22e+00  2.75e+00  4.34e+00   ph/cm2/s
      90%_error_low     N/A   -6.54e-02 -5.72e-02 -8.13e-01 -1.85e-01 -7.81e-01   ph/cm2/s
      90%_error_hi      N/A    6.89e-02  6.67e-02  -9.32e-02  1.79e-01  1.98e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  173.8051    -7.1016   0.0032    24.1816     4.5992         3.6077364     60.671 TRIG_00313954                 
 
Foreground time interval of the image:
 -5.284  13.069 (delta_t =  18.353 [sec])
Background time interval of the image:
-239.832  -5.284 (delta_t = 234.548 [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   -5.284 sec. to  129.836 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33212     ( -0.0476329   0.047855 )
Norm@50keV  : 4.31470E-03    ( -0.000104787   0.000104732 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.61 using 59 PHA bins.
# Reduced chi-squared =         0.9580 for     57 degrees of freedom 
# Null hypothesis probability =   5.654444e-01
 
Photon flux (15-150 keV)    in 135.1 sec: 0.517927 ( -0.01391  0.013968 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.71709e-06 ( -1.46579e-07  1.46924e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -5.284 sec. to  129.836 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.33043     ( -0.0463028   0.0893692 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 4.32258E-03    ( -0.00010468   0.000423743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.72 using 59 PHA bins.
# Reduced chi-squared =         0.9771 for     56 degrees of freedom 
# Null hypothesis probability =   5.235897e-01
 
Photon flux (15-150 keV)    in 135.1 sec: 0.522152 ( -0.018279  0.009582 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.75169e-06 ( -1.82846e-07  1.1057e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    2.228 sec. to    3.228 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.744502     ( -0.115558   0.118734 )
Norm@50keV  : 2.38537E-02    ( -0.00157979   0.00156619 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.31 using 59 PHA bins.
# Reduced chi-squared =         0.9528 for     57 degrees of freedom 
# Null hypothesis probability =   5.766764e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.74876 ( -0.17531  0.17561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85496e-07 ( -1.93377e-08  1.94128e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.228 sec. to    3.228 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.738233     ( -0.115303   0.121279 )
Epeak [keV] : 9999.35      ( -9999.36 -9999.36 )
Norm@50keV  : 2.39681E-02    ( -0.00149821   0.0100607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.33 using 59 PHA bins.
# Reduced chi-squared =         0.9702 for     56 degrees of freedom 
# Null hypothesis probability =   5.381642e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.75142 ( -0.1849  0.17943 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.86108e-07 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 79.448 sec.
Hardness ratio (energy fluence ratio) = 1.58880215892

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

S(15-50 keV)  = 1.9315347e-06
S(50-150 keV) = 3.785646e-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 = 4.475861496632544E-01, IMY = -3.600562921280936E-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:
-239.832000 -5.284000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5262 -40.5481    0.4  23.9 -163.0   4.7210  25.9    0.4	Vela X-1                      
170.4539 -60.6026    2.5  34.4  138.0   1.4653   4.6    4.2	Cen X-3                       
186.6113 -62.7166    7.2  39.9  128.5   0.8148   1.6    3.5	GX 301-2                      
193.3668 -31.7757    2.4  29.8   74.9   1.4103   4.9 ------	UNKNOWN                       
169.8290 -24.6541    2.4   9.7   45.6   0.7685   4.9 ------	UNKNOWN                       
183.5003   7.1500    2.5  41.4    5.3   1.2945   4.6 ------	UNKNOWN                       
 86.2651 -49.6195    3.5  59.1 -166.2   4.2633   3.3 ------	UNKNOWN                       
138.3801   7.2071    2.4  39.8  -66.2   2.7638   4.9 ------	UNKNOWN                       
 95.0508 -32.7315    4.9  55.2 -145.1   2.8397   2.4 ------	UNKNOWN                       
145.5851  19.3666    2.9  48.3  -50.0   3.9908   3.9 ------	UNKNOWN                       

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

Time interval of the image:
-5.284000 13.068600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4289 -40.5961    2.6  24.0 -163.0  -0.2312  -4.4    5.2	Vela X-1                      
169.9036 -60.6996    0.0  34.4  138.5   0.1280   1.3   13.0	Cen X-3                       
186.6276 -62.6391    5.4  39.8  128.4  -0.3118  -2.1    7.9	GX 301-2                      
184.1285 -73.9759    2.2  48.7  138.7   1.3279   5.2 ------	UNKNOWN                       
197.0017  12.0616    2.0  53.5   15.5   1.4076   5.9 ------	UNKNOWN                       
173.8051  -7.1016    0.2  24.2    4.6   3.6078  60.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
58.668600 962.203800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5348 -40.5506    0.7  47.8 -163.3  16.8993  16.3    0.4	Vela X-1                      
170.5251 -60.6502    5.9  53.6  159.2   5.1779   1.9    6.4	Cen X-3                       
198.2218 -41.4579    2.9  40.6  128.8   5.0031   4.0 ------	UNKNOWN                       
194.6408  29.0729    3.3  41.4    5.3   2.3605   3.5 ------	UNKNOWN                       
151.9474  39.4633    4.2  50.8  -44.5   7.9730   2.8 ------	UNKNOWN                       
125.3444 -17.4977    3.0  48.3 -129.9   7.6147   3.8 ------	UNKNOWN