GRB080723A: 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 00:08:36 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger317662
======================================================================

  Trigger: 00317662      Segment: 000

  BAT Trigger Time: 238479567.36   [s; MET]
      Trigger Stop: 238479568.384   [s; MET]
               UTC: 2008-07-23T04:19:24.398120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 274.512361086236   Dec: -6.92252284367775  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.42
     Image Trigger?:     NO
     Rate S/N Ratio:     18.0554700852678  [ if not an image trigger ]
     Image S/N Ratio:    8.42

  Analysis Position:   [ source = BAT ]
    RA: 274.512361086236   Dec: -6.92252284367775  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 274.464617812912   Dec: -6.9085814415415  [deg; J2000]  
        { 18h 17m 51.5s , -06d 54' 30.9" }
         +/- 1.62594722244821 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.555905740414327 [arcmin] (formal 1-sigma fit error)
    SNR: 15.189299482142
 
  Angular difference between the analysis and refined position is 2.964229 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 17.33599999547 +/- 2.03493585994196
        Measured from: 0.0399999916553497
                   to: 17.3759999871254     [s; relative to TRIGTIME]
     T50: 11.9000000059605 +/- 2.28275273485221
        Measured from: 1.32799997925758
                   to: 13.227999985218     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.132000029087067     
                   to: 0.867999970912933     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.232000023126602     
                   to: 18.7079999744892     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.181351   0.291706   0.119784   0.049180
           0.025803   0.024194   0.020750   0.017830 [error]
 Peak      0.029693   0.056440   0.027766   0.009796
           0.006162   0.006067   0.005319   0.004366 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   18.940   -0.232   18.708
T90    17.336    0.040   17.376
T50    11.900    1.328   13.228
Peak    1.000   -0.132    0.868
 
 
====== 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: N/A)
 
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      -1.719    -0.210      0.205       -           -               -         1.96e-03     -2.51e-04          2.47e-04      78.820   57
CPL     -1.432    -0.480      0.996       85.550     -40.277       -85.550      2.85e-03     -2.85e-03          7.88e-03      78.440   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      -1.505     -0.242     0.239       -           -               -         7.51e-03     -1.14e-03          1.13e-03      54.670   57
CPL     -0.127     -1.207     1.802       59.901     -14.560       105.626      4.34e-02     -4.34e-02          4.19e-01      50.760   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   5.82e-08  9.35e-08  1.14e-07  2.71e-07  3.43e-07  5.37e-07   erg/cm2
      90%_error_low -1.01e-08 -1.06e-08 -1.96e-08 -8.52e-08 -4.55e-08 -1.06e-07   erg/cm2
      90%_error_hi   1.04e-08  1.06e-08  1.98e-08  1.09e-07  4.65e-08  1.25e-07   erg/cm2
Peak flux       PL   3.11e-01  3.12e-01  2.20e-01  2.46e-01  9.39e-01  1.09e+00   ph/cm2/s
      90%_error_low -7.00e-02 -4.68e-02 -4.16e-02 -8.12e-02 -1.36e-01 -1.61e-01   ph/cm2/s
      90%_error_hi   7.39e-02  4.65e-02  4.16e-02  1.04e-01  1.36e-01  1.63e-01   ph/cm2/s
 
Fluence        CPL   5.66e-08  9.69e-08  1.13e-07  1.58e-07  3.31e-07  4.24e-07   erg/cm2
      90%_error_low -1.10e-08 -1.32e-08 -2.24e-08 -1.22e-07 -5.78e-08 -1.39e-07   erg/cm2
      90%_error_hi   1.12e-08  1.48e-08  2.07e-08  2.24e-07  5.52e-08  1.55e-07   erg/cm2
Peak flux      CPL   2.63e-01  3.61e-01  2.22e-01  5.39e-02  8.89e-01  9.00e-01   ph/cm2/s
      90%_error_low -8.18e-02 -6.44e-02 -5.84e-02 -5.39e-02 -1.44e-01 -1.52e-01   ph/cm2/s
      90%_error_hi   8.49e-02  7.02e-02  5.05e-02  1.43e-01  1.44e-01  1.80e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  274.4646    -6.9086   0.0126     7.1648     6.5135         0.6672551     15.189 TRIG_00317662                 
 
Foreground time interval of the image:
 -0.232  18.341 (delta_t =  18.573 [sec])
Background time interval of the image:
-239.360  -0.232 (delta_t = 239.128 [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   -0.232 sec. to   18.708 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.71851     ( -0.209822   0.20461 )
Norm@50keV  : 1.95791E-03    ( -0.000251042   0.00024667 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.82 using 59 PHA bins.
# Reduced chi-squared =          1.383 for     57 degrees of freedom 
# Null hypothesis probability =   2.939261e-02
 
Photon flux (15-150 keV)    in 18.94 sec: 0.261748 ( -0.029776  0.029798 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.42918e-07 ( -4.55462e-08  4.64854e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.232 sec. to   18.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43195     ( -0.479924   0.996253 )
Epeak [keV] : 85.5498      ( -40.3061 -85.579 )
Norm@50keV  : 2.84548E-03    ( -0.00284483   0.00787705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          78.44 using 59 PHA bins.
# Reduced chi-squared =          1.401 for     56 degrees of freedom 
# Null hypothesis probability =   2.557869e-02
 
Photon flux (15-150 keV)    in 18.94 sec: 0.258334 ( -0.031315  0.031144 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.30636e-07 ( -5.77503e-08  5.51713e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.132 sec. to    0.868 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50473     ( -0.24156   0.238937 )
Norm@50keV  : 7.51205E-03    ( -0.00113999   0.00112944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.67 using 59 PHA bins.
# Reduced chi-squared =         0.9591 for     57 degrees of freedom 
# Null hypothesis probability =   5.629653e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.939017 ( -0.136054  0.136183 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.1218e-08 ( -1.17381e-08  1.19756e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.132 sec. to    0.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.127431     ( -1.20922   1.7997 )
Epeak [keV] : 59.9005      ( -14.5084 105.677 )
Norm@50keV  : 4.34430E-02    ( -0.0436421   0.418503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.76 using 59 PHA bins.
# Reduced chi-squared =         0.9064 for     56 degrees of freedom 
# Null hypothesis probability =   6.729379e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.888666 ( -0.143502  0.143624 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.14073e-08 ( -1.34063e-08  1.46498e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = 1.248943120000310E-01, IMY = -1.425976206459038E-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:
-239.360000 -0.232000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9833 -15.6368    0.4  28.0  -94.4   7.5372  25.9    0.3	Sco X-1                       
254.4358  35.3035   22.0  52.7  -17.5   0.3079   0.5    2.6	Her X-1                       
256.1115 -37.8956    4.8  28.6 -147.1  -0.5271  -2.4    6.7	4U 1700-377                   
256.5404 -36.2887   12.8  27.2 -145.5   0.1924   0.9    9.5	GX 349+2                      
262.9174 -24.8018    6.8  15.0 -135.0   0.3513   1.7    6.0	GX 1+4                        
264.9243 -44.4105    7.2  31.3 -164.9   0.3462   1.6    8.1	4U 1735-44                    
268.3166  -1.5318    2.1  13.7  -22.0   1.0266   5.4    5.7	SW J1753.5-0127               
270.2550 -25.0967    1.3  11.6 -160.4   1.8105   9.4    1.9	GX 5-1                        
270.3666 -25.6486    3.1  12.1 -161.7   0.8143   4.2    6.6	GRS 1758-258                  
273.9749 -14.0140    2.6   0.0    8.6   0.9214   4.5    2.2	GX 17+2                       
275.8868 -30.3339    3.1  16.4  176.7   0.7760   3.8    2.8	H1820-303                     
285.0167 -24.8946   19.3  15.0  140.4   0.1199   0.6    1.9	HT1900.1-2455                 
288.7656  10.9332    1.2  29.0   33.7   2.4971   9.5    2.1	GRS 1915+105                  
262.8194 -33.7094    7.0  22.1 -152.1   0.3305   1.6   11.3	GX 354-0                      
229.3393 -44.5694    3.3  48.5 -135.5   2.4413   3.4 ------	UNKNOWN                       
236.5719  20.7690    3.3  50.6  -44.7   3.5893   3.6 ------	UNKNOWN                       
233.1975  -4.4829    2.2  41.3  -78.0   4.4714   5.3 ------	UNKNOWN                       

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

Time interval of the image:
-0.232000 18.340600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9865 -15.7136    4.5  28.0  -94.5   0.1724   2.5    4.4	Sco X-1                       
254.3885  35.3995    8.5  52.8  -17.5   0.1901   1.4    4.8	Her X-1                       
255.8706 -37.9764    5.4  28.8 -146.9  -0.1136  -2.1    9.6	4U 1700-377                   
256.3442 -36.4771    4.6  27.4 -145.5   0.1285   2.5    5.5	GX 349+2                      
262.8663 -24.5932    6.1  14.8 -134.3   0.0862   1.9   12.0	GX 1+4                        
264.9192 -44.5832   12.5  31.5 -165.0   0.0503   0.9   11.0	4U 1735-44                    
268.3948  -1.4216    6.5  13.8  -21.5   0.0793   1.8    2.5	SW J1753.5-0127               
270.4344 -25.1546   11.3  11.6 -161.3   0.0500   1.1    9.3	GX 5-1                        
270.4606 -25.5910    0.0  12.0 -162.0  -0.0767  -1.7   12.5	GRS 1758-258                  
274.0194 -14.0133   16.4   0.1   50.3  -0.0321  -0.7    1.6	GX 17+2                       
275.8818 -30.5195    9.1  16.6  176.8   0.0574   1.3    9.4	H1820-303                     
285.1093 -24.9027    5.9  15.1  140.2  -0.0927  -2.0    4.1	HT1900.1-2455                 
288.9563  10.7999    0.0  29.0   34.2  -0.0453  -0.8   12.8	GRS 1915+105                  
263.1590 -33.9919    0.0  22.2 -153.1  -0.0948  -2.0   12.7	GX 354-0                      
274.4646  -6.9086    0.8   7.2    6.5   0.6673  15.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
66.740590 962.673900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9821 -15.6398    0.3  30.2 -137.4  27.6838  34.0    0.2	Sco X-1                       
254.3755  35.4838   29.1  46.5  -50.8   1.2860   0.4    9.4	Her X-1                       
255.7821 -37.8580  191.0  35.3  178.0   0.0475   0.1    9.7	4U 1700-377                   
256.4907 -36.4600    4.0  33.8  178.5   2.1962   2.9    3.5	GX 349+2                      
263.2260 -24.6900    0.0  20.8 -177.9   1.1617   2.0   12.3	GX 1+4                        
264.7100 -44.3007    6.4  38.4  163.3   1.9233   1.8    9.1	4U 1735-44                    
268.3560  -1.4337    1.8   8.2  -76.6   4.0883   6.4    1.3	SW J1753.5-0127               
270.2759 -25.1106    1.0  18.6  164.1   7.0096  11.3    1.9	GX 5-1                        
270.1596 -25.7617    6.9  19.3  164.0   1.0526   1.7    7.8	GRS 1758-258                  
274.0481 -13.9668    2.0   7.1  155.8   3.5108   5.9    4.8	GX 17+2                       
275.9349 -30.3983    2.0  23.5  148.9   3.9615   5.7    1.9	H1820-303                     
285.0735 -25.0430    4.9  20.7  124.1   1.6315   2.4    7.6	HT1900.1-2455                 
288.8005  10.9150    0.7  22.8   10.6  10.6563  16.8    1.8	GRS 1915+105                  
299.6038  35.2093    0.5  48.3   -0.4  30.9714  21.3    0.8	Cyg X-1                       
308.1861  40.8927    5.7  56.9    2.0   6.9500   2.0    5.0	Cyg X-3                       
263.0567 -33.8652    3.0  29.0  171.9   2.7452   3.8    3.8	GX 354-0                      
256.7876 -59.5807    3.6  54.4  162.9  12.7591   3.3 ------	UNKNOWN                       
283.9119  10.2563    2.3  19.5    0.6   2.6705   5.0 ------	UNKNOWN                       
272.9157  -3.5246    2.9   3.8  -53.6   2.4449   3.9 ------	UNKNOWN                       
249.7170   1.6954    5.5  26.2  -99.8   1.8932   2.1 ------	UNKNOWN                       
221.9855 -38.0670    2.6  56.7 -159.6  13.6448   4.5 ------	UNKNOWN                       
	UNKNOWN