GRB080804

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: Sun Jan 19 23:32:23 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger319016
======================================================================

  Trigger: 00319016      Segment: 000

  BAT Trigger Time: 239584817.664   [s; MET]
      Trigger Stop: 239584818.688   [s; MET]
               UTC: 2008-08-04T23:20:14.670000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 328.700699569253   Dec: -53.1947513223728  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.49
     Image Trigger?:     NO
     Rate S/N Ratio:     12.8840987267251  [ if not an image trigger ]
     Image S/N Ratio:    7.49

  Analysis Position:   [ source = BAT ]
    RA: 328.700699569253   Dec: -53.1947513223728  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 328.673059820948   Dec: -53.1894744732047  [deg; J2000]  
        { 21h 54m 41.5s , -53d 11' 22.1" }
         +/- 1.15810163702579 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.372542331838535 [arcmin] (formal 1-sigma fit error)
    SNR: 24.6633292495005
 
  Angular difference between the analysis and refined position is 1.042819 arcmin
 
  Partial Coding Fraction: 0.1972656    [ including projection effects ]

  Duration
     T90: 37.8720000088215 +/- 42.3550184846043
        Measured from: 0.780000001192093
                   to: 38.6520000100136     [s; relative to TRIGTIME]
     T50: 11.4040000140667 +/- 2.24436807837188
        Measured from: 4.16799998283386
                   to: 15.5719999969006     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.60400000214577     
                   to: 2.60400000214577     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.351999998092651     
                   to: 112.856000006199     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.965022   1.498148   1.894939   0.633596
           0.096247   0.095805   0.084934   0.072120 [error]
 Peak      0.062872   0.129847   0.111745   0.049366
           0.016184   0.016230   0.015997   0.012335 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  113.208   -0.352  112.856
T90    37.872    0.780   38.652
T50    11.404    4.168   15.572
Peak    1.000    1.604    2.604
 
 
====== 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      -1.087    -0.102      0.104       -           -               -         3.19e-03     -1.86e-04          1.84e-04      47.860   57
CPL     -1.000    -0.131      0.363      719.173    -719.173      -719.173      3.46e-03     -4.29e-04          1.30e-03      47.880   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      -1.310     -0.238     0.240       -           -               -         2.56e-02     -3.53e-03          3.53e-03      44.630   57
CPL     -1.017     -0.516     1.091      183.654    -183.654      -183.654      3.52e-02     -3.52e-02          7.62e-02      44.340   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   3.14e-07  7.43e-07  1.40e-06  6.38e-06  3.79e-06  8.84e-06   erg/cm2
      90%_error_low -3.90e-08 -5.60e-08 -8.10e-08 -8.43e-07 -2.12e-07 -8.70e-07   erg/cm2
      90%_error_hi   4.11e-08  5.57e-08  8.07e-08  9.34e-07  2.13e-07  9.46e-07   erg/cm2
Peak flux       PL   8.80e-01  9.91e-01  7.99e-01  1.07e+00  3.06e+00  3.74e+00   ph/cm2/s
      90%_error_low -2.24e-01 -1.63e-01 -1.27e-01 -3.20e-01 -4.44e-01 -5.22e-01   ph/cm2/s
      90%_error_hi   2.45e-01  1.60e-01  1.25e-01  3.93e-01  4.47e-01  5.26e-01   ph/cm2/s
 
Fluence        CPL   3.17e-07  7.44e-07  1.40e-06  6.48e-06  3.79e-06  8.41e-06   erg/cm2
      90%_error_low -7.01e-08 -5.67e-08 -8.32e-08 -2.68e-06 -2.04e-07 -2.00e-06   erg/cm2
      90%_error_hi   3.16e-08  5.67e-08  1.07e-07  5.07e-07  2.10e-07  9.21e-07   erg/cm2
Peak flux      CPL   8.23e-01  1.01e+00  8.27e-01  7.95e-01  3.03e+00  3.46e+00   ph/cm2/s
      90%_error_low -2.76e-01 -1.74e-01 -1.47e-01 -4.79e-01 -4.59e-01 -7.05e-01   ph/cm2/s
      90%_error_hi   2.86e-01  1.82e-01  1.56e-01  3.84e-01  4.61e-01  7.60e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  328.6731   -53.1895   0.0078    45.8481   158.5852         3.1199011     24.663 TRIG_00319016                 
 
Foreground time interval of the image:
 -0.352  11.237 (delta_t =  11.589 [sec])
Background time interval of the image:
-239.664  -0.352 (delta_t = 239.312 [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

Bokeh Plot

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   -0.352 sec. to  112.856 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.08729     ( -0.102103   0.104098 )
Norm@50keV  : 3.19232E-03    ( -0.000185688   0.000184387 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.86 using 59 PHA bins.
# Reduced chi-squared =         0.8396 for     57 degrees of freedom 
# Null hypothesis probability =   8.005593e-01
 
Photon flux (15-150 keV)    in 113.2 sec: 0.369845 ( -0.022794  0.022923 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.79408e-06 ( -2.12319e-07  2.12617e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.352 sec. to  112.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0815     ( -0.127421   0.366997 )
Epeak [keV] : 9997.51      ( -9997.37 -9997.37 )
Norm@50keV  : 3.20962E-03    ( -0.000176142   0.00155649 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.85 using 59 PHA bins.
# Reduced chi-squared =         0.8545 for     56 degrees of freedom 
# Null hypothesis probability =   7.725379e-01
 
Photon flux (15-150 keV)    in 113.2 sec: 0.369259 ( -0.025247  0.021609 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.79242e-06 ( -2.043e-07  2.09948e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    1.604 sec. to    2.604 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31032     ( -0.238197   0.24034 )
Norm@50keV  : 2.56359E-02    ( -0.00352884   0.00352854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.63 using 59 PHA bins.
# Reduced chi-squared =         0.7830 for     57 degrees of freedom 
# Null hypothesis probability =   8.831824e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.06435 ( -0.44449  0.44675 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.52726e-07 ( -3.72792e-08  3.74891e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.604 sec. to    2.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.01664     ( -0.51614   1.09074 )
Epeak [keV] : 183.654      ( -183.712 -183.712 )
Norm@50keV  : 3.52074E-02    ( -0.0352026   0.0761767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.34 using 59 PHA bins.
# Reduced chi-squared =         0.7917 for     56 degrees of freedom 
# Null hypothesis probability =   8.697521e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.02688 ( -0.45891  0.461 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4919e-07 ( -4.01208e-08  3.91003e-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 = -9.589372706662448E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -239.664000 -0.352000

# RAcent #  [deg] 244.9825 -15.6379 255.9877 -37.8502 256.4674 -36.4365 263.1509 -24.6669 264.8966 -44.3221 268.2079  -1.3543 270.3559 -24.9439 270.3696 -25.8288 273.8139 -13.9863 275.9311 -30.3649 284.8983 -25.0040 263.0922 -33.8339 327.8765 -39.2014 286.1352   6.0921 208.4083 -71.9101

Pre-slew

 Time interval of the image: -0.352000 11.236600

# RAcent #  [deg] 244.9665 -15.4941 255.8885 -37.9116 256.4868 -36.2594 263.1052 -24.5537 264.7765 -44.5722 268.2634  -1.3337 270.3731 -24.8919 270.2400 -25.6997 273.8279 -14.0136 275.8171 -30.4198 285.1443 -24.9631 263.0263 -33.7143 328.6731 -53.1895 261.2148  -2.0594 326.9480 -71.7117 263.1379 -74.1530 233.6706  -5.1709 202.9689 -78.7294 222.4572 -26.7876

Post-slew

 Time interval of the image: 87.436600 962.426400

# RAcent #  [deg] 255.9610 -37.7252 256.4659 -36.3281 264.7484 -44.4770 270.2392 -25.8484 275.8514 -30.3308 285.1053 -24.9657 263.0130 -33.8607 341.0817 -47.3037 326.7799 -56.8035 238.8310 -44.4972 208.3047 -68.4781 48.1654 -43.5586

IMY = -3.760898952945209E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.4 28.7 -36.9 6.8397 30.7 0.2 Sco X-1 3.1 13.2 -95.1 0.7682 3.8 0.4 4U 1700-377 3.0 12.4 -89.6 0.7698 3.9 1.7 GX 349+2 16.2 10.1 -19.1 0.1246 0.7 9.1 GX 1+4 13.9 12.8 -137.3 0.1564 0.8 10.1 4U 1735-44 3.6 31.1 18.8 0.7112 3.2 11.3 SW J1753.5-0127 3.9 7.4 21.3 0.5463 3.0 9.0 GX 5-1 5.1 6.5 21.1 0.4239 2.3 6.3 GRS 1758-258 4.3 18.6 33.2 0.5135 2.7 11.6 GX 17+2 2.5 4.9 91.4 0.8789 4.5 0.3 H1820-303 8.1 14.4 86.8 -0.3080 -1.4 9.0 HT1900.1-2455 3.2 6.5 -81.7 0.7166 3.6 5.1 GX 354-0 2.9 46.1 139.1 3.0169 4.0 ------ UNKNOWN 2.4 41.1 47.4 2.5788 4.9 ------ UNKNOWN 3.7 50.9 -135.6 3.6196 3.1 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.3 28.8 -36.7 0.1244 2.7 8.8 Sco X-1 76.8 13.3 -95.3 0.0064 0.2 6.2 4U 1700-377 6.5 12.4 -88.8 -0.0778 -1.8 10.1 GX 349+2 284.4 10.2 -18.9 -0.0015 -0.0 12.7 GX 1+4 3.7 13.1 -137.4 0.1223 3.1 7.5 4U 1735-44 6.0 31.1 19.0 -0.0957 -1.9 9.5 SW J1753.5-0127 31.4 7.4 21.4 0.0147 0.4 12.2 GX 5-1 22.5 6.6 20.1 -0.0203 -0.5 4.3 GRS 1758-258 9.2 18.5 33.3 -0.0514 -1.3 10.4 GX 17+2 33.5 4.8 91.5 -0.0140 -0.3 6.4 H1820-303 4.5 14.6 87.2 0.1177 2.6 6.4 HT1900.1-2455 2.9 6.6 -80.6 0.1500 4.0 7.5 GX 354-0 0.5 45.8 158.6 3.1200 24.7 ------ UNKNOWN 2.1 31.6 5.3 0.2579 5.5 ------ UNKNOWN 2.0 49.1 -176.5 0.5411 5.8 ------ UNKNOWN 2.1 42.0 -153.3 0.3587 5.5 ------ UNKNOWN 2.4 43.9 -36.1 0.3533 4.7 ------ UNKNOWN 3.1 54.1 -143.4 0.7148 3.7 ------ UNKNOWN 2.1 42.0 -71.7 0.8105 5.5 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 4.5 50.9 8.0 3.2549 2.6 7.2 4U 1700-377 7.6 51.5 9.7 2.0893 1.5 5.9 GX 349+2 4.7 41.5 6.6 1.6141 2.5 1.6 4U 1735-44 4.2 50.9 29.9 5.4183 2.7 7.2 GRS 1758-258 2.9 44.2 30.8 4.1469 3.9 4.4 H1820-303 5.7 43.0 44.9 2.5225 2.0 4.6 HT1900.1-2455 3.1 49.4 16.8 4.1531 3.7 2.0 GX 354-0 3.5 9.9 169.6 1.2836 3.3 ------ UNKNOWN 2.7 3.8 -52.7 1.8842 4.4 ------ UNKNOWN 2.8 55.8 -9.1 6.7723 4.2 ------ UNKNOWN 4.8 50.7 -44.6 6.9363 2.4 ------ UNKNOWN 3.5 50.9 -135.4 10.0354 3.3 ------ UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright

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