GRB080919

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 22:25:49 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger325268
======================================================================

  Trigger: 00325268      Segment: 000

  BAT Trigger Time: 243475516.16   [s; MET]
      Trigger Stop: 243475516.672   [s; MET]
               UTC: 2008-09-19T00:05:13.051580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 265.288933640242   Dec: -42.3961038809504  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.57
     Image Trigger?:     NO
     Rate S/N Ratio:     26  [ if not an image trigger ]
     Image S/N Ratio:    6.57

  Analysis Position:   [ source = BAT ]
    RA: 265.288933640242   Dec: -42.3961038809504  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 265.227296792695   Dec: -42.3700466440115  [deg; J2000]  
        { 17h 40m 54.6s , -42d 22' 12.2" }
         +/- 1.91305287867778 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.921355200917208 [arcmin] (formal 1-sigma fit error)
    SNR: 12.0406871816966
 
  Angular difference between the analysis and refined position is 3.147461 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 0.599999994039536 +/- 0.0840951674734262
        Measured from: 0.120000004768372
                   to: 0.719999998807907     [s; relative to TRIGTIME]
     T50: 0.328000009059906 +/- 0.0850411706287281
        Measured from: 0.236000001430511
                   to: 0.564000010490417     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0740000009536743     
                   to: 0.925999999046326     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0920000076293945     
                   to: 0.759999990463257     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.020270   0.034365   0.034188   0.017558
           0.004887   0.004805   0.004340   0.003786 [error]
 Peak      0.022026   0.038715   0.038705   0.018690
           0.005849   0.005682   0.005072   0.004433 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.668    0.092    0.760
T90     0.600    0.120    0.720
T50     0.328    0.236    0.564
Peak    1.000   -0.074    0.926
 
 
====== 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      -0.949    -0.259      0.276       -           -               -         9.86e-03     -1.42e-03          1.40e-03      51.820   57
CPL     -0.891    -0.319      0.683      991.890    -991.890      -991.890      1.05e-02     -2.05e-03          7.43e-04      51.990   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      -0.977     -0.268     0.286       -           -               -         7.33e-03     -1.11e-03          1.10e-03      62.100   57
CPL     -0.974     -0.266     0.390     9999.360    -9999.360      -9999.360      7.37e-03     -1.10e-03          1.31e-02      62.110   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   5.03e-09  1.30e-08  2.69e-08  1.42e-07  7.25e-08  1.87e-07   erg/cm2
      90%_error_low -1.50e-09 -2.42e-09 -4.09e-09 -4.56e-08 -1.08e-08 -4.78e-08   erg/cm2
      90%_error_hi   1.67e-09  2.34e-09  4.03e-09  6.13e-08  1.08e-08  6.18e-08   erg/cm2
Peak flux       PL   1.83e-01  2.52e-01  2.56e-01  4.74e-01  8.43e-01  1.16e+00   ph/cm2/s
      90%_error_low -5.71e-02 -5.05e-02 -4.02e-02 -1.47e-01 -1.30e-01 -1.83e-01   ph/cm2/s
      90%_error_hi   6.42e-02  4.93e-02  3.97e-02  1.92e-01  1.31e-01  1.92e-01   ph/cm2/s
 
Fluence        CPL   5.27e-09  1.29e-08  2.64e-08  1.53e-07  7.34e-08  1.89e-07   erg/cm2
      90%_error_low -1.82e-09    N/A       N/A    -9.71e-08 -1.13e-08 -9.01e-08   erg/cm2
      90%_error_hi   1.11e-09    N/A       N/A     1.53e-08  9.85e-09  2.37e-08   erg/cm2
Peak flux      CPL   1.84e-01  2.52e-01  2.56e-01  4.70e-01  8.44e-01  1.17e+00   ph/cm2/s
      90%_error_low -4.00e-02 -4.50e-02 -3.99e-02     N/A   -1.34e-01 -3.43e-01   ph/cm2/s
      90%_error_hi   6.37e-02  5.22e-02  4.73e-02     N/A    1.30e-01  1.71e-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
  265.2273   -42.3700   0.0159    16.2770  -177.4286         0.1061385     12.041 TRIG_00325268                 
 
Foreground time interval of the image:
  0.092   0.760 (delta_t =   0.668 [sec])
Background time interval of the image:
-179.459   0.092 (delta_t = 179.551 [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    0.092 sec. to    0.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.949078     ( -0.258528   0.276205 )
Norm@50keV  : 9.85758E-03    ( -0.00142475   0.00140456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.82 using 59 PHA bins.
# Reduced chi-squared =         0.9092 for     57 degrees of freedom 
# Null hypothesis probability =   6.690865e-01
 
Photon flux (15-150 keV)    in 0.668 sec: 1.13250 ( -0.164528  0.16542 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.25415e-08 ( -1.0756e-08  1.08375e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.092 sec. to    0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.943281     ( -0.319036   0.683274 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 9.91883E-03    ( -0.00142942   0.00136223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.84 using 59 PHA bins.
# Reduced chi-squared =         0.9257 for     56 degrees of freedom 
# Null hypothesis probability =   6.330940e-01
 
Photon flux (15-150 keV)    in 0.668 sec: 1.13221 ( -0.164506  0.1654 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.33831e-08 ( -1.12767e-08  9.84812e-09 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.074 sec. to    0.926 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.976523     ( -0.267605   0.285715 )
Norm@50keV  : 7.32970E-03    ( -0.00111484   0.0011018 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.10 using 59 PHA bins.
# Reduced chi-squared =          1.090 for     57 degrees of freedom 
# Null hypothesis probability =   2.993229e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.842919 ( -0.129698  0.13053 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.99374e-08 ( -1.25219e-08  1.26261e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.074 sec. to    0.926 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.974026     ( -0.267244   0.389172 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 7.37474E-03    ( -0.00109988   0.0131449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.11 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     56 degrees of freedom 
# Null hypothesis probability =   2.677410e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.843730 ( -0.133661  0.130101 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.00111e-08 ( -1.33841e-08  1.25716e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 0.6 sec.
Hardness ratio (energy fluence ratio) = 2.07190587539

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

S(15-50 keV)  = 1.8015824e-08
S(50-150 keV) = 5.452615e-08

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 = -2.916905386315400E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -179.459360 0.092000

# RAcent #  [deg] 244.9810 -15.6443 255.9589 -37.8532 256.4227 -36.4014 263.0269 -24.8792 264.8915 -44.3623 268.3386  -1.4492 270.3634 -24.9501 270.2174 -25.7299 273.9860 -14.0325 275.8713 -30.3842 285.0554 -24.9528 288.8198  10.9484 262.9640 -33.8378 289.4577  19.7286 289.7864  12.5629 242.2216 -66.0501 261.1584  -2.0146 255.7088  -7.0780 213.5665 -57.0339

Pre-slew

 Time interval of the image: 0.092000 0.760000

# RAcent #  [deg] 245.0260 -15.5095 255.7870 -37.8825 256.4236 -36.4101 263.1674 -24.7975 264.7710 -44.4580 268.3101  -1.3228 270.3458 -25.2134 270.4211 -25.7700 273.9920 -14.1474 275.9620 -30.2194 285.2036 -25.0153 288.7585  11.0006 263.1824 -33.7674 303.8371   6.8229 303.4407   7.8431 265.2274 -42.3700 259.0569  31.8920

Post-slew

 Time interval of the image: 54.940590 962.917000

# RAcent #  [deg] 186.6436 -62.7940 244.9722 -15.6448 255.9857 -37.8097 256.4183 -36.3978 262.9594 -24.8405 264.6716 -44.4331 268.3789  -1.4114 270.2887 -25.0821 270.3026 -25.7430 273.9798 -14.0518 275.8922 -30.4354 285.1685 -25.0502 262.9698 -33.8383 338.5211 -61.6803 283.5952 -16.9947 243.6341 -84.1233 255.1519 -41.6742 213.0649 -34.2178

IMY = 1.309972520275702E-02 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] ['] 0.3 24.4 -75.0 9.4795 43.5 0.3 Sco X-1 8.2 15.7 -146.7 0.2137 1.4 1.4 4U 1700-377 2.5 14.4 -143.5 0.7202 4.6 1.4 GX 349+2 4.8 5.2 -81.3 0.3865 2.4 8.1 GX 1+4 202.5 18.3 -177.9 -0.0096 -0.1 8.3 4U 1735-44 1.6 24.9 -6.7 1.2274 7.1 1.8 SW J1753.5-0127 4.4 2.1 44.0 0.4158 2.6 8.9 GX 5-1 3.2 1.6 62.4 0.5813 3.6 4.7 GRS 1758-258 1.4 13.3 17.3 1.2730 8.2 1.2 GX 17+2 2.0 7.6 117.7 0.9069 5.9 3.0 H1820-303 5.6 14.9 82.1 0.3693 2.1 2.2 HT1900.1-2455 2.2 42.2 24.2 1.6670 5.3 1.3 GRS 1915+105 1.8 8.9 -154.8 0.9735 6.3 1.3 GX 354-0 2.8 50.3 19.6 2.0486 4.1 ------ UNKNOWN 2.9 44.0 24.3 1.3329 3.9 ------ UNKNOWN 2.7 43.0 -170.9 1.0489 4.3 ------ UNKNOWN 2.2 25.3 -23.7 0.8334 5.3 ------ UNKNOWN 2.5 22.8 -40.9 0.8007 4.7 ------ UNKNOWN 2.6 49.3 -150.2 1.9053 4.4 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 5.0 24.4 -74.7 -0.0279 -2.3 8.3 Sco X-1 7.3 15.8 -146.4 0.0130 1.6 9.7 4U 1700-377 9.3 14.4 -143.5 0.0105 1.2 1.0 GX 349+2 14.5 5.1 -80.0 0.0069 0.8 9.2 GX 1+4 211.9 18.4 -177.6 -0.0005 -0.1 1.3 4U 1735-44 2.6 25.0 -6.8 0.0442 4.5 8.5 SW J1753.5-0127 12.3 2.0 49.6 0.0086 1.0 8.7 GX 5-1 17.2 1.8 65.9 -0.0070 -0.8 6.6 GRS 1758-258 4.7 13.2 17.5 -0.0219 -2.4 6.7 GX 17+2 8.2 7.6 116.3 -0.0126 -1.4 9.1 H1820-303 6.8 15.1 82.5 0.0165 1.7 10.7 HT1900.1-2455 36.5 42.2 24.1 -0.0059 -0.3 4.1 GRS 1915+105 6.2 8.8 -155.5 -0.0159 -1.9 10.4 GX 354-0 2.4 47.6 44.7 0.2055 4.8 ------ UNKNOWN 2.2 48.1 43.3 0.2283 5.2 ------ UNKNOWN 1.0 16.3 -177.4 0.1061 11.9 ------ UNKNOWN 2.8 58.9 -15.6 0.2362 4.1 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 2.5 48.2 -144.9 6.7446 4.6 1.5 GX 301-2 0.2 31.9 -41.0 50.0373 68.4 0.5 Sco X-1 3.3 8.5 -62.1 2.0162 3.5 2.1 4U 1700-377 1.6 9.1 -53.6 4.2751 7.1 1.7 GX 349+2 3.7 17.6 -8.8 1.7816 3.1 6.3 GX 1+4 7.9 2.1 -169.7 0.9111 1.5 3.2 4U 1735-44 2.6 41.1 2.9 3.9357 4.4 2.6 SW J1753.5-0127 123.0 17.8 13.2 0.0532 0.1 0.3 GX 5-1 4.0 17.1 13.7 1.6767 2.9 0.0 GRS 1758-258 1.3 29.3 15.6 5.8316 8.8 1.8 GX 17+2 3.5 14.7 37.0 1.9612 3.3 4.4 H1820-303 14.8 23.8 47.9 0.5698 0.8 10.6 HT1900.1-2455 1.6 8.7 -14.6 4.0819 7.2 1.0 GX 354-0 3.3 46.0 139.1 8.4053 3.5 ------ UNKNOWN 2.7 29.8 35.4 2.8790 4.3 ------ UNKNOWN 3.1 42.2 -178.6 3.4042 3.7 ------ UNKNOWN 1.6 7.6 -89.8 3.8511 7.2 ------ UNKNOWN 3.2 41.1 -98.2 13.1254 3.6 ------ 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