GRB081017

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 21:36:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger331964
======================================================================

  Trigger: 00331964      Segment: 000

  BAT Trigger Time: 245979496   [s; MET]
      Trigger Stop: 245979816   [s; MET]
               UTC: 2008-10-17T23:38:12.816960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 230.179956090345   Dec: -32.815165184944  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    8.34
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.34

  Analysis Position:   [ source = BAT ]
    RA: 230.179956090345   Dec: -32.815165184944  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 230.220914430587   Dec: -32.7839166418828  [deg; J2000]  
        { 15h 20m 53.0s , -32d 47' 02.1" }
         +/- 2.31295734090389 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.418653260676 [arcmin] (formal 1-sigma fit error)
    SNR: 9.18076600983296
 
  Angular difference between the analysis and refined position is 2.789700 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]
     T50: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100     N/A      N/A      N/A 
T90      N/A      N/A      N/A 
T50      N/A      N/A      N/A 
Peak     N/A      N/A      N/A 
 
 
====== 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      -1.627    -0.238      0.234       -           -               -         4.80e-04     -6.54e-05          6.43e-05      40.910   57
CPL     -1.514    -0.352      0.842      201.712    -201.712      -201.712      5.51e-04     -1.36e-04          9.39e-04      40.950   56
 
 
=== 1-s peak 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      N/A         N/A       N/A          -           -               -           N/A           N/A               N/A         N/A        N/A   
CPL     N/A         N/A       N/A          N/A         N/A           N/A           N/A           N/A               N/A         N/A        N/A   
 
 
=== 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   2.20e-07  3.74e-07  4.84e-07  1.27e-06  1.43e-06  2.34e-06   erg/cm2
      90%_error_low -4.50e-08 -4.78e-08 -8.92e-08 -4.33e-07 -2.07e-07 -5.18e-07   erg/cm2
      90%_error_hi   4.71e-08  4.75e-08  8.94e-08  5.72e-07  2.11e-07  6.32e-07   erg/cm2
Peak flux       PL     N/A      N/A      N/A      N/A      N/A      N/A     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
  230.2209   -32.7839   0.0210    22.1224   -50.3668         2.3946705      9.181 TRIG_00331964                 
 
Foreground time interval of the image:
  0.000 135.424 (delta_t = 135.424 [sec])
137.000 320.000 (delta_t = 183.000 [sec])
Background time interval of the image:

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

Multiple GTIs in the spectrum
tstart tstop
0.000000 135.424500
137.000000 320.000000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62725     ( -0.238161   0.233976 )
Norm@50keV  : 4.80027E-04    ( -6.54499e-05   6.43279e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.91 using 59 PHA bins.
# Reduced chi-squared =         0.7176 for     57 degrees of freedom 
# Null hypothesis probability =   9.467851e-01
 
Photon flux (15-150 keV)    in 318.4 sec: 6.22200E-02 ( -0.0078881  0.0079046 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42509e-06 ( -2.06935e-07  2.11058e-07 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
0.000000 135.424500
137.000000 320.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62549     ( -0.344061   0.850315 )
Epeak [keV] : 9912.74      ( -9896.49 -9896.49 )
Norm@50keV  : 4.81099E-04    ( -6.58883e-05   0.00100877 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.90 using 59 PHA bins.
# Reduced chi-squared =         0.7304 for     56 degrees of freedom 
# Null hypothesis probability =   9.350942e-01
 
Photon flux (15-150 keV)    in 318.4 sec: 6.21905E-02 ( -0.0080956  0.0078907 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.42391e-06 ( -2.42086e-07  2.0983e-07 ) ergs/cm2

1-s peak spectrum fit

1-s peak spectrum unavailable, likely because there are no event data in the 1-s peak range.

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 = 2.593034808704709E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image:

Pre-slew

 Time interval of the image: 0.000000 135.424500 137.000000 320.000000

# RAcent #  [deg] 170.2005 -60.4988 186.4921 -62.9282 244.9782 -15.6396 255.9819 -37.8453 256.5379 -36.4328 262.9671 -24.6901 264.8444 -44.6007 270.3428 -25.1333 270.3419 -25.7472 273.9935 -14.0341 275.8880 -30.3619 284.9840 -24.8789 263.0314 -33.8069 336.5473 -77.8667 288.1010 -40.2132 266.5762 -32.2531 263.2537 -45.2892 257.5276 -48.0809 230.2209 -32.7839 215.5795 -33.4441

Post-slew

 Time interval of the image: 452.500630 963.101600

# RAcent #  [deg] 170.2494 -60.6840 186.4222 -62.9396 244.9686 -15.6452 255.9965 -37.8645 256.5165 -36.5179 263.0494 -24.6850 264.7622 -44.4355 268.2492  -1.6039 270.2584 -25.0840 270.3126 -25.7843 273.9945 -14.0165 275.9455 -30.3110 285.1616 -24.8258 262.9533 -33.8024 296.9727 -70.5795 266.5703 -32.1985 255.1519 -41.6693 150.3102 -72.5379 186.9835 -58.2486 220.8136 -40.4414 213.7570 -45.2666

IMY = 3.130741359772135E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 9.9 35.3 -161.5 0.3716 1.2 8.2 Cen X-3 12.1 27.2 -162.6 0.2524 1.0 10.5 GX 301-2 0.2 39.0 -22.3 15.8179 47.3 0.1 Sco X-1 0.7 20.6 11.2 3.7343 16.4 0.2 4U 1700-377 3.8 22.1 10.3 0.7493 3.0 5.0 GX 349+2 4.7 35.0 9.0 0.7876 2.4 4.0 GX 1+4 8.4 19.9 38.7 0.3675 1.4 10.0 4U 1735-44 2.4 37.8 19.3 1.8962 4.8 4.6 GX 5-1 4.7 37.3 19.8 0.9494 2.5 2.1 GRS 1758-258 915.9 49.2 15.9 -0.0082 -0.0 0.7 GX 17+2 4.0 36.3 31.0 1.1113 2.9 1.9 H1820-303 5.0 45.5 35.7 1.7865 2.3 3.8 HT1900.1-2455 3.3 27.1 17.8 0.9175 3.5 2.7 GX 354-0 2.7 39.2 127.3 2.9531 4.2 ------ UNKNOWN 3.0 36.1 54.8 2.0755 3.9 ------ UNKNOWN 1.5 30.0 21.2 2.2293 7.5 ------ UNKNOWN 2.5 18.6 38.3 1.2144 4.7 ------ UNKNOWN 2.7 13.8 38.1 0.9596 4.3 ------ UNKNOWN 1.3 22.1 -50.4 2.3949 9.2 ------ UNKNOWN 4.6 26.0 -79.3 0.8721 2.5 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 15.4 49.8 -139.7 1.0703 0.8 4.1 Cen X-3 11.3 42.7 -134.7 -0.6611 -1.0 12.0 GX 301-2 0.7 49.3 -43.5 19.7997 16.0 0.7 Sco X-1 1.0 25.1 -45.9 3.7212 11.5 1.3 4U 1700-377 3.6 26.0 -43.5 1.0540 3.2 6.9 GX 349+2 4.8 34.9 -24.3 0.8904 2.4 4.2 GX 1+4 13.0 16.1 -39.4 0.2607 0.9 1.2 4U 1735-44 0.0 56.6 -10.9 -1.3846 -1.2 11.5 SW J1753.5-0127 2.0 33.1 -13.0 2.1888 5.9 1.4 GX 5-1 4.6 32.4 -13.2 0.9058 2.5 2.5 GRS 1758-258 4.8 43.6 -5.2 1.4103 2.4 1.4 GX 17+2 5.1 27.2 -4.4 0.7703 2.3 3.5 H1820-303 3.5 32.8 12.0 1.1587 3.3 8.9 HT1900.1-2455 1.6 26.3 -30.1 2.1150 7.1 2.6 GX 354-0 3.1 15.0 161.1 1.0310 3.7 ------ UNKNOWN 1.2 26.8 -22.5 3.2954 9.8 ------ UNKNOWN 1.8 22.3 -52.5 2.0510 6.6 ------ UNKNOWN 3.0 45.5 -157.9 2.4291 3.8 ------ UNKNOWN 3.1 45.4 -129.3 4.2996 3.7 ------ UNKNOWN 3.4 40.8 -88.6 5.3390 3.4 ------ UNKNOWN 4.4 41.3 -99.3 4.9061 2.6 ------ 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

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

Pre-burst Time interval of the image:

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

Pre-burst
Time interval of the image: