batgrbproduct analysis for trigger=283320

batgrbproduct Analysis for Trigger=283320

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 (local time): Mon Jan 20 08:47:19 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger283320
======================================================================

  Trigger: 00283320      Segment: 000

  BAT Trigger Time: 204734464.896   [s; MET]
      Trigger Stop: 204734465.92   [s; MET]
               UTC: 2007-06-28T14:41:02.843960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 115.283792218838   Dec: -20.2846481551998  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.08
     Image Trigger?:     NO
     Rate S/N Ratio:     24.3721152139079  [ if not an image trigger ]
     Image S/N Ratio:    12.08

  Flight Position:   [ source = BAT ]
    RA: 115.283792218838   Dec: -20.2846481551998  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 115.271587247302   Dec: -20.2801849570132  [deg; J2000]  
        { 07h 41m 05.2s , -20d 16' 48.7" }
         +/- 1.22185885560025 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.311826738501272 [arcmin] (formal 1-sigma fit error)
    SNR: 22.8456020462954
 
  Angular difference between Flight and Ground position is 0.737247 arcmin
 
  Partial Coding Fraction: 0.5859375    [ including projection effects ]

  Duration
     T90: 39.080000013113 +/- 4.07110598949185
        Measured from: -26.1159999966621
                   to: 12.9640000164509     [s; relative to TRIGTIME]
     T50: 6.15200001001358 +/- 0.592283710686162
        Measured from: 1.71200001239777
                   to: 7.86400002241135     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 4.88800001144409     
                   to: 5.88800001144409     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -31.7360000014305     
                   to: 16.1879999935627     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.001426   2.252915   1.511788   0.040672
           0.059250   0.068902   0.065652   0.074380 [error]
 Peak      0.164791   0.226039   0.147421   0.020496
           0.010493   0.012438   0.011402   0.011811 [error]

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

======================================================================
 
=== 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   Power-law 7.11e-07 1.03e-06 1.12e-06 2.26e-06 3.56e-06 5.13e-06   erg/cm2
              Error 4.72e-08 4.01e-08 6.88e-08 2.98e-07 1.54e-07 3.53e-07   erg/cm2
Peak flux Power-law 1.88e+00 1.67e+00 1.03e+00 9.54e-01 4.98e+00 5.53e+00   ph/cm2/s
              Error 1.97e-01 1.11e-01 9.83e-02 1.81e-01 3.28e-01 3.67e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.97e-07 1.05e-06 1.12e-06 1.85e-06 3.52e-06 4.72e-06   erg/cm2
              Error 4.27e-08 4.72e-08 7.01e-08 5.71e-07 1.83e-07 5.41e-07   erg/cm2
Peak flux Cutoff-PL 1.80e+00 1.73e+00 1.04e+00 6.18e-01 4.91e+00 5.19e+00   ph/cm2/s
              Error 2.25e-01 1.39e-01 1.04e-01 2.58e-01 3.41e-01 5.15e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 1.70e+00 1.81e+00 9.98e-01 7.92e-01 4.87e+00 5.32e+00   ph/cm2/s
              Error 2.52e-01 -------- 1.05e-01 -------- -------- 4.08e-01   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.886    0.079    -      -           8.08e-03 3.51e-04   58.760 57
CPL   1.766    0.289      92.5    0.0      9.33e-03 0.00e+00   58.250 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.706    0.119    -      -           3.74e-02 2.72e-03   63.460 57
CPL   1.375    0.448      86.6  -28.9      5.66e-02 3.44e-02   61.880 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 11.712000 sec.
T50 in the 50-300 keV band: 4.608000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   47.924  -31.736   16.188
T90    39.080  -26.116   12.964
T50     6.152    1.712    7.864
Peak    1.000    4.888    5.888

Click here for the BAT GCN circular template

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
  115.2716   -20.2802   0.0084    38.1961   -20.3154         6.1653130     22.846 TRIG_00283320                 
 
Foreground time interval of the image:
-31.736  16.188 (delta_t =  47.924 [sec])
Background time interval of the image:
-120.995 -31.736 (delta_t =  89.259 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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  -31.736 sec. to   16.188 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.88558     ( -0.0783511   0.0795395 )
Norm@50keV  : 8.08435E-03    ( -0.000352067   0.000349383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.76 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     57 degrees of freedom 
# Null hypothesis probability =   4.108939e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.15315 ( -0.0463837  0.0465526 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.56138e-06 ( -1.53691e-07  1.54658e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -31.736 sec. to   16.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76577     ( -0.301422   0.27596 )
Epeak [keV] : 92.4664      (   )
Norm@50keV  : 9.32910E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.25 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     56 degrees of freedom 
# Null hypothesis probability =   3.927057e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.14289 ( -0.05183  0.05189 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.51978e-06 ( -1.83543e-07  1.81765e-07 ) ergs/cm2

Band function

Time interval is from  -31.736 sec. to   16.188 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.76571   ( -0.284436   0.224807 )
beta        : -10.0000    ( 10   1.77636e-15 )
Epeak [keV] : 92.4245      ( -37.3058 -92.4245 )
Norm@50keV   : 9.32758E-03    ( -0.00155843   0.00392021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.25 using 59 PHA bins.
# Reduced chi-squared =          1.059 for     55 degrees of freedom 
# Null hypothesis probability =   3.568627e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.14290 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.0323  (  )
R^2/D10^2   : 0.253092  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         230.43 using 59 PHA bins.
# Reduced chi-squared =         4.0427 for     57 degrees of freedom 
# Null hypothesis probability =   1.027766e-22
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.715e-07   2.832e-08
25- 50  1.173e-06   5.080e-08
50-150  1.023e-06   9.991e-08
15-150  2.567e-06   1.090e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 92.3667       (-13.0877      16.8076)
Norm        : 5.06301       (-0.309204     0.340187)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.59 using 59 PHA bins.
# Reduced chi-squared =          1.133 for     57 degrees of freedom 
# Null hypothesis probability =   2.286942e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.335e-07   4.576e-08
25- 50  1.077e-06   4.720e-08
50-150  1.667e-06   4.500e-07
15-150  3.378e-06   4.598e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.59683        (-0.572575      0.622468)
R1^2/D10^2  : 3.32341        (-1.14375      1.89289)
kT2 [keV]   : 21.4403        (-2.17631      2.72679)
R2^2/D10^2  : 2.33804E-02    (-0.00845374   0.0118737)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.64 using 59 PHA bins.
# Reduced chi-squared =         0.9025 for     55 degrees of freedom 
# Null hypothesis probability =   6.789316e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.921e-07   8.674e-08
25- 50  1.011e-06   8.697e-08
50-150  1.757e-06   2.262e-07
15-150  3.460e-06   3.398e-07

Peak spectrum fit

Power-law model

Time interval is from    4.888 sec. to    5.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.70630     ( -0.117795   0.120328 )
Norm@50keV  : 3.74401E-02    ( -0.00273936   0.00271022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.46 using 59 PHA bins.
# Reduced chi-squared =          1.113 for     57 degrees of freedom 
# Null hypothesis probability =   2.592563e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.98346 ( -0.327515  0.327667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.46483e-07 ( -2.66083e-08  2.68827e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    4.888 sec. to    5.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.37497     ( -0.498777   0.396701 )
Epeak [keV] : 86.6245      ( -28.7862 -86.6245 )
Norm@50keV  : 5.65792E-02    ( -0.0208581   0.0478474 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.88 using 59 PHA bins.
# Reduced chi-squared =          1.105 for     56 degrees of freedom 
# Null hypothesis probability =   2.741830e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.90994 ( -0.34167  0.3411 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35623e-07 ( -3.0485e-08  3.0616e-08 ) ergs/cm2

Band function

Time interval is from    4.888 sec. to    5.888 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.39114   ( -0.302177   0.465215 )
beta        : -9.37078    ( 9.37156   19.3716 )
Epeak [keV] : 89.7337      ( -27.4716 -89.7303 )
Norm@50keV   : 5.52689E-02    ( -0.0183661   0.0330739 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.89 using 59 PHA bins.
# Reduced chi-squared =          1.125 for     55 degrees of freedom 
# Null hypothesis probability =   2.437038e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.86734 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.35507e-07 ( -3.355e-07  -2.8066e-08 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.9599  (  )
R^2/D10^2   : 1.21388  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         114.84 using 59 PHA bins.
# Reduced chi-squared =         2.0147 for     57 degrees of freedom 
# Null hypothesis probability =   8.906358e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.671e-08   4.085e-09
25- 50  1.151e-07   8.600e-09
50-150  9.876e-08   1.612e-08
15-150  2.506e-07   2.020e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 128.082       (-33.4844      49.5851)
Norm        : 20.8808       (-1.63701     2.01846)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.95 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     57 degrees of freedom 
# Null hypothesis probability =   3.040493e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.422e-08   4.995e-09
25- 50  9.808e-08   1.003e-08
50-150  1.806e-07   6.346e-08
15-150  3.329e-07   7.230e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.88927        (-1.02786      1.12287)
R1^2/D10^2  : 6.42649        (-2.56666      4.85866)
kT2 [keV]   : 25.8710        (-5.11178      8.57682)
R2^2/D10^2  : 5.41190E-02    (-0.033773   0.0680771)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.72 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     55 degrees of freedom 
# Null hypothesis probability =   4.107500e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.436e-08   1.258e-08
25- 50  9.961e-08   2.261e-08
50-150  1.859e-07   9.269e-08
15-150  3.399e-07   1.071e-07

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.88558     ( -0.0783511   0.0795395 )
Norm@50keV  : 8.08435E-03    ( -0.000352067   0.000349383 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.76 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     57 degrees of freedom 
# Null hypothesis probability =   4.108939e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.15315 ( -0.0463837  0.0465526 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.56138e-06 ( -1.53691e-07  1.54658e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.76577     ( -0.301422   0.27596 )
Epeak [keV] : 92.4664      (   )
Norm@50keV  : 9.32910E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.25 using 59 PHA bins.
# Reduced chi-squared =          1.040 for     56 degrees of freedom 
# Null hypothesis probability =   3.927057e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.14289 ( -0.05183  0.05189 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.51978e-06 ( -1.83543e-07  1.81765e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.76571   ( -0.284436   0.224807 )
beta        : -10.0000    ( 10   1.38556e-13 )
Epeak [keV] : 92.4245      ( -37.3058 -92.4245 )
Norm@50keV   : 9.32758E-03    ( -0.00155843   0.00392021 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.25 using 59 PHA bins.
# Reduced chi-squared =          1.059 for     55 degrees of freedom 
# Null hypothesis probability =   3.568627e-01
 
Photon flux (15-150 keV)    in 47.92 sec: 1.14290 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.03e-06
S(50-100 keV) = 1.12e-06

T90 vs. Hardness ratio plot

T90                                   = 39.080000013113 sec.
Hardness ratio (energy fluence ratio) = 1.08738

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.12565
Count Ratio (50-100 keV) / (15-25 keV) = 0.755355

Mask shadow pattern

IMX = 7.378699333075571E-01, IMY = 2.731714232833398E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-120.995400 -31.736000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4455 -40.4787    7.6  55.3    8.0  -1.1563  -1.5    5.9	Vela X-1                      
 66.0313 -22.3114    2.8   8.2  134.1   0.5272   4.2 ------	UNKNOWN                       
123.6269  -1.2856    2.9  51.5  -43.0   2.5698   4.0 ------	UNKNOWN                       
108.6753   7.7730    3.5  43.6  -64.2   1.9943   3.3 ------	UNKNOWN

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

Time interval of the image:
-31.736000 16.188000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5135 -40.4683   76.3  55.4    8.0   0.1799   0.1    5.2	Vela X-1                      
 23.7938 -17.9155    2.3  47.8  145.6   4.1633   5.1 ------	UNKNOWN                       
115.2716 -20.2802    0.5  38.2  -20.3   6.1656  22.8 ------	UNKNOWN                       
 31.2854  21.2869    3.1  59.1 -166.1   4.1947   3.8 ------	UNKNOWN                       
117.0003  -0.4954    3.2  45.9  -47.9   1.9165   3.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Sun May 31 09:50:51 EDT 2015