batgrbproduct analysis for trigger=316534

batgrbproduct Analysis for Trigger=316534

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 00:27:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger316534
======================================================================

  Trigger: 00316534      Segment: 000

  BAT Trigger Time: 237366793.728   [s; MET]
      Trigger Stop: 237366797.824   [s; MET]
               UTC: 2008-07-10T07:13:10.798420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 8.25709402209318   Dec: 19.4919117249144  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.57
     Image Trigger?:     NO
     Rate S/N Ratio:     12  [ if not an image trigger ]
     Image S/N Ratio:    8.57

  Flight Position:   [ source = BAT ]
    RA: 8.25709402209318   Dec: 19.4919117249144  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 8.25764258624305   Dec: 19.4700647446021  [deg; J2000]  
        { 00h 33m 01.8s , +19d 28' 12.2" }
         +/- 2.30833434785602 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.43177465483584 [arcmin] (formal 1-sigma fit error)
    SNR: 9.20704397153118
 
  Angular difference between Flight and Ground position is 1.311186 arcmin
 
  Partial Coding Fraction: 0.484375    [ including projection effects ]

  Duration
     T90: 142.988000005484 +/- 25.1402219599534
        Measured from: -90.619999974966
                   to: 52.3680000305176     [s; relative to TRIGTIME]
     T50: 70.4720000326633 +/- 14.7374149738363
        Measured from: -58.6319999992847
                   to: 11.8400000333786     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.888000011444092     
                   to: 1.88800001144409     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -96.2159999907017     
                   to: 66.5480000078678     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.674046   0.830969   0.688983   0.215894
           0.092054   0.097569   0.091387   0.092521 [error]
 Peak      0.036816   0.047055   0.027189   0.007897
           0.007625   0.008238   0.007636   0.007564 [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 1.94e-07 3.68e-07 5.40e-07 1.69e-06 1.53e-06 2.79e-06   erg/cm2
              Error 4.07e-08 4.57e-08 9.15e-08 6.36e-07 2.19e-07 7.05e-07   erg/cm2
Peak flux Power-law 3.77e-01 3.10e-01 1.73e-01 1.42e-01 9.22e-01 1.00e+00   ph/cm2/s
              Error 1.06e-01 6.45e-02 5.83e-02 9.09e-02 1.91e-01 2.17e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.94e-07 3.68e-07 5.36e-07 1.67e-06 1.52e-06 2.65e-06   erg/cm2
              Error 4.09e-08 3.95e-08 8.99e-08 6.83e-07 2.18e-07 9.16e-07   erg/cm2
Peak flux Cutoff-PL 3.54e-01 3.63e-01 1.48e-01 2.03e-02 8.84e-01 8.86e-01   ph/cm2/s
              Error 1.14e-01 1.05e-01 1.13e-01 -------- 1.95e-01 2.19e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.448    0.228    -      -           9.80e-04 1.22e-04   62.610 57
CPL   2.231    0.000      83.3    0.0      3.57e-04 0.00e+00   60.950 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.843    0.369    -      -           6.58e-03 1.71e-03   67.710 57
CPL   0.495    3.573      41.5    0.0      4.55e-02 0.00e+00   65.930 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: 123.520000 sec.
T50 in the 50-300 keV band: 79.296000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  162.764  -96.216   66.548
T90   142.988  -90.620   52.368
T50    70.472  -58.632   11.840
Peak    1.000    0.888    1.888

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
    8.2576    19.4701   0.0210    25.6600    85.0457         2.4665149      9.207 TRIG_00316534                 
 
Foreground time interval of the image:
-96.216  66.548 (delta_t = 162.764 [sec])
Background time interval of the image:
-239.728 -96.216 (delta_t = 143.512 [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 4.096000

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 4.096000

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 4.096000

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  -96.216 sec. to   66.548 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.44785     ( -0.226238   0.229321 )
Norm@50keV  : 9.80042E-04    ( -0.00012326   0.000121684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.61 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     57 degrees of freedom 
# Null hypothesis probability =   2.841058e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120712 ( -0.014492  0.0145149 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52739e-06 ( -2.16558e-07  2.20596e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -96.216 sec. to   66.548 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.23058     (     )
Epeak [keV] : 83.3215      (   )
Norm@50keV  : 3.56757E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.95 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     56 degrees of freedom 
# Null hypothesis probability =   3.024972e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120803 ( -0.014644  0.014399 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51742e-06 ( -2.08166e-07  2.27927e-07 ) ergs/cm2

Band function

Time interval is from  -96.216 sec. to   66.548 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26645   ( 1.26645   1.26645 )
beta        : -1.44784    ( 1.44784   0.226217 )
Epeak [keV] : 27.4135      ( -27.4135 -27.4135 )
Norm@50keV   : 1.68823E-03    ( -0.000825322   357.972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.61 using 59 PHA bins.
# Reduced chi-squared =          1.138 for     55 degrees of freedom 
# Null hypothesis probability =   2.244995e-01
 
Photon flux (15-150 keV)    in 162.8 sec:  (    ) 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]    : 14.5471  (-2.27628  2.91691)
R^2/D10^2   : 1.48053E-02  (-0.00690008   0.0120094)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          83.52 using 59 PHA bins.
# Reduced chi-squared =          1.465 for     57 degrees of freedom 
# Null hypothesis probability =   1.259089e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.073e-07   2.729e-08
25- 50  4.142e-07   8.026e-08
50-150  5.881e-07   1.483e-07
15-150  1.110e-06   1.970e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 0.491506       (-0.0586801     0.0586781)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.29 using 59 PHA bins.
# Reduced chi-squared =          1.128 for     57 degrees of freedom 
# Null hypothesis probability =   2.366348e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.993e-07   1.119e-07
25- 50  3.833e-07   2.096e-07
50-150  8.407e-07   4.667e-07
15-150  1.423e-06   7.911e-07

Double BB

R1^2/D10^2  : 6.05362E-02        (-1.70464      50.1027)
kT2 [keV]   : 50.2345        (      )
R2^2/D10^2  : 2.26318E-04    (   )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.87 using 59 PHA bins.
#Fit statistic : Chi-Squared =          65.81 using 59 PHA bins.
#Fit statistic : Chi-Squared =          65.76 using 59 PHA bins.
# Reduced chi-squared =          1.216 for     55 degrees of freedom 
# Reduced chi-squared =          1.196 for     55 degrees of freedom 
# Reduced chi-squared =          1.196 for     55 degrees of freedom 
# Null hypothesis probability =   1.308965e-01
# Null hypothesis probability =   1.509870e-01
# Null hypothesis probability =   1.518257e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.070e-07   9.786e-08
25- 50  3.230e-07   1.017e-07
50-150  8.413e-07   3.477e-07
15-150  1.371e-06   3.956e-07

Peak spectrum fit

Power-law model

Time interval is from    0.888 sec. to    1.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.84278     ( -0.353935   0.384311 )
Norm@50keV  : 6.57776E-03    ( -0.00173463   0.00168482 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.71 using 59 PHA bins.
# Reduced chi-squared =          1.188 for     57 degrees of freedom 
# Null hypothesis probability =   1.567148e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.921874 ( -0.191257  0.191312 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.04915e-08 ( -1.54555e-08  1.63332e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.888 sec. to    1.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.494990     ( -5.50053   1.64474 )
Epeak [keV] : 41.4807      (   )
Norm@50keV  : 4.55311E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.93 using 59 PHA bins.
# Reduced chi-squared =          1.177 for     56 degrees of freedom 
# Null hypothesis probability =   1.711287e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.883848 ( -0.194558  0.196372 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.05801e-08 ( -1.704e-08  2.03296e-08 ) ergs/cm2

Band function

Time interval is from    0.888 sec. to    1.888 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.554883   ( -1.62396   1.88807 )
beta        : -10.00000    ( 10   5.92681e-09 )
Epeak [keV] : 42.0090      ( -13.5101 -42.009 )
Norm@50keV   : 4.14901E-02    ( -0.00847929   108.716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.93 using 59 PHA bins.
# Reduced chi-squared =          1.199 for     55 degrees of freedom 
# Null hypothesis probability =   1.485339e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.4068e-08 ( -5.4061e-08  -1.68592e-08 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 8.96579  (-1.69641  2.35014)
R^2/D10^2   : 0.682442  (-0.40491   0.841861)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.02 using 59 PHA bins.
# Reduced chi-squared =          1.176 for     57 degrees of freedom 
# Null hypothesis probability =   1.709866e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.066e-08   4.156e-09
25- 50  2.252e-08   8.015e-09
50-150  8.492e-09   5.024e-09
15-150  4.167e-08   1.484e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 74.9598       (-35.5153      123.026)
Norm        : 4.47668       (-1.14327     1.71286)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.39 using 59 PHA bins.
# Reduced chi-squared =          1.165 for     57 degrees of freedom 
# Null hypothesis probability =   1.847620e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.156e-08   3.462e-09
25- 50  1.873e-08   6.856e-09
50-150  2.527e-08   2.123e-08
15-150  5.556e-08   2.857e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.26079        (-2.33446      1.95063)
R1^2/D10^2  : 1.23925        (-0.788683      2.80424)
kT2 [keV]   : 26.4913        (-26.4399      -26.4913)
R2^2/D10^2  : 6.35669E-03    (-0.00634417   0.254025)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.70 using 59 PHA bins.
# Reduced chi-squared =          1.158 for     55 degrees of freedom 
# Null hypothesis probability =   1.970444e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.163e-08   6.885e-09
25- 50  2.037e-08   1.228e-08
50-150  2.559e-08   1.499e-08
15-150  5.759e-08   2.950e-08

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: 1.44785     ( -0.226238   0.229321 )
Norm@50keV  : 9.80042E-04    ( -0.00012326   0.000121684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.61 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     57 degrees of freedom 
# Null hypothesis probability =   2.841058e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120712 ( -0.014492  0.0145149 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.52739e-06 ( -2.16558e-07  2.20596e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.23058     (     )
Epeak [keV] : 83.3215      (   )
Norm@50keV  : 3.56757E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.95 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     56 degrees of freedom 
# Null hypothesis probability =   3.024972e-01
 
Photon flux (15-150 keV)    in 162.8 sec: 0.120803 ( -0.014644  0.014399 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51742e-06 ( -2.08166e-07  2.27927e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.26645   ( 1.26645   1.26645 )
beta        : -1.44784    ( 1.44784   0.226217 )
Epeak [keV] : 27.4135      ( -27.4135 -27.4135 )
Norm@50keV   : 1.68823E-03    ( -0.000825322   188.602 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.61 using 59 PHA bins.
# Reduced chi-squared =          1.138 for     55 degrees of freedom 
# Null hypothesis probability =   2.244995e-01
 
Photon flux (15-150 keV)    in 162.8 sec:  (    ) 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)  = 3.68e-07
S(50-100 keV) = 5.40e-07

T90 vs. Hardness ratio plot

T90                                   = 142.988000005484 sec.
Hardness ratio (energy fluence ratio) = 1.46739

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.23281
Count Ratio (50-100 keV) / (15-25 keV) = 1.02216

Mask shadow pattern

IMX = 4.148834867826598E-02, IMY = -4.786129414824871E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-239.728000 -96.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
316.7616  82.0426    3.2  55.3 -168.3   1.6493   3.7 ------	UNKNOWN                       
326.5259  83.5243    2.7  54.5 -166.2   1.8543   4.2 ------	UNKNOWN                       
284.5800  83.5486    2.9  59.1 -166.1   3.5918   3.9 ------	UNKNOWN

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

Time interval of the image:
-96.216000 66.548000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  8.2576  19.4701    1.3  25.7   85.0   2.4642   9.2 ------	UNKNOWN                       
105.8565  81.1773    2.4  54.8 -148.6   3.9830   4.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
289.772600 962.281600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6480 -40.4694    4.5  54.6 -165.6  -3.3917  -2.6    7.5	Vela X-1                      
181.8044 -35.9041    3.1  49.6  148.5   6.2771   3.7 ------	UNKNOWN                       
156.1128 -22.5913    2.8  32.1  178.6   1.6248   4.1 ------	UNKNOWN                       
133.4573   7.1635    2.6  26.5 -100.8   2.1513   4.4 ------	UNKNOWN

Plot creation:
Sun May 31 07:02:58 EDT 2015