batgrbproduct analysis for trigger=635148

batgrbproduct Analysis for Trigger=635148

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 Apr  6 02:57:28 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger635148
======================================================================

  Trigger: 00635148      Segment: 000

  BAT Trigger Time: 448258975.296   [s; MET]
      Trigger Stop: 448258975.808   [s; MET]
               UTC: 2015-03-17T04:22:41.976060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 138.935547486144   Dec: 55.4522389164227  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.73
     Image Trigger?:     NO
     Rate S/N Ratio:     13.0384048104053  [ if not an image trigger ]
     Image S/N Ratio:    8.73

  Flight Position:   [ source = BAT ]
    RA: 138.935547486144   Dec: 55.4522389164227  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 138.99883136461   Dec: 55.4749826921804  [deg; J2000]  
        { 09h 15m 59.7s , +55d 28' 29.9" }
         +/- 1.76902617525697 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.713630398286199 [arcmin] (formal 1-sigma fit error)
    SNR: 13.4651841051028
 
  Angular difference between Flight and Ground position is 2.548746 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 23.283999979496 +/- 0.850129364648628
        Measured from: -0.0360000133514404
                   to: 23.2479999661446     [s; relative to TRIGTIME]
     T50: 17.1959999799728 +/- 3.14955489580404
        Measured from: 1.83999997377396
                   to: 19.0359999537468     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.148000001907349     
                   to: 0.851999998092651     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.435999989509583     
                   to: 23.9919999837875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.321439   0.379847   0.286047   0.078942
           0.029921   0.030994   0.026701   0.022166 [error]
 Peak      0.032898   0.053054   0.055835   0.006020
           0.006458   0.007104   0.006313   0.004985 [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 8.77e-08 1.61e-07 2.27e-07 6.70e-07 6.48e-07 1.14e-06   erg/cm2
              Error 1.30e-08 1.41e-08 2.67e-08 1.73e-07 6.34e-08 1.93e-07   erg/cm2
Peak flux Power-law 3.09e-01 3.71e-01 3.23e-01 4.81e-01 1.17e+00 1.48e+00   ph/cm2/s
              Error 7.52e-02 5.61e-02 5.00e-02 1.67e-01 1.58e-01 2.10e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.81e-08 1.61e-07 2.25e-07 6.61e-07 6.44e-07 1.09e-06   erg/cm2
              Error 1.26e-08 1.39e-08 2.66e-08 1.75e-07 6.28e-08 2.53e-07   erg/cm2
Peak flux Cutoff-PL 2.72e-01 3.88e-01 3.43e-01 2.71e-01 1.15e+00 1.27e+00   ph/cm2/s
              Error 8.99e-02 6.37e-02 5.94e-02 2.63e-01 1.62e-01 2.87e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 2.84e-01 3.83e-01 3.38e-01 2.94e-01 1.16e+00 1.33e+00   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    1.505    0.158    -      -           2.80e-03 2.45e-04   50.800 57
CPL   2.057    0.000      22.3    0.0      1.44e-03 0.00e+00   49.800 56
 
The chi2 of BB fit is -------- which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.201    0.224    -      -           9.98e-03 1.32e-03   65.020 57
CPL   0.623    0.828     128.6  -38.6      1.88e-02 2.11e-02   63.520 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: 751.040000 sec.
T50 in the 50-300 keV band: 751.040000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   24.428   -0.436   23.992
T90    23.284   -0.036   23.248
T50    17.196    1.840   19.036
Peak    1.000   -0.148    0.852

Click here for the BAT GCN circular template

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  138.9988    55.4750   0.0143    17.2199    66.4855         0.5456560     13.465 TRIG_00635148                 
 
Foreground time interval of the image:
 -0.436  10.405 (delta_t =  10.841 [sec])
Background time interval of the image:
-239.296  -0.436 (delta_t = 238.860 [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

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

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   -0.436 sec. to   23.992 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50516     ( -0.157476   0.158691 )
Norm@50keV  : 2.79983E-03    ( -0.000246057   0.000244136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.80 using 59 PHA bins.
# Reduced chi-squared =         0.8912 for     57 degrees of freedom 
# Null hypothesis probability =   7.054922e-01
 
Photon flux (15-150 keV)    in 24.43 sec: 0.350015 ( -0.0299734  0.0300339 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.48328e-07 ( -6.30746e-08  6.37051e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.436 sec. to   23.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.05712     (     )
Epeak [keV] : 22.2980      (   )
Norm@50keV  : 1.43608E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.80 using 59 PHA bins.
# Reduced chi-squared =         0.8893 for     56 degrees of freedom 
# Null hypothesis probability =   7.072190e-01
 
Photon flux (15-150 keV)    in 24.43 sec: 0.350468 ( -0.030373  0.029561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.44251e-07 ( -5.9404e-08  6.62371e-08 ) ergs/cm2

Band function

Time interval is from   -0.436 sec. to   23.992 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.24795   ( 1.24795   1.24795 )
beta        : -1.50515    ( -0.158788   0.157484 )
Epeak [keV] : 23.1309      ( -23.1316 -23.1316 )
Norm@50keV   : 5.81812E-03    ( -0.00250383   0.407951 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.80 using 59 PHA bins.
# Reduced chi-squared =         0.9236 for     55 degrees of freedom 
# Null hypothesis probability =   6.357980e-01
 
Photon flux (15-150 keV)    in 24.43 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]    : 14.5766  (-1.85518  2.21107)
R^2/D10^2   : 4.19541E-02  (-0.0161867   0.0258311)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         102.52 using 59 PHA bins.
# Reduced chi-squared =         1.7985 for     57 degrees of freedom 
# Null hypothesis probability =   2.064329e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.579e-08   7.488e-09
25- 50  1.771e-07   2.000e-08
50-150  2.528e-07   4.711e-08
15-150  4.757e-07   5.277e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 1.41999       (-0.119976     0.119976)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.67 using 59 PHA bins.
# Reduced chi-squared =         0.9416 for     57 degrees of freedom 
# Null hypothesis probability =   6.008196e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.665e-08   1.064e-08
25- 50  1.667e-07   3.614e-08
50-150  3.655e-07   1.685e-07
15-150  6.189e-07   1.923e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.77917        (-1.46449      1.7282)
R1^2/D10^2  : 0.463620        (-0.249509      0.666536)
kT2 [keV]   : 33.3210        (-8.88116      21.9527)
R2^2/D10^2  : 2.14704E-03    (-0.00159941   0.00371811)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.67 using 59 PHA bins.
# Reduced chi-squared =         0.9212 for     55 degrees of freedom 
# Null hypothesis probability =   6.407961e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.931e-08   3.274e-08
25- 50  1.586e-07   4.201e-08
50-150  4.244e-07   2.074e-07
15-150  6.723e-07   2.516e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.148 sec. to    0.852 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20127     ( -0.224944   0.222145 )
Norm@50keV  : 9.97830E-03    ( -0.00132091   0.00132014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.02 using 59 PHA bins.
# Reduced chi-squared =          1.141 for     57 degrees of freedom 
# Null hypothesis probability =   2.177036e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.17146 ( -0.157616  0.157848 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.01197e-07 ( -1.49587e-08  1.5122e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.148 sec. to    0.852 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.622591     ( -0.973352   0.682058 )
Epeak [keV] : 128.586      ( -51.3142 -128.599 )
Norm@50keV  : 1.87736E-02    ( -0.00963962   0.0324696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.52 using 59 PHA bins.
# Reduced chi-squared =          1.134 for     56 degrees of freedom 
# Null hypothesis probability =   2.286201e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.14649 ( -0.161968  0.16175 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.8042e-08 ( -1.58337e-08  1.5888e-08 ) ergs/cm2

Band function

Time interval is from   -0.148 sec. to    0.852 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.620984   ( -0.497476   0.646965 )
beta        : -10.0000    ( 10   5.32907e-15 )
Epeak [keV] : 128.177      ( -50.8802 -128.177 )
Norm@50keV   : 1.88285E-02    ( -0.00965315   0.0324724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.52 using 59 PHA bins.
# Reduced chi-squared =          1.155 for     55 degrees of freedom 
# Null hypothesis probability =   2.013933e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.15757 (    ) 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]    : 19.4139  (-3.1973  3.91455)
R^2/D10^2   : 6.02364E-02  (-0.0270999   0.0484756)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.61 using 59 PHA bins.
# Reduced chi-squared =          1.274 for     57 degrees of freedom 
# Null hypothesis probability =   7.962509e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.427e-09   1.206e-09
25- 50  2.161e-08   4.860e-09
50-150  6.011e-08   1.458e-08
15-150  8.615e-08   1.984e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (      )
Norm        : 4.80759       (-0.647645     0.647604)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.62 using 59 PHA bins.
# Reduced chi-squared =          1.239 for     57 degrees of freedom 
# Null hypothesis probability =   1.060557e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.197e-08   6.870e-09
25- 50  2.303e-08   1.263e-08
50-150  5.051e-08   2.799e-08
15-150  8.550e-08   4.748e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.74229        (-2.21539      3.40566)
R1^2/D10^2  : 1.01351        (-0.753971      3.69583)
kT2 [keV]   : 27.0663        (-6.01884      12.085)
R2^2/D10^2  : 1.75338E-02    (-0.0124403   0.0253586)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.30 using 59 PHA bins.
# Reduced chi-squared =          1.115 for     55 degrees of freedom 
# Null hypothesis probability =   2.604120e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.243e-09   5.184e-09
25- 50  2.164e-08   1.125e-08
50-150  6.867e-08   3.847e-08
15-150  9.955e-08   5.170e-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: 1.38640     ( -0.202596   0.20306 )
Norm@50keV  : 3.20281E-03    ( -0.000369004   0.000367163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.22 using 59 PHA bins.
# Reduced chi-squared =          1.179 for     57 degrees of freedom 
# Null hypothesis probability =   1.668551e-01
 
Photon flux (15-150 keV)    in 10.84 sec: 0.388856 ( -0.0445548  0.0446192 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.36418e-07 ( -4.34758e-08  4.39822e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.32130     (     )
Epeak [keV] : 528.053      (   )
Norm@50keV  : 3.45396E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.26 using 59 PHA bins.
# Reduced chi-squared =          1.201 for     56 degrees of freedom 
# Null hypothesis probability =   1.441579e-01
 
Photon flux (15-150 keV)    in 10.84 sec: 0.388754 ( -0.045565  0.044531 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.36314e-07 ( -4.61882e-08  4.39226e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.91537   ( -4.91537   -4.91537 )
beta        : -1.41291    ( -0.22124   0.212696 )
Epeak [keV] : 20.7850      ( -20.785 7.57709 )
Norm@50keV   : 816.534    ( -91.8887   1.41682e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.09 using 59 PHA bins.
# Reduced chi-squared =          1.220 for     55 degrees of freedom 
# Null hypothesis probability =   1.271384e-01
 
Photon flux (15-150 keV)    in 10.84 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)  = 1.61e-07
S(50-100 keV) = 2.27e-07

T90 vs. Hardness ratio plot

T90                                   = 23.283999979496 sec.
Hardness ratio (energy fluence ratio) = 1.40994

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.18171
Count Ratio (50-100 keV) / (15-25 keV) = 0.889895

Mask shadow pattern

IMX = 1.236572072202750E-01, IMY = -2.841953609162477E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-239.296000 -0.436000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6283  22.0203    0.3  40.8 -166.9   9.9646  33.6    0.4	Crab                          
159.6704  70.7751    2.4  23.9   17.9   1.0172   4.8 ------	UNKNOWN                       
 39.2960  46.4139    2.4  41.2  -98.6   4.8698   4.7 ------	UNKNOWN

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

Time interval of the image:
-0.436000 10.404590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6425  21.8835    3.6  40.9 -167.0   0.1750   3.2    7.9	Crab                          
138.9988  55.4750    0.9  17.2   66.5   0.5456  13.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
49.004600 417.534900
418.704000 477.384000
478.704000 962.799800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6410  22.0095    0.7  52.5 -152.3  30.7545  16.4    0.5	Crab                          
229.2940  75.8780    3.0  37.1  -22.1   2.7448   3.9 ------	UNKNOWN                       
 71.3634  37.0921    2.1  48.0 -129.0  12.8816   5.5 ------	UNKNOWN

Plot creation:
Thu May 28 13:08:19 EDT 2015