batgrbproduct analysis for trigger=272773

batgrbproduct Analysis for Trigger=272773

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 11:02:14 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger272773
======================================================================

  Trigger: 00272773      Segment: 000

  BAT Trigger Time: 196746835.008   [s; MET]
      Trigger Stop: 196746836.032   [s; MET]
               UTC: 2007-03-28T03:53:53.155520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 65.1167749451009   Dec: -34.0690105976273  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    16.55
     Image Trigger?:     NO
     Rate S/N Ratio:     75.5645419492502  [ if not an image trigger ]
     Image S/N Ratio:    16.55

  Flight Position:   [ source = BAT ]
    RA: 65.1167749451009   Dec: -34.0690105976273  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 65.1156752078046   Dec: -34.0764757488784  [deg; J2000]  
        { 04h 20m 27.8s , -34d 04' 35.3" }
         +/- 0.64247440303593 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.228990516345009 [arcmin] (formal 1-sigma fit error)
    SNR: 57.2281954992137
 
  Angular difference between Flight and Ground position is 0.451232 arcmin
 
  Partial Coding Fraction: 0.609375    [ including projection effects ]

  Duration
     T90: 72.1160000264645 +/- 8.4830277610073
        Measured from: -3.80799999833107
                   to: 68.3080000281334     [s; relative to TRIGTIME]
     T50: 17.9679999947548 +/- 0.765631784157104
        Measured from: 3.80400002002716
                   to: 21.772000014782     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.784000009298325     
                   to: 1.78400000929832     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -17.9679999947548     
                   to: 123.092000007629     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.650506   4.463461   4.401652   1.566906
           0.064556   0.069126   0.063031   0.052093 [error]
 Peak      0.100188   0.168375   0.188215   0.083044
           0.007786   0.009170   0.009104   0.007645 [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 8.84e-07 1.94e-06 3.34e-06 1.34e-05 9.15e-06 1.95e-05   erg/cm2
              Error 3.88e-08 4.98e-08 6.76e-08 6.53e-07 1.76e-07 6.68e-07   erg/cm2
Peak flux Power-law 9.94e-01 1.29e+00 1.23e+00 2.07e+00 4.21e+00 5.59e+00   ph/cm2/s
              Error 1.11e-01 8.69e-02 7.22e-02 2.66e-01 2.34e-01 3.21e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.58e-07 1.94e-06 3.38e-06 1.20e-05 9.12e-06 1.81e-05   erg/cm2
              Error 5.36e-08 5.06e-08 8.44e-08 1.39e-06 1.83e-07 1.38e-06   erg/cm2
Peak flux Cutoff-PL 9.71e-01 1.30e+00 1.24e+00 1.89e+00 4.19e+00 5.40e+00   ph/cm2/s
              Error 1.37e-01 9.14e-02 8.64e-02 4.69e-01 2.41e-01 4.37e-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    1.213    0.036    -      -           6.42e-03 1.27e-04   36.780 57
CPL   1.116    0.106     565.9    0.0      7.03e-03 6.98e-04   35.430 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.071    0.095    -      -           3.64e-02 1.96e-03   54.380 57
CPL   0.981    0.254     632.0    0.0      3.99e-02 1.33e-02   54.200 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: 54.144000 sec.
T50 in the 50-300 keV band: 16.704000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  141.060  -17.968  123.092
T90    72.116   -3.808   68.308
T50    17.968    3.804   21.772
Peak    1.000    0.784    1.784

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
   65.1157   -34.0765   0.0034    39.5857  -167.8965         6.0581134     57.228 TRIG_00272773                 
 
Foreground time interval of the image:
-17.968  11.493 (delta_t =  29.461 [sec])
Background time interval of the image:
-74.707 -17.968 (delta_t =  56.739 [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  -17.968 sec. to  123.092 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.21295     ( -0.036152   0.0359883 )
Norm@50keV  : 6.41683E-03    ( -0.000127179   0.000126811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.78 using 59 PHA bins.
# Reduced chi-squared =         0.6452 for     57 degrees of freedom 
# Null hypothesis probability =   9.828108e-01
 
Photon flux (15-150 keV)    in 141.1 sec: 0.754606 ( -0.0165747  0.0166268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.15255e-06 ( -1.75638e-07  1.75692e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -17.968 sec. to  123.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.11607     ( -0.145965   0.0663512 )
Epeak [keV] : 565.880      ( -565.881 -565.881 )
Norm@50keV  : 7.02525E-03    ( -0.00039759   0.000998337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.43 using 59 PHA bins.
# Reduced chi-squared =         0.6327 for     56 degrees of freedom 
# Null hypothesis probability =   9.855720e-01
 
Photon flux (15-150 keV)    in 141.1 sec: 0.749078 ( -0.018232  0.01785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.12313e-06 ( -1.83105e-07  1.8264e-07 ) ergs/cm2

Band function

Time interval is from  -17.968 sec. to  123.092 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.793319   ( 0.793319   5.75266 )
beta        : -1.24290    ( 1.2429   0.0524504 )
Epeak [keV] : 112.782      ( -112.782 832.194 )
Norm@50keV   : 1.10347E-02    ( -0.00464121   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          34.82 using 59 PHA bins.
# Reduced chi-squared =         0.6331 for     55 degrees of freedom 
# Null hypothesis probability =   9.846762e-01
 
Photon flux (15-150 keV)    in 141.1 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]    : 21.9871  (  )
R^2/D10^2   : 2.47872E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         528.49 using 59 PHA bins.
# Reduced chi-squared =         9.2718 for     57 degrees of freedom 
# Null hypothesis probability =   1.360740e-77
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.130e-07   1.411e-08
25- 50  1.655e-06   5.150e-08
50-150  5.976e-06   1.679e-07
15-150  7.943e-06   1.700e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 3.31015       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         357.15 using 59 PHA bins.
# Reduced chi-squared =         6.2658 for     57 degrees of freedom 
# Null hypothesis probability =   4.837514e-45
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.163e-06   2.434e-08
25- 50  2.237e-06   4.868e-08
50-150  4.907e-06   1.086e-07
15-150  8.307e-06   1.820e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.55146        (-0.678135      0.728891)
R1^2/D10^2  : 0.325941        (-0.0754006      0.103997)
kT2 [keV]   : 34.7763        (-2.41466      3.02801)
R2^2/D10^2  : 4.75421E-03    (-0.00113154   0.00128944)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.13 using 59 PHA bins.
# Reduced chi-squared =         0.6932 for     55 degrees of freedom 
# Null hypothesis probability =   9.595726e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.516e-07   5.799e-08
25- 50  1.999e-06   8.254e-08
50-150  6.386e-06   2.526e-07
15-150  9.137e-06   3.139e-07

Peak spectrum fit

Power-law model

Time interval is from    0.784 sec. to    1.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.07145     ( -0.0958464   0.0947168 )
Norm@50keV  : 3.63593E-02    ( -0.00195912   0.00195488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.38 using 59 PHA bins.
# Reduced chi-squared =         0.9541 for     57 degrees of freedom 
# Null hypothesis probability =   5.738446e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.20654 ( -0.233413  0.233785 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.8368e-07 ( -2.22827e-08  2.23463e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.784 sec. to    1.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.980685     ( -0.374125   0.133861 )
Epeak [keV] : 631.970      ( -654.71 -654.71 )
Norm@50keV  : 3.99319E-02    ( -0.00856082   0.0180524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.20 using 59 PHA bins.
# Reduced chi-squared =         0.9679 for     56 degrees of freedom 
# Null hypothesis probability =   5.432095e-01
 
Photon flux (15-150 keV)    in 1 sec: 4.19106 ( -0.24066  0.24073 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.82396e-07 ( -2.3225e-08  2.3076e-08 ) ergs/cm2

Band function

Time interval is from    0.784 sec. to    1.784 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5   -5 )
beta        : -1.10597    ( -0.103053   0.101261 )
Epeak [keV] : 25.2427      ( -25.2426 4.19725 )
Norm@50keV   : 2470.42    ( -131.36   6.64276e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.11 using 59 PHA bins.
# Reduced chi-squared =         0.9474 for     55 degrees of freedom 
# Null hypothesis probability =   5.858958e-01
 
Photon flux (15-150 keV)    in 1 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]    : 21.3000  (  )
R^2/D10^2   : 0.162697  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         121.27 using 59 PHA bins.
# Reduced chi-squared =         2.1275 for     57 degrees of freedom 
# Null hypothesis probability =   1.534945e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.386e-08   1.545e-09
25- 50  7.187e-08   6.320e-09
50-150  2.433e-07   2.025e-08
15-150  3.290e-07   2.230e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 17.3821       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         125.56 using 59 PHA bins.
# Reduced chi-squared =         2.2028 for     57 degrees of freedom 
# Null hypothesis probability =   4.550510e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.328e-08   2.490e-09
25- 50  8.326e-08   5.640e-09
50-150  1.826e-07   3.605e-08
15-150  3.091e-07   3.985e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.68372        (-2.17128      2.57471)
R1^2/D10^2  : 1.64160        (-0.84833      2.46107)
kT2 [keV]   : 37.2386        (-7.65616      17.5411)
R2^2/D10^2  : 2.41011E-02    (-0.0161265   0.0262767)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.49 using 59 PHA bins.
# Reduced chi-squared =          1.027 for     55 degrees of freedom 
# Null hypothesis probability =   4.192260e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.817e-08   6.485e-09
25- 50  7.772e-08   1.340e-08
50-150  2.803e-07   6.930e-08
15-150  3.862e-07   8.025e-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: 1.15566     ( -0.0427089   0.0424588 )
Norm@50keV  : 1.42553E-02    ( -0.000338211   0.000337552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.53 using 59 PHA bins.
# Reduced chi-squared =         0.8865 for     57 degrees of freedom 
# Null hypothesis probability =   7.147242e-01
 
Photon flux (15-150 keV)    in 29.46 sec: 1.66358 ( -0.0426566  0.0427769 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.31592e-06 ( -1.01094e-07  1.01148e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00367     ( -0.173006   0.0857348 )
Epeak [keV] : 400.842      ( -179.001 -400.846 )
Norm@50keV  : 1.64789E-02    ( -0.00170456   0.00286484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.12 using 59 PHA bins.
# Reduced chi-squared =         0.8593 for     56 degrees of freedom 
# Null hypothesis probability =   7.638202e-01
 
Photon flux (15-150 keV)    in 29.46 sec: 1.64735 ( -0.04581  0.04599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.29388e-06 ( -1.05231e-07  1.04848e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.483915   ( -0.505263   4.48062 )
beta        : -1.20840    ( -0.0832974   0.0636179 )
Epeak [keV] : 88.2929      ( -51.2057 202.603 )
Norm@50keV   : 3.41149E-02    ( -0.0173746   0.437181 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.56 using 59 PHA bins.
# Reduced chi-squared =         0.8466 for     55 degrees of freedom 
# Null hypothesis probability =   7.839205e-01
 
Photon flux (15-150 keV)    in 29.46 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)  = 1.94e-06
S(50-100 keV) = 3.34e-06

T90 vs. Hardness ratio plot

T90                                   = 72.1160000264645 sec.
Hardness ratio (energy fluence ratio) = 1.72165

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.684
Count Ratio (50-100 keV) / (15-25 keV) = 1.66068

Mask shadow pattern

IMX = -8.084711976861790E-01, IMY = 1.733730157792924E-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:
-74.707410 -17.968000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6517  22.0112    0.4  22.3   48.4   2.4446  29.8    1.0	Crab                          
 84.0429  45.2019    2.0  42.1   24.6   0.7470   5.7 ------	UNKNOWN                       
 24.2144  21.1234    2.6  45.5  -57.5   1.3701   4.5 ------	UNKNOWN

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

Time interval of the image:
-17.968000 11.492600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.7718  22.0285    6.6  22.4   48.6  -0.1437  -1.8    7.8	Crab                          
 65.1157 -34.0765    0.2  39.6 -167.9   6.0580  57.2 ------	UNKNOWN                       
 65.9519 -53.0133    2.7  58.4 -170.3   1.9787   4.3 ------	UNKNOWN                       
 30.8764  -8.8687    3.1  39.9 -102.7   0.9695   3.8 ------	UNKNOWN                       
 28.8703  -6.4421    2.6  41.1  -98.2   1.3406   4.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
77.092600 963.097200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
104.9740 -29.0881    3.5  34.1   71.6   2.5292   3.3 ------	UNKNOWN                       
 77.4519 -14.3094    2.9  22.7   11.2   1.3208   4.0 ------	UNKNOWN                       
 65.1854 -34.0914    2.1   0.1  112.6   2.0803   5.5 ------	UNKNOWN                       
 42.0219   7.8286    3.9  47.2  -53.2   6.2769   3.0 ------	UNKNOWN

Plot creation:
Sun May 31 10:41:04 EDT 2015