batgrbproduct analysis for trigger=548927

batgrbproduct Analysis for Trigger=548927

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): Sun Jan 12 05:17:20 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger548927
======================================================================

  Trigger: 00548927      Segment: 000

  BAT Trigger Time: 382745734.848   [s; MET]
      Trigger Stop: 382745735.872   [s; MET]
               UTC: 2013-02-16T22:15:24.622820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 67.8981836700403   Dec: 14.6647956247236  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.84
     Image Trigger?:     NO
     Rate S/N Ratio:     59.9499791492875  [ if not an image trigger ]
     Image S/N Ratio:    20.84

  Flight Position:   [ source = BAT ]
    RA: 67.8981836700403   Dec: 14.6647956247236  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 67.9008255033316   Dec: 14.6693083113055  [deg; J2000]  
        { 04h 31m 36.2s , +14d 40' 09.5" }
         +/- 0.646348025878027 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.168300239262678 [arcmin] (formal 1-sigma fit error)
    SNR: 56.7388628594297
 
  Angular difference between Flight and Ground position is 0.311169 arcmin
 
  Partial Coding Fraction: 0.546875    [ including projection effects ]

  Duration
     T90: 6.51999998092651 +/- 1.08621174877495
        Measured from: -3.26800000667572
                   to: 3.25199997425079     [s; relative to TRIGTIME]
     T50: 3.69999998807907 +/- 0.173528101137716
        Measured from: -1.62000000476837
                   to: 2.0799999833107     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.10799998044968     
                   to: 2.10799998044968     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.1599999666214     
                   to: 4.30800002813339     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.960253   1.622676   1.430902   0.364151
           0.029589   0.033373   0.030951   0.023331 [error]
 Peak      0.129712   0.258201   0.311907   0.116323
           0.009716   0.011903   0.012467   0.009148 [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 3.48e-07 6.99e-07 1.10e-06 3.79e-06 3.05e-06 5.93e-06   erg/cm2
              Error 1.74e-08 2.08e-08 3.18e-08 2.48e-07 8.02e-08 2.65e-07   erg/cm2
Peak flux Power-law 1.38e+00 1.92e+00 1.99e+00 3.77e+00 6.48e+00 9.05e+00   ph/cm2/s
              Error 1.31e-01 1.13e-01 9.73e-02 3.97e-01 3.05e-01 4.61e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.03e-07 7.22e-07 1.15e-06 2.02e-06 2.97e-06 4.20e-06   erg/cm2
              Error 2.22e-08 2.30e-08 3.82e-08 4.17e-07 8.60e-08 4.17e-07   erg/cm2
Peak flux Cutoff-PL 1.24e+00 1.96e+00 2.09e+00 2.68e+00 6.40e+00 7.96e+00   ph/cm2/s
              Error 1.69e-01 1.20e-01 1.29e-01 8.07e-01 3.12e-01 8.54e-01   ph/cm2/s
 
Fluence        Band 3.00e-07 7.20e-07 1.15e-06 2.38e-06 2.96e-06 4.54e-06   erg/cm2
              Error 3.09e-08 -------- -------- -------- -------- --------   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    1.352    0.044    -      -           2.99e-02 7.48e-04   90.260 57
CPL   0.812    0.195     124.4   27.9      5.21e-02 1.03e-02   65.280 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.951    0.079    -      -           5.64e-02 2.63e-03   61.760 57
CPL   0.587    0.331     229.8  426.6      8.13e-02 2.68e-02   57.940 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: 6.016000 sec.
T50 in the 50-300 keV band: 2.688000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   10.468   -6.160    4.308
T90     6.520   -3.268    3.252
T50     3.700   -1.620    2.080
Peak    1.000    1.108    2.108

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
   67.9008    14.6693   0.0034    32.5947   -48.0889         4.5594392     56.739 TRIG_00548927                 
 
Foreground time interval of the image:
 -6.160   4.308 (delta_t =  10.468 [sec])
Background time interval of the image:
-168.347  -6.160 (delta_t = 162.187 [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   -6.160 sec. to    4.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.35226     ( -0.0445016   0.0444226 )
Norm@50keV  : 2.98586E-02    ( -0.000748457   0.000748359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          90.26 using 59 PHA bins.
# Reduced chi-squared =          1.584 for     57 degrees of freedom 
# Null hypothesis probability =   3.293068e-03
 
Photon flux (15-150 keV)    in 10.47 sec: 3.59878 ( -0.0982208  0.0984261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.05173e-06 ( -8.0131e-08  8.02074e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.160 sec. to    4.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.812013     ( -0.199335   0.191067 )
Epeak [keV] : 124.449      ( -19.0295 36.7099 )
Norm@50keV  : 5.21105E-02    ( -0.00909515   0.0115217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.28 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     56 degrees of freedom 
# Null hypothesis probability =   1.854768e-01
 
Photon flux (15-150 keV)    in 10.47 sec: 3.48394 ( -0.1046  0.10495 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97171e-06 ( -8.62833e-08  8.58121e-08 ) ergs/cm2

Band function

Time interval is from   -6.160 sec. to    4.308 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.721651   ( -0.276441   1.25499 )
beta        : -1.76189    ( 1.76199   0.29082 )
Epeak [keV] : 109.706      ( -54.283 49.4633 )
Norm@50keV   : 5.83371E-02    ( -0.0151194   0.301287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.16 using 59 PHA bins.
# Reduced chi-squared =          1.185 for     55 degrees of freedom 
# Null hypothesis probability =   1.641324e-01
 
Photon flux (15-150 keV)    in 10.47 sec: 3.47183 ( 3.52817  -0.12498 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.96445e-06 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 18.3045  (  )
R^2/D10^2   : 0.213163  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         293.16 using 59 PHA bins.
# Reduced chi-squared =         5.1432 for     57 degrees of freedom 
# Null hypothesis probability =   1.730419e-33
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.489e-07   7.853e-09
25- 50  6.972e-07   2.377e-08
50-150  1.703e-06   6.963e-08
15-150  2.549e-06   7.224e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 15.2136       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         142.64 using 59 PHA bins.
# Reduced chi-squared =         2.5025 for     57 degrees of freedom 
# Null hypothesis probability =   2.731038e-09
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.966e-07   1.105e-08
25- 50  7.630e-07   2.063e-08
50-150  1.673e-06   4.554e-08
15-150  2.833e-06   7.905e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.66365        (-0.955823      1.02859)
R1^2/D10^2  : 1.50018        (-0.413718      0.642018)
kT2 [keV]   : 29.2693        (-2.76321      3.84118)
R2^2/D10^2  : 3.38462E-02    (-0.0122557   0.0152867)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.70 using 59 PHA bins.
# Reduced chi-squared =          1.195 for     55 degrees of freedom 
# Null hypothesis probability =   1.529940e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.730e-07   2.481e-08
25- 50  7.440e-07   4.916e-08
50-150  1.950e-06   1.571e-07
15-150  2.967e-06   2.251e-07

Peak spectrum fit

Power-law model

Time interval is from    1.108 sec. to    2.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.950934     ( -0.0792066   0.0783464 )
Norm@50keV  : 5.64013E-02    ( -0.00262931   0.00262416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.76 using 59 PHA bins.
# Reduced chi-squared =          1.083 for     57 degrees of freedom 
# Null hypothesis probability =   3.100333e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.48014 ( -0.305285  0.305517 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.20852e-07 ( -3.07796e-08  3.08386e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.108 sec. to    2.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.587068     ( -0.343211   0.318576 )
Epeak [keV] : 229.803      ( -83.0571 770.124 )
Norm@50keV  : 8.12535E-02    ( -0.0216616   0.0320139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.94 using 59 PHA bins.
# Reduced chi-squared =          1.035 for     56 degrees of freedom 
# Null hypothesis probability =   4.037020e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.40452 ( -0.31205  0.31227 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.14079e-07 ( -3.2003e-08  3.1855e-08 ) ergs/cm2

Band function

Time interval is from    1.108 sec. to    2.108 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.792479   ( 0.792479   0.792479 )
beta        : -0.950938    ( -0.0783126   0.0792898 )
Epeak [keV] : 57.6558      (   )
Norm@50keV   : 8.91375E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.76 using 59 PHA bins.
# Reduced chi-squared =          1.123 for     55 degrees of freedom 
# Null hypothesis probability =   2.474345e-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]    : 23.0423  (  )
R^2/D10^2   : 0.206939  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         119.09 using 59 PHA bins.
# Reduced chi-squared =         2.0892 for     57 degrees of freedom 
# Null hypothesis probability =   2.810192e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.989e-08   1.845e-09
25- 50  1.081e-07   7.875e-09
50-150  4.285e-07   2.850e-08
15-150  5.564e-07   3.020e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 25.9968       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         214.28 using 59 PHA bins.
# Reduced chi-squared =         3.7593 for     57 degrees of freedom 
# Null hypothesis probability =   4.592684e-20
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.473e-08   3.185e-09
25- 50  1.245e-07   6.600e-09
50-150  2.731e-07   1.480e-08
15-150  4.624e-07   2.605e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.34673        (-2.25811      2.88217)
R1^2/D10^2  : 1.64404        (-0.799022      2.01989)
kT2 [keV]   : 35.6484        (-5.98044      14.0653)
R2^2/D10^2  : 4.53455E-02    (-0.0291284   0.0289326)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.80 using 59 PHA bins.
# Reduced chi-squared =          1.087 for     55 degrees of freedom 
# Null hypothesis probability =   3.056624e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.654e-08   9.040e-09
25- 50  1.172e-07   2.373e-08
50-150  4.635e-07   1.118e-07
15-150  6.172e-07   1.322e-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: 1.35226     ( -0.0445016   0.0444226 )
Norm@50keV  : 2.98586E-02    ( -0.000748457   0.000748359 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          90.26 using 59 PHA bins.
# Reduced chi-squared =          1.584 for     57 degrees of freedom 
# Null hypothesis probability =   3.293068e-03
 
Photon flux (15-150 keV)    in 10.47 sec: 3.59878 ( -0.0982208  0.0984261 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.05173e-06 ( -8.0131e-08  8.02074e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.812013     ( -0.199335   0.191067 )
Epeak [keV] : 124.449      ( -19.0295 36.7099 )
Norm@50keV  : 5.21105E-02    ( -0.00909515   0.0115217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.28 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     56 degrees of freedom 
# Null hypothesis probability =   1.854768e-01
 
Photon flux (15-150 keV)    in 10.47 sec: 3.48394 ( -0.1046  0.10495 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.97171e-06 ( -8.62833e-08  8.58121e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.721651   ( -0.276443   1.25498 )
beta        : -1.76189    ( 1.76199   0.29082 )
Epeak [keV] : 109.706      ( -54.283 49.4633 )
Norm@50keV   : 5.83371E-02    ( -0.0151194   0.301287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.16 using 59 PHA bins.
# Reduced chi-squared =          1.185 for     55 degrees of freedom 
# Null hypothesis probability =   1.641324e-01
 
Photon flux (15-150 keV)    in 10.47 sec: 3.47183 ( 3.52817  -0.12498 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.96445e-06 ( 0  0 ) ergs/cm2

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

S(25-50 keV)  = 6.99e-07
S(50-100 keV) = 1.10e-06

T90 vs. Hardness ratio plot

T90                                   = 6.51999998092651 sec.
Hardness ratio (energy fluence ratio) = 1.57368

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.68984
Count Ratio (50-100 keV) / (15-25 keV) = 1.49013

Mask shadow pattern

IMX = 4.271023482529318E-01, IMY = 4.758283727882991E-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:
-168.347400 -6.160000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6392  22.0178    0.3  22.5  -18.8   6.9641  42.1    0.4	Crab                          
115.8484  -1.9546    2.7  17.8  139.7   0.7244   4.4 ------	UNKNOWN                       
122.9684 -33.5864    3.0  45.2  176.4   1.2974   3.9 ------	UNKNOWN                       
 96.2496   7.7234    2.5   4.0  -39.4   0.7839   4.6 ------	UNKNOWN                       
112.2295 -50.8335    2.6  57.8 -165.4   3.9281   4.5 ------	UNKNOWN                       
 51.9266  15.0596    3.3  47.9  -51.2   2.9315   3.5 ------	UNKNOWN

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

Time interval of the image:
-6.160000 4.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6477  22.0368   92.5  22.5  -18.8   0.0065   0.1    1.6	Crab                          
122.6391  33.4773    2.5  34.7   58.4   0.4057   4.6 ------	UNKNOWN                       
123.6321 -23.0828    2.6  37.2  166.0   0.3520   4.4 ------	UNKNOWN                       
 67.9008  14.6693    0.2  32.6  -48.1   4.5595  56.7 ------	UNKNOWN                       
 59.7713  -4.0701    2.0  41.3  -79.3   1.2641   5.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

Plot creation:
Sat May 30 17:24:05 EDT 2015