batgrbproduct analysis for trigger=458521

batgrbproduct Analysis for Trigger=458521

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 13 21:29:56 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger458521
======================================================================

  Trigger: 00458521      Segment: 000

  BAT Trigger Time: 333920990.208   [s; MET]
      Trigger Stop: 333920994.304   [s; MET]
               UTC: 2011-08-01T19:49:42.991200    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 89.2848875077534   Dec: 80.9884210932685  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.83
     Image Trigger?:     NO
     Rate S/N Ratio:     8.83176086632785  [ if not an image trigger ]
     Image S/N Ratio:    7.83

  Flight Position:   [ source = BAT ]
    RA: 89.2848875077534   Dec: 80.9884210932685  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 89.416242005594   Dec: 80.9572340073404  [deg; J2000]  
        { 05h 57m 39.9s , +80d 57' 26.0" }
         +/- 1.08438811435936 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.293137695503621 [arcmin] (formal 1-sigma fit error)
    SNR: 27.0928350684791
 
  Angular difference between Flight and Ground position is 2.242909 arcmin
 
  Partial Coding Fraction: 0.78125    [ including projection effects ]

  Duration
     T90: 385.255999922752 +/- 8.93474856746104
        Measured from: -11.6999999880791
                   to: 373.555999934673     [s; relative to TRIGTIME]
     T50: 332.339999914169 +/- 7.41289037205683
        Measured from: 8.88800001144409
                   to: 341.227999925613     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 341.783999979496     
                   to: 342.783999979496     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.0879999995232     
                   to: 384.987999975681     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.830347   3.041402   1.978421   0.363293
           0.122160   0.127517   0.117940   0.114943 [error]
 Peak      0.041048   0.051775   0.028862   0.010582
           0.006560   0.006817   0.006020   0.005671 [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 8.59e-07 1.30e-06 1.46e-06 3.14e-06 4.56e-06 6.76e-06   erg/cm2
              Error 7.08e-08 6.45e-08 1.18e-07 5.33e-07 2.65e-07 6.34e-07   erg/cm2
Peak flux Power-law 4.16e-01 3.39e-01 1.87e-01 1.51e-01 1.01e+00 1.09e+00   ph/cm2/s
              Error 9.06e-02 5.17e-02 4.81e-02 7.48e-02 1.53e-01 1.73e-01   ph/cm2/s
 
Fluence   Cutoff-PL 8.33e-07 1.32e-06 1.46e-06 2.17e-06 4.45e-06 5.79e-06   erg/cm2
              Error 8.21e-08 7.88e-08 1.22e-07 1.18e-06 3.19e-07 1.18e-06   erg/cm2
Peak flux Cutoff-PL 4.08e-01 3.48e-01 1.87e-01 1.09e-01 1.00e+00 1.05e+00   ph/cm2/s
              Error 9.67e-02 6.31e-02 5.06e-02 1.16e-01 1.56e-01 1.95e-01   ph/cm2/s
 
Fluence        Band 8.23e-07 1.32e-06 1.46e-06 2.10e-06 4.44e-06 5.71e-06   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    1.824    0.100    -      -           1.21e-03 6.90e-05   76.810 57
CPL   1.611    0.342      83.5  -27.0      1.57e-03 6.87e-04   75.820 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.859    0.290    -      -           7.15e-03 1.39e-03   60.490 57
CPL   1.646    0.865      70.5   -0.0      9.49e-03 2.12e-02   60.330 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: 498.880000 sec.
T50 in the 50-300 keV band: 180.928000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  409.076  -24.088  384.988
T90   385.256  -11.700  373.556
T50   332.340    8.888  341.228
Peak    1.000  341.784  342.784

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
   89.4162    80.9572   0.0071    25.3158  -132.0587         3.6557287     27.093 TRIG_00458521                 
 
Foreground time interval of the image:
-24.088  38.493 (delta_t =  62.581 [sec])
Background time interval of the image:
-239.208 -24.088 (delta_t = 215.120 [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)

The mask-weighted light curves based on cleaned DPHs

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  -24.088 sec. to  384.988 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82410     ( -0.0989145   0.100644 )
Norm@50keV  : 1.21174E-03    ( -6.93572e-05   6.86786e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.81 using 59 PHA bins.
# Reduced chi-squared =          1.347 for     57 degrees of freedom 
# Null hypothesis probability =   4.126035e-02
 
Photon flux (15-150 keV)    in 409.1 sec: 0.168561 ( -0.00854817  0.00856011 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.56036e-06 ( -2.64026e-07  2.66783e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -24.088 sec. to  384.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.61094     ( -0.39488   0.290032 )
Epeak [keV] : 83.4516      ( -29.4864 -83.4516 )
Norm@50keV  : 1.57494E-03    ( -0.000417384   0.000957598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.82 using 59 PHA bins.
# Reduced chi-squared =          1.354 for     56 degrees of freedom 
# Null hypothesis probability =   4.005293e-02
 
Photon flux (15-150 keV)    in 409.1 sec: 0.166178 ( -0.00941  0.009409 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.45367e-06 ( -3.19057e-07  3.19548e-07 ) ergs/cm2

Band function

Time interval is from  -24.088 sec. to  384.988 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.61096   ( 1.19245   1.19245 )
beta        : -9.33694    ( 9.35615   19.3561 )
Epeak [keV] : 83.4387      ( -27.8167 124.046 )
Norm@50keV   : 1.57458E-03    ( -0.000409065   0.000721073 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.82 using 59 PHA bins.
# Reduced chi-squared =          1.379 for     55 degrees of freedom 
# Null hypothesis probability =   3.284833e-02
 
Photon flux (15-150 keV)    in 409.1 sec: 0.166293 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.43828e-06 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 11.9011  (  )
R^2/D10^2   : 3.92808E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         170.83 using 59 PHA bins.
# Reduced chi-squared =         2.9970 for     57 degrees of freedom 
# Null hypothesis probability =   2.682571e-13
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.811e-07   4.193e-08
25- 50  1.499e-06   8.796e-08
50-150  1.270e-06   1.638e-07
15-150  3.250e-06   2.095e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 98.7745       (-18.3628      26.0418)
Norm        : 0.734781       (-0.0539187     0.0609906)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.66 using 59 PHA bins.
# Reduced chi-squared =          1.362 for     57 degrees of freedom 
# Null hypothesis probability =   3.582433e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.856e-07   7.200e-08
25- 50  1.355e-06   8.182e-08
50-150  2.181e-06   6.153e-07
15-150  4.321e-06   6.662e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.42163        (-0.751439      0.842428)
R1^2/D10^2  : 0.511953        (-0.217982      0.429802)
kT2 [keV]   : 20.1370        (-2.50729      3.39124)
R2^2/D10^2  : 4.54602E-03    (-0.00202725   0.00305704)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.26 using 59 PHA bins.
# Reduced chi-squared =          1.314 for     55 degrees of freedom 
# Null hypothesis probability =   5.916492e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.416e-07   1.608e-07
25- 50  1.278e-06   1.847e-07
50-150  2.216e-06   4.735e-07
15-150  4.335e-06   7.822e-07

Peak spectrum fit

Power-law model

Time interval is from  341.784 sec. to  342.784 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.85918     ( -0.278597   0.300983 )
Norm@50keV  : 7.15213E-03    ( -0.00141261   0.00136215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.49 using 59 PHA bins.
# Reduced chi-squared =          1.061 for     57 degrees of freedom 
# Null hypothesis probability =   3.511722e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.00908 ( -0.153361  0.153363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.57558e-08 ( -1.25851e-08  1.30532e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  341.784 sec. to  342.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64629     ( -1.11655   0.612976 )
Epeak [keV] : 70.4826      ( -70.457 -70.4819 )
Norm@50keV  : 9.49044E-03    ( -0.00949053   0.0328984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.33 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     56 degrees of freedom 
# Null hypothesis probability =   3.221352e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.00135 ( -0.156389  0.15646 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.42129e-08 ( -1.40545e-08  1.41855e-08 ) ergs/cm2

Band function

Time interval is from  341.784 sec. to  342.784 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.64672   ( -1.68029   0.978241 )
beta        : -10.0000    ( 10   0 )
Epeak [keV] : 70.5328      ( -63.8809 -70.5328 )
Norm@50keV   : 9.48299E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.33 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     55 degrees of freedom 
# Null hypothesis probability =   2.891761e-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]    : 9.42921  (-1.74048  2.41442)
R^2/D10^2   : 0.578523  (-0.330444   0.677257)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.48 using 59 PHA bins.
# Reduced chi-squared =          1.271 for     57 degrees of freedom 
# Null hypothesis probability =   8.121698e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.024e-08   2.905e-09
25- 50  2.337e-08   5.125e-09
50-150  1.026e-08   4.630e-09
15-150  4.387e-08   1.093e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 85.8209       (-36.0763      95.8191)
Norm        : 4.64277       (-0.931436     1.24409)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.66 using 59 PHA bins.
# Reduced chi-squared =          1.064 for     57 degrees of freedom 
# Null hypothesis probability =   3.454322e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.209e-08   2.677e-09
25- 50  2.024e-08   4.060e-09
50-150  2.991e-08   1.840e-08
15-150  6.224e-08   2.245e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.15377        (-1.65551      1.85819)
R1^2/D10^2  : 2.20725        (-1.37252      5.3535)
kT2 [keV]   : 25.0648        (-8.40063      20.0971)
R2^2/D10^2  : 1.15119E-02    (-0.010357   0.0454041)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.67 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     55 degrees of freedom 
# Null hypothesis probability =   3.425400e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.276e-08   7.045e-09
25- 50  1.925e-08   1.024e-08
50-150  3.442e-08   2.142e-08
15-150  6.643e-08   3.579e-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: 1.66014     ( -0.0985289   0.0995812 )
Norm@50keV  : 3.71380E-03    ( -0.000203342   0.00020197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.14 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     57 degrees of freedom 
# Null hypothesis probability =   2.146746e-01
 
Photon flux (15-150 keV)    in 62.58 sec: 0.486564 ( -0.0253898  0.0254453 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.15934e-06 ( -1.263e-07  1.27383e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.63722     ( -0.381836   0.121029 )
Epeak [keV] : 758.852      (   )
Norm@50keV  : 3.81704E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.12 using 59 PHA bins.
# Reduced chi-squared =          1.163 for     56 degrees of freedom 
# Null hypothesis probability =   1.889934e-01
 
Photon flux (15-150 keV)    in 62.58 sec: 0.485006 ( -0.026918  0.026745 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.14911e-06 ( -1.44816e-07  1.36781e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.769974   ( 1.08751   1.08751 )
beta        : -1.68009    ( 1.67708   0.110531 )
Epeak [keV] : 34.2509      ( -33.8239 -33.8239 )
Norm@50keV   : 1.71696E-02    ( -0.017785   619.393 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.82 using 59 PHA bins.
# Reduced chi-squared =          1.179 for     55 degrees of freedom 
# Null hypothesis probability =   1.714644e-01
 
Photon flux (15-150 keV)    in 62.58 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)  = 1.30e-06
S(50-100 keV) = 1.46e-06

T90 vs. Hardness ratio plot

T90                                   = 385.255999922752 sec.
Hardness ratio (energy fluence ratio) = 1.12308

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.07457
Count Ratio (50-100 keV) / (15-25 keV) = 0.699003

Mask shadow pattern

IMX = -3.168826698086088E-01, IMY = 3.512100248643446E-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:
-239.208000 -24.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 43.0404   8.0492    2.5  55.1    8.9   4.9786   4.7 ------	UNKNOWN                       
 70.6707  35.3960    2.7  38.0  -38.0   1.2884   4.3 ------	UNKNOWN                       
 99.4821  54.0427    3.3  37.4  -83.5   2.2137   3.5 ------	UNKNOWN

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

Time interval of the image:
-24.088000 38.492610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 89.4163  80.9572    0.4  25.3 -132.1   3.6557  27.1 ------	UNKNOWN                       
 69.0541  28.1746    1.9  43.6  -30.7   1.3100   6.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
87.692600 962.907100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.6891  54.5465    2.7  43.8  154.6   5.3048   4.3 ------	UNKNOWN                       
 38.0833  47.4644    2.6  37.4   15.1   3.5133   4.5 ------	UNKNOWN                       
 89.3239  80.9721    1.3   0.0  -97.0   4.7346   8.8 ------	UNKNOWN                       
130.9985  53.2003    2.5  30.6  -96.6   3.6674   4.7 ------	UNKNOWN                       
147.8787  52.9130    2.9  33.2 -115.2   3.6186   4.0 ------	UNKNOWN                       
 69.9515  22.6755    3.4  58.9  -24.1  13.5399   3.5 ------	UNKNOWN                       
183.2005  35.8842    3.3  55.3 -145.3  16.9525   3.6 ------	UNKNOWN                       
182.8224  35.8110    6.4  55.3 -144.9   9.3154   2.2 ------	UNKNOWN                       
170.2602  39.9928    2.8  49.2 -133.6  10.9398   4.1 ------	UNKNOWN                       
 91.9591  31.9307    3.3  49.1  -48.0  10.2028   3.5 ------	UNKNOWN

Plot creation:
Sat May 30 21:53:17 EDT 2015