batgrbproduct analysis for trigger=258408

batgrbproduct Analysis for Trigger=258408

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 11:47:43 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger258408
======================================================================

  Trigger: 00258408      Segment: 000

  BAT Trigger Time: 191806512   [s; MET]
      Trigger Stop: 191806576   [s; MET]
               UTC: 2007-01-29T23:35:10.269080    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 37.0138693588457   Dec: 11.6974043453265  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.28
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.28

  Flight Position:   [ source = BAT ]
    RA: 37.0138693588457   Dec: 11.6974043453265  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 37.0139   Dec: 11.6974  [deg; J2000]
        { 02h 28m 03.3s , +11d 41' 50.6" }
        +/- 2.45655729298 [arcmin] (estimated 90% radius based on SNR)
    SNR: 8.42491143666
 
 
  Angular difference between Flight and Ground position is 0.001819 arcmin
 
  Partial Coding Fraction: 0.4257812    [ including projection effects ]

  Duration
     T90: 459.748000025749 +/- 25.2120545784732
        Measured from: -96.7120000123978
                   to: 363.036000013351     [s; relative to TRIGTIME]
     T50: 273.296000003815 +/- 25.2466089568738
        Measured from: 39.972000002861
                   to: 313.268000006676     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 310.567999988794     
                   to: 311.567999988794     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -130.611999988556     
                   to: 373.888000011444     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.182987   2.276878   1.114787   0.198249
           0.134575   0.141483   0.126909   0.114768 [error]
 Peak      0.030356   0.024540   0.015055   0.009168
           0.005085   0.005223   0.004722   0.003735 [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 6.60e-07 9.01e-07 9.07e-07 1.66e-06 3.00e-06 4.12e-06   erg/cm2
              Error 7.24e-08 6.64e-08 1.20e-07 4.41e-07 2.69e-07 5.65e-07   erg/cm2
Peak flux Power-law 2.36e-01 1.86e-01 9.91e-02 7.65e-02 5.56e-01 5.98e-01   ph/cm2/s
              Error 6.63e-02 3.96e-02 3.57e-02 5.20e-02 1.17e-01 1.31e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.36e-07 9.37e-07 8.92e-07 8.70e-07 2.88e-06 3.34e-06   erg/cm2
              Error 8.31e-08 9.03e-08 1.32e-07 7.23e-07 3.34e-07 1.03e-06   erg/cm2
Peak flux Cutoff-PL 2.29e-01 2.00e-01 9.65e-02 3.42e-02 5.49e-01 5.60e-01   ph/cm2/s
              Error 7.07e-02 5.23e-02 4.16e-02 6.52e-02 1.18e-01 1.42e-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    1.990    0.149    -      -           6.45e-04 6.08e-05   65.570 57
CPL   1.634    0.616      43.5   -3.3      1.03e-03 1.04e-03   64.610 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.913    0.389    -      -           3.86e-03 1.06e-03   64.640 57
CPL   1.387    1.311      46.1   -0.1      8.04e-03 5.88e-02   64.240 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: 462.784000 sec.
T50 in the 50-300 keV band: 290.304000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  504.500 -130.612  373.888
T90   459.748  -96.712  363.036
T50   273.296   39.972  313.268
Peak    1.000  310.568  311.568

Click here for the BAT GCN circular template

Special notes of this burst

Image

Pre-slew 15.0-50.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
37.014 11.697 0.000 29.057 79.341 0.698 8.425 TRIG_00258408
 
Image time interval: 0.000 to 64.000 [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 64.000000

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 64.000000

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 64.000000

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 -130.612 sec. to  373.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.98959     ( -0.145678   0.151615 )
Norm@50keV  : 6.45477E-04    ( -6.13197e-05   6.02093e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.57 using 59 PHA bins.
# Reduced chi-squared =          1.150 for     57 degrees of freedom 
# Null hypothesis probability =   2.039209e-01
 
Photon flux (15-150 keV)    in 504.5 sec: 9.63610E-02 ( -0.00711318  0.00711656 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.00147e-06 ( -2.67014e-07  2.71835e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from -130.612 sec. to  373.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.63367     ( -0.705788   0.525419 )
Epeak [keV] : 43.4988      ( -36.9382 -43.5019 )
Norm@50keV  : 1.02840E-03    ( -0.000531797   0.00155415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.61 using 59 PHA bins.
# Reduced chi-squared =          1.154 for     56 degrees of freedom 
# Null hypothesis probability =   2.010612e-01
 
Photon flux (15-150 keV)    in 504.5 sec: 9.45600E-02 ( -0.0077463  0.007727 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88094e-06 ( -3.2844e-07  3.40215e-07 ) ergs/cm2

Band function

Time interval is from -130.612 sec. to  373.888 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.48559   ( 1.49315   1.49315 )
beta        : -2.33283    ( 2.3303   0.446929 )
Epeak [keV] : 41.5124      ( -41.5637 35.2589 )
Norm@50keV   : 1.26292E-03    ( -0.00062295   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.29 using 59 PHA bins.
# Reduced chi-squared =          1.169 for     55 degrees of freedom 
# Null hypothesis probability =   1.831662e-01
 
Photon flux (15-150 keV)    in 504.5 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]    : 10.1457  (-0.871026  0.956074)
R^2/D10^2   : 4.12032E-02  (-0.0120057   0.0169025)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          97.31 using 59 PHA bins.
# Reduced chi-squared =          1.707 for     57 degrees of freedom 
# Null hypothesis probability =   7.029959e-04
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.379e-07   5.898e-08
25- 50  1.111e-06   9.888e-08
50-150  6.045e-07   1.210e-07
15-150  2.153e-06   1.973e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 68.2194       (-15.1225      22.0711)
Norm        : 0.473055       (-0.0566572     0.0670461)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.25 using 59 PHA bins.
# Reduced chi-squared =          1.145 for     57 degrees of freedom 
# Null hypothesis probability =   2.118515e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.105e-07   6.104e-08
25- 50  9.646e-07   7.542e-08
50-150  1.215e-06   2.454e-07
15-150  2.790e-06   2.916e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.54737        (-1.64777      2.22597)
R1^2/D10^2  : 0.556920        (-0.408716      4.19128)
kT2 [keV]   : 15.0846        (-2.95451      7.6601)
R2^2/D10^2  : 7.20554E-03    (-0.00590147   0.0111206)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.22 using 59 PHA bins.
# Reduced chi-squared =          1.240 for     55 degrees of freedom 
# Null hypothesis probability =   1.086300e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.331e-07   2.795e-07
25- 50  9.271e-07   3.014e-07
50-150  1.079e-06   3.751e-07
15-150  2.639e-06   9.099e-07

Peak spectrum fit

Power-law model

Time interval is from  310.568 sec. to  311.568 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.91253     ( -0.366824   0.410395 )
Norm@50keV  : 3.85674E-03    ( -0.00108466   0.00104108 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.64 using 59 PHA bins.
# Reduced chi-squared =          1.134 for     57 degrees of freedom 
# Null hypothesis probability =   2.272289e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.556450 ( -0.116806  0.116839 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5463e-08 ( -9.35894e-09  9.85609e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from  310.568 sec. to  311.568 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.38659     ( -1.845   0.777702 )
Epeak [keV] : 46.0707      ( -45.9695 -46.073 )
Norm@50keV  : 8.03523E-03    ( -0.00803427   0.109624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.24 using 59 PHA bins.
# Reduced chi-squared =          1.147 for     56 degrees of freedom 
# Null hypothesis probability =   2.102817e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.548512 ( -0.117707  0.118501 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.32549e-08 ( -9.9831e-09  1.12881e-08 ) ergs/cm2

Band function

Time interval is from  310.568 sec. to  311.568 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.97011   ( -4.97011   -4.97011 )
beta        : -2.13920    ( -0.732214   0.46669 )
Epeak [keV] : 22.3638      ( -22.3638 6.13689 )
Norm@50keV   : 1227.63    ( -253.307   4.73221e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.83 using 59 PHA bins.
# Reduced chi-squared =          1.142 for     55 degrees of freedom 
# Null hypothesis probability =   2.185424e-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]    : 8.98677  (-2.31239  3.36743)
R^2/D10^2   : 0.389835  (-0.269374   0.819764)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.70 using 59 PHA bins.
# Reduced chi-squared =          1.223 for     57 degrees of freedom 
# Null hypothesis probability =   1.204585e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.125e-09   2.475e-09
25- 50  1.299e-08   5.423e-09
50-150  4.933e-09   2.963e-09
15-150  2.405e-08   9.260e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 71.3702       (-34.5828      113.881)
Norm        : 2.74178       (-0.732306     1.12555)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.23 using 59 PHA bins.
# Reduced chi-squared =          1.127 for     57 degrees of freedom 
# Null hypothesis probability =   2.380517e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.048e-09   2.486e-09
25- 50  1.127e-08   4.410e-09
50-150  1.469e-08   1.171e-08
15-150  3.301e-08   1.377e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.43664        (-1.94879      2.71168)
R1^2/D10^2  : 1.91730        (-1.49902      10.0868)
kT2 [keV]   : 19.5973        (-15.8894      34.7477)
R2^2/D10^2  : 1.44737E-02    (-0.0150244   0.0887363)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.92 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     55 degrees of freedom 
# Null hypothesis probability =   2.164194e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.523e-09   4.338e-09
25- 50  1.045e-08   5.415e-09
50-150  1.537e-08   9.830e-09
15-150  3.335e-08   1.772e-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: 2.00007     ( -0.312446   0.348634 )
Norm@50keV  : 5.54421E-04    ( -0.000124218   0.000118227 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.58 using 59 PHA bins.
# Reduced chi-squared =         0.9225 for     57 degrees of freedom 
# Null hypothesis probability =   6.413215e-01
 
Photon flux (15-150 keV)    in 202.7 sec: 8.31657E-02 ( -0.0131802  0.0131802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03626e-06 ( -2.09373e-07  2.18357e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.25918     ( -1.55099   0.129721 )
Epeak [keV] : 103.753      (   )
Norm@50keV  : 4.02430E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.43 using 59 PHA bins.
# Reduced chi-squared =         0.9362 for     56 degrees of freedom 
# Null hypothesis probability =   6.109630e-01
 
Photon flux (15-150 keV)    in 202.7 sec: 8.31282E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.0346e-06 ( -2.34449e-07  2.29665e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.55942   ( 1.56061   1.56061 )
beta        : -1.99996    ( 2.00003   0.312626 )
Epeak [keV] : 12.1606      ( -11.8268 -11.8268 )
Norm@50keV   : 1.60565E-03    ( -0.00161718   0.575968 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.58 using 59 PHA bins.
# Reduced chi-squared =         0.9561 for     55 degrees of freedom 
# Null hypothesis probability =   5.675224e-01
 
Photon flux (15-150 keV)    in 202.7 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)  = 9.01e-07
S(50-100 keV) = 9.07e-07

T90 vs. Hardness ratio plot

T90                                   = 459.748000025749 sec.
Hardness ratio (energy fluence ratio) = 1.00666

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.04301
Count Ratio (50-100 keV) / (15-25 keV) = 0.51067

Mask shadow pattern

IMX = 0.102762484959, IMY = -0.546020944351

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:
-239.000000 -130.612000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.1498  38.2903   22.2  54.8  -29.3  -0.2567  -0.5    2.1	Cyg X-2                       
 18.2820  48.0035    2.4  47.7   19.9   1.3382   4.9 ------	UNKNOWN                       
330.7031 -12.6310    2.5  41.1  -98.2   2.3259   4.7 ------	UNKNOWN

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

Time interval of the image:
-130.612000 72.100600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.0678  38.2103   12.6  54.8  -29.4   0.9201   0.9    8.3	Cyg X-2                       
 36.9945  11.7127    1.8  29.0   79.3   2.1965   6.3 ------	UNKNOWN                       
 16.1276  37.4404    2.3  37.0   20.6   1.6964   5.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
123.100600 963.101700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
  8.9006  64.9987    3.1  56.7    4.7   7.7498   3.7 ------	UNKNOWN                       
 37.0202  11.6965    1.1   0.0  105.7   4.0367  10.5 ------	UNKNOWN                       
357.1600  58.3675    3.1  55.5   -5.6   4.9080   3.8 ------	UNKNOWN                       
  3.7494  20.2438    3.2  33.0  -52.2   2.3796   3.7 ------	UNKNOWN

Plot creation:
Thu Oct  8 20:38:00 EDT 2015