batgrbproduct analysis for trigger=285653

batgrbproduct Analysis for Trigger=285653

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 08:27:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger285653
======================================================================

  Trigger: 00285653      Segment: 000

  BAT Trigger Time: 206704858.432   [s; MET]
      Trigger Stop: 206704859.456   [s; MET]
               UTC: 2007-07-21T10:00:56.330340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 3.17553944498637   Dec: -28.5479948098393  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.23
     Image Trigger?:     NO
     Rate S/N Ratio:     10.0498756211209  [ if not an image trigger ]
     Image S/N Ratio:    8.23

  Flight Position:   [ source = BAT ]
    RA: 3.17553944498637   Dec: -28.5479948098393  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 3.14623321544184   Dec: -28.5321642938372  [deg; J2000]  
        { 00h 12m 35.1s , -28d 31' 55.8" }
         +/- 2.29562272531626 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.915908879229685 [arcmin] (formal 1-sigma fit error)
    SNR: 9.27996237046778
 
  Angular difference between Flight and Ground position is 1.813362 arcmin
 
  Partial Coding Fraction: 0.7265625    [ including projection effects ]

  Duration
     T90: 3.34800001978874 +/- 0.454844996324233
        Measured from: -0.00400000810623169
                   to: 3.34400001168251     [s; relative to TRIGTIME]
     T50: 1.78000000119209 +/- 0.859325303772148
        Measured from: 0.5
                   to: 2.28000000119209     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.119999974966049     
                   to: 1.11999997496605     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.120000004768372     
                   to: 3.44799998402596     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.075288   0.062552   0.014891   0.017087
           0.010335   0.010786   0.009071   0.007809 [error]
 Peak      0.035156   0.032200   0.007338   0.001794
           0.005767   0.005823   0.004798   0.004219 [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 2.16e-08 2.38e-08 1.87e-08 2.41e-08 7.30e-08 8.82e-08   erg/cm2
              Error 4.85e-09 5.08e-09 7.28e-09 1.75e-08 1.77e-08 2.84e-08   erg/cm2
Peak flux Power-law 3.49e-01 2.15e-01 8.51e-02 4.53e-02 6.72e-01 6.94e-01   ph/cm2/s
              Error 8.90e-02 4.85e-02 3.50e-02 3.39e-02 1.41e-01 1.48e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.22e-08 2.93e-08 3.68e-09 9.22e-12 5.52e-08 5.51e-08   erg/cm2
              Error 5.63e-09 8.25e-09 7.81e-09 1.27e-09 1.43e-08 1.43e-08   erg/cm2
Peak flux Cutoff-PL 3.41e-01 2.71e-01 3.39e-02 2.65e-04 6.46e-01 6.46e-01   ph/cm2/s
              Error 9.89e-02 7.16e-02 4.91e-02 1.63e-02 1.37e-01 1.37e-01   ph/cm2/s
 
Fluence        Band 2.27e-08 2.79e-08 1.00e-08 4.58e-09 6.34e-08 6.54e-08   erg/cm2
              Error 5.16e-09 6.99e-09 -------- -------- 1.62e-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    2.348    0.366    -      -           2.12e-03 6.21e-04   67.370 57
CPL  -2.380    5.083      26.8    4.9      4.69e+00 0.00e+00   60.620 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.337    0.408    -      -           3.77e-03 1.20e-03   48.240 57
CPL  -1.224    4.130      27.3    5.8      1.09e+00 0.00e+00   44.980 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.568   -0.120    3.448
T90     3.348   -0.004    3.344
T50     1.780    0.500    2.280
Peak    1.000    0.120    1.120

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
    3.1462   -28.5322   0.0208    31.8690     5.6326         0.1886715      9.280 TRIG_00285653                 
 
Foreground time interval of the image:
 -0.120   3.448 (delta_t =   3.568 [sec])
Background time interval of the image:
-77.131  -0.120 (delta_t =  77.011 [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   -0.120 sec. to    3.448 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.34835     ( -0.343402   0.387979 )
Norm@50keV  : 2.12041E-03    ( -0.000619322   0.000622627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.37 using 59 PHA bins.
# Reduced chi-squared =          1.182 for     57 degrees of freedom 
# Null hypothesis probability =   1.636999e-01
 
Photon flux (15-150 keV)    in 3.568 sec: 0.380787 ( -0.0730832  0.0731472 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.29717e-08 ( -1.71912e-08  1.82506e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.120 sec. to    3.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.38044     ( -7.61101   2.55464 )
Epeak [keV] : 26.7878      ( -4.18508 5.60452 )
Norm@50keV  : 4.68730    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.62 using 59 PHA bins.
# Reduced chi-squared =          1.082 for     56 degrees of freedom 
# Null hypothesis probability =   3.130007e-01
 
Photon flux (15-150 keV)    in 3.568 sec: 0.363794 ( -0.070099  0.070666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.51606e-08 ( -1.27552e-08  1.58516e-08 ) ergs/cm2

Band function

Time interval is from   -0.120 sec. to    3.448 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.95089   ( -4.63507   -4.95089 )
beta        : -3.47459    ( -3.61256   0.867988 )
Epeak [keV] : 24.9348      ( -4.53246 3.64038 )
Norm@50keV   : 523.688    ( -94.3978   1631.93 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.21 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     55 degrees of freedom 
# Null hypothesis probability =   3.579237e-01
 
Photon flux (15-150 keV)    in 3.568 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.34351e-08 ( -6.34101e-08  -1.5696e-08 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 6.88134  (-1.12322  1.36682)
R^2/D10^2   : 0.831006  (-0.440332   0.913241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.81 using 59 PHA bins.
# Reduced chi-squared =          1.067 for     57 degrees of freedom 
# Null hypothesis probability =   3.404122e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.215e-08   7.930e-09
25- 50  2.934e-08   1.038e-08
50-150  4.569e-09   3.064e-09
15-150  5.606e-08   1.580e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 32.1439       (-10.9195      19.8404)
Norm        : 2.96554       (-0.929974     1.41932)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.73 using 59 PHA bins.
# Reduced chi-squared =          1.118 for     57 degrees of freedom 
# Null hypothesis probability =   2.517221e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.227e-08   5.530e-09
25- 50  2.641e-08   7.834e-09
50-150  1.580e-08   9.869e-09
15-150  6.448e-08   1.970e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.67939        (-6.67801      1.30828)
R1^2/D10^2  : 0.920872        (-0.452408      0.48161)
kT2 [keV]   : 198.672        (-199.056      -199.056)
R2^2/D10^2  : 1.61996E-05    (-1.63842e-05   1.34585)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.26 using 59 PHA bins.
# Reduced chi-squared =          1.077 for     55 degrees of freedom 
# Null hypothesis probability =   3.229510e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.245e-08   1.025e-08
25- 50  2.855e-08   1.152e-08
50-150  1.913e-08   3.076e-09
15-150  7.013e-08   2.184e-08

Peak spectrum fit

Power-law model

Time interval is from    0.120 sec. to    1.120 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.33685     ( -0.380055   0.435859 )
Norm@50keV  : 3.76729E-03    ( -0.00120098   0.00119477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.24 using 59 PHA bins.
# Reduced chi-squared =         0.8464 for     57 degrees of freedom 
# Null hypothesis probability =   7.890116e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.672134 ( -0.140878  0.140937 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.62559e-08 ( -9.28679e-09  9.86018e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.120 sec. to    1.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22441     ( -6.18124   2.07889 )
Epeak [keV] : 27.3473      ( -3.3766 8.1802 )
Norm@50keV  : 1.09339    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.98 using 59 PHA bins.
# Reduced chi-squared =         0.8032 for     56 degrees of freedom 
# Null hypothesis probability =   8.541879e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.645764 ( -0.136169  0.137734 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.85374e-08 ( -7.0785e-09  1.03317e-08 ) ergs/cm2

Band function

Time interval is from    0.120 sec. to    1.120 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.94661   ( -6.42584   -4.94661 )
beta        : -3.09711    ( -3.66291   0.742348 )
Epeak [keV] : 24.2549      ( -6.22925 4.70912 )
Norm@50keV   : 1054.81    ( -212.598   7267.47 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.56 using 59 PHA bins.
# Reduced chi-squared =         0.7920 for     55 degrees of freedom 
# Null hypothesis probability =   8.669641e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.27995e-08 ( -3.27925e-08  -9.4678e-09 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 7.04602  (-1.26769  1.56349)
R^2/D10^2   : 1.31836  (-0.748462   1.67984)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.11 using 59 PHA bins.
# Reduced chi-squared =         0.7914 for     57 degrees of freedom 
# Null hypothesis probability =   8.725320e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.059e-08   4.981e-09
25- 50  1.468e-08   5.788e-09
50-150  2.491e-09   1.624e-09
15-150  2.776e-08   1.062e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 33.5495       (-12.5504      25.4641)
Norm        : 5.04019       (-1.72748     2.76065)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.15 using 59 PHA bins.
# Reduced chi-squared =         0.8097 for     57 degrees of freedom 
# Null hypothesis probability =   8.473430e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.081e-08   3.472e-09
25- 50  1.311e-08   4.946e-09
50-150  8.272e-09   5.129e-09
15-150  3.220e-08   1.159e-08

Double BB

R1^2/D10^2  : 1.70790        (      )
kT2 [keV]   : 34.8253        (-32.1643      -32.1643)
R2^2/D10^2  : 9.83511E-04    (   )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.24 using 59 PHA bins.
#Fit statistic : Chi-Squared =          43.64 using 59 PHA bins.
#Fit statistic : Chi-Squared =          43.61 using 59 PHA bins.
# Reduced chi-squared =         0.8044 for     55 degrees of freedom 
# Reduced chi-squared =         0.7934 for     55 degrees of freedom 
# Reduced chi-squared =         0.7930 for     55 degrees of freedom 
# Null hypothesis probability =   8.500279e-01
# Null hypothesis probability =   8.651436e-01
# Null hypothesis probability =   8.657029e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.129e-08   7.730e-09
25- 50  1.480e-08   1.111e-08
50-150  8.200e-09   7.165e-09
15-150  3.429e-08   2.127e-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: 2.34835     ( -0.343402   0.387979 )
Norm@50keV  : 2.12041E-03    ( -0.000619322   0.000622627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.37 using 59 PHA bins.
# Reduced chi-squared =          1.182 for     57 degrees of freedom 
# Null hypothesis probability =   1.636999e-01
 
Photon flux (15-150 keV)    in 3.568 sec: 0.380787 ( -0.0730832  0.0731472 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.29717e-08 ( -1.71912e-08  1.82506e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.38044     ( -7.61101   2.55464 )
Epeak [keV] : 26.7878      ( -4.18508 5.60452 )
Norm@50keV  : 4.68730    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.62 using 59 PHA bins.
# Reduced chi-squared =          1.082 for     56 degrees of freedom 
# Null hypothesis probability =   3.130007e-01
 
Photon flux (15-150 keV)    in 3.568 sec: 0.363794 ( -0.070099  0.070666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.51606e-08 ( -1.27552e-08  1.58516e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.95089   ( -4.63507   -4.95089 )
beta        : -3.47459    ( -3.61256   0.867988 )
Epeak [keV] : 24.9348      ( -4.53246 3.64038 )
Norm@50keV   : 523.688    ( -94.3978   1631.93 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.21 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     55 degrees of freedom 
# Null hypothesis probability =   3.579237e-01
 
Photon flux (15-150 keV)    in 3.568 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.34351e-08 ( -6.34101e-08  -1.5696e-08 ) ergs/cm2

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

S(25-50 keV)  = 2.38e-08
S(50-100 keV) = 1.87e-08

T90 vs. Hardness ratio plot

T90                                   = 3.34800001978874 sec.
Hardness ratio (energy fluence ratio) = 0.785714

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.830836
Count Ratio (50-100 keV) / (15-25 keV) = 0.197787

Mask shadow pattern

IMX = 6.186923740375682E-01, IMY = -6.101821912772279E-02

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:
-77.131410 -0.120000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2622  38.3558    2.9  44.3  169.3   0.5997   4.0    4.7	Cyg X-2                       
342.7989 -48.2214    2.4  51.3   30.5   1.8114   4.8 ------	UNKNOWN                       
316.3383  30.6859    2.1  45.7  153.5   1.1119   5.5 ------	UNKNOWN                       
316.1696  40.3081    2.5  51.3  164.0   1.3141   4.7 ------	UNKNOWN                       
351.4484  36.5794    2.3  34.5 -162.8   0.4493   4.9 ------	UNKNOWN

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

Time interval of the image:
-0.120000 3.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.2004  38.5169    0.0  44.4  169.4  -0.0491  -1.5   11.8	Cyg X-2                       
  3.1462 -28.5322    1.2  31.9    5.6   0.1887   9.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
67.468600 962.627600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
329.1010 -37.5507    2.9  29.7   70.6   2.2003   3.9 ------	UNKNOWN                       
344.7935 -35.7815    2.3  17.1   67.4   1.8174   5.0 ------	UNKNOWN                       
 64.9053 -46.4855    4.8  50.7  -44.5   5.7207   2.4 ------	UNKNOWN                       
 59.4791 -40.2264    4.9  47.1  -53.1   5.1197   2.4 ------	UNKNOWN

Plot creation:
Sun May 31 09:43:26 EDT 2015