batgrbproduct analysis for trigger=284850

batgrbproduct Analysis for Trigger=284850

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 08:37:11 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger284850
======================================================================

  Trigger: 00284850      Segment: 000

  BAT Trigger Time: 206076032.704   [s; MET]
      Trigger Stop: 206076033.216   [s; MET]
               UTC: 2007-07-14T03:20:30.618220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 42.9432215418995   Dec: 30.235985840538  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.37
     Image Trigger?:     NO
     Rate S/N Ratio:     24.454038521275  [ if not an image trigger ]
     Image S/N Ratio:    12.37

  Flight Position:   [ source = BAT ]
    RA: 42.9432215418995   Dec: 30.235985840538  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 42.9286259990656   Dec: 30.2398419545068  [deg; J2000]  
        { 02h 51m 42.9s , +30d 14' 23.4" }
         +/- 1.2533164455008 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.431665134042676 [arcmin] (formal 1-sigma fit error)
    SNR: 22.0308681298215
 
  Angular difference between Flight and Ground position is 0.791168 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 3 +/- 1.4142135623731
        Measured from: -0.703999996185303
                   to: 2.2960000038147     [s; relative to TRIGTIME]
     T50: 1 +/- 1
        Measured from: 0.296000003814697
                   to: 1.2960000038147     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.296000003814697     
                   to: 1.2960000038147     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.703999996185303     
                   to: 2.2960000038147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.186677   0.129387   0.033255   0.034524
           0.009777   0.009814   0.008531   0.008561 [error]
 Peak      0.113440   0.082213   0.018424   0.016212
           0.006271   0.006101   0.005059   0.005037 [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 5.33e-08 5.17e-08 3.50e-08 3.71e-08 1.55e-07 1.77e-07   erg/cm2
              Error 5.89e-09 4.85e-09 7.03e-09 1.41e-08 1.58e-08 2.36e-08   erg/cm2
Peak flux Power-law 1.08e+00 5.79e-01 1.94e-01 8.45e-02 1.90e+00 1.94e+00   ph/cm2/s
              Error 1.22e-01 5.28e-02 3.69e-02 2.94e-02 1.60e-01 1.62e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.29e-08 5.27e-08 3.30e-08 2.12e-08 1.50e-07 1.60e-07   erg/cm2
              Error 6.28e-09 6.20e-09 1.03e-08 2.61e-08 2.14e-08 3.60e-08   erg/cm2
Peak flux Cutoff-PL 1.03e+00 6.23e-01 1.66e-01 2.16e-02 1.84e+00 1.84e+00   ph/cm2/s
              Error 1.36e-01 7.26e-02 5.13e-02 4.58e-02 1.71e-01 1.77e-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    2.563    0.201    -      -           5.07e-03 7.33e-04   48.090 57
CPL   1.948    0.000       2.9    0.0      1.26e-02 0.00e+00   48.270 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.576    0.196    -      -           9.22e-03 1.31e-03   59.090 57
CPL   1.730    0.724      11.0    0.0      3.21e-02 0.00e+00   56.860 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: 1.728000 sec.
T50 in the 50-300 keV band: 0.960000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.000   -0.704    2.296
T90     3.000   -0.704    2.296
T50     1.000    0.296    1.296
Peak    1.000    0.296    1.296

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
   42.9286    30.2398   0.0087    12.6165    38.0430         0.3935835     22.031 TRIG_00284850                 
 
Foreground time interval of the image:
 -0.704   2.296 (delta_t =   3.000 [sec])
Background time interval of the image:
-239.704  -0.704 (delta_t = 239.000 [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

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   -0.704 sec. to    2.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.56336     ( -0.194866   0.207184 )
Norm@50keV  : 5.07235E-03    ( -0.000733229   0.000731887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.09 using 59 PHA bins.
# Reduced chi-squared =         0.8437 for     57 degrees of freedom 
# Null hypothesis probability =   7.936561e-01
 
Photon flux (15-150 keV)    in 3 sec: 1.03642 ( -0.0856047  0.0856442 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.54907e-07 ( -1.55137e-08  1.59959e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.704 sec. to    2.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94754     (     )
Epeak [keV] : 2.91899      (   )
Norm@50keV  : 1.26087E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.27 using 59 PHA bins.
# Reduced chi-squared =         0.8619 for     56 degrees of freedom 
# Null hypothesis probability =   7.590736e-01
 
Photon flux (15-150 keV)    in 3 sec: 1.02523 ( -0.097164  0.0938 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49984e-07 ( -2.24334e-08  2.02977e-08 ) ergs/cm2

Band function

Time interval is from   -0.704 sec. to    2.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.72463   ( 1.72718   1.72718 )
beta        : -2.75127    ( 2.75149   0.35541 )
Epeak [keV] : 9.67152      ( -9.51041 13.9712 )
Norm@50keV   : 1.93060E-02    ( -0.00886369   5371.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.37 using 59 PHA bins.
# Reduced chi-squared =         0.8613 for     55 degrees of freedom 
# Null hypothesis probability =   7.579296e-01
 
Photon flux (15-150 keV)    in 3 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]    : 6.97822  (-0.641582  0.699336)
R^2/D10^2   : 1.89006  (-0.63498   0.980443)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.03 using 59 PHA bins.
# Reduced chi-squared =          1.193 for     57 degrees of freedom 
# Null hypothesis probability =   1.504404e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.421e-08   5.955e-09
25- 50  6.018e-08   7.065e-09
50-150  9.862e-09   3.204e-09
15-150  1.143e-07   1.047e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 28.7025       (-5.38787      7.2126)
Norm        : 8.45959       (-1.59506     2.06096)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.78 using 59 PHA bins.
# Reduced chi-squared =         0.8733 for     57 degrees of freedom 
# Null hypothesis probability =   7.403302e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.046e-08   5.835e-09
25- 50  5.624e-08   5.760e-09
50-150  2.904e-08   9.217e-09
15-150  1.357e-07   1.484e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.96177        (-1.41607      2.4025)
R1^2/D10^2  : 14.8373        (-11.9603      115.978)
kT2 [keV]   : 11.1606        (-2.76959      -11.1734)
R2^2/D10^2  : 0.178145    (-0.176784   0.242654)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.05 using 59 PHA bins.
# Reduced chi-squared =         0.9099 for     55 degrees of freedom 
# Null hypothesis probability =   6.638857e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.258e-08   2.789e-08
25- 50  5.374e-08   2.466e-08
50-150  2.873e-08   1.707e-08
15-150  1.351e-07   6.908e-08

Peak spectrum fit

Power-law model

Time interval is from    0.296 sec. to    1.296 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.57555     ( -0.189818   0.202037 )
Norm@50keV  : 9.22000E-03    ( -0.00131387   0.00130995 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.09 using 59 PHA bins.
# Reduced chi-squared =          1.037 for     57 degrees of freedom 
# Null hypothesis probability =   3.991322e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.89843 ( -0.159981  0.160041 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.41984e-08 ( -9.40756e-09  9.65746e-09 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.296 sec. to    1.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73045     ( -1.16617   0.282091 )
Epeak [keV] : 10.9990      (   )
Norm@50keV  : 3.21196E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.86 using 59 PHA bins.
# Reduced chi-squared =          1.015 for     56 degrees of freedom 
# Null hypothesis probability =   4.426503e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.83798 ( -0.17043  0.17222 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.61787e-08 ( -1.0452e-08  1.27933e-08 ) ergs/cm2

Band function

Time interval is from    0.296 sec. to    1.296 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.15479   (     )
beta        : -8.20043    (     )
Epeak [keV] : 61.6253      (   )
Norm@50keV   : 2.55812E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         114.81 using 59 PHA bins.
# Reduced chi-squared =         2.0874 for     55 degrees of freedom 
# Null hypothesis probability =   4.173337e-06
 
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]    : 7.21142  (-0.654651  0.710153)
R^2/D10^2   : 3.04924  (-1.00931   1.54478)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.69 using 59 PHA bins.
# Reduced chi-squared =          1.293 for     57 degrees of freedom 
# Null hypothesis probability =   6.768927e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.625e-08   3.530e-09
25- 50  3.805e-08   4.075e-09
50-150  7.014e-09   2.160e-09
15-150  7.131e-08   7.615e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 29.1171       (-5.2843      6.95218)
Norm        : 15.3967       (-2.82005     3.59951)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.21 using 59 PHA bins.
# Reduced chi-squared =          1.004 for     57 degrees of freedom 
# Null hypothesis probability =   4.671964e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.085e-08   3.265e-09
25- 50  3.467e-08   3.520e-09
50-150  1.825e-08   5.645e-09
15-150  8.377e-08   8.690e-09

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.49337        (-1.23766      1.51751)
R1^2/D10^2  : 43.6699        (-33.5774      450.927)
kT2 [keV]   : 10.0045        (-1.81337      3.76152)
R2^2/D10^2  : 0.582838    (-0.465887   0.974455)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.83 using 59 PHA bins.
# Reduced chi-squared =          1.033 for     55 degrees of freedom 
# Null hypothesis probability =   4.068164e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.169e-08   1.537e-08
25- 50  3.434e-08   1.804e-08
50-150  1.547e-08   8.761e-09
15-150  8.150e-08   4.008e-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: 2.56336     ( -0.194866   0.207184 )
Norm@50keV  : 5.07235E-03    ( -0.000733229   0.000731887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.09 using 59 PHA bins.
# Reduced chi-squared =         0.8437 for     57 degrees of freedom 
# Null hypothesis probability =   7.936561e-01
 
Photon flux (15-150 keV)    in 3 sec: 1.03642 ( -0.0856047  0.0856442 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.54907e-07 ( -1.55137e-08  1.59959e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.94754     (     )
Epeak [keV] : 2.91899      (   )
Norm@50keV  : 1.26087E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.27 using 59 PHA bins.
# Reduced chi-squared =         0.8619 for     56 degrees of freedom 
# Null hypothesis probability =   7.590736e-01
 
Photon flux (15-150 keV)    in 3 sec: 1.02523 ( -0.097164  0.0938 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49984e-07 ( -2.24334e-08  2.02977e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.72463   ( 1.72718   1.72718 )
beta        : -2.75127    ( 2.75149   0.35541 )
Epeak [keV] : 9.67152      ( -9.51041 13.9712 )
Norm@50keV   : 1.93060E-02    ( -0.00886369   8994.85 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.37 using 59 PHA bins.
# Reduced chi-squared =         0.8613 for     55 degrees of freedom 
# Null hypothesis probability =   7.579296e-01
 
Photon flux (15-150 keV)    in 3 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)  = 5.17e-08
S(50-100 keV) = 3.50e-08

T90 vs. Hardness ratio plot

T90                                   = 3 sec.
Hardness ratio (energy fluence ratio) = 0.676983

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.693106
Count Ratio (50-100 keV) / (15-25 keV) = 0.178142

Mask shadow pattern

IMX = 1.762765355110585E-01, IMY = -1.379353324595018E-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:
-239.704000 -0.704000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6359  22.0094    0.4  34.3  -56.9   9.9819  31.7    0.3	Crab                          
 53.2480  -5.1179    2.3  46.7    4.5   1.9044   5.0 ------	UNKNOWN                       
 82.9727  -3.9722    3.0  54.5  -32.9   3.6210   3.9 ------	UNKNOWN                       
150.0692  68.7832    3.2  55.2 -145.4   4.0926   3.6 ------	UNKNOWN                       
 88.5889   4.2146    3.4  50.8  -44.5   3.4222   3.4 ------	UNKNOWN                       
 99.0382  29.4215    2.2  41.1  -80.2   4.2174   5.2 ------	UNKNOWN                       
 99.8681  30.9702    3.1  41.0  -82.8   2.9502   3.7 ------	UNKNOWN

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

Time interval of the image:
-0.704000 2.296000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.8159  22.1008    3.7  34.3  -57.2  -0.0962  -3.2   11.4	Crab                          
 10.9963  39.7749    2.3  29.4  108.7   0.1515   5.1 ------	UNKNOWN                       
 15.5612  46.7583    2.3  25.1  122.8   0.1249   5.1 ------	UNKNOWN                       
 47.5975   9.9705    2.6  31.6   13.4   0.1030   4.5 ------	UNKNOWN                       
 42.9286  30.2398    0.5  12.6   38.0   0.3936  22.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
43.196600 962.415200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6347  22.0115    0.4  37.2  -76.7  37.1990  29.7    0.2	Crab                          
 78.0247 -12.6319    3.1  54.6  -33.0   9.1803   3.8 ------	UNKNOWN                       
 90.7721  30.4964    3.4  40.9  -92.5   7.4441   3.4 ------	UNKNOWN

Plot creation:
Sun May 31 09:47:25 EDT 2015