batgrbproduct analysis for trigger=310613

batgrbproduct Analysis for Trigger=310613

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 02:32:30 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger310613
======================================================================

  Trigger: 00310613      Segment: 000

  BAT Trigger Time: 231277984.832   [s; MET]
      Trigger Stop: 231277985.344   [s; MET]
               UTC: 2008-04-30T19:53:02.075640    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 165.322321743452   Dec: 51.6894257321077  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.83
     Image Trigger?:     NO
     Rate S/N Ratio:     19.3390796058137  [ if not an image trigger ]
     Image S/N Ratio:    10.83

  Flight Position:   [ source = BAT ]
    RA: 165.322321743452   Dec: 51.6894257321077  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 165.328643441155   Dec: 51.6815222003603  [deg; J2000]  
        { 11h 01m 18.9s , +51d 40' 53.5" }
         +/- 0.694349954333688 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.2616031070918 [arcmin] (formal 1-sigma fit error)
    SNR: 51.2194529072589
 
  Angular difference between Flight and Ground position is 0.529317 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 13.8720000088215 +/- 1.89973156912445
        Measured from: 0.376000016927719
                   to: 14.2480000257492     [s; relative to TRIGTIME]
     T50: 4.87999999523163 +/- 0.350907413302386
        Measured from: 1.75600001215935
                   to: 6.63600000739098     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.70400002598763     
                   to: 2.70400002598763     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.299999982118607     
                   to: 17.3640000224113     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.733599   0.808894   0.498701   0.112318
           0.022375   0.023641   0.021848   0.021681 [error]
 Peak      0.115149   0.123691   0.080592   0.019099
           0.006226   0.006588   0.006057   0.005466 [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 2.01e-07 3.21e-07 3.86e-07 9.07e-07 1.17e-06 1.82e-06   erg/cm2
              Error 1.40e-08 1.24e-08 2.23e-08 1.17e-07 5.01e-08 1.32e-07   erg/cm2
Peak flux Power-law 1.03e+00 8.95e-01 5.32e-01 4.75e-01 2.66e+00 2.93e+00   ph/cm2/s
              Error 1.03e-01 5.48e-02 5.02e-02 9.07e-02 1.62e-01 1.80e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.02e-07 3.21e-07 3.86e-07 8.98e-07 1.17e-06 1.81e-06   erg/cm2
              Error 1.39e-08 1.20e-08 2.23e-08 1.41e-07 4.90e-08 1.79e-07   erg/cm2
Peak flux Cutoff-PL 1.02e+00 9.05e-01 5.33e-01 4.07e-01 2.65e+00 2.86e+00   ph/cm2/s
              Error 1.19e-01 6.53e-02 5.12e-02 1.76e-01 1.75e-01 2.59e-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    1.734    0.079    -      -           7.17e-03 2.91e-04   57.560 57
CPL   2.088    0.080      35.7   -0.0      4.87e-03 0.00e+00   55.980 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.751    0.119    -      -           1.97e-02 1.37e-03   61.110 57
CPL   1.646    0.445     152.2    0.0      2.25e-02 0.00e+00   60.960 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: 11.904000 sec.
T50 in the 50-300 keV band: 4.864000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   17.664   -0.300   17.364
T90    13.872    0.376   14.248
T50     4.880    1.756    6.636
Peak    1.000    1.704    2.704

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
  165.3286    51.6815   0.0038     7.6922    34.6929         1.9437808     51.219 TRIG_00310613                 
 
Foreground time interval of the image:
 -0.300  10.069 (delta_t =  10.369 [sec])
Background time interval of the image:
-194.331  -0.300 (delta_t = 194.031 [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 0.512000

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 0.512000

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 0.512000

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   -0.300 sec. to   17.364 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.73364     ( -0.0790812   0.0798218 )
Norm@50keV  : 7.17119E-03    ( -0.000291497   0.000289762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.010 for     57 degrees of freedom 
# Null hypothesis probability =   4.543034e-01
 
Photon flux (15-150 keV)    in 17.66 sec: 0.963883 ( -0.0379033  0.0380626 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16975e-06 ( -4.98625e-08  5.02376e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.300 sec. to   17.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.08796     ( -0.0807594   0.0788958 )
Epeak [keV] : 35.7224      ( -9999.35 -9999.36 )
Norm@50keV  : 4.86781E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.98 using 59 PHA bins.
# Reduced chi-squared =         0.9997 for     56 degrees of freedom 
# Null hypothesis probability =   4.755484e-01
 
Photon flux (15-150 keV)    in 17.66 sec: 0.964665 ( -0.039376  0.036925 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16918e-06 ( -4.94674e-08  4.84838e-08 ) ergs/cm2

Band function

Time interval is from   -0.300 sec. to   17.364 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.34729   ( 1.34729   1.34729 )
beta        : -1.73408    ( -1.76239   0.0794738 )
Epeak [keV] : 30.2102      ( -30.2102 -30.2102 )
Norm@50keV   : 1.57076E-02    ( -0.00882391   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.56 using 59 PHA bins.
# Reduced chi-squared =          1.047 for     55 degrees of freedom 
# Null hypothesis probability =   3.807283e-01
 
Photon flux (15-150 keV)    in 17.66 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]    : 12.5948  (  )
R^2/D10^2   : 0.181004  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         238.95 using 59 PHA bins.
# Reduced chi-squared =         4.1921 for     57 degrees of freedom 
# Null hypothesis probability =   3.901037e-24
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.075e-07   7.753e-09
25- 50  3.577e-07   1.634e-08
50-150  3.519e-07   3.249e-08
15-150  8.171e-07   3.815e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 135.157       (-26.6438      30.3429)
Norm        : 3.91471       (-0.186785     0.246614)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.51 using 59 PHA bins.
# Reduced chi-squared =          1.202 for     57 degrees of freedom 
# Null hypothesis probability =   1.412658e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.789e-07   1.207e-08
25- 50  3.265e-07   2.172e-08
50-150  6.162e-07   1.627e-07
15-150  1.122e-06   1.891e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.90986        (-0.791909      0.822954)
R1^2/D10^2  : 1.24245        (-0.406458      0.700503)
kT2 [keV]   : 29.2836        (-4.73383      7.13238)
R2^2/D10^2  : 7.11472E-03    (-0.00354483   0.00593173)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.85 using 59 PHA bins.
# Reduced chi-squared =          1.143 for     55 degrees of freedom 
# Null hypothesis probability =   2.180732e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.831e-07   1.880e-08
25- 50  3.261e-07   2.834e-08
50-150  6.736e-07   1.194e-07
15-150  1.183e-06   1.506e-07

Peak spectrum fit

Power-law model

Time interval is from    1.704 sec. to    2.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75064     ( -0.118049   0.120563 )
Norm@50keV  : 1.96948E-02    ( -0.0013827   0.00136539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.11 using 59 PHA bins.
# Reduced chi-squared =          1.072 for     57 degrees of freedom 
# Null hypothesis probability =   3.305504e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.66369 ( -0.16242  0.162566 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81725e-07 ( -1.32397e-08  1.34197e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.704 sec. to    2.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64567     ( -0.48933   0.400176 )
Epeak [keV] : 152.196      (   )
Norm@50keV  : 2.24647E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.96 using 59 PHA bins.
# Reduced chi-squared =          1.089 for     56 degrees of freedom 
# Null hypothesis probability =   3.022786e-01
 
Photon flux (15-150 keV)    in 1 sec: 2.64707 ( -0.17666  0.17255 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.79531e-07 ( -1.6378e-08  1.5141e-08 ) ergs/cm2

Band function

Time interval is from    1.704 sec. to    2.704 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -0.842172   ( 1.14821   6.14126 )
beta        : -1.81263    ( 1.80896   0.159796 )
Epeak [keV] : 36.9211      ( -36.9448 161.039 )
Norm@50keV   : 8.32722E-02    ( -0.0856675   2362.9 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.35 using 59 PHA bins.
# Reduced chi-squared =          1.097 for     55 degrees of freedom 
# Null hypothesis probability =   2.887102e-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]    : 11.6846  (  )
R^2/D10^2   : 0.682427  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         122.47 using 59 PHA bins.
# Reduced chi-squared =         2.1485 for     57 degrees of freedom 
# Null hypothesis probability =   1.095843e-06
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.965e-08   2.170e-09
25- 50  5.992e-08   4.505e-09
50-150  4.830e-08   8.180e-09
15-150  1.279e-07   9.850e-09

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 119.205       (-31.0382      41.6092)
Norm        : 11.1393       (-0.85242     1.14485)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.56 using 59 PHA bins.
# Reduced chi-squared =          1.098 for     57 degrees of freedom 
# Null hypothesis probability =   2.854349e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.902e-08   2.660e-09
25- 50  5.186e-08   4.290e-09
50-150  9.225e-08   3.123e-08
15-150  1.731e-07   3.660e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.10775        (-1.16319      1.35252)
R1^2/D10^2  : 5.15101        (-2.5337      6.08443)
kT2 [keV]   : 22.6668        (-4.53172      8.6351)
R2^2/D10^2  : 4.67650E-02    (-0.0319616   0.0630681)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.01 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     55 degrees of freedom 
# Null hypothesis probability =   2.140039e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.057e-08   6.600e-09
25- 50  5.073e-08   1.042e-08
50-150  9.325e-08   3.718e-08
15-150  1.746e-07   3.855e-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: 1.72710     ( -0.071988   0.0725839 )
Norm@50keV  : 1.08206E-02    ( -0.000400838   0.000398971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.95 using 59 PHA bins.
# Reduced chi-squared =         0.9991 for     57 degrees of freedom 
# Null hypothesis probability =   4.769219e-01
 
Photon flux (15-150 keV)    in 10.37 sec: 1.45097 ( -0.0530318  0.0532632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03688e-06 ( -4.02962e-08  4.05461e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72877     ( -0.0744451   0.071179 )
Epeak [keV] : 9999.36      ( -9999.35 -9999.36 )
Norm@50keV  : 1.08078E-02    ( -0.00164089   0.00317755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.97 using 59 PHA bins.
# Reduced chi-squared =          1.017 for     56 degrees of freedom 
# Null hypothesis probability =   4.386709e-01
 
Photon flux (15-150 keV)    in 10.37 sec: 1.45101 ( -0.02856  0.05239 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.03169e-06 ( -4.24807e-08  4.69097e-08 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.25537   ( 1.25514   1.25514 )
beta        : -1.74390    ( 1.7439   0.0853197 )
Epeak [keV] : 44.6751      ( -44.6501 -44.6501 )
Norm@50keV   : 2.29450E-02    ( -0.0125293   0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.70 using 59 PHA bins.
# Reduced chi-squared =          1.031 for     55 degrees of freedom 
# Null hypothesis probability =   4.114647e-01
 
Photon flux (15-150 keV)    in 10.37 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)  = 3.21e-07
S(50-100 keV) = 3.86e-07

T90 vs. Hardness ratio plot

T90                                   = 13.8720000088215 sec.
Hardness ratio (energy fluence ratio) = 1.20249

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.10264
Count Ratio (50-100 keV) / (15-25 keV) = 0.679801

Mask shadow pattern

IMX = 1.110536330879647E-01, IMY = -7.687688889994855E-02

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-194.331400 -0.300000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
192.7980  24.0656    2.8  39.6   81.3   2.8873   4.2 ------	UNKNOWN                       
192.8996  24.4278    3.0  39.4   80.8   2.9385   4.4 ------	UNKNOWN                       
126.2109  -2.3063    3.4  56.9  179.3   3.3521   3.4 ------	UNKNOWN                       
247.3321  79.9897    2.0  42.2  -19.2   1.4684   5.8 ------	UNKNOWN                       
312.0798  80.7695    2.6  49.2  -29.7   1.8053   4.5 ------	UNKNOWN                       
 79.3441  61.7435    3.4  41.2  -77.9   2.5158   3.4 ------	UNKNOWN

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

Time interval of the image:
-0.300000 10.068600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
165.3286  51.6815    0.2   7.7   34.7   1.9438  51.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
37.468600 962.170500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
134.6232   0.9533    5.1  56.9  179.1   6.8024   2.3 ------	UNKNOWN                       
286.6951  61.6084    3.0  57.5   -9.6  10.1525   3.9 ------	UNKNOWN                       
 84.3418  64.9733    4.2  41.2  -77.8   6.5885   2.8 ------	UNKNOWN                       
106.4976  25.7306    3.9  51.0 -135.6   9.2966   2.9 ------	UNKNOWN

Plot creation:
Sun May 31 07:43:54 EDT 2015