batgrbproduct Analysis for Trigger=686761

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Thu May 19 12:16:32 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger686761/GCN5_download_cron
======================================================================

  Trigger: 00686761      Segment: 000

  BAT Trigger Time: 485255380.244   [s; MET]
      Trigger Stop: 485255380.26   [s; MET]
               UTC: 2016-05-18T09:09:23.958660    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 293.722461595314   Dec: 21.8910956484575  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    24.16
     Image Trigger?:     NO
     Rate S/N Ratio:     255.998046867549  [ if not an image trigger ]
     Image S/N Ratio:    24.16

  Flight Position:   [ source = BAT ]
    RA: 293.722461595314   Dec: 21.8910956484575  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 293.72753769189   Dec: 21.8914024205546  [deg; J2000]  
        { 19h 34m 54.6s , +21d 53' 29.0" }
         +/- 0.455095527860558 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.148013191766966 [arcmin] (formal 1-sigma fit error)
    SNR: 93.657655736819
 
  Angular difference between Flight and Ground position is 0.283203 arcmin
 
  Partial Coding Fraction: 0.984375    [ including projection effects ]

  Duration
     T90: 0.12799996137619 +/- 0.004
        Measured from: -0.0479999184608459
                   to: 0.0800000429153442     [s; relative to TRIGTIME]
     T50: 0.0679999589920044 +/- 0.004
        Measured from: -0.0199999213218689
                   to: 0.0480000376701355     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.486000001430511     
                   to: 0.513999998569489     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0720000267028809     
                   to: 0.0959999561309814     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.032181   2.162640   0.445415   0.008820
           0.021684   0.022189   0.010383   0.002215 [error]
 Peak      2.033533   2.166442   0.449657   0.007714
           0.022385   0.022852   0.011460   0.004706 [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 9.98e-07 6.48e-07 2.72e-07 1.57e-07 2.00e-06 2.07e-06   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law 3.09e+01 1.30e+01 3.24e+00 9.88e-01 4.77e+01 4.81e+01   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 6.00e-07 8.97e-07 3.29e-07 1.59e-08 1.84e-06 1.84e-06   erg/cm2
              Error 3.55e-08 2.15e-08 1.27e-08 2.98e-09 4.78e-08 4.79e-08   erg/cm2
Peak flux Cutoff-PL 1.94e+01 1.64e+01 3.33e+00 9.45e-02 3.93e+01 3.93e+01   ph/cm2/s
              Error 1.23e+00 4.09e-01 1.35e-01 2.07e-02 1.39e+00 1.39e+00   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    3.249    0.000    -      -           8.73e-01 0.00e+00 1114.720 57
CPL  -0.242    0.260      29.5    1.2      6.42e+01 2.11e+01   60.120 56
 
The chi2 of BB fit is 130.78 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    3.005    0.000    -      -           1.73e-01 0.00e+00  682.570 57
CPL  -0.165    0.290      29.4    1.3      9.71e+00 3.66e+00   59.990 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    0.168   -0.072    0.096
T90     0.128   -0.048    0.080
T50     0.068   -0.020    0.048
Peak    1.000   -0.486    0.514

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  293.7275 +21.8914 0.0021   12.0 -120.5       4.7825    93.7  TRIG_00686761       
------------------------------------------
 
Foreground time interval of the image:
 -0.072   0.096 (delta_t =   0.168 [sec])
Background time interval of the image:
-239.244  -0.072 (delta_t = 239.172 [sec])

Lightcurves

Notes:

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)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   -0.072 sec. to    0.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.24866     (     )
Norm@50keV  : 0.873192    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =        1114.72 using 59 PHA bins.
# Reduced chi-squared =        19.5565 for     57 degrees of freedom 
# Null hypothesis probability =  5.298077e-196
 
Photon flux (15-150 keV)    in 0.168 sec: 289.424 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99656e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.072 sec. to    0.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.241560     ( -0.266435   0.253222 )
Epeak [keV] : 29.5420      ( -1.28799 1.1803 )
Norm@50keV  : 64.2241    ( -17.1506   24.9553 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.12 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     56 degrees of freedom 
# Null hypothesis probability =   3.290575e-01
 
Photon flux (15-150 keV)    in 0.168 sec: 232.329 ( -8.019  8.103 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.84187e-06 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   -0.072 sec. to    0.096 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.237143   ( -0.239013   0.281906 )
beta        : -10.0000    ( 10   10 )
Epeak [keV] : 29.5151      ( -1.2685 1.20242 )
Norm@50keV   : 63.9143    ( -16.7599   25.5357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          60.12 using 59 PHA bins.
# Reduced chi-squared =          1.093 for     55 degrees of freedom 
# Null hypothesis probability =   2.955675e-01
 
Photon flux (15-150 keV)    in 0.168 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]    : 8.65223  (  )
R^2/D10^2   : 194.090  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         130.78 using 59 PHA bins.
# Reduced chi-squared =         2.2943 for     57 degrees of freedom 
# Null hypothesis probability =   9.984940e-08
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.650e-07   1.806e-08
25- 50  9.283e-07   2.134e-08
50-150  3.134e-07   1.294e-08
15-150  1.707e-06   3.830e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 25.3858       (      )
Norm        : 2583.22       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         205.77 using 59 PHA bins.
# Reduced chi-squared =         3.6101 for     57 degrees of freedom 
# Null hypothesis probability =   1.074447e-18
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.027e-07   2.495e-08
25- 50  8.308e-07   1.831e-08
50-150  3.613e-07   1.386e-08
15-150  1.995e-06   4.368e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.09721        (-0.852644      0.812092)
R1^2/D10^2  : 477.039        (-127.055      255.022)
kT2 [keV]   : 10.6720        (-0.75452      1.18042)
R2^2/D10^2  : 44.7650    (-25.4812   32.9941)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.95 using 59 PHA bins.
# Reduced chi-squared =          1.054 for     55 degrees of freedom 
# Null hypothesis probability =   3.670847e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.828e-07   5.947e-08
25- 50  9.013e-07   7.896e-08
50-150  3.444e-07   4.964e-08
15-150  1.829e-06   1.695e-07

Peak spectrum fit

Power-law model
Time interval is from   -0.486 sec. to    0.514 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.00450     (     )
Norm@50keV  : 0.172940    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         682.57 using 59 PHA bins.
# Reduced chi-squared =         11.975 for     57 degrees of freedom 
# Null hypothesis probability =  5.262400e-108
 
Photon flux (15-150 keV)    in 1 sec: 47.7171 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.08222e-06 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.486 sec. to    0.514 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.165448     ( -0.296652   0.282391 )
Epeak [keV] : 29.3748      ( -1.40573 1.25808 )
Norm@50keV  : 9.71383    ( -2.9075   4.41524 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.99 using 59 PHA bins.
# Reduced chi-squared =          1.071 for     56 degrees of freedom 
# Null hypothesis probability =   3.330984e-01
 
Photon flux (15-150 keV)    in 1 sec: 39.2562 ( -1.3826  1.3971 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85301e-06 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   -0.486 sec. to    0.514 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 0.434609   ( -0.420301   0.329406 )
beta        : -5.41709    ( -1.05985   0.452095 )
Epeak [keV] : 30.0230      ( -1.46127 0.901632 )
Norm@50keV   : 13.9860    ( -5.07049   7.74099 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.75 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     55 degrees of freedom 
# Null hypothesis probability =   4.462507e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.85418e-06 ( 0  0 ) ergs/cm2
 
Single BB
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 8.58626  (  )
R^2/D10^2   : 33.8319  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         123.70 using 59 PHA bins.
# Reduced chi-squared =         2.1702 for     57 degrees of freedom 
# Null hypothesis probability =   7.735324e-07
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.730e-07   1.920e-08
25- 50  9.325e-07   2.185e-08
50-150  3.074e-07   1.350e-08
15-150  1.713e-06   3.950e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 26.9234       (      )
Norm        : 404.330       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         159.37 using 59 PHA bins.
# Reduced chi-squared =         2.7960 for     57 degrees of freedom 
# Null hypothesis probability =   1.264511e-11
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.753e-07   2.735e-08
25- 50  8.322e-07   2.005e-08
50-150  3.935e-07   1.690e-08
15-150  2.001e-06   4.250e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.46117        (-0.98398      0.849981)
R1^2/D10^2  : 73.5394        (-18.4371      37.6015)
kT2 [keV]   : 11.4407        (-1.28458      2.52588)
R2^2/D10^2  : 4.63522    (-3.52225   6.47288)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.76 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     55 degrees of freedom 
# Null hypothesis probability =   4.093440e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.780e-07   5.575e-08
25- 50  9.046e-07   9.705e-08
50-150  3.533e-07   9.865e-08
15-150  1.836e-06   2.340e-07
Plot creation:
Thu May 19 12:21:15 EDT 2016