batgrbproduct analysis for trigger=852553

batgrbproduct Analysis for Trigger=852553

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Fri Aug 10 09:12:32 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger852553/batgroup_hand_proc
======================================================================

  Trigger: 00852553      Segment: 000

  BAT Trigger Time: 555539349.504   [s; MET]
      Trigger Stop: 555539350.528   [s; MET]
               UTC: 2018-08-09T20:28:48.102240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 299.71241182161   Dec: -15.3020410499128  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.89
     Image Trigger?:     NO
     Rate S/N Ratio:     69.8140387028282  [ if not an image trigger ]
     Image S/N Ratio:    20.89

  Flight Position:   [ source = BAT ]
    RA: 299.71241182161   Dec: -15.3020410499128  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 299.711804743507   Dec: -15.2927685976229  [deg; J2000]  
        { 19h 58m 50.8s , -15d 17' 34.0" }
         +/- 0.56225299484388 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.133240301652705 [arcmin] (formal 1-sigma fit error)
    SNR: 69.2402612765424
 
  Angular difference between Flight and Ground position is 0.557455 arcmin
 
  Partial Coding Fraction: 0.6328125    [ including projection effects ]

  Duration
     T90: 233.243999958038 +/- 1.12445540263143
        Measured from: 3.62800002098083
                   to: 236.871999979019     [s; relative to TRIGTIME]
     T50: 37.595999956131 +/- 1.16756849842931
        Measured from: 20.1759999990463
                   to: 57.7719999551773     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 35.0960000753403     
                   to: 36.0960000753403     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -36.0799999237061     
                   to: 302.308000087738     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    23.428057  38.318789  35.257398  10.272070
           0.157600   0.172922   0.161166   0.122978 [error]
 Peak      0.594344   1.156054   1.204186   0.402962
           0.016147   0.021153   0.022643   0.016796 [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 7.46e-06 1.59e-05 2.67e-05 1.02e-04 7.33e-05 1.52e-04   erg/cm2
              Error 2.09e-07 2.70e-07 2.96e-07 2.60e-06 8.10e-07 2.60e-06   erg/cm2
Peak flux Power-law 5.97e+00 7.98e+00 7.83e+00 1.38e+01 2.63e+01 3.56e+01   ph/cm2/s
              Error 2.90e-01 2.32e-01 1.91e-01 7.47e-01 6.16e-01 8.71e-01   ph/cm2/s
 
Fluence   Cutoff-PL 7.03e-06 1.59e-05 2.72e-05 8.79e-05 7.31e-05 1.38e-04   erg/cm2
              Error 3.04e-07 2.76e-07 4.15e-07 6.96e-06 8.19e-07 6.94e-06   erg/cm2
Peak flux Cutoff-PL 5.57e+00 8.04e+00 8.06e+00 1.10e+01 2.60e+01 3.27e+01   ph/cm2/s
              Error 3.85e-01 2.41e-01 2.45e-01 1.70e+00 6.46e-01 1.84e+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    1.257    0.021    -      -           2.17e-02 2.76e-04   38.000 57
CPL   1.096    0.087     381.1  225.1      2.49e-02 1.80e-03   27.880 56
 
The chi2 of BB fit is Chi-Squared Chi-Squared 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    1.026    0.041    -      -           2.28e-01 5.20e-03   44.250 57
CPL   0.789    0.165     304.8  288.7      2.88e-01 4.57e-02   37.900 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: 230.784000 sec.
T50 in the 50-300 keV band: 29.824000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  338.388  -36.080  302.308
T90   233.244    3.628  236.872
T50    37.596   20.176   57.772
Peak    1.000   35.096   36.096

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  299.7118   -15.2928   0.0028    21.6894   100.2788        17.4390250     69.240 TRIG_00852553                 
 
Foreground time interval of the image:
-36.080  12.197 (delta_t =  48.277 [sec])
Background time interval of the image:
-239.504 -36.080 (delta_t = 203.424 [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  -36.080 sec. to  302.308 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25663     ( -0.0208173   0.0207258 )
Norm@50keV  : 2.16917E-02    ( -0.000275932   0.000275294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.00 using 59 PHA bins.
# Reduced chi-squared =         0.6667 for     57 degrees of freedom 
# Null hypothesis probability =   9.751678e-01
 
Photon flux (15-150 keV)    in 338.4 sec: 2.56833 ( -0.0377605  0.0378864 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.33353e-05 ( -8.09866e-07  8.09825e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from  -36.080 sec. to  302.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.09561     ( -0.0880442   0.0865068 )
Epeak [keV] : 381.147      ( -108.882 341.352 )
Norm@50keV  : 2.48598E-02    ( -0.00172664   0.00187822 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          27.88 using 59 PHA bins.
# Reduced chi-squared =         0.4978 for     56 degrees of freedom 
# Null hypothesis probability =   9.994047e-01
 
Photon flux (15-150 keV)    in 338.4 sec: 2.53057 ( -0.04202  0.04229 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.31384e-05 ( -8.19266e-07  8.18928e-07 ) ergs/cm2
 
Band function
Time interval is from  -36.080 sec. to  302.308 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.09561   ( -0.0377449   0.0242229 )
beta        : -10.00000    ( 10   20 )
Epeak [keV] : 381.095      ( -43.8882 341.308 )
Norm@50keV   : 2.48571E-02    ( -0.000273449   0.00187706 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          27.88 using 59 PHA bins.
# Reduced chi-squared =         0.5069 for     55 degrees of freedom 
# Null hypothesis probability =   9.991403e-01
 
Photon flux (15-150 keV)    in 338.4 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]    : 24.1527  (  )
R^2/D10^2   : 6.12471E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =        1395.03 using 59 PHA bins.
# Reduced chi-squared =        24.4742 for     57 degrees of freedom 
# Null hypothesis probability =  3.389708e-254
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.138e-06   5.516e-08
25- 50  1.192e-05   2.200e-07
50-150  5.176e-05   6.430e-07
15-150  6.581e-05   7.445e-07
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 11.7810       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         979.19 using 59 PHA bins.
# Reduced chi-squared =         17.179 for     57 degrees of freedom 
# Null hypothesis probability =  4.065964e-168
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.927e-06   1.303e-07
25- 50  1.910e-05   2.656e-07
50-150  4.188e-05   5.753e-07
15-150  7.090e-05   9.644e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.93295        (-0.445348      0.466032)
R1^2/D10^2  : 0.964059        (-0.150375      0.184183)
kT2 [keV]   : 35.3049        (-1.34128      1.52952)
R2^2/D10^2  : 1.47772E-02    (-0.00200307   0.00213379)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          33.52 using 59 PHA bins.
# Reduced chi-squared =         0.6094 for     55 degrees of freedom 
# Null hypothesis probability =   9.901924e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.926e-06   3.046e-07
25- 50  1.636e-05   3.773e-07
50-150  5.065e-05   7.783e-07
15-150  7.294e-05   1.015e-06

Peak spectrum fit

Power-law model
Time interval is from   35.096 sec. to   36.096 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.02587     ( -0.040914   0.0407828 )
Norm@50keV  : 0.228060    ( -0.0051982   0.00519373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.25 using 59 PHA bins.
# Reduced chi-squared =         0.7763 for     57 degrees of freedom 
# Null hypothesis probability =   8.912972e-01
 
Photon flux (15-150 keV)    in 1 sec: 26.2958 ( -0.615387  0.616291 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.4439e-06 ( -5.95174e-08  5.95957e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   35.096 sec. to   36.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.788634     ( -0.167783   0.161776 )
Epeak [keV] : 304.772      ( -100.718 476.609 )
Norm@50keV  : 0.287962    ( -0.0413892   0.050081 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.90 using 59 PHA bins.
# Reduced chi-squared =         0.6767 for     56 degrees of freedom 
# Null hypothesis probability =   9.696236e-01
 
Photon flux (15-150 keV)    in 1 sec: 25.9906 ( -0.6457  0.6466 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.42195e-06 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   35.096 sec. to   36.096 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.99996   ( -0.000120193   -4.99996 )
beta        : -1.06693    ( -0.0447516   0.0444881 )
Epeak [keV] : 29.2808      ( -5.44688 2.9359 )
Norm@50keV   : 6120.81    ( -136.765   14419.1 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.68 using 59 PHA bins.
# Reduced chi-squared =         0.7034 for     55 degrees of freedom 
# Null hypothesis probability =   9.533044e-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]    : 22.3297  (  )
R^2/D10^2   : 0.891568  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =         333.49 using 59 PHA bins.
# Reduced chi-squared =         5.8508 for     57 degrees of freedom 
# Null hypothesis probability =   1.019009e-40
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.171e-08   3.835e-09
25- 50  4.358e-07   1.375e-08
50-150  1.624e-06   5.950e-08
15-150  2.142e-06   5.850e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 108.862       (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         500.34 using 59 PHA bins.
# Reduced chi-squared =         8.7778 for     57 degrees of freedom 
# Null hypothesis probability =   3.949837e-72
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.711e-07   6.700e-09
25- 50  5.215e-07   1.245e-08
50-150  1.144e-06   2.950e-08
15-150  1.936e-06   5.100e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 9.46852        (-0.974234      1.0606)
R1^2/D10^2  : 7.23998        (-1.83651      2.69032)
kT2 [keV]   : 37.9786        (-3.76706      5.28898)
R2^2/D10^2  : 0.143352    (-0.0473566   0.0569875)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          35.52 using 59 PHA bins.
# Reduced chi-squared =         0.6457 for     55 degrees of freedom 
# Null hypothesis probability =   9.808722e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.571e-07   1.320e-08
25- 50  4.832e-07   2.705e-08
50-150  1.796e-06   1.445e-07
15-150  2.436e-06   1.405e-07
Plot creation:
Fri Aug 10 09:32:11 EDT 2018