batgrbproduct analysis for trigger=985320

batgrbproduct Analysis for Trigger=985320

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.47
    Process Start Time (local time): Sun Aug  2 17:58:15 EDT 2020
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger985320/GCN5_download_cron
======================================================================

  Trigger: 00985320      Segment: 000

  BAT Trigger Time: 618005533.008   [s; MET]
      Trigger Stop: 618005533.024   [s; MET]
               UTC: 2020-08-01T20:11:47.622340    [includes UTCF correction] 
       Where From?: (*SHORT BURST*) TDRSS scaled map message

  BAT 
    RA: 281.630174702872   Dec: -2.9903966858513  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.6
     Image Trigger?:     NO
     Rate S/N Ratio:     44.4184646290256  [ if not an image trigger ]
     Image S/N Ratio:    10.6

  Flight Position:   [ source = BAT ]
    RA: 281.630174702872   Dec: -2.9903966858513  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 281.633175783828   Dec: -3.00581774901665  [deg; J2000]  
        { 18h 46m 32.0s , -03d 00' 20.9" }
         +/- 1.960614997596 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.912864175029317 [arcmin] (formal 1-sigma fit error)
    SNR: 11.6255916726083
 
  Angular difference between Flight and Ground position is 0.942575 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.0119999647140503 +/- 0.0056569500071322
        Measured from: 1.19209289550781e-07
                   to: 0.0120000839233398     [s; relative to TRIGTIME]
     T50: 0.00799989700317383 +/- 0.004
        Measured from: 1.19209289550781e-07
                   to: 0.00800001621246338     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.491999983787537     
                   to: 0.508000016212463     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 0.0119999647140503     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.019676   0.015343   0.007301   0.000082
           0.002665   0.002548   0.001912   0.000751 [error]
 Peak      0.034714   0.024515   0.012233  -0.001030
           0.008150   0.007787   0.006525   0.005505 [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 5.49e-09 4.01e-09 1.94e-09 1.33e-09 1.21e-08 1.28e-08   erg/cm2
              Error 1.08e-09 8.22e-10 6.48e-10 7.37e-10 2.35e-09 2.64e-09   erg/cm2
Peak flux Power-law 3.83e-01 1.66e-01 4.31e-02 1.38e-02 6.01e-01 6.06e-01   ph/cm2/s
              Error 1.20e-01 7.00e-02 3.80e-02 2.46e-02 1.76e-01 1.80e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.59e-09 6.38e-09 1.51e-09 3.73e-11 1.35e-08 1.35e-08   erg/cm2
              Error 1.27e-09 1.73e-09 1.51e-09 2.20e-10 3.20e-09 3.20e-09   erg/cm2
Peak flux Cutoff-PL 3.83e-01 1.66e-01 4.30e-02 1.36e-02 5.99e-01 6.06e-01   ph/cm2/s
              Error 1.20e-01 8.40e-02 4.42e-02 2.45e-02 1.89e-01 1.89e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band 3.89e-01 1.74e-01 4.51e-02 1.30e-02 6.16e-01 6.23e-01   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    3.047    0.283    -      -           8.19e-02 2.21e-02   50.580 57
CPL  -2.012    0.000      24.8    0.0      2.45e+02 0.00e+00   39.210 56
 
The chi2 of BB fit is 39.29 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    2.948    0.846    -      -           2.27e-03 1.54e-03   58.190 57
CPL  -4.552    0.000      22.2    0.0      9.46e+02 0.00e+00   57.340 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    0.012    0.000    0.012
T90     0.012    0.000    0.012
T50     0.008    0.000    0.008
Peak    1.000   -0.492    0.508

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  281.6332  -3.0058 0.0165    1.0  149.6       0.0462    11.6  TRIG_00985320       
------------------------------------------
 
Foreground time interval of the image:
  0.000   0.012 (delta_t =   0.012 [sec])
Background time interval of the image:
-239.008   0.000 (delta_t = 239.008 [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    0.000 sec. to    0.012 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 3.04703     ( -0.25468   0.311982 )
Norm@50keV  : 8.18815E-02    ( -0.0224478   0.021709 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.58 using 59 PHA bins.
# Reduced chi-squared =         0.8874 for     57 degrees of freedom 
# Null hypothesis probability =   7.129220e-01
 
Photon flux (15-150 keV)    in 0.012 sec: 23.3058 ( -4.27469  4.27467 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.20689e-08 ( -2.35147e-09  2.35354e-09 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.000 sec. to    0.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.01170     (     )
Epeak [keV] : 24.7987      (   )
Norm@50keV  : 245.316    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.21 using 59 PHA bins.
# Reduced chi-squared =         0.7002 for     56 degrees of freedom 
# Null hypothesis probability =   9.568652e-01
 
Photon flux (15-150 keV)    in 0.012 sec: 26.2824 25.8186 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.18213e-12 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from    0.000 sec. to    0.012 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.62770   ( -5.17427   -4.6277 )
beta        : -4.24117    ( -4.25842   0.734405 )
Epeak [keV] : 24.7338      ( -2.99065 3.0794 )
Norm@50keV   : 2.31900E+04    ( -3926   105632 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          36.67 using 59 PHA bins.
# Reduced chi-squared =         0.6667 for     55 degrees of freedom 
# Null hypothesis probability =   9.729331e-01
 
Photon flux (15-150 keV)    in 0.012 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]    : 6.31398  (-0.909099  1.07721)
R^2/D10^2   : 83.6612  (-41.4833   79.3087)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.29 using 59 PHA bins.
# Reduced chi-squared =         0.6894 for     57 degrees of freedom 
# Null hypothesis probability =   9.645103e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.702e-09   1.590e-09
25- 50  6.341e-09   1.760e-09
50-150  7.125e-10   4.388e-10
15-150  1.276e-08   3.821e-09
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 24.1950       (-5.96461      6.5279)
Norm        : 264.367       (-70.9752     104.588)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.51 using 59 PHA bins.
# Reduced chi-squared =         0.7106 for     57 degrees of freedom 
# Null hypothesis probability =   9.516660e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.685e-09   1.157e-09
25- 50  5.705e-09   1.280e-09
50-150  2.311e-09   1.163e-09
15-150  1.370e-08   3.194e-09
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.78357        (-5.7865      1.30787)
R1^2/D10^2  : 108.679        (-59.1633      194.286)
kT2 [keV]   : 14.0751        (-14.0873      -14.0873)
R2^2/D10^2  : 0.585945    (-0.582548   3.69912)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          37.20 using 59 PHA bins.
# Reduced chi-squared =         0.6764 for     55 degrees of freedom 
# Null hypothesis probability =   9.685387e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.782e-09   3.318e-09
25- 50  6.146e-09   3.658e-09
50-150  1.835e-09   1.094e-09
15-150  1.376e-08   7.620e-09

Peak spectrum fit

Power-law model
Time interval is from   -0.492 sec. to    0.508 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.94814     ( -0.700004   0.991315 )
Norm@50keV  : 2.26732E-03    ( -0.00141812   0.00166058 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.19 using 59 PHA bins.
# Reduced chi-squared =          1.021 for     57 degrees of freedom 
# Null hypothesis probability =   4.311902e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.600594 ( -0.175166  0.176481 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.66122e-08 ( -9.98115e-09  1.1745e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   -0.492 sec. to    0.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -4.55193     (     )
Epeak [keV] : 22.1872      (   )
Norm@50keV  : 945.873    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.34 using 59 PHA bins.
# Reduced chi-squared =          1.024 for     56 degrees of freedom 
# Null hypothesis probability =   4.250651e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.599192 0.565988 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.5253e-16 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   -0.492 sec. to    0.508 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.46637   ( -0.532884   1.46637 )
beta        : -2.94822    ( -0.992528   0.700167 )
Epeak [keV] : 0.698516      ( -0.698501 9999.27 )
Norm@50keV   : 1.23107    ( -1.23107   5.79772e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.19 using 59 PHA bins.
# Reduced chi-squared =          1.058 for     55 degrees of freedom 
# Null hypothesis probability =   3.586549e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.616150 (    ) 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]    : 5.15099  (-1.21744  1.48895)
R^2/D10^2   : 4.45579  (-4.45558   11.2968)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.43 using 59 PHA bins.
# Reduced chi-squared =          1.008 for     57 degrees of freedom 
# Null hypothesis probability =   4.589466e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.219e-08   6.985e-09
25- 50  8.560e-09   5.530e-09
50-150  4.012e-10   4.052e-10
15-150  2.115e-08   1.284e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 16.3620       (-7.44455      18.6869)
Norm        : 9.30017       (-5.27623     14.2374)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.12 using 59 PHA bins.
# Reduced chi-squared =          1.020 for     57 degrees of freedom 
# Null hypothesis probability =   4.338265e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.191e-08   6.683e-09
25- 50  8.812e-09   5.750e-09
50-150  1.842e-09   1.785e-09
15-150  2.256e-08   1.438e-08
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 4.87209        (-1.31134      1.48695)
R1^2/D10^2  : 5.45837        (-5.45676      18.1318)
kT2 [keV]   : 30.8360        (-31.2254      -31.2254)
R2^2/D10^2  : 1.48819E-03    (-0.00147446   -0.00147446)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.16 using 59 PHA bins.
# Reduced chi-squared =          1.021 for     55 degrees of freedom 
# Null hypothesis probability =   4.312169e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.217e-08   6.985e-09
25- 50  8.677e-09   5.090e-09
50-150  9.278e-09   7.175e-09
15-150  3.013e-08   1.560e-08
Plot creation:
Sun Aug  2 18:04:16 EDT 2020