batgrbproduct analysis for trigger=813772

batgrbproduct Analysis for Trigger=813772

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Tue Mar 13 01:58:28 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/prebascript/trigger813772/GCN5_download_cron
======================================================================

  Trigger: 00813772      Segment: 000

  BAT Trigger Time: 542508616   [s; MET]
      Trigger Stop: 542508680   [s; MET]
               UTC: 2018-03-12T00:49:55.390580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 275.099800193325   Dec: 7.1762644238348  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    8.87
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.87

  Flight Position:   [ source = BAT ]
    RA: 275.099800193325   Dec: 7.1762644238348  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 275.101785457558   Dec: 7.15077208078532  [deg; J2000]  
        { 18h 20m 24.4s , +07d 09' 02.8" }
         +/- 2.59909161215046 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.68763647980959 [arcmin] (formal 1-sigma fit error)
    SNR: 7.77170150467825
 
  Angular difference between Flight and Ground position is 1.534100 arcmin
 
  Partial Coding Fraction: 1    [ including projection effects ]

  Duration
     T90: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]
     T50: 64 +/- 
        Measured from: 0
                   to: 64     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

  Fluence
     Peak Flux  (peak 64 second)
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0     
                   to: 64     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.342682   0.308586   0.148902   0.069040
           0.057779   0.054457   0.046073   0.039995 [error]
 Peak      0.342682   0.308586   0.148902   0.069040
           0.057779   0.054457   0.046073   0.039995 [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 -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.491    2.152      35.4    0.0      6.71e-03 0.00e+00   75.930 56
 
The chi2 of BB fit is 77.83 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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.491    2.152      35.4    0.0      6.71e-03 0.00e+00   75.930 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   64.000    0.000   64.000
T90    64.000    0.000   64.000
T50    64.000    0.000   64.000
Peak   64.000    0.000   64.000

Image

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

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  275.1018  +7.1508 0.0250    0.1  -74.9       0.8693     7.8  TRIG_00813772       
------------------------------------------
 
Foreground time interval of the image:
  0.000  56.000 (delta_t =  56.000 [sec])
 57.000  64.000 (delta_t =   7.000 [sec])
Background time interval of the image:

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
Multiple GTIs in the spectrum
tstart tstop
0.000000 56.000000
57.000000 64.000000
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index:      (     )
Norm@50keV  :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 63 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 56.000000
57.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.491012     ( -2.65616   1.64688 )
Epeak [keV] : 35.3521      (   )
Norm@50keV  : 6.71167E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.93 using 59 PHA bins.
# Reduced chi-squared =          1.356 for     56 degrees of freedom 
# Null hypothesis probability =   3.931316e-02
 
Photon flux (15-150 keV)    in 63 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 56.000000
57.000000 64.000000
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 63 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]    : 8.77649  (-1.57496  1.91376)
R^2/D10^2   : 8.64159E-02  (-0.0467747   0.101389)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.83 using 59 PHA bins.
# Reduced chi-squared =          1.366 for     57 degrees of freedom 
# Null hypothesis probability =   3.476985e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.055e-08   2.585e-08
25- 50  1.645e-07   5.078e-08
50-150  5.808e-08   2.875e-08
15-150  3.031e-07   8.710e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 55.5906       (-22.2135      53.608)
Norm        : 0.599439       (-0.164881     0.231042)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.31 using 59 PHA bins.
# Reduced chi-squared =          1.339 for     57 degrees of freedom 
# Null hypothesis probability =   4.473276e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.364e-08   2.441e-08
25- 50  1.391e-07   3.865e-08
50-150  1.483e-07   7.846e-08
15-150  3.811e-07   1.244e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.93353        (-2.61678      1.81821)
R1^2/D10^2  : 0.121178        (-0.0655049      0.300788)
kT2 [keV]   : 199.352        (-199.363      -199.363)
R2^2/D10^2  : 8.10136E-06    (-6.40439e-06   6.21896e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.68 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     55 degrees of freedom 
# Null hypothesis probability =   4.710020e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.700e-08   4.099e-08
25- 50  1.545e-07   6.616e-08
50-150  1.732e-07   3.253e-08
15-150  4.147e-07   1.323e-07

Peak spectrum fit

Power-law model
Time interval is from   57.000 sec. to   64.000 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index:      (     )
Norm@50keV  :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 63 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   57.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.491012     ( -2.65616   1.64689 )
Epeak [keV] : 35.3521      (   )
Norm@50keV  : 6.71167E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.93 using 59 PHA bins.
# Reduced chi-squared =          1.356 for     56 degrees of freedom 
# Null hypothesis probability =   3.931316e-02
 
Photon flux (15-150 keV)    in 63 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 
Band function
Time interval is from   57.000 sec. to   64.000 sec.
XSPEC12>exit
 XSPEC: quit
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in 63 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]    : 8.77649  (-1.57496  1.91376)
R^2/D10^2   : 8.64159E-02  (-0.0467747   0.101389)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          77.83 using 59 PHA bins.
# Reduced chi-squared =          1.366 for     57 degrees of freedom 
# Null hypothesis probability =   3.476985e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.055e-08   2.776e-08
25- 50  1.645e-07   4.864e-08
50-150  5.808e-08   2.861e-08
15-150  3.031e-07   9.403e-08
Thermal bremsstrahlung (OTTB)
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 55.5906       (-22.2135      53.608)
Norm        : 0.599439       (-0.164881     0.231042)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.31 using 59 PHA bins.
# Reduced chi-squared =          1.339 for     57 degrees of freedom 
# Null hypothesis probability =   4.473276e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.364e-08   2.483e-08
25- 50  1.391e-07   3.856e-08
50-150  1.483e-07   8.271e-08
15-150  3.811e-07   1.231e-07
Double BB
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.93353        (-2.61678      1.81821)
R1^2/D10^2  : 0.121178        (-0.0655049      0.300788)
kT2 [keV]   : 199.352        (-199.363      -199.363)
R2^2/D10^2  : 8.10136E-06    (-6.40439e-06   6.21896e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.68 using 59 PHA bins.
# Reduced chi-squared =          1.340 for     55 degrees of freedom 
# Null hypothesis probability =   4.710020e-02
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.700e-08   3.432e-08
25- 50  1.545e-07   7.020e-08
50-150  1.732e-07   3.737e-08
15-150  4.147e-07   1.351e-07
Plot creation:
Tue Mar 13 02:06:26 EDT 2018