batgrbproduct analysis for trigger=841548

batgrbproduct Analysis for Trigger=841548

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): Fri Jul  6 12:14:06 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger841548
======================================================================

  Trigger: 00841548      Segment: 000

  BAT Trigger Time: 550696594.752   [s; MET]
      Trigger Stop: 550696595.776   [s; MET]
               UTC: 2018-06-14T19:16:13.646380    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 3.15726986515184   Dec: 46.9428648506083  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.68
     Image Trigger?:     NO
     Rate S/N Ratio:     11.7898261225516  [ if not an image trigger ]
     Image S/N Ratio:    6.68

  Flight Position:   [ source = BAT ]
    RA: 3.15726986515184   Dec: 46.9428648506083  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 3.07393951220496   Dec: 46.9675282230226  [deg; J2000]  
        { 00h 12m 17.7s , +46d 58' 03.1" }
         +/- 1.84131278993619 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.703858984219927 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7164154727742
 
  Angular difference between Flight and Ground position is 3.719748 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 7.0919998884201 +/- 0.941148188501542
        Measured from: -3.9559999704361
                   to: 3.13599991798401     [s; relative to TRIGTIME]
     T50: 3.567999958992 +/- 1.06300895367581
        Measured from: -1.87999999523163
                   to: 1.68799996376038     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.56400001049042     
                   to: 2.56400001049042     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.34799993038177     
                   to: 3.45200002193451     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.123056   0.117222   0.089059   0.036483
           0.015168   0.015447   0.013472   0.011281 [error]
 Peak      0.021967   0.028241   0.033065   0.005182
           0.005514   0.005688   0.005156   0.004073 [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 2.94e-08 5.29e-08 7.31e-08 2.10e-07 2.11e-07 3.65e-07   erg/cm2
              Error 6.68e-09 6.96e-09 1.37e-08 8.79e-08 3.20e-08 9.80e-08   erg/cm2
Peak flux Power-law 1.84e-01 2.15e-01 1.81e-01 2.57e-01 6.72e-01 8.37e-01   ph/cm2/s
              Error 6.16e-02 4.51e-02 3.98e-02 1.17e-01 1.28e-01 1.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.68e-08 3.77e-08 4.11e-08 1.03e-07 1.33e-07 2.09e-07   erg/cm2
              Error 7.82e-09 1.00e-08 8.49e-09 2.66e-08 2.98e-08 5.79e-08   erg/cm2
Peak flux Cutoff-PL 1.34e-01 2.36e-01 2.03e-01 8.05e-02 6.32e-01 6.54e-01   ph/cm2/s
              Error 1.09e-01 5.51e-02 5.05e-02 9.16e-02 1.39e-01 1.96e-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    1.534    0.254    -      -           2.86e-03 3.87e-04   66.220 57
CPL   1.533    0.256    10000.0    0.0      2.87e-03 0.00e+00   66.240 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.250    0.312    -      -           5.68e-03 1.06e-03   57.820 57
CPL  -0.169    2.026      80.8  -29.2      2.68e-02 1.70e-01   55.360 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: 7.104000 sec.
T50 in the 50-300 keV band: 1.920000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    7.800   -4.348    3.452
T90     7.092   -3.956    3.136
T50     3.568   -1.880    1.688
Peak    1.000    1.564    2.564

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
    3.0739    46.9675   0.0151    15.8711   -26.8581         0.3952333     12.716 TRIG_00841548                 
 
Foreground time interval of the image:
 -4.348   3.452 (delta_t =   7.800 [sec])
Background time interval of the image:
-239.752  -4.348 (delta_t = 235.404 [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 1.024000

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 1.024000

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 1.024000

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   -4.348 sec. to    3.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53439     ( -0.251142   0.257847 )
Norm@50keV  : 2.85858E-03    ( -0.000390893   0.000382703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.22 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.886337e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.360276 ( -0.046343  0.046437 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10409e-07 ( -3.17459e-08  3.22659e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -4.348 sec. to    3.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53285     ( -0.269194   0.24333 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 2.86601E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.24 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     56 degrees of freedom 
# Null hypothesis probability =   1.644692e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.361555 ( -0.049459  0.046637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.32811e-07 ( -3.41324e-08  2.5479e-08 ) ergs/cm2

Band function

Time interval is from   -4.348 sec. to    3.452 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 15.0179  (-2.71013  3.54087)
R^2/D10^2   : 3.83712E-02  (-0.0381484   0.0385261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          92.17 using 59 PHA bins.
# Reduced chi-squared =          1.617 for     57 degrees of freedom 
# Null hypothesis probability =   2.195185e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.413e-08   3.822e-09
25- 50  5.620e-08   1.204e-08
50-150  8.631e-08   2.482e-08
15-150  1.566e-07   3.155e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.359       (-82.0298      -199.362)
Norm        : 1.45639       (-0.185321     0.185607)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.42 using 59 PHA bins.
# Reduced chi-squared =          1.200 for     57 degrees of freedom 
# Null hypothesis probability =   1.429123e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.829e-08   1.599e-08
25- 50  5.441e-08   3.039e-08
50-150  1.193e-07   6.540e-08
15-150  2.020e-07   1.119e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.43697        (-1.05469      2.06312)
R1^2/D10^2  : 8.76487        (-7.76684      66.5522)
kT2 [keV]   : 22.3862        (-5.19739      9.88235)
R2^2/D10^2  : 8.95059E-03    (-0.00621767   0.0130501)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.94 using 59 PHA bins.
# Reduced chi-squared =          1.199 for     55 degrees of freedom 
# Null hypothesis probability =   1.483797e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.478e-08   1.798e-08
25- 50  4.080e-08   1.261e-08
50-150  1.285e-07   5.093e-08
15-150  2.041e-07   6.525e-08

Peak spectrum fit

Power-law model

Time interval is from    1.564 sec. to    2.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25014     ( -0.313918   0.311075 )
Norm@50keV  : 5.68434E-03    ( -0.00106212   0.0010611 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.82 using 59 PHA bins.
# Reduced chi-squared =          1.014 for     57 degrees of freedom 
# Null hypothesis probability =   4.447883e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.672326 ( -0.127363  0.127696 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.68932e-08 ( -1.17752e-08  1.19609e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.564 sec. to    2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.168862     ( -2.5461   1.50503 )
Epeak [keV] : 80.8241      ( -22.5083 -80.8179 )
Norm@50keV  : 2.68204E-02    ( -0.0268312   0.312478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.36 using 59 PHA bins.
# Reduced chi-squared =         0.9886 for     56 degrees of freedom 
# Null hypothesis probability =   4.990201e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.631847 ( -0.140473  0.136763 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.20355e-08 ( -1.25616e-08  1.31784e-08 ) ergs/cm2

Band function

Time interval is from    1.564 sec. to    2.564 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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]    : 17.6345  (-3.19551  4.20317)
R^2/D10^2   : 4.83331E-02  (-0.0248725   0.0464927)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.11 using 59 PHA bins.
# Reduced chi-squared =         0.9844 for     57 degrees of freedom 
# Null hypothesis probability =   5.084671e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.029e-09   1.174e-09
25- 50  1.379e-08   4.252e-09
50-150  3.096e-08   1.166e-08
15-150  4.778e-08   1.488e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-73.3514      -200)
Norm        : 2.77701       (-0.522779     0.522779)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.44 using 59 PHA bins.
# Reduced chi-squared =          1.043 for     57 degrees of freedom 
# Null hypothesis probability =   3.867568e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.915e-09   4.043e-09
25- 50  1.330e-08   7.725e-09
50-150  2.917e-08   1.672e-08
15-150  4.939e-08   2.870e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.86773        (-3.74384      180.295)
R1^2/D10^2  : 3.25167        (-3.44919      48.3579)
kT2 [keV]   : 19.3421        (-3.97273      -19.2961)
R2^2/D10^2  : 3.36486E-02    (-0.0339354   0.0344724)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.12 using 59 PHA bins.
# Reduced chi-squared =         0.9839 for     55 degrees of freedom 
# Null hypothesis probability =   5.084178e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.965e-09   2.655e-09
25- 50  1.279e-08   6.607e-09
50-150  3.303e-08   1.754e-08
15-150  5.079e-08   2.749e-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: 1.53439     ( -0.251142   0.257847 )
Norm@50keV  : 2.85858E-03    ( -0.000390893   0.000382703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.22 using 59 PHA bins.
# Reduced chi-squared =          1.162 for     57 degrees of freedom 
# Null hypothesis probability =   1.886337e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.360266 ( -0.0463401  0.0464342 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.10389e-07 ( -3.17486e-08  3.22574e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.53285     ( -0.269482   0.243701 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 2.86601E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.24 using 59 PHA bins.
# Reduced chi-squared =          1.183 for     56 degrees of freedom 
# Null hypothesis probability =   1.644692e-01
 
Photon flux (15-150 keV)    in 7.8 sec: 0.360272 ( -0.045623  0.046237 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.11066e-07 ( -3.24613e-08  2.97359e-08 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  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)  = 5.29e-08
S(50-100 keV) = 7.31e-08

T90 vs. Hardness ratio plot

T90                                   = 7.0919998884201 sec.
Hardness ratio (energy fluence ratio) = 1.38185

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.952591
Count Ratio (50-100 keV) / (15-25 keV) = 0.723727

Mask shadow pattern

IMX = 2.536422733363475E-01, IMY = 1.284466905365120E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.752000 -4.348000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5206  35.3367    7.1  37.9   94.9   1.1433   1.6    8.8	Cyg X-1                       
308.0206  40.9940    5.0  29.3   91.8   0.7741   2.3    4.8	Cyg X-3                       
326.2526  38.3663    2.6  23.9   62.0   1.0704   4.4    4.7	Cyg X-2                       
185.6656  76.0419    2.3  44.5 -164.3   1.8136   4.9 ------	UNKNOWN

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

Time interval of the image:
-4.348000 3.452000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6009  35.0165   11.3  38.1   94.5   0.1150   1.0   11.1	Cyg X-1                       
308.1752  40.8031    3.0  29.4   91.3   0.1933   3.8    9.4	Cyg X-3                       
325.9506  38.3008   10.4  24.0   62.4   0.0446   1.1   10.5	Cyg X-2                       
  3.0740  46.9676    0.9  15.9  -26.9   0.3952  12.7 ------	UNKNOWN                       
125.5142  66.1142    2.2  51.6 -138.1   0.8537   5.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
49.548580 962.368000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0940  40.9075    3.8  39.3  111.7   5.7808   3.0    2.8	Cyg X-3                       
326.2495  38.2026    4.8  28.2   95.3   2.2943   2.4    8.0	Cyg X-2                       
271.3508  60.2416    2.9  51.4  150.4  12.6611   4.0 ------	UNKNOWN                       
  6.7794  13.6163    2.2  33.5    3.4   3.8494   5.3 ------	UNKNOWN

Plot creation:
Fri Jul  6 14:39:27 EDT 2018