batgrbproduct analysis for trigger=903158

batgrbproduct Analysis for Trigger=903158

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): Mon Jul 15 19:10:48 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger903158
======================================================================

  Trigger: 00903158      Segment: 000

  BAT Trigger Time: 579251711.168   [s; MET]
      Trigger Stop: 579251715.264   [s; MET]
               UTC: 2019-05-11T07:14:48.282980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 126.436247844037   Dec: -20.241918781366  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.72
     Image Trigger?:     NO
     Rate S/N Ratio:     38.7040049607273  [ if not an image trigger ]
     Image S/N Ratio:    9.72

  Flight Position:   [ source = BAT ]
    RA: 126.436247844037   Dec: -20.241918781366  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 126.443352200869   Dec: -20.2516490161234  [deg; J2000]  
        { 08h 25m 46.4s , -20d 15' 05.9" }
         +/- 1.54578529804546 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.573521889661727 [arcmin] (formal 1-sigma fit error)
    SNR: 16.3269580370783
 
  Angular difference between Flight and Ground position is 0.707656 arcmin
 
  Partial Coding Fraction: 0.09082031    [ including projection effects ]

  Duration
     T90: 27.6640000343323 +/- 2.35417588983274
        Measured from: -21.7919999361038
                   to: 5.87200009822845     [s; relative to TRIGTIME]
     T50: 15.7760000228882 +/- 1.75635985311219
        Measured from: -14.2239999771118
                   to: 1.55200004577637     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.356000065803528     
                   to: 1.35600006580353     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.2719999551773     
                   to: 6.87999999523163     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.482746   3.318016   3.490758   1.604831
           0.182192   0.210369   0.201215   0.162955 [error]
 Peak      0.064672   0.277670   0.368425   0.092962
           0.035118   0.047866   0.049889   0.037150 [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 7.04e-07 1.55e-06 2.70e-06 1.09e-05 7.38e-06 1.59e-05   erg/cm2
              Error 9.17e-08 1.25e-07 1.83e-07 1.60e-06 4.79e-07 1.69e-06   erg/cm2
Peak flux Power-law 2.17e-04 2.16e-03 3.07e-02 2.65e+00 1.41e-01 2.64e+00   ph/cm2/s
              Error 1.34e-04 1.45e-03 1.39e-02 9.06e-01 5.80e-02 9.41e-01   ph/cm2/s
 
Fluence   Cutoff-PL 1.66e-07 2.16e-07 2.17e-07 4.86e-07 7.29e-07 1.08e-06   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL 8.29e-01 2.21e+00 2.38e+00 7.32e-01 6.01e+00 6.15e+00   ph/cm2/s
              Error 5.70e-01 5.82e-01 5.10e-01 5.35e-01 1.22e+00 1.31e+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    1.202    0.105    -      -           2.34e-02 1.54e-03   62.040 57
CPL   0.579    0.466     135.5  102.9      4.37e-02 2.08e-02   56.040 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.227    0.261    -      -           5.27e-02 1.00e-02   64.910 57
CPL  -1.297    1.726      78.3   20.5      6.39e-01 2.01e+00   53.860 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: 28.416000 sec.
T50 in the 50-300 keV band: 15.936000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   31.152  -24.272    6.880
T90    27.664  -21.792    5.872
T50    15.776  -14.224    1.552
Peak    1.000    0.356    1.356

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
  126.4434   -20.2516   0.0118    56.3270    -4.3011        10.8558042     16.327 TRIG_00903158                 
 
Foreground time interval of the image:
-24.272   6.880 (delta_t =  31.152 [sec])
Background time interval of the image:
-86.867 -24.272 (delta_t =  62.595 [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 4.096000

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 4.096000

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 4.096000

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  -24.272 sec. to    6.880 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.20163     ( -0.105733   0.103783 )
Norm@50keV  : 2.33828E-02    ( -0.00154041   0.0015348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.04 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.012905e-01
 
Photon flux (15-150 keV)    in 31.15 sec: 2.74531 ( -0.19428  0.19508 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.387e-06 ( -4.79071e-07  4.79794e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -24.272 sec. to    6.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.579282     ( -0.490712   0.441394 )
Epeak [keV] : 135.503      ( -35.1735 170.666 )
Norm@50keV  : 4.36972E-02    ( -0.0153597   0.0262939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.04 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.732105e-01
 
Photon flux (15-150 keV)    in 31.15 sec: 2.68748 ( -0.19729  0.19844 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.29337e-07 ( 0  0 ) ergs/cm2

Band function

Time interval is from  -24.272 sec. to    6.880 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]    : 20.7047  (-1.53061  1.70756)
R^2/D10^2   : 0.116929  (-0.0278933   0.0353714)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          88.95 using 59 PHA bins.
# Reduced chi-squared =          1.561 for     57 degrees of freedom 
# Null hypothesis probability =   4.321589e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.968e-07   3.835e-08
25- 50  1.512e-06   1.561e-07
50-150  4.825e-06   4.221e-07
15-150  6.633e-06   4.750e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-10.1275      -200)
Norm        : 11.9617       (-0.780263     0.780263)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          93.89 using 59 PHA bins.
# Reduced chi-squared =          1.647 for     57 degrees of freedom 
# Null hypothesis probability =   1.511161e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.282e-07   6.760e-08
25- 50  1.786e-06   1.313e-07
50-150  3.916e-06   9.611e-07
15-150  6.630e-06   1.033e-06

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 10.8448        (-2.83352      1.6769)
R1^2/D10^2  : 0.597502        (-0.292289      0.78091)
kT2 [keV]   : 38.1311        (-10.1403      48.8925)
R2^2/D10^2  : 1.15903E-02    (-0.0103221   0.0150234)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.50 using 59 PHA bins.
# Reduced chi-squared =         0.9728 for     55 degrees of freedom 
# Null hypothesis probability =   5.319301e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.261e-07   1.674e-07
25- 50  1.737e-06   4.961e-07
50-150  5.071e-06   2.082e-06
15-150  7.335e-06   2.502e-06

Peak spectrum fit

Power-law model

Time interval is from    0.356 sec. to    1.356 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.22708     ( -0.263277   0.258082 )
Norm@50keV  : 5.26869E-02    ( -0.0100649   0.0100323 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.91 using 59 PHA bins.
# Reduced chi-squared =          1.139 for     57 degrees of freedom 
# Null hypothesis probability =   2.203732e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.141097 ( -0.026836  0.08907 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.3064e-07 ( -1.01677e-07  1.01728e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.356 sec. to    1.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29734     ( -2.03287   1.42011 )
Epeak [keV] : 78.2510      ( -13.6989 27.2077 )
Norm@50keV  : 0.639092    ( -0.639076   3.37399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.86 using 59 PHA bins.
# Reduced chi-squared =         0.9618 for     56 degrees of freedom 
# Null hypothesis probability =   5.561988e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.01150 ( -1.20986  1.23723 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.38456e-07 ( -1.06291e-07  1.05951e-07 ) ergs/cm2

Band function

Time interval is from    0.356 sec. to    1.356 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]    : 19.8910  (-3.09102  3.72661)
R^2/D10^2   : 0.341869  (-0.155509   0.265904)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.93 using 59 PHA bins.
# Reduced chi-squared =         0.9461 for     57 degrees of freedom 
# Null hypothesis probability =   5.909898e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.613e-08   9.835e-09
25- 50  1.297e-07   3.691e-08
50-150  3.801e-07   1.084e-07
15-150  5.359e-07   1.407e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-54.1022      -200)
Norm        : 26.9388       (-5.14704     5.14704)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.26 using 59 PHA bins.
# Reduced chi-squared =          1.180 for     57 degrees of freedom 
# Null hypothesis probability =   1.659415e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.708e-08   3.882e-08
25- 50  1.290e-07   7.400e-08
50-150  2.830e-07   1.647e-07
15-150  4.791e-07   2.770e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 10.5158        (-11.6057      -11.6057)
R1^2/D10^2  : 0.200096        (-0.236956      -0.236956)
kT2 [keV]   : 20.5577        (-20.9211      -20.9211)
R2^2/D10^2  : 0.289679    (-0.261684   0.341988)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.87 using 59 PHA bins.
# Reduced chi-squared =         0.9795 for     55 degrees of freedom 
# Null hypothesis probability =   5.177382e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.791e-08   9.885e-08
25- 50  1.305e-07   1.066e-06
50-150  3.794e-07   9.295e-06
15-150  5.379e-07   1.491e-05

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: 1.20163     ( -0.105733   0.103783 )
Norm@50keV  : 2.33828E-02    ( -0.00154041   0.0015348 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.04 using 59 PHA bins.
# Reduced chi-squared =          1.088 for     57 degrees of freedom 
# Null hypothesis probability =   3.012905e-01
 
Photon flux (15-150 keV)    in 31.15 sec: 2.74529 ( -0.194272  0.195067 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.38623e-06 ( -4.79479e-07  4.79707e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.579279     ( -0.490712   0.441394 )
Epeak [keV] : 135.503      ( -35.1735 170.666 )
Norm@50keV  : 4.36973E-02    ( -0.0153549   0.0262939 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.04 using 59 PHA bins.
# Reduced chi-squared =          1.001 for     56 degrees of freedom 
# Null hypothesis probability =   4.732105e-01
 
Photon flux (15-150 keV)    in 31.15 sec: 2.68734 ( -0.19724  0.1984 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.3143e-06 ( -4.91609e-07  4.89616e-07 ) 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)  = 1.55e-06
S(50-100 keV) = 2.70e-06

T90 vs. Hardness ratio plot

T90                                   = 27.6640000343323 sec.
Hardness ratio (energy fluence ratio) = 1.74194

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 2.23775
Count Ratio (50-100 keV) / (15-25 keV) = 2.35425

Mask shadow pattern

IMX = 1.496742258843311E+00, IMY = 1.125690093231964E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000

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:
-86.867410 -24.272000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3590 -40.4426   24.5  36.7    8.4   0.1135   0.5   10.3	Vela X-1                      
169.8903 -60.5931    0.0  23.3   63.1   0.6220   2.9   12.7	Cen X-3                       
186.3288 -62.7395    6.4  25.3   82.2   0.4710   1.8    9.2	GX 301-2                      
171.6895 -44.1029    2.2  39.0   52.8   2.2565   5.2 ------	UNKNOWN                       
266.4484 -64.4962    2.0  37.7  144.6   2.0247   5.7 ------	UNKNOWN                       
 26.8906 -66.8900    2.9  26.9 -133.4   0.6928   3.9 ------	UNKNOWN                       
 30.0234 -47.5496    2.6  43.8 -116.3   3.0617   4.4 ------	UNKNOWN                       
 25.4684 -47.1699    2.0  45.2 -120.3   3.9537   5.8 ------	UNKNOWN

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

Time interval of the image:
-24.272000 6.880000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5987 -40.4987    7.6  36.7    8.8   0.2556   1.5    4.6	Vela X-1                      
170.6200 -60.6916   15.2  23.4   64.0  -0.1279  -0.8    9.8	Cen X-3                       
186.7802 -62.6371    4.1  25.5   82.4  -0.5405  -2.9    8.7	GX 301-2                      
202.1766 -53.5374    3.2  37.2   88.6   1.6709   3.6 ------	UNKNOWN                       
269.6777 -58.7741    2.8  43.6  145.4   1.4601   4.2 ------	UNKNOWN                       
126.4434 -20.2517    0.7  56.3   -4.3  10.8550  16.3 ------	UNKNOWN                       
 57.8676 -44.0166    2.6  40.6  -87.3   1.8523   4.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
112.132600 384.432590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.7497 -40.5019    6.3  21.8  140.1   1.2612   1.8   10.6	Vela X-1                      
123.0442  27.1198    2.1  47.5  -24.6   6.1906   5.4 ------	UNKNOWN                       
 79.9930 -18.3853    2.4  43.7 -116.3  12.0247   4.8 ------	UNKNOWN

Plot creation:
Tue Jul 16 15:54:53 EDT 2019