batgrbproduct analysis for trigger=1319125

batgrbproduct Analysis for Trigger=1319125

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 v2.48
    Process Start Time (local time): Thu Jun 19 20:34:40 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1319125
======================================================================

  Trigger: 01319125      Segment: 000

  BAT Trigger Time: 770324358.592   [s; MET]
      Trigger Stop: 770324360.64   [s; MET]
               UTC: 2025-05-30T18:58:42.893720    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 55.143001589254   Dec: -22.4591568533006  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.76
     Image Trigger?:     NO
     Rate S/N Ratio:     13.4536240470737  [ if not an image trigger ]
     Image S/N Ratio:    6.76

  Flight Position:   [ source = BAT ]
    RA: 55.143001589254   Dec: -22.4591568533006  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 55.1416226771692   Dec: -22.4575281881256  [deg; J2000]  
        { 03h 40m 34.0s , -22d 27' 27.1" }
         +/- 1.91618483682402 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.04395511088916 [arcmin] (formal 1-sigma fit error)
    SNR: 12.0125824398403
 
  Angular difference between Flight and Ground position is 0.124078 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 65.3279999494553 +/- 25.1066792740014
        Measured from: -28.1679999828339
                   to: 37.1599999666214     [s; relative to TRIGTIME]
     T50: 26.8000000715256 +/- 5.67594227565369
        Measured from: -20.0240000486374
                   to: 6.77600002288818     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.276000022888184     
                   to: 0.723999977111816     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -29.7360000610352     
                   to: 57.960000038147     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.360134   0.454528   0.402296   0.156616
           0.054539   0.056921   0.048262   0.041008 [error]
 Peak      0.024320   0.036979   0.033686   0.008456
           0.006373   0.006819   0.005774   0.004775 [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 9.73e-08 1.98e-07 3.15e-07 1.11e-06 8.75e-07 1.72e-06   erg/cm2
              Error 2.18e-08 2.63e-08 4.75e-08 3.78e-07 1.17e-07 4.08e-07   erg/cm2
Peak flux Power-law 2.24e-01 2.62e-01 2.21e-01 3.15e-01 8.20e-01 1.02e+00   ph/cm2/s
              Error 7.78e-02 5.54e-02 4.69e-02 1.44e-01 1.53e-01 1.94e-01   ph/cm2/s
 
Fluence   Cutoff-PL 9.82e-08 1.97e-07 3.13e-07 1.18e-06 8.77e-07 1.66e-06   erg/cm2
              Error 2.41e-08 2.84e-08 5.21e-08 4.36e-07 1.28e-07 5.53e-07   erg/cm2
Peak flux Cutoff-PL 2.25e-01 2.62e-01 2.21e-01 3.22e-01 8.21e-01 1.03e+00   ph/cm2/s
              Error 7.54e-02 5.88e-02 4.66e-02 1.11e-01 1.53e-01 2.36e-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    1.333    0.218    -      -           1.02e-03 1.22e-04   63.680 57
CPL   1.315    0.917    9988.3    0.0      1.04e-03 9.04e-04   63.760 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.248    0.323    -      -           6.94e-03 1.25e-03   35.190 57
CPL   1.244    1.646    9998.6    0.0      6.97e-03 9.64e-03   35.190 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: 35.840000 sec.
T50 in the 50-300 keV band: 27.776000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   87.696  -29.736   57.960
T90    65.328  -28.168   37.160
T50    26.800  -20.024    6.776
Peak    1.000   -0.276    0.724

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
   55.1416   -22.4575   0.0160    23.9150  -156.5530         1.2736484     12.013 TRIG_01319125                 
 
Foreground time interval of the image:
-29.736  24.709 (delta_t =  54.445 [sec])
Background time interval of the image:
-105.891 -29.736 (delta_t =  76.155 [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

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)

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  -29.736 sec. to   57.960 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33320     ( -0.218819   0.216466 )
Norm@50keV  : 1.01790E-03    ( -0.000122352   0.000121976 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.68     using 59 bins.
 Reduced chi-squared = 1.11719
# Null hypothesis probability of 2.53e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 87.7 sec: 0.122213 ( -0.015064  0.015104 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.75326e-07 ( -1.16888e-07  1.17927e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -29.736 sec. to   57.960 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31463     ( -0.651048   1.18391 )
Epeak [keV] : 9988.33      ( -9999.33 -9999.33 )
Norm@50keV  : 1.03968E-03    ( -0.000789643   0.00101924 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.76     using 59 bins.
 Reduced chi-squared = 1.13857
# Null hypothesis probability of 2.22e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 87.7 sec: 0.122654 ( -0.016859  0.015808 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.7878e-07 ( -1.31919e-07  1.23962e-07 ) ergs/cm2

Band function

Time interval is from  -29.736 sec. to   57.960 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]    : 17.8476  (-2.82206  3.55567)
R^2/D10^2   : 7.73238E-03  (-0.00352241   0.00616478)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   84.63     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.02e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.337e-08   1.102e-08
25- 50  1.993e-07   3.661e-08
50-150  4.597e-07   1.097e-07
15-150  7.024e-07   1.385e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-47.9393      -200)
Norm        : 0.505539       (-0.0609556     0.0609556)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.46     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.62e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.104e-07   6.117e-08
25- 50  2.125e-07   1.169e-07
50-150  4.659e-07   2.554e-07
15-150  7.888e-07   4.328e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.57411        (-1.67759      2.81175)
R1^2/D10^2  : 0.275979        (-0.211098      0.810255)
kT2 [keV]   : 27.3438        (-6.52773      16.0562)
R2^2/D10^2  : 1.64989E-03    (-0.00125397   0.0020637)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.61     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.99e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.071e-07   5.767e-08
25- 50  1.814e-07   6.819e-08
50-150  5.820e-07   3.028e-07
15-150  8.705e-07   3.561e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.276 sec. to    0.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24770     ( -0.328865   0.317371 )
Norm@50keV  : 6.93682E-03    ( -0.0012536   0.00125305 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   35.19     using 59 bins.
 Reduced chi-squared = 0.617368
# Null hypothesis probability of 9.90e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.820141 ( -0.152787  0.153324 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.94736e-08 ( -1.38678e-08  1.4029e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.276 sec. to    0.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24373     ( -1.12922   2.16246 )
Epeak [keV] : 9998.63      ( -9998.71 -9998.71 )
Norm@50keV  : 6.96834E-03    ( -0.00125939   0.0180178 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   35.19     using 59 bins.
 Reduced chi-squared = 0.628393
# Null hypothesis probability of 9.87e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.820788 ( -0.153732  0.152371 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.95617e-08 ( -1.48135e-08  1.42684e-08 ) ergs/cm2

Band function

Time interval is from   -0.276 sec. to    0.724 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]    : 18.9054  (-4.73362  6.86409)
R^2/D10^2   : 4.36957E-02  (-0.0273587   0.0710364)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.33     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.90e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.075e-09   1.247e-09
25- 50  1.474e-08   5.862e-09
50-150  3.868e-08   1.464e-08
15-150  5.649e-08   1.935e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-69.9465      -200)
Norm        : 3.39974       (-0.624318     0.624318)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   37.86     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.76e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.466e-09   4.965e-09
25- 50  1.628e-08   9.380e-09
50-150  3.572e-08   2.060e-08
15-150  6.047e-08   3.408e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.93195        (-2.73008      4.59235)
R1^2/D10^2  : 0.839044        (-0.675102      2.56383)
kT2 [keV]   : 33.1519        (-11.9491      77.705)
R2^2/D10^2  : 6.16298E-03    (-0.00570955   0.0203389)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   34.26     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.87e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.405e-09   4.581e-09
25- 50  1.499e-08   8.475e-09
50-150  4.867e-08   2.783e-08
15-150  7.107e-08   3.679e-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: 1.33725     ( -0.181807   0.180187 )
Norm@50keV  : 1.55614E-03    ( -0.000158552   0.000158247 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.50e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 54.44 sec: 0.186986 ( -0.0195741  0.0196239 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.29802e-07 ( -9.35666e-08  9.42977e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.33373     ( -0.657401   0.287949 )
Epeak [keV] : 9982.79      ( -9930.78 -9930.78 )
Norm@50keV  : 1.56238E-03    ( -0.000553683   0.00202987 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.66     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.13e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 54.44 sec: 0.187083 ( -0.02084  0.019538 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.2721e-07 ( -1.00491e-07  9.65385e-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)  = 1.98e-07
S(50-100 keV) = 3.15e-07

T90 vs. Hardness ratio plot

T90                                   = 65.3279999494553 sec.
Hardness ratio (energy fluence ratio) = 1.59091

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.26211
Count Ratio (50-100 keV) / (15-25 keV) = 1.11707

Mask shadow pattern

IMX = -4.068355600406741E-01, IMY = 1.764502216963156E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-105.891400 -29.736000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6231 -40.5395    4.7  45.4   39.1   0.8085   2.4    4.4	Vela X-1                      
 23.4597 -16.1027    2.5  53.7 -167.9   1.7173   4.6 ------	UNKNOWN                       
 87.3368   4.1879    2.3  35.1  -67.6   1.1250   4.9 ------	UNKNOWN                       
 43.2840   3.9241    2.1  49.3 -132.3   3.5531   5.5 ------	UNKNOWN

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

Time interval of the image:
-29.736000 24.708590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5098 -40.4850    8.2  45.3   39.0  -0.4650  -1.4    4.3	Vela X-1                      
 19.9762 -53.8840    2.9  48.8  143.3   1.9187   4.0 ------	UNKNOWN                       
 23.8667 -44.4953    2.8  46.1  156.0   1.1490   4.1 ------	UNKNOWN                       
110.0226 -33.2041    2.5  25.2   24.7   0.5563   4.7 ------	UNKNOWN                       
 36.9482 -26.8641    2.4  38.1 -175.5   0.6518   4.8 ------	UNKNOWN                       
 55.1417 -22.4575    1.0  23.9 -156.6   1.2734  12.0 ------	UNKNOWN                       
 31.0194  -3.2964    2.5  53.9 -149.5   1.7376   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
89.908600 902.508000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 80.1797 -51.3067    2.8  34.7   46.0  19.8914   4.1 ------	UNKNOWN                       
 58.6682   3.0048    3.0  25.7  -98.3  13.3093   3.9 ------	UNKNOWN                       
 71.4918   8.0273    2.5  34.4  -76.9  22.6127   4.6 ------	UNKNOWN                       
 88.0904   9.7685    3.6  45.6  -57.8  40.4263   3.3 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:37:44 EDT 2025