batgrbproduct analysis for trigger=1339848

batgrbproduct Analysis for Trigger=1339848

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): Sun Mar  1 04:03:12 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1339848
======================================================================

  Trigger: 01339848      Segment: 000

  BAT Trigger Time: 776066984.96   [s; MET]
      Trigger Stop: 776066985.984   [s; MET]
               UTC: 2025-08-05T06:09:08.869860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 24.1534268197707   Dec: -81.4065556494068  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.91
     Image Trigger?:     NO
     Rate S/N Ratio:     16.8226038412607  [ if not an image trigger ]
     Image S/N Ratio:    8.91

  Flight Position:   [ source = BAT ]
    RA: 24.1534268197707   Dec: -81.4065556494068  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 24.1628297445201   Dec: -81.401992742607  [deg; J2000]  
        { 01h 36m 39.1s , -81d 24' 07.2" }
         +/- 1.42392069875053 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.611616163184261 [arcmin] (formal 1-sigma fit error)
    SNR: 18.3591659251397
 
  Angular difference between Flight and Ground position is 0.286466 arcmin
 
  Partial Coding Fraction: 0.65625    [ including projection effects ]

  Duration
     T90: 84.2719999551773 +/- 11.056917820506
        Measured from: -56.932000041008
                   to: 27.3399999141693     [s; relative to TRIGTIME]
     T50: 19.7159999608994 +/- 6.54797981743245
        Measured from: -12.5440000295639
                   to: 7.17199993133545     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.46399998664856     
                   to: 1.46399998664856     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -65.0320000648499     
                   to: 43.663999915123     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.015318   1.527152   1.065960   0.212348
           0.081986   0.086130   0.073655   0.063383 [error]
 Peak      0.044567   0.076960   0.077106   0.008673
           0.008841   0.009886   0.008617   0.006571 [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 3.57e-07 6.17e-07 8.16e-07 2.20e-06 2.38e-06 3.99e-06   erg/cm2
              Error 3.83e-08 4.20e-08 7.03e-08 3.94e-07 1.71e-07 4.52e-07   erg/cm2
Peak flux Power-law 5.05e-01 5.52e-01 4.29e-01 5.48e-01 1.69e+00 2.03e+00   ph/cm2/s
              Error 1.14e-01 8.10e-02 6.53e-02 1.62e-01 2.31e-01 2.74e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.03e-07 6.87e-07 8.53e-07 6.02e-07 2.22e-06 2.45e-06   erg/cm2
              Error 4.57e-08 5.54e-08 8.11e-08 3.62e-07 1.89e-07 3.98e-07   erg/cm2
Peak flux Cutoff-PL 3.59e-01 6.39e-01 5.01e-01 1.43e-01 1.61e+00 1.64e+00   ph/cm2/s
              Error 1.36e-01 1.05e-01 8.43e-02 1.16e-01 2.37e-01 2.59e-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    1.597    0.109    -      -           2.35e-03 1.58e-04   61.670 57
CPL   0.557    0.555      67.1   15.4      8.08e-03 5.86e-03   48.540 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.363    0.201    -      -           1.40e-02 1.86e-03   54.070 57
CPL  -0.391    1.198      70.2   21.2      1.02e-01 2.20e-01   44.380 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: 70.528000 sec.
T50 in the 50-300 keV band: 28.352000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  108.696  -65.032   43.664
T90    84.272  -56.932   27.340
T50    19.716  -12.544    7.172
Peak    1.000    0.464    1.464

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
   24.1628   -81.4020   0.0105    35.2073     2.9833         4.2250354     18.359 TRIG_01339848                 
 
Foreground time interval of the image:
-65.032  43.664 (delta_t = 108.696 [sec])
Background time interval of the image:
-158.459 -65.032 (delta_t =  93.427 [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  -65.032 sec. to   43.664 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.59736     ( -0.108716   0.109539 )
Norm@50keV  : 2.34590E-03    ( -0.000158238   0.000157724 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.67     using 59 bins.
 Reduced chi-squared = 1.08193
# Null hypothesis probability of 3.13e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 108.7 sec: 0.301222 ( -0.020261  0.020291 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38589e-06 ( -1.70808e-07  1.71811e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -65.032 sec. to   43.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.557442     ( -0.590911   0.518242 )
Epeak [keV] : 67.0693      ( -9.6924 21.1027 )
Norm@50keV  : 8.08405E-03    ( -0.00366434   0.00805246 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.54     using 59 bins.
 Reduced chi-squared = 0.866786
# Null hypothesis probability of 7.50e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 108.7 sec: 0.288560 ( -0.021208  0.021214 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.2139e-06 ( -1.87856e-07  1.90346e-07 ) ergs/cm2

Band function

Time interval is from  -65.032 sec. to   43.664 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]    : 13.8674  (-0.977325  1.06775)
R^2/D10^2   : 4.55534E-02  (-0.0108553   0.013963)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.86     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.67e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.013e-07   2.511e-08
25- 50  7.416e-07   6.055e-08
50-150  9.345e-07   1.271e-07
15-150  1.877e-06   1.527e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 158.696       (-39.4863      -159.057)
Norm        : 1.25365       (-0.0933283     0.099583)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.83     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.95e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.482e-07   2.995e-08
25- 50  6.507e-07   8.066e-08
50-150  1.314e-06   4.911e-07
15-150  2.313e-06   5.805e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.75240        (-2.87325      2.46965)
R1^2/D10^2  : 0.148054        (-0.0691858      0.286169)
kT2 [keV]   : 24.5902        (-7.06119      25.9168)
R2^2/D10^2  : 3.66041E-03    (-0.00331782   0.0122182)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.02     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.01e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.786e-07   7.636e-08
25- 50  7.180e-07   1.871e-07
50-150  1.234e-06   5.639e-07
15-150  2.231e-06   7.381e-07

Peak spectrum fit

Power-law model

Time interval is from    0.464 sec. to    1.464 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.36306     ( -0.201908   0.200582 )
Norm@50keV  : 1.39976E-02    ( -0.00185949   0.00185824 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.07     using 59 bins.
 Reduced chi-squared = 0.948596
# Null hypothesis probability of 5.86e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.69097 ( -0.23072  0.23131 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.3633e-07 ( -1.93666e-08  1.94853e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.464 sec. to    1.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.391275     ( -1.36039   1.03583 )
Epeak [keV] : 70.2187      ( -12.2693 30.0901 )
Norm@50keV  : 0.101864    ( -0.101864   0.33851 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.38     using 59 bins.
 Reduced chi-squared = 0.7925
# Null hypothesis probability of 8.69e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.61224 ( -0.23736  0.23748 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25774e-07 ( -2.00119e-08  2.05616e-08 ) ergs/cm2

Band function

Time interval is from    0.464 sec. to    1.464 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]    : 16.3550  (-2.04292  2.41996)
R^2/D10^2   : 0.159503  (-0.0619867   0.0956191)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.18     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.47e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.777e-09   2.189e-09
25- 50  3.762e-08   7.115e-09
50-150  7.092e-08   1.740e-08
15-150  1.173e-07   2.126e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-56.869      -200)
Norm        : 7.11872       (-0.940998     0.940998)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.24     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.17e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.773e-08   1.011e-08
25- 50  3.410e-08   1.883e-08
50-150  7.479e-08   4.130e-08
15-150  1.266e-07   6.990e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.90889        (-6.80687      -6.80687)
R1^2/D10^2  : 0.763045        (-0.792565      -0.792565)
kT2 [keV]   : 18.8389        (-4.76319      -18.8057)
R2^2/D10^2  : 8.60881E-02    (-0.0869243   0.119064)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.27     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.49e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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: 1.59736     ( -0.108716   0.109539 )
Norm@50keV  : 2.34590E-03    ( -0.000158238   0.000157724 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.67     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.13e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 108.7 sec: 0.301212 ( -0.0202593  0.0202895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38555e-06 ( -1.70925e-07  1.71837e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.557439     ( -0.590911   0.518243 )
Epeak [keV] : 67.0693      ( -9.6924 21.1027 )
Norm@50keV  : 8.08409E-03    ( -0.00366434   0.00805246 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.50e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 108.7 sec: 0.288530 ( -0.021203  0.021207 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.21466e-06 ( -1.88073e-07  1.90464e-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)  = 6.17e-07
S(50-100 keV) = 8.16e-07

T90 vs. Hardness ratio plot

T90                                   = 84.2719999551773 sec.
Hardness ratio (energy fluence ratio) = 1.32253

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.50411
Count Ratio (50-100 keV) / (15-25 keV) = 1.04988

Mask shadow pattern

IMX = 7.046558898377212E-01, IMY = -3.672382330436688E-02

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:
-158.459400 -65.032000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 13.7728 -16.9912    2.9  37.1  132.5   1.4678   4.0 ------	UNKNOWN                       
 88.1499 -82.7411    2.9  38.7   -9.8   0.8563   4.0 ------	UNKNOWN                       
 62.7951  -1.6766    2.8  48.8 -151.6   1.4586   4.1 ------	UNKNOWN                       
 67.5209   5.3515    2.9  57.1 -149.2   3.9316   3.9 ------	UNKNOWN                       
 76.2343  -7.6999    2.6  49.3 -132.1   3.3257   4.5 ------	UNKNOWN

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

Time interval of the image:
-65.032000 43.664000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 24.1626 -81.4020    0.6  35.2    3.0   4.2241  18.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
851.440590 962.069200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6246  22.0019    1.5  48.7 -142.5   3.7852   7.7    0.9	Crab                          
135.6770 -40.5083    4.6  53.3  -32.8   1.8542   2.5    7.3	Vela X-1                      
 38.9231 -40.8783    3.1  32.1   77.6   1.3484   3.8 ------	UNKNOWN                       
 61.2859 -70.1343    1.9  45.0   30.1   2.1739   5.9 ------	UNKNOWN                       
 58.8241 -46.3670    3.1  23.7   49.6   0.8578   3.7 ------	UNKNOWN                       
 63.6490  -2.4040    2.9  25.0 -178.5   0.7025   3.9 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:34:30 EST 2026