batgrbproduct analysis for trigger=1274039

batgrbproduct Analysis for Trigger=1274039

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 22:09:24 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1274039
======================================================================

  Trigger: 01274039      Segment: 000

  BAT Trigger Time: 755749174.848   [s; MET]
      Trigger Stop: 755749175.872   [s; MET]
               UTC: 2024-12-13T02:19:00.145500    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 116.147921531733   Dec: 35.280440225944  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    20.83
     Image Trigger?:     NO
     Rate S/N Ratio:     127.59702190882  [ if not an image trigger ]
     Image S/N Ratio:    20.83

  Flight Position:   [ source = BAT ]
    RA: 116.147921531733   Dec: 35.280440225944  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 116.162888944608   Dec: 35.2681889963701  [deg; J2000]  
        { 07h 44m 39.1s , +35d 16' 05.5" }
         +/- 0.755464643737225 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.216978079468621 [arcmin] (formal 1-sigma fit error)
    SNR: 45.4044244039341
 
  Angular difference between Flight and Ground position is 1.038199 arcmin
 
  Partial Coding Fraction: 0.421875    [ including projection effects ]

  Duration
     T90: 8.13199985027313 +/- 1.7350458486518
        Measured from: -3.85199999809265
                   to: 4.27999985218048     [s; relative to TRIGTIME]
     T50: 2.31199991703033 +/- 0.138852424002053
        Measured from: -0.444000005722046
                   to: 1.86799991130829     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0359998941421509     
                   to: 1.03599989414215     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -12.2160000801086     
                   to: 6.44400000572205     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.111970   1.983931   1.966970   0.599037
           0.046222   0.052473   0.049138   0.036646 [error]
 Peak      0.215990   0.436611   0.507236   0.173195
           0.014894   0.019014   0.020095   0.014369 [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 3.71e-07 8.30e-07 1.46e-06 6.05e-06 3.99e-06 8.71e-06   erg/cm2
              Error 2.22e-08 2.95e-08 4.75e-08 4.48e-07 1.22e-07 4.71e-07   erg/cm2
Peak flux Power-law 7.86e-04 1.14e-02 1.04e-01 1.11e+01 4.65e-01 8.51e+00   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 3.34e-07 8.49e-07 1.53e-06 3.73e-06 3.94e-06 6.44e-06   erg/cm2
              Error 2.82e-08 3.20e-08 5.83e-08 8.92e-07 1.29e-07 8.85e-07   erg/cm2
Peak flux Cutoff-PL 1.93e+00 3.15e+00 3.36e+00 3.74e+00 1.01e+01 1.22e+01   ph/cm2/s
              Error 2.46e-01 1.87e-01 2.00e-01 1.08e+00 4.75e-01 1.15e+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    1.181    0.051    -      -           2.10e-02 6.14e-04   52.150 57
CPL   0.779    0.213     176.5   80.6      3.15e-02 6.65e-03   40.720 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.953    0.074    -      -           8.95e-02 4.03e-03   67.830 57
CPL   0.457    0.325     180.0  122.3      1.49e-01 4.99e-02   60.240 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: 5.632000 sec.
T50 in the 50-300 keV band: 1.984000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   18.660  -12.216    6.444
T90     8.132   -3.852    4.280
T50     2.312   -0.444    1.868
Peak    1.000    0.036    1.036

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
  116.1629    35.2682   0.0043    28.7857    91.6228         5.8989857     45.404 TRIG_01274039                 
 
Foreground time interval of the image:
-12.216   6.444 (delta_t =  18.660 [sec])
Background time interval of the image:
-146.547 -12.216 (delta_t = 134.331 [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  -12.216 sec. to    6.444 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18148     ( -0.0512834   0.0510216 )
Norm@50keV  : 2.10021E-02    ( -0.000614619   0.00061418 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.15     using 59 bins.
 Reduced chi-squared = 0.914912
# Null hypothesis probability of 6.57e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.45899 ( -0.0763  0.07642 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.99753e-06 ( -1.22354e-07  1.2251e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -12.216 sec. to    6.444 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.778777     ( -0.21799   0.207731 )
Epeak [keV] : 176.515      ( -41.8543 119.427 )
Norm@50keV  : 3.15272E-02    ( -0.0058149   0.00747807 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.72     using 59 bins.
 Reduced chi-squared = 0.727143
# Null hypothesis probability of 9.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.40883 ( -0.07999  0.08015 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93036e-06 ( -1.28798e-07  1.28295e-07 ) ergs/cm2

Band function

Time interval is from  -12.216 sec. to    6.444 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]    : 20.5261  (  )
R^2/D10^2   : 0.104776  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  217.83     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.22e-20 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.571e-07   9.134e-09
25- 50  7.961e-07   3.676e-08
50-150  2.494e-06   1.138e-07
15-150  3.448e-06   1.176e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 10.4482       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  201.96     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.36e-18 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.855e-07   1.567e-08
25- 50  9.339e-07   2.920e-08
50-150  2.048e-06   7.091e-08
15-150  3.468e-06   1.036e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.42927        (-1.09804      1.23055)
R1^2/D10^2  : 1.01509        (-0.335245      0.559775)
kT2 [keV]   : 31.3140        (-3.04921      4.3097)
R2^2/D10^2  : 2.19732E-02    (-0.00787141   0.00955444)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.64     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.26e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.135e-07   3.648e-08
25- 50  8.669e-07   5.925e-08
50-150  2.765e-06   2.305e-07
15-150  3.945e-06   2.351e-07

Peak spectrum fit

Power-law model

Time interval is from    0.036 sec. to    1.036 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.953132     ( -0.0747271   0.0739937 )
Norm@50keV  : 8.95058E-02    ( -0.00402907   0.00402397 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.83     using 59 bins.
 Reduced chi-squared = 1.19
# Null hypothesis probability of 1.54e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.464730 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.84555e-07 ( -4.77483e-08  4.78498e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.036 sec. to    1.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.456909     ( -0.3371   0.312906 )
Epeak [keV] : 180.035      ( -50.2213 194.361 )
Norm@50keV  : 0.149154    ( -0.040225   0.0595523 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.24     using 59 bins.
 Reduced chi-squared = 1.07571
# Null hypothesis probability of 3.25e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 10.1495 ( -0.475  0.475 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.75306e-08 ( -3.55753e-08  3.59134e-08 ) ergs/cm2

Band function

Time interval is from    0.036 sec. to    1.036 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]    : 22.0340  (  )
R^2/D10^2   : 0.380583  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  118.15     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.63e-06 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.417e-08   2.975e-09
25- 50  1.809e-07   1.155e-08
50-150  6.560e-07   4.655e-08
15-150  8.711e-07   5.090e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (      )
Norm        : 40.7036       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  231.46     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.93e-23 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.014e-07   5.140e-09
25- 50  1.950e-07   9.800e-09
50-150  4.276e-07   2.285e-08
15-150  7.239e-07   3.995e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 12.3761        (-2.57541      2.59719)
R1^2/D10^2  : 1.38685        (-0.473259      0.969559)
kT2 [keV]   : 47.7012        (-13.5663      56.8315)
R2^2/D10^2  : 2.71481E-02    (-0.0214011   0.0509869)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.18     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.26e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.201e-08   8.990e-09
25- 50  1.968e-07   4.165e-08
50-150  7.207e-07   2.611e-07
15-150  9.696e-07   2.976e-07

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: 1.18148     ( -0.0512834   0.0510216 )
Norm@50keV  : 2.10021E-02    ( -0.000614619   0.00061418 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.15     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.57e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.45898 ( -0.07629  0.0764188 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.99705e-06 ( -1.2236e-07  1.22498e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.778777     ( -0.21799   0.207731 )
Epeak [keV] : 176.515      ( -41.8543 119.427 )
Norm@50keV  : 3.15272E-02    ( -0.0058149   0.00747806 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   40.72     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 9.38e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 18.66 sec: 2.40868 ( -0.07996  0.08014 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.93207e-06 ( -1.29034e-07  1.28418e-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)  = 8.30e-07
S(50-100 keV) = 1.46e-06

T90 vs. Hardness ratio plot

T90                                   = 8.13199985027313 sec.
Hardness ratio (energy fluence ratio) = 1.75904

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.78416
Count Ratio (50-100 keV) / (15-25 keV) = 1.76891

Mask shadow pattern

IMX = -1.555907487129259E-02, IMY = -5.492086444347903E-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:
-146.547400 -12.216000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
148.0655  -0.1524    2.5  43.0   10.5   1.3821   4.6 ------	UNKNOWN                       
107.9239  76.5830    2.6  38.6  169.3   1.4223   4.4 ------	UNKNOWN                       
176.0534  76.1734    2.5  35.0 -165.9   1.1206   4.7 ------	UNKNOWN                       
227.3971  56.0931    2.6  48.1 -129.2   3.9541   4.4 ------	UNKNOWN

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

Time interval of the image:
-12.216000 6.444000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 62.9263  65.3719    2.6  51.7  152.3   1.8869   4.4 ------	UNKNOWN                       
116.1629  35.2682    0.3  28.8   91.6   5.8990  45.4 ------	UNKNOWN                       
145.1171  30.2672    2.5  13.7   31.4   0.3221   4.7 ------	UNKNOWN                       
170.2372  -3.1389    3.2  48.7  -19.8   0.5475   3.6 ------	UNKNOWN                       
190.1533  43.3169    2.3  27.5 -100.0   0.4357   5.1 ------	UNKNOWN                       
240.0181  62.7029    2.7  52.0 -140.0   1.2158   4.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
84.852600 943.852610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6169  22.0270    0.7  31.2   85.8  33.5826  16.3    1.2	Crab                          
117.1588  -7.7619    3.8  43.0   10.6   5.1943   3.0 ------	UNKNOWN                       
147.3813  31.6259    3.1  26.2  -78.9   4.7464   3.7 ------	UNKNOWN                       
149.4108 -12.7996    2.3  57.5  -27.3  29.2785   5.0 ------	UNKNOWN                       
158.3941  21.0901    2.6  39.5  -68.4  12.5559   4.5 ------	UNKNOWN                       
181.7274  59.2072    2.7  48.1 -129.1  22.4579   4.3 ------	UNKNOWN

Plot creation:
Fri Jun 20 02:00:36 EDT 2025