batgrbproduct analysis for trigger=1287821

batgrbproduct Analysis for Trigger=1287821

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 21:36:31 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1287821
======================================================================

  Trigger: 01287821      Segment: 000

  BAT Trigger Time: 760583802.368   [s; MET]
      Trigger Stop: 760583803.392   [s; MET]
               UTC: 2025-02-07T01:16:07.335260    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 16.1147840004549   Dec: -12.1587242122474  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.23
     Image Trigger?:     NO
     Rate S/N Ratio:     34.5253530032641  [ if not an image trigger ]
     Image S/N Ratio:    14.23

  Flight Position:   [ source = BAT ]
    RA: 16.1147840004549   Dec: -12.1587242122474  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 16.1002914164675   Dec: -12.1630225311623  [deg; J2000]  
        { 01h 04m 24.1s , -12d 09' 46.9" }
         +/- 0.713524010641872 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.20572868099719 [arcmin] (formal 1-sigma fit error)
    SNR: 49.2645678004417
 
  Angular difference between Flight and Ground position is 0.888304 arcmin
 
  Partial Coding Fraction: 0.7265625    [ including projection effects ]

  Duration
     T90: 41.2119998931885 +/- 16.4965805732257
        Measured from: -3.66400003433228
                   to: 37.5479998588562     [s; relative to TRIGTIME]
     T50: 10.3439999818802 +/- 0.829891554331643
        Measured from: 1.29199993610382
                   to: 11.635999917984     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.92799997329712     
                   to: 7.92799997329712     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -6.72399997711182     
                   to: 63.2999999523163     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.243953   1.723195   1.794203   0.614023
           0.060383   0.064384   0.057107   0.047977 [error]
 Peak      0.063317   0.121637   0.122077   0.029037
           0.009084   0.010118   0.009428   0.007369 [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 3.66e-07 7.84e-07 1.32e-06 5.12e-06 3.64e-06 7.56e-06   erg/cm2
              Error 2.93e-08 3.64e-08 5.58e-08 5.14e-07 1.42e-07 5.36e-07   erg/cm2
Peak flux Power-law 7.01e-01 8.52e-01 7.51e-01 1.14e+00 2.70e+00 3.44e+00   ph/cm2/s
              Error 1.15e-01 8.77e-02 7.17e-02 2.23e-01 2.42e-01 3.09e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.66e-07 7.84e-07 1.30e-06 5.34e-06 3.65e-06 7.63e-06   erg/cm2
              Error 2.94e-08 3.64e-08 5.59e-08 3.57e-07 1.42e-07 6.43e-07   erg/cm2
Peak flux Cutoff-PL 5.63e-01 9.14e-01 8.34e-01 4.91e-01 2.62e+00 2.80e+00   ph/cm2/s
              Error 1.43e-01 1.04e-01 9.28e-02 2.85e-01 2.51e-01 3.74e-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    1.246    0.070    -      -           5.19e-03 1.93e-04   65.360 57
CPL   1.242    0.123    9999.1    0.0      5.21e-03 4.71e-04   65.430 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.182    0.141    -      -           2.31e-02 1.99e-03   61.830 57
CPL   0.212    0.740     100.4   61.9      6.58e-02 6.02e-02   55.410 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: 20.288000 sec.
T50 in the 50-300 keV band: 8.704000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   70.024   -6.724   63.300
T90    41.212   -3.664   37.548
T50    10.344    1.292   11.636
Peak    1.000    6.928    7.928

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
   16.1003   -12.1630   0.0039    35.4143  -171.1766         4.1439243     49.265 TRIG_01287821                 
 
Foreground time interval of the image:
 -6.724  11.533 (delta_t =  18.257 [sec])
Background time interval of the image:
-239.368  -6.724 (delta_t = 232.644 [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   -6.724 sec. to   63.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24590     ( -0.0704296   0.0699465 )
Norm@50keV  : 5.18801E-03    ( -0.000193623   0.000193268 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.36     using 59 bins.
 Reduced chi-squared = 1.14667
# Null hypothesis probability of 2.09e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 70.02 sec: 0.613199 ( -0.024832  0.024983 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.63992e-06 ( -1.41499e-07  1.4165e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -6.724 sec. to   63.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24154     ( -0.12908   0.116867 )
Epeak [keV] : 9999.06      ( -9999.08 -9999.08 )
Norm@50keV  : 5.21118E-03    ( -0.000191934   0.000750022 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.43     using 59 bins.
 Reduced chi-squared = 1.16839
# Null hypothesis probability of 1.82e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 70.02 sec: 0.613041 ( -0.013297  0.024941 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.64991e-06 ( -1.52457e-07  1.30613e-07 ) ergs/cm2

Band function

Time interval is from   -6.724 sec. to   63.300 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]    : 20.9543  (  )
R^2/D10^2   : 2.32140E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  243.20     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.52e-25 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.350e-07   1.054e-08
25- 50  6.928e-07   4.226e-08
50-150  2.267e-06   1.313e-07
15-150  3.095e-06   1.404e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.362       (      )
Norm        : 2.61151       (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  136.56     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.77e-08 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.553e-07   1.856e-08
25- 50  8.759e-07   3.851e-08
50-150  1.921e-06   7.807e-08
15-150  3.252e-06   1.393e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.37950        (-0.832455      0.992015)
R1^2/D10^2  : 0.802088        (-0.333422      0.592966)
kT2 [keV]   : 30.9558        (-2.96752      3.97205)
R2^2/D10^2  : 5.81512E-03    (-0.00186576   0.00228336)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.30     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.61e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.898e-07   5.665e-08
25- 50  7.489e-07   6.379e-08
50-150  2.543e-06   2.115e-07
15-150  3.682e-06   2.850e-07

Peak spectrum fit

Power-law model

Time interval is from    6.928 sec. to    7.928 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.18194     ( -0.141947   0.139735 )
Norm@50keV  : 2.30722E-02    ( -0.00199454   0.00199365 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.83     using 59 bins.
 Reduced chi-squared = 1.08474
# Null hypothesis probability of 3.08e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.70154 ( -0.24224  0.24275 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35315e-07 ( -2.17304e-08  2.18371e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    6.928 sec. to    7.928 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.211964     ( -0.807836   0.672645 )
Epeak [keV] : 100.404      ( -23.4447 100.376 )
Norm@50keV  : 6.58383E-02    ( -0.0334982   0.0868745 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.41     using 59 bins.
 Reduced chi-squared = 0.989464
# Null hypothesis probability of 4.97e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.61571 ( -0.25182  0.25086 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.24554e-07 ( -2.38158e-08  2.3605e-08 ) ergs/cm2

Band function

Time interval is from    6.928 sec. to    7.928 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]    : 18.5200  (-1.74108  2.00633)
R^2/D10^2   : 0.167848  (-0.0495264   0.0668514)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.94     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.20e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.142e-08   1.912e-09
25- 50  5.393e-08   7.315e-09
50-150  1.352e-07   2.055e-08
15-150  2.005e-07   1.965e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-19.0267      -200)
Norm        : 11.3044       (-0.996607     0.996607)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   77.84     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.48e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.816e-08   3.215e-09
25- 50  5.416e-08   1.307e-08
50-150  1.188e-07   5.291e-08
15-150  2.011e-07   5.765e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 14.7293        (-4.48368      2.31909)
R1^2/D10^2  : 0.304689        (-0.124713      0.360723)
kT2 [keV]   : 200.000        (-173.203      -200)
R2^2/D10^2  : 2.65105E-04    (-0.000118784   8.46849e-05)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.34     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.38e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.446e-08   4.096e-09
25- 50  5.709e-08   1.934e-08
50-150  1.517e-07   6.913e-08
15-150  2.233e-07   8.187e-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: 1.17748     ( -0.0572356   0.0568569 )
Norm@50keV  : 1.51598E-02    ( -0.000476267   0.000475087 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.47     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.88e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 18.26 sec: 1.77402 ( -0.059814  0.060027 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82661e-06 ( -9.09105e-08  9.10329e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.08676     ( -0.237338   0.0796068 )
Epeak [keV] : 559.721      ( -738.982 -976.623 )
Norm@50keV  : 1.65750E-02    ( -0.0021177   0.00386637 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.60     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.54e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 18.26 sec: 1.77395 ( -0.07091  0.03015 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.82124e-06 ( -9.37834e-08  9.48972e-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)  = 7.84e-07
S(50-100 keV) = 1.32e-06

T90 vs. Hardness ratio plot

T90                                   = 41.2119998931885 sec.
Hardness ratio (energy fluence ratio) = 1.68367

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.38526
Count Ratio (50-100 keV) / (15-25 keV) = 1.44234

Mask shadow pattern

IMX = -7.026230838911420E-01, IMY = 1.090655754059929E-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:
-239.368000 -6.724000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5609  35.2228    2.1  56.0  -26.6   8.5318   5.6    1.9	Cyg X-1                       
308.1134  40.9491   20.3  49.5  -19.0   0.4194   0.6    0.3	Cyg X-3                       
326.1068  38.2418    5.5  35.5  -17.8   0.9257   2.1    5.7	Cyg X-2                       
 46.6431  19.4289    3.0  42.3  116.9   7.2258   3.9 ------	UNKNOWN                       
302.8978  47.9533    2.5  54.3  -10.9   4.1086   4.6 ------	UNKNOWN                       
348.3971 -12.1864    2.6  34.9 -123.2   2.3875   4.4 ------	UNKNOWN

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

Time interval of the image:
-6.724000 11.532610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6526  35.2904    6.0  55.9  -26.5  -0.6228  -1.9    6.1	Cyg X-1                       
308.0891  40.9930    6.2  49.6  -18.9   0.2992   1.9    2.6	Cyg X-3                       
326.3053  38.3494    5.2  35.4  -17.5  -0.1945  -2.2    6.5	Cyg X-2                       
 33.0361  57.7292    2.8  44.0   57.6   1.2802   4.1 ------	UNKNOWN                       
 39.1593  32.9429    2.1  35.7   95.2   0.9366   5.6 ------	UNKNOWN                       
 16.1003 -12.1630    0.2  35.4 -171.2   4.1437  49.3 ------	UNKNOWN                       
 12.8693 -12.8790    2.1  34.9 -165.6   0.4310   5.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
93.932600 846.532600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 17.5755  24.9219    2.6  37.1   12.6   6.0173   4.4 ------	UNKNOWN                       
341.2695  -8.4135    2.4  34.5  -76.8   8.2315   4.8 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:52:04 EDT 2025