batgrbproduct analysis for trigger=1231488

batgrbproduct Analysis for Trigger=1231488

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): Sat Nov 16 12:06:18 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1231488
======================================================================

  Trigger: 01231488      Segment: 000

  BAT Trigger Time: 738644344.32   [s; MET]
      Trigger Stop: 738644345.344   [s; MET]
               UTC: 2024-05-29T02:58:30.788060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 335.321551571704   Dec: 51.5552654293351  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.12
     Image Trigger?:     NO
     Rate S/N Ratio:     25.2388589282479  [ if not an image trigger ]
     Image S/N Ratio:    11.12

  Flight Position:   [ source = BAT ]
    RA: 335.321551571704   Dec: 51.5552654293351  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 335.340496218476   Dec: 51.5573055046231  [deg; J2000]  
        { 22h 21m 21.7s , +51d 33' 26.3" }
         +/- 0.870606769881079 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.352974617273414 [arcmin] (formal 1-sigma fit error)
    SNR: 37.0754895626986
 
  Angular difference between Flight and Ground position is 0.717247 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 158.971999883652 +/- 12.9762226866818
        Measured from: -37.0520000457764
                   to: 121.919999837875     [s; relative to TRIGTIME]
     T50: 65.2400000095367 +/- 1.35625963921704
        Measured from: -11.4680000543594
                   to: 53.7719999551773     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.167999982833862     
                   to: 1.16799998283386     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -70.9160000085831     
                   to: 227.451999902725     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     8.819169  11.500703   8.864284   2.816632
           0.178972   0.192749   0.175111   0.156538 [error]
 Peak      0.196038   0.307450   0.279123   0.109869
           0.019487   0.023152   0.021851   0.017481 [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 3.10e-06 5.34e-06 7.04e-06 1.89e-05 2.06e-05 3.43e-05   erg/cm2
              Error 1.46e-07 1.43e-07 1.92e-07 1.21e-06 4.70e-07 1.29e-06   erg/cm2
Peak flux Power-law 2.41e+00 2.54e+00 1.90e+00 2.29e+00 7.73e+00 9.14e+00   ph/cm2/s
              Error 3.34e-01 2.21e-01 1.76e-01 4.30e-01 6.26e-01 7.20e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.10e-06 5.34e-06 7.01e-06 1.94e-05 2.06e-05 3.49e-05   erg/cm2
              Error -------- 1.70e-07 2.71e-07 1.73e-06 5.31e-07 2.20e-06   erg/cm2
Peak flux Cutoff-PL 2.26e+00 2.62e+00 1.97e+00 1.66e+00 7.65e+00 8.51e+00   ph/cm2/s
              Error 3.97e-01 2.54e-01 2.10e-01 7.29e-01 6.35e-01 1.01e+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    1.604    0.044    -      -           7.39e-03 1.64e-04   61.250 57
CPL   1.602    0.092    9998.1    0.0      7.40e-03 6.33e-04   61.260 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.422    0.129    -      -           6.31e-02 4.94e-03   58.180 57
CPL   1.105    0.457     150.7  -43.1      9.00e-02 5.06e-02   56.920 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: 122.560000 sec.
T50 in the 50-300 keV band: 43.264000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  298.368  -70.916  227.452
T90   158.972  -37.052  121.920
T50    65.240  -11.468   53.772
Peak    1.000    0.168    1.168

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  335.3405    51.5573   0.0052    48.1586  -151.9850        16.4036322     37.075 TRIG_01231488                 
 
Foreground time interval of the image:
-37.219  16.381 (delta_t =  53.600 [sec])
Background time interval of the image:

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  -70.916 sec. to  227.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.60396     ( -0.0439333   0.0440338 )
Norm@50keV  : 7.38710E-03    ( -0.000164388   0.000164387 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.25     using 59 bins.
 Reduced chi-squared = 1.07456
# Null hypothesis probability of 3.26e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 298.4 sec: 0.950477 ( -0.024867  0.024981 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06081e-05 ( -4.70478e-07  4.70326e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -70.916 sec. to  227.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.60168     ( -0.139923   0.0443068 )
Epeak [keV] : 9998.06      ( -9998.47 -9998.47 )
Norm@50keV  : 7.40469E-03    ( -0.000164768   0.001102 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   61.26     using 59 bins.
 Reduced chi-squared = 1.09393
# Null hypothesis probability of 2.93e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 298.4 sec: 0.953303 ( -0.038457  0.030165 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06518e-05 ( -6.6525e-07  3.97024e-07 ) ergs/cm2

Band function

Time interval is from  -70.916 sec. to  227.452 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]    : 16.5199  (  )
R^2/D10^2   : 7.06463E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  540.52     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.14e-80 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.181e-06   5.550e-08
25- 50  5.103e-06   1.671e-07
50-150  9.849e-06   3.596e-07
15-150  1.613e-05   3.969e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-18.454      -200)
Norm        : 3.78884       (-0.0844122     0.0844123)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   73.61     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.85e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.816e-06   7.281e-08
25- 50  5.417e-06   1.343e-07
50-150  1.188e-05   3.118e-07
15-150  2.012e-05   5.431e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.61695        (-0.64989      0.693537)
R1^2/D10^2  : 0.767923        (-0.198451      0.290561)
kT2 [keV]   : 29.8377        (-2.69531      3.50558)
R2^2/D10^2  : 7.03015E-03    (-0.00224213   0.0028529)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   84.61     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.31e-03 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.605e-06   2.077e-07
25- 50  5.514e-06   2.298e-07
50-150  1.220e-05   7.385e-07
15-150  2.032e-05   8.475e-07

Peak spectrum fit

Power-law model

Time interval is from    0.168 sec. to    1.168 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42166     ( -0.128547   0.128931 )
Norm@50keV  : 6.31156E-02    ( -0.00494287   0.00493576 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.18     using 59 bins.
 Reduced chi-squared = 1.0207
# Null hypothesis probability of 4.32e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 7.72510 ( -0.62524  0.62614 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.07309e-07 ( -5.11871e-08  5.13945e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.168 sec. to    1.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.10546     ( -0.534364   0.379958 )
Epeak [keV] : 150.699      ( -64.5153 -150.7 )
Norm@50keV  : 8.99989E-02    ( -0.0301849   0.0710592 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.92     using 59 bins.
 Reduced chi-squared = 1.01643
# Null hypothesis probability of 4.41e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 7.65274 ( -0.63516  0.63564 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.99639e-07 ( -5.35292e-08  5.31007e-08 ) ergs/cm2

Band function

Time interval is from    0.168 sec. to    1.168 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]    : 16.4408  (-1.63435  1.84062)
R^2/D10^2   : 0.659313  (-0.203669   0.289626)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   95.58     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.04e-03 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.661e-08   5.310e-09
25- 50  1.576e-07   1.695e-08
50-150  3.008e-07   4.560e-08
15-150  4.951e-07   4.750e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-30.8008      -200)
Norm        : 32.1507       (-2.50861     2.50861)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.34     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.56e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  8.008e-08   7.800e-09
25- 50  1.540e-07   2.270e-08
50-150  3.378e-07   1.234e-07
15-150  5.719e-07   9.260e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 8.15788        (-2.02742      2.38746)
R1^2/D10^2  : 4.78660        (-2.57167      7.05535)
kT2 [keV]   : 31.3443        (-7.70901      20.0223)
R2^2/D10^2  : 5.49466E-02    (-0.043444   0.0579648)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.36     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.24e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.664e-08   2.317e-08
25- 50  1.573e-07   4.085e-08
50-150  3.811e-07   1.812e-07
15-150  6.051e-07   2.171e-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: 1.42955     ( -0.0499788   0.0499026 )
Norm@50keV  : 2.19831E-02    ( -0.000592903   0.000592631 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.02     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.67e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 53.6 sec: 2.69564 ( -0.0822291  0.0826486 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.13189e-05 ( -3.13526e-07  3.13721e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.42779     ( -0.270677   0.0486277 )
Epeak [keV] : 9342.79      ( -9079.3 -9079.3 )
Norm@50keV  : 2.20673E-02    ( -0.000597487   0.00674286 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.99     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.33e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 53.6 sec: 2.68337 ( -0.08949  0.045 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.12911e-05 ( -3.30819e-07  3.29426e-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)  = 5.34e-06
S(50-100 keV) = 7.04e-06

T90 vs. Hardness ratio plot

T90                                   = 158.971999883652 sec.
Hardness ratio (energy fluence ratio) = 1.31835

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.30406
Count Ratio (50-100 keV) / (15-25 keV) = 1.00512

Mask shadow pattern

IMX = -9.859501710022455E-01, IMY = 5.245699676983058E-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:

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

Time interval of the image:
-37.219410 16.380600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.8613  11.1571    0.0  42.5  127.2   0.3992   0.8   13.2	GRS 1915+105                  
299.6300  35.1838    3.1  43.0  165.8   1.3180   3.8    2.2	Cyg X-1                       
308.2321  41.0091    6.4  42.7  178.9   0.5603   1.8    6.5	Cyg X-3                       
326.1144  38.2094   45.1  35.0 -162.4  -0.0518  -0.3    7.3	Cyg X-2                       
346.8636 -47.3994    3.1  52.8   11.1   1.7508   3.8 ------	UNKNOWN                       
  0.8108 -35.6424    2.5  48.0   -8.3   1.2137   4.6 ------	UNKNOWN                       
 13.6209 -33.2493    4.6  54.4  -19.5   1.0496   2.5 ------	UNKNOWN                       
344.2351  36.1665    2.4  34.8 -136.8   1.2162   4.8 ------	UNKNOWN                       
335.3405  51.5573    0.3  48.2 -152.0  16.4024  37.1 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
107.180670 962.780600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5610  35.2195    1.1  30.3   86.4  14.2034  10.3    1.8	Cyg X-1                       
308.2004  40.9485   17.5  21.4   85.9  -0.6062  -0.7    4.1	Cyg X-3                       
325.9234  38.4061    0.0  14.7   45.3   1.1638   1.8   12.7	Cyg X-2                       
304.4402  43.0770    2.9  22.4   94.9   3.7764   4.0 ------	UNKNOWN                       
335.1454  29.4769    2.1  22.1   15.4   3.7741   5.5 ------	UNKNOWN                       
286.7340  74.9237    2.5  30.3  172.2   3.7026   4.6 ------	UNKNOWN                       
324.9970  64.6742    2.6  14.2  176.6   2.9484   4.5 ------	UNKNOWN                       
335.5604  51.5770    2.3   0.1  -84.5   3.6057   4.9 ------	UNKNOWN                       
286.6107  88.4444    2.1  37.4 -167.0   4.7705   5.4 ------	UNKNOWN                       
  2.8309  73.5890    2.7  24.9 -147.0   3.0187   4.2 ------	UNKNOWN                       
142.3827  70.9059    2.2  57.2 -160.1  16.7461   5.3 ------	UNKNOWN                       
 60.9783  61.3360    2.3  44.8 -122.3  15.3820   5.0 ------	UNKNOWN                       
 28.8494  33.5595    2.2  42.2  -71.3  14.3838   5.1 ------	UNKNOWN

Plot creation:
Sat Nov 16 12:25:31 EST 2024