batgrbproduct analysis for trigger=1204595

batgrbproduct Analysis for Trigger=1204595

Analysis Summary

Notes:

1) No attempt has been made to eliminate the non-significant decimal places.
2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 15 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.48
    Process Start Time (local time): Wed Dec 27 00:16:18 EST 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/prebascript/trigger1204595/GCN5_download_cron
======================================================================

  Trigger: 01204595      Segment: 000

  BAT Trigger Time: 725261216   [s; MET]
      Trigger Stop: 725261432   [s; MET]
               UTC: 2023-12-26T05:26:23.384960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 245.079749627924   Dec: -15.8827401392319  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.61
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.61

  Flight Position:   [ source = BAT ]
    RA: 245.079749627924   Dec: -15.8827401392319  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 245.072927922347   Dec: -15.87866018336  [deg; J2000]  
        { 16h 20m 17.5s , -15d 52' 43.2" }
         +/- 2.62940087349167 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.44084685899063 [arcmin] (formal 1-sigma fit error)
    SNR: 7.64403993547361
 
  Angular difference between Flight and Ground position is 0.463584 arcmin
 
  Partial Coding Fraction: 0.1660156    [ including projection effects ]

  Duration
     T90: 424.384000062943 +/- 51.1035817256338
        Measured from: -131.431999921799
                   to: 292.952000141144     [s; relative to TRIGTIME]
     T50: 216.832000136375 +/- 38.8750778446745
        Measured from: -51.6719999313354
                   to: 165.16000020504     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 159.723999977112     
                   to: 160.723999977112     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -159.879999995232     
                   to: 327.463999986649     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     9.948081   2.350564   0.896854   0.230600
           0.336119   0.327173   0.280002   0.247735 [error]
 Peak      0.061288   0.049911   0.023963  -0.012903
           0.015614   0.015184   0.013545   0.012065 [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 3.82e-06 8.93e-07 1.07e-07 1.44e-08 4.83e-06 4.84e-06   erg/cm2
              Error 4.78e-07 2.33e-07 7.34e-08 1.85e-08 4.72e-07 4.72e-07   erg/cm2
Peak flux Power-law 7.32e-01 3.19e-01 8.28e-02 2.65e-02 1.15e+00 1.16e+00   ph/cm2/s
              Error 2.90e-01 1.21e-01 6.54e-02 2.86e-02 3.91e-01 3.92e-01   ph/cm2/s
 
Fluence   Cutoff-PL 3.83e-06 8.89e-07 1.06e-07 1.40e-08 4.83e-06 4.83e-06   erg/cm2
              Error 4.78e-07 -------- -------- -------- 4.72e-07 4.72e-07   erg/cm2
Peak flux Cutoff-PL 7.36e-01 3.19e-01 7.88e-02 2.35e-02 1.15e+00 1.15e+00   ph/cm2/s
              Error -------- -------- -------- 2.86e-02 -------- 3.99e-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    5.055    0.581    -      -           1.93e-04 1.02e-04   69.310 57
CPL   1.822    0.000       1.1    0.0      1.07e-01 0.00e+00   79.250 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.945    0.719    -      -           4.35e-03 2.30e-03   58.110 57
CPL   1.978    0.117       1.5   20.2      1.27e-02 0.00e+00   59.010 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  487.344 -159.880  327.464
T90   424.384 -131.432  292.952
T50   216.832  -51.672  165.160
Peak    1.000  159.724  160.724

Click here for the BAT GCN circular template

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

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  245.0729 -15.8787 0.0252   42.1  -58.3      12.2146     7.6  TRIG_01204595       
------------------------------------------
 
Foreground time interval of the image:
-147.699  23.840 (delta_t = 171.539 [sec])
 25.000 105.450 (delta_t =  80.450 [sec])
107.000 130.630 (delta_t =  23.630 [sec])
132.000 244.901 (delta_t = 112.901 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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)

Spectra

Notes:

1) The fitting includes the systematic errors.
2) For long bursts, a spectral fit of 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.
4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.

Time averaged spectrum fit using the pre-slew DRM

Power-law model

Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 5.05544     ( -0.572929   0.589818 )
Norm@50keV  : 1.92818E-04    ( -8.1148e-05   0.000122727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.31 using 59 PHA bins.
# Reduced chi-squared =          1.216 for     57 degrees of freedom 
# Null hypothesis probability =   1.270890e-01
 
Photon flux (15-150 keV)    in 483.3 sec: 0.313724 ( -0.0338148  0.0339817 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.83208e-06 ( -4.71884e-07  4.71886e-07 ) ergs/cm2

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.82156     (     )
Epeak [keV] : 1.08208      (   )
Norm@50keV  : 0.106679    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          79.25 using 59 PHA bins.
# Reduced chi-squared =          1.415 for     56 degrees of freedom 
# Null hypothesis probability =   2.213226e-02
 
Photon flux (15-150 keV)    in 483.3 sec: 0.313639 ( -0.033966  0.033728 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.83011e-06 ( -4.71696e-07  4.71696e-07 ) ergs/cm2

Band function

Multiple GTIs in the spectrum
tstart tstop
-159.880000 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 327.464000
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.91875   ( 9.91875   9.91875 )
beta        : -5.02792    ( -0.614412   0.550091 )
Epeak [keV] : 1.94310      ( -1.9431 -1.9431 )
Norm@50keV   : 2.68725E-02    ( -0.0115166   0.0162145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.31 using 59 PHA bins.
# Reduced chi-squared =          1.260 for     55 degrees of freedom 
# Null hypothesis probability =   9.275635e-02
 
Photon flux (15-150 keV)    in 483.3 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]    : 2.73575  (-0.273584  0.329819)
R^2/D10^2   : 79.5550  (-44.5981   98.6256)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          85.06 using 59 PHA bins.
# Reduced chi-squared =          1.492 for     57 degrees of freedom 
# Null hypothesis probability =   9.391409e-03
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.960e-06   1.069e-06
25- 50  4.135e-07   1.389e-07
50-150  3.036e-10   2.387e-10
15-150  4.374e-06   1.021e-06

Thermal bremsstrahlung (OTTB)

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 5.34870       (-0.862619      1.22376)
Norm        : 55.7233       (-28.4722     56.3461)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.910e-06   8.765e-07
25- 50  5.734e-07   1.618e-07
50-150  4.132e-09   3.037e-09
15-150  4.488e-06   8.533e-07

Double BB

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.32862        (-0.274896      0.305922)
R1^2/D10^2  : 243.095        (-148.572      427.951)
kT2 [keV]   : 12.6293        (-3.44389      5.8591)
R2^2/D10^2  : 1.51162E-02    (-0.0118092   0.0426346)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.033e-06   1.858e-06
25- 50  1.032e-06   4.832e-07
50-150  8.171e-07   5.550e-07
15-150  5.882e-06   2.257e-06

Peak spectrum fit

Power-law model

Time interval is from  159.724 sec. to  160.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.94477     ( -0.479399   0.958684 )
Norm@50keV  : 4.35167E-03    ( -0.00258905   0.00200337 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.11 using 59 PHA bins.
# Reduced chi-squared =          1.019 for     57 degrees of freedom 
# Null hypothesis probability =   4.342629e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.14994 ( -0.391006  0.390075 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.10013e-08 ( -1.84384e-08  1.7921e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  159.724 sec. to  160.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.97751     ( -0.216032   0.0185822 )
Epeak [keV] : 1.48099      ( -0.882991 39.492 )
Norm@50keV  : 1.26628E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.01 using 59 PHA bins.
# Reduced chi-squared =          1.054 for     56 degrees of freedom 
# Null hypothesis probability =   3.662295e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.15067 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.08337e-08 ( -1.80701e-08  1.95727e-08 ) ergs/cm2

Band function

Time interval is from  159.724 sec. to  160.724 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 4.01352   ( 1.39502   1.39502 )
beta        : -2.99300    ( 2.95577   0.487157 )
Epeak [keV] : 15.3836      ( -7.28801 538.195 )
Norm@50keV   : 6333.12    ( -6319.64   1.25773e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.96 using 59 PHA bins.
# Reduced chi-squared =          1.054 for     55 degrees of freedom 
# Null hypothesis probability =   3.666175e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 XSPEC: quit
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 3.60697  (-1.21997  3.15649)
R^2/D10^2   : 46.3002  (-46.3243   496.137)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.493e-08   1.454e-08
25- 50  6.633e-09   4.676e-09
50-150  4.172e-11   4.288e-11
15-150  3.161e-08   1.873e-08

Thermal bremsstrahlung (OTTB)

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 40.8279       (-40.8692      27.1127)
Norm        : 7.04688       (-3.26196     60.9995)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.629e-08   6.823e-09
25- 50  2.162e-08   9.185e-09
50-150  1.710e-08   1.047e-08
15-150  5.502e-08   2.471e-08

Double BB

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 2.91146        (-1.02448      1.53321)
R1^2/D10^2  : 132.280        (-120.435      2398.87)
kT2 [keV]   : 16.9195        (-5.84067      6.44997)
R2^2/D10^2  : 4.47551E-02    (-0.0385087   0.138917)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.309e-08   1.353e-08
25- 50  1.420e-08   9.425e-09
50-150  2.351e-08   1.837e-08
15-150  6.080e-08   3.442e-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: 4.87450     ( -0.6009   0.630234 )
Norm@50keV  : 2.34272E-04    ( -0.000103365   0.000157174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.28 using 59 PHA bins.
# Reduced chi-squared =          1.216 for     57 degrees of freedom 
# Null hypothesis probability =   1.274905e-01
 
Photon flux (15-150 keV)    in 388.5 sec: 0.320881 ( -0.035473  0.0356797 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.03255e-06 ( -4.11981e-07  4.13209e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00000     (     )
Epeak [keV] : 50.0000      (   )
Norm@50keV  : 3.52692E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =         181.80 using 59 PHA bins.
# Reduced chi-squared =         3.2465 for     56 degrees of freedom 
# Null hypothesis probability =   3.286217e-15
 
Photon flux (15-150 keV)    in 388.5 sec: 0.320720 ( -0.035519  0.035527 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.03065e-06 ( 0  0 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -9.78314   ( 9.78314   9.78314 )
beta        : -4.87562    ( -0.630435   0.601549 )
Epeak [keV] : 2.27198      ( -2.27198 -2.27198 )
Norm@50keV   : 3.18097E-02    ( -0.0140478   0.0213616 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.28 using 59 PHA bins.
# Reduced chi-squared =          1.260 for     55 degrees of freedom 
# Null hypothesis probability =   9.316366e-02
 
Photon flux (15-150 keV)    in 388.5 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)  = 8.93e-07
S(50-100 keV) = 1.07e-07

T90 vs. Hardness ratio plot

T90                                   = 424.384000062943 sec.
Hardness ratio (energy fluence ratio) = 0.119821

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.236283
Count Ratio (50-100 keV) / (15-25 keV) = 0.0901535

Mask shadow pattern

IMX = 4.748293818933887E-01, IMY = 7.681279334864578E-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:

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

Time interval of the image:
-147.699400 23.840000
25.000000 105.450000
107.000000 130.630000
132.000000 244.900600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9777 -15.8062    2.6  42.0  -58.2   6.9737   4.4   10.0	Sco X-1                       
254.5691  35.2289   10.2  15.7  179.2   0.5929   1.1    8.7	Her X-1                       
268.3753  -1.4008    7.9  38.8 -100.4  -2.8504  -1.4    3.1	SW J1753.5-0127               
288.7523  10.9654   15.0  48.4 -132.3  -1.7568  -0.8    3.0	GRS 1915+105                  
299.7379  35.3319   14.0  51.6 -166.6   1.1693   0.8   10.7	Cyg X-1                       
308.0967  40.9477    4.5  57.4 -174.5   6.4621   2.6    0.7	Cyg X-3                       
205.7313  41.8043    3.3  32.2   77.5   4.2240   3.5 ------	UNKNOWN                       
238.2078  55.1540    2.3  29.3  127.2   4.2087   5.0 ------	UNKNOWN                       
217.1646  30.8572    2.3  20.6   58.4   2.9665   4.9 ------	UNKNOWN                       
208.5568 -20.7351    2.1  55.7  -14.7   8.5875   5.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
347.100600 659.320000
661.000000 866.000000
867.000000 963.081100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4625 -60.6254    9.2  52.5   -8.9  -2.3486  -1.3    4.3	Cen X-3                       
186.7794 -62.8576    4.7  50.6  -18.8  -5.1756  -2.4    6.2	GX 301-2                      
245.0975 -15.8125    0.0  41.7 -108.9   7.1990   1.8   12.4	Sco X-1                       
170.9686  -3.4760    2.8  32.2   77.4   7.9419   4.1 ------	UNKNOWN

Plot creation:
Wed Dec 27 00:18:58 EST 2023