batgrbproduct analysis for trigger=1048783

batgrbproduct Analysis for Trigger=1048783

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): Fri Jul 29 23:12:45 EDT 2022
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1048783
======================================================================

  Trigger: 01048783      Segment: 000

  BAT Trigger Time: 642922108.608   [s; MET]
      Trigger Stop: 642922109.12   [s; MET]
               UTC: 2021-05-17T05:28:01.576140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 358.174322965366   Dec: -39.1049197741364  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.47
     Image Trigger?:     NO
     Rate S/N Ratio:     19.5192212959431  [ if not an image trigger ]
     Image S/N Ratio:    8.47

  Flight Position:   [ source = BAT ]
    RA: 358.174322965366   Dec: -39.1049197741364  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 358.189512339052   Dec: -39.1041292051999  [deg; J2000]  
        { 23h 52m 45.5s , -39d 06' 14.9" }
         +/- 2.04583340293305 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.910817769464141 [arcmin] (formal 1-sigma fit error)
    SNR: 10.9400171080399
 
  Angular difference between Flight and Ground position is 0.708803 arcmin
 
  Partial Coding Fraction: 0.7890625    [ including projection effects ]

  Duration
     T90: 3.05600011348724 +/- 1.39942853899308
        Measured from: -0.104000091552734
                   to: 2.95200002193451     [s; relative to TRIGTIME]
     T50: 0.991999983787537 +/- 0.329848430388928
        Measured from: 0.184000015258789
                   to: 1.17599999904633     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.180000066757202     
                   to: 0.819999933242798     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.167999982833862     
                   to: 3.12799990177155     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.112409   0.117755   0.060834   0.011695
           0.014223   0.014726   0.011835   0.010065 [error]
 Peak      0.061756   0.083627   0.035187   0.012114
           0.008642   0.009105   0.007313   0.005845 [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 2.92e-08 4.32e-08 4.81e-08 1.00e-07 1.51e-07 2.21e-07   erg/cm2
              Error 5.92e-09 6.28e-09 1.11e-08 4.59e-08 2.63e-08 5.81e-08   erg/cm2
Peak flux Power-law 5.80e-01 4.95e-01 2.88e-01 2.51e-01 1.47e+00 1.61e+00   ph/cm2/s
              Error 1.14e-01 6.86e-02 5.74e-02 9.34e-02 2.04e-01 2.27e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.75e-08 4.85e-08 4.61e-08 2.49e-08 1.38e-07 1.47e-07   erg/cm2
              Error 6.45e-09 8.93e-09 1.38e-08 -------- 2.90e-08 6.57e-08   erg/cm2
Peak flux Cutoff-PL 4.46e-01 6.41e-01 2.83e-01 2.46e-02 1.39e+00 1.39e+00   ph/cm2/s
              Error 1.41e-01 1.08e-01 7.73e-02 4.34e-02 2.08e-01 2.10e-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    1.852    0.253    -      -           4.98e-03 8.62e-04   67.730 57
CPL   0.979    1.193      48.4  -16.0      1.61e-02 5.75e-02   65.500 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.779    0.224    -      -           1.08e-02 1.69e-03   68.470 57
CPL  -0.650    1.707      46.3    8.8      2.56e-01 1.72e+00   58.240 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100    3.296   -0.168    3.128
T90     3.056   -0.104    2.952
T50     0.992    0.184    1.176
Peak    1.000   -0.180    0.820

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
  358.1895   -39.1041   0.0174    17.6795    59.1062         0.3035949     10.940 TRIG_01048783                 
 
Foreground time interval of the image:
 -0.168   3.128 (delta_t =   3.296 [sec])
Background time interval of the image:
-239.608  -0.168 (delta_t = 239.440 [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 0.512000

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 0.512000

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 0.512000

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   -0.168 sec. to    3.128 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.85241     ( -0.246014   0.260135 )
Norm@50keV  : 4.98189E-03    ( -0.000872253   0.000851568 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.73     using 59 bins.
 Reduced chi-squared = 1.18825
# Null hypothesis probability of 1.56e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 3.296 sec: 0.700981 ( -0.101592  0.101609 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.51004e-07 ( -2.59842e-08  2.66431e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.168 sec. to    3.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.979100     ( -1.40894   0.976657 )
Epeak [keV] : 48.3822      ( -16.4716 -48.3825 )
Norm@50keV  : 1.61425E-02    ( -0.016142   0.098804 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.50     using 59 bins.
 Reduced chi-squared = 1.16964
# Null hypothesis probability of 1.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 3.296 sec: 0.684401 ( -0.102988  0.10317 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38385e-07 ( -2.80613e-08  2.99787e-08 ) ergs/cm2

Band function

Time interval is from   -0.168 sec. to    3.128 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]    : 10.0707  (-1.55124  1.91192)
R^2/D10^2   : 0.331191  (-0.160952   0.294388)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.45e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.260e-08   5.392e-09
25- 50  5.675e-08   1.172e-08
50-150  3.023e-08   1.129e-08
15-150  1.096e-07   2.332e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 81.4003       (-30.1176      67.5394)
Norm        : 3.31426       (-0.644722     0.83241)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.71     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.01e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.838e-08   5.127e-09
25- 50  4.691e-08   8.734e-09
50-150  6.698e-08   3.732e-08
15-150  1.423e-07   4.403e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.07062        (-2.13151      2.17893)
R1^2/D10^2  : 0.939022        (-0.559522      2.0902)
kT2 [keV]   : 24.0049        (-17.2791      33.4605)
R2^2/D10^2  : 7.71556E-03    (-0.00744118   0.0588926)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.62     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.99e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.771e-08   1.569e-08
25- 50  4.951e-08   2.607e-08
50-150  6.802e-08   3.813e-08
15-150  1.452e-07   7.571e-08

Peak spectrum fit

Power-law model

Time interval is from   -0.180 sec. to    0.820 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.77938     ( -0.218147   0.229124 )
Norm@50keV  : 1.07693E-02    ( -0.0017041   0.00167544 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.47     using 59 bins.
 Reduced chi-squared = 1.20123
# Null hypothesis probability of 1.42e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.47237 ( -0.20413  0.20417 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.92385e-08 ( -1.58761e-08  1.61573e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.180 sec. to    0.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.650391     ( -1.98061   1.43356 )
Epeak [keV] : 46.2521      ( -6.3817 11.1353 )
Norm@50keV  : 0.256358    ( -0.270148   3.16881 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.24     using 59 bins.
 Reduced chi-squared = 1.04
# Null hypothesis probability of 3.93e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.39211 ( -0.2078  0.2086 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.4598e-08 ( -1.43183e-08  1.63319e-08 ) ergs/cm2

Band function

Time interval is from   -0.180 sec. to    0.820 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]    : 11.5414  (-1.3713  1.56943)
R^2/D10^2   : 0.452652  (-0.173791   0.271496)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.76     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.11e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.270e-08   2.966e-09
25- 50  3.814e-08   6.855e-09
50-150  2.974e-08   9.515e-09
15-150  8.058e-08   1.411e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 91.4229       (-31.2107      66.7425)
Norm        : 6.81922       (-1.18149     1.43094)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   63.90     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.47e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.780e-08   3.360e-09
25- 50  3.021e-08   5.080e-09
50-150  4.645e-08   2.495e-08
15-150  9.446e-08   2.828e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 1.21497        (-2.21602      84.3998)
R1^2/D10^2  : 3.08068E+04        (-33127.9      -33127.9)
kT2 [keV]   : 11.8377        (-1.46946      2.65046)
R2^2/D10^2  : 0.404741    (-0.405214   0.220815)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.33     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.89e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.409e-08   4.267e-09
25- 50  3.654e-08   1.133e-08
50-150  3.162e-08   1.223e-08
15-150  8.226e-08   2.006e-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: 1.85241     ( -0.246014   0.260135 )
Norm@50keV  : 4.98189E-03    ( -0.000872253   0.000851568 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   67.73     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.56e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 3.296 sec: 0.700941 ( -0.101586  0.101602 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50976e-07 ( -2.59632e-08  2.66625e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.979118     ( -1.40894   0.976655 )
Epeak [keV] : 48.3825      ( -16.4717 -48.3825 )
Norm@50keV  : 1.61421E-02    ( -0.016142   0.0988039 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.50     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.80e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 3.296 sec: 0.684285 ( -0.10296  0.101605 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.38421e-07 ( -2.80707e-08  3.0013e-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)  = 4.32e-08
S(50-100 keV) = 4.81e-08

T90 vs. Hardness ratio plot

T90                                   = 3.05600011348724 sec.
Hardness ratio (energy fluence ratio) = 1.11343

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.04756
Count Ratio (50-100 keV) / (15-25 keV) = 0.541184

Mask shadow pattern

IMX = 1.636593379262233E-01, IMY = -2.735224024754572E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 0.512000

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:
-239.608000 -0.168000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 42.3231 -65.0125    3.5  50.1   26.4   3.5501   3.3 ------	UNKNOWN                       
318.6359  -4.6968    2.8  46.2  152.1   2.7202   4.1 ------	UNKNOWN                       
 28.3906  -6.4829    2.7  29.0  -71.4   1.5877   4.3 ------	UNKNOWN

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

Time interval of the image:
-0.168000 3.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
358.1895 -39.1041    1.0  17.7   59.1   0.3036  10.9 ------	UNKNOWN                       
341.9549  31.7016    2.2  57.2 -154.4   0.5603   5.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
50.892590 962.452000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
322.8268   6.9284    2.7  56.5  173.6  15.7234   4.3 ------	UNKNOWN                       
 80.2454 -47.0264    3.1  57.7  -15.8  11.7771   3.7 ------	UNKNOWN                       
341.8970  15.9558    3.0  57.1 -161.5  13.1687   3.9 ------	UNKNOWN                       
359.0919  11.1470    3.7  50.3 -141.7   7.2871   3.1 ------	UNKNOWN                       
 10.6898   6.1884    3.1  46.7 -125.6  11.2863   3.7 ------	UNKNOWN

Plot creation:
Sat Jul 30 07:00:33 EDT 2022