batgrbproduct analysis for trigger=1328546
batgrbproduct Analysis for Trigger=1328546
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): Sat Jun 28 23:44:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1328546/GCN5_download_cron
======================================================================
Trigger: 01328546 Segment: 000
BAT Trigger Time: 772764992.576 [s; MET]
Trigger Stop: 772764994.624 [s; MET]
UTC: 2025-06-28T00:55:56.711100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.5513336152956 Dec: -38.0807787742637 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.16
Image Trigger?: NO
Rate S/N Ratio: 12.369316876853 [ if not an image trigger ]
Image S/N Ratio: 9.16
Flight Position: [ source = BAT ]
RA: 38.5513336152956 Dec: -38.0807787742637 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.5387828787169 Dec: -38.0817418854562 [deg; J2000]
{ 02h 34m 09.3s , -38d 04' 54.3" }
+/- 1.5487114418183 [arcmin] (estimated 90% radius based on SNR)
+/- 0.648957679447323 [arcmin] (formal 1-sigma fit error)
SNR: 16.2829069675107
Angular difference between Flight and Ground position is 0.595559 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 64.0119999647141 +/- 11.0437936361266
Measured from: -7.61199986934662
to: 56.4000000953674 [s; relative to TRIGTIME]
T50: 43.0039999485016 +/- 2.63763309491728
Measured from: -0.127999901771545
to: 42.87600004673 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0959999561309814
to: 0.904000043869019 [s; relative to TRIGTIME]
Total Fluence
Measured from: -9.42400002479553
to: 68.5600000619888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.142215 1.338074 0.682310 0.100281
0.072991 0.076005 0.063274 0.051401 [error]
Peak 0.041119 0.053003 0.047160 0.009506
0.009614 0.010129 0.008743 0.006025 [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 4.11e-07 5.60e-07 5.62e-07 1.02e-06 1.86e-06 2.56e-06 erg/cm2
Error 4.12e-08 3.77e-08 6.10e-08 2.22e-07 1.42e-07 2.85e-07 erg/cm2
Peak flux Power-law 4.97e-01 4.06e-01 2.25e-01 1.83e-01 1.21e+00 1.31e+00 ph/cm2/s
Error 1.46e-01 8.27e-02 6.34e-02 9.65e-02 2.48e-01 2.65e-01 ph/cm2/s
Fluence Cutoff-PL 3.84e-07 6.02e-07 5.56e-07 3.84e-07 1.76e-06 1.93e-06 erg/cm2
Error 4.66e-08 5.12e-08 6.89e-08 3.24e-07 1.62e-07 3.63e-07 erg/cm2
Peak flux Cutoff-PL 4.18e-01 4.56e-01 2.52e-01 7.62e-02 1.18e+00 1.20e+00 ph/cm2/s
Error 1.75e-01 1.06e-01 7.93e-02 8.74e-02 2.52e-01 2.70e-01 ph/cm2/s
Fluence Band 3.69e-07 6.11e-07 5.30e-07 7.81e-07 1.79e-06 2.30e-06 erg/cm2
Error 5.03e-08 -------- 6.68e-08 2.41e-07 1.48e-07 3.02e-07 erg/cm2
Peak flux Band 4.36e-01 4.44e-01 2.51e-01 1.01e-01 1.20e+00 1.23e+00 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 1.993 0.124 - - 2.59e-03 2.06e-04 63.970 57
CPL 1.363 0.549 43.9 15.4 5.85e-03 4.71e-03 59.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.854 0.329 - - 8.59e-03 1.93e-03 57.340 57
CPL 0.787 1.523 56.9 -3.3 3.04e-02 1.22e-01 55.360 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: 52.288000 sec.
T50 in the 50-300 keV band: 41.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 77.984 -9.424 68.560
T90 64.012 -7.612 56.400
T50 43.004 -0.128 42.876
Peak 1.000 -0.096 0.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.5388 -38.0817 0.0118 37.6 14.7 1.8044 16.3 TRIG_01328546
------------------------------------------
Foreground time interval of the image:
-9.424 27.425 (delta_t = 36.849 [sec])
Background time interval of the image:
-239.576 -9.424 (delta_t = 230.152 [sec])
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
Time interval is from -9.424 sec. to 68.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99308 ( -0.121805 0.125571 )
Norm@50keV : 2.59074E-03 ( -0.000207703 0.000205008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 57 degrees of freedom
# Null hypothesis probability = 2.451242e-01
Photon flux (15-150 keV) in 77.98 sec: 0.387381 ( -0.0266215 0.0266486 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8624e-06 ( -1.41887e-07 1.431e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -9.424 sec. to 68.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36328 ( -0.587792 0.510702 )
Epeak [keV] : 43.8948 ( -13.5253 17.2423 )
Norm@50keV : 5.84589E-03 ( -0.00277835 0.00664928 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 56 degrees of freedom
# Null hypothesis probability = 3.524359e-01
Photon flux (15-150 keV) in 77.98 sec: 0.377536 ( -0.027723 0.027735 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76346e-06 ( -1.60592e-07 1.62986e-07 ) ergs/cm2
Band function
Time interval is from -9.424 sec. to 68.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.96942 ( -5.49916 -4.04279 )
beta : -2.21405 ( -0.21808 0.185941 )
Epeak [keV] : 27.7355 ( -3.79787 3.07411 )
Norm@50keV : 1.63437 ( -1.63281 129.004 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.25 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.280000e-01
Photon flux (15-150 keV) in 77.98 sec: 0.374327 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79151e-06 ( -1.79097e-06 -1.47827e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2525 (-0.80918 0.883769)
R^2/D10^2 : 0.162826 (-0.0447065 0.061271)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.80 using 59 PHA bins.
# Reduced chi-squared = 1.733 for 57 degrees of freedom
# Null hypothesis probability = 4.976180e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.740e-07 3.197e-08
25- 50 7.054e-07 5.544e-08
50-150 3.956e-07 6.897e-08
15-150 1.375e-06 1.127e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.1822 (-12.8857 17.7605)
Norm : 1.90923 (-0.207368 0.237127)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.815e-07 3.412e-08
25- 50 6.050e-07 4.340e-08
50-150 7.703e-07 1.235e-07
15-150 1.757e-06 1.622e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.58449 (-1.19743 1.23296)
R1^2/D10^2 : 0.653655 (-0.285816 0.64646)
kT2 [keV] : 21.6447 (-5.06526 9.6028)
R2^2/D10^2 : 5.90450E-03 (-0.00444096 0.00745502)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.719e-07 9.143e-08
25- 50 6.128e-07 1.201e-07
50-150 7.899e-07 3.858e-07
15-150 1.775e-06 5.413e-07
Peak spectrum fit
Power-law model
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85427 ( -0.311855 0.346687 )
Norm@50keV : 8.58743E-03 ( -0.00196149 0.00190554 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.34 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 57 degrees of freedom
# Null hypothesis probability = 4.623932e-01
Photon flux (15-150 keV) in 1 sec: 1.20915 ( -0.247653 0.247992 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.8956e-08 ( -1.77196e-08 1.79239e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.786581 ( -1.77195 1.27326 )
Epeak [keV] : 56.8938 ( -50.3911 -56.901 )
Norm@50keV : 3.04118E-02 ( -0.030408 0.213233 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9885 for 56 degrees of freedom
# Null hypothesis probability = 4.991510e-01
Photon flux (15-150 keV) in 1 sec: 1.18218 ( -0.252238 0.25105 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.72462e-08 ( -1.81025e-08 1.83959e-08 ) ergs/cm2
Band function
Time interval is from -0.096 sec. to 0.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.791712 ( -1.19567 1.68347 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 56.9856 ( -18.515 -56.9856 )
Norm@50keV : 3.01995E-02 ( -0.0301996 0.213313 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.611347e-01
Photon flux (15-150 keV) in 1 sec: 1.19695 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.73353e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1734 (-2.8105 3.39459)
R^2/D10^2 : 0.218409 (-0.125331 0.303474)
(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 8.037e-09 3.219e-09
25- 50 2.808e-08 1.015e-08
50-150 3.104e-08 1.353e-08
15-150 6.715e-08 2.325e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.9453 (-42.3653 -95.9425)
Norm : 5.50113 (-1.33972 1.77054)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.437e-08 3.838e-09
25- 50 2.464e-08 7.380e-09
50-150 3.900e-08 2.635e-08
15-150 7.802e-08 3.144e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.21593 (-3.34397 5.82729)
R1^2/D10^2 : 8.09323 (-7.72803 3.67767)
kT2 [keV] : 16.6452 (-4.55124 11.2782)
R2^2/D10^2 : 7.98943E-02 (-0.0731132 0.205833)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.397e-08 7.915e-09
25- 50 2.367e-08 1.235e-08
50-150 3.880e-08 2.391e-08
15-150 7.645e-08 4.095e-08
Plot creation:
Sat Jun 28 23:48:22 EDT 2025