batgrbproduct analysis for trigger=1325580
batgrbproduct Analysis for Trigger=1325580
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 21 14:58:04 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1325580/batgroup_hand_proc
======================================================================
Trigger: 01325580 Segment: 000
BAT Trigger Time: 771886945.92 [s; MET]
Trigger Stop: 771886950.016 [s; MET]
UTC: 2025-06-17T21:01:50.115100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 332.902170830084 Dec: 32.7273299332687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: NO
Rate S/N Ratio: 14.3178210632764 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 332.902170830084 Dec: 32.7273299332687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 332.882525631319 Dec: 32.720691126545 [deg; J2000]
{ 22h 11m 31.8s , +32d 43' 14.5" }
+/- 1.86924757491658 [arcmin] (estimated 90% radius based on SNR)
+/- 0.645752704602281 [arcmin] (formal 1-sigma fit error)
SNR: 12.4458027713715
Angular difference between Flight and Ground position is 1.068644 arcmin
Partial Coding Fraction: 0.1025391 [ including projection effects ]
Duration
T90: 36.527999997139 +/- 6.86648431231916
Measured from: -24.663999915123
to: 11.864000082016 [s; relative to TRIGTIME]
T50: 19.9840000867844 +/- 2.95532605750028
Measured from: -16.9359999895096
to: 3.04800009727478 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.188000082969666
to: 1.18800008296967 [s; relative to TRIGTIME]
Total Fluence
Measured from: -29.3199999332428
to: 14.2960000038147 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.239103 1.602304 0.826953 0.211573
0.155980 0.160233 0.129429 0.101529 [error]
Peak 0.127577 0.129443 0.079969 -0.004289
0.026789 0.030148 0.024378 0.015432 [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 5.73e-07 7.17e-07 6.54e-07 1.04e-06 2.30e-06 2.98e-06 erg/cm2
Error 1.03e-07 8.78e-08 1.25e-07 3.93e-07 3.04e-07 5.35e-07 erg/cm2
Peak flux Power-law 2.00e+00 7.46e-01 1.60e-01 4.10e-02 2.93e+00 2.95e+00 ph/cm2/s
Error 6.08e-01 2.40e-01 8.68e-02 4.18e-02 8.26e-01 8.30e-01 ph/cm2/s
Fluence Cutoff-PL 4.86e-07 8.05e-07 6.90e-07 3.09e-07 2.19e-06 2.29e-06 erg/cm2
Error 1.25e-07 1.17e-07 1.46e-07 4.25e-07 3.14e-07 4.83e-07 erg/cm2
Peak flux Cutoff-PL 1.33e+00 1.33e+00 3.85e-01 2.13e-02 3.06e+00 3.06e+00 ph/cm2/s
Error 9.06e-01 3.97e-01 2.33e-01 2.70e-02 8.58e-01 8.59e-01 ph/cm2/s
Fluence Band 4.87e-07 7.96e-07 6.90e-07 3.37e-07 2.20e-06 2.32e-06 erg/cm2
Error -------- 1.12e-07 1.23e-07 -------- 3.07e-07 -------- 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 2.134 0.219 - - 5.65e-03 8.10e-04 71.720 57
CPL 1.029 1.060 41.9 0.0 2.14e-02 0.00e+00 67.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.211 0.506 - - 9.11e-03 4.08e-03 74.320 57
CPL -0.066 2.471 34.9 24.0 4.56e-01 5.55e+00 66.410 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: 37.056000 sec.
T50 in the 50-300 keV band: 18.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 43.616 -29.320 14.296
T90 36.528 -24.664 11.864
T50 19.984 -16.936 3.048
Peak 1.000 0.188 1.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
332.8825 +32.7207 0.0154 54.7 0.6 4.1595 12.4 TRIG_01325580
------------------------------------------
Foreground time interval of the image:
-29.320 14.296 (delta_t = 43.616 [sec])
Background time interval of the image:
-272.920 -29.320 (delta_t = 243.600 [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 -29.320 sec. to 14.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13353 ( -0.210812 0.226659 )
Norm@50keV : 5.65169E-03 ( -0.000819416 0.000799922 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.72 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 57 degrees of freedom
# Null hypothesis probability = 9.070413e-02
Photon flux (15-150 keV) in 43.62 sec: 0.904160 ( -0.114941 0.115388 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29851e-06 ( -3.0244e-07 3.04749e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -29.320 sec. to 14.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02949 ( -1.18634 0.93428 )
Epeak [keV] : 41.8899 ( )
Norm@50keV : 2.14471E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.51 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 56 degrees of freedom
# Null hypothesis probability = 1.393415e-01
Photon flux (15-150 keV) in 43.62 sec: 0.860957 ( -0.120387 0.120766 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.19467e-06 ( -3.11818e-07 3.17035e-07 ) ergs/cm2
Band function
Time interval is from -29.320 sec. to 14.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02843 ( -0.535234 1.37086 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 41.8690 ( -28.6273 12.7508 )
Norm@50keV : 2.14816E-02 ( -0.0214812 0.0685038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.51 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 55 degrees of freedom
# Null hypothesis probability = 1.198807e-01
Photon flux (15-150 keV) in 43.62 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20376e-06 ( -2.20346e-06 -3.13008e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2722 (-1.39731 1.57678)
R^2/D10^2 : 0.265034 (-0.106794 0.178674)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.95 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 57 degrees of freedom
# Null hypothesis probability = 4.029145e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.083e-07 6.770e-08
25- 50 8.992e-07 1.415e-07
50-150 6.574e-07 1.749e-07
15-150 1.865e-06 3.110e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.2532 (-16.4692 25.3914)
Norm : 4.63983 (-0.867085 1.02579)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.116e-07 8.877e-08
25- 50 7.873e-07 1.119e-07
50-150 9.233e-07 2.419e-07
15-150 2.222e-06 3.357e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.27025 (-1.13629 2.59169)
R1^2/D10^2 : 248.580 (-245.688 178668)
kT2 [keV] : 12.7480 (-1.87277 2.8786)
R2^2/D10^2 : 0.152501 (-0.0915362 0.135129)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.159e-07 1.996e-07
25- 50 7.870e-07 2.078e-07
50-150 7.850e-07 2.575e-07
15-150 2.088e-06 4.475e-07
Peak spectrum fit
Power-law model
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.21147 ( -0.401442 0.61146 )
Norm@50keV : 9.10595E-03 ( -0.00421461 0.00394741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.304 for 57 degrees of freedom
# Null hypothesis probability = 6.140824e-02
Photon flux (15-150 keV) in 1 sec: 2.93331 ( -0.825945 0.826329 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21237e-07 ( -3.62195e-08 3.63813e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.58313E-02 ( -2.96694 1.97553 )
Epeak [keV] : 34.9141 ( -34.9224 13.0042 )
Norm@50keV : 0.456123 ( -0.481436 10.6237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.41 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 56 degrees of freedom
# Null hypothesis probability = 1.610023e-01
Photon flux (15-150 keV) in 1 sec: 3.05739 ( -0.86549 0.85078 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.58513e-07 ( -4.2217e-08 4.3241e-08 ) ergs/cm2
Band function
Time interval is from 0.188 sec. to 1.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.31760 ( 6.3176 6.3176 )
beta : -3.22696 ( -0.615408 0.398741 )
Epeak [keV] : 3.35992 ( -3.35992 -3.35992 )
Norm@50keV : 1.22331 ( -0.569523 0.539417 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.32 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Null hypothesis probability = 4.234875e-02
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] : 10.7713 (-2.37574 2.08199)
R^2/D10^2 : 1.19102 (-0.631244 1.87622)
(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 2.874e-08 1.467e-08
25- 50 7.909e-08 3.840e-08
50-150 5.099e-08 2.906e-08
15-150 1.588e-07 7.305e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.3004 (-10.2769 10.2642)
Norm : 26.9292 (-9.22437 14.4722)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.414e-08 1.588e-08
25- 50 6.105e-08 1.991e-08
50-150 3.241e-08 2.186e-08
15-150 1.476e-07 4.999e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.72103 (-1.62255 2.20003)
R1^2/D10^2 : 309.513 (-299.494 816832)
kT2 [keV] : 11.8861 (-2.3783 2.28133)
R2^2/D10^2 : 0.689610 (-0.416767 1.02343)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.133e-08 2.940e-08
25- 50 6.722e-08 3.969e-08
50-150 5.408e-08 3.838e-08
15-150 1.726e-07 9.310e-08
Plot creation:
Sat Jun 21 15:04:18 EDT 2025