batgrbproduct analysis for trigger=1323295
batgrbproduct Analysis for Trigger=1323295
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): Mon Jun 16 20:09:48 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1323295/batgroup_hand_proc
======================================================================
Trigger: 01323295 Segment: 000
BAT Trigger Time: 771382961.6 [s; MET]
Trigger Stop: 771382965.696 [s; MET]
UTC: 2025-06-12T01:02:05.829480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.903128202456 Dec: -38.9020184895632 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.22
Image Trigger?: NO
Rate S/N Ratio: 10.5356537528527 [ if not an image trigger ]
Image S/N Ratio: 9.22
Flight Position: [ source = BAT ]
RA: 250.903128202456 Dec: -38.9020184895632 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.873283203958 Dec: -38.9483144026152 [deg; J2000]
{ 16h 43m 29.6s , -38d 56' 53.9" }
+/- 4.34086993374728 [arcmin] (estimated 90% radius based on SNR)
+/- 2.5074252453182 [arcmin] (formal 1-sigma fit error)
SNR: 3.73503278508233
Angular difference between Flight and Ground position is 3.107518 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 274.171999931335 +/- 66.542690220624
Measured from: 0.927999973297119
to: 275.099999904633 [s; relative to TRIGTIME]
T50: 113.536000013351 +/- 87.8133127066389
Measured from: 4.84799993038177
to: 118.383999943733 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.623999953269958
to: 1.62399995326996 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.575999975204468
to: 291.519999980927 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.028534 0.802187 0.249436 0.141425
0.137377 0.127392 0.103988 0.086999 [error]
Peak 0.038727 0.043537 0.017661 0.003237
0.008636 0.008318 0.006447 0.005129 [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 3.41e-07 3.33e-07 2.27e-07 2.42e-07 9.98e-07 1.14e-06 erg/cm2
Error 7.47e-08 6.68e-08 9.75e-08 2.02e-07 2.18e-07 3.35e-07 erg/cm2
Peak flux Power-law 4.00e-01 2.83e-01 1.33e-01 8.71e-02 8.58e-01 9.03e-01 ph/cm2/s
Error 1.23e-01 6.68e-02 5.01e-02 6.05e-02 2.01e-01 2.12e-01 ph/cm2/s
Fluence Cutoff-PL 3.43e-07 3.31e-07 2.22e-07 2.32e-07 9.92e-07 1.13e-06 erg/cm2
Error -------- -------- -------- -------- -------- 3.58e-07 erg/cm2
Peak flux Cutoff-PL 3.28e-01 3.70e-01 1.17e-01 6.61e-03 8.21e-01 8.21e-01 ph/cm2/s
Error 1.42e-01 1.03e-01 9.29e-02 2.99e-02 2.01e-01 2.02e-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 2.554 0.434 - - 3.37e-04 1.05e-04 67.170 57
CPL 3.038 0.023 327.4 13.7 1.96e-04 1.80e-04 66.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.096 0.404 - - 5.46e-03 1.62e-03 48.640 57
CPL -0.201 3.053 38.1 10.4 1.26e-01 2.44e+01 44.400 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 292.096 -0.576 291.520
T90 274.172 0.928 275.100
T50 113.536 4.848 118.384
Peak 1.000 0.624 1.624
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.8733 -38.9483 0.0513 25.2 141.5 1.1549 3.7 TRIG_01323295
------------------------------------------
Foreground time interval of the image:
-0.576 260.301 (delta_t = 260.877 [sec])
Background time interval of the image:
-239.600 -0.576 (delta_t = 239.024 [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 -0.576 sec. to 291.520 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55368 ( -0.39326 0.474444 )
Norm@50keV : 3.36545E-04 ( -0.000106603 0.000102881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.677651e-01
Photon flux (15-150 keV) in 292.1 sec: 6.83482E-02 ( -0.0114085 0.0114086 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.9789e-07 ( -2.11888e-07 2.23675e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.576 sec. to 291.520 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.03842 ( -0.0298797 0.0163822 )
Epeak [keV] : 327.373 ( -0.343704 26.9593 )
Norm@50keV : 1.96227E-04 ( -0.000133668 0.000225986 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.41 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 56 degrees of freedom
# Null hypothesis probability = 1.610095e-01
Photon flux (15-150 keV) in 292.1 sec: 6.83184E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.91942e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.576 sec. to 291.520 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.91884 ( 2.91884 2.91884 )
beta : -2.55370 ( -0.47444 0.393617 )
Epeak [keV] : 44.5463 ( -44.5463 -44.5463 )
Norm@50keV : 4.57406E-02 ( -0.0144887 0.0139831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.17 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 55 degrees of freedom
# Null hypothesis probability = 1.256490e-01
Photon flux (15-150 keV) in 292.1 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] : 7.15508 (-1.54976 1.81493)
R^2/D10^2 : 0.110545 (-0.0667779 0.200756)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.83 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.934947e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.715e-07 9.130e-08
25- 50 3.879e-07 1.469e-07
50-150 6.953e-08 4.085e-08
15-150 7.289e-07 2.153e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 31.7258 (-11.959 22.166)
Norm : 0.511067 (-0.172038 0.311389)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.123e-07 7.107e-08
25- 50 3.678e-07 9.832e-08
50-150 2.165e-07 1.223e-07
15-150 8.966e-07 2.587e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.07563 (-1.17309 2.01854)
R1^2/D10^2 : 51.3892 (-53.0634 347720)
kT2 [keV] : 10.1118 (-2.6692 6.21395)
R2^2/D10^2 : 2.25995E-02 (-0.0166994 0.052845)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.282e-07 1.674e-07
25- 50 3.546e-07 2.011e-07
50-150 1.878e-07 1.258e-07
15-150 8.706e-07 4.436e-07
Peak spectrum fit
Power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09556 ( -0.37794 0.429837 )
Norm@50keV : 5.46319E-03 ( -0.00164226 0.00159547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.64 using 59 PHA bins.
# Reduced chi-squared = 0.8533 for 57 degrees of freedom
# Null hypothesis probability = 7.769300e-01
Photon flux (15-150 keV) in 1 sec: 0.857630 ( -0.200788 0.200877 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.07296e-08 ( -1.36133e-08 1.41824e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.201300 ( -4.03399 2.07288 )
Epeak [keV] : 38.0594 ( -5.35493 15.3741 )
Norm@50keV : 0.126431 ( -0.164311 48.662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.7928 for 56 degrees of freedom
# Null hypothesis probability = 8.682921e-01
Photon flux (15-150 keV) in 1 sec: 0.821103 ( -0.200578 0.202057 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.42548e-08 ( -1.20497e-08 1.41064e-08 ) ergs/cm2
Band function
Time interval is from 0.624 sec. to 1.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.186942 ( -1.24501 4.01011 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 38.0584 ( -15.1667 15.3731 )
Norm@50keV : 0.124196 ( -0.124206 28.8992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.8073 for 55 degrees of freedom
# Null hypothesis probability = 8.459401e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47925e-08 ( -4.47855e-08 -1.1711e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.62063 (-1.92346 2.42043)
R^2/D10^2 : 0.502140 (-0.296377 0.689489)
(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 9.330e-09 4.646e-09
25- 50 2.194e-08 8.696e-09
50-150 1.023e-08 5.799e-09
15-150 4.150e-08 1.585e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.4941 (-21.9957 52.0762)
Norm : 4.84815 (-1.51887 2.23011)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-08 4.016e-09
25- 50 1.768e-08 5.969e-09
50-150 1.827e-08 1.165e-08
15-150 4.798e-08 1.701e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.569122 (-7.14203 -7.14203)
R1^2/D10^2 : 6.68668E+09 (-7.04546e+09 -7.04546e+09)
kT2 [keV] : 9.86918 (-2.00388 2.55069)
R2^2/D10^2 : 0.447391 (-0.269079 0.583582)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-08 1.028e-08
25- 50 2.063e-08 3.214e-08
50-150 1.358e-08 1.991e-08
15-150 4.448e-08 4.892e-08
Plot creation:
Tue Jun 17 21:12:32 EDT 2025