batgrbproduct analysis for trigger=1347265
batgrbproduct Analysis for Trigger=1347265
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 Sep 6 05:53:26 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1347265/GCN5_download_cron
======================================================================
Trigger: 01347265 Segment: 000
BAT Trigger Time: 778731031.104 [s; MET]
Trigger Stop: 778731036.608 [s; MET]
UTC: 2025-09-05T02:09:54.832760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.047015982381 Dec: 0.777401270094489 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.24
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 7.24
Flight Position: [ source = BAT ]
RA: 233.047015982381 Dec: 0.777401270094489 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 232.942986629491 Dec: 0.788766928501612 [deg; J2000]
{ 15h 31m 46.3s , +00d 47' 19.6" }
+/- 3.09692412200778 [arcmin] (estimated 90% radius based on SNR)
+/- 1.92747331810794 [arcmin] (formal 1-sigma fit error)
SNR: 6.05046846438916
Angular difference between Flight and Ground position is 6.278324 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 48 +/- 50.5964425626941
Measured from: -15.1039998531342
to: 32.8960001468658 [s; relative to TRIGTIME]
T50: 16 +/- 22.6274169979695
Measured from: 0.896000146865845
to: 16.8960001468658 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.39600002765656
to: 9.39600002765656 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.1039999723434
to: 64.8960000276566 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.330815 0.207838 0.178067 0.115798
0.078634 0.065687 0.054127 0.046999 [error]
Peak 0.007459 0.004799 0.011700 0.013096
0.008776 0.007586 0.006254 0.005275 [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 6.56e-08 1.09e-07 1.39e-07 3.52e-07 4.11e-07 6.65e-07 erg/cm2
Error 3.67e-08 3.32e-08 6.13e-08 3.97e-07 1.36e-07 4.30e-07 erg/cm2
Peak flux Power-law 4.38e-02 7.33e-02 9.32e-02 2.37e-01 2.76e-01 4.48e-01 ph/cm2/s
Error 6.81e-02 7.17e-02 7.10e-02 3.80e-01 1.68e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 6.85e-08 1.10e-07 1.34e-07 3.18e-07 4.05e-07 6.30e-07 erg/cm2
Error 3.69e-08 3.33e-08 6.07e-08 4.46e-07 1.36e-07 4.38e-07 erg/cm2
Peak flux Cutoff-PL 2.17e-02 6.51e-02 1.07e-01 9.78e-02 2.51e-01 2.93e-01 ph/cm2/s
Error 6.55e-02 7.20e-02 6.97e-02 2.26e-01 1.76e-01 4.19e-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 1.658 0.688 - - 5.60e-04 1.74e-04 49.480 57
CPL 2.244 1.109 90.6 0.0 2.79e-04 0.00e+00 48.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.654 1.095 - - 2.38e-03 1.96e-03 50.160 57
CPL -0.989 0.000 127.1 0.0 8.48e-03 2.04e+01 50.020 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: 9.472000 sec.
T50 in the 50-300 keV band: 4.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 -15.104 64.896
T90 48.000 -15.104 32.896
T50 16.000 0.896 16.896
Peak 1.000 8.396 9.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
232.9430 +0.7888 0.0319 24.1 -50.3 1.0056 6.1 TRIG_01347265
------------------------------------------
Foreground time interval of the image:
-15.104 34.996 (delta_t = 50.100 [sec])
35.896 59.197 (delta_t = 23.301 [sec])
Background time interval of the image:
-87.603 -42.284 (delta_t = 45.319 [sec])
-41.104 -15.104 (delta_t = 26.000 [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
Multiple GTIs in the spectrum
tstart tstop
-15.104000 34.996000
35.896000 64.896000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65804 ( -0.671213 0.704645 )
Norm@50keV : 5.59864E-04 ( -0.000183461 0.0001651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8681 for 57 degrees of freedom
# Null hypothesis probability = 7.500963e-01
Photon flux (15-150 keV) in 79.1 sec: 7.33045E-02 ( -0.0217027 0.0217908 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.11463e-07 ( -1.3362e-07 1.37618e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-15.104000 34.996000
35.896000 64.896000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24416 ( -1.10038 1.11676 )
Epeak [keV] : 90.5977 ( )
Norm@50keV : 2.79052E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.05 using 59 PHA bins.
# Reduced chi-squared = 0.8581 for 56 degrees of freedom
# Null hypothesis probability = 7.661073e-01
Photon flux (15-150 keV) in 79.1 sec: 7.41974E-02 ( -0.0223797 0.0210419 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.04989e-07 ( -1.26463e-07 1.44647e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-15.104000 34.996000
35.896000 64.896000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33676 ( 1.33706 1.33706 )
beta : -1.65698 ( 1.65845 0.671167 )
Epeak [keV] : 21.7789 ( -21.7943 -21.7943 )
Norm@50keV : 1.26814E-03 ( -0.00127202 266.589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8996 for 55 degrees of freedom
# Null hypothesis probability = 6.847166e-01
Photon flux (15-150 keV) in 79.1 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] : 17.8044 (-10.6741 23.9778)
R^2/D10^2 : 3.89502E-03 (-0.00364907 0.0970812)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.218945e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.962e-08 1.301e-08
25- 50 9.000e-08 5.790e-08
50-150 2.065e-07 1.358e-07
15-150 3.161e-07 1.949e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.344 (-199.354 -199.354)
Norm : 0.287395 (-0.081513 0.137044)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.661e-08 3.501e-08
25- 50 1.089e-07 6.601e-08
50-150 2.388e-07 1.416e-07
15-150 4.043e-07 2.401e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.43858 (-2.06046 3.90681)
R1^2/D10^2 : 0.743047 (-0.687935 23.0737)
kT2 [keV] : 41.4875 (-22.2905 -41.6053)
R2^2/D10^2 : 2.70775E-04 (-0.000262872 0.00238255)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.119e-08 5.335e-08
25- 50 7.358e-08 3.799e-08
50-150 3.200e-07 1.921e-07
15-150 4.847e-07 2.429e-07
Peak spectrum fit
Power-law model
Time interval is from 8.396 sec. to 9.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.654321 ( -1.1356 1.05345 )
Norm@50keV : 2.38026E-03 ( -0.00238026 0.00153388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.16 using 59 PHA bins.
# Reduced chi-squared = 0.8801 for 57 degrees of freedom
# Null hypothesis probability = 7.273128e-01
Photon flux (15-150 keV) in 1 sec: 0.276252 ( -0.15884 0.176245 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96685e-08 ( -1.55979e-08 1.56768e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.396 sec. to 9.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.988718 ( -0.234502 -0.234502 )
Epeak [keV] : 127.092 ( -276.504 -276.504 )
Norm@50keV : 8.47782E-03 ( -0.00834771 40.7194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.02 using 59 PHA bins.
# Reduced chi-squared = 0.8933 for 56 degrees of freedom
# Null hypothesis probability = 6.993592e-01
Photon flux (15-150 keV) in 1 sec: 0.251054 ( -0.156044 0.195919 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.8298e-08 ( -2.8298e-08 1.66266e-08 ) ergs/cm2
Band function
Time interval is from 8.396 sec. to 9.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -10.00000 ( 10 10 )
beta : -0.654319 ( -1.05344 1.53441 )
Epeak [keV] : 15.6671 ( -15.6671 -15.6671 )
Norm@50keV : 0.323511 ( -0.323511 0.208486 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.16 using 59 PHA bins.
# Reduced chi-squared = 0.9121 for 55 degrees of freedom
# Null hypothesis probability = 6.595715e-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] : 29.5050 (-14.1573 -29.505)
R^2/D10^2 : 4.49294E-03 (-0.00449294 0.0295978)
(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 6.182e-10 4.042e-10
25- 50 3.787e-09 2.460e-09
50-150 2.344e-08 1.520e-08
15-150 2.784e-08 1.851e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.356 (-199.36 -199.36)
Norm : 1.23632 (-0.732168 0.732047)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.378e-09 1.800e-09
25- 50 4.575e-09 3.417e-09
50-150 1.003e-08 7.340e-09
15-150 1.699e-08 1.161e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.83648 (-1.83083 190.969)
R1^2/D10^2 : 379.843 (-385.336 1.27166e+07)
kT2 [keV] : 30.9607 (-15.0641 -30.9588)
R2^2/D10^2 : 3.85291E-03 (-0.00378505 0.0191321)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.169e-09 4.324e-10
25- 50 3.568e-09 2.293e-09
50-150 2.366e-08 1.609e-08
15-150 2.940e-08 1.790e-08
Plot creation:
Sat Sep 6 05:59:34 EDT 2025