batgrbproduct analysis for trigger=1345836
batgrbproduct Analysis for Trigger=1345836
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): Fri Aug 29 18:31:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1345836/GCN5_download_cron
======================================================================
Trigger: 01345836 Segment: 000
BAT Trigger Time: 778113254.08 [s; MET]
Trigger Stop: 778113255.104 [s; MET]
UTC: 2025-08-28T22:33:37.850740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 124.851735661913 Dec: -17.3884002792466 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.25
Image Trigger?: NO
Rate S/N Ratio: 12.5299640861417 [ if not an image trigger ]
Image S/N Ratio: 9.25
Flight Position: [ source = BAT ]
RA: 124.851735661913 Dec: -17.3884002792466 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 124.867416746654 Dec: -17.3521772786542 [deg; J2000]
{ 08h 19m 28.2s , -17d 21' 07.8" }
+/- 2.37828700716525 [arcmin] (estimated 90% radius based on SNR)
+/- 0.952946275764574 [arcmin] (formal 1-sigma fit error)
SNR: 8.82262873105375
Angular difference between Flight and Ground position is 2.351576 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 94.0920000076294 +/- 32.0281259471429
Measured from: -47.1999999284744
to: 46.892000079155 [s; relative to TRIGTIME]
T50: 24.3559999465942 +/- 14.0474797379826
Measured from: -19.107999920845
to: 5.24800002574921 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.123999953269958
to: 1.12399995326996 [s; relative to TRIGTIME]
Total Fluence
Measured from: -56.2319999933243
to: 76.6599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.166415 0.977018 0.596313 0.040183
0.090143 0.091283 0.075822 0.064149 [error]
Peak 0.062884 0.081234 0.040285 0.007824
0.009039 0.009447 0.007784 0.005780 [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 3.77e-07 4.75e-07 4.35e-07 6.95e-07 1.52e-06 1.98e-06 erg/cm2
Error 5.15e-08 4.54e-08 7.57e-08 2.40e-07 1.71e-07 3.24e-07 erg/cm2
Peak flux Power-law 6.76e-01 5.71e-01 3.30e-01 2.83e-01 1.70e+00 1.86e+00 ph/cm2/s
Error 1.38e-01 7.88e-02 6.21e-02 1.02e-01 2.35e-01 2.54e-01 ph/cm2/s
Fluence Cutoff-PL 3.76e-07 4.77e-07 4.35e-07 6.40e-07 1.52e-06 1.93e-06 erg/cm2
Error 5.23e-08 5.28e-08 7.66e-08 4.55e-07 1.83e-07 4.36e-07 erg/cm2
Peak flux Cutoff-PL 5.98e-01 6.45e-01 3.42e-01 9.31e-02 1.66e+00 1.68e+00 ph/cm2/s
Error 1.58e-01 1.09e-01 7.52e-02 1.34e-01 2.40e-01 2.61e-01 ph/cm2/s
Fluence Band 3.91e-07 5.44e-07 5.21e-07 6.51e-07 1.73e-06 2.11e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.69e-01 6.80e-01 3.18e-01 1.69e-01 1.65e+00 1.74e+00 ph/cm2/s
Error 1.70e-01 -------- -------- -------- 2.40e-01 2.69e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.127 0.191 - - 1.23e-03 1.54e-04 44.130 57
CPL 2.148 0.304 303.6 0.0 1.20e-03 0.00e+00 44.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.794 0.224 - - 1.24e-02 1.85e-03 44.320 57
CPL 0.759 1.154 53.7 60.2 4.62e-02 1.31e-01 40.980 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: 2.048000 sec.
T50 in the 50-300 keV band: 1.152000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 132.892 -56.232 76.660
T90 94.092 -47.200 46.892
T50 24.356 -19.108 5.248
Peak 1.000 0.124 1.124
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
124.8674 -17.3522 0.0217 34.8 -152.0 1.9378 8.8 TRIG_01345836
------------------------------------------
Foreground time interval of the image:
-56.232 76.660 (delta_t = 132.892 [sec])
Background time interval of the image:
-239.080 -56.232 (delta_t = 182.848 [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 -56.232 sec. to 76.660 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12661 ( -0.185467 0.196284 )
Norm@50keV : 1.23095E-03 ( -0.000156022 0.000151869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.13 using 59 PHA bins.
# Reduced chi-squared = 0.7743 for 57 degrees of freedom
# Null hypothesis probability = 8.936529e-01
Photon flux (15-150 keV) in 132.9 sec: 0.196243 ( -0.0187017 0.0187171 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.52411e-06 ( -1.7001e-07 1.72821e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -56.232 sec. to 76.660 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14794 ( -0.590935 0.0164048 )
Epeak [keV] : 303.582 ( )
Norm@50keV : 1.19804E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.15 using 59 PHA bins.
# Reduced chi-squared = 0.7884 for 56 degrees of freedom
# Null hypothesis probability = 8.740678e-01
Photon flux (15-150 keV) in 132.9 sec: 0.195856 ( -0.019273 0.018973 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51861e-06 ( -1.89383e-07 1.76664e-07 ) ergs/cm2
Band function
Time interval is from -56.232 sec. to 76.660 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.60776E-02 ( 1.26027 1.26027 )
beta : -2.17337 ( 2.15797 0.210166 )
Epeak [keV] : 21.1098 ( -20.1674 -20.1674 )
Norm@50keV : 5.58334E-02 ( -0.0560028 844.773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.91 using 59 PHA bins.
# Reduced chi-squared = 0.7983 for 55 degrees of freedom
# Null hypothesis probability = 8.585648e-01
Photon flux (15-150 keV) in 132.9 sec: 0.196104 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73332e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.27816 (-1.31312 1.55642)
R^2/D10^2 : 0.114403 (-0.0510965 0.0941937)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.53 using 59 PHA bins.
# Reduced chi-squared = 1.483 for 57 degrees of freedom
# Null hypothesis probability = 1.039772e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.587e-07 4.233e-08
25- 50 5.762e-07 7.369e-08
50-150 2.411e-07 6.652e-08
15-150 1.076e-06 1.457e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.8752 (-14.9907 22.864)
Norm : 1.02043 (-0.165373 0.195865)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.398e-07 4.446e-08
25- 50 5.141e-07 5.442e-08
50-150 5.758e-07 1.365e-07
15-150 1.430e-06 1.816e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.68875 (-0.848953 0.989184)
R1^2/D10^2 : 1.37497 (-0.764351 2.02738)
kT2 [keV] : 18.9450 (-3.64023 5.38596)
R2^2/D10^2 : 5.58368E-03 (-0.00343545 0.00736859)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.936e-07 1.534e-07
25- 50 4.411e-07 1.410e-07
50-150 6.687e-07 3.744e-07
15-150 1.503e-06 5.599e-07
Peak spectrum fit
Power-law model
Time interval is from 0.124 sec. to 1.124 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79435 ( -0.218926 0.228323 )
Norm@50keV : 1.23647E-02 ( -0.00186179 0.00183244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.32 using 59 PHA bins.
# Reduced chi-squared = 0.7775 for 57 degrees of freedom
# Null hypothesis probability = 8.898688e-01
Photon flux (15-150 keV) in 1 sec: 1.70011 ( -0.234802 0.235075 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13853e-07 ( -1.72824e-08 1.74925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.124 sec. to 1.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.758922 ( -1.33529 0.972948 )
Epeak [keV] : 53.6931 ( -12.8627 107.618 )
Norm@50keV : 4.62469E-02 ( -0.046277 0.215446 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.98 using 59 PHA bins.
# Reduced chi-squared = 0.7319 for 56 degrees of freedom
# Null hypothesis probability = 9.339124e-01
Photon flux (15-150 keV) in 1 sec: 1.65500 ( -0.2402 0.23978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05931e-07 ( -1.8843e-08 1.9253e-08 ) ergs/cm2
Band function
Time interval is from 0.124 sec. to 1.124 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.89867E-02 ( -1.61467 -0.0725867 )
beta : -2.32590 ( 2.32809 0.536009 )
Epeak [keV] : 42.3792 ( -19.5606 22.409 )
Norm@50keV : 0.157933 ( -0.17793 444.693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.97 using 59 PHA bins.
# Reduced chi-squared = 0.7266 for 55 degrees of freedom
# Null hypothesis probability = 9.363443e-01
Photon flux (15-150 keV) in 1 sec: 1.65411 ( 5.34589 -0.2399 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07733e-07 ( -1.07726e-07 -1.80124e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.4784 (-1.63282 1.95621)
R^2/D10^2 : 0.502447 (-0.225059 0.390834)
(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 1.393e-08 3.256e-09
25- 50 4.156e-08 7.885e-09
50-150 3.193e-08 9.675e-09
15-150 8.742e-08 1.766e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.0775 (-34.2271 75.1237)
Norm : 7.68940 (-1.34893 1.66794)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.009e-08 3.755e-09
25- 50 3.454e-08 5.260e-09
50-150 5.502e-08 2.517e-08
15-150 1.097e-07 3.152e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.44126 (-3.57398 2.75415)
R1^2/D10^2 : 1.21215 (-0.708004 1.1513)
kT2 [keV] : 27.6759 (-22.8235 -27.6946)
R2^2/D10^2 : 1.03073E-02 (-0.00993419 0.172278)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.750e-08 9.582e-09
25- 50 3.879e-08 2.066e-08
50-150 5.263e-08 2.905e-08
15-150 1.089e-07 5.259e-08
Plot creation:
Fri Aug 29 18:37:21 EDT 2025