batgrbproduct analysis for trigger=1336720
batgrbproduct Analysis for Trigger=1336720
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 Jul 26 04:41:20 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1336720/GCN5_download_cron
======================================================================
Trigger: 01336720 Segment: 000
BAT Trigger Time: 775101132.48 [s; MET]
Trigger Stop: 775101133.504 [s; MET]
UTC: 2025-07-25T01:51:36.455600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 35.3851107700018 Dec: -82.7843363759161 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 22.11
Image Trigger?: NO
Rate S/N Ratio: 130.502873531582 [ if not an image trigger ]
Image S/N Ratio: 22.11
Flight Position: [ source = BAT ]
RA: 35.3851107700018 Dec: -82.7843363759161 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 35.4586283422542 Dec: -82.786226352976 [deg; J2000]
{ 02h 21m 50.1s , -82d 47' 10.4" }
+/- 0.789900538427675 [arcmin] (estimated 90% radius based on SNR)
+/- 0.267300098906536 [arcmin] (formal 1-sigma fit error)
SNR: 42.6033263324355
Angular difference between Flight and Ground position is 0.565463 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 9.58399999141693 +/- 0.245405755220697
Measured from: -0.655999898910522
to: 8.92800009250641 [s; relative to TRIGTIME]
T50: 3.1839998960495 +/- 0.139542071626178
Measured from: 0.444000124931335
to: 3.62800002098083 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.059999942779541
to: 1.05999994277954 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.7720000743866
to: 9.50399994850159 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.338276 2.418837 2.490295 0.757037
0.046801 0.055336 0.053187 0.035965 [error]
Peak 0.272184 0.558137 0.578145 0.185082
0.017802 0.023036 0.023088 0.015003 [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 4.52e-07 1.03e-06 1.85e-06 7.88e-06 5.04e-06 1.12e-05 erg/cm2
Error 2.43e-08 3.29e-08 5.15e-08 5.05e-07 1.34e-07 5.27e-07 erg/cm2
Peak flux Power-law 3.00e+00 3.86e+00 3.63e+00 6.02e+00 1.25e+01 1.65e+01 ph/cm2/s
Error 2.62e-01 2.07e-01 1.77e-01 6.17e-01 5.70e-01 7.82e-01 ph/cm2/s
Fluence Cutoff-PL 4.10e-07 1.04e-06 1.93e-06 5.29e-06 4.98e-06 8.67e-06 erg/cm2
Error 3.18e-08 3.51e-08 6.54e-08 1.09e-06 1.39e-07 1.08e-06 erg/cm2
Peak flux Cutoff-PL 2.71e+00 3.97e+00 3.83e+00 4.06e+00 1.24e+01 1.46e+01 ph/cm2/s
Error 3.30e-01 2.28e-01 2.29e-01 1.17e+00 5.82e-01 1.29e+00 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 1.152 0.045 - - 4.34e-02 1.12e-03 49.200 57
CPL 0.806 0.189 207.2 105.6 6.09e-02 1.10e-02 38.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.089 0.074 - - 1.08e-01 4.78e-03 64.530 57
CPL 0.673 0.317 182.8 187.0 1.66e-01 5.49e-02 59.060 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: 9.536000 sec.
T50 in the 50-300 keV band: 2.944000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 11.276 -1.772 9.504
T90 9.584 -0.656 8.928
T50 3.184 0.444 3.628
Peak 1.000 0.060 1.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
35.4586 -82.7862 0.0045 32.8 -74.3 7.2336 42.6 TRIG_01336720
------------------------------------------
Foreground time interval of the image:
-1.772 9.504 (delta_t = 11.276 [sec])
Background time interval of the image:
-85.279 -1.772 (delta_t = 83.507 [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 -1.772 sec. to 9.504 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15240 ( -0.0452846 0.0450751 )
Norm@50keV : 4.34089E-02 ( -0.00112511 0.0011238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.20 using 59 PHA bins.
# Reduced chi-squared = 0.8631 for 57 degrees of freedom
# Null hypothesis probability = 7.591796e-01
Photon flux (15-150 keV) in 11.28 sec: 5.06380 ( -0.139471 0.139712 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03704e-06 ( -1.33679e-07 1.33797e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.772 sec. to 9.504 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.806321 ( -0.192492 0.184605 )
Epeak [keV] : 207.167 ( -52.5314 158.655 )
Norm@50keV : 6.08922E-02 ( -0.00982621 0.0121839 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.63 using 59 PHA bins.
# Reduced chi-squared = 0.6899 for 56 degrees of freedom
# Null hypothesis probability = 9.628872e-01
Photon flux (15-150 keV) in 11.28 sec: 4.97253 ( -0.14635 0.14692 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98232e-06 ( -1.39037e-07 1.38485e-07 ) ergs/cm2
Band function
Time interval is from -1.772 sec. to 9.504 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.718216 ( -0.260465 0.84583 )
beta : -1.38812 ( 1.38403 0.171731 )
Epeak [keV] : 165.418 ( -109.773 174.009 )
Norm@50keV : 6.77389E-02 ( -0.0163759 0.278814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.40 using 59 PHA bins.
# Reduced chi-squared = 0.6982 for 55 degrees of freedom
# Null hypothesis probability = 9.565935e-01
Photon flux (15-150 keV) in 11.28 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] : 21.4832 ( )
R^2/D10^2 : 0.188260 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 268.81 using 59 PHA bins.
# Reduced chi-squared = 4.7160 for 57 degrees of freedom
# Null hypothesis probability = 3.157537e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.833e-07 9.193e-09
25- 50 9.557e-07 3.598e-08
50-150 3.293e-06 1.297e-07
15-150 4.432e-06 1.297e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 21.6726 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.087e-07 1.534e-08
25- 50 1.171e-06 3.158e-08
50-150 2.568e-06 6.994e-08
15-150 4.348e-06 1.179e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.66304 (-1.09197 1.23403)
R1^2/D10^2 : 1.88502 (-0.603501 0.983337)
kT2 [keV] : 32.7042 (-3.03009 4.33459)
R2^2/D10^2 : 4.03636E-02 (-0.0139686 0.0163484)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.763e-07 4.168e-08
25- 50 1.069e-06 8.003e-08
50-150 3.552e-06 2.577e-07
15-150 4.997e-06 2.606e-07
Peak spectrum fit
Power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08917 ( -0.0745902 0.074147 )
Norm@50keV : 0.108042 ( -0.00478448 0.004782 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.302657e-01
Photon flux (15-150 keV) in 1 sec: 12.5193 ( -0.569557 0.569908 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13354e-06 ( -5.44169e-08 5.45134e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.673371 ( -0.328319 0.306303 )
Epeak [keV] : 182.783 ( -56.2472 317.731 )
Norm@50keV : 0.166487 ( -0.0444419 0.065302 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.06 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 56 degrees of freedom
# Null hypothesis probability = 3.643280e-01
Photon flux (15-150 keV) in 1 sec: 12.3551 ( -0.5814 0.5818 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11788e-06 ( -5.688e-08 5.661e-08 ) ergs/cm2
Band function
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99989 ( -4.99989 -4.99989 )
beta : -1.18134 ( -0.111545 0.0874576 )
Epeak [keV] : 31.0474 ( -31.0474 3.57191 )
Norm@50keV : 2228.91 ( -98.0327 1.87808e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.22 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 55 degrees of freedom
# Null hypothesis probability = 2.347811e-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] : 20.6769 ( )
R^2/D10^2 : 0.546667 ( )
(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 4.445e-08 4.175e-09
25- 50 2.262e-07 1.470e-08
50-150 7.199e-07 5.145e-08
15-150 9.906e-07 5.075e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 51.3555 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.279e-07 6.100e-09
25- 50 2.460e-07 1.230e-08
50-150 5.395e-07 2.540e-08
15-150 9.134e-07 4.500e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.69182 (-2.22847 2.64476)
R1^2/D10^2 : 3.34272 (-1.49373 3.54428)
kT2 [keV] : 35.2533 (-6.82203 17.8178)
R2^2/D10^2 : 7.87977E-02 (-0.0569279 0.0887729)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.702e-08 1.351e-08
25- 50 2.407e-07 3.435e-08
50-150 8.041e-07 2.111e-07
15-150 1.122e-06 2.468e-07
Plot creation:
Sat Jul 26 04:44:53 EDT 2025