batgrbproduct analysis for trigger=1321323
batgrbproduct Analysis for Trigger=1321323
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 Jun 6 20:40:17 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1321323/GCN5_download_cron
======================================================================
Trigger: 01321323 Segment: 000
BAT Trigger Time: 770842387.008 [s; MET]
Trigger Stop: 770842388.032 [s; MET]
UTC: 2025-06-05T18:52:31.274360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.976975771878 Dec: -19.7948394952968 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.53
Image Trigger?: NO
Rate S/N Ratio: 53.507008886687 [ if not an image trigger ]
Image S/N Ratio: 15.53
Flight Position: [ source = BAT ]
RA: 166.976975771878 Dec: -19.7948394952968 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.962724525547 Dec: -19.7862473050131 [deg; J2000]
{ 11h 07m 51.1s , -19d 47' 10.5" }
+/- 1.15034602436816 [arcmin] (estimated 90% radius based on SNR)
+/- 0.41199120714633 [arcmin] (formal 1-sigma fit error)
SNR: 24.9012144641876
Angular difference between Flight and Ground position is 0.955567 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 176.051999926567 +/- 5.15190848235774
Measured from: -85.4959999322891
to: 90.555999994278 [s; relative to TRIGTIME]
T50: 65.5759998559952 +/- 3.18402271047836
Measured from: -1.5479998588562
to: 64.027999997139 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00400006771087646
to: 0.995999932289124 [s; relative to TRIGTIME]
Total Fluence
Measured from: -100.300000071526
to: 126.692000031471 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 6.234376 7.687440 4.819582 1.092391
0.143606 0.148695 0.121946 0.097856 [error]
Peak 0.184240 0.237552 0.254496 0.099130
0.014697 0.017434 0.016596 0.011852 [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 2.26e-06 3.38e-06 3.79e-06 8.06e-06 1.19e-05 1.75e-05 erg/cm2
Error 1.12e-07 9.69e-08 1.32e-07 6.21e-07 3.18e-07 7.04e-07 erg/cm2
Peak flux Power-law 1.66e+00 1.94e+00 1.63e+00 2.31e+00 6.06e+00 7.54e+00 ph/cm2/s
Error 2.23e-01 1.57e-01 1.33e-01 4.02e-01 4.33e-01 5.48e-01 ph/cm2/s
Fluence Cutoff-PL 2.10e-06 3.46e-06 3.86e-06 5.14e-06 1.16e-05 1.46e-05 erg/cm2
Error 1.44e-07 1.09e-07 1.42e-07 1.41e-06 3.71e-07 1.46e-06 erg/cm2
Peak flux Cutoff-PL 1.67e+00 1.94e+00 1.63e+00 2.28e+00 6.06e+00 7.52e+00 ph/cm2/s
Error 2.30e-01 1.55e-01 -------- 4.66e-01 4.33e-01 6.71e-01 ph/cm2/s
Fluence Band 2.01e-06 3.50e-06 3.79e-06 6.60e-06 1.15e-05 1.59e-05 erg/cm2
Error 1.59e-07 1.23e-07 1.46e-07 1.05e-06 3.60e-07 1.09e-06 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 1.835 0.050 - - 5.68e-03 1.51e-04 79.050 57
CPL 1.500 0.216 76.7 27.6 8.25e-03 1.97e-03 71.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.253 0.123 - - 5.12e-02 3.55e-03 55.730 57
CPL 1.249 0.242 10000.0 0.0 5.14e-02 3.56e-03 55.740 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: 115.840000 sec.
T50 in the 50-300 keV band: 54.784000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 226.992 -100.300 126.692
T90 176.052 -85.496 90.556
T50 65.576 -1.548 64.028
Peak 1.000 -0.004 0.996
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.9627 -19.7862 0.0077 33.0 49.1 10.5884 24.9 TRIG_01321323
------------------------------------------
Foreground time interval of the image:
-94.707 13.193 (delta_t = 107.900 [sec])
Background time interval of the image:
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 -100.300 sec. to 126.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83474 ( -0.0501769 0.0503758 )
Norm@50keV : 5.68032E-03 ( -0.000150945 0.000150795 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.05 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 57 degrees of freedom
# Null hypothesis probability = 2.824070e-02
Photon flux (15-150 keV) in 227 sec: 0.793527 ( -0.0237805 0.0238864 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18591e-05 ( -3.17394e-07 3.17666e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -100.300 sec. to 126.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50022 ( -0.221298 0.210612 )
Epeak [keV] : 76.6508 ( -12.5072 42.6432 )
Norm@50keV : 8.24646E-03 ( -0.00168783 0.00225579 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.54 using 59 PHA bins.
# Reduced chi-squared = 1.278 for 56 degrees of freedom
# Null hypothesis probability = 7.882783e-02
Photon flux (15-150 keV) in 227 sec: 0.771925 ( -0.026909 0.027062 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1556e-05 ( -3.71644e-07 3.70078e-07 ) ergs/cm2
Band function
Time interval is from -100.300 sec. to 126.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22142 ( -0.347632 0.761363 )
beta : -2.03787 ( -0.254285 0.138328 )
Epeak [keV] : 57.4188 ( -18.7504 23.3189 )
Norm@50keV : 1.18807E-02 ( -0.00419854 0.0269093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.90 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Null hypothesis probability = 1.136190e-01
Photon flux (15-150 keV) in 227 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1505e-05 ( -1.15035e-05 -3.60113e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5598 ( )
R^2/D10^2 : 0.113756 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 351.74 using 59 PHA bins.
# Reduced chi-squared = 6.1709 for 57 degrees of freedom
# Null hypothesis probability = 4.761628e-44
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.005e-06 5.459e-08
25- 50 3.620e-06 1.158e-07
50-150 4.310e-06 2.066e-07
15-150 8.936e-06 2.588e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.422 (-9.28667 14.1809)
Norm : 3.38874 (-0.155842 0.135791)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.042e-06 1.326e-07
25- 50 3.530e-06 1.396e-07
50-150 5.718e-06 1.284e-06
15-150 1.129e-05 1.350e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.44007 (-0.829149 0.862658)
R1^2/D10^2 : 0.732711 (-0.219935 0.365952)
kT2 [keV] : 24.8895 (-3.02994 4.41206)
R2^2/D10^2 : 8.50857E-03 (-0.00395986 0.00588014)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.777e-06 1.590e-07
25- 50 3.590e-06 2.134e-07
50-150 5.916e-06 5.380e-07
15-150 1.128e-05 7.378e-07
Peak spectrum fit
Power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25329 ( -0.122865 0.122448 )
Norm@50keV : 5.12062E-02 ( -0.00354781 0.00354729 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.73 using 59 PHA bins.
# Reduced chi-squared = 0.9777 for 57 degrees of freedom
# Null hypothesis probability = 5.229193e-01
Photon flux (15-150 keV) in 1 sec: 6.05956 ( -0.432873 0.433757 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.12026e-07 ( -3.94704e-08 3.96152e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24922 ( -0.318982 0.165668 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.14370E-02 ( -0.00356327 0.00356178 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 56 degrees of freedom
# Null hypothesis probability = 4.845492e-01
Photon flux (15-150 keV) in 1 sec: 6.06206 ( -0.43723 0.42948 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.1161e-07 ( -3.8975e-08 3.9753e-08 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97395 ( -4.97395 -4.97395 )
beta : -1.26720 ( -0.128566 0.126221 )
Epeak [keV] : 20.6637 ( -20.6637 5.54075 )
Norm@50keV : 1.31039E+04 ( -907.12 1.49579e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.581804e-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] : 19.3642 ( )
R^2/D10^2 : 0.303259 ( )
(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 2.220e-08 3.195e-09
25- 50 1.082e-07 1.176e-08
50-150 2.992e-07 3.580e-08
15-150 4.295e-07 3.810e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-15.9346 -200)
Norm : 25.0648 (-1.7661 1.7661)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.243e-08 5.220e-09
25- 50 1.201e-07 1.150e-08
50-150 2.634e-07 6.635e-08
15-150 4.459e-07 1.148e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.52823 (-1.41534 1.7991)
R1^2/D10^2 : 7.20538 (-4.06225 10.8204)
kT2 [keV] : 31.0477 (-5.31233 9.28927)
R2^2/D10^2 : 5.66351E-02 (-0.0317301 0.0490289)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.398e-08 1.637e-08
25- 50 1.067e-07 2.386e-08
50-150 3.580e-07 8.820e-08
15-150 5.186e-07 1.105e-07
Plot creation:
Fri Jun 6 20:45:45 EDT 2025