batgrbproduct analysis for trigger=1176135
batgrbproduct Analysis for Trigger=1176135
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 23 05:33:19 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1176135/GCN5_download_cron
======================================================================
Trigger: 01176135 Segment: 000
BAT Trigger Time: 709121092.8 [s; MET]
Trigger Stop: 709121093.312 [s; MET]
UTC: 2023-06-22T10:04:21.289560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 292.532303762044 Dec: -32.9215292302855 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: NO
Rate S/N Ratio: 15.0996688705415 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 292.532303762044 Dec: -32.9215292302855 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 292.516032457063 Dec: -32.9723985689196 [deg; J2000]
{ 19h 30m 03.8s , -32d 58' 20.6" }
+/- 2.19687325339505 [arcmin] (estimated 90% radius based on SNR)
+/- 1.01000189115981 [arcmin] (formal 1-sigma fit error)
SNR: 9.88156020092351
Angular difference between Flight and Ground position is 3.160203 arcmin
Partial Coding Fraction: 0.3085938 [ including projection effects ]
Duration
T90: 18.3679999113083 +/- 13.6344035142522
Measured from: 0.136000156402588
to: 18.5040000677109 [s; relative to TRIGTIME]
T50: 12.0319998264313 +/- 11.0766234561059
Measured from: 0.520000219345093
to: 12.5520000457764 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000457763672
to: 1.05200004577637 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0559999942779541
to: 23.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.478364 0.265652 0.121550 0.076319
0.059585 0.060901 0.051842 0.049106 [error]
Peak 0.123454 0.128980 0.063679 0.020529
0.015316 0.016809 0.013086 0.010678 [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 1.36e-07 1.35e-07 9.48e-08 1.05e-07 4.08e-07 4.71e-07 erg/cm2
Error 2.97e-08 3.07e-08 4.32e-08 9.04e-08 1.02e-07 1.56e-07 erg/cm2
Peak flux Power-law 1.29e+00 9.10e-01 4.22e-01 2.73e-01 2.76e+00 2.90e+00 ph/cm2/s
Error 2.38e-01 1.30e-01 9.97e-02 1.17e-01 3.89e-01 4.13e-01 ph/cm2/s
Fluence Cutoff-PL 1.35e-07 1.41e-07 8.67e-08 4.42e-08 3.90e-07 4.07e-07 erg/cm2
Error 3.04e-08 3.75e-08 6.97e-08 1.07e-07 1.14e-07 1.76e-07 erg/cm2
Peak flux Cutoff-PL 1.18e+00 1.06e+00 4.27e-01 7.64e-02 2.72e+00 2.74e+00 ph/cm2/s
Error 2.68e-01 1.83e-01 1.22e-01 1.14e-01 3.89e-01 3.98e-01 ph/cm2/s
Fluence Band 2.11e-07 3.35e-07 2.94e-07 1.63e-07 9.44e-07 1.01e-06 erg/cm2
Error 5.10e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.18e+00 1.06e+00 4.29e-01 3.64e-02 2.73e+00 2.75e+00 ph/cm2/s
Error 2.56e-01 1.82e-01 -------- -------- 3.85e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.516 0.431 - - 1.70e-03 5.71e-04 57.080 57
CPL 1.984 0.276 1.1 14.8 3.74e-03 0.00e+00 56.940 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.109 0.246 - - 1.74e-02 3.20e-03 51.890 57
CPL 0.949 1.122 38.0 0.0 8.28e-02 0.00e+00 47.710 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 23.936 -0.056 23.880
T90 18.368 0.136 18.504
T50 12.032 0.520 12.552
Peak 1.000 0.052 1.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
292.5160 -32.9724 0.0195 31.9 77.1 0.7142 9.9 TRIG_01176135
------------------------------------------
Foreground time interval of the image:
-0.056 8.001 (delta_t = 8.057 [sec])
Background time interval of the image:
-239.800 -91.530 (delta_t = 148.270 [sec])
-63.800 -0.056 (delta_t = 63.744 [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 -0.056 sec. to 23.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51597 ( -0.392978 0.468712 )
Norm@50keV : 1.69594E-03 ( -0.000570841 0.00057145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.719522e-01
Photon flux (15-150 keV) in 23.94 sec: 0.336446 ( -0.062405 0.0624658 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0776e-07 ( -9.81214e-08 1.05205e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 23.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98396 ( -0.538323 0.0134547 )
Epeak [keV] : 1.06020 ( -0.589164 29.0493 )
Norm@50keV : 3.73664E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.397347e-01
Photon flux (15-150 keV) in 23.94 sec: 0.333337 ( -0.062994 0.063416 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89544e-07 ( -1.08041e-07 1.19566e-07 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 23.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.94534 ( 1.29062 1.29062 )
beta : -2.87867 ( 2.72059 0.551769 )
Epeak [keV] : 20.8390 ( -16.4745 23.7098 )
Norm@50keV : 215.647 ( -215.642 370.825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.74 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Null hypothesis probability = 4.466182e-01
Photon flux (15-150 keV) in 23.94 sec: 0.675402 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.44347e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.98588 (-1.2152 1.65099)
R^2/D10^2 : 1.21295 (-0.776773 2.07249)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.63 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.139514e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.378e-07 5.675e-08
25- 50 1.367e-07 5.488e-08
50-150 1.240e-08 9.220e-09
15-150 2.869e-07 1.138e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.1458 (-11.2977 21.0509)
Norm : 2.77055 (-0.968012 1.79846)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.330e-07 3.526e-08
25- 50 1.495e-07 4.810e-08
50-150 7.881e-08 5.590e-08
15-150 3.613e-07 1.121e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.58530 (-1.34109 1.52357)
R1^2/D10^2 : 3.17410 (-2.20407 11.115)
kT2 [keV] : 16.7144 (-12.5515 30.6958)
R2^2/D10^2 : 1.03830E-02 (-0.0101808 0.118976)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.432e-07 7.907e-08
25- 50 1.296e-07 6.536e-08
50-150 1.248e-07 8.729e-08
15-150 3.976e-07 2.044e-07
Peak spectrum fit
Power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10945 ( -0.234143 0.25765 )
Norm@50keV : 1.74364E-02 ( -0.00324919 0.00315762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9103 for 57 degrees of freedom
# Null hypothesis probability = 6.667395e-01
Photon flux (15-150 keV) in 1 sec: 2.75606 ( -0.389069 0.389082 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62153e-07 ( -2.70839e-08 2.76279e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.948877 ( -1.25545 0.988766 )
Epeak [keV] : 38.0080 ( )
Norm@50keV : 8.27999E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8520 for 56 degrees of freedom
# Null hypothesis probability = 7.767771e-01
Photon flux (15-150 keV) in 1 sec: 2.72230 ( -0.38891 0.38935 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53037e-07 ( -2.6875e-08 2.8259e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.949184 ( -0.610816 1.52302 )
beta : -10.0000 ( 10 3.01981e-14 )
Epeak [keV] : 38.0004 ( -17.8127 13.9763 )
Norm@50keV : 8.27612E-02 ( -0.0827608 0.377161 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.71 using 59 PHA bins.
# Reduced chi-squared = 0.8675 for 55 degrees of freedom
# Null hypothesis probability = 7.465099e-01
Photon flux (15-150 keV) in 1 sec: 2.73376 ( 4.26624 -0.38236 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53633e-07 ( -1.53626e-07 -2.7047e-08 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.83201 (-1.58214 1.76663)
R^2/D10^2 : 1.43674 (-0.674956 1.36402)
(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 2.812e-08 6.495e-09
25- 50 6.824e-08 1.338e-08
50-150 3.390e-08 1.360e-08
15-150 1.303e-07 2.513e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3443 (-17.0387 27.7723)
Norm : 15.2504 (-3.13127 3.83535)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.791e-08 6.565e-09
25- 50 5.657e-08 9.515e-09
50-150 6.102e-08 2.191e-08
15-150 1.555e-07 3.135e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.79753 (-1.78227 2.43307)
R1^2/D10^2 : 13.4074 (-10.2539 84.8619)
kT2 [keV] : 14.6072 (-3.54418 7.03937)
R2^2/D10^2 : 0.230255 (-0.194388 0.554643)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.788e-08 2.126e-08
25- 50 5.626e-08 2.962e-08
50-150 5.796e-08 3.452e-08
15-150 1.521e-07 7.935e-08
Plot creation:
Fri Jun 23 05:38:12 EDT 2023