batgrbproduct analysis for trigger=1173731
batgrbproduct Analysis for Trigger=1173731
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): Wed Jun 7 08:54:14 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1173731/batgroup_hand_proc
======================================================================
Trigger: 01173731 Segment: 000
BAT Trigger Time: 707703308.736 [s; MET]
Trigger Stop: 707703310.784 [s; MET]
UTC: 2023-06-06T00:14:37.322360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.816687835473 Dec: 36.4846778033881 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 166.816687835473 Dec: 36.4846778033881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.776687807976 Dec: 36.5043231759192 [deg; J2000]
{ 11h 07m 06.4s , +36d 30' 15.6" }
+/- 2.47298557737456 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03370833087767 [arcmin] (formal 1-sigma fit error)
SNR: 8.34398011933387
Angular difference between Flight and Ground position is 2.260962 arcmin
Partial Coding Fraction: 0.1523438 [ including projection effects ]
Duration
T90: 16.2560000419617 +/- 1.29471541135453
Measured from: 0.0880000591278076
to: 16.3440001010895 [s; relative to TRIGTIME]
T50: 13.0080000162125 +/- 10.3557952505818
Measured from: 1.49600005149841
to: 14.5040000677109 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.924000024795532
to: 1.92400002479553 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.263999938964844
to: 16.9680000543594 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.282157 0.510247 0.559223 0.175352
0.085127 0.091473 0.085608 0.079979 [error]
Peak 0.043690 0.100937 0.143391 0.032549
0.021343 0.023170 0.022103 0.020079 [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 1.10e-07 2.50e-07 4.50e-07 1.92e-06 1.23e-06 2.73e-06 erg/cm2
Error 3.93e-08 5.32e-08 8.19e-08 8.24e-07 2.12e-07 8.54e-07 erg/cm2
Peak flux Power-law 7.39e-01 8.48e-01 7.00e-01 9.69e-01 2.64e+00 3.26e+00 ph/cm2/s
Error 3.11e-01 2.24e-01 1.69e-01 4.83e-01 6.16e-01 7.19e-01 ph/cm2/s
Fluence Cutoff-PL 1.08e-07 2.51e-07 4.54e-07 1.78e-06 1.22e-06 2.59e-06 erg/cm2
Error 4.66e-08 5.57e-08 9.52e-08 1.69e-06 2.16e-07 1.18e-06 erg/cm2
Peak flux Cutoff-PL 3.46e-01 8.74e-01 8.66e-01 2.37e-01 2.28e+00 2.32e+00 ph/cm2/s
Error 3.69e-01 3.03e-01 2.36e-01 3.89e-01 6.89e-01 7.88e-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 1.153 0.304 - - 6.92e-03 1.18e-03 43.080 57
CPL 2.253 3.449 86.9 0.0 8.33e-04 0.00e+00 42.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.278 0.367 - - 2.22e-02 4.88e-03 66.720 57
CPL -1.198 3.343 74.7 61.1 2.51e-01 6.12e+00 62.690 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: 2.560000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 17.232 -0.264 16.968
T90 16.256 0.088 16.344
T50 13.008 1.496 14.504
Peak 1.000 0.924 1.924
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.7767 +36.5043 0.0231 49.7 -145.0 1.7713 8.3 TRIG_01173731
------------------------------------------
Foreground time interval of the image:
-0.264 16.968 (delta_t = 17.232 [sec])
Background time interval of the image:
-208.835 -0.264 (delta_t = 208.571 [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 -0.264 sec. to 16.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15330 ( -0.311369 0.296785 )
Norm@50keV : 6.92200E-03 ( -0.00118513 0.00117282 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7557 for 57 degrees of freedom
# Null hypothesis probability = 9.138143e-01
Photon flux (15-150 keV) in 17.23 sec: 0.807564 ( -0.145959 0.147377 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22655e-06 ( -2.11907e-07 2.12889e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.264 sec. to 16.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.25324 ( -2.22952 4.66787 )
Epeak [keV] : 86.9101 ( )
Norm@50keV : 8.32816E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.03 using 59 PHA bins.
# Reduced chi-squared = 0.7506 for 56 degrees of freedom
# Null hypothesis probability = 9.168877e-01
Photon flux (15-150 keV) in 17.23 sec: 0.803142 ( -0.150725 0.151719 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22487e-06 ( -2.17963e-07 2.14105e-07 ) ergs/cm2
Band function
Time interval is from -0.264 sec. to 16.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.922831 ( 0.922831 5.81645 )
beta : -1.15330 ( 1.1533 0.311369 )
Epeak [keV] : 50.0228 ( -50.0228 -50.0228 )
Norm@50keV : 1.24341E-02 ( -0.00665937 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.08 using 59 PHA bins.
# Reduced chi-squared = 0.7832 for 55 degrees of freedom
# Null hypothesis probability = 8.782723e-01
Photon flux (15-150 keV) in 17.23 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] : 21.1727 (-4.12611 5.89122)
R^2/D10^2 : 3.11709E-02 (-0.0172252 0.0332269)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.41 using 59 PHA bins.
# Reduced chi-squared = 0.8669 for 57 degrees of freedom
# Null hypothesis probability = 7.522292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.533e-08 1.454e-08
25- 50 2.342e-07 7.150e-08
50-150 7.829e-07 2.206e-07
15-150 1.062e-06 2.947e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-51.0525 -200)
Norm : 3.46216 (-0.590751 0.590751)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.485e-07 8.600e-08
25- 50 2.858e-07 1.633e-07
50-150 6.267e-07 3.488e-07
15-150 1.061e-06 6.040e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.12613 (-1.72387 9.68917)
R1^2/D10^2 : 21.6099 (-21.2187 8249.57)
kT2 [keV] : 24.0860 (-5.2977 -24.0908)
R2^2/D10^2 : 1.95795E-02 (-0.0165743 0.0254006)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 6.896e-08
25- 50 2.079e-07 7.519e-08
50-150 8.334e-07 3.557e-07
15-150 1.165e-06 4.305e-07
Peak spectrum fit
Power-law model
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27768 ( -0.370238 0.363425 )
Norm@50keV : 2.21988E-02 ( -0.00488144 0.0048736 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.72 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.775118e-01
Photon flux (15-150 keV) in 1 sec: 2.63780 ( -0.611722 0.620941 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20579e-07 ( -5.04399e-08 5.0904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.19811 ( -4.49757 2.18804 )
Epeak [keV] : 74.6942 ( -16.2169 105.889 )
Norm@50keV : 0.250951 ( -0.261845 11.9867 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.69 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 56 degrees of freedom
# Null hypothesis probability = 2.511261e-01
Photon flux (15-150 keV) in 1 sec: 2.28178 ( -0.67953 0.69782 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97006e-07 ( -5.4353e-08 5.6452e-08 ) ergs/cm2
Band function
Time interval is from 0.924 sec. to 1.924 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.12701 ( -1.76857 -0.791008 )
beta : -10.00000 ( 10 3.15241e-06 )
Epeak [keV] : 74.8673 ( -15.6403 105.685 )
Norm@50keV : 0.237816 ( -0.237816 4.84002 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.69 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 55 degrees of freedom
# Null hypothesis probability = 2.221918e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97449e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.7693 (-3.71059 4.98367)
R^2/D10^2 : 0.154528 (-0.085593 0.174026)
(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 1.075e-08 4.845e-09
25- 50 5.125e-08 1.964e-08
50-150 1.323e-07 6.025e-08
15-150 1.943e-07 6.608e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-83.4823 -199.363)
Norm : 11.2503 (-2.47975 2.47987)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.801e-08 1.676e-08
25- 50 5.389e-08 3.138e-08
50-150 1.182e-07 6.815e-08
15-150 2.001e-07 1.157e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.71025 (-1.71847 6.42676)
R1^2/D10^2 : 3408.13 (-3147.5 -3147.5)
kT2 [keV] : 19.2237 (-3.88339 5.45307)
R2^2/D10^2 : 0.140425 (-0.137603 0.112937)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.733e-08 5.783e-09
25- 50 4.934e-08 2.390e-08
50-150 1.341e-07 6.141e-08
15-150 2.007e-07 9.890e-08
Plot creation:
Wed Jun 7 09:52:03 EDT 2023