batgrbproduct analysis for trigger=1185505
batgrbproduct Analysis for Trigger=1185505
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 Aug 16 10:45:28 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1185505/GCN5_download_cron
======================================================================
Trigger: 01185505 Segment: 000
BAT Trigger Time: 713789427.776 [s; MET]
Trigger Stop: 713789428.8 [s; MET]
UTC: 2023-08-15T10:49:55.945980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 184.771873845278 Dec: -58.0651019896104 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.07
Image Trigger?: NO
Rate S/N Ratio: 67.0447611674469 [ if not an image trigger ]
Image S/N Ratio: 15.07
Flight Position: [ source = BAT ]
RA: 184.771873845278 Dec: -58.0651019896104 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 184.760062482941 Dec: -58.0665310192608 [deg; J2000]
{ 12h 19m 02.4s , -58d 03' 59.5" }
+/- 1.2201250969348 [arcmin] (estimated 90% radius based on SNR)
+/- 0.45534211519231 [arcmin] (formal 1-sigma fit error)
SNR: 22.8919916898631
Angular difference between Flight and Ground position is 0.384535 arcmin
Partial Coding Fraction: 0.1113281 [ including projection effects ]
Duration
T90: 17 +/- 7.61577310586391
Measured from: -11.7759999036789
to: 5.22400009632111 [s; relative to TRIGTIME]
T50: 2 +/- 1
Measured from: -0.775999903678894
to: 1.22400009632111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.223999977111816
to: 1.22399997711182 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.7760000228882
to: 9.22399997711182 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.010197 2.265473 2.464035 1.140586
0.121373 0.134766 0.128249 0.114803 [error]
Peak 0.245374 0.440376 0.697228 0.250868
0.031834 0.041042 0.044108 0.034812 [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 4.91e-07 1.09e-06 1.92e-06 7.87e-06 5.24e-06 1.14e-05 erg/cm2
Error 6.08e-08 8.16e-08 1.20e-07 1.11e-06 3.12e-07 1.16e-06 erg/cm2
Peak flux Power-law 2.96e+00 4.08e+00 4.15e+00 7.69e+00 1.37e+01 1.89e+01 ph/cm2/s
Error 4.99e-01 4.27e-01 3.25e-01 1.27e+00 1.13e+00 1.51e+00 ph/cm2/s
Fluence Cutoff-PL 4.53e-07 1.11e-06 1.99e-06 5.54e-06 5.20e-06 9.10e-06 erg/cm2
Error 7.79e-08 8.76e-08 1.56e-07 2.08e-06 3.20e-07 2.77e-06 erg/cm2
Peak flux Cutoff-PL 2.69e+00 4.12e+00 4.35e+00 5.90e+00 1.35e+01 1.71e+01 ph/cm2/s
Error 6.48e-01 4.49e-01 4.64e-01 2.15e+00 1.15e+00 2.67e+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 1.188 0.101 - - 2.15e-02 1.28e-03 51.560 57
CPL 0.886 0.398 219.9 -61.5 2.90e-02 1.20e-02 50.010 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.975 0.131 - - 1.19e-01 9.59e-03 40.700 57
CPL 0.658 0.531 264.7 0.0 1.61e-01 8.44e-02 39.740 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: 9.344000 sec.
T50 in the 50-300 keV band: 1.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 24.000 -14.776 9.224
T90 17.000 -11.776 5.224
T50 2.000 -0.776 1.224
Peak 1.000 0.224 1.224
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
184.7601 -58.0665 0.0084 54.4 -2.7 7.0748 22.9 TRIG_01185505
------------------------------------------
Foreground time interval of the image:
-14.776 9.224 (delta_t = 24.000 [sec])
Background time interval of the image:
-239.776 -37.046 (delta_t = 202.730 [sec])
-35.776 -14.776 (delta_t = 21.000 [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 -14.776 sec. to 9.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18837 ( -0.102212 0.100576 )
Norm@50keV : 2.14575E-02 ( -0.00128663 0.00128179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.56 using 59 PHA bins.
# Reduced chi-squared = 0.9045 for 57 degrees of freedom
# Null hypothesis probability = 6.787252e-01
Photon flux (15-150 keV) in 24 sec: 2.51463 ( -0.162368 0.163088 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24203e-06 ( -3.11599e-07 3.11695e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.776 sec. to 9.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.885766 ( -0.451957 0.344062 )
Epeak [keV] : 219.901 ( -97.013 -219.919 )
Norm@50keV : 2.89699E-02 ( -0.0082393 0.0156915 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.01 using 59 PHA bins.
# Reduced chi-squared = 0.8931 for 56 degrees of freedom
# Null hypothesis probability = 6.997411e-01
Photon flux (15-150 keV) in 24 sec: 2.47950 ( -0.16842 0.16937 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20262e-06 ( -3.20448e-07 3.18792e-07 ) ergs/cm2
Band function
Time interval is from -14.776 sec. to 9.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.481821 ( -0.663241 5.44899 )
beta : -1.36602 ( 1.36661 0.213296 )
Epeak [keV] : 105.697 ( -51.3642 135.525 )
Norm@50keV : 4.76125E-02 ( -0.0255597 0.689277 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8837 for 55 degrees of freedom
# Null hypothesis probability = 7.160541e-01
Photon flux (15-150 keV) in 24 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] : 20.9045 (-1.49864 1.67735)
R^2/D10^2 : 0.101389 (-0.0232984 0.0291962)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.07 using 59 PHA bins.
# Reduced chi-squared = 1.703 for 57 degrees of freedom
# Null hypothesis probability = 7.413696e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.013e-07 2.546e-08
25- 50 1.032e-06 9.024e-08
50-150 3.359e-06 2.556e-07
15-150 4.592e-06 2.892e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.96966 -200)
Norm : 10.9178 (-0.648155 0.648155)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.528e-07 4.308e-08
25- 50 1.256e-06 8.952e-08
50-150 2.754e-06 5.772e-07
15-150 4.662e-06 3.564e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.4745 (-2.82574 2.98464)
R1^2/D10^2 : 0.480939 (-0.216782 0.556745)
kT2 [keV] : 47.2583 (-15.7274 -47.4138)
R2^2/D10^2 : 5.73209E-03 (-0.00462932 0.0153514)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.549e-07 8.491e-08
25- 50 1.204e-06 2.879e-07
50-150 3.617e-06 1.461e-06
15-150 5.175e-06 1.745e-06
Peak spectrum fit
Power-law model
Time interval is from 0.224 sec. to 1.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.974651 ( -0.13289 0.129271 )
Norm@50keV : 0.118745 ( -0.00962598 0.00954406 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.70 using 59 PHA bins.
# Reduced chi-squared = 0.7141 for 57 degrees of freedom
# Null hypothesis probability = 9.493262e-01
Photon flux (15-150 keV) in 1 sec: 13.6547 ( -1.12721 1.12934 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29577e-06 ( -1.01989e-07 1.02085e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.224 sec. to 1.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.658148 ( -0.613353 0.448727 )
Epeak [keV] : 264.679 ( -264.678 -264.678 )
Norm@50keV : 0.160648 ( -0.0486565 0.120206 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.74 using 59 PHA bins.
# Reduced chi-squared = 0.7097 for 56 degrees of freedom
# Null hypothesis probability = 9.507186e-01
Photon flux (15-150 keV) in 1 sec: 13.5256 ( -1.1472 1.1505 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29324e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.224 sec. to 1.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.505575 ( 0.788555 0.788555 )
beta : -1.17473 ( 1.17628 0.301786 )
Epeak [keV] : 179.684 ( -180.781 232.038 )
Norm@50keV : 0.192007 ( -0.0791216 6974.75 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 55 degrees of freedom
# Null hypothesis probability = 9.422359e-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] : 24.1975 (-2.26082 2.64541)
R^2/D10^2 : 0.376131 (-0.106198 0.139637)
(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 3.891e-08 6.910e-09
25- 50 2.171e-07 2.765e-08
50-150 9.462e-07 1.001e-07
15-150 1.202e-06 1.155e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-10.5836 -200)
Norm : 57.5403 (-4.66814 4.66814)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.433e-07 1.255e-08
25- 50 2.757e-07 3.475e-08
50-150 6.047e-07 2.120e-07
15-150 1.024e-06 2.955e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.5115 (-7.38118 6.85296)
R1^2/D10^2 : 2.01837 (-1.2887 105.506)
kT2 [keV] : 41.9051 (-16.5818 -42.1663)
R2^2/D10^2 : 5.49752E-02 (-0.0463742 0.247348)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.998e-08 3.772e-08
25- 50 2.504e-07 1.261e-07
50-150 9.725e-07 4.902e-07
15-150 1.293e-06 6.492e-07
Plot creation:
Wed Aug 16 10:50:01 EDT 2023