batgrbproduct analysis for trigger=1181187
batgrbproduct Analysis for Trigger=1181187
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 Jul 28 21:24:19 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1181187/GCN5_download_cron
======================================================================
Trigger: 01181187 Segment: 000
BAT Trigger Time: 712205434.944 [s; MET]
Trigger Stop: 712205435.968 [s; MET]
UTC: 2023-07-28T02:50:03.222400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 343.538953466444 Dec: 28.1508318660294 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.66
Image Trigger?: NO
Rate S/N Ratio: 15.556349186104 [ if not an image trigger ]
Image S/N Ratio: 9.66
Flight Position: [ source = BAT ]
RA: 343.538953466444 Dec: 28.1508318660294 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 343.514323858646 Dec: 28.169304243665 [deg; J2000]
{ 22h 54m 03.4s , +28d 10' 09.5" }
+/- 1.29975108062863 [arcmin] (estimated 90% radius based on SNR)
+/- 0.527208488395804 [arcmin] (formal 1-sigma fit error)
SNR: 20.9151493310036
Angular difference between Flight and Ground position is 1.710514 arcmin
Partial Coding Fraction: 0.4960938 [ including projection effects ]
Duration
T90: 15.1039999723434 +/- 0.892307145409051
Measured from: -4.85199987888336
to: 10.2520000934601 [s; relative to TRIGTIME]
T50: 5.54799997806549 +/- 3.44707409608694
Measured from: 0.364000082015991
to: 5.91200006008148 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.407999992370605
to: 1.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: -5.62000000476837
to: 10.7400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.548872 0.711991 0.509382 0.078701
0.045353 0.047772 0.041632 0.036795 [error]
Peak 0.081407 0.117338 0.094387 0.005576
0.012251 0.013847 0.011858 0.008932 [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 1.65e-07 2.90e-07 3.88e-07 1.06e-06 1.13e-06 1.91e-06 erg/cm2
Error 2.04e-08 2.23e-08 4.05e-08 2.33e-07 9.70e-08 2.67e-07 erg/cm2
Peak flux Power-law 8.52e-01 8.18e-01 5.47e-01 5.70e-01 2.45e+00 2.79e+00 ph/cm2/s
Error 1.65e-01 1.06e-01 9.26e-02 1.85e-01 3.13e-01 3.64e-01 ph/cm2/s
Fluence Cutoff-PL 1.54e-07 3.06e-07 3.96e-07 5.14e-07 1.08e-06 1.37e-06 erg/cm2
Error 2.36e-08 2.80e-08 4.39e-08 -------- 1.07e-07 4.16e-07 erg/cm2
Peak flux Cutoff-PL 6.98e-01 9.36e-01 6.02e-01 1.79e-01 2.37e+00 2.42e+00 ph/cm2/s
Error 1.97e-01 1.40e-01 1.12e-01 -------- 3.18e-01 3.49e-01 ph/cm2/s
Fluence Band 1.52e-07 3.09e-07 3.79e-07 8.95e-07 1.10e-06 1.74e-06 erg/cm2
Error 2.65e-08 -------- 4.27e-08 -------- 1.01e-07 -------- erg/cm2
Peak flux Band 7.21e-01 9.16e-01 6.04e-01 2.24e-01 2.40e+00 2.47e+00 ph/cm2/s
Error 1.93e-01 -------- -------- -------- -------- 3.54e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.579 0.131 - - 7.35e-03 5.81e-04 52.830 57
CPL 1.095 0.534 89.9 3844.2 1.32e-02 9.10e-03 50.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.581 0.203 - - 1.92e-02 2.60e-03 56.090 57
CPL 0.297 1.010 64.4 26.7 8.93e-02 1.66e-01 49.750 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: 16.448000 sec.
T50 in the 50-300 keV band: 5.120000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.360 -5.620 10.740
T90 15.104 -4.852 10.252
T50 5.548 0.364 5.912
Peak 1.000 0.408 1.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
343.5143 +28.1693 0.0093 25.5 80.6 1.9423 20.9 TRIG_01181187
------------------------------------------
Foreground time interval of the image:
-5.620 10.740 (delta_t = 16.360 [sec])
Background time interval of the image:
-188.043 -5.620 (delta_t = 182.423 [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 -5.620 sec. to 10.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57937 ( -0.130657 0.132256 )
Norm@50keV : 7.35263E-03 ( -0.00058294 0.000579042 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9269 for 57 degrees of freedom
# Null hypothesis probability = 6.321326e-01
Photon flux (15-150 keV) in 16.36 sec: 0.938910 ( -0.0714563 0.0715185 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12788e-06 ( -9.65412e-08 9.74168e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -5.620 sec. to 10.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09475 ( -0.567162 0.500167 )
Epeak [keV] : 89.9380 ( -26.3505 7662.15 )
Norm@50keV : 1.31578E-02 ( -0.00575777 0.0124351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.09 using 59 PHA bins.
# Reduced chi-squared = 0.8944 for 56 degrees of freedom
# Null hypothesis probability = 6.970578e-01
Photon flux (15-150 keV) in 16.36 sec: 0.919198 ( -0.074338 0.074275 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08354e-06 ( -1.06926e-07 1.07695e-07 ) ergs/cm2
Band function
Time interval is from -5.620 sec. to 10.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09472 ( -0.35455 0.588571 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 89.9219 ( -22.7281 6800.91 )
Norm@50keV : 1.31570E-02 ( -0.00577785 0.0124396 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.09 using 59 PHA bins.
# Reduced chi-squared = 0.9107 for 55 degrees of freedom
# Null hypothesis probability = 6.623689e-01
Photon flux (15-150 keV) in 16.36 sec: 0.918682 ( 6.08132 -0.073452 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09868e-06 ( -1.09856e-06 -1.02e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.9179 (-1.30257 1.45879)
R^2/D10^2 : 0.136356 (-0.040777 0.0574778)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.84 using 59 PHA bins.
# Reduced chi-squared = 1.506 for 57 degrees of freedom
# Null hypothesis probability = 8.062386e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.133e-08 1.290e-08
25- 50 3.377e-07 3.043e-08
50-150 4.294e-07 6.667e-08
15-150 8.584e-07 8.065e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 179.326 (-57.0092 -178.472)
Norm : 3.84147 (-0.304142 0.34025)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.586e-07 4.292e-08
25- 50 3.011e-07 7.808e-08
50-150 6.367e-07 3.282e-07
15-150 1.096e-06 4.590e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.60624 (-1.55194 1.81032)
R1^2/D10^2 : 1.18189 (-0.641276 1.85411)
kT2 [keV] : 23.3187 (-4.53695 8.19232)
R2^2/D10^2 : 1.69472E-02 (-0.0113492 0.0221835)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.543e-07 5.450e-08
25- 50 3.036e-07 8.321e-08
50-150 6.231e-07 2.597e-07
15-150 1.081e-06 3.582e-07
Peak spectrum fit
Power-law model
Time interval is from 0.408 sec. to 1.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58112 ( -0.199881 0.206649 )
Norm@50keV : 1.91580E-02 ( -0.00261324 0.00258425 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.09 using 59 PHA bins.
# Reduced chi-squared = 0.9840 for 57 degrees of freedom
# Null hypothesis probability = 5.093955e-01
Photon flux (15-150 keV) in 1 sec: 2.44771 ( -0.312725 0.312855 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.79595e-07 ( -2.61524e-08 2.64925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.408 sec. to 1.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.297451 ( -1.11966 0.900017 )
Epeak [keV] : 64.3691 ( -12.7971 40.5298 )
Norm@50keV : 8.92979E-02 ( -0.0892975 0.242457 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.8883 for 56 degrees of freedom
# Null hypothesis probability = 7.091280e-01
Photon flux (15-150 keV) in 1 sec: 2.37200 ( -0.31798 0.31795 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67998e-07 ( -2.6526e-08 2.753e-08 ) ergs/cm2
Band function
Time interval is from 0.408 sec. to 1.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.299465 ( -0.886628 1.14114 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 64.4026 ( -12.8486 40.4356 )
Norm@50keV : 8.90630E-02 ( -0.0890629 0.242927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.75 using 59 PHA bins.
# Reduced chi-squared = 0.9045 for 55 degrees of freedom
# Null hypothesis probability = 6.749702e-01
Photon flux (15-150 keV) in 1 sec: 2.39991 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70881e-07 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1492 (-1.84647 2.14542)
R^2/D10^2 : 0.361172 (-0.14364 0.231911)
(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 1.526e-08 3.455e-09
25- 50 5.735e-08 1.112e-08
50-150 7.600e-08 1.973e-08
15-150 1.486e-07 2.510e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 166.729 (-69.8367 -165.942)
Norm : 10.2889 (-1.34051 1.50446)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.616e-08 1.256e-08
25- 50 4.922e-08 2.645e-08
50-150 1.013e-07 5.650e-08
15-150 1.767e-07 9.299e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10947 (-3.31383 4.48783)
R1^2/D10^2 : 5.27334 (-4.69052 26.1305)
kT2 [keV] : 17.5321 (-3.63122 9.42049)
R2^2/D10^2 : 0.145931 (-0.126133 0.220854)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.303e-08 1.224e-08
25- 50 5.067e-08 2.601e-08
50-150 9.136e-08 4.978e-08
15-150 1.651e-07 8.552e-08
Plot creation:
Fri Jul 28 21:27:42 EDT 2023