batgrbproduct analysis for trigger=1187207
batgrbproduct Analysis for Trigger=1187207
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): Sat Aug 26 16:02:53 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1187207/GCN5_download_cron
======================================================================
Trigger: 01187207 Segment: 000
BAT Trigger Time: 714688072 [s; MET]
Trigger Stop: 714688232 [s; MET]
UTC: 2023-08-25T20:27:20.108600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 261.942301998859 Dec: -16.2170733139057 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.41
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.41
Flight Position: [ source = BAT ]
RA: 261.942301998859 Dec: -16.2170733139057 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 261.969946932513 Dec: -16.39642172762 [deg; J2000]
{ 17h 27m 52.8s , -16d 23' 47.1" }
+/- 6.45868822492593 [arcmin] (estimated 90% radius based on SNR)
+/- 3.87616410257458 [arcmin] (formal 1-sigma fit error)
SNR: 2.11723639290265
Angular difference between Flight and Ground position is 10.878026 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 175.391999959946 +/- 111.191500314859
Measured from: -0.395999908447266
to: 174.996000051498 [s; relative to TRIGTIME]
T50: 88.1519999504089 +/- 13.7118395617854
Measured from: 69.0280001163483
to: 157.180000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 167.575999975204
to: 168.575999975204 [s; relative to TRIGTIME]
Total Fluence
Measured from: -112.268000006676
to: 178.664000034332 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 34.935704 27.961055 7.713197 0.683365
0.175045 0.163967 0.122574 0.094869 [error]
Peak 0.210860 0.154075 0.030467 0.004201
0.011262 0.010551 0.007488 0.005571 [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 1.52e-05 1.20e-05 6.33e-06 4.86e-06 3.57e-05 3.83e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 2.49e+00 1.15e+00 3.21e-01 1.12e-01 4.02e+00 4.07e+00 ph/cm2/s
Error 2.52e-01 9.95e-02 5.59e-02 3.47e-02 3.22e-01 3.23e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-05 1.24e-05 6.28e-06 1.89e-06 3.28e-05 3.34e-05 erg/cm2
Error 6.62e-07 2.49e-07 1.71e-07 3.29e-07 8.60e-07 9.69e-07 erg/cm2
Peak flux Cutoff-PL 2.32e+00 1.30e+00 2.40e-01 1.24e-02 3.88e+00 3.88e+00 ph/cm2/s
Error 2.77e-01 1.35e-01 7.90e-02 2.23e-02 3.29e-01 3.30e-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 2.918 0.000 - - 1.06e-02 0.00e+00 133.170 57
CPL 1.985 -0.917 0.8 0.0 3.17e-02 1.04e-03 56.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.839 0.174 - - 1.64e-02 2.19e-03 74.040 57
CPL 1.331 0.840 14.9 0.0 1.58e-01 0.00e+00 65.080 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 290.932 -112.268 178.664
T90 175.392 -0.396 174.996
T50 88.152 69.028 157.180
Peak 1.000 167.576 168.576
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
261.9699 -16.3964 0.0905 30.9 -146.4 3.8709 2.1 TRIG_01187207
------------------------------------------
Foreground time interval of the image:
-112.268 178.664 (delta_t = 290.932 [sec])
Background time interval of the image:
-119.000 -112.268 (delta_t = 6.732 [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 -112.268 sec. to 178.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.91807 ( )
Norm@50keV : 1.05897E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 133.17 using 59 PHA bins.
# Reduced chi-squared = 2.3364 for 57 degrees of freedom
# Null hypothesis probability = 4.903211e-08
Photon flux (15-150 keV) in 290.9 sec: 2.74561 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56864e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -112.268 sec. to 178.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98453 ( -0.150237 -1.98453 )
Epeak [keV] : 0.769990 ( -0.0357806 0.0364746 )
Norm@50keV : 3.16707E-02 ( -0.000575153 0.00150907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.616995e-01
Photon flux (15-150 keV) in 290.9 sec: 2.46068 ( -0.08542 0.08664 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28318e-05 ( -8.57282e-07 8.63682e-07 ) ergs/cm2
Band function
Time interval is from -112.268 sec. to 178.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74986 ( )
beta : -8.96818 ( )
Epeak [keV] : 12.2397 ( )
Norm@50keV : 3.29821E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.76 using 59 PHA bins.
# Reduced chi-squared = 2.3228 for 55 degrees of freedom
# Null hypothesis probability = 1.013815e-07
Photon flux (15-150 keV) in 290.9 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] : 9.24012 ( )
R^2/D10^2 : 1.18249 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 612.58 using 59 PHA bins.
# Reduced chi-squared = 10.747 for 57 degrees of freedom
# Null hypothesis probability = 4.274699e-94
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.793e-06 2.065e-07
25- 50 1.282e-05 2.720e-07
50-150 5.300e-06 1.905e-07
15-150 2.392e-05 4.567e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.7841 (-0.964241 1.00919)
Norm : 18.1493 (-0.83071 0.869189)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.089e-05 3.113e-07
25- 50 1.262e-05 2.356e-07
50-150 7.145e-06 2.385e-07
15-150 3.065e-05 6.109e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.87476 (-0.324403 0.325796)
R1^2/D10^2 : 7.20907 (-1.45681 1.98918)
kT2 [keV] : 15.7558 (-1.0357 1.21792)
R2^2/D10^2 : 6.29578E-02 (-0.0199289 0.0268604)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.027e-05 6.356e-07
25- 50 1.279e-05 3.869e-07
50-150 7.500e-06 4.218e-07
15-150 3.056e-05 1.094e-06
Peak spectrum fit
Power-law model
Time interval is from 167.576 sec. to 168.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.83944 ( -0.168398 0.179333 )
Norm@50keV : 1.63947E-02 ( -0.00218925 0.00218979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.04 using 59 PHA bins.
# Reduced chi-squared = 1.299 for 57 degrees of freedom
# Null hypothesis probability = 6.408949e-02
Photon flux (15-150 keV) in 1 sec: 4.02216 ( -0.321386 0.321632 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.838e-07 ( -1.60257e-08 1.62143e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 167.576 sec. to 168.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33112 ( -1.09515 0.584086 )
Epeak [keV] : 14.8770 ( )
Norm@50keV : 0.157850 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.899797e-01
Photon flux (15-150 keV) in 1 sec: 3.87900 ( -0.32899 0.32978 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67446e-07 ( -1.5856e-08 1.7002e-08 ) ergs/cm2
Band function
Time interval is from 167.576 sec. to 168.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.42138 ( )
beta : -9.08872 ( )
Epeak [keV] : 31.6971 ( )
Norm@50keV : 5.73290E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.08 using 59 PHA bins.
# Reduced chi-squared = 2.0924 for 55 degrees of freedom
# Null hypothesis probability = 3.871016e-06
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] : 6.47499 (-0.547342 0.592948)
R^2/D10^2 : 10.2679 (-3.33689 5.05607)
(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 6.331e-08 8.505e-09
25- 50 7.419e-08 8.700e-09
50-150 9.194e-09 2.959e-09
15-150 1.467e-07 1.430e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 23.3736 (-3.4704 4.2007)
Norm : 40.6591 (-7.22445 9.12363)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.115e-08 7.700e-09
25- 50 6.976e-08 6.930e-09
50-150 2.682e-08 7.480e-09
15-150 1.677e-07 1.615e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.28515 (-0.977194 1.01474)
R1^2/D10^2 : 44.4015 (-24.6578 86.0442)
kT2 [keV] : 10.5116 (-2.19212 4.16868)
R2^2/D10^2 : 0.720441 (-0.598011 1.81374)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.229e-08 3.627e-08
25- 50 6.827e-08 3.470e-08
50-150 2.683e-08 1.556e-08
15-150 1.674e-07 8.560e-08
Plot creation:
Sat Aug 26 16:05:50 EDT 2023