batgrbproduct analysis for trigger=1126853
batgrbproduct Analysis for Trigger=1126853
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): Mon Oct 10 20:38:44 EDT 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1126853/batgroup_hand_proc
======================================================================
Trigger: 01126853 Segment: 000
BAT Trigger Time: 687017448 [s; MET]
Trigger Stop: 687017512 [s; MET]
UTC: 2022-10-09T14:10:17.995220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.263290423821 Dec: 19.8026146436537 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.02
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.02
Flight Position: [ source = BAT ]
RA: 288.263290423821 Dec: 19.8026146436537 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.253855403422 Dec: 19.8094643650211 [deg; J2000]
{ 19h 13m 00.9s , +19d 48' 34.1" }
+/- 2.40049698262035 [arcmin] (estimated 90% radius based on SNR)
+/- 1.32055562415132 [arcmin] (formal 1-sigma fit error)
SNR: 8.70624736376439
Angular difference between Flight and Ground position is 0.672744 arcmin
Partial Coding Fraction: 0.09667969 [ including projection effects ]
Duration
T90: 1068.40399992466 +/- 13.3427966885007
Measured from: 208.368000030518
to: 1276.77199995518 [s; relative to TRIGTIME]
T50: 532.763999938965 +/- 10.0785143416387
Measured from: 499.81200003624
to: 1032.5759999752 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 776.468000054359
to: 777.468000054359 [s; relative to TRIGTIME]
Total Fluence
Measured from: 103.296000003815
to: 1338.70399999619 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 60.063295 56.419540 28.452738 4.381049
0.392404 0.396669 0.344117 0.318531 [error]
Peak 0.092912 0.083604 0.047236 0.027912
0.011662 0.011843 0.010399 0.009699 [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 1.77e-05 2.28e-05 2.15e-05 3.59e-05 7.41e-05 9.79e-05 erg/cm2
Error 6.22e-07 4.37e-07 4.40e-07 1.75e-06 1.18e-06 1.92e-06 erg/cm2
Peak flux Power-law 8.77e-01 6.34e-01 3.04e-01 2.05e-01 1.91e+00 2.02e+00 ph/cm2/s
Error 1.77e-01 9.28e-02 8.42e-02 1.08e-01 2.73e-01 2.97e-01 ph/cm2/s
Fluence Cutoff-PL 1.77e-05 2.28e-05 2.15e-05 3.56e-05 7.41e-05 9.77e-05 erg/cm2
Error 4.96e-07 4.37e-07 4.34e-07 2.52e-06 1.17e-06 3.39e-06 erg/cm2
Peak flux Cutoff-PL 8.76e-01 6.34e-01 3.04e-01 2.04e-01 1.91e+00 2.02e+00 ph/cm2/s
Error 1.76e-01 1.05e-01 6.36e-02 1.41e-01 2.73e-01 2.91e-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 2.084 0.034 - - 6.72e-03 1.06e-04 0.000 0
CPL 1.992 0.036 5.1 12.0 7.34e-03 2.96e-04 0.000 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.062 0.304 - - 1.24e-02 2.55e-03 0.000 0
CPL 2.112 0.521 90.6 0.0 1.16e-02 0.00e+00 0.000 0
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: 881.344000 sec.
T50 in the 50-300 keV band: 487.744000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1235.410 103.296 1338.704
T90 1068.400 208.368 1276.772
T50 532.764 499.812 1032.576
Peak 1.000 776.468 777.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
Foreground time interval of the image:
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
103.296000 303.024300
348.000000 571.777000
573.000000 1338.704000
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08411 ( -0.0342909 0.0343803 )
Norm@50keV : 6.71619E-03 ( -0.000106316 0.000106299 )
------------------------------------------------------------
Reduced chi-squared =
Photon flux (15-150 keV) in 1189 sec: 1.04842 ( -0.0231365 0.0233301 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.40843e-05 ( -1.17739e-06 1.17779e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
103.296000 303.024300
348.000000 571.777000
573.000000 1338.704000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99206 ( -0.0627566 0.00932456 )
Epeak [keV] : 5.07535 ( -1.4602 22.5042 )
Norm@50keV : 7.33503E-03 ( -0.000308428 0.000284351 )
------------------------------------------------------------
Reduced chi-squared =
Photon flux (15-150 keV) in 1189 sec: 1.04817 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.4082e-05 ( -1.17699e-06 1.17295e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
103.296000 303.024300
348.000000 571.777000
573.000000 1338.704000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.60380 ( 1.60208 6.41949 )
beta : -2.08877 ( -0.0829624 0.036481 )
Epeak [keV] : 21.9814 ( -22.0227 9.95509 )
Norm@50keV : 1.47455E-02 ( -0.00514625 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 55 degrees of freedom
# Null hypothesis probability = 1.645415e-01
Photon flux (15-150 keV) in 1189 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] : 13.4443 ( )
R^2/D10^2 : 0.132175 ( )
(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 6.018e-06 2.283e-07
25- 50 2.148e-05 5.053e-07
50-150 2.502e-05 6.956e-07
15-150 5.252e-05 8.620e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 79.0230 ( )
Norm : 4.51110 ( )
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.391e-05 4.102e-07
25- 50 2.283e-05 4.697e-07
50-150 3.195e-05 8.799e-07
15-150 6.868e-05 1.088e-06
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.72048 (-0.348625 0.36089)
R1^2/D10^2 : 1.55200 (-0.293376 0.381606)
kT2 [keV] : 24.0221 (-1.36877 1.58138)
R2^2/D10^2 : 1.06287E-02 (-0.00234995 0.00281601)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.410e-05 7.966e-07
25- 50 2.338e-05 6.658e-07
50-150 3.320e-05 1.237e-06
15-150 7.068e-05 1.861e-06
Peak spectrum fit
Power-law model
Time interval is from 776.468 sec. to 777.468 sec.
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06242 ( -0.286969 0.320256 )
Norm@50keV : 1.23762E-02 ( -0.00260584 0.00249189 )
------------------------------------------------------------
Reduced chi-squared =
Photon flux (15-150 keV) in 1 sec: 1.91176 ( -0.273 0.273011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14606e-07 ( -2.12051e-08 2.20714e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 776.468 sec. to 777.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11249 ( -1.03742 0.00383453 )
Epeak [keV] : 90.5980 ( )
Norm@50keV : 1.15707E-02 ( )
------------------------------------------------------------
Reduced chi-squared =
Photon flux (15-150 keV) in 1 sec: 1.91107 ( -0.27282 0.2728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14169e-07 ( -2.29161e-08 2.2381e-08 ) ergs/cm2
Band function
Time interval is from 776.468 sec. to 777.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.91885 ( 7.91426 2.91885 )
beta : -2.06243 ( -0.320255 0.287192 )
Epeak [keV] : 48.6934 ( -48.6934 -48.6934 )
Norm@50keV : 1.68210 ( -0.354169 0.338684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.13 using 59 PHA bins.
# Reduced chi-squared = 1.8387 for 55 degrees of freedom
# Null hypothesis probability = 1.507615e-04
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] : 10.2145 ( )
R^2/D10^2 : 0.790912 ( )
(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 1.692e-08 4.545e-09
25- 50 4.334e-08 9.640e-09
50-150 2.405e-08 8.750e-09
15-150 8.431e-08 1.835e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 63.1426 (-23.5826 49.0967)
Norm : 9.71942 (-2.1146 2.86746)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.462e-08 4.600e-09
25- 50 3.805e-08 7.605e-09
50-150 4.513e-08 1.955e-08
15-150 1.078e-07 2.556e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.56991 (-1.15755 1.45205)
R1^2/D10^2 : 41.7314 (-33.2125 338.468)
kT2 [keV] : 15.7764 (-3.5297 5.57438)
R2^2/D10^2 : 0.127757 (-0.0881205 0.215422)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.787e-08 1.464e-08
25- 50 3.290e-08 1.673e-08
50-150 4.747e-08 2.945e-08
15-150 1.082e-07 4.800e-08
Plot creation:
Tue Oct 11 00:27:35 EDT 2022