batgrbproduct analysis for trigger=1088376
batgrbproduct Analysis for Trigger=1088376
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 Dec 8 16:11:51 EST 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1088376/GCN5_download_cron
======================================================================
Trigger: 01088376 Segment: 000
BAT Trigger Time: 660603204.992 [s; MET]
Trigger Stop: 660603206.016 [s; MET]
UTC: 2021-12-07T20:52:56.775700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 149.625262667391 Dec: -24.3518427204482 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.77
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 7.77
Flight Position: [ source = BAT ]
RA: 149.625262667391 Dec: -24.3518427204482 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 149.600622476747 Dec: -24.3603689223291 [deg; J2000]
{ 09h 58m 24.1s , -24d 21' 37.3" }
+/- 2.27527397339317 [arcmin] (estimated 90% radius based on SNR)
+/- 1.03239920820218 [arcmin] (formal 1-sigma fit error)
SNR: 9.39875304543273
Angular difference between Flight and Ground position is 1.440717 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 3.7279999256134 +/- 0.868147459306752
Measured from: -0.935999870300293
to: 2.79200005531311 [s; relative to TRIGTIME]
T50: 1.68799996376038 +/- 0.709985879650207
Measured from: 0.0200001001358032
to: 1.70800006389618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.151999950408936
to: 0.848000049591064 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.30400002002716
to: 2.97200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.094569 0.134070 0.071289 0.002855
0.016897 0.017982 0.015768 0.013721 [error]
Peak 0.028301 0.046910 0.033674 0.005322
0.008529 0.008908 0.008113 0.006861 [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 3.13e-08 5.05e-08 6.15e-08 1.47e-07 1.85e-07 2.91e-07 erg/cm2
Error 7.91e-09 8.21e-09 1.55e-08 7.74e-08 3.61e-08 9.18e-08 erg/cm2
Peak flux Power-law 3.20e-01 3.11e-01 2.11e-01 2.24e-01 9.32e-01 1.07e+00 ph/cm2/s
Error 1.15e-01 7.32e-02 6.39e-02 1.34e-01 2.14e-01 2.49e-01 ph/cm2/s
Fluence Cutoff-PL 3.10e-08 5.05e-08 6.19e-08 1.20e-07 1.85e-07 2.55e-07 erg/cm2
Error 8.55e-09 9.54e-09 1.60e-08 1.18e-07 3.78e-08 1.15e-07 erg/cm2
Peak flux Cutoff-PL 2.42e-01 3.56e-01 2.34e-01 5.93e-02 8.80e-01 8.92e-01 ph/cm2/s
Error 1.96e-01 9.59e-02 7.94e-02 8.98e-02 2.23e-01 2.64e-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 1.716 0.304 - - 4.69e-03 8.66e-04 67.350 57
CPL 1.709 1.540 9783.6 -0.0 4.70e-03 1.09e-02 67.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.560 0.384 - - 7.34e-03 1.77e-03 66.080 57
CPL -0.020 2.473 62.8 -22.5 4.67e-02 8.14e-01 63.970 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 4.276 -1.304 2.972
T90 3.728 -0.936 2.792
T50 1.688 0.020 1.708
Peak 1.000 -0.152 0.848
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
149.6006 -24.3604 0.0204 33.0 9.0 0.3040 9.4 TRIG_01088376
------------------------------------------
Foreground time interval of the image:
-1.304 2.972 (delta_t = 4.276 [sec])
Background time interval of the image:
-239.992 -71.892 (delta_t = 168.100 [sec])
-70.992 -14.582 (delta_t = 56.410 [sec])
-12.992 -1.304 (delta_t = 11.688 [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 -1.304 sec. to 2.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71551 ( -0.294159 0.314037 )
Norm@50keV : 4.68828E-03 ( -0.000880934 0.000850799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.35 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.640520e-01
Photon flux (15-150 keV) in 4.276 sec: 0.626068 ( -0.102024 0.102096 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85395e-07 ( -3.57434e-08 3.65391e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.304 sec. to 2.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70854 ( -1.26074 1.81889 )
Epeak [keV] : 9783.65 ( -8772.51 -8772.52 )
Norm@50keV : 4.70430E-03 ( -0.00470505 0.0170416 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.35 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 56 degrees of freedom
# Null hypothesis probability = 1.423594e-01
Photon flux (15-150 keV) in 4.276 sec: 0.625647 ( -0.105025 0.102217 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85358e-07 ( -3.91694e-08 3.64042e-08 ) ergs/cm2
Band function
Time interval is from -1.304 sec. to 2.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.66863 ( 1.64499 2.66863 )
beta : -1.71551 ( -0.314036 0.294171 )
Epeak [keV] : 164.861 ( -164.861 -164.861 )
Norm@50keV : 0.637204 ( -0.119733 0.115637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.35 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 55 degrees of freedom
# Null hypothesis probability = 1.226128e-01
Photon flux (15-150 keV) in 4.276 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] : 12.4212 (-2.44387 3.17128)
R^2/D10^2 : 0.132797 (-0.0742303 0.160242)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.33 using 59 PHA bins.
# Reduced chi-squared = 1.374 for 57 degrees of freedom
# Null hypothesis probability = 3.198356e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.857e-08 5.877e-09
25- 50 6.081e-08 1.577e-08
50-150 5.770e-08 2.237e-08
15-150 1.371e-07 3.737e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.165 (-70.3019 -137.621)
Norm : 2.58024 (-0.463633 0.677898)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.849e-08 1.576e-08
25- 50 5.227e-08 2.886e-08
50-150 1.003e-07 6.128e-08
15-150 1.810e-07 1.058e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.06907 (-1.80648 6.48969)
R1^2/D10^2 : 23.0371 (-21.1595 20253.6)
kT2 [keV] : 16.6152 (-4.54484 73.1217)
R2^2/D10^2 : 4.16924E-02 (-0.0394476 0.0893166)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.127e-08 1.504e-08
25- 50 4.714e-08 2.197e-08
50-150 8.569e-08 3.900e-08
15-150 1.641e-07 7.041e-08
Peak spectrum fit
Power-law model
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56033 ( -0.372491 0.396152 )
Norm@50keV : 7.34306E-03 ( -0.00179168 0.00175759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 57 degrees of freedom
# Null hypothesis probability = 1.919995e-01
Photon flux (15-150 keV) in 1 sec: 0.932396 ( -0.213845 0.21416 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.90266e-08 ( -1.78501e-08 1.83295e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.95058E-02 ( -3.11766 1.82909 )
Epeak [keV] : 62.8005 ( -17.7475 -62.7995 )
Norm@50keV : 4.66888E-02 ( -0.0466971 1.58223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 56 degrees of freedom
# Null hypothesis probability = 2.171076e-01
Photon flux (15-150 keV) in 1 sec: 0.879719 ( -0.221111 0.224321 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.28812e-08 ( -1.80248e-08 1.9716e-08 ) ergs/cm2
Band function
Time interval is from -0.152 sec. to 0.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.87198E-02 ( -1.55481 2.1947 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 63.9408 ( -40.9662 82.2099 )
Norm@50keV : 4.27348E-02 ( -0.0427469 1688.35 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.906432e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24514e-08 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3894 (-3.03529 3.97219)
R^2/D10^2 : 0.129211 (-0.0752536 0.16676)
(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 5.635e-09 2.637e-09
25- 50 2.153e-08 9.239e-09
50-150 2.976e-08 1.485e-08
15-150 5.692e-08 2.141e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 181.432 (-105.768 -176.177)
Norm : 3.84398 (-0.888816 1.13612)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.685e-09 5.770e-09
25- 50 1.842e-08 1.055e-08
50-150 3.911e-08 2.242e-08
15-150 6.721e-08 3.883e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.51784 (-2.48923 14.0391)
R1^2/D10^2 : 62.9611 (-65.2112 -65.2112)
kT2 [keV] : 15.5897 (-3.56003 -15.5802)
R2^2/D10^2 : 9.28272E-02 (-0.0929997 0.116156)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.327e-09 3.688e-09
25- 50 1.957e-08 1.139e-08
50-150 3.245e-08 2.096e-08
15-150 6.034e-08 3.350e-08
Plot creation:
Wed Dec 8 16:17:58 EST 2021