batgrbproduct analysis for trigger=1094950
batgrbproduct Analysis for Trigger=1094950
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): Thu Mar 3 07:23:32 EST 2022
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1094950/GCN5_download_cron
======================================================================
Trigger: 01094950 Segment: 000
BAT Trigger Time: 667899648.192 [s; MET]
Trigger Stop: 667899652.288 [s; MET]
UTC: 2022-03-02T07:40:19.483320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.431936947381 Dec: 49.3889348270439 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.47
Image Trigger?: NO
Rate S/N Ratio: 9.79795897113271 [ if not an image trigger ]
Image S/N Ratio: 7.47
Flight Position: [ source = BAT ]
RA: 301.431936947381 Dec: 49.3889348270439 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.399464137966 Dec: 49.4083541245987 [deg; J2000]
{ 20h 05m 35.9s , +49d 24' 30.1" }
+/- 2.69506240293639 [arcmin] (estimated 90% radius based on SNR)
+/- 1.20826043603723 [arcmin] (formal 1-sigma fit error)
SNR: 7.37938310872671
Angular difference between Flight and Ground position is 1.722026 arcmin
Partial Coding Fraction: 0.4453125 [ including projection effects ]
Duration
T90: 6.83599996566772 +/- 2.21846801049015
Measured from: -1.69999992847443
to: 5.1360000371933 [s; relative to TRIGTIME]
T50: 1.77999997138977 +/- 1.28746108921992
Measured from: 0.604000091552734
to: 2.3840000629425 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.459999918937683
to: 1.45999991893768 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.86800003051758
to: 5.38800001144409 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.183684 0.157323 0.177390 0.032963
0.035113 0.036712 0.032854 0.029902 [error]
Peak 0.037079 0.044495 0.050792 0.025873
0.013772 0.014235 0.012921 0.011121 [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 4.64e-08 8.81e-08 1.29e-07 4.06e-07 3.66e-07 6.70e-07 erg/cm2
Error 1.65e-08 1.88e-08 3.24e-08 2.30e-07 7.90e-08 2.51e-07 erg/cm2
Peak flux Power-law 3.60e-01 3.99e-01 3.17e-01 4.15e-01 1.23e+00 1.49e+00 ph/cm2/s
Error 2.01e-01 1.36e-01 9.97e-02 2.91e-01 3.66e-01 4.13e-01 ph/cm2/s
Fluence Cutoff-PL 4.61e-08 8.84e-08 1.29e-07 4.02e-07 3.65e-07 6.39e-07 erg/cm2
Error 1.73e-08 1.69e-08 3.33e-08 3.88e-07 7.88e-08 2.96e-07 erg/cm2
Peak flux Cutoff-PL 3.73e-01 4.05e-01 3.13e-01 3.96e-01 1.24e+00 1.49e+00 ph/cm2/s
Error 2.08e-01 1.37e-01 1.05e-01 3.83e-01 3.66e-01 4.09e-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 1.446 0.359 - - 5.27e-03 1.04e-03 57.740 57
CPL 1.441 0.000 9999.3 0.0 5.28e-03 0.00e+00 57.740 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.335 0.524 - - 1.02e-02 2.82e-03 34.210 57
CPL 1.344 0.528 9999.4 0.0 1.02e-02 2.82e-03 34.220 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: 1.792000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.256 -1.868 5.388
T90 6.836 -1.700 5.136
T50 1.780 0.604 2.384
Peak 1.000 0.460 1.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.3995 +49.4084 0.0261 41.3 -21.8 0.5458 7.4 TRIG_01094950
------------------------------------------
Foreground time interval of the image:
-1.868 5.388 (delta_t = 7.256 [sec])
Background time interval of the image:
-239.192 -43.592 (delta_t = 195.600 [sec])
-42.192 -1.868 (delta_t = 40.324 [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 -1.868 sec. to 5.388 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44562 ( -0.358731 0.35989 )
Norm@50keV : 5.26727E-03 ( -0.00103951 0.001034 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.477998e-01
Photon flux (15-150 keV) in 7.256 sec: 0.648415 ( -0.131474 0.131934 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.66014e-07 ( -7.85491e-08 7.93959e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.868 sec. to 5.388 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44083 ( )
Epeak [keV] : 9999.28 ( )
Norm@50keV : 5.27903E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.74 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 56 degrees of freedom
# Null hypothesis probability = 4.107134e-01
Photon flux (15-150 keV) in 7.256 sec: 0.649810 ( -0.133099 0.130451 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.65015e-07 ( -7.79207e-08 7.97449e-08 ) ergs/cm2
Band function
Time interval is from -1.868 sec. to 5.388 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98277 ( -4.98277 -4.98277 )
beta : -1.47283 ( -0.397041 0.372309 )
Epeak [keV] : 21.0756 ( -21.0756 9.26102 )
Norm@50keV : 1479.61 ( -287.687 3.4537e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.61 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.789344e-01
Photon flux (15-150 keV) in 7.256 sec: 0.649018 ( ) 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] : 18.0680 (-4.45902 6.25373)
R^2/D10^2 : 3.82990E-02 (-0.0240385 0.0626677)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.96 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.722090e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.814e-08 8.200e-09
25- 50 8.414e-08 3.253e-08
50-150 1.996e-07 8.834e-08
15-150 3.019e-07 1.145e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-94.6591 -199.363)
Norm : 2.67094 (-0.522979 0.522979)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.826e-08 2.837e-08
25- 50 9.283e-08 5.362e-08
50-150 2.036e-07 1.183e-07
15-150 3.447e-07 1.975e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.55602 (-1.72526 3.58809)
R1^2/D10^2 : 3.82572 (-3.40842 17.5274)
kT2 [keV] : 25.4797 (-7.37 17.837)
R2^2/D10^2 : 1.07342E-02 (-0.00872429 0.0235184)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.453e-08 3.262e-08
25- 50 7.344e-08 3.652e-08
50-150 2.397e-07 1.456e-07
15-150 3.676e-07 1.982e-07
Peak spectrum fit
Power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33525 ( -0.537121 0.511065 )
Norm@50keV : 1.02391E-02 ( -0.00282201 0.00281661 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.21 using 59 PHA bins.
# Reduced chi-squared = 0.6002 for 57 degrees of freedom
# Null hypothesis probability = 9.928015e-01
Photon flux (15-150 keV) in 1 sec: 1.22983 ( -0.364977 0.367338 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00338e-07 ( -2.9205e-08 2.93233e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34442 ( -0.552917 0.503393 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.02376E-02 ( -0.00282414 0.00282519 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.22 using 59 PHA bins.
# Reduced chi-squared = 0.6110 for 56 degrees of freedom
# Null hypothesis probability = 9.904576e-01
Photon flux (15-150 keV) in 1 sec: 1.23878 ( -0.373841 0.35865 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0025e-07 ( -2.90514e-08 2.904e-08 ) ergs/cm2
Band function
Time interval is from 0.460 sec. to 1.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06656 ( 1.06675 1.06675 )
beta : -1.33516 ( 1.33521 0.536901 )
Epeak [keV] : 40.8745 ( -40.7322 -40.7322 )
Norm@50keV : 1.97572E-02 ( -0.0123248 1.7547 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.21 using 59 PHA bins.
# Reduced chi-squared = 0.6220 for 55 degrees of freedom
# Null hypothesis probability = 9.875094e-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] : 19.6492 (-5.68914 10.219)
R^2/D10^2 : 5.72118E-02 (-0.057162 0.127033)
(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 4.288e-09 2.692e-09
25- 50 2.111e-08 1.299e-08
50-150 6.025e-08 3.769e-08
15-150 8.565e-08 5.155e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-107.224 -199.363)
Norm : 5.17437 (-1.44323 1.44322)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.288e-08 7.895e-09
25- 50 2.478e-08 1.541e-08
50-150 5.436e-08 3.330e-08
15-150 9.203e-08 5.435e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.95651 (-2.66746 6.29584)
R1^2/D10^2 : 13.2972 (-13.1134 33343.6)
kT2 [keV] : 25.0002 (-8.58954 -25.0009)
R2^2/D10^2 : 2.31561E-02 (-0.0218893 0.0531418)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.398e-08 8.400e-09
25- 50 1.828e-08 1.012e-08
50-150 6.615e-08 4.068e-08
15-150 9.841e-08 5.325e-08
Plot creation:
Thu Mar 3 07:29:48 EST 2022