batgrbproduct analysis for trigger=791922
batgrbproduct Analysis for Trigger=791922
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 v2.46
Process Start Time (local time): Fri Nov 24 07:27:27 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger791922/GCN5_download_cron
======================================================================
Trigger: 00791922 Segment: 000
BAT Trigger Time: 533139307.648 [s; MET]
Trigger Stop: 533139309.696 [s; MET]
UTC: 2017-11-23T14:14:47.601920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.190266485784 Dec: 32.5309103636178 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: NO
Rate S/N Ratio: 10.5830052442584 [ if not an image trigger ]
Image S/N Ratio: 7.65
Flight Position: [ source = BAT ]
RA: 186.190266485784 Dec: 32.5309103636178 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.198437353051 Dec: 32.5034858951003 [deg; J2000]
{ 12h 24m 47.6s , +32d 30' 12.5" }
+/- 2.4108009043155 [arcmin] (estimated 90% radius based on SNR)
+/- 1.52932026779885 [arcmin] (formal 1-sigma fit error)
SNR: 8.6531374126829
Angular difference between Flight and Ground position is 1.696603 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 58.4800000786781 +/- 27.0612413239722
Measured from: -0.479999899864197
to: 58.0000001788139 [s; relative to TRIGTIME]
T50: 17.8240000605583 +/- 33.1759652712105
Measured from: 1.34400010108948
to: 19.1680001616478 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.26800000667572
to: 0.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.39200001955032
to: 60.2879999876022 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.162711 0.317109 0.220779 0.044226
0.047624 0.048995 0.042067 0.035963 [error]
Peak 0.030076 0.033122 0.027940 0.008986
0.006349 0.006900 0.005959 0.004801 [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 5.52e-08 1.11e-07 1.73e-07 5.98e-07 4.83e-07 9.37e-07 erg/cm2
Error 1.85e-08 2.25e-08 4.15e-08 3.21e-07 1.02e-07 3.50e-07 erg/cm2
Peak flux Power-law 2.98e-01 2.72e-01 1.72e-01 1.67e-01 8.11e-01 9.09e-01 ph/cm2/s
Error 9.70e-02 5.45e-02 5.21e-02 1.04e-01 1.60e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 5.47e-08 1.11e-07 1.74e-07 5.48e-07 4.84e-07 8.87e-07 erg/cm2
Error 1.97e-08 1.81e-08 4.32e-08 5.37e-07 8.04e-08 4.43e-07 erg/cm2
Peak flux Cutoff-PL 3.08e-01 2.73e-01 1.66e-01 1.53e-01 8.13e-01 8.99e-01 ph/cm2/s
Error 9.73e-02 5.49e-02 5.27e-02 1.15e-01 1.60e-01 1.79e-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 1.355 0.337 - - 8.02e-04 1.52e-04 45.810 57
CPL 1.273 0.000 442.1 0.0 8.83e-04 0.00e+00 45.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.661 0.395 - - 6.19e-03 1.40e-03 55.470 57
CPL 2.907 0.922 273.3 0.0 1.57e-03 0.00e+00 53.700 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: 5.888000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 61.680 -1.392 60.288
T90 58.480 -0.480 58.000
T50 17.824 1.344 19.168
Peak 1.000 -0.268 0.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.1984 +32.5035 0.0223 22.2 -142.9 0.5718 8.7 TRIG_00791922
------------------------------------------
Foreground time interval of the image:
-1.392 28.353 (delta_t = 29.745 [sec])
Background time interval of the image:
-239.648 -86.098 (delta_t = 153.550 [sec])
-84.648 -62.608 (delta_t = 22.040 [sec])
-61.648 -1.392 (delta_t = 60.256 [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 -1.392 sec. to 60.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35491 ( -0.339906 0.334714 )
Norm@50keV : 8.02302E-04 ( -0.000151974 0.000151266 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8037 for 57 degrees of freedom
# Null hypothesis probability = 8.558397e-01
Photon flux (15-150 keV) in 61.68 sec: 9.67527E-02 ( -0.0184963 0.0185489 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.82787e-07 ( -1.01512e-07 1.03279e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.392 sec. to 60.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27346 ( )
Epeak [keV] : 442.086 ( )
Norm@50keV : 8.83094E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.85 using 59 PHA bins.
# Reduced chi-squared = 0.8187 for 56 degrees of freedom
# Null hypothesis probability = 8.315051e-01
Photon flux (15-150 keV) in 61.68 sec: 9.67852E-02 ( -0.018857 0.0184728 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84052e-07 ( -1.10795e-07 4.99189e-08 ) ergs/cm2
Band function
Time interval is from -1.392 sec. to 60.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99267 ( -4.99267 -4.99267 )
beta : -1.39660 ( -0.420574 0.36122 )
Epeak [keV] : 22.5552 ( -22.5552 13.5196 )
Norm@50keV : 138.900 ( -25.9348 421484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.70 using 59 PHA bins.
# Reduced chi-squared = 0.8309 for 55 degrees of freedom
# Null hypothesis probability = 8.099876e-01
Photon flux (15-150 keV) in 61.68 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] : 16.4231 (-4.29617 6.13652)
R^2/D10^2 : 8.05178E-03 (-0.00524661 0.0148626)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9591 for 57 degrees of freedom
# Null hypothesis probability = 5.631287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.753e-08 1.075e-08
25- 50 1.184e-07 4.147e-08
50-150 2.254e-07 8.928e-08
15-150 3.713e-07 1.203e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-86.029 -199.362)
Norm : 0.399107 (-0.075046 0.0752438)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.95 using 59 PHA bins.
# Reduced chi-squared = 0.8236 for 57 degrees of freedom
# Null hypothesis probability = 8.264018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.130e-08 3.556e-08
25- 50 1.179e-07 6.831e-08
50-150 2.586e-07 1.491e-07
15-150 4.378e-07 2.558e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.70386 (-3.17553 4.26431)
R1^2/D10^2 : 7.59905E-02 (-0.0573902 0.11834)
kT2 [keV] : 35.7628 (-31.23 -35.755)
R2^2/D10^2 : 5.08863E-04 (-0.000461056 0.00288291)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.12 using 59 PHA bins.
# Reduced chi-squared = 0.8204 for 55 degrees of freedom
# Null hypothesis probability = 8.265051e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.444e-08 3.331e-08
25- 50 1.169e-07 6.335e-08
50-150 3.233e-07 1.828e-07
15-150 4.946e-07 2.585e-07
Peak spectrum fit
Power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66135 ( -0.379499 0.410456 )
Norm@50keV : 6.19093E-03 ( -0.00144657 0.00136123 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9731 for 57 degrees of freedom
# Null hypothesis probability = 5.327889e-01
Photon flux (15-150 keV) in 1 sec: 0.811434 ( -0.160389 0.160427 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75154e-08 ( -1.38686e-08 1.41849e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.90671 ( -1.54472 0.299091 )
Epeak [keV] : 273.258 ( )
Norm@50keV : 1.56953E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9589 for 56 degrees of freedom
# Null hypothesis probability = 5.623778e-01
Photon flux (15-150 keV) in 1 sec: 0.812763 ( -0.160349 0.159844 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73582e-08 ( -1.36692e-08 1.37737e-08 ) ergs/cm2
Band function
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35365 ( 1.35372 1.35372 )
beta : -1.66084 ( 1.66131 0.379318 )
Epeak [keV] : 19.1987 ( -19.2256 -19.2256 )
Norm@50keV : 1.41964E-02 ( -0.0141967 0.212933 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.570182e-01
Photon flux (15-150 keV) in 1 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] : 12.3871 (-3.92481 6.25664)
R^2/D10^2 : 0.166346 (-0.1234 0.485063)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.55 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 57 degrees of freedom
# Null hypothesis probability = 1.229097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.409e-09 2.359e-09
25- 50 1.766e-08 7.550e-09
50-150 1.663e-08 8.955e-09
15-150 3.970e-08 1.858e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 194.158 (-112.86 -181.03)
Norm : 3.26375 (-0.662833 0.936017)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 57 degrees of freedom
# Null hypothesis probability = 4.816042e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.155e-09 4.693e-09
25- 50 1.564e-08 8.825e-09
50-150 3.400e-08 1.930e-08
15-150 5.779e-08 3.247e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08327 (-2.55451 3.73297)
R1^2/D10^2 : 3.60389 (-3.06373 110.585)
kT2 [keV] : 29.8452 (-13.2466 -30.0758)
R2^2/D10^2 : 6.98086E-03 (-0.00639509 0.0255188)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 55 degrees of freedom
# Null hypothesis probability = 4.612378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.033e-08 5.915e-09
25- 50 1.237e-08 6.585e-09
50-150 3.815e-08 2.325e-08
15-150 6.086e-08 3.215e-08
Plot creation:
Fri Nov 24 07:35:12 EST 2017