batgrbproduct analysis for trigger=744773
batgrbproduct Analysis for Trigger=744773
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 Mar 31 20:06:48 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger744773/GCN5_download_cron
======================================================================
Trigger: 00744773 Segment: 000
BAT Trigger Time: 512605810.176 [s; MET]
Trigger Stop: 512605814.272 [s; MET]
UTC: 2017-03-30T22:29:51.341320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 283.326251844694 Dec: -13.4370573410381 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 18.6547581061776 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 283.326251844694 Dec: -13.4370573410381 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 283.330808709432 Dec: -13.4581063237878 [deg; J2000]
{ 18h 53m 19.4s , -13d 27' 29.2" }
+/- 1.62195351250604 [arcmin] (estimated 90% radius based on SNR)
+/- 0.661722852773937 [arcmin] (formal 1-sigma fit error)
SNR: 15.242756755325
Angular difference between Flight and Ground position is 1.290630 arcmin
Partial Coding Fraction: 0.4648438 [ including projection effects ]
Duration
T90: 144.727999985218 +/- 3.51292471986961
Measured from: -140.923999905586
to: 3.80400007963181 [s; relative to TRIGTIME]
T50: 110.639999985695 +/- 3.52011137176777
Measured from: -135.219999909401
to: -24.5799999237061 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -134.708000004292
to: -133.708000004292 [s; relative to TRIGTIME]
Total Fluence
Measured from: -143.208000004292
to: 126.22000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.089292 3.067145 2.637647 0.740708
0.142000 0.143695 0.123021 0.104526 [error]
Peak 0.104282 0.183003 0.224013 0.073042
0.010607 0.011477 0.011665 0.008676 [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 6.58e-07 1.30e-06 2.01e-06 6.76e-06 5.61e-06 1.07e-05 erg/cm2
Error 6.37e-08 7.37e-08 1.21e-07 9.29e-07 2.99e-07 9.96e-07 erg/cm2
Peak flux Power-law 1.01e+00 1.36e+00 1.36e+00 2.45e+00 4.52e+00 6.18e+00 ph/cm2/s
Error 1.26e-01 1.04e-01 8.83e-02 3.43e-01 2.81e-01 4.07e-01 ph/cm2/s
Fluence Cutoff-PL 6.50e-07 1.30e-06 2.01e-06 6.24e-06 5.62e-06 1.02e-05 erg/cm2
Error 5.55e-08 7.83e-08 1.26e-07 1.81e-06 3.07e-07 1.60e-06 erg/cm2
Peak flux Cutoff-PL 8.93e-01 1.39e+00 1.43e+00 1.66e+00 4.45e+00 5.37e+00 ph/cm2/s
Error 1.60e-01 1.11e-01 1.13e-01 6.26e-01 2.90e-01 6.90e-01 ph/cm2/s
Fluence Band 1.75e-06 3.19e-06 3.21e-06 5.57e-06 1.00e-05 1.38e-05 erg/cm2
Error 2.55e-07 2.99e-07 3.87e-07 -------- 8.88e-07 -------- erg/cm2
Peak flux Band 9.21e-01 1.39e+00 1.42e+00 1.79e+00 4.48e+00 5.54e+00 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 1.378 0.091 - - 2.15e-03 1.06e-04 38.520 57
CPL 1.374 0.223 9997.9 0.0 2.16e-03 5.45e-04 38.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.003 0.104 - - 3.93e-02 2.39e-03 56.490 57
CPL 0.576 0.425 197.0 1324.6 6.02e-02 2.56e-02 53.200 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: 144.896000 sec.
T50 in the 50-300 keV band: 92.864000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 269.428 -143.208 126.220
T90 144.728 -140.924 3.804
T50 110.640 -135.220 -24.580
Peak 1.000 -134.708 -133.708
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
283.3308 -13.4581 0.0126 27.2 87.7 3.4356 15.2 TRIG_00744773
------------------------------------------
Foreground time interval of the image:
-69.875 37.625 (delta_t = 107.500 [sec])
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
-143.208000 112.274000
112.824000 126.220000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37774 ( -0.0909763 0.0905344 )
Norm@50keV : 2.14897E-03 ( -0.000105739 0.000105734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.6758 for 57 degrees of freedom
# Null hypothesis probability = 9.712495e-01
Photon flux (15-150 keV) in 268.9 sec: 0.260413 ( -0.0136659 0.013715 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60966e-06 ( -2.98597e-07 2.9995e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-143.208000 112.274000
112.824000 126.220000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.37436 ( -0.310614 0.135965 )
Epeak [keV] : 9997.91 ( -9997.86 -9997.86 )
Norm@50keV : 2.15699E-03 ( -0.000106243 0.000983118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
# Reduced chi-squared = 0.6878 for 56 degrees of freedom
# Null hypothesis probability = 9.639983e-01
Photon flux (15-150 keV) in 268.9 sec: 0.260181 ( -0.014431 0.01375 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61885e-06 ( -3.23729e-07 2.90439e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-143.208000 112.274000
112.824000 126.220000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.745996 ( 0.906545 0.906545 )
beta : -1.39755 ( 1.39633 0.105552 )
Epeak [keV] : 55.7913 ( -55.5926 478.459 )
Norm@50keV : 5.91661E-03 ( -0.00596034 183268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.28 using 59 PHA bins.
# Reduced chi-squared = 0.6960 for 55 degrees of freedom
# Null hypothesis probability = 9.579150e-01
Photon flux (15-150 keV) in 268.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00163e-05 ( -1.00145e-05 -8.87101e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.5973 ( )
R^2/D10^2 : 1.69986E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 138.25 using 59 PHA bins.
# Reduced chi-squared = 2.4255 for 57 degrees of freedom
# Null hypothesis probability = 1.058078e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.854e-07 3.152e-08
25- 50 1.297e-06 1.007e-07
50-150 2.899e-06 2.466e-07
15-150 4.481e-06 3.012e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.3192 -200)
Norm : 1.08524 (-0.0537214 0.0537214)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9197 for 57 degrees of freedom
# Null hypothesis probability = 6.471153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.269e-07 4.114e-08
25- 50 1.398e-06 8.336e-08
50-150 3.067e-06 1.855e-07
15-150 5.192e-06 3.267e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.19215 (-1.23406 1.47002)
R1^2/D10^2 : 0.232245 (-0.105552 0.218987)
kT2 [keV] : 29.8165 (-4.62048 7.89289)
R2^2/D10^2 : 2.40619E-03 (-0.0012845 0.00190415)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.63 using 59 PHA bins.
# Reduced chi-squared = 0.7570 for 55 degrees of freedom
# Null hypothesis probability = 9.083160e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.236e-07 1.119e-07
25- 50 1.325e-06 1.923e-07
50-150 3.639e-06 6.651e-07
15-150 5.588e-06 7.717e-07
Peak spectrum fit
Power-law model
Time interval is from -134.708 sec. to -133.708 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00343 ( -0.104951 0.103593 )
Norm@50keV : 3.92975E-02 ( -0.00239768 0.00238971 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.49 using 59 PHA bins.
# Reduced chi-squared = 0.9911 for 57 degrees of freedom
# Null hypothesis probability = 4.941292e-01
Photon flux (15-150 keV) in 1 sec: 4.52450 ( -0.280029 0.281661 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2446e-07 ( -2.76404e-08 2.76563e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -134.708 sec. to -133.708 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.575897 ( -0.448208 0.40128 )
Epeak [keV] : 196.982 ( -71.2202 2578.05 )
Norm@50keV : 6.02056E-02 ( -0.0191931 0.0320207 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9499 for 56 degrees of freedom
# Null hypothesis probability = 5.816788e-01
Photon flux (15-150 keV) in 1 sec: 4.44974 ( -0.28961 0.28977 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18231e-07 ( -2.8884e-08 2.8743e-08 ) ergs/cm2
Band function
Time interval is from -134.708 sec. to -133.708 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99998 -4.99998 )
beta : -1.06155 ( -0.118904 0.115464 )
Epeak [keV] : 28.4471 ( -28.4471 5.07268 )
Norm@50keV : 1261.00 ( -75.4147 6.04519e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.52 using 59 PHA bins.
# Reduced chi-squared = 0.9913 for 55 degrees of freedom
# Null hypothesis probability = 4.928990e-01
Photon flux (15-150 keV) in 1 sec: 4.48064 ( ) 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] : 22.8441 (-1.78086 1.99076)
R^2/D10^2 : 0.145642 (-0.0333887 0.0422849)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.52 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.719709e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.382e-08 1.705e-09
25- 50 7.469e-08 6.525e-09
50-150 2.912e-07 2.870e-08
15-150 3.797e-07 2.695e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 ( )
Norm : 18.4303 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 129.50 using 59 PHA bins.
# Reduced chi-squared = 2.2719 for 57 degrees of freedom
# Null hypothesis probability = 1.454475e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.589e-08 3.140e-09
25- 50 8.828e-08 8.355e-09
50-150 1.936e-07 4.815e-08
15-150 3.278e-07 5.580e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.42851 (-1.81244 2.44597)
R1^2/D10^2 : 2.33107 (-1.35831 3.78305)
kT2 [keV] : 31.0038 (-4.30954 7.16569)
R2^2/D10^2 : 4.96854E-02 (-0.0245305 0.0320577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.01 using 59 PHA bins.
# Reduced chi-squared = 0.9275 for 55 degrees of freedom
# Null hypothesis probability = 6.276677e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.921e-08 1.086e-08
25- 50 7.930e-08 1.866e-08
50-150 3.134e-07 6.470e-08
15-150 4.219e-07 7.925e-08
Plot creation:
Fri Mar 31 20:33:51 EDT 2017