batgrbproduct analysis for trigger=823001
batgrbproduct Analysis for Trigger=823001
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): Sat Apr 7 23:35:13 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger823001/GCN5_download_cron
======================================================================
Trigger: 00823001 Segment: 000
BAT Trigger Time: 544758910.528 [s; MET]
Trigger Stop: 544758914.624 [s; MET]
UTC: 2018-04-07T01:54:49.782600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 35.2408716342746 Dec: 33.4989446062235 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.45
Image Trigger?: NO
Rate S/N Ratio: 7.74596669241483 [ if not an image trigger ]
Image S/N Ratio: 9.45
Flight Position: [ source = BAT ]
RA: 35.2408716342746 Dec: 33.4989446062235 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 35.237067915767 Dec: 33.5153548678556 [deg; J2000]
{ 02h 20m 56.9s , +33d 30' 55.3" }
+/- 1.81198314065132 [arcmin] (estimated 90% radius based on SNR)
+/- 0.680692777919341 [arcmin] (formal 1-sigma fit error)
SNR: 13.0114810490902
Angular difference between Flight and Ground position is 1.002836 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 86.2239999771118 +/- 35.318249555033
Measured from: -16.2639998197556
to: 69.9600001573563 [s; relative to TRIGTIME]
T50: 30.0640000104904 +/- 8.37032853259968
Measured from: -0.263999819755554
to: 29.8000001907349 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.18799996376038
to: 3.18799996376038 [s; relative to TRIGTIME]
Total Fluence
Measured from: -20.5520000457764
to: 105 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.959600 0.986810 0.612632 0.181491
0.087326 0.090252 0.079850 0.072890 [error]
Peak 0.033303 0.039779 0.032096 0.009297
0.008470 0.008618 0.007307 0.006610 [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 3.00e-07 4.25e-07 4.46e-07 8.63e-07 1.44e-06 2.04e-06 erg/cm2
Error 4.42e-08 4.22e-08 7.82e-08 3.06e-07 1.77e-07 3.86e-07 erg/cm2
Peak flux Power-law 3.29e-01 2.88e-01 1.74e-01 1.58e-01 8.58e-01 9.48e-01 ph/cm2/s
Error 1.12e-01 6.74e-02 5.76e-02 1.01e-01 2.00e-01 2.24e-01 ph/cm2/s
Fluence Cutoff-PL 3.01e-07 4.25e-07 4.45e-07 8.52e-07 1.44e-06 2.03e-06 erg/cm2
Error 4.14e-08 4.79e-08 7.83e-08 5.29e-07 1.88e-07 4.38e-07 erg/cm2
Peak flux Cutoff-PL 3.01e-01 3.21e-01 1.76e-01 5.60e-02 8.39e-01 8.55e-01 ph/cm2/s
Error 1.23e-01 8.99e-02 7.01e-02 1.29e-01 2.02e-01 2.40e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.07e-01 3.16e-01 1.76e-01 6.53e-02 8.44e-01 8.65e-01 ph/cm2/s
Error -------- -------- -------- -------- 2.01e-01 2.28e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.930 0.197 - - 1.25e-03 1.56e-04 48.070 57
CPL 1.894 0.640 126.1 0.0 1.31e-03 0.00e+00 48.080 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.732 0.394 - - 6.38e-03 1.67e-03 56.080 57
CPL 0.868 1.754 57.1 -2.0 1.97e-02 2.02e-01 55.010 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: 99.904000 sec.
T50 in the 50-300 keV band: 29.440000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 125.552 -20.552 105.000
T90 86.224 -16.264 69.960
T50 30.064 -0.264 29.800
Peak 1.000 2.188 3.188
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
35.2371 +33.5154 0.0148 25.7 -98.3 2.6445 13.0 TRIG_00823001
------------------------------------------
Foreground time interval of the image:
-20.552 105.000 (delta_t = 125.552 [sec])
Background time interval of the image:
-239.528 -20.552 (delta_t = 218.976 [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 -20.552 sec. to 105.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93010 ( -0.192508 0.202237 )
Norm@50keV : 1.24893E-03 ( -0.00015844 0.000154232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8433 for 57 degrees of freedom
# Null hypothesis probability = 7.943454e-01
Photon flux (15-150 keV) in 125.6 sec: 0.181569 ( -0.0179999 0.0180064 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44283e-06 ( -1.74664e-07 1.78496e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.552 sec. to 105.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89366 ( -0.686131 0.593471 )
Epeak [keV] : 126.095 ( )
Norm@50keV : 1.30961E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.08 using 59 PHA bins.
# Reduced chi-squared = 0.8586 for 56 degrees of freedom
# Null hypothesis probability = 7.650715e-01
Photon flux (15-150 keV) in 125.6 sec: 0.181546 ( -0.018139 0.017958 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44161e-06 ( -1.97971e-07 1.77485e-07 ) ergs/cm2
Band function
Time interval is from -20.552 sec. to 105.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47174 ( 1.47587 1.47587 )
beta : -1.92863 ( 1.92942 0.191968 )
Epeak [keV] : 18.2882 ( -17.0372 -17.0372 )
Norm@50keV : 3.33762E-03 ( -0.0033956 0.00743696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.07 using 59 PHA bins.
# Reduced chi-squared = 0.8740 for 55 degrees of freedom
# Null hypothesis probability = 7.344769e-01
Photon flux (15-150 keV) in 125.6 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] : 9.86506 (-1.30365 1.56697)
R^2/D10^2 : 8.58711E-02 (-0.0364909 0.0619161)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.60 using 59 PHA bins.
# Reduced chi-squared = 1.379 for 57 degrees of freedom
# Null hypothesis probability = 3.052968e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.128e-07 3.982e-08
25- 50 5.188e-07 7.059e-08
50-150 2.603e-07 7.913e-08
15-150 9.919e-07 1.362e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.3917 (-23.554 42.6894)
Norm : 0.849658 (-0.126875 0.16124)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.21 using 59 PHA bins.
# Reduced chi-squared = 0.8809 for 57 degrees of freedom
# Null hypothesis probability = 7.257725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.765e-07 3.755e-08
25- 50 4.530e-07 5.143e-08
50-150 6.307e-07 2.699e-07
15-150 1.360e-06 2.563e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.75881 (-1.33146 1.43023)
R1^2/D10^2 : 0.510267 (-0.284744 0.851324)
kT2 [keV] : 23.0546 (-6.26694 12.766)
R2^2/D10^2 : 2.69056E-03 (-0.00208952 0.00629846)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.04 using 59 PHA bins.
# Reduced chi-squared = 0.8734 for 55 degrees of freedom
# Null hypothesis probability = 7.356061e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.981e-07 1.117e-07
25- 50 4.185e-07 1.570e-07
50-150 7.199e-07 3.992e-07
15-150 1.437e-06 6.007e-07
Peak spectrum fit
Power-law model
Time interval is from 2.188 sec. to 3.188 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73239 ( -0.381953 0.406683 )
Norm@50keV : 6.38481E-03 ( -0.00169306 0.00164434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.08 using 59 PHA bins.
# Reduced chi-squared = 0.9839 for 57 degrees of freedom
# Null hypothesis probability = 5.095589e-01
Photon flux (15-150 keV) in 1 sec: 0.857796 ( -0.199808 0.19992 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.89793e-08 ( -1.57612e-08 1.63178e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.188 sec. to 3.188 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.867693 ( -2.17507 1.33307 )
Epeak [keV] : 57.0663 ( -53.1627 -57.0654 )
Norm@50keV : 1.97034E-02 ( -0.0197062 0.383887 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.01 using 59 PHA bins.
# Reduced chi-squared = 0.9823 for 56 degrees of freedom
# Null hypothesis probability = 5.124827e-01
Photon flux (15-150 keV) in 1 sec: 0.838965 ( -0.201184 0.201845 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46613e-08 ( -1.65838e-08 1.77437e-08 ) ergs/cm2
Band function
Time interval is from 2.188 sec. to 3.188 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85671 ( -6.85672 -4.85671 )
beta : -2.11902 ( -1.04567 0.551145 )
Epeak [keV] : 28.2235 ( -28.2235 8.03484 )
Norm@50keV : 341.250 ( -77.4719 5.11328e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.81 using 59 PHA bins.
# Reduced chi-squared = 0.9784 for 55 degrees of freedom
# Null hypothesis probability = 5.199941e-01
Photon flux (15-150 keV) in 1 sec: 0.844278 ( 6.15572 -0.20501 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.59765e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.9834 (-2.75195 4.14257)
R^2/D10^2 : 0.296081 (-0.205617 0.570356)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.30 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.272156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.461e-09 3.428e-09
25- 50 2.106e-08 9.362e-09
50-150 1.433e-08 8.222e-09
15-150 4.285e-08 1.896e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 105.885 (-56.5056 -105.945)
Norm : 3.79868 (-1.0202 1.47113)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9685 for 57 degrees of freedom
# Null hypothesis probability = 5.427708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.926e-09 5.855e-09
25- 50 1.736e-08 1.027e-08
50-150 2.904e-08 2.137e-08
15-150 5.632e-08 3.649e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.99825 (-2.94983 3.8104)
R1^2/D10^2 : 1.10603 (-0.878387 6.08354)
kT2 [keV] : 24.0747 (-19.7201 95.6072)
R2^2/D10^2 : 1.09533E-02 (-0.0118593 0.134729)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.80 using 59 PHA bins.
# Reduced chi-squared = 0.9782 for 55 degrees of freedom
# Null hypothesis probability = 5.205213e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.825e-09 5.915e-09
25- 50 1.817e-08 1.039e-08
50-150 2.898e-08 1.637e-08
15-150 5.697e-08 3.034e-08
Plot creation:
Sat Apr 7 23:40:15 EDT 2018