batgrbproduct analysis for trigger=927825
batgrbproduct Analysis for Trigger=927825
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 Oct 5 22:58:43 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger927825/GCN5_download_cron
======================================================================
Trigger: 00927825 Segment: 000
BAT Trigger Time: 591905246.556 [s; MET]
Trigger Stop: 591905246.62 [s; MET]
UTC: 2019-10-04T18:07:02.863100 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 31.7210640523513 Dec: -36.9316566745842 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.12
Image Trigger?: NO
Rate S/N Ratio: 32.832910318764 [ if not an image trigger ]
Image S/N Ratio: 9.12
Flight Position: [ source = BAT ]
RA: 31.7210640523513 Dec: -36.9316566745842 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 31.713968837788 Dec: -36.9309257572541 [deg; J2000]
{ 02h 06m 51.4s , -36d 55' 51.3" }
+/- 1.07558960845882 [arcmin] (estimated 90% radius based on SNR)
+/- 0.34558047786487 [arcmin] (formal 1-sigma fit error)
SNR: 27.4099948940422
Angular difference between Flight and Ground position is 0.343111 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 2.44399988651276 +/- 0.0823651038377751
Measured from: -0.0119998455047607
to: 2.432000041008 [s; relative to TRIGTIME]
T50: 1.77599990367889 +/- 0.0651152861923527
Measured from: 0.220000147819519
to: 1.99600005149841 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0920000076293945
to: 0.907999992370605 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0920000076293945
to: 2.57599997520447 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.418006 0.642487 0.618673 0.149051
0.026401 0.030311 0.028492 0.018941 [error]
Peak 0.228852 0.328242 0.313182 0.062057
0.017897 0.020622 0.019031 0.011693 [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 1.43e-07 2.88e-07 4.52e-07 1.57e-06 1.26e-06 2.45e-06 erg/cm2
Error 1.30e-08 1.59e-08 2.67e-08 2.02e-07 6.70e-08 2.19e-07 erg/cm2
Peak flux Power-law 2.54e+00 2.58e+00 1.85e+00 2.12e+00 7.80e+00 9.09e+00 ph/cm2/s
Error 2.80e-01 1.83e-01 1.46e-01 3.28e-01 5.24e-01 5.97e-01 ph/cm2/s
Fluence Cutoff-PL 1.34e-07 2.96e-07 4.67e-07 1.06e-06 1.24e-06 1.96e-06 erg/cm2
Error 1.59e-08 1.81e-08 3.15e-08 4.43e-07 6.94e-08 4.12e-07 erg/cm2
Peak flux Cutoff-PL 2.23e+00 2.75e+00 2.01e+00 1.15e+00 7.67e+00 8.13e+00 ph/cm2/s
Error 3.37e-01 2.18e-01 1.80e-01 4.45e-01 5.32e-01 6.84e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.26e+00 2.73e+00 1.99e+00 1.27e+00 7.70e+00 8.27e+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 1.350 0.084 - - 4.83e-02 2.38e-03 56.430 57
CPL 1.048 0.332 174.2 -55.0 6.68e-02 2.36e-02 53.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.481 0.104 - - 6.28e-02 4.14e-03 76.090 57
CPL 0.807 0.449 93.7 43.9 1.34e-01 6.97e-02 68.550 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: 2.432000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.668 -0.092 2.576
T90 2.444 -0.012 2.432
T50 1.776 0.220 1.996
Peak 1.000 -0.092 0.908
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
31.7140 -36.9309 0.0070 36.0 117.8 1.9041 27.4 TRIG_00927825
------------------------------------------
Foreground time interval of the image:
-0.092 2.576 (delta_t = 2.668 [sec])
Background time interval of the image:
-239.556 -0.092 (delta_t = 239.464 [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 -0.092 sec. to 2.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35045 ( -0.0837854 0.0837714 )
Norm@50keV : 4.82884E-02 ( -0.00237723 0.002377 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.43 using 59 PHA bins.
# Reduced chi-squared = 0.9899 for 57 degrees of freedom
# Null hypothesis probability = 4.965820e-01
Photon flux (15-150 keV) in 2.668 sec: 5.81791 ( -0.300075 0.300473 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25816e-06 ( -6.69284e-08 6.70647e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 2.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04802 ( -0.340877 0.3225 )
Epeak [keV] : 174.206 ( -64.2483 -174.206 )
Norm@50keV : 6.68402E-02 ( -0.0188794 0.0284049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9603 for 56 degrees of freedom
# Null hypothesis probability = 5.594351e-01
Photon flux (15-150 keV) in 2.668 sec: 5.74744 ( -0.30704 0.30885 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24381e-06 ( -6.95121e-08 6.93733e-08 ) ergs/cm2
Band function
Time interval is from -0.092 sec. to 2.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04804 ( -1.53656 -1.53656 )
beta : -10.0000 ( 10 5.32907e-15 )
Epeak [keV] : 174.190 ( -52.358 -174.19 )
Norm@50keV : 6.68324E-02 ( -0.0188261 0.0284317 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9778 for 55 degrees of freedom
# Null hypothesis probability = 5.213931e-01
Photon flux (15-150 keV) in 2.668 sec: 5.76962 ( ) 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] : 18.2348 ( )
R^2/D10^2 : 0.353345 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 142.30 using 59 PHA bins.
# Reduced chi-squared = 2.4964 for 57 degrees of freedom
# Null hypothesis probability = 3.041791e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.250e-08 6.083e-09
25- 50 2.918e-07 1.814e-08
50-150 7.067e-07 5.723e-08
15-150 1.061e-06 6.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-10.985 -200)
Norm : 24.3185 (-1.20546 1.20546)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.75 using 59 PHA bins.
# Reduced chi-squared = 1.276 for 57 degrees of freedom
# Null hypothesis probability = 7.803005e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.616e-07 8.711e-09
25- 50 3.109e-07 1.601e-08
50-150 6.818e-07 3.508e-08
15-150 1.154e-06 6.643e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.91654 (-1.15477 1.39584)
R1^2/D10^2 : 5.41008 (-2.46531 4.98702)
kT2 [keV] : 27.4565 (-3.27915 4.82938)
R2^2/D10^2 : 7.38964E-02 (-0.0323722 0.0432822)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.74 using 59 PHA bins.
# Reduced chi-squared = 0.9588 for 55 degrees of freedom
# Null hypothesis probability = 5.616154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-07 2.623e-08
25- 50 2.921e-07 4.369e-08
50-150 8.211e-07 1.230e-07
15-150 1.247e-06 1.597e-07
Peak spectrum fit
Power-law model
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48147 ( -0.103456 0.104209 )
Norm@50keV : 6.28069E-02 ( -0.00414166 0.0041357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.09 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.634463e-02
Photon flux (15-150 keV) in 1 sec: 7.80235 ( -0.524167 0.524641 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97667e-07 ( -4.2287e-08 4.23955e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.807002 ( -0.469412 0.428604 )
Epeak [keV] : 93.6564 ( -19.2421 68.4697 )
Norm@50keV : 0.134307 ( -0.0503898 0.0890064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.55 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 56 degrees of freedom
# Null hypothesis probability = 1.211202e-01
Photon flux (15-150 keV) in 1 sec: 7.66653 ( -0.53204 0.53218 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84885e-07 ( -4.366e-08 4.3667e-08 ) ergs/cm2
Band function
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.807158 ( -0.333652 0.554366 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 93.6510 ( -14.6781 68.4575 )
Norm@50keV : 0.134278 ( -0.0503378 0.0891062 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.55 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.035742e-01
Photon flux (15-150 keV) in 1 sec: 7.69937 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84588e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.5240 (-1.22817 1.31692)
R^2/D10^2 : 0.668278 (-0.159032 0.207626)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.82 using 59 PHA bins.
# Reduced chi-squared = 1.9617 for 57 degrees of freedom
# Null hypothesis probability = 1.983184e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.744e-08 4.470e-09
25- 50 1.619e-07 1.470e-08
50-150 3.126e-07 3.685e-08
15-150 5.119e-07 3.900e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.5035 -200)
Norm : 32.2781 (-2.10285 2.10285)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.76 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 57 degrees of freedom
# Null hypothesis probability = 7.780752e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.067e-08 6.095e-09
25- 50 1.552e-07 1.310e-08
50-150 3.403e-07 6.145e-08
15-150 5.762e-07 8.365e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.23621 (-1.29862 1.62304)
R1^2/D10^2 : 10.1821 (-5.51442 14.052)
kT2 [keV] : 22.7064 (-2.75232 4.04258)
R2^2/D10^2 : 0.180634 (-0.0858156 0.118726)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.65 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.541292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.249e-08 3.039e-08
25- 50 1.516e-07 2.920e-08
50-150 3.588e-07 7.445e-08
15-150 5.829e-07 1.164e-07
Plot creation:
Sat Oct 5 23:03:14 EDT 2019