batgrbproduct analysis for trigger=744791
batgrbproduct Analysis for Trigger=744791
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 1 04:42:40 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger744791/GCN5_download_cron
======================================================================
Trigger: 00744791 Segment: 000
BAT Trigger Time: 512617265.28 [s; MET]
Trigger Stop: 512617273.472 [s; MET]
UTC: 2017-03-31T01:40:46.444640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 323.782196657932 Dec: -24.413770984427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.93
Image Trigger?: NO
Rate S/N Ratio: 9.4339811320566 [ if not an image trigger ]
Image S/N Ratio: 7.93
Flight Position: [ source = BAT ]
RA: 323.782196657932 Dec: -24.413770984427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 323.778359863261 Dec: -24.4062199363142 [deg; J2000]
{ 21h 35m 06.8s , -24d 24' 22.4" }
+/- 2.0128335109169 [arcmin] (estimated 90% radius based on SNR)
+/- 0.860569373601906 [arcmin] (formal 1-sigma fit error)
SNR: 11.1971413237704
Angular difference between Flight and Ground position is 0.499210 arcmin
Partial Coding Fraction: 0.1855469 [ including projection effects ]
Duration
T90: 17.5680000185966 +/- 2.57327802102363
Measured from: -1.72799986600876
to: 15.8400001525879 [s; relative to TRIGTIME]
T50: 9.60000002384186 +/- 2.36249361399115
Measured from: 1.44000017642975
to: 11.0400002002716 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.420000016689301
to: 1.4200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.783999979496
to: 17.1680000424385 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.522292 0.809861 0.376945 0.061794
0.075201 0.077398 0.064764 0.053963 [error]
Peak 0.038770 0.063904 0.044743 0.023827
0.016539 0.017409 0.014886 0.013112 [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 2.09e-07 3.08e-07 3.39e-07 7.00e-07 1.07e-06 1.56e-06 erg/cm2
Error 3.73e-08 3.77e-08 6.19e-08 2.53e-07 1.48e-07 3.18e-07 erg/cm2
Peak flux Power-law 4.78e-01 4.20e-01 2.54e-01 2.31e-01 1.25e+00 1.38e+00 ph/cm2/s
Error 2.37e-01 1.43e-01 1.01e-01 1.76e-01 4.20e-01 4.47e-01 ph/cm2/s
Fluence Cutoff-PL 1.77e-07 3.65e-07 3.36e-07 1.14e-07 9.66e-07 9.92e-07 erg/cm2
Error 4.41e-08 5.50e-08 7.71e-08 1.80e-07 1.55e-07 2.23e-07 erg/cm2
Peak flux Cutoff-PL 2.95e-01 5.58e-01 2.83e-01 2.15e-02 1.16e+00 1.16e+00 ph/cm2/s
Error 2.78e-01 2.00e-01 1.40e-01 9.37e-02 4.35e-01 4.38e-01 ph/cm2/s
Fluence Band 1.75e-07 3.64e-07 3.32e-07 1.75e-07 9.71e-07 1.05e-06 erg/cm2
Error -------- -------- -------- 2.60e-07 -------- -------- 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 1.864 0.207 - - 5.84e-03 8.05e-04 68.070 57
CPL 0.371 1.193 48.2 12.7 3.90e-02 1.09e-01 61.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.729 0.506 - - 9.32e-03 3.12e-03 69.010 57
CPL -1.415 4.521 49.9 33.4 4.30e-01 1.05e+02 65.700 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.952 -2.784 17.168
T90 17.568 -1.728 15.840
T50 9.600 1.440 11.040
Peak 1.000 0.420 1.420
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
323.7784 -24.4062 0.0173 39.6 -62.8 1.7681 11.2 TRIG_00744791
------------------------------------------
Foreground time interval of the image:
-2.784 17.168 (delta_t = 19.952 [sec])
Background time interval of the image:
-239.280 -111.920 (delta_t = 127.360 [sec])
-111.280 -2.784 (delta_t = 108.496 [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 -2.784 sec. to 17.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86371 ( -0.202158 0.211136 )
Norm@50keV : 5.83715E-03 ( -0.00081178 0.000798604 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.07 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.496577e-01
Photon flux (15-150 keV) in 19.95 sec: 0.825079 ( -0.102127 0.102248 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07062e-06 ( -1.47177e-07 1.4922e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.784 sec. to 17.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.370612 ( -1.34789 1.03729 )
Epeak [keV] : 48.2076 ( -8.44828 17.0403 )
Norm@50keV : 3.90325E-02 ( -0.0390334 0.178978 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.853752e-01
Photon flux (15-150 keV) in 19.95 sec: 0.786319 ( -0.105533 0.105664 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.66204e-07 ( -1.50251e-07 1.60693e-07 ) ergs/cm2
Band function
Time interval is from -2.784 sec. to 17.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.370633 ( -0.690663 1.59499 )
beta : -10.00000 ( 10 1.00559e-08 )
Epeak [keV] : 48.1983 ( -8.37012 17.0376 )
Norm@50keV : 3.90347E-02 ( -0.00468359 0.17938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.51 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Null hypothesis probability = 2.544009e-01
Photon flux (15-150 keV) in 19.95 sec: 0.786796 ( 6.2132 -0.052641 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.70619e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.5121 (-1.37074 1.56599)
R^2/D10^2 : 0.240991 (-0.0930186 0.148133)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.48 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.827538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.341e-07 2.849e-08
25- 50 4.017e-07 6.324e-08
50-150 3.110e-07 8.868e-08
15-150 8.468e-07 1.377e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.3115 (-25.2401 47.2616)
Norm : 3.88558 (-0.646832 0.782651)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.63 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.545013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.016e-07 3.405e-08
25- 50 3.351e-07 4.479e-08
50-150 4.859e-07 2.234e-07
15-150 1.023e-06 2.270e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50203 (-5.57632 -6.56034)
R1^2/D10^2 : 0.954084 (-0.690588 0.529173)
kT2 [keV] : 15.8373 (-15.3198 -16.0553)
R2^2/D10^2 : 5.20930E-02 (-0.0477273 0.19989)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 55 degrees of freedom
# Null hypothesis probability = 2.416004e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.730e-07 9.936e-08
25- 50 3.659e-07 1.845e-07
50-150 4.111e-07 2.386e-07
15-150 9.500e-07 4.944e-07
Peak spectrum fit
Power-law model
Time interval is from 0.420 sec. to 1.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72938 ( -0.499305 0.512551 )
Norm@50keV : 9.32269E-03 ( -0.00313545 0.00309723 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.01 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.322018e-01
Photon flux (15-150 keV) in 1 sec: 1.25098 ( -0.418289 0.421927 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.61438e-08 ( -2.92402e-08 2.96947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.420 sec. to 1.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.41489 ( -6.06403 2.97747 )
Epeak [keV] : 49.8991 ( -12.4519 54.3148 )
Norm@50keV : 0.430053 ( -0.471667 209.941 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 56 degrees of freedom
# Null hypothesis probability = 1.760567e-01
Photon flux (15-150 keV) in 1 sec: 1.15677 ( -0.434677 0.4352 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52795e-08 ( -2.55025e-08 2.92615e-08 ) ergs/cm2
Band function
Time interval is from 0.420 sec. to 1.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.68656 ( -3.11488 -3.14437 )
beta : -9.99945 ( 9.99945 19.9989 )
Epeak [keV] : 49.6903 ( -11.8378 55.2328 )
Norm@50keV : 0.595607 ( -0.595607 22.0217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.531670e-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] : 12.8499 (-3.07943 4.01431)
R^2/D10^2 : 0.269831 (-0.269831 0.479272)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.64 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.022468e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.450e-09 6.055e-09
25- 50 3.214e-08 2.000e-08
50-150 3.332e-08 2.313e-08
15-150 7.491e-08 4.040e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.8118 (-55.5546 -99.9555)
Norm : 5.77146 (-2.17143 3.02474)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.95 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.520046e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.508e-08 9.805e-09
25- 50 2.607e-08 1.630e-08
50-150 4.221e-08 3.414e-08
15-150 8.337e-08 5.745e-08
Double BB
R1^2/D10^2 : 4.62148E-05 (-4.6206e-05 -4.6206e-05)
kT2 [keV] : 12.0166 (-3.1639 4.44216)
R2^2/D10^2 : 0.327986 (-0.228966 0.589308)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.62 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.39 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.29 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Reduced chi-squared = 1.187 for 55 degrees of freedom
# Null hypothesis probability = 1.547553e-01
# Null hypothesis probability = 1.593213e-01
# Null hypothesis probability = 1.614696e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-08 7.130e-09
25- 50 3.182e-08 2.328e-08
50-150 3.369e-08 2.393e-08
15-150 7.572e-08 5.270e-08
Plot creation:
Sat Apr 1 05:18:17 EDT 2017