batgrbproduct analysis for trigger=750298
batgrbproduct Analysis for Trigger=750298
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 29 12:50:38 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger750298/GCN5_download_cron
======================================================================
Trigger: 00750298 Segment: 000
BAT Trigger Time: 515063641.216 [s; MET]
Trigger Stop: 515063641.664 [s; MET]
UTC: 2017-04-28T09:13:42.238600 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 64 ms to TRIGTIME + 320 ms
BAT
RA: 330.062855519899 Dec: 26.9175780247122 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.87
Image Trigger?: NO
Rate S/N Ratio: 96.3587048480831 [ if not an image trigger ]
Image S/N Ratio: 12.87
Flight Position: [ source = BAT ]
RA: 330.062855519899 Dec: 26.9175780247122 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 330.051686185215 Dec: 26.9133614105514 [deg; J2000]
{ 22h 00m 12.4s , +26d 54' 48.1" }
+/- 1.22258224102634 [arcmin] (estimated 90% radius based on SNR)
+/- 0.462890635421912 [arcmin] (formal 1-sigma fit error)
SNR: 22.8262938740086
Angular difference between Flight and Ground position is 0.648916 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 0.199999928474426 +/- 0.0737563758292483
Measured from: 0.164000153541565
to: 0.364000082015991 [s; relative to TRIGTIME]
T50: 0.0999999642372131 +/- 0.0199999928474746
Measured from: 0.200000166893005
to: 0.300000131130219 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.199999988079071
to: 0.800000011920929 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.148000061511993
to: 0.448000013828278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.041955 0.116879 0.133820 0.075839
0.006094 0.007804 0.008795 0.007772 [error]
Peak 0.045536 0.123047 0.133935 0.082185
0.009121 0.010452 0.010620 0.009497 [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 1.53e-08 4.43e-08 1.04e-07 6.70e-07 2.82e-07 8.34e-07 erg/cm2
Error 2.25e-09 3.88e-09 7.97e-09 1.20e-07 2.21e-08 1.24e-07 erg/cm2
Peak flux Power-law 5.25e-01 7.98e-01 9.08e-01 1.97e+00 2.82e+00 4.20e+00 ph/cm2/s
Error 1.03e-01 9.42e-02 8.17e-02 3.99e-01 2.50e-01 4.26e-01 ph/cm2/s
Fluence Cutoff-PL 1.43e-08 4.53e-08 1.08e-07 4.46e-07 2.78e-07 6.14e-07 erg/cm2
Error 2.71e-09 4.33e-09 9.74e-09 2.29e-07 2.36e-08 2.34e-07 erg/cm2
Peak flux Cutoff-PL 4.97e-01 8.05e-01 9.30e-01 1.60e+00 2.80e+00 3.83e+00 ph/cm2/s
Error 9.48e-02 9.89e-02 1.02e-01 6.62e-01 2.57e-01 5.77e-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 0.765 0.123 - - 7.91e-02 5.66e-03 57.140 57
CPL 0.469 0.475 298.5 0.0 1.07e-01 5.39e-02 56.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.813 0.157 - - 2.45e-02 2.21e-03 50.410 57
CPL 0.614 0.460 409.7 0.0 3.00e-02 1.67e-02 50.070 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.300 0.148 0.448
T90 0.200 0.164 0.364
T50 0.100 0.200 0.300
Peak 1.000 -0.200 0.800
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.0517 +26.9134 0.0084 33.0 165.7 0.3698 22.8 TRIG_00750298
------------------------------------------
Foreground time interval of the image:
0.148 0.448 (delta_t = 0.300 [sec])
Background time interval of the image:
-239.216 -230.436 (delta_t = 8.780 [sec])
-179.216 0.148 (delta_t = 179.364 [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 0.148 sec. to 0.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.764783 ( -0.124445 0.121504 )
Norm@50keV : 7.91288E-02 ( -0.00566961 0.005647 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.700542e-01
Photon flux (15-150 keV) in 0.3 sec: 9.10822 ( -0.640111 0.640404 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.816e-07 ( -2.20159e-08 2.21188e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.148 sec. to 0.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.469471 ( -0.53565 0.413984 )
Epeak [keV] : 298.536 ( -298.541 -298.541 )
Norm@50keV : 0.107290 ( -0.0318865 0.0758253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.04 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.731944e-01
Photon flux (15-150 keV) in 0.3 sec: 9.02734 ( -0.65509 0.65393 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77527e-07 ( -2.37801e-08 2.33793e-08 ) ergs/cm2
Band function
Time interval is from 0.148 sec. to 0.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.989514 ( 0.989513 0.989513 )
beta : -0.764782 ( -0.121465 0.12455 )
Epeak [keV] : 13.8743 ( -13.8743 -13.8743 )
Norm@50keV : 0.113163 ( -0.0415557 1.77359e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.14 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 55 degrees of freedom
# Null hypothesis probability = 3.957258e-01
Photon flux (15-150 keV) in 0.3 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] : 23.9547 (-2.39049 2.82625)
R^2/D10^2 : 0.264490 (-0.0739527 0.0974496)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.61 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.564239e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.087e-09 1.131e-09
25- 50 4.487e-08 4.830e-09
50-150 1.918e-07 2.262e-08
15-150 2.448e-07 2.331e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 33.4782 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 158.50 using 59 PHA bins.
# Reduced chi-squared = 2.7806 for 57 degrees of freedom
# Null hypothesis probability = 1.687861e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.501e-08 2.880e-09
25- 50 4.811e-08 1.536e-08
50-150 1.055e-07 4.669e-08
15-150 1.786e-07 7.214e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 13.7475 (-3.04688 2.60143)
R1^2/D10^2 : 0.935534 (-0.351628 0.726344)
kT2 [keV] : 87.1575 (-47.8913 -91.253)
R2^2/D10^2 : 7.16795E-03 (-0.00413195 0.0318078)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.91 using 59 PHA bins.
# Reduced chi-squared = 0.9257 for 55 degrees of freedom
# Null hypothesis probability = 6.314138e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.235e-08 3.614e-09
25- 50 4.990e-08 1.708e-08
50-150 2.141e-07 1.346e-07
15-150 2.763e-07 1.537e-07
Peak spectrum fit
Power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.813336 ( -0.160249 0.154346 )
Norm@50keV : 2.45344E-02 ( -0.00222449 0.00220494 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.8844 for 57 degrees of freedom
# Null hypothesis probability = 7.189375e-01
Photon flux (15-150 keV) in 1 sec: 2.81855 ( -0.250217 0.250755 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.85112e-07 ( -2.65707e-08 2.66922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.614445 ( -0.649956 0.270884 )
Epeak [keV] : 409.747 ( -409.825 -409.825 )
Norm@50keV : 2.99577E-02 ( -0.00724691 0.0261817 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.07 using 59 PHA bins.
# Reduced chi-squared = 0.8941 for 56 degrees of freedom
# Null hypothesis probability = 6.976936e-01
Photon flux (15-150 keV) in 1 sec: 2.79799 ( -0.25704 0.25735 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82621e-07 ( -2.8273e-08 2.7823e-08 ) ergs/cm2
Band function
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.881269 ( 0.881269 0.881269 )
beta : -0.813327 ( -0.154422 0.16022 )
Epeak [keV] : 14.4016 ( -14.4016 -14.4016 )
Norm@50keV : 3.59326E-02 ( -0.0135922 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9165 for 55 degrees of freedom
# Null hypothesis probability = 6.504112e-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] : 24.5142 (-3.08887 3.82533)
R^2/D10^2 : 7.48287E-02 (-0.0262176 0.0379381)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.68 using 59 PHA bins.
# Reduced chi-squared = 1.205 for 57 degrees of freedom
# Null hypothesis probability = 1.382034e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.893e-09 1.495e-09
25- 50 4.433e-08 5.495e-09
50-150 1.980e-07 2.860e-08
15-150 2.503e-07 3.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.251 -200)
Norm : 11.0834 (-1.03753 1.03753)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 109.65 using 59 PHA bins.
# Reduced chi-squared = 1.9237 for 57 degrees of freedom
# Null hypothesis probability = 3.480085e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.759e-08 1.500e-08
25- 50 5.307e-08 1.902e-08
50-150 1.164e-07 6.327e-08
15-150 1.971e-07 8.988e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.2298 (-3.0307 2.13521)
R1^2/D10^2 : 0.391470 (-0.195056 0.428855)
kT2 [keV] : 65.1644 (-30.7319 -68.96)
R2^2/D10^2 : 4.18354E-03 (-0.00318509 0.0132855)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.11 using 59 PHA bins.
# Reduced chi-squared = 0.8384 for 55 degrees of freedom
# Null hypothesis probability = 7.976356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.397e-08 6.997e-09
25- 50 5.183e-08 2.496e-08
50-150 2.188e-07 1.114e-07
15-150 2.846e-07 1.350e-07
Plot creation:
Sat Apr 29 13:02:11 EDT 2017