batgrbproduct analysis for trigger=748947
batgrbproduct Analysis for Trigger=748947
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): Thu Apr 20 10:21:09 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger748947/batgroup_hand_proc
======================================================================
Trigger: 00748947 Segment: 000
BAT Trigger Time: 514330444.992 [s; MET]
Trigger Stop: 514330446.016 [s; MET]
UTC: 2017-04-19T21:33:46.057280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 60.4979072457145 Dec: -15.1426180694188 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.51
Image Trigger?: NO
Rate S/N Ratio: 15.6204993518133 [ if not an image trigger ]
Image S/N Ratio: 9.51
Flight Position: [ source = BAT ]
RA: 60.4979072457145 Dec: -15.1426180694188 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 60.4936335918756 Dec: -15.1206290109929 [deg; J2000]
{ 04h 01m 58.5s , -15d 07' 14.3" }
+/- 1.37127183164697 [arcmin] (estimated 90% radius based on SNR)
+/- 0.643308903147621 [arcmin] (formal 1-sigma fit error)
SNR: 19.3743699048406
Angular difference between Flight and Ground position is 1.342363 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 77.1599999070168 +/- 9.82155181632793
Measured from: 1.02000004053116
to: 78.1799999475479 [s; relative to TRIGTIME]
T50: 34.2599999308586 +/- 8.42731864009818
Measured from: 3.15600001811981
to: 37.4159999489784 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.98400002717972
to: 2.98400002717972 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.276000022888184
to: 87.9959999918938 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.727888 1.031231 0.872764 0.118049
0.071076 0.073177 0.065762 0.061720 [error]
Peak 0.044988 0.096975 0.107114 0.049953
0.008913 0.009648 0.009617 0.007445 [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 2.43e-07 4.55e-07 6.58e-07 2.02e-06 1.87e-06 3.38e-06 erg/cm2
Error 3.21e-08 3.70e-08 6.51e-08 4.28e-07 1.59e-07 4.77e-07 erg/cm2
Peak flux Power-law 4.67e-01 6.90e-01 7.61e-01 1.58e+00 2.40e+00 3.50e+00 ph/cm2/s
Error 1.00e-01 9.10e-02 7.36e-02 3.34e-01 2.39e-01 3.66e-01 ph/cm2/s
Fluence Cutoff-PL 2.12e-07 4.91e-07 6.88e-07 7.28e-07 1.77e-06 2.12e-06 erg/cm2
Error 3.91e-08 4.66e-08 7.34e-08 5.62e-07 1.78e-07 5.80e-07 erg/cm2
Peak flux Cutoff-PL 4.39e-01 6.96e-01 7.83e-01 1.29e+00 2.38e+00 3.21e+00 ph/cm2/s
Error 1.22e-01 9.51e-02 8.26e-02 5.33e-01 2.44e-01 6.01e-01 ph/cm2/s
Fluence Band 2.08e-07 4.92e-07 6.80e-07 1.09e-06 1.77e-06 2.45e-06 erg/cm2
Error 4.00e-08 -------- -------- -------- -------- -------- 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 1.468 0.132 - - 2.24e-03 1.74e-04 59.340 57
CPL 0.686 0.629 84.3 56.6 5.51e-03 4.45e-03 53.870 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.858 0.168 - - 2.09e-02 2.10e-03 47.490 57
CPL 0.649 0.502 391.9 0.0 2.57e-02 1.55e-02 47.180 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: 6.400000 sec.
T50 in the 50-300 keV band: 2.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 87.720 0.276 87.996
T90 77.160 1.020 78.180
T50 34.260 3.156 37.416
Peak 1.000 1.984 2.984
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
60.4936 -15.1206 0.0099 35.1837 -38.5986 2.5599943 19.374 TRIG_00748947
Foreground time interval of the image:
0.276 56.909 (delta_t = 56.633 [sec])
Background time interval of the image:
-239.992 0.276 (delta_t = 240.268 [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 0.276 sec. to 87.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46822 ( -0.131249 0.131772 )
Norm@50keV : 2.23552E-03 ( -0.000173951 0.00017353 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.34 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.904224e-01
Photon flux (15-150 keV) in 87.72 sec: 0.276764 ( -0.0217391 0.0217749 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87037e-06 ( -1.5869e-07 1.59809e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.276 sec. to 87.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.685506 ( -0.675525 0.582544 )
Epeak [keV] : 84.2723 ( -18.8311 94.4595 )
Norm@50keV : 5.51462E-03 ( -0.00265379 0.00625266 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.87 using 59 PHA bins.
# Reduced chi-squared = 0.9620 for 56 degrees of freedom
# Null hypothesis probability = 5.558586e-01
Photon flux (15-150 keV) in 87.72 sec: 0.266848 ( -0.023021 0.022962 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76503e-06 ( -1.76738e-07 1.78265e-07 ) ergs/cm2
Band function
Time interval is from 0.276 sec. to 87.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.626872 ( -0.619847 1.57423 )
beta : -2.26027 ( 2.2012 0.648816 )
Epeak [keV] : 80.6831 ( -36.5841 84.9296 )
Norm@50keV : 5.94745E-03 ( -0.00317604 0.053758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.66 using 59 PHA bins.
# Reduced chi-squared = 0.9757 for 55 degrees of freedom
# Null hypothesis probability = 5.258380e-01
Photon flux (15-150 keV) in 87.72 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76651e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.2945 (-1.30255 1.45618)
R^2/D10^2 : 3.00012E-02 (-0.00828156 0.0111362)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.94 using 59 PHA bins.
# Reduced chi-squared = 1.297 for 57 degrees of freedom
# Null hypothesis probability = 6.513195e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.285e-07 1.732e-08
25- 50 5.195e-07 5.254e-08
50-150 8.341e-07 1.145e-07
15-150 1.482e-06 1.320e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-45.6126 -200)
Norm : 1.13738 (-0.0868622 0.0868622)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.492e-07 2.351e-08
25- 50 4.794e-07 1.156e-07
50-150 1.051e-06 4.471e-07
15-150 1.780e-06 3.645e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.70761 (-2.93319 4.39604)
R1^2/D10^2 : 0.248906 (-0.18062 1.90822)
kT2 [keV] : 21.2214 (-4.33663 19.8292)
R2^2/D10^2 : 7.73930E-03 (-0.00704125 0.0116742)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.576199e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.082e-07 9.208e-08
25- 50 4.872e-07 1.922e-07
50-150 1.026e-06 4.267e-07
15-150 1.722e-06 6.100e-07
Peak spectrum fit
Power-law model
Time interval is from 1.984 sec. to 2.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.857644 ( -0.171504 0.164615 )
Norm@50keV : 2.09038E-02 ( -0.00211365 0.00208814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.49 using 59 PHA bins.
# Reduced chi-squared = 0.8332 for 57 degrees of freedom
# Null hypothesis probability = 8.111139e-01
Photon flux (15-150 keV) in 1 sec: 2.39937 ( -0.239082 0.23985 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38558e-07 ( -2.35918e-08 2.36428e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.984 sec. to 2.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.648525 ( -0.716248 0.286837 )
Epeak [keV] : 391.939 ( -391.977 -391.977 )
Norm@50keV : 2.56533E-02 ( -0.00650744 0.0245013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.18 using 59 PHA bins.
# Reduced chi-squared = 0.8425 for 56 degrees of freedom
# Null hypothesis probability = 7.932568e-01
Photon flux (15-150 keV) in 1 sec: 2.38387 ( -0.24312 0.24402 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37357e-07 ( -2.4302e-08 2.4086e-08 ) ergs/cm2
Band function
Time interval is from 1.984 sec. to 2.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.99997 ( 9.99997 9.99997 )
beta : -0.857643 ( -0.164541 0.171504 )
Epeak [keV] : 15.2514 ( -15.2514 -15.2514 )
Norm@50keV : 2.84113 ( -0.287275 0.283811 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.49 using 59 PHA bins.
# Reduced chi-squared = 0.8635 for 55 degrees of freedom
# Null hypothesis probability = 7.539162e-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] : 24.9433 (-3.21849 4.02735)
R^2/D10^2 : 6.07059E-02 (-0.0221837 0.0324938)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.660235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.569e-09 1.417e-09
25- 50 3.722e-08 6.355e-09
50-150 1.718e-07 2.475e-08
15-150 2.156e-07 2.725e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.9371 -200)
Norm : 9.76233 (-0.997186 0.997186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.21 using 59 PHA bins.
# Reduced chi-squared = 1.670 for 57 degrees of freedom
# Null hypothesis probability = 1.127931e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.431e-08 1.343e-08
25- 50 4.677e-08 2.551e-08
50-150 1.026e-07 5.610e-08
15-150 1.737e-07 7.663e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.7778 (-3.64731 3.95006)
R1^2/D10^2 : 0.302036 (-0.155974 0.409911)
kT2 [keV] : 66.7256 (-32.4874 -69.2127)
R2^2/D10^2 : 3.14853E-03 (-0.0019983 0.0132565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.74 using 59 PHA bins.
# Reduced chi-squared = 0.8134 for 55 degrees of freedom
# Null hypothesis probability = 8.370505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.167e-08 5.382e-09
25- 50 4.462e-08 2.338e-08
50-150 1.803e-07 9.209e-08
15-150 2.366e-07 1.146e-07
Plot creation:
Thu Apr 20 11:20:34 EDT 2017