batgrbproduct analysis for trigger=748858
batgrbproduct Analysis for Trigger=748858
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 04:36:13 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger748858/GCN5_download_cron
======================================================================
Trigger: 00748858 Segment: 000
BAT Trigger Time: 514280632 [s; MET]
Trigger Stop: 514280696 [s; MET]
UTC: 2017-04-19T07:43:33.068180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 199.853016115085 Dec: 15.4710556087952 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.16
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.16
Flight Position: [ source = BAT ]
RA: 199.853016115085 Dec: 15.4710556087952 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 199.804656266239 Dec: 15.4423384302278 [deg; J2000]
{ 13h 19m 13.1s , +15d 26' 32.4" }
+/- 2.69428082639496 [arcmin] (estimated 90% radius based on SNR)
+/- 1.49114006206732 [arcmin] (formal 1-sigma fit error)
SNR: 7.38244139170245
Angular difference between Flight and Ground position is 3.284824 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 61 +/- 15.2315462117278
Measured from: 1.00000011920929
to: 62.0000001192093 [s; relative to TRIGTIME]
T50: 33 +/- 14.422205101856
Measured from: 10.0000001192093
to: 43.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7
to: 8 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2
to: 65 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.184792 0.160783 0.026998 0.017493
0.040630 0.042125 0.036690 0.031787 [error]
Peak 0.010497 0.010961 0.005241 -0.001314
0.005022 0.005260 0.004502 0.003837 [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 4.57e-08 5.54e-08 4.87e-08 7.36e-08 1.76e-07 2.24e-07 erg/cm2
Error 1.63e-08 1.86e-08 2.91e-08 9.69e-08 7.02e-08 1.28e-07 erg/cm2
Peak flux Power-law 9.93e-02 6.84e-02 3.09e-02 1.94e-02 2.08e-01 2.17e-01 ph/cm2/s
Error 6.38e-02 3.98e-02 3.11e-02 3.48e-02 1.16e-01 1.24e-01 ph/cm2/s
Fluence Cutoff-PL 5.36e-08 6.05e-08 5.29e-10 1.10e-16 1.15e-07 1.15e-07 erg/cm2
Error 1.89e-08 2.74e-08 5.13e-09 1.48e-11 3.39e-08 3.40e-08 erg/cm2
Peak flux Cutoff-PL 7.36e-02 1.02e-01 3.40e-02 1.45e-03 2.11e-01 2.11e-01 ph/cm2/s
Error 7.59e-02 5.69e-02 3.73e-02 9.94e-03 1.12e-01 1.12e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 8.23e-02 9.71e-02 3.56e-02 2.07e-03 2.16e-01 2.11e-01 ph/cm2/s
Error 7.07e-02 -------- 3.61e-02 -------- 1.62e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.187 0.583 - - 2.79e-04 1.25e-04 58.810 57
CPL -9.965 -1.122 25.9 3.3 2.58e+05 7.41e+05 51.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.122 1.042 - - 1.31e-03 9.56e-04 67.930 57
CPL -0.947 1.055 40.5 0.0 7.77e-02 0.00e+00 65.840 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 67.000 -2.000 65.000
T90 61.000 1.000 62.000
T50 33.000 10.000 43.000
Peak 1.000 7.000 8.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
199.8047 +15.4423 0.0261 14.2 12.6 0.5868 7.4 TRIG_00748858
------------------------------------------
Foreground time interval of the image:
-2.000 65.000 (delta_t = 67.000 [sec])
Background time interval of the image:
-239.000 -2.000 (delta_t = 237.000 [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 -2.000 sec. to 65.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.18679 ( -0.535689 0.630998 )
Norm@50keV : 2.79157E-04 ( -0.000124434 0.000126436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.81 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.088425e-01
Photon flux (15-150 keV) in 67 sec: 4.58999E-02 ( -0.0140083 0.0140592 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7563e-07 ( -6.6052e-08 7.43017e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.000 sec. to 65.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.96466 ( 9.96684 7.72198 )
Epeak [keV] : 25.8521 ( -3.07928 3.43472 )
Norm@50keV : 2.58450E+05 ( -260735 1.22048e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.12 using 59 PHA bins.
# Reduced chi-squared = 0.9129 for 56 degrees of freedom
# Null hypothesis probability = 6.596371e-01
Photon flux (15-150 keV) in 67 sec: 4.30171E-02 4.27865E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.92029e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from -2.000 sec. to 65.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.18021 -5 )
beta : -4.56990 ( 4.57662 2.09004 )
Epeak [keV] : 26.1306 ( -4.71231 4.59599 )
Norm@50keV : 54.1130 ( -14.702 138.969 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.83 using 59 PHA bins.
# Reduced chi-squared = 0.9424 for 55 degrees of freedom
# Null hypothesis probability = 5.964182e-01
Photon flux (15-150 keV) in 67 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] : 6.71641 (-1.4405 1.95899)
R^2/D10^2 : 0.112122 (-0.112122 0.19018)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.35 using 59 PHA bins.
# Reduced chi-squared = 0.9534 for 57 degrees of freedom
# Null hypothesis probability = 5.753024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.205e-08 3.154e-08
25- 50 6.570e-08 3.870e-08
50-150 9.353e-09 8.281e-09
15-150 1.271e-07 7.708e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.8831 (-17.0647 58.644)
Norm : 0.331587 (-0.146742 0.280158)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.582384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.847e-08 2.369e-08
25- 50 5.989e-08 3.464e-08
50-150 3.962e-08 3.410e-08
15-150 1.480e-07 9.770e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 (-200 -200)
R1^2/D10^2 : 3.71430E-06 (-3.71124e-06 -3.71124e-06)
kT2 [keV] : 6.49203 (-1.41434 1.82708)
R2^2/D10^2 : 0.124656 (-0.0807034 0.21923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9881 for 55 degrees of freedom
# Reduced chi-squared = 0.9619 for 55 degrees of freedom
# Null hypothesis probability = 4.995650e-01
# Null hypothesis probability = 5.551222e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.224e-08 7.986e-02
25- 50 6.543e-08 6.841e-01
50-150 9.185e-09 1.575e+01
15-150 1.269e-07 1.710e+01
Peak spectrum fit
Power-law model
Time interval is from 7.000 sec. to 8.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12155 ( -0.849965 1.23321 )
Norm@50keV : 1.31032E-03 ( -0.000950936 0.000960086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.93 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.523328e-01
Photon flux (15-150 keV) in 1 sec: 0.207997 ( -0.115533 0.116129 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19864e-08 ( -7.56196e-09 8.79633e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.000 sec. to 8.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.946828 ( 1.00084 3.11028 )
Epeak [keV] : 40.5318 ( )
Norm@50keV : 7.76533E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.84 using 59 PHA bins.
# Reduced chi-squared = 1.176 for 56 degrees of freedom
# Null hypothesis probability = 1.730762e-01
Photon flux (15-150 keV) in 1 sec: 0.211198 ( -0.112164 0.11163 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18731e-08 ( -6.38019e-09 7.5119e-09 ) ergs/cm2
Band function
Time interval is from 7.000 sec. to 8.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.770499 ( -7.40145 -0.597832 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 39.9383 ( -23.2074 162.92 )
Norm@50keV : 6.44458E-02 ( -0.0642112 61.9698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.85 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 55 degrees of freedom
# Null hypothesis probability = 1.500698e-01
Photon flux (15-150 keV) in 1 sec: 0.216182 ( 6.78382 -0.216182 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20116e-08 ( -1.20046e-08 -6.54981e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.6592 (-4.47036 5.7441)
R^2/D10^2 : 9.21794E-02 (-0.0921885 0.574309)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.81 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.982864e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.173e-09 1.424e-09
25- 50 5.897e-09 3.768e-09
50-150 3.692e-09 2.929e-09
15-150 1.176e-08 8.170e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 50.2010 (-47.6163 -47.6163)
Norm : 1.25624 (-0.74308 1.78401)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.84 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.748923e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.075e-09 2.074e-09
25- 50 4.422e-09 3.029e-09
50-150 4.309e-09 3.888e-09
15-150 1.181e-08 8.460e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.88347 (-3.64589 -3.64589)
R1^2/D10^2 : 1.11952 (-1.2643 -1.2643)
kT2 [keV] : 11.6696 (-11.4421 -11.4421)
R2^2/D10^2 : 5.89231E-02 (-0.064098 0.550572)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.66 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.539241e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.573e-09 1.536e-09
25- 50 5.444e-09 3.861e-09
50-150 4.142e-09 3.234e-09
15-150 1.216e-08 9.660e-09
Plot creation:
Thu Apr 20 05:01:03 EDT 2017