batgrbproduct analysis for trigger=907754
batgrbproduct Analysis for Trigger=907754
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): Tue Jun 11 13:47:35 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger907754/GCN5_download_cron
======================================================================
Trigger: 00907754 Segment: 000
BAT Trigger Time: 581858888.768 [s; MET]
Trigger Stop: 581858889.792 [s; MET]
UTC: 2019-06-10T11:27:45.716980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 46.2887188080502 Dec: -7.66601686408089 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.91
Image Trigger?: NO
Rate S/N Ratio: 45.8693797647189 [ if not an image trigger ]
Image S/N Ratio: 9.91
Flight Position: [ source = BAT ]
RA: 46.2887188080502 Dec: -7.66601686408089 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 46.2440420501839 Dec: -7.66074914095815 [deg; J2000]
{ 03h 04m 58.6s , -07d 39' 38.7" }
+/- 1.86820384939078 [arcmin] (estimated 90% radius based on SNR)
+/- 0.973474046312965 [arcmin] (formal 1-sigma fit error)
SNR: 12.4557371086476
Angular difference between Flight and Ground position is 2.675399 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.616000056266785 +/- 0.1076290421386
Measured from: 0.236000061035156
to: 0.852000117301941 [s; relative to TRIGTIME]
T50: 0.351999878883362 +/- 0.0850411706287281
Measured from: 0.360000133514404
to: 0.712000012397766 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0520000457763672
to: 1.05200004577637 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.212000012397766
to: 0.891999959945679 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.067366 0.099319 0.191101 0.135633
0.015519 0.020233 0.018748 0.022207 [error]
Peak 0.065880 0.121645 0.225713 0.142141
0.018556 0.023976 0.021660 0.026304 [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 1.18e-08 4.52e-08 1.45e-07 1.52e-06 4.07e-07 1.72e-06 erg/cm2
Error 4.24e-09 9.52e-09 1.72e-08 5.00e-07 5.16e-08 4.99e-07 erg/cm2
Peak flux Power-law 4.17e-01 8.66e-01 1.41e+00 5.15e+00 3.89e+00 7.84e+00 ph/cm2/s
Error 1.59e-01 1.98e-01 1.69e-01 1.58e+00 4.94e-01 1.47e+00 ph/cm2/s
Fluence Cutoff-PL 1.20e-08 4.55e-08 1.45e-07 1.49e-06 4.07e-07 1.69e-06 erg/cm2
Error -------- -------- 1.73e-08 7.12e-07 5.16e-08 7.08e-07 erg/cm2
Peak flux Cutoff-PL 4.25e-01 8.76e-01 1.41e+00 5.04e+00 3.90e+00 7.74e+00 ph/cm2/s
Error 1.36e-01 1.79e-01 1.69e-01 2.14e+00 4.93e-01 2.09e+00 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 0.320 0.265 - - 4.05e-02 6.33e-03 57.760 57
CPL 0.325 0.568 9999.4 0.0 4.12e-02 2.17e-02 57.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.299 0.276 - - 3.16e-02 5.11e-03 50.380 57
CPL 0.301 0.359 9999.4 0.0 3.20e-02 1.58e-02 50.400 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.680 0.212 0.892
T90 0.616 0.236 0.852
T50 0.352 0.360 0.712
Peak 1.000 0.052 1.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
46.2440 -7.6607 0.0155 13.6 -22.9 0.5291 12.5 TRIG_00907754
------------------------------------------
Foreground time interval of the image:
0.212 0.892 (delta_t = 0.680 [sec])
Background time interval of the image:
-61.367 0.212 (delta_t = 61.579 [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 0.212 sec. to 0.892 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.320014 ( -0.279308 0.251651 )
Norm@50keV : 4.05360E-02 ( -0.0064935 0.00616402 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.76 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.469494e-01
Photon flux (15-150 keV) in 0.68 sec: 4.97686 ( -0.61954 0.622129 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.0741e-07 ( -5.15379e-08 5.17343e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 0.892 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.324910 ( -0.893043 0.241987 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.11617E-02 ( -0.00658389 0.0367314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 56 degrees of freedom
# Null hypothesis probability = 4.090536e-01
Photon flux (15-150 keV) in 0.68 sec: 4.98327 ( -0.62786 0.61555 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06953e-07 ( -5.07994e-08 5.24695e-08 ) ergs/cm2
Band function
Time interval is from 0.212 sec. to 0.892 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04599 ( 1.046 1.046 )
beta : -0.319995 ( -0.251651 0.27924 )
Epeak [keV] : 12.5182 ( -12.5179 -12.5179 )
Norm@50keV : 5.89403E-02 ( -0.0241365 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.76 using 59 PHA bins.
# Reduced chi-squared = 1.050 for 55 degrees of freedom
# Null hypothesis probability = 3.736052e-01
Photon flux (15-150 keV) in 0.68 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] : 41.5985 (-8.89774 14.9376)
R^2/D10^2 : 3.50946E-02 (-0.0175723 0.0291261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.30 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.638246e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.179e-09 1.691e-09
25- 50 3.573e-08 1.087e-08
50-150 3.581e-07 9.075e-08
15-150 3.990e-07 9.112e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 17.1611 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.42 using 59 PHA bins.
# Reduced chi-squared = 2.2004 for 57 degrees of freedom
# Null hypothesis probability = 4.731977e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.906e-08 1.662e-08
25- 50 5.590e-08 3.160e-08
50-150 1.226e-07 6.827e-08
15-150 2.075e-07 1.182e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.34025 (-3.07802 6.95442)
R1^2/D10^2 : 2.92728 (-2.71285 21.8142)
kT2 [keV] : 52.6521 (-14.7337 61.2525)
R2^2/D10^2 : 1.95008E-02 (-0.0144211 0.0232095)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.05 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.353393e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.531e-08 8.777e-09
25- 50 4.103e-08 2.103e-08
50-150 3.631e-07 1.890e-07
15-150 4.194e-07 2.111e-07
Peak spectrum fit
Power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.299117 ( -0.290725 0.260643 )
Norm@50keV : 3.15523E-02 ( -0.00525573 0.00497381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.8838 for 57 degrees of freedom
# Null hypothesis probability = 7.200569e-01
Photon flux (15-150 keV) in 1 sec: 3.89338 ( -0.492584 0.495185 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71794e-07 ( -6.0069e-08 6.03053e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.300981 ( -0.466015 0.252609 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.20073E-02 ( -0.00278739 0.0288565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9000 for 56 degrees of freedom
# Null hypothesis probability = 6.859122e-01
Photon flux (15-150 keV) in 1 sec: 3.89888 ( -0.49955 0.48658 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.71002e-07 ( -5.9056e-08 6.1449e-08 ) ergs/cm2
Band function
Time interval is from 0.052 sec. to 1.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.904819 ( 0.904819 0.904819 )
beta : -0.299080 ( -0.260441 0.290689 )
Epeak [keV] : 16.7868 ( -16.7868 -16.7868 )
Norm@50keV : 4.34710E-02 ( -0.0165772 252276 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9159 for 55 degrees of freedom
# Null hypothesis probability = 6.516330e-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] : 42.7521 (-9.47824 16.3251)
R^2/D10^2 : 2.57682E-02 (-0.0132137 0.0222287)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.48 using 59 PHA bins.
# Reduced chi-squared = 0.9733 for 57 degrees of freedom
# Null hypothesis probability = 5.323742e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.790e-09 1.704e-09
25- 50 4.024e-08 1.105e-08
50-150 4.164e-07 1.060e-07
15-150 4.624e-07 1.158e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 13.6345 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.20 using 59 PHA bins.
# Reduced chi-squared = 2.0562 for 57 degrees of freedom
# Null hypothesis probability = 4.705656e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.395e-08 1.932e-08
25- 50 6.531e-08 3.723e-08
50-150 1.432e-07 8.155e-08
15-150 2.425e-07 1.371e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.55271 (-3.6336 6.78402)
R1^2/D10^2 : 2.00904 (-1.87353 60.6435)
kT2 [keV] : 54.2158 (-15.4531 80.9865)
R2^2/D10^2 : 1.43783E-02 (-0.00998745 0.0183537)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.86 using 59 PHA bins.
# Reduced chi-squared = 0.8884 for 55 degrees of freedom
# Null hypothesis probability = 7.068362e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.720e-08 1.024e-08
25- 50 4.730e-08 2.471e-08
50-150 4.217e-07 2.252e-07
15-150 4.863e-07 2.346e-07
Plot creation:
Tue Jun 11 13:51:53 EDT 2019