batgrbproduct analysis for trigger=755848
batgrbproduct Analysis for Trigger=755848
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): Mon Jun 5 08:07:24 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger755848/GCN5_download_cron
======================================================================
Trigger: 00755848 Segment: 000
BAT Trigger Time: 518274728 [s; MET]
Trigger Stop: 518275456 [s; MET]
UTC: 2017-06-04T13:11:48.835300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.336054516908 Dec: -60.6291653996429 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 14.58
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.58
Flight Position: [ source = BAT ]
RA: 170.336054516908 Dec: -60.6291653996429 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.322548045938 Dec: -60.620745851848 [deg; J2000]
{ 11h 21m 17.4s , -60d 37' 14.7" }
+/- 1.98538317156752 [arcmin] (estimated 90% radius based on SNR)
+/- 0.727758653370712 [arcmin] (formal 1-sigma fit error)
SNR: 11.4189578750999
Angular difference between Flight and Ground position is 0.642820 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 768.68799996376 +/- 65.0494591303918
Measured from: -19.3279998898506
to: 749.36000007391 [s; relative to TRIGTIME]
T50: 375.531999945641 +/- 71.2235649318829
Measured from: 249.988000094891
to: 625.520000040531 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 623.976000010967
to: 624.976000010967 [s; relative to TRIGTIME]
Total Fluence
Measured from: -61.3320000171661
to: 827.092000007629 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.991963 1.657007 0.661946 -0.026732
0.194214 0.196407 0.168857 0.150879 [error]
Peak 0.027589 0.011650 0.005567 0.012174
0.006444 0.006499 0.005498 0.004760 [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 1.89e-06 8.18e-07 2.11e-07 6.73e-08 2.96e-06 2.98e-06 erg/cm2
Error 1.91e-07 1.21e-07 7.51e-08 4.27e-08 2.61e-07 2.70e-07 erg/cm2
Peak flux Power-law 2.19e-01 1.19e-01 4.01e-02 1.76e-02 3.87e-01 3.95e-01 ph/cm2/s
Error 1.03e-01 6.12e-02 4.67e-02 4.60e-02 1.53e-01 1.62e-01 ph/cm2/s
Fluence Cutoff-PL 1.89e-06 8.16e-07 2.10e-07 6.59e-08 2.95e-06 2.98e-06 erg/cm2
Error 1.42e-07 1.20e-07 1.48e-07 6.00e-08 3.03e-07 3.24e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 1.12e-01 3.39e-02 1.31e-02 3.81e-01 3.85e-01 ph/cm2/s
Error 1.02e-01 6.15e-02 4.69e-02 4.62e-02 1.52e-01 1.58e-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 3.952 0.318 - - 1.56e-04 4.22e-05 73.600 57
CPL 1.892 0.000 1.2 0.0 6.55e-03 0.00e+00 75.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.563 1.188 - - 1.90e-03 1.51e-03 58.660 57
CPL 1.911 0.000 3.9 0.0 5.54e-03 0.00e+00 59.380 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 888.424 -61.332 827.092
T90 768.688 -19.328 749.360
T50 375.532 249.988 625.520
Peak 1.000 623.976 624.976
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.3225 -60.6207 0.0169 23.4 -146.2 7.7763 11.4 TRIG_00755848
------------------------------------------
Foreground time interval of the image:
-15.499 772.201 (delta_t = 787.700 [sec])
Background time interval of the image:
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 -61.332 sec. to 827.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.95193 ( -0.309927 0.326929 )
Norm@50keV : 1.56370E-04 ( -3.91042e-05 4.528e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.60 using 59 PHA bins.
# Reduced chi-squared = 1.291 for 57 degrees of freedom
# Null hypothesis probability = 6.863700e-02
Photon flux (15-150 keV) in 888.4 sec: 9.24764E-02 ( -0.00788647 0.0079116 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95558e-06 ( -2.58954e-07 2.62513e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -61.332 sec. to 827.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89157 ( )
Epeak [keV] : 1.20657 ( )
Norm@50keV : 6.55435E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.91 using 59 PHA bins.
# Reduced chi-squared = 1.355 for 56 degrees of freedom
# Null hypothesis probability = 3.949624e-02
Photon flux (15-150 keV) in 888.4 sec: 9.26927E-02 ( -0.0081993 0.0076733 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95352e-06 ( -3.57119e-07 2.49418e-07 ) ergs/cm2
Band function
Time interval is from -61.332 sec. to 827.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.26534 ( )
beta : -8.04041 ( )
Epeak [keV] : 56.0622 ( )
Norm@50keV : 8.07635E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 236.74 using 59 PHA bins.
# Reduced chi-squared = 4.3044 for 55 degrees of freedom
# Null hypothesis probability = 2.100607e-24
Photon flux (15-150 keV) in 888.4 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] : 3.80847 (-0.319704 0.358792)
R^2/D10^2 : 2.99105 (-1.21753 2.0782)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.47 using 59 PHA bins.
# Reduced chi-squared = 1.412 for 57 degrees of freedom
# Null hypothesis probability = 2.203208e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.896e-06 2.723e-07
25- 50 5.937e-07 1.183e-07
50-150 5.326e-09 3.114e-09
15-150 2.495e-06 3.394e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.00300 (-1.28879 1.63096)
Norm : 3.87887 (-1.22422 1.85191)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.29 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 57 degrees of freedom
# Null hypothesis probability = 4.490407e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.907e-06 2.652e-07
25- 50 7.089e-07 1.229e-07
50-150 3.608e-08 1.839e-08
15-150 2.652e-06 3.278e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.58919 (-0.316361 0.349004)
R1^2/D10^2 : 4.08951 (-1.72339 3.08672)
kT2 [keV] : 32.7929 (-13.0138 48.1014)
R2^2/D10^2 : 1.57807E-04 (-0.000139362 0.000592995)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.436633e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.928e-06 2.936e-07
25- 50 6.417e-07 1.541e-07
50-150 1.042e-06 6.158e-07
15-150 3.612e-06 8.742e-07
Peak spectrum fit
Power-law model
Time interval is from 623.976 sec. to 624.976 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.56298 ( -1.00304 1.37357 )
Norm@50keV : 1.89546E-03 ( -0.00141024 0.00160698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.144895e-01
Photon flux (15-150 keV) in 1 sec: 0.387186 ( -0.153298 0.153269 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92904e-08 ( -9.97892e-09 1.28863e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 623.976 sec. to 624.976 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91051 ( )
Epeak [keV] : 3.86889 ( )
Norm@50keV : 5.53660E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.38 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 56 degrees of freedom
# Null hypothesis probability = 3.536571e-01
Photon flux (15-150 keV) in 1 sec: 0.380550 ( -0.148053 0.155188 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92645e-08 ( -1.92645e-08 1.28565e-08 ) ergs/cm2
Band function
Time interval is from 623.976 sec. to 624.976 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.08343 ( 1.37195 1.37195 )
beta : -2.99688 ( 2.7556 1.17109 )
Epeak [keV] : 18.3502 ( -12.0287 94.7663 )
Norm@50keV : 747.624 ( -749.572 2.41058e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.20 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.582546e-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] : 4.73579 (-1.48599 2.21253)
R^2/D10^2 : 4.01490 (-4.01496 21.1673)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.79 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.097911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.818e-09 4.900e-09
25- 50 4.455e-09 2.975e-09
50-150 1.383e-10 1.538e-10
15-150 1.241e-08 7.600e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.7489 (-9.64263 105.411)
Norm : 5.50120 (-5.50076 16.5347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.32 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.911031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.221e-09 4.544e-09
25- 50 5.456e-09 3.835e-09
50-150 1.192e-09 1.175e-09
15-150 1.387e-08 8.995e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.50482 (-1.41459 1.64226)
R1^2/D10^2 : 4.86654 (-3.93971 9.55654)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 7.49046E-05 (-4.7656e-05 0.00140619)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.08 using 59 PHA bins.
# Reduced chi-squared = 0.9469 for 55 degrees of freedom
# Null hypothesis probability = 5.869445e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.746e-09 4.616e-09
25- 50 4.643e-09 2.653e-09
50-150 1.992e-08 6.750e-09
15-150 3.231e-08 9.940e-09
Plot creation:
Mon Jun 5 08:15:13 EDT 2017