batgrbproduct analysis for trigger=754549
batgrbproduct Analysis for Trigger=754549
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 May 27 12:33:54 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger754549/batgroup_hand_proc
======================================================================
Trigger: 00754549 Segment: 000
BAT Trigger Time: 517498528.064 [s; MET]
Trigger Stop: 517498533.568 [s; MET]
UTC: 2017-05-26T13:35:08.944680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 4.7079606442867 Dec: 1.23959674361896 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.86
Image Trigger?: NO
Rate S/N Ratio: 8.88819441731559 [ if not an image trigger ]
Image S/N Ratio: 6.86
Flight Position: [ source = BAT ]
RA: 4.7079606442867 Dec: 1.23959674361896 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 4.7231725061821 Dec: 1.27658834009416 [deg; J2000]
{ 00h 18m 53.6s , +01d 16' 35.7" }
+/- 2.36801595776475 [arcmin] (estimated 90% radius based on SNR)
+/- 1.17719851355627 [arcmin] (formal 1-sigma fit error)
SNR: 8.8773471184315
Angular difference between Flight and Ground position is 2.399751 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 7.93199992179871 +/- 1.64462272071898
Measured from: 1.18400001525879
to: 9.1159999370575 [s; relative to TRIGTIME]
T50: 4.4439999461174 +/- 2.21181187580597
Measured from: 2.24799996614456
to: 6.69199991226196 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.09799998998642
to: 2.09799998998642 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.10399997234344
to: 9.96799999475479 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.092244 0.063368 0.067557 0.012333
0.017055 0.017112 0.014727 0.012433 [error]
Peak 0.013235 0.007786 0.019990 0.013005
0.005799 0.005807 0.005175 0.004131 [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 1.62e-08 3.47e-08 5.84e-08 2.24e-07 1.60e-07 3.33e-07 erg/cm2
Error 6.93e-09 8.30e-09 1.50e-08 1.44e-07 3.68e-08 1.51e-07 erg/cm2
Peak flux Power-law 6.76e-02 9.53e-02 9.96e-02 1.92e-01 3.23e-01 4.54e-01 ph/cm2/s
Error 6.22e-02 7.29e-02 4.01e-02 2.07e-01 2.28e-01 2.00e-01 ph/cm2/s
Fluence Cutoff-PL 1.64e-08 3.49e-08 5.82e-08 2.19e-07 1.60e-07 3.28e-07 erg/cm2
Error 6.92e-09 8.25e-09 1.50e-08 9.30e-08 3.53e-08 1.82e-07 erg/cm2
Peak flux Cutoff-PL 7.15e-02 9.78e-02 9.88e-02 1.81e-01 3.26e-01 4.51e-01 ph/cm2/s
Error 7.03e-02 7.30e-02 -------- 2.36e-01 1.33e-01 2.20e-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 1.251 0.425 - - 1.81e-03 3.62e-04 65.080 57
CPL 1.249 0.433 10000.0 0.0 1.82e-03 -7.26e-04 65.090 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 0.936 0.859 - - 2.81e-03 1.19e-03 84.710 57
CPL 0.954 0.867 9999.4 0.0 2.84e-03 1.27e-02 84.720 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 8.864 1.104 9.968
T90 7.932 1.184 9.116
T50 4.444 2.248 6.692
Peak 1.000 1.098 2.098
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
4.7232 1.2766 0.0215 18.2163 158.3549 0.2723052 8.877 TRIG_00754549
Foreground time interval of the image:
1.104 9.968 (delta_t = 8.864 [sec])
Background time interval of the image:
-277.163 -259.056 (delta_t = 18.107 [sec])
-239.064 1.104 (delta_t = 240.168 [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 1.104 sec. to 9.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25118 ( -0.429092 0.42029 )
Norm@50keV : 1.80902E-03 ( -0.000362487 0.00036244 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 57 degrees of freedom
# Null hypothesis probability = 2.162080e-01
Photon flux (15-150 keV) in 8.864 sec: 0.213998 ( -0.0449291 0.0450251 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60428e-07 ( -3.66041e-08 3.69655e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.104 sec. to 9.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24915 ( -0.470947 0.395353 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.81687E-03 ( -0.000364102 -0.00181688 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.09 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 56 degrees of freedom
# Null hypothesis probability = 1.897414e-01
Photon flux (15-150 keV) in 8.864 sec: 0.215430 ( -0.045969 0.043764 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59978e-07 ( -3.55092e-08 3.51883e-08 ) ergs/cm2
Band function
Time interval is from 1.104 sec. to 9.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01919 ( 1.01916 1.01916 )
beta : -1.25091 ( 1.25095 0.42901 )
Epeak [keV] : 44.5193 ( -44.5422 -44.5422 )
Norm@50keV : 3.27317E-03 ( -0.00182363 0.291893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 55 degrees of freedom
# Null hypothesis probability = 1.659643e-01
Photon flux (15-150 keV) in 8.864 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] : 23.9052 (-6.99673 11.9861)
R^2/D10^2 : 5.24230E-03 (-0.00360694 0.0104651)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.08 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 57 degrees of freedom
# Null hypothesis probability = 4.645956e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.721e-09 2.516e-09
25- 50 2.616e-08 1.283e-08
50-150 1.114e-07 5.301e-08
15-150 1.423e-07 6.032e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-80.0093 -200)
Norm : 0.882287 (-0.180868 0.180868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.06 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.498842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.948e-08 1.151e-08
25- 50 3.746e-08 2.165e-08
50-150 8.216e-08 4.689e-08
15-150 1.391e-07 8.106e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.82198 (-2.14553 3.18354)
R1^2/D10^2 : 3.20444 (-2.97321 762.402)
kT2 [keV] : 33.8334 (-11.445 35.1833)
R2^2/D10^2 : 1.72583E-03 (-0.00142791 0.00400377)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.581187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.317e-08 1.305e-08
25- 50 2.292e-08 1.159e-08
50-150 1.253e-07 7.193e-08
15-150 1.713e-07 8.641e-08
Peak spectrum fit
Power-law model
Time interval is from 1.098 sec. to 2.098 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.936476 ( -0.95268 0.765829 )
Norm@50keV : 2.81081E-03 ( -0.00126563 0.00111379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.71 using 59 PHA bins.
# Reduced chi-squared = 1.486 for 57 degrees of freedom
# Null hypothesis probability = 1.004725e-02
Photon flux (15-150 keV) in 1 sec: 0.322771 ( -0.322771 0.133469 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11119e-08 ( -1.25026e-08 1.25736e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.098 sec. to 2.098 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.953969 ( -0.985109 0.748331 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.84013E-03 ( -0.00127784 0.0241006 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.72 using 59 PHA bins.
# Reduced chi-squared = 1.513 for 56 degrees of freedom
# Null hypothesis probability = 7.903420e-03
Photon flux (15-150 keV) in 1 sec: 0.325837 ( -0.13504 0.130529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11033e-08 ( -1.24891e-08 1.24071e-08 ) ergs/cm2
Band function
Time interval is from 1.098 sec. to 2.098 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833689 ( 0.83365 0.83365 )
beta : -0.936404 ( 0.936321 0.952553 )
Epeak [keV] : 25.9577 ( -25.9584 -25.9584 )
Norm@50keV : 4.27621E-03 ( -0.0025258 0.529179 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.71 using 59 PHA bins.
# Reduced chi-squared = 1.540 for 55 degrees of freedom
# Null hypothesis probability = 6.184945e-03
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] : 29.0171 (-12.4764 63.7561)
R^2/D10^2 : 4.91338E-03 (-0.00491132 0.0229321)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.68 using 59 PHA bins.
# Reduced chi-squared = 1.521 for 57 degrees of freedom
# Null hypothesis probability = 6.831692e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.605e-10 4.499e-10
25- 50 4.018e-09 2.468e-09
50-150 2.419e-08 1.520e-08
15-150 2.887e-08 1.839e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-121.616 -199.363)
Norm : 1.35080 (-0.542127 0.542126)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.92 using 59 PHA bins.
# Reduced chi-squared = 1.525 for 57 degrees of freedom
# Null hypothesis probability = 6.512065e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.364e-09 2.182e-09
25- 50 6.470e-09 4.287e-09
50-150 1.419e-08 8.990e-09
15-150 2.402e-08 1.548e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.01605 (-2.26537 9.46564)
R1^2/D10^2 : 1.21630 (-1.19645 351.605)
kT2 [keV] : 41.9488 (-40.2524 -41.9756)
R2^2/D10^2 : 1.62932E-03 (-0.00155754 0.00423618)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.43 using 59 PHA bins.
# Reduced chi-squared = 1.517 for 55 degrees of freedom
# Null hypothesis probability = 7.997714e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.354e-09 2.247e-09
25- 50 4.444e-09 2.490e-09
50-150 2.510e-08 1.517e-08
15-150 3.289e-08 1.840e-08
Plot creation:
Sat May 27 12:57:02 EDT 2017