batgrbproduct analysis for trigger=846088
batgrbproduct Analysis for Trigger=846088
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 Jul 5 07:32:25 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger846088/GCN5_download_cron
======================================================================
Trigger: 00846088 Segment: 000
BAT Trigger Time: 552375424.064 [s; MET]
Trigger Stop: 552375425.088 [s; MET]
UTC: 2018-07-04T05:36:42.855940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.6378994196206 Dec: 69.9477861437904 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.74
Image Trigger?: NO
Rate S/N Ratio: 34.8711915483254 [ if not an image trigger ]
Image S/N Ratio: 7.74
Flight Position: [ source = BAT ]
RA: 32.6378994196206 Dec: 69.9477861437904 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.6046668053229 Dec: 69.9652543141675 [deg; J2000]
{ 02h 10m 25.1s , +69d 57' 54.9" }
+/- 1.32637391178373 [arcmin] (estimated 90% radius based on SNR)
+/- 0.446147074131368 [arcmin] (formal 1-sigma fit error)
SNR: 20.3180150758454
Angular difference between Flight and Ground position is 1.251208 arcmin
Partial Coding Fraction: 0.07421875 [ including projection effects ]
Duration
T90: 19.6560000181198 +/- 1.40470652898984
Measured from: -17.135999917984
to: 2.5200001001358 [s; relative to TRIGTIME]
T50: 14.5839999914169 +/- 0.811874458929508
Measured from: -14.1719999313354
to: 0.412000060081482 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0440000295639038
to: 1.0440000295639 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.8960000276566
to: 4.23599994182587 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.272124 2.400420 2.916254 1.374494
0.132978 0.151890 0.147119 0.121888 [error]
Peak 0.125747 0.341133 0.460442 0.155316
0.031547 0.039427 0.044608 0.036330 [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 6.03e-07 1.31e-06 2.25e-06 8.87e-06 6.15e-06 1.30e-05 erg/cm2
Error 7.44e-08 9.81e-08 1.41e-07 1.25e-06 3.67e-07 1.31e-06 erg/cm2
Peak flux Power-law 2.33e+00 2.97e+00 2.75e+00 4.48e+00 9.58e+00 1.25e+01 ph/cm2/s
Error 5.24e-01 4.24e-01 3.38e-01 1.10e+00 1.17e+00 1.50e+00 ph/cm2/s
Fluence Cutoff-PL 5.45e-07 1.33e-06 2.35e-06 6.04e-06 6.12e-06 1.03e-05 erg/cm2
Error 9.80e-08 1.05e-07 1.88e-07 2.66e-06 3.74e-07 2.65e-06 erg/cm2
Peak flux Cutoff-PL 1.45e+00 3.05e+00 3.37e+00 1.93e+00 9.14e+00 9.80e+00 ph/cm2/s
Error 6.51e-01 4.98e-01 5.14e-01 1.01e+00 1.19e+00 1.58e+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 1.224 0.101 - - 2.76e-02 1.66e-03 76.340 57
CPL 0.868 0.425 194.2 -59.1 3.90e-02 1.64e-02 74.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.108 0.182 - - 8.25e-02 9.68e-03 68.860 57
CPL -0.382 1.067 100.5 41.4 3.32e-01 4.01e-01 60.610 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: 21.632000 sec.
T50 in the 50-300 keV band: 15.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 22.132 -17.896 4.236
T90 19.656 -17.136 2.520
T50 14.584 -14.172 0.412
Peak 1.000 0.044 1.044
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.6047 +69.9653 0.0095 57.7 -18.1 8.3688 20.3 TRIG_00846088
------------------------------------------
Foreground time interval of the image:
-17.896 4.236 (delta_t = 22.132 [sec])
Background time interval of the image:
-239.064 -17.896 (delta_t = 221.168 [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 -17.896 sec. to 4.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22423 ( -0.101622 0.10026 )
Norm@50keV : 2.75994E-02 ( -0.00166649 0.00166048 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.34 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 57 degrees of freedom
# Null hypothesis probability = 4.453534e-02
Photon flux (15-150 keV) in 22.13 sec: 3.25111 ( -0.213211 0.214183 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.15499e-06 ( -3.67265e-07 3.67462e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.896 sec. to 4.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.868314 ( -0.45904 0.390483 )
Epeak [keV] : 194.158 ( -75.9241 -194.158 )
Norm@50keV : 3.89873E-02 ( -0.0119992 0.0208004 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.23 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 56 degrees of freedom
# Null hypothesis probability = 5.191744e-02
Photon flux (15-150 keV) in 22.13 sec: 3.19486 ( -0.22195 0.22317 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11757e-06 ( -3.74484e-07 3.73267e-07 ) ergs/cm2
Band function
Time interval is from -17.896 sec. to 4.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.777141 ( 0.777903 0.777903 )
beta : -1.48968 ( 1.47414 0.293656 )
Epeak [keV] : 158.036 ( -157.735 808.533 )
Norm@50keV : 4.33146E-02 ( -0.0141917 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.07 using 59 PHA bins.
# Reduced chi-squared = 1.347 for 55 degrees of freedom
# Null hypothesis probability = 4.416690e-02
Photon flux (15-150 keV) in 22.13 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] : 21.3197 ( )
R^2/D10^2 : 0.122675 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.22 using 59 PHA bins.
# Reduced chi-squared = 2.0740 for 57 degrees of freedom
# Null hypothesis probability = 3.566134e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.316e-07 2.775e-08
25- 50 1.202e-06 1.153e-07
50-150 4.075e-06 3.552e-07
15-150 5.509e-06 3.707e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.36952 -200)
Norm : 14.1298 (-0.8434 0.8434)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.82 using 59 PHA bins.
# Reduced chi-squared = 1.9442 for 57 degrees of freedom
# Null hypothesis probability = 2.572722e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.790e-07 5.189e-08
25- 50 1.498e-06 1.031e-07
50-150 3.286e-06 4.503e-07
15-150 5.564e-06 4.072e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.88104 (-1.87552 3.50391)
R1^2/D10^2 : 2.61260 (-1.89603 6.2522)
kT2 [keV] : 28.1980 (-3.77018 9.24907)
R2^2/D10^2 : 4.23980E-02 (-0.0272845 0.0290048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.13 using 59 PHA bins.
# Reduced chi-squared = 1.402 for 55 degrees of freedom
# Null hypothesis probability = 2.612382e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.530e-07 2.454e-07
25- 50 1.300e-06 3.339e-07
50-150 4.266e-06 7.259e-07
15-150 6.119e-06 9.793e-07
Peak spectrum fit
Power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10818 ( -0.182481 0.181336 )
Norm@50keV : 8.24875E-02 ( -0.00969931 0.00967008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.86 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.349467e-01
Photon flux (15-150 keV) in 1 sec: 9.57578 ( -1.16473 1.16941 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.60173e-07 ( -1.04046e-07 1.04244e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.381798 ( -1.19853 0.934515 )
Epeak [keV] : 100.497 ( -19.7227 63.0187 )
Norm@50keV : 0.332247 ( -0.190136 0.612077 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.61 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.130394e-01
Photon flux (15-150 keV) in 1 sec: 9.14378 ( -1.1805 1.19052 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57175e-07 ( -1.08391e-07 1.07872e-07 ) ergs/cm2
Band function
Time interval is from 0.044 sec. to 1.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.381747 ( -0.577923 1.77478 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 100.475 ( -19.704 63.0319 )
Norm@50keV : 0.332324 ( -0.190168 0.612879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.62 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 55 degrees of freedom
# Null hypothesis probability = 2.805279e-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] : 22.0991 (-2.50862 2.95355)
R^2/D10^2 : 0.358870 (-0.1215 0.172705)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.47 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.882975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.237e-08 7.610e-09
25- 50 1.716e-07 2.755e-08
50-150 6.262e-07 1.109e-07
15-150 8.302e-07 1.234e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.7898 -200)
Norm : 40.1668 (-4.82426 4.82426)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.91 using 59 PHA bins.
# Reduced chi-squared = 1.472 for 57 degrees of freedom
# Null hypothesis probability = 1.171218e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.000e-07 5.640e-08
25- 50 1.925e-07 1.071e-07
50-150 4.221e-07 2.351e-07
15-150 7.146e-07 3.942e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.71197 (-3.71149 10.1915)
R1^2/D10^2 : 55.8672 (-55.4058 -55.8678)
kT2 [keV] : 23.5920 (-3.05206 5.78112)
R2^2/D10^2 : 0.279555 (-0.175593 0.103008)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.55 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.465309e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.281e-08 2.745e-08
25- 50 1.634e-07 4.037e-08
50-150 6.363e-07 1.303e-07
15-150 8.625e-07 1.698e-07
Plot creation:
Thu Jul 5 07:35:37 EDT 2018