batgrbproduct analysis for trigger=830822
batgrbproduct Analysis for Trigger=830822
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 5 20:11:36 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger830822/GCN5_download_cron
======================================================================
Trigger: 00830822 Segment: 000
BAT Trigger Time: 547155994.176 [s; MET]
Trigger Stop: 547156002.368 [s; MET]
UTC: 2018-05-04T19:46:13.285300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 331.133622917772 Dec: -14.6549190111758 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.05
Image Trigger?: NO
Rate S/N Ratio: 14.2828568570857 [ if not an image trigger ]
Image S/N Ratio: 11.05
Flight Position: [ source = BAT ]
RA: 331.133622917772 Dec: -14.6549190111758 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 331.141852051527 Dec: -14.6645892510295 [deg; J2000]
{ 22h 04m 34.0s , -14d 39' 52.5" }
+/- 1.33278879234106 [arcmin] (estimated 90% radius based on SNR)
+/- 0.452271592216532 [arcmin] (formal 1-sigma fit error)
SNR: 20.1784547698079
Angular difference between Flight and Ground position is 0.751546 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 95 +/- 41.9761837236307
Measured from: -23.175999879837
to: 71.824000120163 [s; relative to TRIGTIME]
T50: 23 +/- 4.24264068711928
Measured from: -0.175999879837036
to: 22.824000120163 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.8240000009537
to: 17.8240000009537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.1759999990463
to: 116.824000000954 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.040133 1.312294 1.017887 0.218453
0.085564 0.088723 0.079265 0.070848 [error]
Peak 0.029667 0.036984 0.031264 0.019953
0.008028 0.008168 0.007354 0.006555 [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 2.98e-07 5.54e-07 7.94e-07 2.41e-06 2.26e-06 4.05e-06 erg/cm2
Error 3.82e-08 4.23e-08 7.85e-08 5.22e-07 1.88e-07 5.79e-07 erg/cm2
Peak flux Power-law 2.65e-01 2.70e-01 1.93e-01 2.21e-01 8.15e-01 9.49e-01 ph/cm2/s
Error 1.09e-01 6.67e-02 6.21e-02 1.54e-01 1.91e-01 2.31e-01 ph/cm2/s
Fluence Cutoff-PL 2.95e-07 5.57e-07 7.97e-07 2.16e-06 2.25e-06 3.66e-06 erg/cm2
Error 4.22e-08 4.71e-08 8.12e-08 9.34e-07 2.02e-07 9.23e-07 erg/cm2
Peak flux Cutoff-PL 2.74e-01 2.72e-01 1.89e-01 2.07e-01 8.17e-01 9.48e-01 ph/cm2/s
Error 1.10e-01 6.59e-02 4.79e-02 2.04e-01 1.91e-01 2.31e-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 1.480 0.134 - - 1.60e-03 1.20e-04 63.270 57
CPL 1.451 0.346 957.5 0.0 1.66e-03 8.86e-04 63.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.480 0.457 - - 6.56e-03 1.62e-03 58.400 57
CPL 1.500 0.697 9999.3 0.0 6.50e-03 7.27e-03 58.410 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: 25.088000 sec.
T50 in the 50-300 keV band: 13.696000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 148.000 -31.176 116.824
T90 95.000 -23.176 71.824
T50 23.000 -0.176 22.824
Peak 1.000 16.824 17.824
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
331.1419 -14.6646 0.0096 23.7 74.6 3.3160 20.2 TRIG_00830822
------------------------------------------
Foreground time interval of the image:
-31.176 51.425 (delta_t = 82.601 [sec])
Background time interval of the image:
-220.075 -31.176 (delta_t = 188.899 [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 -31.176 sec. to 116.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48001 ( -0.13325 0.134062 )
Norm@50keV : 1.60457E-03 ( -0.000119947 0.000119384 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.27 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 57 degrees of freedom
# Null hypothesis probability = 2.645631e-01
Photon flux (15-150 keV) in 148 sec: 0.199256 ( -0.0147373 0.0147639 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26037e-06 ( -1.87324e-07 1.88968e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.176 sec. to 116.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45130 ( -0.531722 0.160316 )
Epeak [keV] : 957.521 ( -957.674 -957.674 )
Norm@50keV : 1.65916E-03 ( -0.000452615 0.00131972 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.26 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 56 degrees of freedom
# Null hypothesis probability = 2.353959e-01
Photon flux (15-150 keV) in 148 sec: 0.198691 ( -0.015289 0.015235 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25195e-06 ( -2.06815e-07 1.96233e-07 ) ergs/cm2
Band function
Time interval is from -31.176 sec. to 116.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07784 ( 1.08475 5.70604 )
beta : -1.50736 ( 1.50846 0.160134 )
Epeak [keV] : 71.4038 ( -75.5785 -75.5785 )
Norm@50keV : 2.95885E-03 ( -0.0012836 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.086594e-01
Photon flux (15-150 keV) in 148 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] : 14.9575 (-1.45488 1.66915)
R^2/D10^2 : 2.22946E-02 (-0.00684057 0.00963445)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.53 using 59 PHA bins.
# Reduced chi-squared = 1.9568 for 57 degrees of freedom
# Null hypothesis probability = 2.134836e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.546e-07 2.088e-08
25- 50 6.128e-07 5.395e-08
50-150 9.319e-07 1.375e-07
15-150 1.699e-06 1.665e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-42.7517 -200)
Norm : 0.811508 (-0.0588923 0.0588923)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.91 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.204532e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.001e-07 2.634e-08
25- 50 5.772e-07 6.638e-08
50-150 1.266e-06 3.798e-07
15-150 2.143e-06 4.205e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.07759 (-1.85291 2.1403)
R1^2/D10^2 : 0.201882 (-0.1143 0.383787)
kT2 [keV] : 28.7378 (-7.06216 17.08)
R2^2/D10^2 : 1.90486E-03 (-0.0014548 0.00330303)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.02 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.467383e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.806e-07 8.922e-08
25- 50 5.666e-07 1.567e-07
50-150 1.401e-06 5.458e-07
15-150 2.248e-06 7.712e-07
Peak spectrum fit
Power-law model
Time interval is from 16.824 sec. to 17.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48019 ( -0.453547 0.460414 )
Norm@50keV : 6.55928E-03 ( -0.00164778 0.00158916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.238498e-01
Photon flux (15-150 keV) in 1 sec: 0.814568 ( -0.190712 0.19102 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24319e-08 ( -1.70964e-08 1.76146e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.824 sec. to 17.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50043 ( -0.947278 0.446422 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 6.49997E-03 ( -0.0016381 0.0128927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.41 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 56 degrees of freedom
# Null hypothesis probability = 3.868559e-01
Photon flux (15-150 keV) in 1 sec: 0.816686 ( -0.192288 0.189274 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22745e-08 ( -1.69396e-08 1.71947e-08 ) ergs/cm2
Band function
Time interval is from 16.824 sec. to 17.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16866 ( 1.16911 1.16911 )
beta : -1.48013 ( 1.48016 0.453515 )
Epeak [keV] : 40.7941 ( -40.6871 -40.6871 )
Norm@50keV : 1.29559E-02 ( -0.00791432 1.09453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.40 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.517312e-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] : 11.6329 (-3.57809 9.59592)
R^2/D10^2 : 0.211451 (-0.181655 0.596565)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.67 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.575747e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.033e-09 3.437e-09
25- 50 1.829e-08 9.322e-09
50-150 1.457e-08 8.999e-09
15-150 3.890e-08 2.214e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-122.067 -199.363)
Norm : 3.30857 (-0.772519 0.772514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.19 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.957084e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.239e-09 4.881e-09
25- 50 1.585e-08 9.375e-09
50-150 3.476e-08 2.040e-08
15-150 5.885e-08 3.521e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.09657 (-2.68811 3.4982)
R1^2/D10^2 : 1.01517 (-0.713267 1.25313)
kT2 [keV] : 49.0082 (-31.6703 -55.6603)
R2^2/D10^2 : 1.73037E-03 (-0.00128439 0.0129124)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.62 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.144387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.790e-09 5.175e-09
25- 50 1.503e-08 8.610e-09
50-150 4.176e-08 2.448e-08
15-150 6.557e-08 3.605e-08
Plot creation:
Sat May 5 20:16:26 EDT 2018