batgrbproduct analysis for trigger=808483
batgrbproduct Analysis for Trigger=808483
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 Feb 5 05:56:25 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger808483/GCN5_download_cron
======================================================================
Trigger: 00808483 Segment: 000
BAT Trigger Time: 539404597.364 [s; MET]
Trigger Stop: 539404597.428 [s; MET]
UTC: 2018-02-04T02:36:16.941540 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 330.117715108731 Dec: 30.8457546126038 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: NO
Rate S/N Ratio: 63.4980314655502 [ if not an image trigger ]
Image S/N Ratio: 7.65
Flight Position: [ source = BAT ]
RA: 330.117715108731 Dec: 30.8457546126038 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 330.122846349373 Dec: 30.8520940610642 [deg; J2000]
{ 22h 00m 29.5s , +30d 51' 07.5" }
+/- 1.07405278705243 [arcmin] (estimated 90% radius based on SNR)
+/- 0.374006201107476 [arcmin] (formal 1-sigma fit error)
SNR: 27.4660405289264
Angular difference between Flight and Ground position is 0.463187 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 1.16400003433228 +/- 0.117098175136296
Measured from: -0.0279998779296875
to: 1.13600015640259 [s; relative to TRIGTIME]
T50: 0.916000008583069 +/- 0.0233238344023471
Measured from: 0.0720001459121704
to: 0.988000154495239 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0519999265670776
to: 0.948000073432922 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0519999265670776
to: 1.29200005531311 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.115808 0.228388 0.237398 0.079795
0.010287 0.012497 0.012444 0.009889 [error]
Peak 0.073713 0.151475 0.171612 0.061443
0.008593 0.010624 0.010823 0.008995 [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 3.98e-08 9.41e-08 1.77e-07 8.05e-07 4.80e-07 1.12e-06 erg/cm2
Error 4.40e-09 6.29e-09 1.14e-08 1.19e-07 2.96e-08 1.22e-07 erg/cm2
Peak flux Power-law 7.89e-01 1.09e+00 1.11e+00 2.05e+00 3.64e+00 5.04e+00 ph/cm2/s
Error 1.14e-01 9.54e-02 8.28e-02 3.32e-01 2.59e-01 3.88e-01 ph/cm2/s
Fluence Cutoff-PL 3.71e-08 9.68e-08 1.84e-07 5.22e-07 4.73e-07 8.40e-07 erg/cm2
Error 5.35e-09 7.18e-09 1.38e-08 2.57e-07 3.11e-08 2.21e-07 erg/cm2
Peak flux Cutoff-PL 7.59e-01 1.10e+00 1.13e+00 1.75e+00 3.62e+00 4.74e+00 ph/cm2/s
Error 1.39e-01 9.97e-02 1.04e-01 6.28e-01 2.64e-01 6.70e-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 1.089 0.096 - - 3.40e-02 1.93e-03 71.320 57
CPL 0.765 0.381 213.4 -62.1 4.80e-02 2.00e-02 69.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.974 0.120 - - 3.17e-02 2.22e-03 62.840 57
CPL 0.821 0.355 447.5 0.0 3.71e-02 1.55e-02 62.530 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: 1.088000 sec.
T50 in the 50-300 keV band: 0.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.344 -0.052 1.292
T90 1.164 -0.028 1.136
T50 0.916 0.072 0.988
Peak 1.000 -0.052 0.948
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.1228 +30.8521 0.0070 36.8 -6.9 0.6788 27.5 TRIG_00808483
------------------------------------------
Foreground time interval of the image:
-0.052 1.292 (delta_t = 1.344 [sec])
Background time interval of the image:
-130.863 -117.305 (delta_t = 13.559 [sec])
-60.364 -0.052 (delta_t = 60.312 [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 -0.052 sec. to 1.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08886 ( -0.0966568 0.0957411 )
Norm@50keV : 3.40163E-02 ( -0.0019322 0.00193123 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.32 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 57 degrees of freedom
# Null hypothesis probability = 9.607005e-02
Photon flux (15-150 keV) in 1.344 sec: 3.94155 ( -0.229953 0.23014 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.79702e-07 ( -2.96141e-08 2.96853e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.052 sec. to 1.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.764704 ( -0.411751 0.350325 )
Epeak [keV] : 213.433 ( -89.2643 -213.441 )
Norm@50keV : 4.80252E-02 ( -0.0146745 0.0253484 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.18 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 56 degrees of freedom
# Null hypothesis probability = 1.110278e-01
Photon flux (15-150 keV) in 1.344 sec: 3.90102 ( -0.2347 0.23477 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.73165e-07 ( -3.12668e-08 3.10262e-08 ) ergs/cm2
Band function
Time interval is from -0.052 sec. to 1.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -1.18950 ( -0.114705 0.112577 )
Epeak [keV] : 29.9584 ( -10.8035 4.03717 )
Norm@50keV : 879.929 ( -49.5273 10852.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.53 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.565157e-01
Photon flux (15-150 keV) in 1.344 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] : 20.1984 ( )
R^2/D10^2 : 0.183248 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 119.63 using 59 PHA bins.
# Reduced chi-squared = 2.0988 for 57 degrees of freedom
# Null hypothesis probability = 2.417981e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.929e-08 2.312e-09
25- 50 9.673e-08 8.373e-09
50-150 2.929e-07 2.890e-08
15-150 4.090e-07 2.796e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 16.1726 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.87 using 59 PHA bins.
# Reduced chi-squared = 2.3135 for 57 degrees of freedom
# Null hypothesis probability = 7.230329e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.412e-08 3.783e-09
25- 50 1.041e-07 7.620e-09
50-150 2.283e-07 5.400e-08
15-150 3.866e-07 5.497e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.2435 (-2.44505 2.88491)
R1^2/D10^2 : 0.993468 (-0.45665 1.09324)
kT2 [keV] : 41.1453 (-11.2727 49.6967)
R2^2/D10^2 : 1.52569E-02 (-0.013039 0.0278294)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.07 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 55 degrees of freedom
# Null hypothesis probability = 1.109716e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.314e-08 7.325e-09
25- 50 1.041e-07 2.281e-08
50-150 3.399e-07 1.432e-07
15-150 4.772e-07 1.640e-07
Peak spectrum fit
Power-law model
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.974161 ( -0.121508 0.119353 )
Norm@50keV : 3.16593E-02 ( -0.00222246 0.00221698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.771301e-01
Photon flux (15-150 keV) in 1 sec: 3.64062 ( -0.259007 0.25924 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.45545e-07 ( -2.60821e-08 2.61401e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.821495 ( -0.500396 0.209643 )
Epeak [keV] : 447.482 ( -447.487 -447.487 )
Norm@50keV : 3.70539E-02 ( -0.00703675 0.0238754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.53 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 56 degrees of freedom
# Null hypothesis probability = 2.557191e-01
Photon flux (15-150 keV) in 1 sec: 3.62350 ( -0.26377 0.26385 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43811e-07 ( -2.705e-08 2.6844e-08 ) ergs/cm2
Band function
Time interval is from -0.052 sec. to 0.948 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99998 ( -4.99998 -4.99998 )
beta : -1.01586 ( -0.132435 0.131905 )
Epeak [keV] : 27.4265 ( -27.4265 6.69575 )
Norm@50keV : 1218.04 ( -83.9751 5.27106e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.78 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 55 degrees of freedom
# Null hypothesis probability = 2.200111e-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] : 22.3731 (-2.09176 2.42018)
R^2/D10^2 : 0.125233 (-0.0344011 0.0454385)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.84 using 59 PHA bins.
# Reduced chi-squared = 1.717 for 57 degrees of freedom
# Null hypothesis probability = 6.214398e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-08 1.605e-09
25- 50 6.147e-08 7.085e-09
50-150 2.299e-07 2.715e-08
15-150 3.029e-07 2.775e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 14.6260 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.34 using 59 PHA bins.
# Reduced chi-squared = 2.1814 for 57 degrees of freedom
# Null hypothesis probability = 6.445708e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.642e-08 3.200e-09
25- 50 7.006e-08 1.103e-08
50-150 1.537e-07 4.334e-08
15-150 2.601e-07 6.420e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.92183 (-2.9991 3.77809)
R1^2/D10^2 : 0.904341 (-0.505976 1.63065)
kT2 [keV] : 41.9716 (-11.9305 76.1851)
R2^2/D10^2 : 1.52831E-02 (-0.013445 0.0175056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.31 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 55 degrees of freedom
# Null hypothesis probability = 2.064607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.144e-08 7.479e-09
25- 50 6.766e-08 1.997e-08
50-150 2.577e-07 1.176e-07
15-150 3.468e-07 1.442e-07
Plot creation:
Mon Feb 5 06:03:22 EST 2018