batgrbproduct analysis for trigger=882809
batgrbproduct Analysis for Trigger=882809
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 Jan 10 08:18:26 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger882809/GCN5_download_cron
======================================================================
Trigger: 00882809 Segment: 000
BAT Trigger Time: 568727791.424 [s; MET]
Trigger Stop: 568727792.448 [s; MET]
UTC: 2019-01-09T11:56:09.203160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 55.5953879141201 Dec: 63.5778852049672 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.64
Image Trigger?: NO
Rate S/N Ratio: 15.0332963783729 [ if not an image trigger ]
Image S/N Ratio: 8.64
Flight Position: [ source = BAT ]
RA: 55.5953879141201 Dec: 63.5778852049672 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 55.5538299704521 Dec: 63.5954927767967 [deg; J2000]
{ 03h 42m 12.9s , +63d 35' 43.8" }
+/- 1.42490842630932 [arcmin] (estimated 90% radius based on SNR)
+/- 0.566807976403862 [arcmin] (formal 1-sigma fit error)
SNR: 18.3409881553093
Angular difference between Flight and Ground position is 1.531807 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 5.92399990558624 +/- 0.771183443567822
Measured from: -2.97199988365173
to: 2.95200002193451 [s; relative to TRIGTIME]
T50: 2.80799996852875 +/- 0.855074239512648
Measured from: -1.18799996376038
to: 1.62000000476837 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.124000072479248
to: 0.875999927520752 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.23600006103516
to: 3.30799996852875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.226677 0.281054 0.213391 0.055080
0.023871 0.024232 0.020524 0.016773 [error]
Peak 0.057517 0.068353 0.060413 0.010621
0.009365 0.009621 0.008211 0.006130 [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 7.06e-08 1.23e-07 1.64e-07 4.44e-07 4.77e-07 8.01e-07 erg/cm2
Error 1.06e-08 1.15e-08 2.03e-08 1.16e-07 4.87e-08 1.33e-07 erg/cm2
Peak flux Power-law 5.63e-01 5.58e-01 3.88e-01 4.25e-01 1.68e+00 1.93e+00 ph/cm2/s
Error 1.28e-01 8.02e-02 6.70e-02 1.48e-01 2.32e-01 2.65e-01 ph/cm2/s
Fluence Cutoff-PL 6.64e-08 1.29e-07 1.67e-07 2.32e-07 4.61e-07 5.95e-07 erg/cm2
Error 1.23e-08 1.47e-08 2.19e-08 2.16e-07 5.45e-08 2.09e-07 erg/cm2
Peak flux Cutoff-PL 5.30e-01 5.80e-01 4.00e-01 2.80e-01 1.66e+00 1.79e+00 ph/cm2/s
Error 1.46e-01 9.56e-02 7.48e-02 -------- 2.36e-01 3.38e-01 ph/cm2/s
Fluence Band 6.46e-08 1.31e-07 1.63e-07 3.22e-07 4.61e-07 6.80e-07 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 1.589 0.158 - - 6.75e-03 6.39e-04 66.490 57
CPL 1.163 0.614 94.7 -30.4 1.13e-02 1.01e-02 65.150 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.526 0.229 - - 1.33e-02 1.86e-03 64.170 57
CPL 1.160 0.703 114.0 -30.0 2.06e-02 2.53e-02 63.580 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: 7.232000 sec.
T50 in the 50-300 keV band: 3.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.544 -4.236 3.308
T90 5.924 -2.972 2.952
T50 2.808 -1.188 1.620
Peak 1.000 -0.124 0.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
55.5538 +63.5955 0.0105 28.8 31.3 0.8005 18.3 TRIG_00882809
------------------------------------------
Foreground time interval of the image:
-4.236 3.308 (delta_t = 7.544 [sec])
Background time interval of the image:
-239.424 -4.236 (delta_t = 235.188 [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 -4.236 sec. to 3.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58883 ( -0.157101 0.158962 )
Norm@50keV : 6.74840E-03 ( -0.000640873 0.000636392 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.49 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.826918e-01
Photon flux (15-150 keV) in 7.544 sec: 0.864226 ( -0.0800193 0.0801301 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76776e-07 ( -4.84965e-08 4.89333e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.236 sec. to 3.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16306 ( -0.726192 0.502527 )
Epeak [keV] : 94.7489 ( -33.9878 -94.7516 )
Norm@50keV : 1.12602E-02 ( -0.00495213 0.0152686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 56 degrees of freedom
# Null hypothesis probability = 1.883907e-01
Photon flux (15-150 keV) in 7.544 sec: 0.848814 ( -0.083583 0.083155 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60689e-07 ( -5.45454e-08 5.44745e-08 ) ergs/cm2
Band function
Time interval is from -4.236 sec. to 3.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.997024 ( 0.985843 0.985843 )
beta : -1.90010 ( 1.90255 0.410041 )
Epeak [keV] : 75.8061 ( -74.4678 -74.4678 )
Norm@50keV : 1.41523E-02 ( -0.00824353 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.732775e-01
Photon flux (15-150 keV) in 7.544 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60545e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.7686 (-1.47086 1.68986)
R^2/D10^2 : 0.130492 (-0.0446533 0.0660097)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.23 using 59 PHA bins.
# Reduced chi-squared = 1.548 for 57 degrees of freedom
# Null hypothesis probability = 5.008309e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.948e-08 6.676e-09
25- 50 1.444e-07 1.705e-08
50-150 1.787e-07 3.448e-08
15-150 3.625e-07 4.440e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.518 (-62.751 -175.239)
Norm : 3.54054 (-0.342732 0.394607)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.19 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.134246e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.755e-08 1.917e-08
25- 50 1.279e-07 5.273e-08
50-150 2.684e-07 1.469e-07
15-150 4.639e-07 2.463e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40579 (-2.2479 3.88668)
R1^2/D10^2 : 1.17156 (-0.821671 2.4487)
kT2 [keV] : 22.0249 (-5.44958 32.4548)
R2^2/D10^2 : 1.90883E-02 (-0.0177365 0.0387543)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.91 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.303234e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.555e-08 3.250e-08
25- 50 1.287e-07 4.869e-08
50-150 2.550e-07 1.373e-07
15-150 4.492e-07 1.912e-07
Peak spectrum fit
Power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52573 ( -0.227259 0.230417 )
Norm@50keV : 1.33483E-02 ( -0.00186754 0.00185318 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.17 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.398500e-01
Photon flux (15-150 keV) in 1 sec: 1.67819 ( -0.231485 0.231837 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26114e-07 ( -1.90007e-08 1.92015e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16007 ( -0.955178 0.45149 )
Epeak [keV] : 113.963 ( -54.013 -113.963 )
Norm@50keV : 2.05928E-02 ( -0.00886871 0.0417281 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 56 degrees of freedom
# Null hypothesis probability = 2.271109e-01
Photon flux (15-150 keV) in 1 sec: 1.65801 ( -0.23603 0.23598 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23187e-07 ( -2.0425e-08 2.0334e-08 ) ergs/cm2
Band function
Time interval is from -0.124 sec. to 0.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16421 ( 1.16421 0.724914 )
beta : -8.75361 ( 8.7526 18.7526 )
Epeak [keV] : 115.390 ( -49.6423 -115.39 )
Norm@50keV : 2.04450E-02 ( -0.00275428 0.01911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.58 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 55 degrees of freedom
# Null hypothesis probability = 1.999917e-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] : 14.4303 (-2.52937 3.21584)
R^2/D10^2 : 0.217233 (-0.215447 0.213045)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.60 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 57 degrees of freedom
# Null hypothesis probability = 3.614376e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.524e-09 2.679e-09
25- 50 3.649e-08 7.605e-09
50-150 5.079e-08 1.432e-08
15-150 9.680e-08 1.920e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.336 (-88.9125 -199.352)
Norm : 6.88456 (-0.927272 0.928677)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.63 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.544164e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.714e-08 9.725e-09
25- 50 3.298e-08 1.847e-08
50-150 7.232e-08 4.042e-08
15-150 1.224e-07 6.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.01544 (-2.19924 2.99631)
R1^2/D10^2 : 1.83062 (-1.2537 5.13548)
kT2 [keV] : 27.0298 (-8.07189 24.937)
R2^2/D10^2 : 1.87238E-02 (-0.0164091 0.0298948)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.26 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.336927e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.678e-08 9.338e-09
25- 50 3.337e-08 1.758e-08
50-150 7.492e-08 4.090e-08
15-150 1.251e-07 5.850e-08
Plot creation:
Thu Jan 10 08:21:48 EST 2019