batgrbproduct analysis for trigger=879909
batgrbproduct Analysis for Trigger=879909
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): Fri Dec 28 23:43:34 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger879909/GCN5_download_cron
======================================================================
Trigger: 00879909 Segment: 000
BAT Trigger Time: 567658419.776 [s; MET]
Trigger Stop: 567658420.8 [s; MET]
UTC: 2018-12-28T02:53:17.622100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.8308137189391 Dec: 13.1949402078414 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.47
Image Trigger?: NO
Rate S/N Ratio: 53.7494186015068 [ if not an image trigger ]
Image S/N Ratio: 15.47
Flight Position: [ source = BAT ]
RA: 49.8308137189391 Dec: 13.1949402078414 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.8311807968298 Dec: 13.2122782351338 [deg; J2000]
{ 03h 19m 19.5s , +13d 12' 44.2" }
+/- 0.772086654678336 [arcmin] (estimated 90% radius based on SNR)
+/- 0.193602528838943 [arcmin] (formal 1-sigma fit error)
SNR: 44.0144680414987
Angular difference between Flight and Ground position is 1.040503 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 258.635999917984 +/- 42.4271867816851
Measured from: -0.955999851226807
to: 257.680000066757 [s; relative to TRIGTIME]
T50: 10.6199998855591 +/- 0.619070245463845
Measured from: 3.56400012969971
to: 14.1840000152588 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 13.1519999504089
to: 14.1519999504089 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.04000008106232
to: 338.075999975204 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.953795 5.835562 4.647001 1.262609
0.133440 0.142708 0.130020 0.114787 [error]
Peak 0.260989 0.381410 0.400911 0.144188
0.017614 0.020323 0.021079 0.016164 [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 1.33e-06 2.52e-06 3.69e-06 1.15e-05 1.04e-05 1.91e-05 erg/cm2
Error 7.90e-08 8.62e-08 1.35e-07 9.68e-07 3.30e-07 1.04e-06 erg/cm2
Peak flux Power-law 2.40e+00 2.97e+00 2.67e+00 4.17e+00 9.48e+00 1.22e+01 ph/cm2/s
Error 2.66e-01 1.94e-01 1.70e-01 5.86e-01 5.27e-01 7.21e-01 ph/cm2/s
Fluence Cutoff-PL 1.27e-06 2.55e-06 3.75e-06 8.85e-06 1.03e-05 1.64e-05 erg/cm2
Error 1.01e-07 9.37e-08 1.50e-07 2.41e-06 3.65e-07 2.32e-06 erg/cm2
Peak flux Cutoff-PL 2.41e+00 2.98e+00 2.67e+00 4.12e+00 9.48e+00 1.22e+01 ph/cm2/s
Error 2.73e-01 1.91e-01 1.70e-01 5.29e-01 5.24e-01 5.62e-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 1.451 0.056 - - 3.20e-03 9.45e-05 52.360 57
CPL 1.258 0.218 209.9 -62.7 3.93e-03 8.91e-04 50.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.152 0.101 - - 8.13e-02 4.40e-03 44.190 57
CPL 1.153 0.102 9999.4 0.0 8.15e-02 9.76e-03 44.260 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: 16.896000 sec.
T50 in the 50-300 keV band: 9.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 342.116 -4.040 338.076
T90 258.636 -0.956 257.680
T50 10.620 3.564 14.184
Peak 1.000 13.152 14.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.8312 +13.2123 0.0044 32.8 114.6 10.9299 44.0 TRIG_00879909
------------------------------------------
Foreground time interval of the image:
-4.040 13.325 (delta_t = 17.365 [sec])
Background time interval of the image:
-239.776 -162.746 (delta_t = 77.030 [sec])
-161.776 -4.040 (delta_t = 157.736 [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
Multiple GTIs in the spectrum
tstart tstop
-4.040000 168.194000
169.224000 338.076000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45122 ( -0.0559646 0.0559532 )
Norm@50keV : 3.20054E-03 ( -9.4499e-05 9.44944e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9187 for 57 degrees of freedom
# Null hypothesis probability = 6.494128e-01
Photon flux (15-150 keV) in 341.1 sec: 0.394542 ( -0.012706 0.0127409 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04444e-05 ( -3.29233e-07 3.29848e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-4.040000 168.194000
169.224000 338.076000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25831 ( -0.227099 0.208984 )
Epeak [keV] : 209.942 ( -84.4541 -209.942 )
Norm@50keV : 3.92813E-03 ( -0.000744254 0.00103868 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.05 using 59 PHA bins.
# Reduced chi-squared = 0.8937 for 56 degrees of freedom
# Null hypothesis probability = 6.985781e-01
Photon flux (15-150 keV) in 341.1 sec: 0.389148 ( -0.013942 0.013982 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03109e-05 ( -3.6583e-07 3.64022e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-4.040000 168.194000
169.224000 338.076000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02684 ( -0.412801 0.978207 )
beta : -1.54687 ( 1.54637 0.112336 )
Epeak [keV] : 101.268 ( -76.2688 2337.55 )
Norm@50keV : 5.36397E-03 ( -0.00208631 0.00659259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8969 for 55 degrees of freedom
# Null hypothesis probability = 6.901288e-01
Photon flux (15-150 keV) in 341.1 sec: 0.386959 ( ) 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] : 16.8753 ( )
R^2/D10^2 : 2.90859E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 273.80 using 59 PHA bins.
# Reduced chi-squared = 4.8036 for 57 degrees of freedom
# Null hypothesis probability = 4.298722e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.766e-07 3.223e-08
25- 50 2.536e-06 1.100e-07
50-150 5.144e-06 2.644e-07
15-150 8.257e-06 2.916e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.00321 -200)
Norm : 1.63109 (-0.0482355 0.0482355)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.92 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.201569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.386e-06 4.758e-08
25- 50 2.666e-06 9.107e-08
50-150 5.846e-06 1.944e-07
15-150 9.898e-06 3.223e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.08685 (-0.951904 0.995389)
R1^2/D10^2 : 0.236910 (-0.072447 0.121326)
kT2 [keV] : 30.5064 (-3.68004 5.21831)
R2^2/D10^2 : 3.03432E-03 (-0.00125768 0.00176777)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.78 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.084405e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.112e-06 1.126e-07
25- 50 2.644e-06 1.566e-07
50-150 6.516e-06 6.924e-07
15-150 1.027e-05 7.931e-07
Peak spectrum fit
Power-law model
Time interval is from 13.152 sec. to 14.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15246 ( -0.10089 0.100437 )
Norm@50keV : 8.12807E-02 ( -0.00439581 0.00439567 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.19 using 59 PHA bins.
# Reduced chi-squared = 0.7752 for 57 degrees of freedom
# Null hypothesis probability = 8.925886e-01
Photon flux (15-150 keV) in 1 sec: 9.48178 ( -0.526839 0.527779 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.36121e-07 ( -5.12646e-08 5.14674e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.152 sec. to 14.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15332 ( -0.10693 0.0961641 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 8.15387E-02 ( -0.00441696 0.0151038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.26 using 59 PHA bins.
# Reduced chi-squared = 0.7903 for 56 degrees of freedom
# Null hypothesis probability = 8.716483e-01
Photon flux (15-150 keV) in 1 sec: 9.48325 ( -0.52566 0.52225 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.33403e-07 ( -4.8357e-08 5.4712e-08 ) ergs/cm2
Band function
Time interval is from 13.152 sec. to 14.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.925539 ( 0.925539 0.925539 )
beta : -1.15246 ( 1.15246 0.100907 )
Epeak [keV] : 55.4451 ( -55.4451 -55.4451 )
Norm@50keV : 0.141773 ( -0.0519611 11.5029 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.19 using 59 PHA bins.
# Reduced chi-squared = 0.8034 for 55 degrees of freedom
# Null hypothesis probability = 8.515225e-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] : 20.4686 ( )
R^2/D10^2 : 0.401295 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.73 using 59 PHA bins.
# Reduced chi-squared = 2.4865 for 57 degrees of freedom
# Null hypothesis probability = 3.623212e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.211e-08 3.435e-09
25- 50 1.624e-07 1.240e-08
50-150 5.058e-07 4.865e-08
15-150 7.003e-07 5.330e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.14767 -200)
Norm : 38.8466 (-2.15756 2.15756)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.12 using 59 PHA bins.
# Reduced chi-squared = 1.616 for 57 degrees of freedom
# Null hypothesis probability = 2.220454e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.675e-08 5.730e-09
25- 50 1.861e-07 1.235e-08
50-150 4.082e-07 8.695e-08
15-150 6.911e-07 9.415e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13716 (-1.21644 1.44613)
R1^2/D10^2 : 8.09293 (-3.74667 7.78055)
kT2 [keV] : 36.6048 (-6.03095 9.82181)
R2^2/D10^2 : 5.76477E-02 (-0.0282589 0.0421468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.46 using 59 PHA bins.
# Reduced chi-squared = 0.7720 for 55 degrees of freedom
# Null hypothesis probability = 8.917757e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.815e-08 1.709e-08
25- 50 1.664e-07 2.710e-08
50-150 6.174e-07 9.980e-08
15-150 8.620e-07 1.716e-07
Plot creation:
Fri Dec 28 23:47:26 EST 2018