batgrbproduct analysis for trigger=848048
batgrbproduct Analysis for Trigger=848048
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 Jul 16 17:34:29 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger848048/GCN5_download_cron
======================================================================
Trigger: 00848048 Segment: 000
BAT Trigger Time: 553370846.272 [s; MET]
Trigger Stop: 553370846.784 [s; MET]
UTC: 2018-07-15T18:07:05.003060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.068817047237 Dec: -0.924663860513124 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: NO
Rate S/N Ratio: 39.1918358845308 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 235.068817047237 Dec: -0.924663860513124 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.085397697848 Dec: -0.899307110107108 [deg; J2000]
{ 15h 40m 20.5s , -00d 53' 57.5" }
+/- 2.00179119822337 [arcmin] (estimated 90% radius based on SNR)
+/- 0.723649466774787 [arcmin] (formal 1-sigma fit error)
SNR: 11.2854824437598
Angular difference between Flight and Ground position is 1.817726 arcmin
Partial Coding Fraction: 0.8515625 [ including projection effects ]
Duration
T90: 0.684000015258789 +/- 0.0877268988477141
Measured from: -0.111999869346619
to: 0.57200014591217 [s; relative to TRIGTIME]
T50: 0.407999873161316 +/- 0.0863712781664672
Measured from: 0.0480002164840698
to: 0.456000089645386 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.253999948501587
to: 0.746000051498413 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.143999934196472
to: 0.632000088691711 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.024908 0.045796 0.067803 0.023057
0.006747 0.007331 0.007436 0.007025 [error]
Peak 0.024834 0.036533 0.071980 0.019659
0.007531 0.008104 0.008026 0.007543 [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 6.60e-09 1.94e-08 4.66e-08 3.09e-07 1.26e-07 3.81e-07 erg/cm2
Error 2.15e-09 3.69e-09 6.79e-09 1.14e-07 1.89e-08 1.16e-07 erg/cm2
Peak flux Power-law 1.91e-01 3.17e-01 3.98e-01 9.95e-01 1.19e+00 1.90e+00 ph/cm2/s
Error 7.24e-02 7.22e-02 6.09e-02 3.56e-01 1.87e-01 3.57e-01 ph/cm2/s
Fluence Cutoff-PL 6.28e-09 1.95e-08 4.74e-08 2.59e-07 1.26e-07 3.33e-07 erg/cm2
Error 2.69e-09 3.81e-09 8.23e-09 1.73e-07 1.46e-08 1.59e-07 erg/cm2
Peak flux Cutoff-PL 1.53e-01 3.11e-01 4.25e-01 6.43e-01 1.15e+00 1.53e+00 ph/cm2/s
Error 1.30e-01 8.29e-02 8.59e-02 4.88e-01 2.03e-01 5.20e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.72e-01 3.16e-01 4.13e-01 7.59e-01 1.17e+00 1.66e+00 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 0.737 0.266 - - 1.35e-02 1.99e-03 46.060 57
CPL 0.590 0.810 613.2 0.0 1.55e-02 1.55e-02 45.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.671 0.293 - - 1.02e-02 1.72e-03 53.370 57
CPL 0.095 1.321 221.8 0.0 1.66e-02 2.18e-02 52.830 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: 0.704000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.776 -0.144 0.632
T90 0.684 -0.112 0.572
T50 0.408 0.048 0.456
Peak 1.000 -0.254 0.746
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.0854 -0.8993 0.0170 24.7 170.9 0.1698 11.3 TRIG_00848048
------------------------------------------
Foreground time interval of the image:
-0.144 0.632 (delta_t = 0.776 [sec])
Background time interval of the image:
-239.272 -0.144 (delta_t = 239.128 [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 -0.144 sec. to 0.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.737012 ( -0.27346 0.258865 )
Norm@50keV : 1.35290E-02 ( -0.00201212 0.00197039 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.06 using 59 PHA bins.
# Reduced chi-squared = 0.8080 for 57 degrees of freedom
# Null hypothesis probability = 8.498081e-01
Photon flux (15-150 keV) in 0.776 sec: 1.55972 ( -0.220343 0.221508 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26054e-07 ( -1.88072e-08 1.89401e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.144 sec. to 0.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.589758 ( -1.23499 0.384312 )
Epeak [keV] : 613.190 ( -612.66 -612.66 )
Norm@50keV : 1.54547E-02 ( -0.00339893 0.0276462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.99 using 59 PHA bins.
# Reduced chi-squared = 0.8213 for 56 degrees of freedom
# Null hypothesis probability = 8.275524e-01
Photon flux (15-150 keV) in 0.776 sec: 1.54910 ( -0.23269 0.17216 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25572e-07 ( -1.94768e-08 9.79622e-09 ) ergs/cm2
Band function
Time interval is from -0.144 sec. to 0.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.993797 ( 0.993797 0.993797 )
beta : -0.737012 ( -0.258789 0.27346 )
Epeak [keV] : 15.8767 ( -15.8767 -15.8767 )
Norm@50keV : 1.84698E-02 ( -0.0068759 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.06 using 59 PHA bins.
# Reduced chi-squared = 0.8374 for 55 degrees of freedom
# Null hypothesis probability = 7.994041e-01
Photon flux (15-150 keV) in 0.776 sec: 1.56321 1.55041 ( ) 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] : 28.6971 (-5.27671 7.46338)
R^2/D10^2 : 2.68017E-02 (-0.0126577 0.0214519)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.08 using 59 PHA bins.
# Reduced chi-squared = 0.8961 for 57 degrees of freedom
# Null hypothesis probability = 6.957193e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.753e-09 8.257e-10
25- 50 1.666e-08 4.765e-09
50-150 9.851e-08 2.669e-08
15-150 1.179e-07 2.891e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-29.7485 -200)
Norm : 6.06821 (-0.91478 0.91478)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.20 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 57 degrees of freedom
# Null hypothesis probability = 8.460694e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.172e-08 6.732e-09
25- 50 2.255e-08 1.267e-08
50-150 4.945e-08 2.800e-08
15-150 8.371e-08 4.765e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.01234 (-2.62864 5.65668)
R1^2/D10^2 : 2.97154 (-2.77339 120.296)
kT2 [keV] : 34.0117 (-7.61493 16.3532)
R2^2/D10^2 : 1.58202E-02 (-0.0104516 0.0184585)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.04 using 59 PHA bins.
# Reduced chi-squared = 0.8008 for 55 degrees of freedom
# Null hypothesis probability = 8.551201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.714e-09 4.156e-09
25- 50 1.699e-08 6.397e-09
50-150 1.023e-07 4.311e-08
15-150 1.270e-07 5.431e-08
Peak spectrum fit
Power-law model
Time interval is from -0.254 sec. to 0.746 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.671372 ( -0.303242 0.283664 )
Norm@50keV : 1.02273E-02 ( -0.00174834 0.00169763 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9364 for 57 degrees of freedom
# Null hypothesis probability = 6.118686e-01
Photon flux (15-150 keV) in 1 sec: 1.18505 ( -0.186427 0.187634 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26475e-07 ( -2.02788e-08 2.03947e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.254 sec. to 0.746 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.50473E-02 ( -1.93679 0.704466 )
Epeak [keV] : 221.782 ( -220.965 -220.965 )
Norm@50keV : 1.66272E-02 ( -0.00785638 0.0356695 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9433 for 56 degrees of freedom
# Null hypothesis probability = 5.957512e-01
Photon flux (15-150 keV) in 1 sec: 1.15202 ( -0.204961 0.20157 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24884e-07 ( -2.132e-08 2.0976e-08 ) ergs/cm2
Band function
Time interval is from -0.254 sec. to 0.746 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04808 ( 1.04808 1.04808 )
beta : -0.671373 ( -0.283665 0.303082 )
Epeak [keV] : 16.7251 ( -16.7251 -16.7251 )
Norm@50keV : 1.35263E-02 ( -0.00493326 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9704 for 55 degrees of freedom
# Null hypothesis probability = 5.369468e-01
Photon flux (15-150 keV) in 1 sec: 1.16861 1.16183 ( ) 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] : 29.7094 (-5.63146 8.27255)
R^2/D10^2 : 1.89292E-02 (-0.00929199 0.0158027)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.24 using 59 PHA bins.
# Reduced chi-squared = 0.9517 for 57 degrees of freedom
# Null hypothesis probability = 5.790945e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.630e-09 9.855e-10
25- 50 1.616e-08 4.861e-09
50-150 1.011e-07 2.861e-08
15-150 1.199e-07 2.881e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-32.5681 -200)
Norm : 4.62985 (-0.783072 0.783072)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.83 using 59 PHA bins.
# Reduced chi-squared = 1.383 for 57 degrees of freedom
# Null hypothesis probability = 2.932344e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.152e-08 6.750e-09
25- 50 2.217e-08 1.251e-08
50-150 4.861e-08 2.751e-08
15-150 8.230e-08 4.717e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.45656 (-2.65093 4.75101)
R1^2/D10^2 : 11.5551 (-11.4495 5.98365)
kT2 [keV] : 32.3815 (-6.67589 10.9728)
R2^2/D10^2 : 1.44811E-02 (-0.00788549 0.0135881)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.62 using 59 PHA bins.
# Reduced chi-squared = 0.9022 for 55 degrees of freedom
# Null hypothesis probability = 6.796081e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.209e-09 3.622e-09
25- 50 1.554e-08 5.963e-09
50-150 1.030e-07 4.037e-08
15-150 1.258e-07 4.671e-08
Plot creation:
Mon Jul 16 17:39:24 EDT 2018