batgrbproduct analysis for trigger=780845
batgrbproduct Analysis for Trigger=780845
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 Oct 21 16:25:39 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger780845/GCN5_download_cron
======================================================================
Trigger: 00780845 Segment: 000
BAT Trigger Time: 530233650.624 [s; MET]
Trigger Stop: 530233658.816 [s; MET]
UTC: 2017-10-20T23:07:10.751760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.2624242628798 Dec: 15.1860174459639 [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: 17.464249196573 [ if not an image trigger ]
Image S/N Ratio: 8.64
Flight Position: [ source = BAT ]
RA: 39.2624242628798 Dec: 15.1860174459639 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 39.2594346455258 Dec: 15.1991697734915 [deg; J2000]
{ 02h 37m 02.3s , +15d 11' 57.0" }
+/- 1.80677620475069 [arcmin] (estimated 90% radius based on SNR)
+/- 0.604640018526286 [arcmin] (formal 1-sigma fit error)
SNR: 13.0650822513359
Angular difference between Flight and Ground position is 0.807903 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 42.0160000324249 +/- 9.3501486549555
Measured from: 0.248000085353851
to: 42.2640001177788 [s; relative to TRIGTIME]
T50: 17.7599999904633 +/- 4.13435942487279
Measured from: 7.09600013494492
to: 24.8560001254082 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 19.9160000085831
to: 20.9160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.967999994754791
to: 46.6800000071526 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.351091 0.463708 0.557967 0.251355
0.062316 0.064495 0.054787 0.048097 [error]
Peak 0.023555 0.034882 0.025958 0.009977
0.009014 0.009346 0.007903 0.007043 [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 9.09e-08 2.22e-07 4.31e-07 2.07e-06 1.17e-06 2.81e-06 erg/cm2
Error 2.19e-08 3.16e-08 5.16e-08 5.89e-07 1.36e-07 6.08e-07 erg/cm2
Peak flux Power-law 2.29e-01 2.43e-01 1.83e-01 2.23e-01 7.40e-01 8.78e-01 ph/cm2/s
Error 1.15e-01 7.64e-02 6.36e-02 1.64e-01 2.16e-01 2.55e-01 ph/cm2/s
Fluence Cutoff-PL 8.70e-08 2.24e-07 4.40e-07 1.63e-06 1.16e-06 2.39e-06 erg/cm2
Error 2.68e-08 3.41e-08 6.17e-08 1.03e-06 1.44e-07 8.22e-07 erg/cm2
Peak flux Cutoff-PL 2.03e-01 2.57e-01 1.93e-01 1.18e-01 7.21e-01 7.71e-01 ph/cm2/s
Error 1.73e-01 9.14e-02 7.59e-02 2.06e-01 2.30e-01 3.15e-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 1.040 0.202 - - 2.30e-03 2.60e-04 66.940 57
CPL 0.864 0.735 374.3 0.0 2.74e-03 2.45e-03 66.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.411 0.504 - - 6.06e-03 1.74e-03 66.610 57
CPL 0.787 2.628 100.0 0.0 1.23e-02 2.69e-01 66.390 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: 25.920000 sec.
T50 in the 50-300 keV band: 11.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 47.648 -0.968 46.680
T90 42.016 0.248 42.264
T50 17.760 7.096 24.856
Peak 1.000 19.916 20.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.2594 +15.1992 0.0148 28.3 74.6 1.7003 13.1 TRIG_00780845
------------------------------------------
Foreground time interval of the image:
-0.968 46.680 (delta_t = 47.648 [sec])
Background time interval of the image:
-222.423 -25.804 (delta_t = 196.619 [sec])
-24.624 -0.968 (delta_t = 23.656 [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 -0.968 sec. to 46.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03978 ( -0.206282 0.197559 )
Norm@50keV : 2.29550E-03 ( -0.000261487 0.00025934 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.94 using 59 PHA bins.
# Reduced chi-squared = 1.174 for 57 degrees of freedom
# Null hypothesis probability = 1.727567e-01
Photon flux (15-150 keV) in 47.65 sec: 0.264931 ( -0.0311156 0.0312774 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16657e-06 ( -1.35309e-07 1.35843e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.968 sec. to 46.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.864375 ( -0.958357 0.510831 )
Epeak [keV] : 374.327 ( -374.513 -374.513 )
Norm@50keV : 2.74432E-03 ( -0.000679712 0.00421594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.81 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 56 degrees of freedom
# Null hypothesis probability = 1.528778e-01
Photon flux (15-150 keV) in 47.65 sec: 0.262739 ( -0.032877 0.03259 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15702e-06 ( -1.46352e-07 1.42412e-07 ) ergs/cm2
Band function
Time interval is from -0.968 sec. to 46.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.477947 ( 0.798805 0.798805 )
beta : -1.24388 ( 1.23622 0.382696 )
Epeak [keV] : 138.971 ( -145.02 256.528 )
Norm@50keV : 4.25933E-03 ( -0.00202427 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.45 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Null hypothesis probability = 1.386723e-01
Photon flux (15-150 keV) in 47.65 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] : 21.6175 (-2.98411 3.81859)
R^2/D10^2 : 9.80046E-03 (-0.00399132 0.00615986)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.63 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 57 degrees of freedom
# Null hypothesis probability = 3.595316e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.071e-08 1.061e-08
25- 50 2.130e-07 4.429e-08
50-150 7.433e-07 1.337e-07
15-150 9.970e-07 1.544e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.13 -200)
Norm : 1.12150 (-0.128302 0.128302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.75 using 59 PHA bins.
# Reduced chi-squared = 1.504 for 57 degrees of freedom
# Null hypothesis probability = 8.207073e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.330e-07 7.529e-08
25- 50 2.559e-07 1.396e-07
50-150 5.612e-07 3.102e-07
15-150 9.501e-07 5.220e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 14.7349 (-2.72664 3.41255)
R1^2/D10^2 : 2.61944E-02 (-0.0115372 0.0330648)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 3.79110E-05 (-1.15683e-05 0.00186356)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.34 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.82 using 59 PHA bins.
# Reduced chi-squared = 1.261 for 55 degrees of freedom
# Reduced chi-squared = 1.215 for 55 degrees of freedom
# Null hypothesis probability = 9.236772e-02
# Null hypothesis probability = 1.319015e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.189e-08 4.479e-08
25- 50 2.024e-07 5.437e-08
50-150 8.041e-07 2.412e-07
15-150 1.098e-06 3.092e-07
Peak spectrum fit
Power-law model
Time interval is from 19.916 sec. to 20.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41050 ( -0.504574 0.502771 )
Norm@50keV : 6.06342E-03 ( -0.00174761 0.00173332 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.61 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 57 degrees of freedom
# Null hypothesis probability = 1.798935e-01
Photon flux (15-150 keV) in 1 sec: 0.740192 ( -0.215172 0.216444 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.84647e-08 ( -1.82101e-08 1.8611e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 19.916 sec. to 20.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.786872 ( -3.68736 1.56944 )
Epeak [keV] : 100.003 ( -99.9882 -99.9882 )
Norm@50keV : 1.23315E-02 ( -0.0123344 0.524748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 56 degrees of freedom
# Null hypothesis probability = 1.613744e-01
Photon flux (15-150 keV) in 1 sec: 0.721366 ( -0.233571 0.225657 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.61679e-08 ( -1.93016e-08 2.01472e-08 ) ergs/cm2
Band function
Time interval is from 19.916 sec. to 20.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.833864 ( 0.78296 0.78296 )
beta : -1.83465 ( 1.95085 3.91101 )
Epeak [keV] : 105.210 ( -94.588 -94.588 )
Norm@50keV : 1.15579E-02 ( -0.00746723 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.35 using 59 PHA bins.
# Reduced chi-squared = 1.206 for 55 degrees of freedom
# Null hypothesis probability = 1.404443e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.65701e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.5229 (-4.40773 6.74726)
R^2/D10^2 : 6.30305E-02 (-0.0630305 0.121914)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.69 using 59 PHA bins.
# Reduced chi-squared = 1.188 for 57 degrees of freedom
# Null hypothesis probability = 1.570950e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.531e-09 2.215e-09
25- 50 1.527e-08 9.225e-09
50-150 2.947e-08 1.891e-08
15-150 4.827e-08 3.051e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-122.834 -199.363)
Norm : 3.06755 (-0.870182 0.870217)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.71 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.777176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.638e-09 4.789e-09
25- 50 1.469e-08 9.050e-09
50-150 3.223e-08 1.956e-08
15-150 5.456e-08 3.288e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.75147 (-3.71991 4.50684)
R1^2/D10^2 : 6.69966 (-6.79133 -6.79133)
kT2 [keV] : 19.0486 (-5.73173 -19.0293)
R2^2/D10^2 : 3.55175E-02 (-0.0356025 0.093991)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.74 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.523325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.958e-09 3.999e-09
25- 50 1.352e-08 7.790e-09
50-150 3.255e-08 2.020e-08
15-150 5.303e-08 3.009e-08
Plot creation:
Sat Oct 21 16:30:34 EDT 2017