batgrbproduct analysis for trigger=756284
batgrbproduct Analysis for Trigger=756284
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 Jun 8 16:48:03 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger756284/GCN5_download_cron
======================================================================
Trigger: 00756284 Segment: 000
BAT Trigger Time: 518570512.896 [s; MET]
Trigger Stop: 518570513.92 [s; MET]
UTC: 2017-06-07T23:21:33.713940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 7.34357806330534 Dec: 9.23797385784254 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.32
Image Trigger?: NO
Rate S/N Ratio: 41.821047332653 [ if not an image trigger ]
Image S/N Ratio: 16.32
Flight Position: [ source = BAT ]
RA: 7.34357806330534 Dec: 9.23797385784254 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 7.35823947442841 Dec: 9.22521632937813 [deg; J2000]
{ 00h 29m 26.0s , +09d 13' 30.8" }
+/- 1.02509201171398 [arcmin] (estimated 90% radius based on SNR)
+/- 0.326706004601432 [arcmin] (formal 1-sigma fit error)
SNR: 29.3591096640411
Angular difference between Flight and Ground position is 1.157517 arcmin
Partial Coding Fraction: 0.5703125 [ including projection effects ]
Duration
T90: 320 +/- 172.325273828304
Measured from: -191.895999908447
to: 128.104000091553 [s; relative to TRIGTIME]
T50: 192 +/- 150.943698112906
Measured from: -143.895999908447
to: 48.1040000915527 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.60399997234344
to: 8.60399997234344 [s; relative to TRIGTIME]
Total Fluence
Measured from: -207.896000027657
to: 144.103999972343 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.510385 4.533360 3.210282 0.639765
0.139056 0.145310 0.127696 0.110550 [error]
Peak 0.085824 0.120849 0.083529 0.016761
0.009493 0.010314 0.008859 0.007336 [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 1.14e-06 1.96e-06 2.57e-06 6.83e-06 7.52e-06 1.25e-05 erg/cm2
Error 8.15e-08 8.07e-08 1.33e-07 7.90e-07 3.14e-07 8.75e-07 erg/cm2
Peak flux Power-law 9.50e-01 8.74e-01 5.57e-01 5.44e-01 2.61e+00 2.92e+00 ph/cm2/s
Error 1.48e-01 8.57e-02 7.61e-02 1.49e-01 2.52e-01 2.86e-01 ph/cm2/s
Fluence Cutoff-PL 1.14e-06 1.96e-06 2.57e-06 6.30e-06 7.51e-06 1.20e-05 erg/cm2
Error 6.67e-08 6.28e-08 1.34e-07 1.53e-06 3.08e-07 1.36e-06 erg/cm2
Peak flux Cutoff-PL 9.44e-01 8.74e-01 5.59e-01 5.45e-01 2.60e+00 2.92e+00 ph/cm2/s
Error 1.58e-01 9.57e-02 7.77e-02 2.34e-01 2.51e-01 3.52e-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 1.609 0.074 - - 2.29e-03 8.93e-05 43.160 57
CPL 1.609 0.103 9999.4 0.0 2.29e-03 4.12e-04 43.160 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.651 0.173 - - 2.00e-02 2.09e-03 56.680 57
CPL 1.635 0.704 998.9 -0.0 2.04e-02 1.80e-02 56.680 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: 234.048000 sec.
T50 in the 50-300 keV band: 214.208000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 352.000 -207.896 144.104
T90 320.000 -191.896 128.104
T50 192.000 -143.896 48.104
Peak 1.000 7.604 8.604
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
7.3582 +9.2252 0.0065 28.0 133.0 6.1795 29.4 TRIG_00756284
------------------------------------------
Foreground time interval of the image:
-123.395 -96.486 (delta_t = 26.909 [sec])
-95.896 13.105 (delta_t = 109.001 [sec])
Background time interval of the image:
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
-207.896000 -96.486000
-95.896000 144.104000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60915 ( -0.0734003 0.0736707 )
Norm@50keV : 2.28961E-03 ( -8.94341e-05 8.91591e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.16 using 59 PHA bins.
# Reduced chi-squared = 0.7571 for 57 degrees of freedom
# Null hypothesis probability = 9.123855e-01
Photon flux (15-150 keV) in 351.4 sec: 0.295064 ( -0.0120144 0.0120605 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.5162e-06 ( -3.12878e-07 3.14545e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-207.896000 -96.486000
-95.896000 144.104000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60947 ( -0.133701 0.0727309 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.29340E-03 ( -8.85301e-05 0.000735998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.16 using 59 PHA bins.
# Reduced chi-squared = 0.7708 for 56 degrees of freedom
# Null hypothesis probability = 8.954516e-01
Photon flux (15-150 keV) in 351.4 sec: 0.294944 ( -0.012619 0.01202 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.51409e-06 ( -3.03434e-07 3.1257e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-207.896000 -96.486000
-95.896000 144.104000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.776602 ( 1.07266 1.07266 )
beta : -1.64272 ( 1.63994 0.0913253 )
Epeak [keV] : 42.6036 ( -42.5152 468.951 )
Norm@50keV : 8.49097E-03 ( -0.00877739 314.938 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.14 using 59 PHA bins.
# Reduced chi-squared = 0.7662 for 55 degrees of freedom
# Null hypothesis probability = 8.983500e-01
Photon flux (15-150 keV) in 351.4 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] : 14.4507 ( )
R^2/D10^2 : 3.54278E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 224.78 using 59 PHA bins.
# Reduced chi-squared = 3.9435 for 57 degrees of freedom
# Null hypothesis probability = 8.830237e-22
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.472e-07 3.936e-08
25- 50 2.099e-06 1.003e-07
50-150 2.932e-06 2.430e-07
15-150 5.579e-06 2.442e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 186.675 (-37.3832 -186.676)
Norm : 1.18612 (-0.0496758 0.054778)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8367 for 57 degrees of freedom
# Null hypothesis probability = 8.054228e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.047e-06 6.431e-08
25- 50 1.997e-06 2.084e-07
50-150 4.284e-06 1.252e-06
15-150 7.328e-06 1.469e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.31097 (-0.825312 0.880395)
R1^2/D10^2 : 0.293223 (-0.0942492 0.154626)
kT2 [keV] : 30.0056 (-4.32958 6.47133)
R2^2/D10^2 : 2.15663E-03 (-0.00101719 0.00156347)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.8075 for 55 degrees of freedom
# Null hypothesis probability = 8.455973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.030e-06 1.017e-07
25- 50 2.032e-06 1.783e-07
50-150 4.453e-06 6.056e-07
15-150 7.516e-06 8.574e-07
Peak spectrum fit
Power-law model
Time interval is from 7.604 sec. to 8.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65129 ( -0.17143 0.174879 )
Norm@50keV : 1.99562E-02 ( -0.00210697 0.0020767 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 0.9944 for 57 degrees of freedom
# Null hypothesis probability = 4.870482e-01
Photon flux (15-150 keV) in 1 sec: 2.60689 ( -0.251861 0.252043 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85576e-07 ( -2.07963e-08 2.10648e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.604 sec. to 8.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63465 ( -0.634126 0.773346 )
Epeak [keV] : 998.946 ( -999.776 -999.787 )
Norm@50keV : 2.03834E-02 ( -0.0122208 0.0237478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.495471e-01
Photon flux (15-150 keV) in 1 sec: 2.60460 ( -0.24903 0.25351 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8601e-07 ( -2.3921e-08 2.0505e-08 ) ergs/cm2
Band function
Time interval is from 7.604 sec. to 8.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.25614 ( -4.25651 -4.25651 )
beta : -1.71072 ( -0.242496 0.19096 )
Epeak [keV] : 22.3372 ( -22.3304 60.3165 )
Norm@50keV : 1273.45 ( -1277.07 3.1516e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.406397e-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] : 11.9411 (-1.56012 1.91583)
R^2/D10^2 : 0.634654 (-0.264551 0.426009)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.55 using 59 PHA bins.
# Reduced chi-squared = 1.606 for 57 degrees of freedom
# Null hypothesis probability = 2.508020e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.913e-08 3.335e-09
25- 50 5.986e-08 7.165e-09
50-150 5.115e-08 1.274e-08
15-150 1.302e-07 1.770e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 158.471 (-61.6137 -157.154)
Norm : 10.6836 (-1.10834 1.44913)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.521789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.730e-08 6.845e-09
25- 50 5.101e-08 2.163e-08
50-150 1.030e-07 5.806e-08
15-150 1.813e-07 8.186e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.92897 (-1.34423 1.4736)
R1^2/D10^2 : 3.46613 (-1.70134 4.06082)
kT2 [keV] : 31.0239 (-8.49376 18.6103)
R2^2/D10^2 : 1.69036E-02 (-0.0126299 0.0334861)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.34 using 59 PHA bins.
# Reduced chi-squared = 0.9698 for 55 degrees of freedom
# Null hypothesis probability = 5.383356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.894e-08 1.088e-08
25- 50 5.110e-08 1.688e-08
50-150 1.102e-07 5.639e-08
15-150 1.902e-07 7.195e-08
Plot creation:
Thu Jun 8 17:14:13 EDT 2017