batgrbproduct Analysis for Trigger=700791
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Jun 22 08:46:14 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger700791/batgroup_hand_proc
======================================================================
Trigger: 00700791 Segment: 000
BAT Trigger Time: 488253810.296 [s; MET]
Trigger Stop: 488253810.304 [s; MET]
UTC: 2016-06-22T02:03:13.844960 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 244.373401861109 Dec: -51.0451809905403 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.22
Image Trigger?: NO
Rate S/N Ratio: 45.0777106783386 [ if not an image trigger ]
Image S/N Ratio: 10.22
Flight Position: [ source = BAT ]
RA: 244.373401861109 Dec: -51.0451809905403 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.357008749112 Dec: -51.0602711272662 [deg; J2000]
{ 16h 17m 25.7s , -51d 03' 37.0" }
+/- 1.78253574108045 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00549659274969 [arcmin] (formal 1-sigma fit error)
SNR: 13.3196346802439
Angular difference between Flight and Ground position is 1.096377 arcmin
Partial Coding Fraction: 0.71875 [ including projection effects ]
Duration
T90: 0.00800001621246338 +/- 0.0905096828275688
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
T50: 0.00800001621246338 +/- 0.064
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.00800001621246338 second)
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.00800001621246338 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.012564 0.013850 0.009919 0.001410
0.001782 0.001942 0.001701 0.000591 [error]
Peak 0.012564 0.013850 0.009919 0.001410
0.001782 0.001942 0.001701 0.000591 [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 3.50e-09 5.44e-09 6.36e-09 1.43e-08 1.95e-08 2.96e-08 erg/cm2
Error 7.44e-10 8.24e-10 1.49e-09 6.62e-09 3.55e-09 8.21e-09 erg/cm2
Peak flux Power-law 1.42e+01 1.21e+01 7.09e+00 6.20e+00 3.61e+01 3.96e+01 ph/cm2/s
Error 3.07e+00 1.84e+00 1.61e+00 2.66e+00 5.47e+00 6.16e+00 ph/cm2/s
Fluence Cutoff-PL 3.46e-09 5.64e-09 6.36e-09 9.16e-09 1.91e-08 2.46e-08 erg/cm2
Error 7.72e-10 1.11e-09 1.59e-09 1.06e-08 2.96e-09 1.11e-08 erg/cm2
Peak flux Cutoff-PL 1.40e+01 1.26e+01 7.13e+00 4.36e+00 3.60e+01 3.80e+01 ph/cm2/s
Error 3.21e+00 2.44e+00 1.69e+00 3.64e+00 5.48e+00 7.02e+00 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 1.774 0.257 - - 2.65e-01 4.66e-02 37.710 57
CPL 1.543 0.932 83.7 -0.0 3.62e-01 8.92e-01 37.540 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.774 0.257 - - 2.65e-01 4.66e-02 37.710 57
CPL 1.543 0.932 83.7 -0.0 3.62e-01 8.92e-01 37.540 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.008 0.000 0.008
T90 0.008 0.000 0.008
T50 0.008 0.000 0.008
Peak 0.008 0.000 0.008
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.3570 -51.0603 0.0144 31.1832 16.0547 0.0388731 13.320 TRIG_00700791
Foreground time interval of the image:
0.000 0.008 (delta_t = 0.008 [sec])
Background time interval of the image:
-76.995 -2.296 (delta_t = 74.699 [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 0.000 sec. to 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77428 ( -0.250442 0.262869 )
Norm@50keV : 0.264519 ( -0.0472308 0.0459381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6616 for 57 degrees of freedom
# Null hypothesis probability = 9.771938e-01
Photon flux (15-150 keV) in 0.008 sec: 36.0932 ( -5.47337 5.47354 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9502e-08 ( -3.51285e-09 3.57806e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54267 ( -1.16439 0.699015 )
Epeak [keV] : 83.6754 ( -83.7963 -83.8376 )
Norm@50keV : 0.362080 ( -0.361675 1.42183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.54 using 59 PHA bins.
# Reduced chi-squared = 0.6704 for 56 degrees of freedom
# Null hypothesis probability = 9.724843e-01
Photon flux (15-150 keV) in 0.008 sec: 35.9880 ( -5.4763 5.4883 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90728e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -12.7682 -5 )
beta : -2.00005 ( -0.50087 0.324225 )
Epeak [keV] : 24.0792 ( -9.45188 5.33904 )
Norm@50keV : 4.91435E+04 ( -7359.2 1.34701e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.98 using 59 PHA bins.
# Reduced chi-squared = 0.6360 for 55 degrees of freedom
# Null hypothesis probability = 9.838695e-01
Photon flux (15-150 keV) in 0.008 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] : 9.93701 (-1.71452 2.11612)
R^2/D10^2 : 18.0972 (-9.34513 18.4757)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 57 degrees of freedom
# Null hypothesis probability = 7.888709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.905e-09 7.476e-10
25- 50 7.159e-09 1.635e-09
50-150 3.668e-09 1.470e-09
15-150 1.373e-08 3.472e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.7269 (-41.0701 -99.7281)
Norm : 161.732 (-30.8101 39.9638)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.65 using 59 PHA bins.
# Reduced chi-squared = 0.6605 for 57 degrees of freedom
# Null hypothesis probability = 9.775938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.382e-09 6.908e-10
25- 50 5.844e-09 1.172e-09
50-150 9.456e-09 5.122e-09
15-150 1.868e-08 6.256e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12938 (-1.69508 2.04848)
R1^2/D10^2 : 51.0752 (-29.6914 49.9898)
kT2 [keV] : 35.0534 (-15.5286 -35.0534)
R2^2/D10^2 : 0.131765 (-0.128056 0.851566)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.93 using 59 PHA bins.
# Reduced chi-squared = 0.6170 for 55 degrees of freedom
# Null hypothesis probability = 9.886394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.582e-09 1.788e-09
25- 50 6.020e-09 2.942e-09
50-150 1.048e-08 5.966e-09
15-150 2.009e-08 9.272e-09
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.77428 ( -0.250442 0.262869 )
Norm@50keV : 0.264519 ( -0.0472308 0.0459381 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.71 using 59 PHA bins.
# Reduced chi-squared = 0.6616 for 57 degrees of freedom
# Null hypothesis probability = 9.771938e-01
Photon flux (15-150 keV) in 0.008 sec: 36.0932 ( -5.47337 5.47354 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9502e-08 ( -3.51285e-09 3.57806e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54267 ( -1.16439 0.699015 )
Epeak [keV] : 83.6754 ( -83.7963 -83.8376 )
Norm@50keV : 0.362080 ( -0.361675 1.42183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.54 using 59 PHA bins.
# Reduced chi-squared = 0.6704 for 56 degrees of freedom
# Null hypothesis probability = 9.724843e-01
Photon flux (15-150 keV) in 0.008 sec: 35.9880 ( -5.4763 5.4883 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90728e-08 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.008 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -12.2539 -5 )
beta : -2.00005 ( -0.50087 0.324225 )
Epeak [keV] : 24.0792 ( -9.84146 5.33911 )
Norm@50keV : 4.91435E+04 ( -7359.2 1.34701e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.98 using 59 PHA bins.
# Reduced chi-squared = 0.6360 for 55 degrees of freedom
# Null hypothesis probability = 9.838695e-01
Photon flux (15-150 keV) in 0.008 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] : 9.93701 (-1.71452 2.11612)
R^2/D10^2 : 18.0972 (-9.34513 18.4757)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.25 using 59 PHA bins.
# Reduced chi-squared = 0.8465 for 57 degrees of freedom
# Null hypothesis probability = 7.888709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.905e-09 8.748e-10
25- 50 7.159e-09 1.495e-09
50-150 3.668e-09 1.466e-09
15-150 1.373e-08 3.028e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.7269 (-41.0701 -99.7281)
Norm : 161.732 (-30.8101 39.9638)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.65 using 59 PHA bins.
# Reduced chi-squared = 0.6605 for 57 degrees of freedom
# Null hypothesis probability = 9.775938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.382e-09 6.748e-10
25- 50 5.844e-09 1.167e-09
50-150 9.456e-09 4.775e-09
15-150 1.868e-08 5.500e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.12938 (-1.69508 2.04848)
R1^2/D10^2 : 51.0752 (-29.6914 49.9898)
kT2 [keV] : 35.0534 (-15.5286 -35.0534)
R2^2/D10^2 : 0.131765 (-0.128056 0.851566)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.93 using 59 PHA bins.
# Reduced chi-squared = 0.6170 for 55 degrees of freedom
# Null hypothesis probability = 9.886394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.582e-09 1.892e-09
25- 50 6.020e-09 2.745e-09
50-150 1.048e-08 5.876e-09
15-150 2.009e-08 9.134e-09
Plot creation:
Wed Jun 22 08:59:07 EDT 2016