batgrbproduct Analysis for Trigger=732188
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 Jan 12 21:24:48 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger732188/GCN5_download_cron
======================================================================
Trigger: 00732188 Segment: 000
BAT Trigger Time: 505879338.56 [s; MET]
Trigger Stop: 505879338.624 [s; MET]
UTC: 2017-01-12T02:02:00.112800 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 15.2313721880538 Dec: -17.1902816690652 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.88
Image Trigger?: NO
Rate S/N Ratio: 19.2093727122985 [ if not an image trigger ]
Image S/N Ratio: 7.88
Flight Position: [ source = BAT ]
RA: 15.2313721880538 Dec: -17.1902816690652 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 15.23205822117 Dec: -17.2327418353791 [deg; J2000]
{ 01h 00m 55.7s , -17d 13' 57.9" }
+/- 2.52852962344892 [arcmin] (estimated 90% radius based on SNR)
+/- 1.37263829496678 [arcmin] (formal 1-sigma fit error)
SNR: 8.08337263739774
Angular difference between Flight and Ground position is 2.547913 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0559999346733093 +/- 0.0178885800721685
Measured from: -0.00399988889694214
to: 0.0520000457763672 [s; relative to TRIGTIME]
T50: 0.0279999375343323 +/- 0.0144221847352656
Measured from: 0.0120001435279846
to: 0.0400000810623169 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.472000002861023
to: 0.527999997138977 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0559999942779541 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.001391 0.010680 0.010611 0.001273
0.001398 0.001758 0.001890 0.001255 [error]
Peak 0.008163 0.015812 0.020111 -0.003896
0.004989 0.005263 0.004939 0.004443 [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 1.16e-09 2.63e-09 4.69e-09 1.97e-08 1.28e-08 2.81e-08 erg/cm2
Error 4.42e-10 7.06e-10 1.40e-09 1.12e-08 3.65e-09 1.25e-08 erg/cm2
Peak flux Power-law 9.91e-02 1.12e-01 9.11e-02 1.23e-01 3.48e-01 4.26e-01 ph/cm2/s
Error 5.46e-02 4.12e-02 3.76e-02 1.02e-01 1.20e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 3.87e-10 3.59e-09 7.00e-09 1.32e-09 1.22e-08 1.23e-08 erg/cm2
Error 4.48e-10 1.09e-09 2.26e-09 1.98e-09 3.41e-09 3.64e-09 erg/cm2
Peak flux Cutoff-PL 5.95e-02 1.26e-01 1.12e-01 3.21e-02 3.24e-01 3.29e-01 ph/cm2/s
Error 6.61e-02 4.40e-02 5.14e-02 7.67e-02 1.23e-01 1.11e-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 1.169 0.341 - - 2.08e-02 5.38e-03 78.010 57
CPL -3.478 3.294 65.2 11.4 2.65e+00 7.94e+01 61.760 56
The chi2 of BB fit is 63.69 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 1.300 0.547 - - 2.91e-03 1.01e-03 45.110 57
CPL -0.796 4.079 72.6 -24.7 2.69e-02 1.18e+00 42.600 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.060 -0.004 0.056
T90 0.056 -0.004 0.052
T50 0.028 0.012 0.040
Peak 1.000 -0.472 0.528
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
15.2321 -17.2327 0.0239 16.1 2.0 0.0247 8.1 TRIG_00732188
------------------------------------------
Foreground time interval of the image:
-0.004 0.056 (delta_t = 0.060 [sec])
Background time interval of the image:
-239.560 -76.693 (delta_t = 162.867 [sec])
-75.560 -0.004 (delta_t = 75.556 [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 -0.004 sec. to 0.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16856 ( -0.334382 0.348148 )
Norm@50keV : 2.07753E-02 ( -0.00537909 0.0053757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.01 using 59 PHA bins.
# Reduced chi-squared = 1.369 for 57 degrees of freedom
# Null hypothesis probability = 3.377968e-02
Photon flux (15-150 keV) in 0.06 sec: 2.42783 ( -0.625229 0.626135 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27895e-08 ( -3.60249e-09 3.69544e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.47775 ( -4.13229 2.45533 )
Epeak [keV] : 65.2249 ( -10.2095 12.6004 )
Norm@50keV : 2.64971 ( -3.09461 155.63 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.76 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.779357e-01
Photon flux (15-150 keV) in 0.06 sec: 2.35575 ( -0.5777 0.60238 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22124e-08 ( -3.28506e-09 3.53106e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.73689 ( -2.96941 -4.10531 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 64.7038 ( -9.70043 14.5327 )
Norm@50keV : 3.40403 ( -3.40265 10.7443 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.75 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Null hypothesis probability = 2.475124e-01
Photon flux (15-150 keV) in 0.06 sec: 2.34858 ( 4.65142 -0.54854 ) 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] : 18.1036 (-3.19711 3.88891)
R^2/D10^2 : 0.196430 (-0.0953366 0.171037)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.69 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.527368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.720e-10 3.378e-10
25- 50 3.585e-09 1.293e-09
50-150 8.542e-09 3.914e-09
15-150 1.290e-08 5.010e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-84.704 -200)
Norm : 9.75455 (-2.54691 2.54691)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.12 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.792374e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.457e-09 9.120e-10
25- 50 2.803e-09 1.709e-09
50-150 6.148e-09 3.807e-09
15-150 1.041e-08 6.411e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08141E-02 (3.28998 -0.0508141)
R1^2/D10^2 : 5.42815E+10 (-5.42814e+10 -5.42814e+10)
kT2 [keV] : 18.0988 (-3.19863 3.88738)
R2^2/D10^2 : 0.196595 (-0.0953652 0.171012)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.69 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 55 degrees of freedom
# Null hypothesis probability = 1.971755e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.472 sec. to 0.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29992 ( -0.540311 0.554545 )
Norm@50keV : 2.91297E-03 ( -0.00101744 0.00101038 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.7913 for 57 degrees of freedom
# Null hypothesis probability = 8.726365e-01
Photon flux (15-150 keV) in 1 sec: 0.347547 ( -0.119636 0.120041 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.87751e-08 ( -1.09238e-08 1.13852e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.472 sec. to 0.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.796326 ( -5.93607 2.22103 )
Epeak [keV] : 72.5866 ( -23.5282 -72.9073 )
Norm@50keV : 2.69248E-02 ( -0.0267458 2.32738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.60 using 59 PHA bins.
# Reduced chi-squared = 0.7607 for 56 degrees of freedom
# Null hypothesis probability = 9.065795e-01
Photon flux (15-150 keV) in 1 sec: 0.324012 ( -0.123384 0.122243 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.67082e-08 ( -1.0107e-08 1.13693e-08 ) ergs/cm2
Band function
Time interval is from -0.472 sec. to 0.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.604060 ( -1.01832 0.540191 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 73.5003 ( -24.2672 241.363 )
Norm@50keV : 2.30438E-02 ( -0.0229394 1.12738 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.61 using 59 PHA bins.
# Reduced chi-squared = 0.7747 for 55 degrees of freedom
# Null hypothesis probability = 8.885971e-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] : 18.2221 (-5.34251 7.58119)
R^2/D10^2 : 2.33594E-02 (-0.0233572 0.0496594)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.56 using 59 PHA bins.
# Reduced chi-squared = 0.7467 for 57 degrees of freedom
# Null hypothesis probability = 9.225967e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.547e-09 9.910e-10
25- 50 7.219e-09 4.481e-09
50-150 1.745e-08 1.173e-08
15-150 2.622e-08 1.655e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.43520 (-0.491172 0.491173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.01 using 59 PHA bins.
# Reduced chi-squared = 0.7896 for 57 degrees of freedom
# Null hypothesis probability = 8.748504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.574e-09 2.292e-09
25- 50 6.875e-09 4.340e-09
50-150 1.508e-08 9.505e-09
15-150 2.553e-08 1.597e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.43675 (-5.41319 -5.41319)
R1^2/D10^2 : 0.360414 (-0.371434 -0.371434)
kT2 [keV] : 19.9765 (-19.9663 -19.9663)
R2^2/D10^2 : 1.59125E-02 (-0.0159547 0.0484565)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.04 using 59 PHA bins.
# Reduced chi-squared = 0.7643 for 55 degrees of freedom
# Null hypothesis probability = 9.004395e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.436e-09 1.500e-09
25- 50 7.063e-09 4.410e-09
50-150 1.809e-08 1.159e-08
15-150 2.759e-08 1.576e-08
Plot creation:
Thu Jan 12 21:45:18 EST 2017