batgrbproduct Analysis for Trigger=612974
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): Thu Sep 18 02:15:29 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger612974/GCN5_download_cron
======================================================================
Trigger: 00612974 Segment: 000
BAT Trigger Time: 432653448 [s; MET]
Trigger Stop: 432654360 [s; MET]
UTC: 2014-09-17T13:30:35.461240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.63349311699 Dec: 23.9503705825278 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.64
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.64
Flight Position: [ source = BAT ]
RA: 256.63349311699 Dec: 23.9503705825278 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.655032695048 Dec: 24.0215811720963 [deg; J2000]
{ 17h 06m 37.2s , +24d 01' 17.7" }
+/- 2.82029343462646 [arcmin] (estimated 90% radius based on SNR)
+/- 1.49312468081859 [arcmin] (formal 1-sigma fit error)
SNR: 6.91577433646333
Angular difference between Flight and Ground position is 4.432791 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 146.079999983311 +/- 25.7144166085638
Measured from: 547.25200009346
to: 693.332000076771 [s; relative to TRIGTIME]
T50: 100.727999925613 +/- 35.0724740752859
Measured from: 558.268000125885
to: 658.996000051498 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 585.980000019073
to: 586.980000019073 [s; relative to TRIGTIME]
Total Fluence
Measured from: 528.315999984741
to: 711.319999992847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.765829 0.530942 0.256490 0.046895
0.071280 0.072127 0.061614 0.053498 [error]
Peak 0.008875 0.014065 0.009869 0.008212
0.005402 0.005304 0.004751 0.003935 [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 2.27e-07 2.26e-07 1.58e-07 1.74e-07 6.79e-07 7.84e-07 erg/cm2
Error 3.71e-08 3.61e-08 5.26e-08 1.09e-07 1.20e-07 1.85e-07 erg/cm2
Peak flux Power-law 7.57e-02 8.30e-02 6.49e-02 8.35e-02 2.55e-01 3.07e-01 ph/cm2/s
Error 6.51e-02 6.29e-02 5.10e-02 1.25e-01 1.23e-01 1.51e-01 ph/cm2/s
Fluence Cutoff-PL 2.26e-07 2.29e-07 1.54e-07 1.30e-07 6.70e-07 7.39e-07 erg/cm2
Error 3.83e-08 4.22e-08 5.96e-08 1.26e-07 1.31e-07 2.13e-07 erg/cm2
Peak flux Cutoff-PL 7.81e-02 8.38e-02 6.40e-02 7.94e-02 2.56e-01 3.06e-01 ph/cm2/s
Error 6.86e-02 4.74e-02 4.05e-02 7.41e-02 1.23e-01 1.61e-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 2.519 0.320 - - 3.69e-04 8.99e-05 46.710 57
CPL 1.978 0.000 1.6 0.0 7.94e-04 0.00e+00 47.120 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.355 0.995 - - 2.11e-03 1.02e-03 52.520 57
CPL 2.162 0.000 59.3 0.0 7.57e-04 0.00e+00 52.470 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 183.004 528.316 711.320
T90 146.080 547.252 693.332
T50 100.728 558.268 658.996
Peak 1.000 585.980 586.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.6550 +24.0216 0.0278 17.9 -176.4 0.9619 6.9 TRIG_00612974
------------------------------------------
Foreground time interval of the image:
528.316 711.320 (delta_t = 183.004 [sec])
Background time interval of the image:
-150.000 -116.937 (delta_t = 33.063 [sec])
-116.000 282.650 (delta_t = 398.650 [sec])
293.000 528.316 (delta_t = 235.316 [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 528.316 sec. to 711.320 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51912 ( -0.298866 0.341373 )
Norm@50keV : 3.69236E-04 ( -9.04263e-05 8.9463e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8194 for 57 degrees of freedom
# Null hypothesis probability = 8.328477e-01
Photon flux (15-150 keV) in 183 sec: 7.33926E-02 ( -0.00970006 0.00970374 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.79217e-07 ( -1.17076e-07 1.23221e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 528.316 sec. to 711.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97832 ( )
Epeak [keV] : 1.57765 ( )
Norm@50keV : 7.94051E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.12 using 59 PHA bins.
# Reduced chi-squared = 0.8414 for 56 degrees of freedom
# Null hypothesis probability = 7.950519e-01
Photon flux (15-150 keV) in 183 sec: 7.30820E-02 ( -0.0098922 0.0098909 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.69839e-07 ( -1.29952e-07 1.31125e-07 ) ergs/cm2
Band function
Time interval is from 528.316 sec. to 711.320 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.92909 ( 2.92909 2.92909 )
beta : -2.51909 ( -0.341367 0.298784 )
Epeak [keV] : 4.14252 ( -4.14252 -4.14252 )
Norm@50keV : 5.01853E-02 ( -0.0122911 0.0121584 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8492 for 55 degrees of freedom
# Null hypothesis probability = 7.792934e-01
Photon flux (15-150 keV) in 183 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] : 6.63354 (-1.14375 1.38443)
R^2/D10^2 : 0.165368 (-0.0894899 0.205748)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.15 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.980091e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.016e-07 4.860e-08
25- 50 2.482e-07 6.792e-08
50-150 3.373e-08 1.649e-08
15-150 4.836e-07 1.046e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.0472 (-9.9204 15.6097)
Norm : 0.552002 (-0.14638 0.230821)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.90 using 59 PHA bins.
# Reduced chi-squared = 0.8579 for 57 degrees of freedom
# Null hypothesis probability = 7.686760e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.123e-07 4.019e-08
25- 50 2.514e-07 4.767e-08
50-150 1.499e-07 7.054e-08
15-150 6.136e-07 1.198e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.89961 (-1.24469 1.34257)
R1^2/D10^2 : 1.31761 (-0.953723 8.10867)
kT2 [keV] : 14.6458 (-4.56905 7.2639)
R2^2/D10^2 : 4.65568E-03 (-0.00377246 0.0184727)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.74 using 59 PHA bins.
# Reduced chi-squared = 0.8316 for 55 degrees of freedom
# Null hypothesis probability = 8.087912e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.320e-07 1.239e-07
25- 50 2.142e-07 1.110e-07
50-150 2.161e-07 1.369e-07
15-150 6.624e-07 3.504e-07
Peak spectrum fit
Power-law model
Time interval is from 585.980 sec. to 586.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35528 ( -1.01008 0.979308 )
Norm@50keV : 2.11313E-03 ( -0.00104148 0.000998615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9213 for 57 degrees of freedom
# Null hypothesis probability = 6.437603e-01
Photon flux (15-150 keV) in 1 sec: 0.254849 ( -0.122451 0.123232 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06143e-08 ( -1.0735e-08 1.11912e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 585.980 sec. to 586.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16211 ( )
Epeak [keV] : 59.2683 ( )
Norm@50keV : 7.57416E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 56 degrees of freedom
# Null hypothesis probability = 6.092424e-01
Photon flux (15-150 keV) in 1 sec: 0.255771 ( -0.123372 0.122007 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06381e-08 ( -1.09049e-08 1.10574e-08 ) ergs/cm2
Band function
Time interval is from 585.980 sec. to 586.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.05141 ( 1.04794 1.04794 )
beta : -1.35293 ( 1.35766 1.01296 )
Epeak [keV] : 51.1769 ( -53.7469 -53.7469 )
Norm@50keV : 4.00593E-03 ( -0.00400742 242344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.52 using 59 PHA bins.
# Reduced chi-squared = 0.9548 for 55 degrees of freedom
# Null hypothesis probability = 5.701053e-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] : 16.9720 (-17.0145 27.8081)
R^2/D10^2 : 1.88571E-02 (-0.0186339 0.230224)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9484 for 57 degrees of freedom
# Null hypothesis probability = 5.861905e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.107e-09 7.550e-10
25- 50 4.890e-09 3.227e-09
50-150 1.005e-08 7.470e-09
15-150 1.605e-08 1.070e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.04906 (-0.497379 0.49739)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.77 using 59 PHA bins.
# Reduced chi-squared = 0.9258 for 57 degrees of freedom
# Null hypothesis probability = 6.343531e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.612e-09 1.788e-09
25- 50 5.025e-09 3.345e-09
50-150 1.102e-08 7.250e-09
15-150 1.866e-08 1.229e-08
Double BB
R1^2/D10^2 : 9.87305E-02 (-0.792594 -0.792594)
kT2 [keV] : 86.3761 ( )
R2^2/D10^2 : 1.57397E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.74 using 59 PHA bins.
# Reduced chi-squared = 0.9599 for 55 degrees of freedom
# Reduced chi-squared = 0.9592 for 55 degrees of freedom
# Reduced chi-squared = 0.9589 for 55 degrees of freedom
# Null hypothesis probability = 5.594591e-01
# Null hypothesis probability = 5.608884e-01
# Null hypothesis probability = 5.614553e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.579e-09 1.664e-09
25- 50 4.188e-09 2.321e-09
50-150 1.318e-08 9.045e-09
15-150 1.994e-08 1.197e-08
Plot creation:
Thu Sep 18 02:19:00 EDT 2014