batgrbproduct Analysis for Trigger=616502
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): Sun Oct 26 12:48:27 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger616502/GCN5_download_cron
======================================================================
Trigger: 00616502 Segment: 000
BAT Trigger Time: 435983824 [s; MET]
Trigger Stop: 435983888 [s; MET]
UTC: 2014-10-26T02:36:51.296880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 44.0804525026473 Dec: 26.9599053858768 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 44.0804525026473 Dec: 26.9599053858768 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.04955858651 Dec: 26.9259044065715 [deg; J2000]
{ 02h 56m 11.9s , +26d 55' 33.3" }
+/- 1.85937369958922 [arcmin] (estimated 90% radius based on SNR)
+/- 0.718839930018096 [arcmin] (formal 1-sigma fit error)
SNR: 12.5403261520417
Angular difference between Flight and Ground position is 2.625337 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 148.23199993372 +/- 15.1700464169284
Measured from: 21.8480001091957
to: 170.080000042915 [s; relative to TRIGTIME]
T50: 82.6519999504089 +/- 12.4531120889135
Measured from: 46.9360001087189
to: 129.588000059128 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 65.6399999856949
to: 66.6399999856949 [s; relative to TRIGTIME]
Total Fluence
Measured from: 13.9559999704361
to: 183.044000029564 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.307452 1.065123 0.409894 0.221420
0.075412 0.077156 0.066028 0.056983 [error]
Peak 0.023252 0.006959 0.014732 0.005438
0.006168 0.006194 0.005170 0.004559 [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 3.77e-07 4.29e-07 3.50e-07 4.77e-07 1.33e-06 1.63e-06 erg/cm2
Error 4.36e-08 3.70e-08 6.17e-08 1.64e-07 1.35e-07 2.36e-07 erg/cm2
Peak flux Power-law 9.60e-02 1.13e-01 9.63e-02 1.39e-01 3.55e-01 4.44e-01 ph/cm2/s
Error 9.25e-02 5.77e-02 4.47e-02 2.00e-01 2.47e-01 1.86e-01 ph/cm2/s
Fluence Cutoff-PL 3.80e-07 4.29e-07 3.46e-07 4.61e-07 1.32e-06 1.62e-06 erg/cm2
Error 4.34e-08 3.83e-08 6.24e-08 1.31e-07 1.41e-07 3.05e-07 erg/cm2
Peak flux Cutoff-PL 9.82e-02 1.14e-01 9.55e-02 1.34e-01 3.56e-01 4.42e-01 ph/cm2/s
Error 6.44e-02 5.76e-02 4.45e-02 2.16e-01 1.36e-01 1.87e-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 2.294 0.186 - - 8.25e-04 1.03e-04 63.110 57
CPL 1.988 0.000 1.6 12.1 1.23e-03 0.00e+00 64.540 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.236 0.981 - - 3.01e-03 1.11e-03 51.900 57
CPL 3.219 0.000 329.8 0.0 3.54e-04 0.00e+00 51.540 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 169.088 13.956 183.044
T90 148.232 21.848 170.080
T50 82.652 46.936 129.588
Peak 1.000 65.640 66.640
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.0496 +26.9259 0.0153 15.7 128.9 1.2295 12.5 TRIG_00616502
------------------------------------------
Foreground time interval of the image:
13.956 73.501 (delta_t = 59.545 [sec])
Background time interval of the image:
-239.000 13.956 (delta_t = 252.956 [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 13.956 sec. to 183.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29415 ( -0.180437 0.190874 )
Norm@50keV : 8.24709E-04 ( -0.000103868 0.000101853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.693569e-01
Photon flux (15-150 keV) in 169.1 sec: 0.143657 ( -0.0117391 0.0117447 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33126e-06 ( -1.33574e-07 1.36999e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 13.956 sec. to 183.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98817 ( -1.98817 -1.98817 )
Epeak [keV] : 1.62828 ( -0.713284 23.4255 )
Norm@50keV : 1.23026E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.54 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 56 degrees of freedom
# Null hypothesis probability = 2.028286e-01
Photon flux (15-150 keV) in 169.1 sec: 0.143675 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32483e-06 ( -1.3807e-07 1.43585e-07 ) ergs/cm2
Band function
Time interval is from 13.956 sec. to 183.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62881 ( 1.62628 1.62628 )
beta : -2.30302 ( 2.30378 0.189052 )
Epeak [keV] : 11.3904 ( -11.584 135.695 )
Norm@50keV : 2.92849E-03 ( -0.00188612 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.08 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 55 degrees of freedom
# Null hypothesis probability = 2.123118e-01
Photon flux (15-150 keV) in 169.1 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] : 7.88071 (-0.783046 0.864058)
R^2/D10^2 : 0.158341 (-0.0547676 0.085403)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.75 using 59 PHA bins.
# Reduced chi-squared = 1.732 for 57 degrees of freedom
# Null hypothesis probability = 5.041561e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.973e-07 4.151e-08
25- 50 5.069e-07 5.749e-08
50-150 1.266e-07 3.545e-08
15-150 9.308e-07 9.766e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.4995 (-9.07187 13.3667)
Norm : 0.886977 (-0.149889 0.190717)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.45 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.246088e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.486e-07 3.746e-08
25- 50 4.659e-07 4.321e-08
50-150 3.750e-07 1.033e-07
15-150 1.189e-06 1.286e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.55528 (-1.65779 1.3363)
R1^2/D10^2 : 0.560128 (-0.307559 1.68373)
kT2 [keV] : 24.0444 (-11.1877 39.1407)
R2^2/D10^2 : 1.32805E-03 (-0.00116758 0.0133195)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.30 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 55 degrees of freedom
# Null hypothesis probability = 1.235144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.678e-07 9.503e-08
25- 50 4.173e-07 9.732e-08
50-150 5.701e-07 3.211e-07
15-150 1.355e-06 4.328e-07
Peak spectrum fit
Power-law model
Time interval is from 65.640 sec. to 66.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23568 ( -1.11656 0.844605 )
Norm@50keV : 3.01020E-03 ( -0.00110534 0.00110507 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9106 for 57 degrees of freedom
# Null hypothesis probability = 6.662208e-01
Photon flux (15-150 keV) in 1 sec: 0.355093 ( -0.355092 0.138447 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02579e-08 ( -1.27671e-08 1.30725e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 65.640 sec. to 66.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.21858 ( )
Epeak [keV] : 329.786 ( )
Norm@50keV : 3.54373E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9204 for 56 degrees of freedom
# Null hypothesis probability = 6.441716e-01
Photon flux (15-150 keV) in 1 sec: 0.356266 ( -0.134754 0.137072 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94382e-08 ( -1.20542e-08 1.35853e-08 ) ergs/cm2
Band function
Time interval is from 65.640 sec. to 66.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.99059 -4.99059 )
beta : -1.34058 ( -1.26992 1.11736 )
Epeak [keV] : 23.6300 ( -23.6297 47.7999 )
Norm@50keV : 377.031 ( -137.782 2.70614e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.68 using 59 PHA bins.
# Reduced chi-squared = 0.9397 for 55 degrees of freedom
# Null hypothesis probability = 6.020778e-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] : 41.8628 ( )
R^2/D10^2 : 1.74416E-03 (-0.001647 0.166402)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 0.9947 for 57 degrees of freedom
# Null hypothesis probability = 4.863181e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.462e-09 2.945e-09
25- 50 6.075e-09 4.315e-09
50-150 9.960e-10 9.885e-10
15-150 1.153e-08 8.110e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 1.46253 (-0.552369 0.552383)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.01 using 59 PHA bins.
# Reduced chi-squared = 0.9300 for 57 degrees of freedom
# Null hypothesis probability = 6.254091e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.642e-09 2.331e-09
25- 50 7.006e-09 4.575e-09
50-150 1.536e-08 9.835e-09
15-150 2.601e-08 1.638e-08
Double BB
R1^2/D10^2 : 1.57909 ( )
kT2 [keV] : 196.190 ( )
R2^2/D10^2 : 1.00668E-04 (-4.75446e-05 0.00336419)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.50 using 59 PHA bins.
#Fit statistic : Chi-Squared = 47.47 using 59 PHA bins.
# Reduced chi-squared = 0.8837 for 55 degrees of freedom
# Reduced chi-squared = 0.8636 for 55 degrees of freedom
# Reduced chi-squared = 0.8632 for 55 degrees of freedom
# Null hypothesis probability = 7.160516e-01
# Null hypothesis probability = 7.537581e-01
# Null hypothesis probability = 7.545263e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.666e-09 2.496e-09
25- 50 5.933e-09 3.657e-09
50-150 2.663e-08 1.624e-08
15-150 3.623e-08 1.794e-08
Plot creation:
Sun Oct 26 12:53:37 EDT 2014