batgrbproduct Analysis for Trigger=598284
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 May 7 11:08:26 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger598284/GCN5_download_cron
======================================================================
Trigger: 00598284 Segment: 000
BAT Trigger Time: 421103268.8 [s; MET]
Trigger Stop: 421103269.824 [s; MET]
UTC: 2014-05-06T21:07:36.822400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 276.789901704877 Dec: -55.5621609300121 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.41
Image Trigger?: NO
Rate S/N Ratio: 41.4487635521254 [ if not an image trigger ]
Image S/N Ratio: 12.41
Flight Position: [ source = BAT ]
RA: 276.789901704877 Dec: -55.5621609300121 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 276.806886282272 Dec: -55.5556086576067 [deg; J2000]
{ 18h 27m 13.7s , -55d 33' 20.2" }
+/- 1.59745804819567 [arcmin] (estimated 90% radius based on SNR)
+/- 0.614315285836002 [arcmin] (formal 1-sigma fit error)
SNR: 15.5777547879453
Angular difference between Flight and Ground position is 0.697662 arcmin
Partial Coding Fraction: 0.1162109 [ including projection effects ]
Duration
T90: 111.099999964237 +/- 9.55670993835752
Measured from: 0.100000083446503
to: 111.200000047684 [s; relative to TRIGTIME]
T50: 60.3959999680519 +/- 6.52270984791344
Measured from: 0.788000106811523
to: 61.1840000748634 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.00400000810623169
to: 1.00400000810623 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.196000039577484
to: 120.175999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.096104 1.464419 1.218854 0.313766
0.134684 0.129073 0.108593 0.090706 [error]
Peak 0.261690 0.398934 0.444044 0.160206
0.027743 0.032692 0.031642 0.022692 [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 4.54e-07 7.49e-07 9.37e-07 2.33e-06 2.79e-06 4.47e-06 erg/cm2
Error 7.49e-08 7.41e-08 1.09e-07 5.92e-07 2.66e-07 6.66e-07 erg/cm2
Peak flux Power-law 3.25e+00 3.56e+00 2.77e+00 3.56e+00 1.09e+01 1.31e+01 ph/cm2/s
Error 4.66e-01 3.24e-01 2.45e-01 6.26e-01 9.07e-01 1.04e+00 ph/cm2/s
Fluence Cutoff-PL 4.42e-07 7.58e-07 9.50e-07 1.95e-06 2.78e-06 4.10e-06 erg/cm2
Error 8.90e-08 8.28e-08 1.21e-07 1.01e-06 2.79e-07 1.05e-06 erg/cm2
Peak flux Cutoff-PL 2.66e+00 3.77e+00 3.10e+00 1.86e+00 1.06e+01 1.14e+01 ph/cm2/s
Error 5.84e-01 3.73e-01 3.30e-01 8.21e-01 9.25e-01 1.24e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.14e+01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.676 0.163 - - 2.50e-03 2.30e-04 46.580 57
CPL 1.545 0.480 186.2 0.0 2.89e-03 2.44e-03 46.450 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.358 0.125 - - 9.04e-02 7.10e-03 61.810 57
CPL 0.529 0.603 100.4 55.0 2.17e-01 1.48e-01 55.120 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: 59.136000 sec.
T50 in the 50-300 keV band: 30.464000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 120.372 -0.196 120.176
T90 111.100 0.100 111.200
T50 60.396 0.788 61.184
Peak 1.000 0.004 1.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
276.8069 -55.5556 0.0123 51.1 14.2 2.5167 15.6 TRIG_00598284
------------------------------------------
Foreground time interval of the image:
-0.196 14.201 (delta_t = 14.397 [sec])
Background time interval of the image:
-239.800 -0.196 (delta_t = 239.604 [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 -0.196 sec. to 120.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67628 ( -0.16236 0.164062 )
Norm@50keV : 2.50117E-03 ( -0.000230093 0.000229508 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.58 using 59 PHA bins.
# Reduced chi-squared = 0.8172 for 57 degrees of freedom
# Null hypothesis probability = 8.362188e-01
Photon flux (15-150 keV) in 120.4 sec: 0.329478 ( -0.0326264 0.0328211 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79376e-06 ( -2.65685e-07 2.66782e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.196 sec. to 120.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54538 ( -0.669368 0.290075 )
Epeak [keV] : 186.182 ( -186.14 -186.14 )
Norm@50keV : 2.88850E-03 ( -0.00188707 0.00299747 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8294 for 56 degrees of freedom
# Null hypothesis probability = 8.148136e-01
Photon flux (15-150 keV) in 120.4 sec: 0.326919 ( -0.034589 0.03444 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77711e-06 ( -2.80147e-07 2.76884e-07 ) ergs/cm2
Band function
Time interval is from -0.196 sec. to 120.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53937 ( -0.156171 0.395599 )
beta : -9.37102 ( 9.37165 19.3716 )
Epeak [keV] : 180.898 ( -101.188 -181.046 )
Norm@50keV : 2.90655E-03 ( -0.000263337 0.000351658 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.45 using 59 PHA bins.
# Reduced chi-squared = 0.8445 for 55 degrees of freedom
# Null hypothesis probability = 7.874260e-01
Photon flux (15-150 keV) in 120.4 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] : 15.6109 (-1.72734 1.96721)
R^2/D10^2 : 3.03504E-02 (-0.0106766 0.0162949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.32 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.697562e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.851e-07 3.486e-08
25- 50 7.624e-07 1.032e-07
50-150 1.286e-06 2.245e-07
15-150 2.234e-06 2.787e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 160.897 (-53.0533 -160.808)
Norm : 1.33789 (-0.143563 0.171297)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.98 using 59 PHA bins.
# Reduced chi-squared = 0.8243 for 57 degrees of freedom
# Null hypothesis probability = 8.253388e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.111e-07 5.544e-08
25- 50 7.696e-07 1.834e-07
50-150 1.563e-06 8.292e-07
15-150 2.743e-06 8.833e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.41448 (-1.58925 2.17523)
R1^2/D10^2 : 0.950016 (-0.685259 2.32218)
kT2 [keV] : 22.4630 (-3.94837 7.00528)
R2^2/D10^2 : 6.89838E-03 (-0.00443105 0.00540311)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.07 using 59 PHA bins.
# Reduced chi-squared = 0.8559 for 55 degrees of freedom
# Null hypothesis probability = 7.676502e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.554e-07 2.272e-07
25- 50 7.106e-07 2.512e-07
50-150 1.568e-06 4.439e-07
15-150 2.734e-06 7.730e-07
Peak spectrum fit
Power-law model
Time interval is from 0.004 sec. to 1.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35834 ( -0.124873 0.1248 )
Norm@50keV : 9.04234E-02 ( -0.00710123 0.0071011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.81 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 57 degrees of freedom
# Null hypothesis probability = 3.083491e-01
Photon flux (15-150 keV) in 1 sec: 10.9123 ( -0.905554 0.907637 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81509e-07 ( -7.29558e-08 7.3067e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.004 sec. to 1.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.529125 ( -0.645918 0.560979 )
Epeak [keV] : 100.353 ( -21.8736 88.1098 )
Norm@50keV : 0.216991 ( -0.0952718 0.200975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 0.9843 for 56 degrees of freedom
# Null hypothesis probability = 5.081037e-01
Photon flux (15-150 keV) in 1 sec: 10.6370 ( -0.92364 0.927 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.67105e-07 ( -7.5539e-08 7.5221e-08 ) ergs/cm2
Band function
Time interval is from 0.004 sec. to 1.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.533543 ( -0.483009 0.424002 )
beta : -9.36654 ( 9.37088 19.3709 )
Epeak [keV] : 100.768 ( -16.2169 67.0792 )
Norm@50keV : 0.215655 ( -0.0939443 0.0600703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.700098e-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] : 18.0895 (-1.50361 1.68255)
R^2/D10^2 : 0.714953 (-0.192087 0.252934)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.87 using 59 PHA bins.
# Reduced chi-squared = 1.296 for 57 degrees of freedom
# Null hypothesis probability = 6.582247e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.677e-08 7.320e-09
25- 50 2.171e-07 2.430e-08
50-150 5.163e-07 6.845e-08
15-150 7.802e-07 7.290e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 46.1108 (-3.64051 3.64005)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.30 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 57 degrees of freedom
# Null hypothesis probability = 1.868193e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.148e-07 1.065e-08
25- 50 2.209e-07 2.530e-08
50-150 4.845e-07 1.849e-07
15-150 8.203e-07 1.708e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.09874 (-1.83295 7.81152)
R1^2/D10^2 : 23.1109 (-21.1048 81.5911)
kT2 [keV] : 21.6499 (-2.7577 21.8894)
R2^2/D10^2 : 0.347297 (-0.325344 0.249675)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.72 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 55 degrees of freedom
# Null hypothesis probability = 4.105735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.109e-08 3.836e-08
25- 50 2.006e-07 4.865e-08
50-150 5.581e-07 1.062e-07
15-150 8.498e-07 1.548e-07
Plot creation:
Wed May 7 11:11:52 EDT 2014