batgrbproduct Analysis for Trigger=519256
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 Apr 4 00:06:07 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger519256/GCN5_download_hand
======================================================================
Trigger: 00519256 Segment: 000
BAT Trigger Time: 355178044.544 [s; MET]
Trigger Stop: 355178046.592 [s; MET]
UTC: 2012-04-03T20:33:56.481060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 54.8088242661129 Dec: -89.0369268415211 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 13 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 54.8088242661129 Dec: -89.0369268415211 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 54.3024886612808 Dec: -89.0291830059353 [deg; J2000]
{ 03h 37m 12.6s , -89d 01' 45.1" }
+/- 2.44083490949671 [arcmin] (estimated 90% radius based on SNR)
+/- 1.33424642683046 [arcmin] (formal 1-sigma fit error)
SNR: 8.50143200371623
Angular difference between Flight and Ground position is 0.691895 arcmin
Partial Coding Fraction: 0.4765625 [ including projection effects ]
Duration
T90: 7.28399991989136 +/- 1.919334249261
Measured from: -2.59999990463257
to: 4.68400001525879 [s; relative to TRIGTIME]
T50: 2.72399997711182 +/- 2.17025436146543
Measured from: -0.635999917984009
to: 2.08800005912781 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.915999948978424
to: 1.91599994897842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.96000003814697
to: 5.32799994945526 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.142084 0.114402 0.104753 -0.030192
0.022381 0.022587 0.019270 0.016285 [error]
Peak 0.029840 0.032618 0.045795 0.002910
0.008140 0.008556 0.007579 0.005806 [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-08 5.82e-08 6.76e-08 1.51e-07 2.08e-07 3.14e-07 erg/cm2
Error 9.79e-09 1.04e-08 1.85e-08 8.36e-08 4.38e-08 1.02e-07 erg/cm2
Peak flux Power-law 2.70e-01 3.06e-01 2.48e-01 3.36e-01 9.47e-01 1.16e+00 ph/cm2/s
Error 1.01e-01 7.25e-02 5.94e-02 1.65e-01 2.03e-01 2.47e-01 ph/cm2/s
Fluence Cutoff-PL 3.58e-08 6.20e-08 6.84e-08 7.04e-08 2.37e-07 0.00e+00 erg/cm2
Error 1.08e-08 1.30e-08 2.03e-08 1.16e-07 1.24e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.25e-01 3.22e-01 2.72e-01 9.20e-01 9.93e-01 0.00e+00 ph/cm2/s
Error 1.26e-01 8.33e-02 7.51e-02 2.10e-01 3.08e-01 0.00e+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 1.07e+00 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 1.785 0.314 - - 2.72e-03 5.59e-04 47.160 57
CPL 1.304 1.018 65.6 -7.6 5.02e-03 1.05e-02 46.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.302 0.345 - - 7.93e-03 1.64e-03 53.370 57
CPL 0.526 1.444 105.7 0.0 1.81e-02 0.00e+00 52.430 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 8.288 -2.960 5.328
T90 7.284 -2.600 4.684
T50 2.724 -0.636 2.088
Peak 1.000 0.916 1.916
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
54.3025 -89.0292 0.0227 30.6 -115.9 0.3581 8.5 TRIG_00519256
------------------------------------------
Foreground time interval of the image:
-2.960 5.328 (delta_t = 8.288 [sec])
Background time interval of the image:
-239.544 -2.960 (delta_t = 236.584 [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 -2.960 sec. to 5.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78545 ( -0.304397 0.323168 )
Norm@50keV : 2.72368E-03 ( -0.000566886 0.000550328 )
------------------------------------------------------------
# Chi-Squared = 47.16 using 59 PHA bins.
# Reduced chi-squared = 0.8273 for 57 degrees of freedom
# Null hypothesis probability = 8.205372e-01
Photon flux (15-150 keV) in 8.288 sec: 0.373220 ( -0.0667689 0.0667982 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.07933e-07 ( -4.3264e-08 4.44148e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.960 sec. to 5.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30365 ( -1.21337 0.821699 )
Epeak [keV] : 65.6318 ( -50.2784 -65.5449 )
Norm@50keV : 5.01689E-03 ( -0.00303739 0.0179103 )
------------------------------------------------------------
# Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8298 for 56 degrees of freedom
# Null hypothesis probability = 8.142222e-01
Photon flux (15-150 keV) in 8.288 sec: 0.367906 ( -0.067482 0.067574 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.36564e-07 ( -7.54838e-08 1.71854e-07 ) ergs/cm2
Band function
Time interval is from -2.960 sec. to 5.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.31890 ( 1.30403 1.18172 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 67.3210 ( -37.2911 -67.3187 )
Norm@50keV : 4.88904E-03 ( -0.00206617 0.0179654 )
------------------------------------------------------------
# Chi-Squared = 46.47 using 59 PHA bins.
# Reduced chi-squared = 0.8449 for 55 degrees of freedom
# Null hypothesis probability = 7.867160e-01
Photon flux (15-150 keV) in 8.288 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] : 12.0588 (-3.13437 4.0196)
R^2/D10^2 : 8.74494E-02 (-0.0557984 0.1761)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.849132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.230e-08 8.599e-09
25- 50 7.058e-08 2.248e-08
50-150 6.192e-08 2.687e-08
15-150 1.548e-07 4.629e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 103.123 (-44.1602 -100.045)
Norm : 1.64727 (-0.357579 0.489135)
------------------------------------------------------------
# Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8154 for 57 degrees of freedom
# Null hypothesis probability = 8.389306e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.568e-08 8.288e-09
25- 50 6.208e-08 1.310e-08
50-150 1.023e-07 2.358e-08
15-150 2.001e-07 4.252e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.29746 (-1.55245 2.15528)
R1^2/D10^2 : 1.32620 (-0.976821 4.23564)
kT2 [keV] : 21.4396 (-5.93526 11.2697)
R2^2/D10^2 : 8.54384E-03 (-0.00665427 0.0207169)
------------------------------------------------------------
# Chi-Squared = 43.61 using 59 PHA bins.
# Reduced chi-squared = 0.7929 for 55 degrees of freedom
# Null hypothesis probability = 8.657637e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.959e-08 2.217e-08
25- 50 5.689e-08 2.991e-08
50-150 1.102e-07 6.709e-08
15-150 2.067e-07 1.113e-07
Peak spectrum fit
Power-law model
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30183 ( -0.347415 0.343361 )
Norm@50keV : 7.93261E-03 ( -0.00164539 0.00164408 )
------------------------------------------------------------
# Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 57 degrees of freedom
# Null hypothesis probability = 6.121055e-01
Photon flux (15-150 keV) in 1 sec: 0.946701 ( -0.202669 0.203489 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.83541e-08 ( -1.75534e-08 1.77281e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.526352 ( -1.91667 0.971992 )
Epeak [keV] : 105.659 ( )
Norm@50keV : 1.81147E-02 ( )
------------------------------------------------------------
# Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9362 for 56 degrees of freedom
# Null hypothesis probability = 6.108406e-01
Photon flux (15-150 keV) in 1 sec: 0.920476 ( -0.210928 0.209414 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.916 sec. to 1.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.526517 ( 0.716921 2.15938 )
beta : -10.00000 ( 6.77638e+10 6.77638e+10 )
Epeak [keV] : 105.646 ( -42.3508 -105.648 )
Norm@50keV : 1.81126E-02 ( -0.0113017 0.0976598 )
------------------------------------------------------------
# Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9533 for 55 degrees of freedom
# Null hypothesis probability = 5.734659e-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] : 18.9830 (-4.00916 5.42398)
R^2/D10^2 : 5.24551E-02 (-0.0301802 0.0644245)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.08 using 59 PHA bins.
# Reduced chi-squared = 0.9664 for 57 degrees of freedom
# Null hypothesis probability = 5.473311e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.717e-09 1.862e-09
25- 50 1.787e-08 7.040e-09
50-150 4.730e-08 1.986e-08
15-150 6.889e-08 2.400e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 3.96020 (-3.9602 -3.9602)
------------------------------------------------------------
# Chi-Squared = 54.47 using 59 PHA bins.
# Reduced chi-squared = 0.9556 for 57 degrees of freedom
# Null hypothesis probability = 5.706559e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.858e-09 5.610e-09
25- 50 1.896e-08 1.067e-08
50-150 4.159e-08 2.383e-08
15-150 7.041e-08 4.028e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.75526 (-2.16907 4.23119)
R1^2/D10^2 : 2.88405 (-2.80779 18.4467)
kT2 [keV] : 22.5438 (-5.64686 14.3525)
R2^2/D10^2 : 2.68342E-02 (-0.0229718 0.04749)
------------------------------------------------------------
# Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.9320 for 55 degrees of freedom
# Null hypothesis probability = 6.183480e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.208e-09 4.590e-09
25- 50 1.667e-08 8.715e-09
50-150 5.094e-08 3.097e-08
15-150 7.582e-08 4.165e-08
Plot creation:
Wed Apr 4 08:29:48 EDT 2012