batgrbproduct Analysis for Trigger=512549
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): Sat Jan 28 03:52:38 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger512549/GCN5_download_cron
======================================================================
Trigger: 00512549 Segment: 000
BAT Trigger Time: 349346480 [s; MET]
Trigger Stop: 349347184 [s; MET]
UTC: 2012-01-27T08:41:12.173220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.97452692573 Dec: -37.8384975469438 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 25.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 25.45
Flight Position: [ source = BAT ]
RA: 255.97452692573 Dec: -37.8384975469438 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.98653278348 Dec: -37.847129607003 [deg; J2000]
{ 17h 03m 56.8s , -37d 50' 49.7" }
+/- 0.884987583135867 [arcmin] (estimated 90% radius based on SNR)
+/- 0.228719197683938 [arcmin] (formal 1-sigma fit error)
SNR: 36.2178288696357
Angular difference between Flight and Ground position is 0.769315 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 821.723999917507 +/- 24.6541339511172
Measured from: -44.2559998631477
to: 777.468000054359 [s; relative to TRIGTIME]
T50: 432.791999936104 +/- 20.7728996465895
Measured from: 134.008000135422
to: 566.800000071526 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -89.6060000061989
to: -88.6060000061989 [s; relative to TRIGTIME]
Total Fluence
Measured from: -89.5720000267029
to: 833.128000020981 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.348593 10.062254 3.128384 0.002530
0.214479 0.194469 0.160618 0.135266 [error]
Peak 0.048969 0.014841 0.007491 0.013134
0.017532 0.015580 0.013513 0.010814 [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 4.11e-06 3.88e-06 2.54e-06 2.58e-06 1.16e-05 1.31e-05 erg/cm2
Error 2.10e-07 1.19e-07 1.49e-07 3.07e-07 3.60e-07 4.78e-07 erg/cm2
Peak flux Power-law 4.65e-01 6.80e-02 4.52e-03 3.19e-04 5.37e-01 5.37e-01 ph/cm2/s
Error 3.58e-01 1.14e-01 3.32e-02 1.38e-02 4.51e-01 4.52e-01 ph/cm2/s
Fluence Cutoff-PL 3.73e-06 4.10e-06 2.33e-06 7.55e-07 1.09e-05 0.00e+00 erg/cm2
Error 2.56e-07 1.47e-07 1.90e-07 3.54e-07 6.25e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.64e-01 6.79e-02 4.51e-03 3.16e-04 5.37e-01 5.30e-01 ph/cm2/s
Error 3.58e-01 1.14e-01 3.31e-02 1.36e-02 4.50e-01 4.52e-01 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 0.00e+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 2.610 0.071 - - 1.22e-03 4.98e-05 73.400 57
CPL 1.813 0.273 9.4 0.0 3.49e-03 0.00e+00 54.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.913 -1.287 - - 3.78e-04 1.63e-03 48.060 57
CPL 1.000 0.000 50.0 0.0 9.23e-03 0.00e+00 53.980 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 922.700 -89.572 833.128
T90 821.724 -44.256 777.468
T50 432.792 134.008 566.800
Peak 1.000 -89.606 -88.606
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.9865 -37.8471 0.0053 1.9 95.8 22.2075 36.2 TRIG_00512549
------------------------------------------
Foreground time interval of the image:
-14.699 151.237 (delta_t = 165.937 [sec])
152.000 761.401 (delta_t = 609.401 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-89.572000 151.237200
152.000000 833.128000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.60959 ( -0.0701019 0.0711347 )
Norm@50keV : 1.21859E-03 ( -4.99477e-05 4.96759e-05 )
------------------------------------------------------------
# Chi-Squared = 73.40 using 59 PHA bins.
# Reduced chi-squared = 1.288 for 57 degrees of freedom
# Null hypothesis probability = 7.075077e-02
Photon flux (15-150 keV) in 921.9 sec: 0.256409 ( -0.00910939 0.0091741 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15982e-05 ( -3.59967e-07 3.60294e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-89.572000 151.237200
152.000000 833.128000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81323 ( -0.366105 0.179193 )
Epeak [keV] : 9.35787 ( )
Norm@50keV : 3.48959E-03 ( )
------------------------------------------------------------
# Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9647 for 56 degrees of freedom
# Null hypothesis probability = 5.500334e-01
Photon flux (15-150 keV) in 921.9 sec: 0.240920 ( -0.010736 0.010812 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09111e-05 ( -5.72316e-07 6.76951e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-89.572000 151.237200
152.000000 833.128000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.891895 ( -0.888321 3.27169 )
beta : -2.90734 ( -0.399715 0.180914 )
Epeak [keV] : 21.4928 ( -11.1809 3.50713 )
Norm@50keV : 1.49402E-02 ( -0.0161152 4.84339 )
------------------------------------------------------------
# Chi-Squared = 50.52 using 59 PHA bins.
# Reduced chi-squared = 0.9186 for 55 degrees of freedom
# Null hypothesis probability = 6.462259e-01
Photon flux (15-150 keV) in 921.9 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] : 8.25863 ( )
R^2/D10^2 : 0.210753 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 188.67 using 59 PHA bins.
# Reduced chi-squared = 3.3100 for 57 degrees of freedom
# Null hypothesis probability = 5.283270e-16
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.451e-06 1.540e-07
25- 50 4.530e-06 1.470e-07
50-150 1.319e-06 1.249e-07
15-150 8.301e-06 2.747e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.8931 (-2.33205 2.58105)
Norm : 1.78217 (-0.136698 0.149593)
------------------------------------------------------------
# Chi-Squared = 58.10 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 57 degrees of freedom
# Null hypothesis probability = 4.346307e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.495e-06 1.710e-07
25- 50 4.194e-06 1.318e-07
50-150 2.583e-06 2.360e-07
15-150 1.027e-05 3.227e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.37900 (-0.52609 0.527558)
R1^2/D10^2 : 1.02128 (-0.316283 0.531492)
kT2 [keV] : 15.2133 (-1.87265 2.47041)
R2^2/D10^2 : 9.62524E-03 (-0.00484074 0.00848128)
------------------------------------------------------------
# Chi-Squared = 51.02 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 55 degrees of freedom
# Null hypothesis probability = 6.275507e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.469e-06 3.333e-07
25- 50 4.094e-06 3.346e-07
50-150 2.872e-06 6.481e-07
15-150 1.043e-05 1.118e-06
Peak spectrum fit
Power-law model
Time interval is from -89.606 sec. to -88.606 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.91323 ( -2.33783 -4.91257 )
Norm@50keV : 3.78142E-04 ( -0.000378507 0.00288693 )
------------------------------------------------------------
# Chi-Squared = 48.06 using 59 PHA bins.
# Reduced chi-squared = 0.8431 for 57 degrees of freedom
# Null hypothesis probability = 7.946640e-01
Photon flux (15-150 keV) in 1 sec: 0.537359 ( -0.537359 0.364127 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73273e-08 ( -1.30985e-08 1.91951e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -89.606 sec. to -88.606 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.23200E-03 ( )
------------------------------------------------------------
# Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9640 for 56 degrees of freedom
# Null hypothesis probability = 5.516078e-01
Photon flux (15-150 keV) in 1 sec: 0.536917 ( -0.536917 0.363622 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73567e-08 ( -1.3139e-08 1.36222e-08 ) ergs/cm2
Band function
Time interval is from -89.606 sec. to -88.606 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.40300 ( 5.66995 5.66995 )
beta : -4.96892 ( 4.91773 2.34289 )
Epeak [keV] : 1.50671 ( -1.50671 -1.50671 )
Norm@50keV : 4.84576E-02 ( -0.0514467 0.393142 )
------------------------------------------------------------
# Chi-Squared = 48.06 using 59 PHA bins.
# Reduced chi-squared = 0.8737 for 55 degrees of freedom
# Null hypothesis probability = 7.349537e-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] : 2.61561 (-2.61128 3.13531)
R^2/D10^2 : 182.331 (-185.342 -185.342)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.63 using 59 PHA bins.
# Reduced chi-squared = 0.8532 for 57 degrees of freedom
# Null hypothesis probability = 7.770807e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.380e-08 8.200e-09
25- 50 1.214e-09 9.000e-10
50-150 5.913e-13 7.850e-13
15-150 1.502e-08 9.725e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.41368 (-5.40757 20.9222)
Norm : 91.5706 (-92.0356 7.2148e+07)
------------------------------------------------------------
# Chi-Squared = 48.39 using 59 PHA bins.
# Reduced chi-squared = 0.8490 for 57 degrees of freedom
# Null hypothesis probability = 7.844362e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.383e-08 8.340e-09
25- 50 2.082e-09 1.452e-09
50-150 1.588e-11 1.994e-11
15-150 1.593e-08 9.790e-09
Double BB
R1^2/D10^2 : 1.05513E+04 ( )
kT2 [keV] : 6.64536 (-6.74831 -6.74831)
R2^2/D10^2 : 0.738596 ( )
------------------------------------------------------------
# Chi-Squared = 47.99 using 59 PHA bins.
# Chi-Squared = 47.76 using 59 PHA bins.
# Chi-Squared = 47.73 using 59 PHA bins.
# Reduced chi-squared = 0.8726 for 55 degrees of freedom
# Reduced chi-squared = 0.8684 for 55 degrees of freedom
# Reduced chi-squared = 0.8679 for 55 degrees of freedom
# Null hypothesis probability = 7.371818e-01
# Null hypothesis probability = 7.450053e-01
# Null hypothesis probability = 7.459401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.322e-08 6.320e-09
25- 50 5.364e-09 5.515e-09
50-150 1.444e-09 1.394e-09
15-150 2.003e-08 1.130e-08
Plot creation:
Sat Jan 28 04:24:27 EST 2012