batgrbproduct Analysis for Trigger=504101
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): Tue Sep 27 08:10:22 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger504101/GCN5_download_cron
======================================================================
Trigger: 00504101 Segment: 000
BAT Trigger Time: 338760696 [s; MET]
Trigger Stop: 338760760 [s; MET]
UTC: 2011-09-26T20:11:28.594000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.160930132236 Dec: -37.6492068706881 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.08
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 16.08
Flight Position: [ source = BAT ]
RA: 258.160930132236 Dec: -37.6492068706881 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.148414737648 Dec: -37.640193134663 [deg; J2000]
{ 17h 12m 35.6s , -37d 38' 24.7" }
+/- 1.39171753073932 [arcmin] (estimated 90% radius based on SNR)
+/- 0.413359159496046 [arcmin] (formal 1-sigma fit error)
SNR: 18.9690413418876
Angular difference between Flight and Ground position is 0.803760 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 188.535999953747 +/- 19.2663110410004
Measured from: -46.6999998688698
to: 141.836000084877 [s; relative to TRIGTIME]
T50: 94.6399999260902 +/- 8.21658443366115
Measured from: 16.1000001430511
to: 110.740000069141 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 117.592000007629
to: 118.592000007629 [s; relative to TRIGTIME]
Total Fluence
Measured from: -72.5320000052452
to: 174.375999987125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.885673 0.507081 0.059320 0.145698
0.099219 0.087645 0.074326 0.066151 [error]
Peak 0.041124 0.005659 0.008003 0.008957
0.006589 0.005515 0.004777 0.004264 [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 1.47e-06 2.19e-07 1.49e-08 1.07e-09 1.71e-06 1.71e-06 erg/cm2
Error 1.40e-07 3.85e-08 6.40e-09 7.97e-10 1.44e-07 1.44e-07 erg/cm2
Peak flux Power-law 4.20e-01 7.79e-02 6.99e-03 6.81e-04 5.05e-01 5.06e-01 ph/cm2/s
Error 1.05e-01 5.46e-02 1.34e-02 3.14e-03 1.36e-01 1.37e-01 ph/cm2/s
Fluence Cutoff-PL 1.49e-06 1.34e-07 5.92e-11 1.54e-18 1.63e-06 1.63e-06 erg/cm2
Error 1.54e-07 4.51e-08 5.70e-10 4.66e-14 1.57e-07 1.57e-07 erg/cm2
Peak flux Cutoff-PL 4.20e-01 7.75e-02 6.91e-03 6.66e-04 5.05e-01 5.05e-01 ph/cm2/s
Error 1.05e-01 5.63e-02 1.34e-02 3.06e-03 1.36e-01 1.36e-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 5.881 0.374 - - 6.31e-05 2.21e-05 67.440 57
CPL -0.710 0.000 8.6 0.0 1.70e+01 0.00e+00 57.220 56
The chi2 of BB fit is 56.95 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.477 1.363 - - 5.34e-04 7.83e-04 68.520 57
CPL 1.844 0.000 1.1 0.0 9.54e-02 0.00e+00 69.200 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 246.908 -72.532 174.376
T90 188.536 -46.700 141.836
T50 94.640 16.100 110.740
Peak 1.000 117.592 118.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.1484 -37.6402 0.0102 8.4 -48.1 2.2019 19.0 TRIG_00504101
------------------------------------------
Foreground time interval of the image:
-18.499 51.980 (delta_t = 70.479 [sec])
53.000 72.801 (delta_t = 19.801 [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
-72.532000 -55.879600
-55.000000 51.980000
53.000000 174.376000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.88084 ( -0.369892 0.378295 )
Norm@50keV : 6.30745E-05 ( -1.90802e-05 2.50823e-05 )
------------------------------------------------------------
# Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.621864e-01
Photon flux (15-150 keV) in 245 sec: 0.230362 ( -0.0207723 0.0208596 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70546e-06 ( -1.43851e-07 1.44203e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-72.532000 -55.879600
-55.000000 51.980000
53.000000 174.376000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.710108 ( )
Epeak [keV] : 8.56344 ( )
Norm@50keV : 16.9608 ( )
------------------------------------------------------------
# Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.294918e-01
Photon flux (15-150 keV) in 245 sec: 0.223824 ( -0.023529 0.023004 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62863e-06 ( -1.5837e-07 1.55205e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-72.532000 -55.879600
-55.000000 51.980000
53.000000 174.376000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.08364 ( 0.40871 7.79437 )
beta : -5.88086 ( -0.97535 -0.226664 )
Epeak [keV] : 369.075 ( -369.075 -369.075 )
Norm@50keV : 8.57218E-03 ( -0.00259272 0.0034096 )
------------------------------------------------------------
# Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.210904e-01
Photon flux (15-150 keV) in 245 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] : 2.64173 (-0.173507 0.193037)
R^2/D10^2 : 75.2910 (-31.8396 54.5039)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.95 using 59 PHA bins.
# Reduced chi-squared = 0.9992 for 57 degrees of freedom
# Null hypothesis probability = 4.768533e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.496e-06 2.501e-07
25- 50 1.368e-07 2.923e-08
50-150 7.308e-11 4.807e-11
15-150 1.633e-06 2.791e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.67730 (-0.454156 0.533817)
Norm : 67.6710 (-24.7189 39.2598)
------------------------------------------------------------
# Chi-Squared = 58.63 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.155884e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.503e-06 2.092e-07
25- 50 1.627e-07 3.736e-08
50-150 5.957e-10 3.788e-10
15-150 1.666e-06 2.522e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.63119 (-0.175054 0.191533)
R1^2/D10^2 : 77.4148 (-30.1777 57.1593)
kT2 [keV] : 165.716 (-101.623 -101.623)
R2^2/D10^2 : 4.03525E-06 (-3.69247e-06 0.0025774)
------------------------------------------------------------
# Chi-Squared = 53.50 using 59 PHA bins.
# Reduced chi-squared = 0.9728 for 55 degrees of freedom
# Null hypothesis probability = 5.320112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.498e-06 2.788e-07
25- 50 1.434e-07 3.379e-08
50-150 2.042e-07 1.796e-07
15-150 1.845e-06 3.810e-07
Peak spectrum fit
Power-law model
Time interval is from 117.592 sec. to 118.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.47706 ( -1.15765 1.5674 )
Norm@50keV : 5.34441E-04 ( -0.00053438 0.00103195 )
------------------------------------------------------------
# Chi-Squared = 68.52 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 57 degrees of freedom
# Null hypothesis probability = 1.411959e-01
Photon flux (15-150 keV) in 1 sec: 0.505353 ( -0.136094 0.136446 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6995e-08 ( -5.52271e-09 6.62238e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 117.592 sec. to 118.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84413 ( )
Epeak [keV] : 1.14770 ( )
Norm@50keV : 9.53922E-02 ( )
------------------------------------------------------------
# Chi-Squared = 69.20 using 59 PHA bins.
# Reduced chi-squared = 1.236 for 56 degrees of freedom
# Null hypothesis probability = 1.106610e-01
Photon flux (15-150 keV) in 1 sec: 0.504532 ( -0.135545 0.136701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70036e-08 ( -5.5383e-09 6.5451e-09 ) ergs/cm2
Band function
Time interval is from 117.592 sec. to 118.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.76567 ( 21.9999 21.9999 )
beta : -4.47714 ( -1.56743 1.15882 )
Epeak [keV] : 2.04971 ( -2.04971 -2.04971 )
Norm@50keV : 7.26324E-02 ( -0.0726285 0.140258 )
------------------------------------------------------------
# Chi-Squared = 68.52 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.041048e-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] : 2.96506 (-0.7733 1.01226)
R^2/D10^2 : 74.4684 (-74.5141 505.422)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 69.81 using 59 PHA bins.
# Reduced chi-squared = 1.225 for 57 degrees of freedom
# Null hypothesis probability = 1.187352e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.294e-08 7.575e-09
25- 50 1.810e-09 1.227e-09
50-150 2.650e-12 3.086e-12
15-150 1.475e-08 8.705e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.32145 (-2.46146 4.73161)
Norm : 52.6629 (-52.6669 227.264)
------------------------------------------------------------
# Chi-Squared = 69.28 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.275436e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.269e-08 7.165e-09
25- 50 2.611e-09 1.713e-09
50-150 3.905e-11 4.459e-11
15-150 1.534e-08 8.870e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.87417 (-0.746059 0.76805)
R1^2/D10^2 : 89.1579 (-73.0383 644.087)
kT2 [keV] : 197.968 (-116.558 -116.559)
R2^2/D10^2 : 7.11238E-05 (-4.44595e-05 0.00471434)
------------------------------------------------------------
# Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 55 degrees of freedom
# Null hypothesis probability = 2.277934e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.280e-08 7.290e-09
25- 50 2.359e-09 1.059e-09
50-150 1.866e-08 3.246e-09
15-150 3.382e-08 8.830e-09
Plot creation:
Tue Sep 27 08:32:41 EDT 2011