batgrbproduct Analysis for Trigger=341120
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.42
Process Start Time (local time): Mon Jan 26 10:27:29 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger341120/GCN5_download_cron
======================================================================
Trigger: 00341120 Segment: 000
BAT Trigger Time: 254621011.572 [s; MET]
Trigger Stop: 254621011.588 [s; MET]
UTC: 2009-01-26T00:03:27.125920 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 237.709025418487 Dec: -54.2998883055839 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.07
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 24.07
Flight Position: [ source = BAT ]
RA: 237.709025418487 Dec: -54.2998883055839 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 238.007028141999 Dec: -54.0854874894025 [deg; J2000]
{ 15h 52m 01.7s , -54d 05' 07.8" }
+/- 7.20444596842523 [arcmin] (estimated 90% radius based on SNR)
+/- 5.56895891815112 [arcmin] (formal 1-sigma fit error)
SNR: 1.81123450019184
Angular difference between Flight and Ground position is 16.580562 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 486 +/- 397.220971249001
Measured from: -102.571999907494
to: 383.428000092506 [s; relative to TRIGTIME]
T50: 347 +/- 783.502552644214
Measured from: -0.571999907493591
to: 346.428000092506 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.571999996900558
to: 0.428000003099442 [s; relative to TRIGTIME]
Total Fluence
Measured from: -205.571999996901
to: 744.428000003099 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.468719 0.372117 0.313798 0.183227
0.188054 0.164553 0.145350 0.136334 [error]
Peak 0.414464 0.381976 0.122811 0.002418
0.010372 0.009623 0.006608 0.004458 [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 9.63e-08 1.83e-07 2.68e-07 8.39e-07 7.58e-07 1.39e-06 erg/cm2
Error 6.21e-08 7.53e-08 1.32e-07 9.70e-07 3.28e-07 1.07e-06 erg/cm2
Peak flux Power-law 4.60e+00 2.57e+00 9.00e-01 4.13e-01 8.29e+00 8.48e+00 ph/cm2/s
Error 2.58e-01 9.35e-02 5.34e-02 4.65e-02 3.32e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 8.53e-08 2.07e-07 2.64e-07 1.70e-07 6.66e-07 7.20e-07 erg/cm2
Error 6.71e-08 1.02e-07 2.10e-07 9.90e-07 3.66e-07 1.14e-06 erg/cm2
Peak flux Cutoff-PL 3.62e+00 2.92e+00 8.72e-01 8.23e-02 7.48e+00 7.49e+00 ph/cm2/s
Error 3.18e-01 1.21e-01 6.61e-02 3.06e-02 3.64e-01 3.67e-01 ph/cm2/s
Fluence Band 7.89e-08 2.16e-07 2.52e-07 4.80e-07 7.01e-07 1.08e-06 erg/cm2
Error 6.99e-08 9.61e-08 1.49e-07 9.26e-07 3.07e-07 1.06e-06 erg/cm2
Peak flux Band 3.62e+00 2.92e+00 8.72e-01 9.72e-02 7.48e+00 7.49e+00 ph/cm2/s
Error 2.07e-01 1.07e-01 5.70e-02 4.16e-02 3.62e-01 3.35e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.449 0.692 - - 8.34e-05 3.31e-05 48.608 57
CPL 0.418 2.616 68.5 5000.0 3.07e-04 1.06e-02 48.112 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.512 0.071 - - 4.19e-02 1.89e-03 111.576 57
CPL 0.814 0.413 29.7 3.3 3.68e-01 2.07e-01 43.318 0
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: 282.944000 sec.
T50 in the 50-300 keV band: 203.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 950.000 -205.572 744.428
T90 486.000 -102.572 383.428
T50 347.000 -0.572 346.428
Peak 1.000 -0.572 0.428
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
238.0070 -54.0855 0.1067 0.3 -139.8 3.1522 1.8 TRIG_00341120
------------------------------------------
Foreground time interval of the image:
-205.572 146.010 (delta_t = 351.582 [sec])
147.428 744.428 (delta_t = 597.000 [sec])
Background time interval of the image:
-239.572 -205.572 (delta_t = 34.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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
-205.572000 146.009500
147.428000 744.428000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44873 ( -0.704617 0.679768 )
Norm@50keV : 8.344649E-05 ( -3.328350E-05 3.285275E-05) )
------------------------------------------------------------
Chi-Squared = 48.60752 using 59 PHA bins.
Reduced chi-squared = 0.8527635 for 57 degrees of freedom
Null hypothesis probability = 0.778
Photon flux (15-150 keV) in 948.6 sec: 1.028138E-02 ( -0.00405313 0.00409234 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.57822e-07 ( -3.19067e-07 3.36881e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-205.572000 146.009500
147.428000 744.428000
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.418379 ( -3.41838 1.81430 )
Epeak [keV] : 68.5081 ( -68.4981 9931.49 )
Norm@50keV : 3.071404E-04 ( -3.071404E-04 2.083592E-02) )
------------------------------------------------------------
Chi-Squared = 48.11213 using 59 PHA bins.
but latest trial 2.23268 gives Chi-Squared = 3.15713
Reduced chi-squared = 0.8591452 for 56 degrees of freedom
Null hypothesis probability = 0.764
Photon flux (15-150 keV) in 948.6 sec: 9.779342E-03 ( -0.00417748 0.00424547 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65709e-07 ( -3.37933e-07 3.93488e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-205.572000 146.009500
147.428000 744.428000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.598428 ( -9.40157 2.61528 )
beta : -8.61344 ( -8.07971 1.07244 )
Epeak [keV] : 74.1846 ( -55.3397 431.811 )
Norm@50keV : 2.443643E-04 ( -2.98920 1.42759 )
------------------------------------------------------------
Chi-Squared = 48.12915 using 59 PHA bins.
Reduced chi-squared = 0.8750755 for 55 degrees of freedom
Null hypothesis probability = 0.732
Photon flux (15-150 keV) in 948.6 sec: 9.763470E-03 ( -0.00409163 0.00427095 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.00729e-07 ( -3.33269e-07 2.80825e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.27502
R^2/D10^2 : 23.7048
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 127.8194 using 59 PHA bins.
Reduced chi-squared = 2.242445 for 57 degrees of freedom
Null hypothesis probability = 2.371E-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.575e-08 4.399e-09
25- 50 1.687e-07 5.891e-09
50-150 7.049e-08 5.562e-09
15-150 3.149e-07 1.087e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.7709 -1.9845 2.1306
Norm : 297.943 -19.435 20.705
------------------------------------------------------------
Chi-Squared = 49.72033 using 59 PHA bins.
Reduced chi-squared = 0.8722865 for 57 degrees of freedom
Null hypothesis probability = 0.742
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.220e-07 6.066e-09
25- 50 1.506e-07 5.099e-09
50-150 9.921e-08 7.559e-09
15-150 3.718e-07 1.184e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.55693 -0.76566 0.89097
R1^2/D10^2 : 247.126 -125.398 323.494
kT2 [keV] : 11.6608 -0.8061 1.0862
R2^2/D10^2 : 6.89816 -2.76333 3.27934
------------------------------------------------------------
Chi-Squared = 44.11040 using 59 PHA bins.
Reduced chi-squared = 0.8020074 for 55 degrees of freedom
Null hypothesis probability = 0.853
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.140e-07 1.966e-08
25- 50 1.527e-07 1.283e-08
50-150 9.168e-08 8.209e-09
15-150 3.583e-07 3.562e-08
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.572 sec. to 0.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.51207 ( -6.980085E-02 7.126617E-02) )
Norm@50keV : 4.190783E-02 ( -1.896564E-03 1.885492E-03) )
------------------------------------------------------------
Chi-Squared = 111.5764 using 59 PHA bins.
Reduced chi-squared = 1.957481 for 57 degrees of freedom
Null hypothesis probability = 2.112E-05
Photon flux (15-150 keV) in 1.000 sec: 8.29382 ( -0.33149 0.33287 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.2044e-07 ( -1.5603e-08 1.5619e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.572 sec. to 0.428 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.814475 ( -0.428750 0.396459 )
Epeak [keV] : 29.6931 ( -3.48894 3.09645 )
Norm@50keV : 0.367535 ( -0.145624 0.268758 )
------------------------------------------------------------
Chi-Squared = 43.31802 using 59 PHA bins.
but latest trial 24.9150 gives Chi-Squared = 21.6716
Reduced chi-squared = 0.7735360 for 56 degrees of freedom
Null hypothesis probability = 0.892
Photon flux (15-150 keV) in 1.000 sec: 7.47874 ( -0.36325 0.36562 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77454e-07 ( -1.6742e-08 1.7169e-08 ) ergs/cm2
Band function
Time interval is from -0.572 sec. to 0.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01117 ( -0.241086 0.436487 )
beta : -9.37139 ( -0.628610 5.79562 )
Epeak [keV] : 28.0955 ( -3.20896 1.58487 )
Norm@50keV : 0.285983 ( -0.138650 0.138650 )
------------------------------------------------------------
Chi-Squared = 43.96646 using 59 PHA bins.
Reduced chi-squared = 0.7993901 for 55 degrees of freedom
Null hypothesis probability = 0.857
Photon flux (15-150 keV) in 1.000 sec: 7.48198 ( -0.36222 0.36156 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78474e-07 ( -1.9092e-08 1.6623e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.27095
R^2/D10^2 : 23.2868
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 128.6699 using 59 PHA bins.
Reduced chi-squared = 2.257366 for 57 degrees of freedom
Null hypothesis probability = 1.852E-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.592e-08 4.457e-09
25- 50 1.689e-07 6.317e-09
50-150 7.051e-08 5.804e-09
15-150 3.153e-07 1.083e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.8301 -1.9985 2.1363
Norm : 291.666 -19.005 20.348
------------------------------------------------------------
Chi-Squared = 50.43739 using 59 PHA bins.
Reduced chi-squared = 0.8848665 for 57 degrees of freedom
Null hypothesis probability = 0.718
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.221e-07 6.464e-09
25- 50 1.508e-07 5.017e-09
50-150 9.954e-08 7.024e-09
15-150 3.724e-07 1.209e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.56707 -0.76806 0.90137
R1^2/D10^2 : 239.929 -122.099 313.373
kT2 [keV] : 11.6693 -0.811 1.1061
R2^2/D10^2 : 6.73538 -2.73392 3.22348
------------------------------------------------------------
Chi-Squared = 45.31697 using 59 PHA bins.
Reduced chi-squared = 0.8239449 for 55 degrees of freedom
Null hypothesis probability = 0.821
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.140e-07 2.225e-08
25- 50 1.529e-07 1.496e-08
50-150 9.184e-08 1.029e-08
15-150 3.588e-07 3.325e-08
Plot creation:
Mon Jan 26 11:00:45 EST 2009