batgrbproduct Analysis for Trigger=414875
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 v2.45
Process Start Time (local time): Fri Mar 5 13:03:43 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger414875/GCN5_download_cron
======================================================================
Trigger: 00414875 Segment: 000
BAT Trigger Time: 289437240 [s; MET]
Trigger Stop: 289437560 [s; MET]
UTC: 2010-03-04T23:13:54.415660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.614329912843 Dec: -26.3367227308716 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.45
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.45
Flight Position: [ source = BAT ]
RA: 268.614329912843 Dec: -26.3367227308716 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.62748625746 Dec: -26.3381673053183 [deg; J2000]
{ 17h 54m 30.6s , -26d 20' 17.4" }
+/- 3.07039548259205 [arcmin] (estimated 90% radius based on SNR)
+/- 1.83579445659156 [arcmin] (formal 1-sigma fit error)
SNR: 6.12528776395708
Angular difference between Flight and Ground position is 0.712730 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.035099 0.401530 0.149379 0.203099
0.108324 0.103756 0.095494 0.101739 [error]
Peak 1.035099 0.401530 0.149379 0.203099
0.108324 0.103756 0.095494 0.101739 [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 3.06e-07 2.04e-07 8.87e-08 5.30e-08 6.25e-07 6.52e-07 erg/cm2
Error 5.70e-08 5.93e-08 5.66e-08 6.42e-08 1.49e-07 1.80e-07 erg/cm2
Peak flux Power-law 3.17e-02 1.21e-02 2.70e-03 7.19e-04 4.70e-02 4.73e-02 ph/cm2/s
Error 5.06e-03 3.25e-03 1.56e-03 8.58e-04 7.64e-03 7.79e-03 ph/cm2/s
Fluence Cutoff-PL 3.06e-07 2.04e-07 8.85e-08 5.25e-08 6.25e-07 6.51e-07 erg/cm2
Error 5.70e-08 5.94e-08 5.66e-08 6.35e-08 1.49e-07 1.80e-07 erg/cm2
Peak flux Cutoff-PL 3.17e-02 1.21e-02 2.69e-03 7.13e-04 4.70e-02 4.73e-02 ph/cm2/s
Error 5.06e-03 3.25e-03 1.56e-03 8.51e-04 7.63e-03 7.79e-03 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 3.202 0.555 - - 1.47e-04 7.02e-05 70.080 57
CPL 1.000 0.000 50.0 0.0 8.55e-04 0.00e+00 98.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.173 0.498 - - 1.50e-04 6.82e-05 70.830 57
CPL 1.000 0.000 50.0 0.0 9.29e-04 0.00e+00 108.200 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.6275 -26.3382 0.0313 24.6 -161.2 1.8638 6.1 TRIG_00414875
------------------------------------------
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [sec])
Background time interval of the image:
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
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.20232 ( -0.50598 0.604348 )
Norm@50keV : 1.47118E-04 ( -6.43391e-05 7.6007e-05 )
------------------------------------------------------------
# Chi-Squared = 70.08 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.143308e-01
Photon flux (15-150 keV) in 320 sec: 4.70508E-02 ( -0.00814731 0.00817854 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25053e-07 ( -1.40387e-07 1.57564e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 8.54540E-04 ( )
------------------------------------------------------------
# Chi-Squared = 98.96 using 59 PHA bins.
# Reduced chi-squared = 1.767 for 56 degrees of freedom
# Null hypothesis probability = 3.522297e-04
Photon flux (15-150 keV) in 320 sec: 4.70264E-02 ( -0.008144 0.0081752 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24874e-07 ( -1.4033e-07 1.57472e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55789 ( 1.5579 1.5579 )
beta : -3.46679 ( 3.47145 0.738306 )
Epeak [keV] : 6.09362 ( -6.08437 12.7932 )
Norm@50keV : 2.96533E-03 ( -0.00298295 16.6824 )
------------------------------------------------------------
# Chi-Squared = 69.70 using 59 PHA bins.
# Reduced chi-squared = 1.267 for 55 degrees of freedom
# Null hypothesis probability = 8.762281e-02
Photon flux (15-150 keV) in 320 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.17261 ( -0.453232 0.543484 )
Norm@50keV : 1.50374E-04 ( -6.26422e-05 7.37378e-05 )
------------------------------------------------------------
# Chi-Squared = 70.83 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.030647e-01
Photon flux (15-150 keV) in 320 sec: 4.70249E-02 ( -0.00761408 0.00766057 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29411e-07 ( -1.39164e-07 1.56854e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.29292E-04 ( )
------------------------------------------------------------
# Chi-Squared = 108.20 using 59 PHA bins.
# Reduced chi-squared = 1.9321 for 56 degrees of freedom
# Null hypothesis probability = 3.554630e-05
Photon flux (15-150 keV) in 320 sec: 4.70009E-02 ( -0.0076115 0.0076579 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.29226e-07 ( -1.39104e-07 1.56762e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.400072 ( 1.70554 1.70554 )
beta : -3.54085 ( 3.47161 11.6132 )
Epeak [keV] : 12.8471 ( -12.8156 6.83391 )
Norm@50keV : 2.47786E-02 ( -0.0252596 710.594 )
------------------------------------------------------------
# Chi-Squared = 70.29 using 59 PHA bins.
# Reduced chi-squared = 1.278 for 55 degrees of freedom
# Null hypothesis probability = 8.024766e-02
Photon flux (15-150 keV) in 320 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Mar 5 13:22:11 EST 2010