batgrbproduct Analysis for Trigger=416226
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): Thu Mar 18 14:34:48 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger416226/GCN5_download_cron
======================================================================
Trigger: 00416226 Segment: 000
BAT Trigger Time: 290493840 [s; MET]
Trigger Stop: 290493904 [s; MET]
UTC: 2010-03-17T04:43:54.378900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 175.0587011447 Dec: -46.3142975362412 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 175.0587011447 Dec: -46.3142975362412 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 175.069761393636 Dec: -46.2948201023902 [deg; J2000]
{ 11h 40m 16.7s , -46d 17' 41.4" }
+/- 3.51920567691983 [arcmin] (estimated 90% radius based on SNR)
+/- 1.80534487171695 [arcmin] (formal 1-sigma fit error)
SNR: 5.04061080865096
Angular difference between Flight and Ground position is 1.255349 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.140835 0.178831 -0.004029 0.000463
0.039318 0.038958 0.033509 0.029701 [error]
Peak 0.140835 0.178831 -0.004029 0.000463
0.039318 0.038958 0.033509 0.029701 [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 4.37e-08 4.73e-08 3.64e-08 4.59e-08 1.45e-07 1.74e-07 erg/cm2
Error 1.53e-08 1.71e-08 2.37e-08 5.80e-08 5.91e-08 9.50e-08 erg/cm2
Peak flux Power-law 2.26e-02 1.36e-02 5.22e-03 2.68e-03 4.28e-02 4.41e-02 ph/cm2/s
Error 7.82e-03 4.72e-03 3.10e-03 3.43e-03 1.33e-02 1.40e-02 ph/cm2/s
Fluence Cutoff-PL 4.33e-08 6.43e-08 1.34e-08 1.28e-10 1.21e-07 1.21e-07 erg/cm2
Error 1.74e-08 2.50e-08 2.27e-08 9.10e-09 4.41e-08 4.43e-08 erg/cm2
Peak flux Cutoff-PL 2.18e-02 1.87e-02 2.18e-03 1.16e-05 4.27e-02 4.27e-02 ph/cm2/s
Error 8.69e-03 6.90e-03 3.36e-03 6.48e-04 1.24e-02 1.25e-02 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 2.377 0.611 - - 2.33e-04 1.15e-04 54.430 57
CPL -1.055 0.962 28.4 19.2 4.88e-02 9.19e+00 50.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.381 0.603 - - 2.34e-04 1.15e-04 54.840 57
CPL -0.992 0.959 28.3 0.0 4.52e-02 0.00e+00 50.960 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
175.0698 -46.2948 0.0387 8.1 -177.9 0.3653 5.0 TRIG_00416226
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37739 ( -0.543085 0.678626 )
Norm@50keV : 2.33085E-04 ( -0.00011278 0.000117652 )
------------------------------------------------------------
# Chi-Squared = 54.43 using 59 PHA bins.
# Reduced chi-squared = 0.9548 for 57 degrees of freedom
# Null hypothesis probability = 5.722330e-01
Photon flux (15-150 keV) in 64 sec: 4.25617E-02 ( -0.0133815 0.0134575 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44781e-07 ( -5.55265e-08 6.26193e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.05522 ( 1.09671 3.02124 )
Epeak [keV] : 28.4429 ( -28.4721 9.97747 )
Norm@50keV : 4.87657E-02 ( -0.0584344 18.33 )
------------------------------------------------------------
# Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.9032 for 56 degrees of freedom
# Null hypothesis probability = 6.794125e-01
Photon flux (15-150 keV) in 64 sec: 4.23470E-02 ( -0.0125516 0.0126877 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21058e-07 ( -3.99846e-08 4.81318e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.58303 ( -4.90014 -3.33755 )
beta : -9.99848 ( 2089.56 2099.56 )
Epeak [keV] : 28.5225 ( -25.3346 9.74263 )
Norm@50keV : 0.113840 ( -0.108596 13.272 )
------------------------------------------------------------
# Chi-Squared = 50.55 using 59 PHA bins.
# Reduced chi-squared = 0.9190 for 55 degrees of freedom
# Null hypothesis probability = 6.452862e-01
Photon flux (15-150 keV) in 64 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 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.38104 ( -0.535318 0.671453 )
Norm@50keV : 2.34090E-04 ( -0.000112545 0.000117447 )
------------------------------------------------------------
# Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9621 for 57 degrees of freedom
# Null hypothesis probability = 5.566187e-01
Photon flux (15-150 keV) in 64 sec: 4.28378E-02 ( -0.013232 0.0133179 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45541e-07 ( -5.52491e-08 6.2411e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.992094 ( 1.03497 2.95377 )
Epeak [keV] : 28.2689 ( )
Norm@50keV : 4.51517E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.96 using 59 PHA bins.
# Reduced chi-squared = 0.9100 for 56 degrees of freedom
# Null hypothesis probability = 6.655560e-01
Photon flux (15-150 keV) in 64 sec: 4.27145E-02 ( -0.0123464 0.0125296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21818e-07 ( -3.99424e-08 4.79526e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.14434 ( -2.59133 -1.16503 )
beta : -9.37136 ( 9.99981 19.9991 )
Epeak [keV] : 28.2992 ( -10.0557 9.16318 )
Norm@50keV : 5.79171E-02 ( -0.0623263 169.79 )
------------------------------------------------------------
# Chi-Squared = 50.95 using 59 PHA bins.
# Reduced chi-squared = 0.9263 for 55 degrees of freedom
# Null hypothesis probability = 6.301675e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Mar 18 15:09:53 EDT 2010