batgrbproduct Analysis for Trigger=411248
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 Feb 5 11:44:37 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger411248/GCN5_download_cron
======================================================================
Trigger: 00411248 Segment: 000
BAT Trigger Time: 287036328.576 [s; MET]
Trigger Stop: 287036340.736 [s; MET]
UTC: 2010-02-05T04:18:43.074340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 141.405845835995 Dec: 31.7394932106859 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 13.3790881602597 [ if not an image trigger ]
Image S/N Ratio: 8.08
Flight Position: [ source = BAT ]
RA: 141.405845835995 Dec: 31.7394932106859 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 141.38539186261 Dec: 31.7399261918652 [deg; J2000]
{ 09h 25m 32.5s , +31d 44' 23.7" }
+/- 2.13656084321838 [arcmin] (estimated 90% radius based on SNR)
+/- 0.702822252561615 [arcmin] (formal 1-sigma fit error)
SNR: 10.2824492128479
Angular difference between Flight and Ground position is 1.044024 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 25.9999999403954 +/- 7.54246246845914
Measured from: -9.72399985790253
to: 16.2760000824928 [s; relative to TRIGTIME]
T50: 13.663999915123 +/- 4.43940764628902
Measured from: -0.219999849796295
to: 13.4440000653267 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.11599999666214
to: 9.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.5759999752045
to: 25.5560000538826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.239493 0.246725 0.167438 0.073921
0.030907 0.032325 0.029392 0.027182 [error]
Peak 0.008388 0.021358 0.012395 0.015451
0.005143 0.005382 0.004716 0.004395 [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 5.98e-08 1.03e-07 1.36e-07 3.65e-07 3.98e-07 6.64e-07 erg/cm2
Error 1.27e-08 1.42e-08 2.85e-08 1.59e-07 6.73e-08 1.85e-07 erg/cm2
Peak flux Power-law 1.06e-01 1.19e-01 9.59e-02 1.29e-01 3.68e-01 4.49e-01 ph/cm2/s
Error 6.18e-02 4.31e-02 3.87e-02 1.16e-01 1.21e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 5.86e-08 1.07e-07 1.35e-07 2.23e-07 3.85e-07 5.23e-07 erg/cm2
Error 1.39e-08 1.86e-08 3.05e-08 2.63e-07 7.92e-08 2.72e-07 erg/cm2
Peak flux Cutoff-PL 1.06e-01 1.19e-01 9.59e-02 1.28e-01 3.68e-01 4.48e-01 ph/cm2/s
Error 6.18e-02 4.31e-02 3.88e-02 1.15e-01 1.21e-01 1.55e-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 1.602 0.248 - - 1.12e-03 1.72e-04 50.420 57
CPL 1.151 0.849 82.2 0.0 1.98e-03 0.00e+00 50.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.312 0.612 - - 3.08e-03 1.01e-03 59.460 57
CPL 1.309 0.534 9999.4 0.0 3.09e-03 2.70e-02 59.460 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: 17.152000 sec.
T50 in the 50-300 keV band: 9.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 38.132 -12.576 25.556
T90 26.000 -9.724 16.276
T50 13.664 -0.220 13.444
Peak 1.000 8.116 9.116
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
141.3854 +31.7399 0.0186 18.3 125.8 0.6744 10.3 TRIG_00411248
------------------------------------------
Foreground time interval of the image:
-12.576 25.556 (delta_t = 38.132 [sec])
Background time interval of the image:
-239.576 -12.576 (delta_t = 227.000 [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
Time interval is from -12.576 sec. to 25.556 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60165 ( -0.244861 0.252113 )
Norm@50keV : 1.11638E-03 ( -0.000173774 0.000170008 )
------------------------------------------------------------
# Chi-Squared = 50.42 using 59 PHA bins.
# Reduced chi-squared = 0.8846 for 57 degrees of freedom
# Null hypothesis probability = 7.185815e-01
Photon flux (15-150 keV) in 38.13 sec: 0.143533 ( -0.0197268 0.0197296 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.98016e-07 ( -6.63298e-08 6.81928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.576 sec. to 25.556 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15079 ( -1.01435 0.683173 )
Epeak [keV] : 82.2100 ( )
Norm@50keV : 1.98169E-03 ( )
------------------------------------------------------------
# Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.8983 for 56 degrees of freedom
# Null hypothesis probability = 6.894238e-01
Photon flux (15-150 keV) in 38.13 sec: 0.141938 ( -0.020559 0.020332 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.84716e-07 ( -8.05328e-08 7.7831e-08 ) ergs/cm2
Band function
Time interval is from -12.576 sec. to 25.556 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.80236 ( -11.6289 -11.6289 )
beta : -1.72747 ( -0.377922 0.288053 )
Epeak [keV] : 24.2448 ( -24.0521 5.87281 )
Norm@50keV : 114.022 ( -121.744 81.6848 )
------------------------------------------------------------
# Chi-Squared = 48.64 using 59 PHA bins.
# Reduced chi-squared = 0.8844 for 55 degrees of freedom
# Null hypothesis probability = 7.146222e-01
Photon flux (15-150 keV) in 38.13 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit
Power-law model
Time interval is from 8.116 sec. to 9.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31197 ( -0.627078 0.5972 )
Norm@50keV : 3.07716E-03 ( -0.00101669 0.00100319 )
------------------------------------------------------------
# Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.860711e-01
Photon flux (15-150 keV) in 1 sec: 0.367935 ( -0.120423 0.120747 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03199e-08 ( -1.10908e-08 1.15211e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.116 sec. to 9.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30877 ( -2.30527 -1.23784 )
Epeak [keV] : 9999.35 ( )
Norm@50keV : 3.08973E-03 ( -0.00102412 0.0528913 )
------------------------------------------------------------
# Chi-Squared = 59.46 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.506958e-01
Photon flux (15-150 keV) in 1 sec: 0.367823 ( -0.120391 0.120713 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.03195e-08 ( -1.1093e-08 1.1525e-08 ) ergs/cm2
Band function
Time interval is from 8.116 sec. to 9.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.72349 ( -24.3735 -24.3735 )
beta : -1.49324 ( -1.2431 0.720583 )
Epeak [keV] : 30.0234 ( -26.5292 147.923 )
Norm@50keV : 13.7119 ( -13.7702 75.7147 )
------------------------------------------------------------
# Chi-Squared = 59.10 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 55 degrees of freedom
# Null hypothesis probability = 3.282787e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Feb 5 12:03:45 EST 2010