batgrbproduct Analysis for Trigger=371210
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): Sun Oct 4 08:35:45 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger371210/SDC
======================================================================
Trigger: 00371210 Segment: 000
BAT Trigger Time: 276028321.664 [s; MET]
Trigger Stop: 276028325.76 [s; MET]
UTC: 2009-09-30T18:31:56.533180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.76722018192 Dec: -30.9787039687467 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.68
Image Trigger?: NO
Rate S/N Ratio: 13.2664991614216 [ if not an image trigger ]
Image S/N Ratio: 7.68
Flight Position: [ source = BAT ]
RA: 267.76722018192 Dec: -30.9787039687467 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.787074566964 Dec: -30.9383300349867 [deg; J2000]
{ 17h 51m 08.9s , -30d 56' 18.0" }
+/- 2.49228643940593 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26776035433486 [arcmin] (formal 1-sigma fit error)
SNR: 8.25182242457739
Angular difference between Flight and Ground position is 2.629025 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 8.82399994134903 +/- 2.26152245863188
Measured from: -1.62399995326996
to: 7.19999998807907 [s; relative to TRIGTIME]
T50: 4.24399995803833 +/- 1.81931417459747
Measured from: 0.388000011444092
to: 4.63199996948242 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.40400004386902
to: 4.40400004386902 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.90399998426437
to: 8.02000004053116 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.227180 0.041799 -0.001514 0.012655
0.020632 0.015882 0.013502 0.012047 [error]
Peak 0.035189 0.007378 -0.000456 0.006530
0.006649 0.005182 0.004310 0.003895 [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 6.73e-08 1.14e-08 9.10e-10 7.82e-11 7.97e-08 7.97e-08 erg/cm2
Error 1.17e-08 6.48e-09 1.29e-09 2.40e-10 1.60e-08 1.60e-08 erg/cm2
Peak flux Power-law 3.35e-01 5.76e-02 4.69e-03 4.12e-04 3.98e-01 3.98e-01 ph/cm2/s
Error 1.01e-01 4.42e-02 9.46e-03 2.02e-03 1.30e-01 1.30e-01 ph/cm2/s
Fluence Cutoff-PL 6.73e-08 1.14e-08 9.08e-10 7.76e-11 7.96e-08 7.97e-08 erg/cm2
Error 1.17e-08 6.48e-09 1.28e-09 2.38e-10 1.60e-08 1.60e-08 erg/cm2
Peak flux Cutoff-PL 3.40e-01 5.34e-02 2.11e-03 2.39e-05 3.96e-01 3.97e-01 ph/cm2/s
Error 1.15e-01 5.38e-02 9.39e-03 1.98e-03 1.28e-01 9.67e-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 5.366 1.043 - - 1.20e-04 1.17e-04 49.680 57
CPL 1.000 0.000 50.0 0.0 2.63e-03 0.00e+00 113.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.618 1.451 - - 3.70e-04 5.71e-04 51.110 57
CPL 1.000 0.000 50.0 0.0 5.39e-03 0.00e+00 70.320 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 9.924 -1.904 8.020
T90 8.824 -1.624 7.200
T50 4.244 0.388 4.632
Peak 1.000 3.404 4.404
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.7871 -30.9383 0.0232 0.0 97.8 0.2511 8.3 TRIG_00371210
------------------------------------------
Foreground time interval of the image:
-1.904 8.020 (delta_t = 9.924 [sec])
Background time interval of the image:
-239.664 -1.904 (delta_t = 237.760 [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 -1.904 sec. to 8.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.36644 ( -0.682724 1.40384 )
Norm@50keV : 1.20441E-04 ( -0.000119072 0.000115211 )
------------------------------------------------------------
# Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.8716 for 57 degrees of freedom
# Null hypothesis probability = 7.435360e-01
Photon flux (15-150 keV) in 9.924 sec: 0.262252 ( -0.0469695 0.0468531 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96792e-08 ( -1.5729e-08 1.61907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.904 sec. to 8.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.63479E-03 ( )
------------------------------------------------------------
# Chi-Squared = 113.17 using 59 PHA bins.
# Reduced chi-squared = 2.0210 for 56 degrees of freedom
# Null hypothesis probability = 9.566333e-06
Photon flux (15-150 keV) in 9.924 sec: 0.261960 ( -0.046942 0.046821 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96343e-08 ( -1.57323e-08 1.61944e-08 ) ergs/cm2
Band function
Time interval is from -1.904 sec. to 8.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.20465 ( 2.20465 2.20465 )
beta : -5.64546 ( -1.52269 0.480715 )
Epeak [keV] : 4.03968 ( -4.03968 -4.03968 )
Norm@50keV : 28.2739 ( -28.2739 190.413 )
------------------------------------------------------------
# Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8992 for 55 degrees of freedom
# Null hypothesis probability = 6.856500e-01
Photon flux (15-150 keV) in 9.924 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.404 sec. to 4.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.61757 ( -1.18678 1.71569 )
Norm@50keV : 3.69563E-04 ( -0.000369563 0.000772189 )
------------------------------------------------------------
# Chi-Squared = 51.11 using 59 PHA bins.
# Reduced chi-squared = 0.8966 for 57 degrees of freedom
# Null hypothesis probability = 6.946220e-01
Photon flux (15-150 keV) in 1 sec: 0.397822 ( -0.129355 0.129958 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31832e-08 ( -4.95005e-09 5.68839e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.404 sec. to 4.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.39054E-03 ( )
------------------------------------------------------------
# Chi-Squared = 70.32 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 56 degrees of freedom
# Null hypothesis probability = 9.436110e-02
Photon flux (15-150 keV) in 1 sec: 0.395998 ( -0.127383 0.12944 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31794e-08 ( -4.95115e-09 5.6886e-09 ) ergs/cm2
Band function
Time interval is from 3.404 sec. to 4.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.37892 ( 2.37892 2.37892 )
beta : -4.61756 ( -1.71549 1.1871 )
Epeak [keV] : 1.95958 ( -1.95958 -1.95958 )
Norm@50keV : 3.62926 ( -3.62926 161.593 )
------------------------------------------------------------
# Chi-Squared = 51.11 using 59 PHA bins.
# Reduced chi-squared = 0.9292 for 55 degrees of freedom
# Null hypothesis probability = 6.240646e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sun Oct 4 09:09:18 EDT 2009