batgrbproduct Analysis for Trigger=362752
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): Tue Sep 15 11:16:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger362752/GCN5_download_cron
======================================================================
Trigger: 00362752 Segment: 000
BAT Trigger Time: 274663086.016 [s; MET]
Trigger Stop: 274663094.208 [s; MET]
UTC: 2009-09-14T23:18:00.930140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.728183631329 Dec: -3.63694334599726 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.79
Image Trigger?: NO
Rate S/N Ratio: 34.4093010681705 [ if not an image trigger ]
Image S/N Ratio: 5.79
Flight Position: [ source = BAT ]
RA: 252.728183631329 Dec: -3.63694334599726 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.77816659096 Dec: -3.71257813619341 [deg; J2000]
{ 16h 51m 06.8s , -03d 42' 45.3" }
+/- 6.51107773745525 [arcmin] (estimated 90% radius based on SNR)
+/- 4.11426632628365 [arcmin] (formal 1-sigma fit error)
SNR: 2.09294165700423
Angular difference between Flight and Ground position is 5.436098 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 8.19200003147125 +/-
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
T50: 8.19200003147125 +/-
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200003147125 second)
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200003147125 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.081897 0.020541 -0.006128 -0.033562
0.020265 0.019820 0.017685 0.016570 [error]
Peak 0.081897 0.020541 -0.006128 -0.033562
0.020265 0.019820 0.017685 0.016570 [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 1.97e-08 1.19e-08 4.65e-09 2.43e-09 3.76e-08 3.75e-08 erg/cm2
Error 9.53e-09 9.04e-09 7.45e-09 9.36e-09 2.36e-08 2.78e-08 erg/cm2
Peak flux Power-law 8.08e-02 2.77e-02 5.41e-03 1.24e-03 1.15e-01 1.14e-01 ph/cm2/s
Error 3.94e-02 2.01e-02 8.32e-03 4.25e-03 5.72e-02 5.78e-02 ph/cm2/s
Fluence Cutoff-PL 2.35e-08 1.01e-08 1.41e-10 3.80e-15 3.37e-08 3.35e-08 erg/cm2
Error 1.06e-08 8.24e-09 4.49e-09 2.47e-10 1.64e-08 1.64e-08 erg/cm2
Peak flux Cutoff-PL 9.38e-02 2.59e-02 2.12e-04 3.33e-09 1.20e-01 1.20e-01 ph/cm2/s
Error 4.34e-02 1.75e-02 5.17e-03 6.20e-04 5.34e-02 5.34e-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 3.325 1.379 - - 3.27e-04 3.83e-04 65.460 57
CPL -4.987 0.000 19.0 5.2 1.44e+03 1.05e+03 62.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.325 1.379 - - 3.27e-04 3.83e-04 65.460 57
CPL -4.987 0.000 19.0 5.2 1.44e+03 1.05e+03 62.870 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 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.7782 -3.7126 0.0922 33.2 -167.7 0.0966 2.1 TRIG_00362752
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [sec])
Background time interval of the image:
-60.016 -41.679 (delta_t = 18.337 [sec])
-41.016 -30.016 (delta_t = 11.000 [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 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.32534 ( -1.02138 1.7374 )
Norm@50keV : 3.27289E-04 ( -0.000325089 0.000441587 )
------------------------------------------------------------
# Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.067845e-01
Photon flux (15-150 keV) in 8.192 sec: 0.114647 ( -0.0564626 0.0578973 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76052e-08 ( -2.04348e-08 2.67334e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98659 ( )
Epeak [keV] : 19.0371 ( -4.62362 5.85467 )
Norm@50keV : 1439.44 ( -1439.52 659.958 )
------------------------------------------------------------
# Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.461724e-01
Photon flux (15-150 keV) in 8.192 sec: 0.119929 ( -0.0532943 0.0535 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37044e-08 ( -1.57214e-08 1.71515e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.84579 ( 0.610209 5.60365 )
beta : -6.01415 ( 6.3273 16.3269 )
Epeak [keV] : 17.3269 ( -11.7323 14.9378 )
Norm@50keV : 33.2862 ( -33.2933 2368.84 )
------------------------------------------------------------
# Chi-Squared = 63.28 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.073783e-01
Photon flux (15-150 keV) in 8.192 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 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.32534 ( -1.02138 1.7374 )
Norm@50keV : 3.27289E-04 ( -0.000325089 0.000441587 )
------------------------------------------------------------
# Chi-Squared = 65.46 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.067845e-01
Photon flux (15-150 keV) in 8.192 sec: 0.114647 ( -0.0564626 0.0578973 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76052e-08 ( -2.04348e-08 2.67334e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.98659 ( )
Epeak [keV] : 19.0371 ( -4.62362 5.85467 )
Norm@50keV : 1439.44 ( -1439.52 659.958 )
------------------------------------------------------------
# Chi-Squared = 62.87 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.461724e-01
Photon flux (15-150 keV) in 8.192 sec: 0.119929 ( -0.0532943 0.0535 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37044e-08 ( -1.57214e-08 1.71515e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.84579 ( 0.610209 5.60365 )
beta : -6.01415 ( 6.3273 16.3269 )
Epeak [keV] : 17.3269 ( -11.7323 14.9378 )
Norm@50keV : 33.2862 ( -33.2933 2368.84 )
------------------------------------------------------------
# Chi-Squared = 63.28 using 59 PHA bins.
# Reduced chi-squared = 1.150 for 55 degrees of freedom
# Null hypothesis probability = 2.073783e-01
Photon flux (15-150 keV) in 8.192 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Sep 15 11:32:46 EDT 2009