batgrbproduct Analysis for Trigger=378554
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 Dec 8 16:34:35 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger378554/GCN5_download_cron
======================================================================
Trigger: 00378554 Segment: 000
BAT Trigger Time: 281954765.888 [s; MET]
Trigger Stop: 281954766.912 [s; MET]
UTC: 2009-12-08T08:46:00.559040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.274140327777107 Dec: 65.6736677782883 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.41
Image Trigger?: NO
Rate S/N Ratio: 55.4707129934347 [ if not an image trigger ]
Image S/N Ratio: 14.41
Flight Position: [ source = BAT ]
RA: 0.274140327777107 Dec: 65.6736677782883 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 0.280622888890922 Dec: 65.6581096559212 [deg; J2000]
{ 00h 01m 07.3s , +65d 39' 29.2" }
+/- 1.374393022434 [arcmin] (estimated 90% radius based on SNR)
+/- 0.5626645754438 [arcmin] (formal 1-sigma fit error)
SNR: 19.311545636944
Angular difference between Flight and Ground position is 0.947146 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 71.2959999442101 +/- 30.7508121795359
Measured from: 0.272000133991241
to: 71.5680000782013 [s; relative to TRIGTIME]
T50: 28.8559999465942 +/- 14.8674927262875
Measured from: 2.62000012397766
to: 31.4760000705719 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.15200001001358
to: 1.15200001001358 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.328000009059906
to: 119.747999966145 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.562417 0.719929 0.902448 0.380331
0.058732 0.061569 0.055847 0.049468 [error]
Peak 0.031666 0.051556 0.107105 0.057454
0.005931 0.006703 0.007366 0.006601 [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 1.33e-07 3.35e-07 6.76e-07 3.41e-06 1.82e-06 4.57e-06 erg/cm2
Error 2.21e-08 3.20e-08 5.26e-08 6.62e-07 1.39e-07 6.79e-07 erg/cm2
Peak flux Power-law 1.93e-01 3.99e-01 6.46e-01 2.34e+00 1.79e+00 3.58e+00 ph/cm2/s
Error 4.98e-02 6.26e-02 5.46e-02 4.70e-01 1.60e-01 4.42e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-07 3.36e-07 6.77e-07 3.39e-06 1.82e-06 4.31e-06 erg/cm2
Error 2.21e-08 3.20e-08 5.27e-08 6.58e-07 1.39e-07 9.18e-07 erg/cm2
Peak flux Cutoff-PL 1.92e-01 3.99e-01 6.46e-01 2.33e+00 1.79e+00 3.57e+00 ph/cm2/s
Error 4.97e-02 6.26e-02 5.47e-02 4.68e-01 1.60e-01 4.40e-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 0.990 0.139 - - 1.41e-03 1.04e-04 53.530 57
CPL 0.984 0.140 9999.4 0.0 1.42e-03 8.74e-04 53.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.307 0.182 - - 1.45e-02 1.63e-03 33.340 57
CPL 0.305 0.184 9999.4 0.0 1.47e-02 4.91e-03 33.370 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: 27.136000 sec.
T50 in the 50-300 keV band: 10.368000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 120.076 -0.328 119.748
T90 71.296 0.272 71.568
T50 28.856 2.620 31.476
Peak 1.000 0.152 1.152
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.2806 +65.6581 0.0100 25.8 -177.7 2.6462 19.3 TRIG_00378554
------------------------------------------
Foreground time interval of the image:
-0.328 100.342 (delta_t = 100.670 [sec])
101.112 119.748 (delta_t = 18.636 [sec])
Background time interval of the image:
-239.888 -0.328 (delta_t = 239.560 [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
Multiple GTIs in the spectrum
tstart tstop
-0.328000 100.342000
101.112000 119.748000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.989574 ( -0.141107 0.137066 )
Norm@50keV : 1.40910E-03 ( -0.000104652 0.000103834 )
------------------------------------------------------------
# Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9391 for 57 degrees of freedom
# Null hypothesis probability = 6.060504e-01
Photon flux (15-150 keV) in 119.3 sec: 0.162137 ( -0.0123145 0.0123835 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82413e-06 ( -1.38312e-07 1.39647e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.328000 100.342000
101.112000 119.748000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.984199 ( -0.142734 0.137685 )
Epeak [keV] : 9999.36 ( -9996.84 -9996.84 )
Norm@50keV : 1.41763E-03 ( -0.00141763 0.000329917 )
------------------------------------------------------------
# Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9571 for 56 degrees of freedom
# Null hypothesis probability = 5.663638e-01
Photon flux (15-150 keV) in 119.3 sec: 0.162075 ( -0.012318 0.012358 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82499e-06 ( -1.3871e-07 1.39533e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.328000 100.342000
101.112000 119.748000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.868095 ( 0.868095 0.868095 )
beta : -0.989565 ( -0.137095 0.141053 )
Epeak [keV] : 41.6838 ( -41.6834 -41.6834 )
Norm@50keV : 2.13321E-03 ( -0.000689444 2841.11 )
------------------------------------------------------------
# Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9733 for 55 degrees of freedom
# Null hypothesis probability = 5.309602e-01
Photon flux (15-150 keV) in 119.3 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 0.152 sec. to 1.152 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.306741 ( -0.187696 0.176401 )
Norm@50keV : 1.45143E-02 ( -0.00166178 0.00160801 )
------------------------------------------------------------
# Chi-Squared = 33.34 using 59 PHA bins.
# Reduced chi-squared = 0.5849 for 57 degrees of freedom
# Null hypothesis probability = 9.948230e-01
Photon flux (15-150 keV) in 1 sec: 1.78768 ( -0.160097 0.16062 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.16109e-07 ( -1.90525e-08 1.90829e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.305297 ( -0.198821 0.170073 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 1.47090E-02 ( -0.00159464 0.00823281 )
------------------------------------------------------------
# Chi-Squared = 33.37 using 59 PHA bins.
# Reduced chi-squared = 0.5960 for 56 degrees of freedom
# Null hypothesis probability = 9.929775e-01
Photon flux (15-150 keV) in 1 sec: 1.78729 ( -0.16003 0.16055 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1624e-07 ( -1.9069e-08 1.9102e-08 ) ergs/cm2
Band function
Time interval is from 0.152 sec. to 1.152 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.810133 ( 0.810133 0.810133 )
beta : -0.306742 ( -0.176275 0.187672 )
Epeak [keV] : 20.1927 ( -20.1927 -20.1927 )
Norm@50keV : 1.93865E-02 ( -0.00644192 90548.5 )
------------------------------------------------------------
# Chi-Squared = 33.34 using 59 PHA bins.
# Reduced chi-squared = 0.6061 for 55 degrees of freedom
# Null hypothesis probability = 9.907997e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Tue Dec 8 16:52:50 EST 2009