batgrbproduct Analysis for Trigger=378831
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 Dec 11 02:22:13 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger378831/GCN5_download_cron
======================================================================
Trigger: 00378831 Segment: 000
BAT Trigger Time: 282132592.896 [s; MET]
Trigger Stop: 282132592.96 [s; MET]
UTC: 2009-12-10T10:09:47.561060 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 84.71140575838 Dec: 26.3087895353856 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 84.71140575838 Dec: 26.3087895353856 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.7166349215486 Dec: 26.3117769730589 [deg; J2000]
{ 05h 38m 52.0s , +26d 18' 42.4" }
+/- 0.410354608371218 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0922021082533878 [arcmin] (formal 1-sigma fit error)
SNR: 108.579523136979
Angular difference between Flight and Ground position is 0.333511 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 238.443999946117 +/- 2.25920696510256
Measured from: -62.6399999260902
to: 175.804000020027 [s; relative to TRIGTIME]
T50: 127.803999960423 +/- 1.78240287255051
Measured from: -9.25599992275238
to: 118.54800003767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.236000001430511
to: 0.763999998569489 [s; relative to TRIGTIME]
Total Fluence
Measured from: -77.7560000419617
to: 308.163999974728 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 24.464138 19.456964 3.234766 0.127478
0.124504 0.122029 0.094257 0.079343 [error]
Peak 0.161768 0.145301 0.024280 -0.000014
0.007524 0.007342 0.005046 0.004116 [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 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 Power-law 1.74e+00 8.79e-01 2.74e-01 1.09e-01 2.95e+00 3.00e+00 ph/cm2/s
Error 1.45e-01 6.17e-02 3.61e-02 2.55e-02 1.97e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 7.88e-06 7.82e-06 2.28e-06 1.30e-07 1.81e-05 1.81e-05 erg/cm2
Error 4.39e-07 1.72e-07 1.25e-07 3.67e-08 5.39e-07 5.41e-07 erg/cm2
Peak flux Cutoff-PL 1.52e+00 1.11e+00 1.51e-01 1.83e-03 2.79e+00 2.79e+00 ph/cm2/s
Error 1.66e-01 9.03e-02 5.03e-02 3.44e-03 2.00e-01 2.00e-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 3.246 0.000 - - 5.84e-03 0.00e+00 339.940 57
CPL 1.000 0.000 50.0 0.0 1.67e-02 0.00e+00 2154.400 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.680 0.131 - - 1.34e-02 1.36e-03 90.190 57
CPL -0.398 1.117 25.8 3.0 1.37e+00 4.53e+00 49.500 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: 171.136000 sec.
T50 in the 50-300 keV band: 107.712000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 385.920 -77.756 308.164
T90 238.444 -62.640 175.804
T50 127.804 -9.256 118.548
Peak 1.000 -0.236 0.764
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.7166 +26.3118 0.0018 0.0 -119.6 34.9461 108.6 TRIG_00378831
------------------------------------------
Foreground time interval of the image:
-10.595 182.180 (delta_t = 192.775 [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
Multiple GTIs in the spectrum
tstart tstop
-77.756000 182.179800
300.104000 308.164000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.24604 ( )
Norm@50keV : 5.83587E-03 ( )
------------------------------------------------------------
# Chi-Squared = 339.94 using 59 PHA bins.
# Reduced chi-squared = 5.9639 for 57 degrees of freedom
# Null hypothesis probability = 6.839175e-42
Photon flux (15-150 keV) in 268 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-77.756000 182.179800
300.104000 308.164000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.66999E-02 ( )
------------------------------------------------------------
# Chi-Squared = 2154.40 using 59 PHA bins.
# Reduced chi-squared = 38.4714 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 268 sec: 1.59321 ( -0.06031 0.06109 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.8101e-05 ( -5.36375e-07 5.41172e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-77.756000 182.179800
300.104000 308.164000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.249858 ( -0.915888 1.17859 )
beta : -4.33598 ( -0.314302 0.4164 )
Epeak [keV] : 21.8917 ( -5.32635 1.55472 )
Norm@50keV : 0.340302 ( -0.17197 1.44477 )
------------------------------------------------------------
# Chi-Squared = 59.30 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 55 degrees of freedom
# Null hypothesis probability = 3.215669e-01
Photon flux (15-150 keV) in 268 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 -0.236 sec. to 0.764 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68005 ( -0.128168 0.133882 )
Norm@50keV : 1.34033E-02 ( -0.00136239 0.00136276 )
------------------------------------------------------------
# Chi-Squared = 90.19 using 59 PHA bins.
# Reduced chi-squared = 1.582 for 57 degrees of freedom
# Null hypothesis probability = 3.339899e-03
Photon flux (15-150 keV) in 1 sec: 2.95221 ( -0.196778 0.196882 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41613e-07 ( -1.03863e-08 1.04924e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.236 sec. to 0.764 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.398184 ( -1.23099 1.00338 )
Epeak [keV] : 25.8309 ( -3.57433 2.33412 )
Norm@50keV : 1.37455 ( -1.11304 7.94389 )
------------------------------------------------------------
# Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8838 for 56 degrees of freedom
# Null hypothesis probability = 7.178734e-01
Photon flux (15-150 keV) in 1 sec: 2.78933 ( -0.19929 0.19998 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22245e-07 ( -9.23e-09 9.577e-09 ) ergs/cm2
Band function
Time interval is from -0.236 sec. to 0.764 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.91684 ( -1.09681 0.82126 )
beta : -3.86572 ( 10 19.9984 )
Epeak [keV] : 26.0560 ( -1.95654 2.05211 )
Norm@50keV : 17.5665 ( -17.2572 937.39 )
------------------------------------------------------------
# Chi-Squared = 47.24 using 59 PHA bins.
# Reduced chi-squared = 0.8590 for 55 degrees of freedom
# Null hypothesis probability = 7.620992e-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 Dec 11 02:41:48 EST 2009