batgrbproduct Analysis for Trigger=357072
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 Jul 12 18:36:20 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357072/GCN5_download_cron
======================================================================
Trigger: 00357072 Segment: 000
BAT Trigger Time: 269063470.08 [s; MET]
Trigger Stop: 269063474.176 [s; MET]
UTC: 2009-07-12T03:51:05.176560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 70.1028622577386 Dec: 22.5571323863833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.56
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 7.56
Flight Position: [ source = BAT ]
RA: 70.1028622577386 Dec: 22.5571323863833 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 70.0960071714447 Dec: 22.5250506548202 [deg; J2000]
{ 04h 40m 23.0s , +22d 31' 30.2" }
+/- 1.5946688750461 [arcmin] (estimated 90% radius based on SNR)
+/- 0.521823525447503 [arcmin] (formal 1-sigma fit error)
SNR: 15.616692862262
Angular difference between Flight and Ground position is 1.962031 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 187.783999979496 +/- 47.3618285197352
Measured from: -72.0519998669624
to: 115.732000112534 [s; relative to TRIGTIME]
T50: 37.2599999308586 +/- 10.2770199566541
Measured from: -15.8719998598099
to: 21.3880000710487 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -6.09599995613098
to: -5.09599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: -99.3079999685287
to: 158.120000004768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.464684 1.941178 1.874085 0.471166
0.106941 0.112954 0.104990 0.103600 [error]
Peak 0.026668 0.040461 0.034751 0.013046
0.007075 0.007461 0.007006 0.006810 [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 4.46e-07 9.10e-07 1.45e-06 5.13e-06 4.02e-06 7.94e-06 erg/cm2
Error 5.01e-08 5.96e-08 1.05e-07 8.47e-07 2.59e-07 9.10e-07 erg/cm2
Peak flux Power-law 2.72e-01 2.88e-01 2.16e-01 2.63e-01 8.76e-01 1.04e+00 ph/cm2/s
Error 9.40e-02 6.39e-02 5.63e-02 1.38e-01 1.84e-01 2.24e-01 ph/cm2/s
Fluence Cutoff-PL 4.40e-07 9.15e-07 1.46e-06 4.67e-06 4.01e-06 7.38e-06 erg/cm2
Error 5.83e-08 6.46e-08 1.10e-07 1.63e-06 2.52e-07 1.66e-06 erg/cm2
Peak flux Cutoff-PL 2.22e-01 3.22e-01 2.32e-01 8.12e-02 8.34e-01 8.56e-01 ph/cm2/s
Error 1.10e-01 7.98e-02 6.74e-02 1.89e-01 2.39e-01 0.00e+00 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 1.329 0.107 - - 1.59e-03 9.22e-05 54.710 57
CPL 1.264 0.000 614.1 0.0 1.71e-03 7.53e-04 54.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.415 0.346 - - 7.16e-03 1.53e-03 54.860 57
CPL 0.203 1.642 72.0 -25.6 3.01e-02 1.38e-01 52.660 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: 85.824000 sec.
T50 in the 50-300 keV band: 32.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 257.428 -99.308 158.120
T90 187.784 -72.052 115.732
T50 37.260 -15.872 21.388
Peak 1.000 -6.096 -5.096
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
70.0960 +22.5251 0.0123 35.2 -22.1 5.6745 15.6 TRIG_00357072
------------------------------------------
Foreground time interval of the image:
-99.308 158.120 (delta_t = 257.428 [sec])
Background time interval of the image:
-239.080 -99.308 (delta_t = 139.772 [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 -99.308 sec. to 158.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32906 ( -0.107502 0.107078 )
Norm@50keV : 1.59298E-03 ( -9.22624e-05 9.22222e-05 )
------------------------------------------------------------
# Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9598 for 57 degrees of freedom
# Null hypothesis probability = 5.616095e-01
Photon flux (15-150 keV) in 257.4 sec: 0.191101 ( -0.0115288 0.0115618 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02391e-06 ( -2.58543e-07 2.59874e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -99.308 sec. to 158.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26448 ( )
Epeak [keV] : 614.054 ( -614.959 -614.959 )
Norm@50keV : 1.70549E-03 ( -0.000614751 0.000892123 )
------------------------------------------------------------
# Chi-Squared = 54.63 using 59 PHA bins.
# Reduced chi-squared = 0.9755 for 56 degrees of freedom
# Null hypothesis probability = 5.269546e-01
Photon flux (15-150 keV) in 257.4 sec: 0.190399 ( -0.012084 0.012012 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.00841e-06 ( -2.39202e-07 2.65328e-07 ) ergs/cm2
Band function
Time interval is from -99.308 sec. to 158.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79689 ( -11.3676 -11.3676 )
beta : -1.35042 ( -0.119989 0.108714 )
Epeak [keV] : 22.7156 ( -22.6999 4.46893 )
Norm@50keV : 177.462 ( -178.589 271.263 )
------------------------------------------------------------
# Chi-Squared = 53.92 using 59 PHA bins.
# Reduced chi-squared = 0.9804 for 55 degrees of freedom
# Null hypothesis probability = 5.159049e-01
Photon flux (15-150 keV) in 257.4 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 -6.096 sec. to -5.096 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41518 ( -0.344265 0.346896 )
Norm@50keV : 7.16485E-03 ( -0.00153595 0.00152189 )
------------------------------------------------------------
# Chi-Squared = 54.86 using 59 PHA bins.
# Reduced chi-squared = 0.9625 for 57 degrees of freedom
# Null hypothesis probability = 5.557863e-01
Photon flux (15-150 keV) in 1 sec: 0.875604 ( -0.184081 0.184477 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.90252e-08 ( -1.61093e-08 1.65393e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.096 sec. to -5.096 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.203285 ( -1.94541 1.33858 )
Epeak [keV] : 72.0155 ( -20.8423 -72.0157 )
Norm@50keV : 3.00940E-02 ( -0.0300937 0.24565 )
------------------------------------------------------------
# Chi-Squared = 52.66 using 59 PHA bins.
# Reduced chi-squared = 0.9403 for 56 degrees of freedom
# Null hypothesis probability = 6.021646e-01
Photon flux (15-150 keV) in 1 sec: 0.834237 ( -0.188954 0.189823 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.89782e-08 ( -1.84698e-08 1.63808e-08 ) ergs/cm2
Band function
Time interval is from -6.096 sec. to -5.096 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.205741 ( -8.41797 1.43235 )
beta : -9.28980 ( 7.899 17.899 )
Epeak [keV] : 72.2248 ( -35.281 150.531 )
Norm@50keV : 2.99422E-02 ( -0.0299297 0.0241806 )
------------------------------------------------------------
# Chi-Squared = 52.66 using 59 PHA bins.
# Reduced chi-squared = 0.9574 for 55 degrees of freedom
# Null hypothesis probability = 5.646259e-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 Jul 12 18:49:07 EDT 2009