batgrbproduct Analysis for Trigger=354765
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): Sat Jun 13 12:52:25 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger354765/GCN5_download_cron
======================================================================
Trigger: 00354765 Segment: 000
BAT Trigger Time: 266527994.176 [s; MET]
Trigger Stop: 266527995.2 [s; MET]
UTC: 2009-06-12T19:33:09.354500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.100684703509 Dec: 21.0177330985127 [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: 38.4577690460588 [ if not an image trigger ]
Image S/N Ratio: 5.79
Flight Position: [ source = BAT ]
RA: 278.100684703509 Dec: 21.0177330985127 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.142347855468 Dec: 20.9771316865396 [deg; J2000]
{ 18h 32m 34.2s , +20d 58' 37.7" }
+/- 4.49869526855825 [arcmin] (estimated 90% radius based on SNR)
+/- 2.50753916275558 [arcmin] (formal 1-sigma fit error)
SNR: 3.54925789518248
Angular difference between Flight and Ground position is 3.373589 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.024587 0.014914 -0.000039 -0.006426
0.006011 0.005655 0.005257 0.005385 [error]
Peak 0.024587 0.014914 -0.000039 -0.006426
0.006011 0.005655 0.005257 0.005385 [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 6.14e-09 5.38e-09 3.23e-09 2.92e-09 1.60e-08 1.79e-08 erg/cm2
Error 2.54e-09 2.67e-09 2.89e-09 5.46e-09 8.08e-09 1.12e-08 erg/cm2
Peak flux Power-law 1.99e-01 9.74e-02 2.93e-02 1.11e-02 3.32e-01 3.37e-01 ph/cm2/s
Error 8.34e-02 4.67e-02 3.03e-02 2.01e-02 1.31e-01 1.35e-01 ph/cm2/s
Fluence Cutoff-PL 7.23e-09 6.40e-09 3.72e-10 1.84e-13 1.40e-08 1.39e-08 erg/cm2
Error 2.81e-09 3.10e-09 1.13e-09 5.97e-11 3.94e-09 5.03e-09 erg/cm2
Peak flux Cutoff-PL 2.25e-01 1.23e-01 4.14e-03 1.14e-06 3.53e-01 3.52e-01 ph/cm2/s
Error 9.00e-02 5.33e-02 1.14e-02 3.13e-04 1.21e-01 1.21e-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 2.736 0.842 - - 1.45e-03 1.28e-03 65.350 57
CPL -4.980 0.000 23.8 4.8 8.07e+02 5.53e+02 59.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.736 0.842 - - 1.45e-03 1.28e-03 65.350 57
CPL -4.980 0.000 23.8 4.8 8.07e+02 5.53e+02 59.230 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.1423 +20.9771 0.0543 24.5 -157.1 0.0384 3.5 TRIG_00354765
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.176 -10.176 (delta_t = 50.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73605 ( -0.722297 0.96202 )
Norm@50keV : 1.45075E-03 ( -0.00145087 0.00110759 )
------------------------------------------------------------
# Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.094961e-01
Photon flux (15-150 keV) in 1.024 sec: 0.331702 ( -0.128871 0.132277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60095e-08 ( -7.35658e-09 8.8056e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.97956 ( )
Epeak [keV] : 23.7587 ( -4.31646 5.22391 )
Norm@50keV : 807.402 ( -807.402 299.064 )
------------------------------------------------------------
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.586148e-01
Photon flux (15-150 keV) in 1.024 sec: 0.352557 ( -0.120706 0.120759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40071e-08 ( -5.00303e-09 2.87355e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99724 ( -703.811 -688.832 )
beta : -9.37167 ( 10 19.9938 )
Epeak [keV] : 23.7098 ( -2.45057 5.26934 )
Norm@50keV : 847.580 ( -845.091 2372.88 )
------------------------------------------------------------
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.239110e-01
Photon flux (15-150 keV) in 1.024 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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73605 ( -0.722297 0.96202 )
Norm@50keV : 1.45075E-03 ( -0.00145087 0.00110759 )
------------------------------------------------------------
# Chi-Squared = 65.35 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.094961e-01
Photon flux (15-150 keV) in 1.024 sec: 0.331702 ( -0.128871 0.132277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60095e-08 ( -7.35658e-09 8.8056e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.97956 ( )
Epeak [keV] : 23.7587 ( -4.31646 5.22391 )
Norm@50keV : 807.402 ( -807.402 299.064 )
------------------------------------------------------------
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.586148e-01
Photon flux (15-150 keV) in 1.024 sec: 0.352557 ( -0.120706 0.120759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40071e-08 ( -5.00303e-09 2.87355e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99724 ( -703.815 -688.832 )
beta : -9.37167 ( 10 19.9938 )
Epeak [keV] : 23.7098 ( -2.45057 5.26934 )
Norm@50keV : 847.580 ( -845.091 2372.88 )
------------------------------------------------------------
# Chi-Squared = 59.23 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.239110e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Sat Jun 13 13:04:47 EDT 2009