batgrbproduct Analysis for Trigger=358171
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 Jul 24 16:59:16 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger358171/GCN5_download_cron
======================================================================
Trigger: 00358171 Segment: 000
BAT Trigger Time: 270089067.072 [s; MET]
Trigger Stop: 270089068.096 [s; MET]
UTC: 2009-07-24T00:44:22.135320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.695363423989 Dec: 42.3015026277274 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.66
Image Trigger?: NO
Rate S/N Ratio: 13.8924439894498 [ if not an image trigger ]
Image S/N Ratio: 5.66
Flight Position: [ source = BAT ]
RA: 245.695363423989 Dec: 42.3015026277274 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.777916813362 Dec: 42.2306597874874 [deg; J2000]
{ 16h 23m 06.7s , +42d 13' 50.4" }
+/- 3.95816794365511 [arcmin] (estimated 90% radius based on SNR)
+/- 2.65025652181997 [arcmin] (formal 1-sigma fit error)
SNR: 4.26142856337972
Angular difference between Flight and Ground position is 5.612784 arcmin
Partial Coding Fraction: 0.9609375 [ 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: -2.98023223876953e-08
to: 1.02399995923042 [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 0.007148 -0.006307 0.018693 0.019822
0.005497 0.006125 0.005937 0.006327 [error]
Peak 0.007148 -0.006307 0.018693 0.019822
0.005497 0.006125 0.005937 0.006327 [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 2.12e-10 1.44e-09 8.68e-09 2.57e-07 2.97e-08 2.61e-07 erg/cm2
Error 5.52e-10 1.95e-09 7.07e-09 3.60e-07 1.60e-08 3.64e-07 erg/cm2
Peak flux Power-law 6.34e-03 2.29e-02 6.90e-02 6.54e-01 1.92e-01 7.51e-01 ph/cm2/s
Error 1.70e-02 3.20e-02 5.72e-02 7.64e-01 1.54e-01 7.49e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 2.24e-03 1.79e-02 8.33e-02 3.56e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 1.27e-02 2.72e-02 5.02e-02 7.49e-01 0.00e+00 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 -0.590 1.523 - - 1.09e-03 1.17e-03 59.750 57
CPL -4.986 0.000 135.2 129.0 1.28e-02 1.61e-02 58.000 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.590 1.523 - - 1.09e-03 1.17e-03 59.750 57
CPL -4.986 0.000 135.2 129.0 1.28e-02 1.61e-02 58.000 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
245.7779 +42.2307 0.0449 12.8 138.5 0.0513 4.3 TRIG_00358171
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-20.771 -11.072 (delta_t = 9.699 [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: -0.589758 ( -1.84495 1.20109 )
Norm@50keV : 1.09053E-03 ( -0.00109159 0.0012424 )
------------------------------------------------------------
# Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.759469e-01
Photon flux (15-150 keV) in 1.024 sec: 0.191867 ( -0.191867 0.116666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96743e-08 ( -1.59924e-08 1.59924e-08 ) 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: -4.98641 ( )
Epeak [keV] : 135.219 ( -135.241 122.782 )
Norm@50keV : 1.28129E-02 ( -0.012792 0.01945 )
------------------------------------------------------------
# Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 56 degrees of freedom
# Null hypothesis probability = 4.014742e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.38549 ( 0.249536 0.249536 )
beta : -9.59098 ( 12.7393 22.7393 )
Epeak [keV] : 121.740 ( -91.9524 318.78 )
Norm@50keV : 1.90847E-02 ( -0.0187749 0.0149931 )
------------------------------------------------------------
# Chi-Squared = 58.56 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.460721e-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: -0.589758 ( -1.84495 1.20109 )
Norm@50keV : 1.09053E-03 ( -0.00109159 0.0012424 )
------------------------------------------------------------
# Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.759469e-01
Photon flux (15-150 keV) in 1.024 sec: 0.191867 ( -0.191867 0.116666 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96743e-08 ( -1.59924e-08 1.59924e-08 ) 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: -4.98641 ( )
Epeak [keV] : 135.219 ( -135.241 122.782 )
Norm@50keV : 1.28129E-02 ( -0.012792 0.01945 )
------------------------------------------------------------
# Chi-Squared = 58.00 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 56 degrees of freedom
# Null hypothesis probability = 4.014742e-01
Photon flux (15-150 keV) in 1.024 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) 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 : 4.38549 ( 0.249536 0.249536 )
beta : -9.59098 ( 12.7393 22.7393 )
Epeak [keV] : 121.740 ( -91.9524 318.78 )
Norm@50keV : 1.90847E-02 ( -0.0187749 0.0149932 )
------------------------------------------------------------
# Chi-Squared = 58.56 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 55 degrees of freedom
# Null hypothesis probability = 3.460721e-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:
Fri Jul 24 17:16:43 EDT 2009