batgrbproduct Analysis for Trigger=357621
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 17 12:41:05 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger357621/GCN5_download_cron
======================================================================
Trigger: 00357621 Segment: 000
BAT Trigger Time: 269487842.496 [s; MET]
Trigger Stop: 269487843.52 [s; MET]
UTC: 2009-07-17T01:43:57.578800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 222.881949561761 Dec: 20.8124596003905 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.69
Image Trigger?: NO
Rate S/N Ratio: 13.228756555323 [ if not an image trigger ]
Image S/N Ratio: 5.69
Flight Position: [ source = BAT ]
RA: 222.881949561761 Dec: 20.8124596003905 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 222.85106717879 Dec: 20.7902904555842 [deg; J2000]
{ 14h 51m 24.3s , +20d 47' 25.0" }
+/- 3.69160841748251 [arcmin] (estimated 90% radius based on SNR)
+/- 1.68605437245852 [arcmin] (formal 1-sigma fit error)
SNR: 4.70771692235391
Angular difference between Flight and Ground position is 2.183961 arcmin
Partial Coding Fraction: 0.7421875 [ 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: 1.02400001883507 [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 0.013614 0.003609 0.026253 0.042031
0.008357 0.008922 0.009518 0.010802 [error]
Peak 0.013614 0.003609 0.026253 0.042031
0.008357 0.008922 0.009518 0.010802 [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 4.04e-10 2.79e-09 1.70e-08 5.10e-07 5.82e-08 5.30e-07 erg/cm2
Error 1.05e-09 3.73e-09 1.31e-08 6.69e-07 4.15e-08 6.75e-07 erg/cm2
Peak flux Power-law 1.21e-02 4.43e-02 1.35e-01 1.30e+00 3.75e-01 1.49e+00 ph/cm2/s
Error 3.23e-02 6.14e-02 1.06e-01 1.37e+00 2.86e-01 1.31e+00 ph/cm2/s
Fluence Cutoff-PL 1.06e-10 1.74e-09 1.82e-08 2.05e-07 6.09e-08 2.25e-07 erg/cm2
Error 9.60e-10 3.32e-09 1.10e-08 7.65e-07 2.56e-08 4.45e-07 erg/cm2
Peak flux Cutoff-PL 1.22e-02 4.44e-02 1.35e-01 1.29e+00 3.76e-01 1.48e+00 ph/cm2/s
Error 3.22e-02 6.14e-02 1.06e-01 1.52e+00 2.86e-01 1.46e+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 -0.604 1.473 - - 2.12e-03 2.22e-03 61.280 57
CPL -4.854 0.000 166.8 161.5 8.70e-03 1.97e-02 60.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.604 1.473 - - 2.12e-03 2.22e-03 61.280 57
CPL -4.854 0.000 166.8 161.5 8.70e-03 1.97e-02 60.810 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
222.8511 +20.7903 0.0411 33.6 -174.7 0.0907 4.7 TRIG_00357621
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.496 -10.496 (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: -0.604237 ( -1.80281 1.14284 )
Norm@50keV : 2.11920E-03 ( -0.0021192 0.00231613 )
------------------------------------------------------------
# Chi-Squared = 61.28 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.252887e-01
Photon flux (15-150 keV) in 1.024 sec: 0.375270 ( -0.37527 0.19755 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81901e-08 ( -5.81901e-08 2.48347e-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: -4.85433 ( )
Epeak [keV] : 166.828 ( -166.825 156.145 )
Norm@50keV : 8.69999E-03 ( -0.00870142 0.0306837 )
------------------------------------------------------------
# Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.067549e-01
Photon flux (15-150 keV) in 1.024 sec: 0.376094 ( -0.376094 0.196633 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09077e-08 ( -2.56114e-08 2.56031e-08 ) 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 : -0.106182 ( 0.106182 0.106182 )
beta : 0.604365 ( -1.14175 1.80429 )
Epeak [keV] : 17.9784 ( -17.9811 -17.9811 )
Norm@50keV : 3.55503E-03 ( -0.00355542 25806.6 )
------------------------------------------------------------
# Chi-Squared = 61.28 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.610742e-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: -0.604237 ( -1.80281 1.14284 )
Norm@50keV : 2.11920E-03 ( -0.0021192 0.00231613 )
------------------------------------------------------------
# Chi-Squared = 61.28 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 57 degrees of freedom
# Null hypothesis probability = 3.252887e-01
Photon flux (15-150 keV) in 1.024 sec: 0.375270 ( -0.37527 0.19755 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.81901e-08 ( -5.81901e-08 2.48347e-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: -4.85433 ( )
Epeak [keV] : 166.828 ( -166.825 156.145 )
Norm@50keV : 8.69999E-03 ( -0.00870142 0.0306837 )
------------------------------------------------------------
# Chi-Squared = 60.81 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 56 degrees of freedom
# Null hypothesis probability = 3.067549e-01
Photon flux (15-150 keV) in 1.024 sec: 0.376094 ( -0.376094 0.196633 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09077e-08 ( -2.56114e-08 2.56031e-08 ) 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 : -0.106182 ( 0.106182 0.106182 )
beta : 0.604365 ( -1.14175 1.80429 )
Epeak [keV] : 17.9784 ( -17.9811 -17.9811 )
Norm@50keV : 3.55503E-03 ( -0.00355542 25806.6 )
------------------------------------------------------------
# Chi-Squared = 61.28 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 55 degrees of freedom
# Null hypothesis probability = 2.610742e-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 17 12:57:18 EDT 2009