batgrbproduct Analysis for Trigger=356881
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): Thu Jul 9 23:38:05 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger356881/GCN5_download_cron
======================================================================
Trigger: 00356881 Segment: 000
BAT Trigger Time: 268812154.944 [s; MET]
Trigger Stop: 268812155.968 [s; MET]
UTC: 2009-07-09T06:02:30.048700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.213464633462 Dec: 35.4881673194797 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.12
Image Trigger?: NO
Rate S/N Ratio: 12.8452325786651 [ if not an image trigger ]
Image S/N Ratio: 6.12
Flight Position: [ source = BAT ]
RA: 348.213464633462 Dec: 35.4881673194797 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 348.250544689604 Dec: 35.5048927876 [deg; J2000]
{ 23h 13m 00.1s , +35d 30' 17.6" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.00589354222653 [arcmin] (formal 1-sigma fit error)
SNR: -6.07596002166
Angular difference between Flight and Ground position is 2.070741 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 0.11599999666214 +/- 0.004
Measured from: 106.132000088692
to: 106.248000085354 [s; relative to TRIGTIME]
T50: 0.0799999237060547 +/- 0.004
Measured from: 106.152000129223
to: 106.232000052929 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 105.698000013828
to: 106.698000013828 [s; relative to TRIGTIME]
Total Fluence
Measured from: 106.131999969482
to: 106.259999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.007289 -0.006153 -0.011074 -0.014155
0.002973 0.003415 0.003986 0.004580 [error]
Peak -0.007763 -0.006066 -0.011336 -0.012917
0.003013 0.003504 0.004072 0.004652 [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 2.79e-10 1.75e-10 3.29e-10 1.80e-08 1.03e-09 1.82e-08 erg/cm2
Peak flux Power-law 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 7.43e-02 2.40e-02 2.16e-02 3.46e-01 8.08e-02 3.59e-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 3.02e-10 2.81e-10 4.52e-10 2.05e-08 1.05e-09 2.07e-08 erg/cm2
Peak flux Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 8.10e-02 3.80e-02 2.99e-02 3.91e-01 8.07e-02 4.05e-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 1.500 0.000 - - 0.00e+00 5.72e-04 65.690 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 65.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 0.000 - - 0.00e+00 5.65e-04 62.270 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 62.270 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 0.128 106.132 106.260
T90 0.116 106.132 106.248
T50 0.080 106.152 106.232
Peak 1.000 105.698 106.698
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
348.2505 +35.5049 0.0316 21.3 -0.5 -0.0452 -6.1 TRIG_00356881
------------------------------------------
Foreground time interval of the image:
106.132 106.260 (delta_t = 0.128 [sec])
Background time interval of the image:
-60.944 106.132 (delta_t = 167.076 [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 106.132 sec. to 106.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00114459 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.010634e-01
Photon flux (15-150 keV) in 0.128 sec: 0.0 ( 0 0.168134 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.06734e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 106.132 sec. to 106.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -1 -1 )
Epeak [keV] : 50.0000 ( -50 -50 )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 56 degrees of freedom
# Null hypothesis probability = 1.761881e-01
Photon flux (15-150 keV) in 0.128 sec: 0.0 ( 0 0.168178 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.09932e-09 ) ergs/cm2
Band function
Time interval is from 106.132 sec. to 106.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( 0.98395 0.98395 )
beta : -2.50000 ( 2.5 2.5 )
Epeak [keV] : 80.0000 ( -80 -80 )
Norm@50keV : 0.0 ( 0 653665 )
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.532243e-01
Photon flux (15-150 keV) in 0.128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.010634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.010634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00000 (-4 -4)
R1^2/D10^2 : 0.0 (0 0)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 65.69 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Null hypothesis probability = 1.532243e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 106.132 sec. to 106.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.00113015 )
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.943276e-01
Photon flux (15-150 keV) in 0.132 sec: 0.0 ( 0 0.161562 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.18412e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 106.132 sec. to 106.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -1 -1 )
Epeak [keV] : 50.0000 ( -50 -50 )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 56 degrees of freedom
# Null hypothesis probability = 2.631085e-01
Photon flux (15-150 keV) in 0.132 sec: 0.0 ( 0 0.161408 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 2.31416e-09 ) ergs/cm2
Band function
Time interval is from 106.132 sec. to 106.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( 0.98395 0.98395 )
beta : -2.50000 ( 2.5 2.5 )
Epeak [keV] : 80.0000 ( -80 -80 )
Norm@50keV : 0.0 ( 0 2.17787e+07 )
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.335041e-01
Photon flux (15-150 keV) in 0.132 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.00000 (-5 -5)
R^2/D10^2 : 0.0 (0 0)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.943276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.00000 (-7 -7)
Norm : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.943276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.00000 (-4 -4)
R1^2/D10^2 : 0.0 (0 0)
kT2 [keV] : 10.0000 (-10 -10)
R2^2/D10^2 : 0.0 (0 0)
------------------------------------------------------------
# Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.335041e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Thu Jul 9 23:52:41 EDT 2009