batgrbproduct Analysis for Trigger=331821
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 v2.41
Process Start Time (local time): Thu Oct 16 12:13:01 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger331821/GCN5_download_cron
======================================================================
Trigger: 00331821 Segment: 000
BAT Trigger Time: 245848976 [s; MET]
Trigger Stop: 245849040 [s; MET]
UTC: 2008-10-16T11:22:52.820860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 38.6023618682475 Dec: -43.7967683317673 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.68
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.68
Flight Position: [ source = BAT ]
RA: 38.6023618682475 Dec: -43.7967683317673 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 38.6283299828847 Dec: -43.7985040166123 [deg; J2000]
{ 02h 34m 30.8s , -43d 47' 54.6" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 2.76993685164317 [arcmin] (formal 1-sigma fit error)
SNR: -3.55709082283577
Angular difference between Flight and Ground position is 1.129421 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 0.0479999780654907 +/- 0.016
Measured from: -47.9119999110699
to: -47.8639999330044 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.016
Measured from: -47.8959999084473
to: -47.879999935627 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -48.3720000088215
to: -47.3720000088215 [s; relative to TRIGTIME]
Total Fluence
Measured from: -47.9120000004768
to: -47.8479999899864 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.006256 -0.001075 -0.005447 -0.002747
0.001846 0.002080 0.001905 0.001844 [error]
Peak -0.004328 -0.001071 -0.003981 -0.003602
0.002075 0.002354 0.002102 0.002082 [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 1.29e-10 1.10e-10 1.33e-10 4.02e-09 4.25e-10 4.04e-09 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 7.27e-02 3.02e-02 1.87e-02 1.27e-01 9.51e-02 9.69e-02 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 1.29e-10 2.13e-10 2.63e-10 4.27e-09 5.02e-10 4.29e-09 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 7.25e-02 5.88e-02 4.22e-02 1.38e-01 1.10e-01 1.03e-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 1.30e-10 2.00e-10 2.55e-10 1.55e-08 4.95e-10 3.54e-09 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 7.54e-02 3.29e-02 3.94e-02 6.01e-02 1.05e-01 1.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 5.46e-04 51.065 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 5.00e+23 51.065 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.500 6.500 - - 0.00e+00 6.28e-04 43.623 57
CPL 1.000 6.500 50.0 5000.0 0.00e+00 5.00e+23 43.623 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 0.064 -47.912 -47.848
T90 0.048 -47.912 -47.864
T50 0.016 -47.896 -47.880
Peak 1.000 -48.372 -47.372
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
38.6283 -43.7985 0.0539 42.9 166.3 -0.0141 -3.6 TRIG_00331821
------------------------------------------
Foreground time interval of the image:
-47.912 -47.848 (delta_t = 0.064 [sec])
Background time interval of the image:
-119.000 -47.912 (delta_t = 71.088 [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 -47.912 sec. to -47.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.091279E-03) )
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.8958718 for 57 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.00000 ( 0 0.156839 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 8.4953e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from -47.912 sec. to -47.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.9118695 for 56 degrees of freedom
Null hypothesis probability = 0.662
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.00000 ( 0 0.172525 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.00436e-09 ) ergs/cm2
Band function
Time interval is from -47.912 sec. to -47.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( 0.00000 2047.20 )
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.9284490 for 55 degrees of freedom
Null hypothesis probability = 0.626
Photon flux (15-150 keV) in 6.4000E-02 sec: 0.00000 ( 0 0.178352 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 9.89677e-10 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.00000 -4.9999 195
R^2/D10^2 : 0.00000 0 1e+24
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.8958718 for 57 degrees of freedom
Null hypothesis probability = 0.696
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 -6.9999 193
Norm : 0.00000 0 1e+24
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.8958718 for 57 degrees of freedom
Null hypothesis probability = 0.696
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 -3.9999 196
R1^2/D10^2 : 0.00000 0 1e+24
kT2 [keV] : 10.0000 -9.9999 190
R2^2/D10^2 : 0.00000 0 1e+24
------------------------------------------------------------
Chi-Squared = 51.06469 using 59 PHA bins.
Reduced chi-squared = 0.9284490 for 55 degrees of freedom
Null hypothesis probability = 0.626
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 -47.912 sec. to -47.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -4.50000 8.50000 )
Norm@50keV : 0.00000 ( 0.00000 1.255525E-03) )
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7653162 for 57 degrees of freedom
Null hypothesis probability = 0.904
Photon flux (15-150 keV) in 8.0000E-02 sec: 0.00000 ( 0 0.19022 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.11752e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -47.912 sec. to -47.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( -4.00000 9.00000 )
Epeak [keV] : 50.0000 ( -49.9900 9950.00 )
Norm@50keV : 0.00000 ( 0.00000 1.000000E+24) )
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7789826 for 56 degrees of freedom
Null hypothesis probability = 0.886
Photon flux (15-150 keV) in 8.0000E-02 sec: 0.00000 ( 0 0.219125 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.37845e-09 ) ergs/cm2
Band function
Time interval is from -47.912 sec. to -47.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.983950 ( -9.01605 5.98395 )
beta : -2.50000 ( -7.50000 12.5000 )
Epeak [keV] : 80.0000 ( -79.9000 9920.00 )
Norm@50keV : 0.00000 ( 0.00000 38512.8 )
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7931460 for 55 degrees of freedom
Null hypothesis probability = 0.865
Photon flux (15-150 keV) in 8.0000E-02 sec: 0.00000 ( 0 0.210659 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 1.84317e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.00000 -4.9999 195
R^2/D10^2 : 0.00000 0 1e+24
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7653162 for 57 degrees of freedom
Null hypothesis probability = 0.904
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 -6.9999 193
Norm : 0.00000 0 1e+24
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7653162 for 57 degrees of freedom
Null hypothesis probability = 0.904
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 -3.9999 196
R1^2/D10^2 : 0.00000 0 1e+24
kT2 [keV] : 10.0000 -9.9999 190
R2^2/D10^2 : 0.00000 0 1e+24
------------------------------------------------------------
Chi-Squared = 43.62303 using 59 PHA bins.
Reduced chi-squared = 0.7931460 for 55 degrees of freedom
Null hypothesis probability = 0.865
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.000e+01 -3.600e+00
25- 50
50-150
15-150
Plot creation:
Tue Oct 21 10:08:02 EDT 2008