batgrbproduct Analysis for Trigger=276784
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 Dec 13 18:52:48 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger276784/GCN5_download_cron
======================================================================
Trigger: 00276784 Segment: 000
BAT Trigger Time: 199029864 [s; MET]
Trigger Stop: 199030504 [s; MET]
UTC: 2007-04-23T14:04:22.090840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.901272562351 Dec: 45.7411322969335 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.44
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.44
Flight Position: [ source = BAT ]
RA: 315.901272562351 Dec: 45.7411322969335 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 316.089915268731 Dec: 45.7207644587167 [deg; J2000]
{ 21h 04m 21.6s , +45d 43' 14.8" }
+/- 5.59803450839939 [arcmin] (estimated 90% radius based on SNR)
+/- 4.48026482721205 [arcmin] (formal 1-sigma fit error)
SNR: 2.5971446297161
RA = 21h 4m 21.6s (316.089915 deg.)
Dec = 45d 43' 15" (45.720764 deg.)
Angular difference between Flight and Ground position is 7.994634 arcmin
Partial Coding Fraction: 0.8046875 [ including projection effects ]
Duration
T90: 640 +/-
Measured from: 0
to: 640 [s; relative to TRIGTIME]
T50: 640 +/-
Measured from: 0
to: 640 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 640 second)
Measured from: 0
to: 640 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 640 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.057538 0.038159 0.039033 0.005345
0.030973 0.030921 0.027468 0.024044 [error]
Peak 0.057538 0.038159 0.039033 0.005345
0.030973 0.030921 0.027468 0.024044 [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 7.75e-09 1.88e-08 3.60e-08 1.69e-07 9.75e-08 2.36e-07 erg/cm2
Error 1.07e-08 1.70e-08 3.05e-08 9.27e-07 6.63e-08 9.35e-07 erg/cm2
Peak flux Power-law 7.51e-03 9.83e-03 9.44e-03 1.61e-02 3.21e-02 4.29e-02 ph/cm2/s
Error 1.05e-02 9.08e-03 7.91e-03 6.58e-02 2.26e-02 6.03e-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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 7.49e-03 4.29e-02 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 4.72e-02 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 1.059 2.744 - - 2.78e-04 2.31e-04 43.462 57
CPL 0.975 0.000 528.9 0.0 3.13e-04 0.00e+00 43.493 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.059 2.744 - - 2.78e-04 2.31e-04 43.462 57
CPL 0.975 0.000 528.9 0.0 3.13e-04 0.00e+00 43.493 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 640.000 0.000 640.000
T90 640.000 0.000 640.000
T50 640.000 0.000 640.000
Peak 640.000 0.000 640.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
316.0899 +45.7208 0.0737 29.2 177.8 0.1558 2.6 TRIG_00276784
------------------------------------------
Foreground time interval of the image:
0.000 33.090 (delta_t = 33.090 [sec])
Background time interval of the image:
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.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05918 ( -4.05918 1.42869 )
Norm@50keV : 2.780280E-04 ( -2.780280E-04 1.838730E-04) )
------------------------------------------------------------
Chi-Squared = 43.46194 using 59 PHA bins.
Reduced chi-squared = 0.7624903 for 57 degrees of freedom
Null hypothesis probability = 0.907
Photon flux (15-150 keV) in 33.09 sec: 3.213451E-02 ( -0.0222842 0.0228467 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.75033e-08 ( -6.55258e-08 6.71264e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.975245 ( )
Epeak [keV] : 528.918 ( )
Norm@50keV : 3.125240E-04 ( )
------------------------------------------------------------
Chi-Squared = 43.49251 using 59 PHA bins.
Reduced chi-squared = 0.7766520 for 56 degrees of freedom
Null hypothesis probability = 0.889
Photon flux (15-150 keV) in 33.09 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.804962 ( -9.19504 5.80496 )
beta : -1.06238 ( -8.93762 11.0624 )
Epeak [keV] : 86.0078 ( -85.9078 9913.99 )
Norm@50keV : 4.653296E-04 ( -4.653296E-04 104.449 )
------------------------------------------------------------
Chi-Squared = 43.46098 using 59 PHA bins.
Reduced chi-squared = 0.7901996 for 55 degrees of freedom
Null hypothesis probability = 0.869
Photon flux (15-150 keV) in 33.09 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 33.090 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05918 ( -4.05918 1.42869 )
Norm@50keV : 2.780280E-04 ( -2.780280E-04 1.838730E-04) )
------------------------------------------------------------
Chi-Squared = 43.46194 using 59 PHA bins.
Reduced chi-squared = 0.7624903 for 57 degrees of freedom
Null hypothesis probability = 0.907
Photon flux (15-150 keV) in 33.09 sec: 3.213451E-02 ( -0.0222842 0.0228467 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.75033e-08 ( -6.55258e-08 6.71264e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.975245 ( )
Epeak [keV] : 528.918 ( )
Norm@50keV : 3.125240E-04 ( )
------------------------------------------------------------
Chi-Squared = 43.49251 using 59 PHA bins.
Reduced chi-squared = 0.7766520 for 56 degrees of freedom
Null hypothesis probability = 0.889
Photon flux (15-150 keV) in 33.09 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.090 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.804962 ( -9.19504 5.80496 )
beta : -1.06238 ( -8.93762 11.0624 )
Epeak [keV] : 86.0078 ( -85.9078 9913.99 )
Norm@50keV : 4.653296E-04 ( -4.653296E-04 104.449 )
------------------------------------------------------------
Chi-Squared = 43.46098 using 59 PHA bins.
Reduced chi-squared = 0.7901996 for 55 degrees of freedom
Null hypothesis probability = 0.869
Photon flux (15-150 keV) in 33.09 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Thu Dec 13 18:56:17 EST 2007