batgrbproduct analysis for trigger=517876

batgrbproduct Analysis for Trigger=517876

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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
4) This page will be updated for up to 10 downlinks after the trigger.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time (local time): Sat Mar 17 04:55:13 EDT 2012
             Host Name: gcn5
   Current Working Dir: /local/data/raid16/prebascript_archive/trigger517876/GCN5_download_cron
======================================================================

  Trigger: 00517876      Segment: 000

  BAT Trigger Time: 353591448   [s; MET]
      Trigger Stop: 353592240   [s; MET]
               UTC: 2012-03-16T11:50:40.001680    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 270.259659475152   Dec: -25.0873139436239  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    13.77
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    13.77

  Flight Position:   [ source = BAT ]
    RA: 270.259659475152   Dec: -25.0873139436239  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 270.337705116417   Dec: -25.1201189891305  [deg; J2000]  
        { 18h 01m 21.0s , -25d 07' 12.4" }
         +/- 4.6049802190189 [arcmin] (estimated 90% radius based on SNR)
         +/- 3.17824217431565 [arcmin] (formal 1-sigma fit error)
    SNR: 3.43281293967697
 
  Angular difference between Flight and Ground position is 4.674967 arcmin
 
  Partial Coding Fraction: 0.9921875    [ including projection effects ]

  Duration
     T90: 0.143999934196472 +/- 0.0312409780678008
        Measured from: 808.088000118732
                   to: 808.232000052929     [s; relative to TRIGTIME]
     T50: 0.0999999642372131 +/- 0.0609261752673085
        Measured from: 808.108000099659
                   to: 808.208000063896     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 807.663999974728     
                   to: 808.663999974728     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 808.083999991417     
                   to: 808.240000009537     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.012000   0.004332   0.001826   0.001527
           0.002208   0.001881   0.001595   0.001354 [error]
 Peak      0.022578   0.004906  -0.001694   0.004676
           0.005352   0.004863   0.004154   0.003591 [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 5.38e-08 1.29e-08 1.59e-09 2.20e-10 6.85e-08 6.85e-08   erg/cm2
              Error 1.71e-08 1.39e-08 4.14e-09 1.61e-09 2.92e-08 2.95e-08   erg/cm2
Peak flux Power-law 5.14e-02 7.12e-03 4.40e-04 2.89e-05 5.90e-02 5.90e-02   ph/cm2/s
              Error 1.60e-02 7.42e-03 1.10e-03 1.91e-04 2.06e-02 2.06e-02   ph/cm2/s
 
Fluence   Cutoff-PL 5.96e-08 7.11e-09 6.42e-09 1.81e-12 2.59e-21 6.71e-08   erg/cm2
              Error 2.04e-08 9.63e-10 0.00e+00 1.75e-08 0.00e+00 0.00e+00   erg/cm2
Peak flux Cutoff-PL 5.74e-02 3.89e-03 4.77e-07 4.07e-16 6.12e-02 6.11e-02   ph/cm2/s
              Error 1.85e-02 6.61e-03 8.41e-04 0.00e+00 1.93e-02 1.95e-02   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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
The chi2 of BB fit is 60.79 which shows a significant improvement in the fit over a PL.
Check the BB fit.
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
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    0.156  808.084  808.240
T90     0.144  808.088  808.232
T50     0.100  808.108  808.208
Peak    1.000  807.664  808.664

Click here for the BAT GCN circular template

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
  270.3377 -25.1201 0.0560   15.9 -143.9       0.2265     3.4  TRIG_00517876       
------------------------------------------
 
Foreground time interval of the image:
  0.000  36.280 (delta_t =  36.280 [sec])
Background time interval of the image:

Lightcurves

Notes:

1) All plots contain as much data as has been downloaded to date.
2) The mask-weighted light curves are using the flight position.
3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
4) 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.
5) 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.
6) 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  808.084 sec. to  808.240 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Cutoff power-law model

Time interval is from  808.084 sec. to  808.240 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file)            
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Band function

Time interval is from  808.084 sec. to  808.240 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file)      
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Single BB

Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Thermal bremsstrahlung (OTTB)

Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Double BB

Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Peak spectrum fit

Power-law model

Time interval is from  807.664 sec. to  808.664 sec.
Usage: bat_spec_fit_sys_xspec12.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Cutoff power-law model

Time interval is from  807.664 sec. to  808.664 sec.
Usage: bat_spec_fit_cutoff_sys_xspec12.sh (pha file) (response file)            
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Band function

Time interval is from  807.664 sec. to  808.664 sec.
Usage: bat_spec_fit_band_sys.sh (pha file) (response file)      
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Single BB

Usage: bat_spec_fit_bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Thermal bremsstrahlung (OTTB)

Usage: bat_spec_fit_brems_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Double BB

Usage: bat_spec_fit_2bb_sys.sh (pha file) (response file)           
       This script tries to add the systematic column to the PHA
       file before doing the fitting

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

Cutoff power-law model

Band function

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.28685e-08
S(50-100 keV) = 1.59162e-09

T90 vs. Hardness ratio plot

T90                                   = 0.143999934196472 sec.
Hardness ratio (energy fluence ratio) = 0.123683

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.361
Count Ratio (50-100 keV) / (15-25 keV) = 0.152167

Mask shadow pattern

IMX = -2.295293357431624E-01, IMY = 1.676113190232283E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-14.699400 36.280000
267.000000 267.690600
301.000000 302.396700
543.000000 543.059000
544.000000 792.400610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.4903 -62.7523    4.8  49.6   22.4   2.0091   2.4    4.7	GX 301-2                      
244.9750 -15.6383    0.2  23.5  136.8  16.6916  55.3    0.3	Sco X-1                       
256.0456 -37.8569    2.1   1.8   22.0   1.3416   5.5    2.9	4U 1700-377                   
256.5269 -36.3671    3.2   0.6   80.8   0.9131   3.6    5.5	GX 349+2                      
262.8400 -24.7774   21.2  12.6 -168.4   0.1495   0.5    9.4	GX 1+4                        
264.5071 -44.5793    0.0   9.8  -43.7   0.0455   0.2   12.7	4U 1735-44                    
268.3473  -1.4075    3.7  36.5 -173.4   1.0950   3.1    3.0	SW J1753.5-0127               
270.2413 -25.1202    1.5  15.8 -144.1   2.1501   7.7    3.4	GX 5-1                        
270.1493 -25.7638    3.4  15.3 -142.7   0.9768   3.5    8.4	GRS 1758-258                  
274.0742 -14.1248    4.1  26.9 -153.9   0.8224   2.9    6.6	GX 17+2                       
275.9454 -30.4860    4.3  16.6 -117.7   0.7103   2.7    7.2	H1820-303                     
284.9334 -24.9140    4.9  26.3 -120.3   0.8069   2.4    5.6	HT1900.1-2455                 
288.7722  10.9625    7.1  55.9 -153.9   2.0763   1.6    1.8	GRS 1915+105                  
262.9887 -33.8352   82.5   5.3 -129.4   0.0372   0.1    0.0	GX 354-0                      
252.4785  15.7660    2.3  52.4  161.9   5.4532   5.1 ------	UNKNOWN                       
283.9980  13.1358    2.8  55.6 -160.2   3.9059   4.1 ------	UNKNOWN                       
309.8439 -73.5715    3.2  45.0  -30.7   1.8428   3.6 ------	UNKNOWN                       
284.7755  14.7416    3.5  57.3 -160.2   4.4870   3.3 ------	UNKNOWN                       
301.9749 -17.1034    3.0  43.8 -116.1   5.2349   3.9 ------	UNKNOWN                       
299.2800  -7.2795    3.1  48.0 -129.0   4.7727   3.7 ------	UNKNOWN

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
0.000000 36.280000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.7296 -62.6791    4.9  49.5   22.5   0.5318   2.3    5.8	GX 301-2                      
244.9772 -15.6381    0.4  23.5  136.8   2.4686  29.8    0.2	Sco X-1                       
256.1690 -37.8868    4.9   1.7   18.8  -0.1468  -2.4    9.0	4U 1700-377                   
256.4177 -36.4205    4.0   0.7   76.0   0.1867   2.9    0.9	GX 349+2                      
262.8586 -24.6716    7.9  12.7 -168.5   0.1015   1.5    9.3	GX 1+4                        
264.7522 -44.4337   28.5   9.8  -45.0  -0.0256  -0.4    1.1	4U 1735-44                    
268.3379  -1.3267    4.3  36.5 -173.4   0.2518   2.7    7.8	SW J1753.5-0127               
270.3345 -25.1152    3.7  15.9 -143.9   0.2111   3.2    3.5	GX 5-1                        
270.1462 -25.6623   22.5  15.3 -143.0   0.0361   0.5    9.7	GRS 1758-258                  
274.0241 -14.1870    6.2  26.8 -153.9   0.1360   1.9    9.1	GX 17+2                       
275.9825 -30.5148   22.4  16.6 -117.5   0.0375   0.5    9.4	H1820-303                     
285.0152 -25.0589    7.4  26.3 -120.0   0.1306   1.6    8.4	HT1900.1-2455                 
288.7843  10.9226 1543.5  55.8 -153.9   0.0021   0.0    1.6	GRS 1915+105                  
262.9962 -33.8347  115.5   5.3 -129.4  -0.0068  -0.1    0.4	GX 354-0                      
253.1003 -52.1096    2.6  16.0   -2.8   0.2883   4.4 ------	UNKNOWN                       
279.3604   2.0825    2.7  43.6 -159.2   0.4940   4.3 ------	UNKNOWN                       
308.5975 -85.5302    3.2  50.9  -16.7   0.5573   3.6 ------	UNKNOWN                       
301.2566 -35.8055    2.7  35.2  -89.7   0.6400   4.3 ------	UNKNOWN                       
305.8777 -28.9138    3.9  41.1  -98.2   0.9296   3.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
878.100670 963.080200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
270.3792 -25.5654    3.2  48.4  136.9   2.7570   3.6   11.4	GRS 1758-258                  
275.8756 -30.2753   15.4  41.8  134.5   0.3468   0.8    6.1	H1820-303                     
284.9599 -25.1239    0.0  37.5  147.9   0.2798   1.1   12.9	HT1900.1-2455                 
314.5501 -66.0904    2.7  26.9   57.9   0.8125   4.3 ------	UNKNOWN                       
303.0083  14.6019    3.1  58.8 -159.3   3.4893   3.8 ------	UNKNOWN

Plot creation:
Sat Mar 17 05:07:12 EDT 2012