Special notes of this burst
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
223.0407 -28.5441 0.0199 37.7504 -93.1662 0.6932722 9.640 TRIG_00435160
Foreground time interval of the image:
-0.296 4.424 (delta_t = 4.720 [sec])
Background time interval of the image:
-239.976 -0.296 (delta_t = 239.680 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 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
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
8 ms binning
From T100_start-3 s to T100_start+3 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
2 ms binning
From T100_start-1 s to T100_start+1 s
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Quad-rate summed light curves (from T0-300s to T0+1000s)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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 average DRM
Power-law model
Time interval is from -0.296 sec. to 4.424 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79600 ( -0.279759 0.292341 )
Norm@50keV : 8.98611E-03 ( -0.00152014 0.00149413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.66 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 57 degrees of freedom
# Null hypothesis probability = 5.253008e-01
Photon flux (15-150 keV) in 4.72 sec: 1.23635 ( -0.203928 0.205207 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90525e-07 ( -6.64633e-08 6.72123e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 4.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36513 ( -1.28689 0.89494 )
Epeak [keV] : 73.3169 ( )
Norm@50keV : 1.48491E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9857 for 56 degrees of freedom
# Null hypothesis probability = 5.052289e-01
Photon flux (15-150 keV) in 4.72 sec: 1.20823 ( -0.215294 0.216 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80093e-07 ( -7.16935e-08 7.17412e-08 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 4.424 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38015 ( -0.619833 0.963397 )
beta : -9.37109 ( 9.37167 19.3717 )
Epeak [keV] : 74.5763 ( -34.2799 -74.5737 )
Norm@50keV : 1.45606E-02 ( -0.00674931 0.00878861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.671483e-01
Photon flux (15-150 keV) in 4.72 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79529e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5494 (-2.70155 3.22524)
R^2/D10^2 : 0.185394 (-0.100914 0.236476)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.14 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.146008e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.402e-08 1.143e-08
25- 50 1.224e-07 3.417e-08
50-150 1.454e-07 4.968e-08
15-150 3.019e-07 8.090e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 112.184 (-47.5483 -111.905)
Norm : 5.28060 (-1.04769 1.43781)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.23 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 57 degrees of freedom
# Null hypothesis probability = 5.419325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.506e-08 1.465e-08
25- 50 1.150e-07 3.443e-08
50-150 1.984e-07 1.265e-07
15-150 3.784e-07 1.632e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.95610 (-2.56188 3.15586)
R1^2/D10^2 : 2.48952 (-1.91586 25.3271)
kT2 [keV] : 21.1643 (-5.89967 15.1551)
R2^2/D10^2 : 2.83653E-02 (-0.0247286 0.0499052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.69 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 55 degrees of freedom
# Null hypothesis probability = 4.865344e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.609e-08 3.835e-08
25- 50 1.121e-07 5.803e-08
50-150 1.996e-07 1.087e-07
15-150 3.778e-07 2.051e-07
Peak spectrum fit
Power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11738 ( -0.361959 0.40695 )
Norm@50keV : 1.52299E-02 ( -0.00378566 0.00356866 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.63 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.024868e-01
Photon flux (15-150 keV) in 1 sec: 2.41681 ( -0.471777 0.473135 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41749e-07 ( -3.06417e-08 3.1245e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97337 ( )
Epeak [keV] : 11.5888 ( )
Norm@50keV : 1.76365E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.81 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 56 degrees of freedom
# Null hypothesis probability = 1.736429e-01
Photon flux (15-150 keV) in 1 sec: 2.41594 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41908e-07 ( -3.1402e-08 3.0662e-08 ) ergs/cm2
Band function
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50774 ( 1.50594 1.50594 )
beta : -2.15352 ( 2.1511 0.395471 )
Epeak [keV] : 21.2092 ( -21.3359 -21.3359 )
Norm@50keV : 4.24366E-02 ( -0.0408118 6.98339e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.63 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 55 degrees of freedom
# Null hypothesis probability = 1.545303e-01
Photon flux (15-150 keV) in 1 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] : 8.61801 (-1.89281 2.51429)
R^2/D10^2 : 1.90875 (-1.21973 3.28195)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.80 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 57 degrees of freedom
# Null hypothesis probability = 5.698710e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.694e-08 1.152e-08
25- 50 5.344e-08 1.988e-08
50-150 1.782e-08 1.045e-08
15-150 9.820e-08 4.116e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.9239 (-27.3837 70.4826)
Norm : 12.3212 (-3.95475 5.97872)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.29 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 57 degrees of freedom
# Null hypothesis probability = 1.654249e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.104e-08 8.100e-09
25- 50 4.747e-08 1.211e-08
50-150 5.470e-08 2.957e-08
15-150 1.332e-07 3.787e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37305 (-1.84305 2.11361)
R1^2/D10^2 : 5.45587 (-3.70062 16.7932)
kT2 [keV] : 32.5681 (-15.0702 122.771)
R2^2/D10^2 : 8.94053E-03 (-0.00856657 0.0435592)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.779745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.336e-08 1.932e-08
25- 50 4.520e-08 2.522e-08
50-150 6.903e-08 4.375e-08
15-150 1.476e-07 7.756e-08
Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)
Power-law model
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79600 ( -0.279759 0.292341 )
Norm@50keV : 8.98611E-03 ( -0.00152014 0.00149413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.66 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 57 degrees of freedom
# Null hypothesis probability = 5.253008e-01
Photon flux (15-150 keV) in 4.72 sec: 1.23635 ( -0.203928 0.205207 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.90525e-07 ( -6.64633e-08 6.72123e-08 ) ergs/cm2
Cutoff power-law model
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36513 ( -1.28689 0.895044 )
Epeak [keV] : 73.3169 ( )
Norm@50keV : 1.48491E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 0.9857 for 56 degrees of freedom
# Null hypothesis probability = 5.052289e-01
Photon flux (15-150 keV) in 4.72 sec: 1.20823 ( -0.215294 0.216 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80093e-07 ( -7.16935e-08 7.17412e-08 ) ergs/cm2
Band function
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.38015 ( -0.619945 0.963434 )
beta : -9.37109 ( 9.37167 19.3717 )
Epeak [keV] : 74.5763 ( -34.2799 -74.5737 )
Norm@50keV : 1.45606E-02 ( -0.00674931 0.00878861 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.20 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 55 degrees of freedom
# Null hypothesis probability = 4.671483e-01
Photon flux (15-150 keV) in 4.72 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79529e-07 ( 0 0 ) ergs/cm2
S(25-50 keV) vs. S(50-100 keV) plot
S(25-50 keV) = 1.10e-07
S(50-100 keV) = 1.26e-07
T90 vs. Hardness ratio plot
T90 = 4.16000002622604 sec.
Hardness ratio (energy fluence ratio) = 1.14545
Color vs. Color plot
Count Ratio (25-50 keV) / (15-25 keV) = 1.16518
Count Ratio (50-100 keV) / (15-25 keV) = 0.877271
Mask shadow pattern
IMX = -4.276569109937540E-02, IMY = 7.731133110912413E-01
TIME vs. PHA plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
TIME vs. DetID plot around the trigger time
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
100 us light curve (15-350 keV)
Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 4.096000
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:
-239.976000 -0.296000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
244.9807 -15.6401 0.2 23.8 -53.5 19.0889 64.5 0.1 Sco X-1
256.0314 -37.8528 2.6 12.4 -131.6 1.0480 4.4 2.2 4U 1700-377
256.4620 -36.5639 5.7 11.3 -128.0 0.4938 2.0 8.5 GX 349+2
262.9601 -24.8325 2.3 5.1 -29.9 1.3442 5.0 5.9 GX 1+4
264.9459 -44.4436 7.4 15.5 -169.2 0.3839 1.6 8.7 4U 1735-44
268.3181 -1.3918 8.4 27.6 11.3 0.3944 1.4 4.7 SW J1753.5-0127
270.3268 -25.1037 1.8 5.2 50.5 1.6617 6.4 2.7 GX 5-1
270.1325 -25.7336 11.5 4.7 54.1 0.2707 1.0 9.2 GRS 1758-258
273.8679 -14.1119 3.3 16.4 33.8 0.8361 3.5 9.2 GX 17+2
275.8055 -30.2931 3.4 8.3 108.6 0.7774 3.4 7.6 H1820-303
285.0174 -24.9097 4.7 17.1 87.7 0.7167 2.4 1.2 HT1900.1-2455
288.7237 10.9681 4.0 45.4 38.7 3.0160 2.9 4.6 GRS 1915+105
263.1712 -33.8457 4.0 5.6 -144.7 0.7088 2.9 9.1 GX 354-0
304.7948 -20.3337 3.1 35.8 92.0 2.5275 3.8 ------ UNKNOWN
291.6036 4.2096 3.7 41.1 47.4 2.2286 3.1 ------ UNKNOWN
276.9072 23.0713 3.1 53.0 19.2 4.9102 3.8 ------ UNKNOWN
260.7846 -7.9141 3.4 21.7 -8.0 0.8955 3.4 ------ UNKNOWN
259.9297 2.5618 2.9 32.1 -5.1 1.1716 3.9 ------ UNKNOWN
254.7720 -15.2594 2.1 17.4 -33.4 1.3418 5.5 ------ UNKNOWN
238.6787 -17.1476 2.6 28.0 -64.1 1.3550 4.4 ------ UNKNOWN
200.5701 -76.0101 2.8 56.2 -157.6 4.5168 4.1 ------ UNKNOWN
UNKNOWN
UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image:
-0.296000 4.424000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
245.1403 -15.4947 0.0 23.7 -52.9 -0.0250 -0.9 12.8 Sco X-1
255.9856 -37.8433 42.5 12.4 -131.5 -0.0065 -0.3 0.1 4U 1700-377
256.4273 -36.4391 523.8 11.2 -127.4 -0.0005 -0.0 1.0 GX 349+2
263.0119 -24.7997 4.9 5.1 -29.3 -0.0539 -2.3 3.3 GX 1+4
264.7456 -44.5926 10.6 15.7 -168.7 0.0260 1.1 8.6 4U 1735-44
268.2582 -1.6150 0.0 27.4 11.2 0.0138 0.5 11.8 SW J1753.5-0127
270.4239 -25.0439 4.0 5.3 50.8 -0.0680 -2.9 7.9 GX 5-1
270.1637 -25.9136 0.0 4.6 55.9 -0.0321 -1.4 12.7 GRS 1758-258
273.8862 -14.2041 0.0 16.3 33.9 -0.0254 -1.0 12.2 GX 17+2
275.7755 -30.4843 4.9 8.3 109.9 -0.0549 -2.4 10.5 H1820-303
285.2247 -24.9747 6.4 17.3 88.1 0.0479 1.8 10.8 HT1900.1-2455
288.7801 10.9892 32.2 45.4 38.8 0.0280 0.4 2.8 GRS 1915+105
262.7931 -33.6990 0.0 5.6 -141.2 0.0277 1.2 12.7 GX 354-0
323.2582 -66.9999 2.1 50.8 162.0 0.4512 5.5 ------ UNKNOWN
244.8260 7.8783 2.2 42.3 -25.6 0.2059 5.1 ------ UNKNOWN
242.3410 12.7093 3.0 47.7 -25.4 0.1884 3.9 ------ UNKNOWN
202.1438 -66.4913 1.9 53.4 -146.4 0.6533 6.1 ------ UNKNOWN
223.0407 -28.5441 1.2 37.8 -93.2 0.6936 9.6 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image:
569.324600 962.107000
# RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name
# [deg] [deg] ['] [deg] [deg] [']
186.4988 -62.9671 7.8 52.8 -146.8 2.5086 1.5 12.6 GX 301-2
244.9743 -15.6430 0.1 21.7 -38.4 36.3166 82.5 0.3 Sco X-1
256.0214 -37.8636 2.7 5.1 -154.0 1.8603 4.3 2.0 4U 1700-377
256.4895 -36.5418 2.2 3.7 -149.8 2.1679 5.2 7.6 GX 349+2
262.9703 -24.6762 1.9 9.4 24.1 2.6176 6.0 4.7 GX 1+4
264.7525 -44.5995 15.2 12.2 159.8 0.3091 0.8 9.0 4U 1735-44
268.2820 -1.3458 7.0 33.2 17.7 0.9272 1.6 8.2 SW J1753.5-0127
270.2904 -25.1044 1.8 12.9 53.8 2.7355 6.3 1.6 GX 5-1
270.1382 -25.7595 18.1 12.4 55.6 0.2764 0.6 8.9 GRS 1758-258
274.0340 -14.0549 4.4 23.7 39.5 1.4044 2.6 2.0 GX 17+2
275.7913 -30.5323 4.6 14.7 83.9 1.0927 2.5 12.1 H1820-303
285.0253 -24.9397 48.3 24.3 77.0 0.1453 0.2 1.3 HT1900.1-2455
262.8164 -33.9908 0.0 3.4 102.7 -0.3888 -0.9 12.7 GX 354-0
319.9488 -58.1420 3.1 47.2 141.2 6.8962 3.8 ------ UNKNOWN
272.3427 9.4346 2.7 44.7 19.4 4.0009 4.3 ------ UNKNOWN
267.9651 8.1644 2.2 42.4 13.7 3.5976 5.2 ------ UNKNOWN
254.7977 -15.2489 2.0 18.4 -12.1 2.4478 5.8 ------ UNKNOWN
244.2718 -12.2512 2.0 24.9 -35.4 2.4867 5.7 ------ UNKNOWN
235.3069 -38.6201 2.0 19.7 -112.1 2.6759 5.9 ------ UNKNOWN
185.5249 -63.3040 2.2 53.2 -147.3 8.9257 5.2 ------ UNKNOWN
222.7737 -0.6993 3.2 47.0 -53.3 7.5822 3.6 ------ UNKNOWN
Plot creation:
Sat May 30 23:46:20 EDT 2015