- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:24:42 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 548927, Seg_Num: 0
GRB_RA: 67.898d {+04h 31m 36s} (J2000),
68.084d {+04h 32m 20s} (current),
67.191d {+04h 28m 46s} (1950)
GRB_DEC: +14.665d {+14d 39' 53"} (J2000),
+14.692d {+14d 41' 32"} (current),
+14.558d {+14d 33' 30"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 7553 [cnts] Image_Peak=812 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 148 E_range: 25-100 keV
BKG_INTEN: 29585 [cnts]
BKG_TIME: 80109.77 SOD {22:15:09.77} UT
BKG_DUR: 8 [sec]
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80124.62 SOD {22:15:24.62} UT
GRB_PHI: -48.09 [deg]
GRB_THETA: 32.59 [deg]
SOLN_STATUS: 0x20000003
RATE_SIGNIF: 59.94 [sigma]
IMAGE_SIGNIF: 20.84 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +2 +7 -5 +0 +17 +0
SUN_POSTN: 330.57d {+22h 02m 17s} -12.02d {-12d 01' 25"}
SUN_DIST: 100.17 [deg] Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN: 45.91d {+03h 03m 37s} +17.51d {+17d 30' 23"}
MOON_DIST: 21.48 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 181.84,-22.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 68.48, -7.14 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This Notice was delayed by more than 60 sec past the end of the trigger integration interval;
COMMENTS: probably due to it occurring during a Malindi downlink session.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 263.72,15.72 [deg].
COMMENTS:
COMMENTS: NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=382745724).
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:15:27 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 46
TRIGGER_NUM: 382745724
GRB_RA: 68.067d {+04h 32m 16s} (J2000),
68.254d {+04h 33m 01s} (current),
67.352d {+04h 29m 25s} (1950)
GRB_DEC: +16.017d {+16d 01' 00"} (J2000),
+16.044d {+16d 02' 38"} (current),
+15.911d {+15d 54' 40"} (1950)
GRB_ERROR: 8.45 [deg radius, statistical plus systematic]
GRB_INTEN: 270 [cnts/sec]
DATA_SIGNIF: 11.40 [sigma]
INTEG_TIME: 1.024 [sec]
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80121.42 SOD {22:15:21.42} UT
GRB_PHI: 102.00 [deg]
GRB_THETA: 70.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO: 1.94
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 82% GRB
2nd_MOST_LIKELY: 13% Generic SGR
DETECTORS: 0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN: 330.57d {+22h 02m 16s} -12.03d {-12d 01' 33"}
SUN_DIST: 100.56 [deg] Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN: 45.83d {+03h 03m 18s} +17.49d {+17d 29' 30"}
MOON_DIST: 21.51 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 180.81,-21.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 68.85, -5.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 251.33,24.67 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:15:32 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 59
TRIGGER_NUM: 382745724
GRB_RA: 64.767d {+04h 19m 04s} (J2000),
64.959d {+04h 19m 50s} (current),
64.034d {+04h 16m 08s} (1950)
GRB_DEC: +20.167d {+20d 10' 00"} (J2000),
+20.198d {+20d 11' 52"} (current),
+20.046d {+20d 02' 47"} (1950)
GRB_ERROR: 7.17 [deg radius, statistical plus systematic]
GRB_INTEN: 500 [cnts/sec]
DATA_SIGNIF: 27.70 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80121.42 SOD {22:15:21.42} UT
GRB_PHI: 100.00 [deg]
GRB_THETA: 65.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 0.71
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 86% GRB
2nd_MOST_LIKELY: 11% GRO_J0422_32
DETECTORS: 0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN: 330.57d {+22h 02m 16s} -12.03d {-12d 01' 33"}
SUN_DIST: 98.18 [deg] Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN: 45.83d {+03h 03m 18s} +17.49d {+17d 29' 30"}
MOON_DIST: 18.30 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 175.24,-20.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 66.41, -1.23 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 251.33,24.67 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:15:36 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 58
TRIGGER_NUM: 382745724
GRB_RA: 69.050d {+04h 36m 12s} (J2000),
69.238d {+04h 36m 57s} (current),
68.334d {+04h 33m 20s} (1950)
GRB_DEC: +16.210d {+16d 12' 36"} (J2000),
+16.236d {+16d 14' 10"} (current),
+16.109d {+16d 06' 32"} (1950)
GRB_ERROR: 2.17 [deg radius, statistical only]
DATA_SIGNIF: 23.30 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80121.42 SOD {22:15:21.42} UT
GRB_PHI: 103.00 [deg]
GRB_THETA: 70.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4143 (Gnd S/W Version number)
SUN_POSTN: 330.57d {+22h 02m 16s} -12.03d {-12d 01' 33"}
SUN_DIST: 101.53 [deg] Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN: 45.83d {+03h 03m 19s} +17.49d {+17d 29' 31"}
MOON_DIST: 22.43 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 181.27,-20.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 69.81, -5.77 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:15:41 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 70
TRIGGER_NUM: 382745724
GRB_RA: 69.090d {+04h 36m 22s} (J2000),
69.278d {+04h 37m 07s} (current),
68.375d {+04h 33m 30s} (1950)
GRB_DEC: +16.140d {+16d 08' 24"} (J2000),
+16.166d {+16d 09' 58"} (current),
+16.039d {+16d 02' 20"} (1950)
GRB_ERROR: 1.50 [deg radius, statistical only]
DATA_SIGNIF: 42.90 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80121.42 SOD {22:15:21.42} UT
GRB_PHI: 103.00 [deg]
GRB_THETA: 70.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4143 (Gnd S/W Version number)
SUN_POSTN: 330.57d {+22h 02m 16s} -12.03d {-12d 01' 33"}
SUN_DIST: 101.55 [deg] Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN: 45.83d {+03h 03m 19s} +17.49d {+17d 29' 31"}
MOON_DIST: 22.47 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 181.35,-20.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 69.84, -5.85 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 16 Feb 13 22:25:21 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 548927, Seg_Num: 0
GRB_RA: 67.898d {+04h 31m 36s} (J2000),
68.084d {+04h 32m 20s} (current),
67.191d {+04h 28m 46s} (1950)
GRB_DEC: +14.665d {+14d 39' 53"} (J2000),
+14.692d {+14d 41' 32"} (current),
+14.558d {+14d 33' 30"} (1950)
GRB_DATE: 16339 TJD; 47 DOY; 13/02/16
GRB_TIME: 80124.62 SOD {22:15:24.62} UT
TRIGGER_INDEX: 148
GRB_PHI: -48.09 [deg]
GRB_THETA: 32.59 [deg]
DELTA_TIME: -43.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 59.94 [sigma]
IMAGE_SIGNIF: 20.84 [sigma]
LC_URL: sw00548927000msb.lc
SUN_POSTN: 330.57d {+22h 02m 17s} -12.02d {-12d 01' 25"}
SUN_DIST: 100.17 [deg] Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN: 45.91d {+03h 03m 39s} +17.51d {+17d 30' 27"}
MOON_DIST: 21.48 [deg]
MOON_ILLUM: 41 [%]
GAL_COORDS: 181.84,-22.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 68.48, -7.14 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 263.72,15.72 [deg].
- GCN Circular #14223
A. Melandri (INAF-OAB), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),
J. R. Cummings (NASA/UMBC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC),
J. A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and
C. A. Swenson (PSU) report on behalf of the Swift Team:
At 22:15:24 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 130216A (trigger=548927). Swift did not slew because
of the Moon observing constraint.
The BAT on-board calculated location is
RA, Dec 67.898, +14.665 which is
RA(J2000) = 04h 31m 36s
Dec(J2000) = +14d 39' 53"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a small precursor
peak at T-6 sec, and then the main peak at T+2 sec
with a total duration of about 20 sec. The peak count rate
was ~10,000 counts/sec (15-350 keV), at ~2 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 13:16 UT on 2013 February 20. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
- GCN Circular #14224
A. Sota (OSN, IAA-CSIC) and A. J. Castro-Tirado (IAA-CSIC),
on behalf of a larger collaboration, report:
"Following the detection of GRB 130216A by Swift (Melandri et al. GCN
Circ. 14223), we are carrying out I-band observations with the 1.5m OSN
telescope at Sierra Nevada Observatory starting 32 min post burst. We do
not find any new or varying optical source within the 3=92 radius Swift/BAT
error cirle down to I about 20. Observations are ongoing.
This message can be quoted.
- GCN Circular #14228
Gendre B. (ARTEMIS/IRAP), Klotz A. (IRAP-CNRS-OMP),
Boer M. (CNRS-ARTEMIS), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 130216A detected by SWIFT (trigger 548927,
Melandri et al., GCN 14223) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 1.96h after the GRB trigger. The elevation of
the field decreased from 44 degrees above horizon and weather conditions
were good.
The date of trigger : t0 = 2013-02-16T22:15:24.620
The first image is trailed with a duration of 180.0s (see the
description in Klotz et al., 2006, A&A 451, L39). We do not detect any
OT with a limiting magnitude of: t0+7048.3s to t0+7228.3s : R > 15.1
The second image is 180.0s exposure in tracking mode: t0+7238.9s to
t0+7418.9s : R > 16.2
We co-added a series of exposures: t0+7238.9s to t0+8399.0s : R > 17.7
Magnitudes were estimated with the nearby USNO-B1 stars and are not
corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=181.8416 lat=-22.2057 and the galactic
extinction in R band is 0.3 magnitudes estimated from D. Schlegel et al.
1998ApJ...500..525S.
This message may be cited.
- GCN Circular #14229
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB),
D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130216A (trigger #548927)
(Melandri, et al., GCN Circ. 14223). The BAT ground-calculated position is
RA, Dec = 67.901, 14.670 deg, which is
RA(J2000) = 04h 31m 36.2s
Dec(J2000) = +14d 40' 10.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 54%.
The mask-weighted light curve shows two peaks. There is an initial small peak
centered on ~T-6 sec with a duration of about 4 sec. The second peak starts
at ~T-3 sec, peaks at ~T+2 sec, and ends at ~T+10 sec.
T90 (15-350 keV) is 6.5 +- 1.1 sec (estimated error including systematics).
The time-averaged spectrum from T-6.16 to T+4.31 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.35 +- 0.04. The fluence in the 15-150 keV band is 3.1 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+1.11 sec in the 15-150 keV band
is 6.5 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/548927/BA/
- GCN Circular #14230
D. A. Perley (Caltech) and S. B. Cenko (UC Berkeley) report:
We imaged the BAT position of GRB 130216A (Melandri et al., GCN 14223;
Barthelmy et al., GCN 14299) on 2013-02-17 (UT) in Ks-band at two
different epochs: 9 one-minute exposures between 02:56 and 03:08
followed by 18 one-minute exposures between 05:46 and 06:13. The FOV
covers the entire BAT error circle.
No new sources are seen in the field relative to the 2MASS catalog.
Digital image subtraction of the two epochs gives a limit on variability
of Ks >~ 18.7 mag (5 sigma) between 4.77 and 7.74 hours after the BAT
trigger.
- GCN Circular #14233
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ),
K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima),
K. Ohta (Kyoto) and N. Kawai(Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 130216A (Melandri et al., GCNC 14223)
with the optical three color (g', Rc and Ic) CCD camera attached
to the Murikabushi 1m telescope of Ishigakijima Astronomical Observatory.
The observation started on 22013-02-17 14:30:07 UT (~16.2 h after the burst).
We did not find any new point source within the refined BAT error circle
(Barthelmy et al., GCNC 14229) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog
for flux calibration.
T0+[day] MID-UT T-EXP[sec] g' Rc Ic
------------------------------------------------------
0.69477 14:55:52 1560.0 >20.1 >19.7 >18.9
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
- GCN Circular #14234
T.D. Staley, R.P. Fender (Univ. of Southampton), A.J. van der Horst,
A. Rowlinson (Univ. of Amsterdam), D.J. Titterington, K.J.B. Grainge
(MRAO) report on behalf of the 4 Pi Sky / AMI team:
"We observed the BAT position of GRB 130216A (Melandri et al., GCN 14223;
Barthelmy et al., GCN 14229) with the AMI Large Array at 15 GHz on
February 16, for one hour starting at 22:28 UT, i.e. 13 minutes after
the burst. The beam FWHM covers the entire BAT error circle.
We detect a source at >10 sigma significance consistent with the
location of the BAT trigger. Further observations are planned to
confirm if this is indeed very early radio emission from GRB 130216A.
These observations were triggered via the system described in
Staley et. al (2013, MNRAS, 428, 3114)."
- GCN Circular #14236
V.Chaplin (UAH) reports on behalf of the Fermi GBM Team:
"At 22:15:21.42 UT on 16 Feb 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 130216A (trigger 382745724 / 130216927),
which was also detected by the Swift/BAT (Melandri et al. 2013, GCN 14223).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 71 degrees.
The GBM light curve consists of two peaks at T0 and T0+4 s,
with a duration (T90) of about 7 s (50-300 keV).
The time-averaged spectrum from T0-0 s to T0+6.7 s is
best fit by a Band function with Epeak = 152 +/- 13 keV,
alpha = -0.7 +/- 0.1, and beta = -2.6 +/- 0.3.
The event fluence (10-1000 keV) in this time interval is
(6.231 +/- 0.255)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+4.5 s in the 10-1000 keV band
is 9.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #14238
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov,
D.Denisenko, A.Sankovich
Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER-VWF robotic telescope (MASTER-Net: http://observ.pereplet.ru) in=20
Kislovodsk was pointed to the GRB130216A 15 sec after notice time and 31=20
sec after GRB time at 2013-02-16 22:15:52.273 UT using FERMI coordinates=20
(V.Chaplin et. al. GCN14236). We observ SWIFT error-box by very wide=20
field cameras (FOV=3D400 sq. deg. d=3D8.2 cm) and haven`t found optical=20
transient on images with 5-sigma upper limit has been about 8 mag.
MASTER II robotic telescope located in Kislovodsk was pointed to the=20
GRB130216A 23 sec after notice time and 582 sec after GRB time at=20
2013-02-16 22:25:06.231 UT. On our first (120s exposure) set we haven`t=20
found optical transient within SWIFT error-box (A. Melandri et. al.=20
GCN14223).
The 5-sigma upper limit has been about 14.0 mag
All =CFbservations were made on high (z>85 deg.) zenith distances and in
bad
weather condition .
The message may be cited.
- GCN Circular #14240
T. Sakamoto (AGU) and S. D. Barthelmy (GSFC) reports on behalf of the Swift-BAT team:
Due to a issue in our automatic pipeline analysis script of the BAT data, we only reported
the result based on a simple power-law fit at the spectral analysis section of the BAT refined
circular (GCN Circ. 14229). However, this GRB had an enough signal-to-noise ratio in
the spectrum to obtain Epeak by the BAT data alone. Therefore, we would like to update the
spectral analysis part of the circular to:
"The time-averaged spectrum from T-6.16 to T+4.31 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 0.80 +- 0.20,
and Epeak of 123.7 +- 27.1 keV (chi squared 47.17 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 3.0 +- 0.1 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T+1.11 sec in the 15-150 keV band is
6.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.35 +- 0.04 (chi squared 72.98 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level. "
We want to thank Alex Kann for pointing this out.
- GCN Circular #14241
T. Sakamoto (AGU) and S. D. Barthelmy (GSFC) reports on behalf of the Swift-BAT team:
Due to a issue in our automatic pipeline analysis script of the BAT data, we only reported
the result based on a simple power-law fit at the spectral analysis section of the BAT refined
circular (GCN Circ. 14229). However, this GRB had an enough signal-to-noise ratio in
the spectrum to obtain Epeak by the BAT data alone. Therefore, we would like to update the
spectral analysis part of the circular to:
"The time-averaged spectrum from T-6.16 to T+4.31 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 0.80 +- 0.20,
and Epeak of 123.7 +- 27.1 keV (chi squared 47.17 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 3.0 +- 0.1 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T+1.11 sec in the 15-150 keV band is
6.5 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.35 +- 0.04 (chi squared 72.98 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level. "
We want to thank Alex Kann for pointing this out.
- GCN Circular #14247
A. Melandri (INAF-OAB) reports on behalf of the Swift team:
We have analysed 8 ks of XRT data for GRB 130216A (Melandri et al.,
GCN Circ. 14223), from 317.7 ks to 347.4 ks after the BAT trigger. The
data are all in Photon Counting (PC) mode. No X-ray afterglow is
detected inside the refined BAT error circle (Sakamoto & Berthelmy,
GCN Circ. 14240). The 3sigma upper limit is of 4.7 x 10^-3 cts/s.
This corresponds to an observed 0.3-10 keV flux of 1.8 x 10^-13 erg/
cm2/s (assuming a typical GRB spectrum with photon spectral index of
2). If we consider the Galactic absorption in this direction (1.5 x
10^21 cm^-2; Kalberla et al. 2005) this corresponds to an unabsorbed
flux of 2.4 x 10^-13 erg/cm2/s.
- GCN Circular #14248
A.J. van der Horst (U. of Amsterdam), R.D.E. Saunders (MRAO),
K.J.B. Grainge (U. of Manchester), R.P. Fender, T.D. Staley
(U. of Southampton), A. Rowlinson, R.A.M.J. Wijers (U. of Amsterdam)
report on behalf of a large collaboration:
"We have observed the Swift/BAT error circle of GRB 130216A (GCN 14229)
at multiple epochs with the AMI Large Array and the Westerbork Synthesis
Radio Telescope, at 15 and 4.8 GHz respectively. The radio source we
reported in GCN 14234 was clearly detected at all epochs at this
position: RA, Dec (J2000) = 04:31:34, +14:39:36 (+/- 2 arcsec).
Our flux density measurements are given in the table below.
Epoch Delta T Freq. Flux density
=========== ====== ===== ============
Feb 16.94-16.98 0.03 days 15 GHz 0.78 +/- 0.08 mJy
Feb 18.55-19.01 1.86 days 15 GHz 0.80 +/- 0.04 mJy
Feb 19.51-19.59 2.62 days 4.8 GHz 1.11 +/- 0.09 mJy
Feb 19.86-19.99 3.00 days 4.8 GHz 1.15 +/- 0.06 mJy
Feb 20.50-20.64 3.64 days 4.8 GHz 0.92 +/- 0.07 mJy
Feb 20.91-20.99 4.02 days 4.8 GHz 1.09 +/- 0.08 mJy
The source is constant in flux between our observing epochs and also
within the 11-hour AMI observation. The spectral index between 4.8
and 15 GHz is -0.3. There is no significant polarization detected
in the combined Westerbork data, with a 3-sigma upper limit of 15%.
From these observations we conclude that this source is not the
counterpart of GRB 130216A, but possibly a radio galaxy or AGN.
Based on the combined 9C and 10C Surveys of Radio Sources
(see, e.g., Davies et al. 2011, MNRAS, 415, 2708), we estimate that
the probability for a source as bright or brighter than the one we
detect to occur by chance inside the Swift/BAT error circle is 2%.
We would like to thank the AMI and WSRT staff for scheduling and
obtaining these observations."
- GCN Circular #14254
F. E. Marshall (NASA/GSFC) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began observations of the field of GRB 130216A
3.67 days after the BAT trigger (Melandri et al., GCN Circ. 14223).
The observations were delayed because of an observing constraint
due to the Moon. No new source is seen inside the refined BAT
error circle (Barthelmy et al. GCN Circ. 14229).
The preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
w1 317224 346946 7959 >22.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.49 in the direction of the burst
(Schlegel et al. 1998).
- GCN Report 421.1
GCN_Report 421.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_421_1.pdf
by A. Melandri
at INAF-OAB
titled: "Swift Observations of GRB 130216A"
Previous IAU Circulars 