- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 06 Mar 13 23:52:22 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 550457, Seg_Num: 0
GRB_RA: 279.478d {+18h 37m 55s} (J2000),
279.661d {+18h 38m 39s} (current),
278.780d {+18h 35m 07s} (1950)
GRB_DEC: -11.692d {-11d 41' 29"} (J2000),
-11.680d {-11d 40' 45"} (current),
-11.736d {-11d 44' 08"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=1116 [image_cnts]
TRIGGER_DUR: 64.000 [sec]
TRIGGER_INDEX: 20000 E_range: 15-50 keV
BKG_INTEN: 0 [cnts]
BKG_TIME: 0.00 SOD {00:00:00.00} UT
BKG_DUR: 0 [sec]
GRB_DATE: 16357 TJD; 65 DOY; 13/03/06
GRB_TIME: 85861.70 SOD {23:51:01.70} UT
GRB_PHI: -8.86 [deg]
GRB_THETA: 55.89 [deg]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.36 [sigma]
MERIT_PARAMS: +1 +0 +0 +6 +1 +0 -5 +1 -37 +0
SUN_POSTN: 347.64d {+23h 10m 34s} -5.30d {-05d 17' 58"}
SUN_DIST: 67.40 [deg] Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN: 284.69d {+18h 58m 47s} -18.53d {-18d 31' 32"}
MOON_DIST: 8.39 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 20.99, -2.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 279.47, 11.44 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is an image trigger. (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)
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 = 70.14,8.41 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 06 Mar 13 23:55:05 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 550457, Seg_Num: 0
GRB_RA: 279.478d {+18h 37m 55s} (J2000),
279.661d {+18h 38m 39s} (current),
278.780d {+18h 35m 07s} (1950)
GRB_DEC: -11.692d {-11d 41' 29"} (J2000),
-11.680d {-11d 40' 45"} (current),
-11.736d {-11d 44' 08"} (1950)
GRB_DATE: 16357 TJD; 65 DOY; 13/03/06
GRB_TIME: 85861.70 SOD {23:51:01.70} UT
TRIGGER_INDEX: 20000
GRB_PHI: -8.86 [deg]
GRB_THETA: 55.89 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.36 [sigma]
LC_URL: sw00550457000msb.lc
SUN_POSTN: 347.64d {+23h 10m 35s} -5.30d {-05d 17' 56"}
SUN_DIST: 67.40 [deg] Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN: 284.72d {+18h 58m 53s} -18.52d {-18d 31' 17"}
MOON_DIST: 8.41 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 20.99, -2.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 279.47, 11.44 [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 an image 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 = 70.14,8.41 [deg].
- GCN Circular #14266
M. H. Siegel (PSU), B. N. Barlow (PSU), S. D. Barthelmy (GSFC),
N. Gehrels (NASA/GSFC), D. Grupe (PSU), D. Malesani (DARK/NBI),
C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC),
C. J. Mountford (U Leicester), D. M. Palmer (LANL) and
B.-B. Zhang (PSU) report on behalf of the Swift Team:
At 23:51:01 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 130306A (trigger=550457). Swift did not slew because
of a Moon constraint. The BAT on-board calculated location is
RA, Dec 279.478, -11.692 which is
RA(J2000) = 18h 37m 55s
Dec(J2000) = -11d 41' 29"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT real-time TDRSS light curve shows nothing
significant as is typical for image triggers.
Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 05:58 UT on 2013 March 08. There will thus be no XRT or
UVOT data for this trigger before this time.
We note that this burst was strongly detected by Fermi GBM
in a 4.096 second trigger at T-216 seconds (Trigger 384306448) at
a location consistent with the BAT location. Swift was
slewing at the time of the Fermi Trigger, detecting the afterglow
of the GRB in its first 64 second image trigger after the slew ended.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).
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 #14269
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Denisenko, D.Kuvshinov,
N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov,
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 II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Kislovodsk was pointed to the GRB130306A 59 sec after Fermi
trigger num 384306448 at 2013-03-06 23:48:24.313 UT, i.e. 157 sec before
Swift trigger time (Siegel et. al. GCN14266).
The observations started on very high zenith distance about 85 deg.
SWIFT error box (Siegel et. al. GCN14266) got on the edge of our FOV. On
our first (10s exposure) set we haven't found optical transient within
SWIFT error box. The 5-sigma upper limit has been about 13 mag.
Next time we pointed to BAT position at 2013-03-06 23:52:44.60 UT by
SWIFT alert. On our first (20s exposure) set we haven't found optical
transient within SWIFT error-box with upper limit 15.2m. On coadd image
of 8 sets with total exposure 420 sec upper limit is 17.0m (5-sigma).
Galactic extinction in the direction of GRB 130306 is A_R=3.7, A_I=2.7
(from to Schlegel et al., 1998) and A_R=3.0, A_I=2.1 (according to
Schlafly et al., 2011).
The message may be cited.
- GCN Circular #14270
V. Pelassa (UAH) reports on behalf of the Fermi GBM Team:
"At 23:47:25.57 UT on March 6 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 130306A (trigger 384306448 / 130306991),
which was also detected by the Swift/BAT (Siegel et al. 2013, GCN 14266)
The GBM on-ground location is consistent with the Swift position.
The GRB is observed at high angles to all GBM NaI detectors and the angle
from the LAT boresight is 166 degrees.
The GBM light curve consists of 3 main peaks with a duration of about
60 s with a plateau starting about 20 s before trigger and a tail
extending to about 100s after trigger."
- GCN Circular #14275
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The very long-duration GRB 130306A
(Swift-BAT trigger #550457: Siegel et al., GCN 14266;
Fermi-GBM observation: Pelassa, GCN 14270)
triggered Konus-Wind at T0=3D85669.636s UT (23:47:49.636)
The light curve shows a multi-pulse emission which
started ~270 s before the trigger, peaked at ~T0+10s,
and, after ~T0+110s, passed into a long tail
out to ~400 s after the trigger.
The total duration of the burst is ~700 s.
The emission is seen up to 5 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB130306_T85669/
As observed by Konus-Wind, the burst
had a fluence of (2.9 =B1 0.05)x10-4 erg/cm2,
and a 64-ms peak flux, measured from T0+8.768 s,
of (6.1 =B1 0.6)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum
(measured from T0 to T0+116.224 s)
is best fit in the 20 keV - 5 MeV range
by a power law with exponential cutoff model,
for which:
alpha = -1.50 =B1 0.05,
and Ep = 212 =B1 10 keV,
chi2 = 53.8/59 dof.
The spectrum at the maximum count rate
(measured from T0 to T0+11.774 s)
is best fit in the 20 keV - 5 MeV range
by a power law with exponential cutoff model,
for which:
alpha = -1.34 =B1 0.04,
and Ep = 410 =B1 30 keV,
chi2 = 64.7/71 dof.
The spectrum of the emission tail
(measured from T0+116.224 to T0+402.944 s)
is best fit in the 20 keV - 5 MeV range
by the simple power-law model with
the photon index -2.3 =B1 0.1, chi2 =3D 65.1/75 dof.
The emission in this time interval is seen up to 4 MeV
and the 20 keV - 10 MeV energy fluence
is (2.7 =B1 0.3)x10-5 erg/cm2.
All the quoted results are preliminary.
- GCN Circular #14279
S. D. Barthelmy (GSFC), A. Lien (NASA/GSFC/ORAU). T. Sakamoto (GSFC/UMBC),
W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), G. Sato (ISAS), M. H. Siegel (PSU),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-160 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130306A (trigger #550457)
(Siegel, et al., GCN Circ. 14266). The BAT ground-calculated position is
RA, Dec = 279.475, -11.682 deg, which is
RA(J2000) = 18h 37m 54.1s
Dec(J2000) = -11d 40' 55.0"
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 11%.
This burst was already active when it came into the BAT FoV during a slew
at T-160 sec. There were several peaks until ~T-130 sec, then a long
relatively smooth decay out past T+900 sec (when the data ends).
The time-averaged spectrum from T-159.5 to T+154.1 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.95 +- 0.05. The 1-sec peak photon flux (during the period of BAT viewing)
measured from T-152.73 sec in the 15-150 keV band is 7.3 +- 0.8 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/550457/BA/
- GCN Circular #14280
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 130306A (Siegel et al., GCNC 14266)
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 2013-03-07 19:28:07 UT (~19.6 h after the burst).
We did not find any new point source within the refined BAT error circle
(Barthelmy et al., GCNC 14279) in all the three bands.
Three sigma upper limits of the OT are listed below. We used
GSC2.3(for g' and Rc) and USNO-B1(for Ic) catalog for flux calibration.
T0+[day] MID-UT T-EXP[sec] g' Rc Ic
------------------------------------------------------
0.84918 20:13:51 4560.0 >20.6 >19.5 >18.4
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
- GCN Circular #14287
GRB 130306A: Swift Detection of a Possible Afterglow
M. H. Siegel (PSU), David N. Burrows (PSU) and Dirk Grupe (PSU)
report on behalf of the Swift team:
On 8 March 2013 the Swift spacecraft performed a delayed observation of the
BAT-detected burst GRB 130306A (Siegel et al., GCN 14266), which was also
detected by Fermi GBM (Pelassa, GCN 14270) and Konus/Wind (Golenetskii et al.,
GCN 14275).
We have analyzed 5.1 ks of XRT data, from 146 to 163 ks after the Swift/BAT
trigger. The data are entirely in photon counting (PC) mode.
An X-ray source is detected within the Swift/BAT error circle. The XRT
position is RA, Dec = 279.46147, -11.68123 which is equivalent to:
RA (J2000) = 18 37 50.75
Dec(J2000) = -11 40 52.4
with an uncertainty of 4.0 arcsec (radius, 90% confidence). We do not detect
any fading over the time span of the Swift observations.
The Swift/UVOT began settled observations of the field of GRB 130306A 146
ks after the Swift/BAT trigger. No optical afterglow consistent with the XRT position
is detected in the initial UVOT exposures. Preliminary 3-sigma upper limit using the
UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the
initial exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
uvw1 145609 162770 4707 >22.2
The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.15 in the direction of the
burst (Schlegel et al. 1998).
Further observations are planned to determine if the source is fading.
- GCN Circular #14351
M. H. Siegel (PSU) reports on behalf of the Swift team:
Swift performed a follow-up observation of the possible X-ray afterglow of
the BAT-detected GRB 130306A (Siegel et al., GCN Circ. 14287). A 5 ks
observation took place on 14 March 2013, eight days after the burst.
The reported source faded by at least a factor of three, from .009
counts s^-1 (observed flux 4.2 x 10^-13 erg cm^-2 s^-1) to an upper
limit of of .003 counts s^-1 (observed flux 1.5 x 10^-13 erg cm^-2 s^-1).
We therefore confirm that this was the X-ray afterglow of GRB 130306A.
Previous IAU Circulars 