- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Sun 11 Dec 05 22:06:38 UT
NOTICE_TYPE: INTEGRAL Wakeup
TRIGGER_NUM: 2712, Sub_Num: 0
GRB_RA: 345.6499d {+23h 02m 36s} (J2000),
345.7143d {+23h 02m 51s} (current),
345.1095d {+23h 00m 26s} (1950)
GRB_DEC: +55.0701d {+55d 04' 12"} (J2000),
+55.1022d {+55d 06' 08"} (current),
+54.8007d {+54d 48' 03"} (1950)
GRB_ERROR: 3.20 [arcmin, radius, statistical only]
GRB_INTEN: 8.60 [sigma]
GRB_TIME: 79578.38 SOD {22:06:18.38} UT
GRB_DATE: 13715 TJD; 345 DOY; 05/12/11
SC_RA: 2.86 [deg] (J2000)
SC_DEC: 60.45 [deg] (J2000)
SUN_POSTN: 259.10d {+17h 16m 23s} -23.06d {-23d 03' 33"}
SUN_DIST: 106.87 [deg]
MOON_POSTN: 31.73d {+02h 06m 56s} +15.04d {+15d 02' 38"}
MOON_DIST: 53.38 [deg]
GAL_COORDS: 107.71, -4.55 [deg] galactic lon,lat of the burst
ECL_COORDS: 19.45, 53.96 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
COMMENTS: Possibly real GRB event
- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Sun 11 Dec 05 22:09:38 UT
NOTICE_TYPE: INTEGRAL Refined
TRIGGER_NUM: 2712, Sub_Num: 1
GRB_RA: 345.6326d {+23h 02m 32s} (J2000),
345.6970d {+23h 02m 47s} (current),
345.0923d {+23h 00m 22s} (1950)
GRB_DEC: +55.0806d {+55d 04' 50"} (J2000),
+55.1127d {+55d 06' 46"} (current),
+54.8113d {+54d 48' 41"} (1950)
GRB_ERROR: 2.75 [arcmin, radius, statistical only]
GRB_INTEN: 15.16 [sigma]
GRB_TIME: 79601.90 SOD {22:06:41.90} UT
GRB_DATE: 13715 TJD; 345 DOY; 05/12/11
SC_RA: 2.86 [deg] (J2000)
SC_DEC: 60.45 [deg] (J2000)
SUN_POSTN: 259.10d {+17h 16m 23s} -23.06d {-23d 03' 33"}
SUN_DIST: 106.86 [deg]
MOON_POSTN: 31.76d {+02h 07m 02s} +15.06d {+15d 03' 20"}
MOON_DIST: 53.39 [deg]
GAL_COORDS: 107.70, -4.54 [deg] galactic lon,lat of the burst
ECL_COORDS: 19.45, 53.98 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
COMMENTS: Possibly real GRB event
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Sun 11 Dec 05 23:14:14 UT
NOTICE_TYPE: INTEGRAL Offline
TRIGGER_NUM: 2712, Sub_Num: 2
GRB_RA: 345.6878d {+23h 02m 45s} (J2000),
345.7523d {+23h 03m 01s} (current),
345.1472d {+23h 00m 35s} (1950)
GRB_DEC: +55.0788d {+55d 04' 44"} (J2000),
+55.1109d {+55d 06' 39"} (current),
+54.8094d {+54d 48' 34"} (1950)
GRB_ERROR: 2.00 [arcmin, radius, statistical only]
GRB_INTEN: 8.60 [sigma]
GRB_TIME: 79578.38 SOD {22:06:18.38} UT
GRB_DATE: 13715 TJD; 345 DOY; 05/12/11
SC_RA: 2.86 [deg] (J2000)
SC_DEC: 60.45 [deg] (J2000)
SUN_POSTN: 259.15d {+17h 16m 35s} -23.06d {-23d 03' 46"}
SUN_DIST: 106.87 [deg]
MOON_POSTN: 32.33d {+02h 09m 18s} +15.30d {+15d 18' 17"}
MOON_DIST: 53.43 [deg]
GAL_COORDS: 107.73, -4.55 [deg] galactic lon,lat of the burst
ECL_COORDS: 19.49, 53.96 [deg] ecliptic lon,lat of the burst
COMMENTS: INTEGRAL GRB Coordinates.
COMMENTS: refined_coordinates_after_offline_analysis
- GCN Circular #4327
S. Mereghetti (IASF, Milano), D.Gotz (CEA, Saclay), N. Mowlavi, D.Eckert,
M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the
IBAS Localization Team report:
A GRB lasting about 80 s has been detected by IBAS in IBIS/ISGRI
data at 22:05:44 on December 11 2005.
Its refined coordinates (J2000) are:
RA: 345.688 [degrees]
DEC: 55.079 [degrees]
with an uncertainty of 2.0 arcmin (90% c.l. radius).
Its preliminary peak flux (20-200 keV, 1s integration time) is about 0.8
ph (8x10e-8 erg)/cmsq/s. Its fluence (20-200 keV, 80 s integration time)
is 2x10e-6 erg/cmsq.
A plot of the light curve will be posted at
http://ibas.mi.iasf.cnr.it/IBAS_Results.html
This message can be cited.
- GCN Circular #4328
Klotz, A. (CESR-OMP), Boer M. (OHP), and Atteia, J.L. (LAT-OMP) report:
We imaged the entire field of GRB 051211b (trig 2712) detected by INTEGRAL
(Mereghetti et al. GCNC 4327) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France. Observations started 9
seconds after the GCN notice (and 28.7 s after the GRB). The field
had an elevation of 43 degrees above horizon at the begining of the
observations.
The sky was covered by clouds except for only one unfiltered image started on
2005-12-11T22:08:29.51 (GRB+131s) and ended on 2005-12-11T22:08:59.51
(GRB+161s). On this image, we detect a candidate for the afterglow
of the GRB at R ~ 16.2 +/- 0.6 :
RA = 23 02 48.9
DEC = +55 05 06.0
J2000.0
This object is not seen on the DSS2-R, nor on the 2MASS-K, nor
in the USNO-B1.
The image can be seen at
http://www.cesr.fr/~klotz/grb051211b
This message can be cited.
- GCN Circular #4332
C. Pagani (INAF-OAB), D. N. Burrows (PSU), V. Mangano and V. La Parola
(INAF-IASF) report on behalf of the Swift XRT team:
The Swift XRT began observing GRB 051211B, detected by INTEGRAL (Mereghetti
et al., GCN 4327), at 01:05:28 UT on 12 December 2005 (10.8 ks after the
burst). In the first orbit of data (2.4 ks of exposure time), an
uncataloged X-ray source was detected at the following position:
RA,Dec = 345.6762,+55.081 {23:02:42.3, +55:04:51.7} (J2000)
with an uncertainty of 4.5 arcsec radius (90% containment). This position
includes corrections for the XRT boresight. We detected 58 photons from
this source in Photon-Counting mode at a count rate of 0.024 cps,
corresponding to an observed flux of about 1.3x10-12 ergs/cm^2/sec.
The X-ray source is 25 arcsec from the INTEGRAL position (GCN 4327) and 58
arcsec from the candidate optical afterglow reported in GCN 4328. There is
no X-ray source visible at the position of the candidate optical afterglow.
With the data available at this time we cannot determine whether or not
this source is fading. Observations are continuing, and we will report
further results in a later circular.
- GCN Circular #4333
M. Jel=EDnek, A. J. Castro-Tirado, S. Vitek, A. de Ugarte Postigo=20
(IAA-CSIC Granada),
P. Kub=E1nek and R. Hudec (Astronomical Institute of the Academy of=20
Sciences, Ondrejov), report:
The BOOTES instruments in South Spain responded to the two GRBs detected =
on
11 Nov 2005. The BOOTES-2 very wide field camera located at La Mayora=20
(EELM-CSIC, M=E1laga) observed the region of the sky containing the=20
HETE-2/SXC
error box for GRB 051211A (Atteia et al. GCN 4324) as part of the=20
routinary observing schedule. A 30s exposure started at 2:50:00 UT (5s=20
prior to the beginning of the 33s
long burst), i.e. overlaping with the single, hard gamma-ray peak=20
detected by HETE-2. This image sets a R =3D 10 upper limit to the promt=20
optical flash for GRB 051211A.
BOOTES-1 in El Arenosillo (INTA, Huelva), responded under non-optimal=20
conditions to the GRB 051211B trigger (Mereghetti et al. GCNC 4327). A=20
sequence of exposures started at 22:06:34 UT (50s after the GRB onset,=20
30s after the GCN notice), i.e. overlaping for 30 s with the tail of the=20
gamma-ray emission. We do no detect any transient optical emission in=20
the 2' INTEGRAL error box and in particular at the position of the=20
possible afterglow reported by Klotz et al. (GCNC 4328). We set a I > 14=20
limit to any optical emission arising simultaneusly to the gamma-rays.=20
We also notice moderate extinction in the line of sight: E(B-V) =3D 0.47=20
from the Schlegel et al. dust maps (1998)."
This message can be quoted.
- GCN Circular #4334
S. B. Cenko, A. M. Soderberg (Caltech), and D. B. Fox (Penn State) report
on behalf of a larger collaboration:
We have imaged the field of the Integral GRB051211b (Mereghetti et al.,
GCN 4327) with the automated Palomar 60-inch telescope. Observations
consisted of one 120 s exposure in the Kron R and one 120 s exposure in i'
at approximately 12 December 03:20 UT (5.2 hours after the burst).
Further observations were precluded by inclement weather.
By comparison with the Second Digital Sky Survey, we find no new sources
in the Integral error circle to the 3-sigma limits R > 19.0, I > 18.0
(calculated with respect to USNOB R2 and I2 magnitudes). In particular,
we find no objects inside the XRT error circle (Pagani et al., GCN 4332)
or associated with the possible TAROT afterglow (Klotz et al., GCN 4329)
to the same limits.
- GCN Circular #4336
I. Khamitov (TUG), I. Bikmaev, R. Zhuchkov, N. Sakhibullin (KSU/AST)
Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI)
report:
The error box of GRB 051211b (INTEGRAL trig. 2712; Mereghetti et al,
GCN4327) was observed with Russian-Turkish 1.5-m telescope (RTT150,
Bakyrlytepe, TUBITAK National Observatory, Turkey), starting at Dec. 11,
22:23UT, i.e. 18 min after the burst. Observations were started at
zenith distance Z=69 degrees and were continued until the object
descended into the clouds near the horizon.
We made 30x60s exposures in R. The first 20 images were taken in clear
sky but the last 10 images show a variable background because of clouds
and bright Moon. We did not find the afterglow candidate reported by
Klotz et al. (GCN4328) nor on first 60s image nor on image of 20
co-added good images.
At the XRT position (Pagani et al., GCN 4332) we marginally detected
only one source near the detection limit of our combined image. The
coordinates of this source are: 23:02:42.25 +55:04:53.4 (J2000). The
finding chart can be found at:
http://hea.iki.rssi.ru/~rodion/GRB/051211b/r.jpg
Using USNO-B1 stars we estimate limiting magnitude in our combined image
as R=~22.3.
This message may be cited.
- GCN Circular #4337
C. Guidorzi, I.A. Steele, C.J. Mottram, A. Monfardini, C.G. Mundell,
A. Gomboc, R.J. Smith, M.F. Bode (Liverpool JMU) report:
"The 2-m Liverpool Telescope located in La Palma, Canary Islands,
observed GRB051211B detected by INTEGRAL (Mereghetti et al. GCN 4327)
~66 min after the GRB trigger time.
The observation could not commence earlier because of the weather.
The "detection mode" procedure did not detect any obvious candidate
brighter than about r'=16 mag from 3x10-s images.
The limiting magnitude is due to poor sky conditions and bright moonlight.
After visual inspection of a 6-min stacked image started at ~93 min
after the burst, we detect neither the optical candidate found by
Klotz et al. (GCN 4328) nor any counterpart to the X-ray source reported
by Swift/XRT (Pagani et al., GCN 4332), down to r'~18.
The limiting magnitude is automatically calculated with respect to the
USNOB1.0 'R2' values of the field objects."
- GCN Circular #4338
V. La Parola, V. Mangano (INAF-IASF), C. Pagani (INAF-OAB), and D. N.
Burrows (PSU), report on behalf of the Swift XRT team:
The Swift XRT began observing GRB 051211B, detected by INTEGRAL (Mereghetti
et al., GCN 4327), at 01:05:28 UT on 12 December 2005 (10.8 ks after the
burst). With five orbits of data (from 11 ks to 36 ks after the burst),
the uncataloged X-ray source reported in Pagani et al. (GCN 4332) is
clearly fading, consistent with being the afterglow of this burst. Our
updated position is
RA 23:2:41.76, Dec 55:04:51.9 (345.6740, 55.0811),
which is 29".8 from the INTEGRAL position and 62".9 from the position of
the candidate optical afterglow reported in GCN 4328 (Klotz et al.). The
lightcurve is initially flat, with a steep power law decay commencing about
20 ks after the burst. Observations are continuing. Refined analysis,
including decay indices and spectral results, will be issued in a further
circular after accumulation of several more orbits of data.
- GCN Circular #4340
A. J. Blustin (UCL-MSSL), V. La Parola (INAF-IASF), M. Chester (PSU),
L. Angelini (GSFC-JHU), N. Gehrels (GSFC) on behalf of the Swift/UVOT team
The Swift/UVOT began observing the field of GRB 051211b at 01:05:32 on
2005-12-12, ~3 hours after the INTEGRAL trigger (Mereghetti et al.,
GCN 4327). No source was detected at either the XRT (Pagani et al.,
GCN 4332) or Magellan (Klotz et al., GCN 4328) positions in summed
images down to the following 3-sigma upper limits (not corrected for
extinction).
Filter T_range(hours) Exp(s) 3sigUL(mag)
V 3-11.5 7165 21.0
M2 3.25-11.75 7279 21.3
- GCN Circular #4341
A. J. Blustin (UCL-MSSL)
Correction to GCN 4340 (Blustin et al.): No source was detected
at the TAROT (Klotz et al., GCN 4328) position (not Magellan).
- GCN Circular #4343
D. Allen, C. Rodgers, R. Canterna (University of Wyoming) report on behalf
of the Red Buttes Observatory (0.6m) GRB Team as part of the FUN GRB
Collaboration.
We responded to GRB 051211B (INTEGRAL trig. 2712; Mereghetti et al,
GCN4327) at 2005/12/12 00:59:37 UT with two 10 minute I and R exposures
centered on the position of the original INTEFRAL GRB Position under 4.6
arcsecond photometric conditions. The source was not detected in any of
the above exposures in the same position reported by Klotz et al. (GCN
4328) due to detection limits.
UT Time Since Filter Limiting Magnitude
00:59:37 2.8981 hrs I 18.4
01:10:21 3.0769 hrs I 18.4
01:33:40 3.4656 hrs R 19.2
01:44:15 3.6419 hrs R 19.2
10 sigma limiting magnitude were derived from the USNO-B1.0 catalogue.
This message may be cited.
- GCN Circular #4346
E.Sonoda, S.Maeno, M.Yamauchi, Y.Nakamura, S.Masuda
(University of Miyazaki)
"We have observed the field covering the error box of
GRB 051211B (GCN4327) with the unfiltered CCD camera
on the 30-cm telescope at University of Miyazaki.
The observation was started 10:01:06 UT on Dec.12 (about 12 hours after
the burst).
After co-adding a set of 10 images (10:01:06 - 10:13:59 UT)
of 30 sec exposures, we have compared with the USNO A2.0 catalog.
Preliminary analysis shows there is no new source brighter than 17.9 mag.
at the position reported by Klotz, A. et.al.(GCN4328)."
- GCN Circular #4347
V. La Parola, V. Mangano, G. Cusumano (INAF-IASF), C. Pagani (INAF-OAB), and D. N.
Burrows (PSU), D. Hinshaw (GSFC-SPSYS), F. Marshall (GSFC), report on behalf of the Swift XRT team:
We report on further analysis of the XRT observation of GRB051211B (Mereghetti et al., GCN 4327; Pagani et al, GCN 4332; La Parola et al., GCN 4338).
The XRT observation begins 10.8 ksec after the INTEGRAL trigger.
We see a flat phase with a break at 18 ksec from the burst trigger, then the X-ray light-curve decays as a powerlaw with slope -1.16 +/- 0.18.
The spectrum of the PC data can be modelled with an absorbed power-law
with photon index Gamma = 2.0+/-0.3 (90% confidence level).
The absorbing column best fit value is (4.1 +/- 1.3)e21 cm-2, consistent with the Galactic value of 3.3e21 cm-2
The flux at T+24h is 4.4e-13 erg cm^-2 s^-1
- GCN Circular #4350
Dale A. Frail (NRAO) reports on behalf of a larger collaboration:
"We used the Very Large Array to observe the INTEGRAL burst GRB051211B
(GCN4327) at a frequency of 8.46 GHz on 2005 December 14.02 UT. We
find a single weak radio source (66+/-19 uJy) coincident with the
fading X-ray afterglow identified by the XRT (GCN 4338), with an error
of +/-1.3 arcsec in each coordinate.
Further observations are planned.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
- GCN Circular #4358
M. Jel=EDnek, A. de Ugarte Postigo, A.J. Castro-Tirado,=20
V. Casanova, D. Mart=EDnez, S. Guziy, S. Castillo, S. B. Pandey and J. Go=
rosabel (IAA-CSIC Granada):
report:
"We have imaged a 7' x 7' region containing the INTEGRAL error box for GR=
B 051211B (Mereghetti et al. GCNC 4327) with the 1.5-m OSN telescope at t=
he Observatorio de Sierra Nevada, starting on Dec 11.94 UT (i.e. 25 min a=
fter the GRB). A comparison image has been taken on Dec. 15.86 UT. At the=
position of the X-ray afterglow detected by Swift/XRT (La Parola et al. =
GCN 4338) we detect one source that has decreased significantly in bright=
ness in our I-band images. Coordinates yield: RA(2000) =3D 23:02:41.57,=
Dec(2000) =3D +55:04:51.5 (+/-0.4"). This is the likely optical afterglow=
to GRB 051211B. Images are posted at
http://www.iaa.es/~deugarte/GRBs/051211B/GRB051211B.gif .
An underlying object seems to be present on the DDS-2 (infrared) which ma=
y be a bright host galaxy, detected also on our late I-band image. Furthe=
r observations are encouraged."
This message can be quoted.
- GCN Circular #4422
D. Sharapov (MAO, and NOT La Palma), N.Marshalkina, M. Ibrahimov (MAO),
A.Pozanenko (IKI), V.Rumyantsev (CrAO) on behalf of larger GRB follow up
collaboration report:
We observed refined error box of X-ray afterglow detected by Swift/XRT (La
Parola et al. GCN 4338) of GRB051211B (Mereghetti et al. GCN 4327) with 1.5m
telescope of Maidanak Astronomical Observatory on Dec. 12 and Dec.17. Sets
of R images of 10x180 s were accumulated in both epochs. We do not detect
the candidate in afterglow at coordinates RA(J2000) =23:02:41.57, Dec(J2000)
=+55:04:51.5 mentioned by M. Jelinek et al. in GCN 4358. Object to the
North-West from fading object referred in GCN 4358 as a possible host galaxy
is well detected in our combined images in the both epochs. Using USNO-B1.0
catalog we estimate upper limit and possible host galaxy brightness as
following:
Obs. time, Exposure, Galaxy, Mag.(UL),Seeing
(UT) (s) R(mag)
Dec.12 17:16-17:56 1800 21.077+/-0.075 22.0 1.2"
Dec.17 14:09-14:45 1800 21.167+/-0.060 22.3 1.1"
The source mentioned by Khamitov et al in GCN 4336 is marginally detected on
our combined image on Dec.12, and is unlikely to be an afterglow. We would
note that the candidate in afterglow at coordinates RA(J2000) =23:02:41.57,
Dec(J2000) =+55:04:51.5 is well visible in RTT150 image.
Combined images can be found at
http://grb.rssi.ru/GRB051211b/
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