GRB 010220
GCN Circular 952
Subject
BeppoSAX ALERT: GRB010220
Date
2001-02-21T04:16:00Z (24 years ago)
From
Luigi Piro at IAS/CNR Frascati <piro@ias.rm.cnr.it>
On Feb. 20, 22:51:07 U.T. a GRB (GRB010220) has been
detected simultaneously by the GRBM and WFC2 aboard BeppoSAX.
Preliminary coordinates from WFC are:
R.A.(2000)= 39.4
DEC.(2000)= 61.708
The error radius at this stage of analysis is 6'.
We are planning a BeppoSAX-NFI observation.
L. Piro
BeppoSAX Mission Scientist
GCN Circular 953
Subject
BeppoSAX GRB010220: refined position
Date
2001-02-21T05:55:40Z (24 years ago)
From
Luigi Piro at IAS/CNR Frascati <piro@ias.rm.cnr.it>
Refined coordinates of GRB010210 from BeppoSAX/WFC are:
R.A.(2000)= 39.246
DEC.(2000)= 61.766
The error radius at this stage of analysis is 4'.
L. Piro
BeppoSAX Mission Scientist
GCN Circular 956
Subject
GRB010220: BeppoSAX WFC and GRBM preliminary data
Date
2001-02-21T18:46:06Z (24 years ago)
From
Marco Feroci at IAS/CNR Frascati <feroci@ias.rm.cnr.it>
R. Manzo, BeppoSAX Science Operation Center (SOC), Telespazio, Rome
R. G. Kaptein, SOC and Space Research Organization Netherlands
(SRON), Utrecht, and J.J.M. in' t Zand, Astronomical Institute, Utrecht
University and SRON, L. Piro, M. Feroci, G. Gandolfi, P. Soffitta and
E. Costa, Istituto di Astrofisica Spaziale del CNR, Rome, F. Frontera and
C. Guidorzi, Universita' di Ferrara, Ferrara and L. Amati, Istituto di
Tecnologia e Studio delle Radiazioni Extraterrestri del CNR, Bologna.
"The BeppoSAX Gamma Ray Burst Monitor (GRBM) and the Wide Field Camera
(WFC) unit 2 observed the GRB 010220 on February 20.952164 UT (GCN 952).
The event detected by the GRBM shows a single pulse with a time duration
of 40 s and a peak count rate of about 660 cts/s in the 40-700 keV
energy band. In the WFC, the duration is about 150 s and the peak flux is
0.7 Crab (2-26 keV). The centroid position of the X-ray counterpart from
the WFC image is R.A. = 2h36m59s, Dec = 61o46'.0 (equinox 2000.0) with
an error radius of 4' that includes uncertainties due to a non-optimum
attitude control configuration (GCN 953).
A follow-up observation with BeppoSAX narrow-field instrument is in
progress."
GCN Circular 957
Subject
GRB 010220, simultaneous optical observations
Date
2001-02-21T22:56:04Z (24 years ago)
Edited On
2024-11-06T18:59:14Z (8 months ago)
From
Alberto Castro-Tirado at LAEFF-INTA <ajct@laeff.esa.es>
Edited By
Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
GRB 010220, simultaneous optical observations by BOOTES-1
---------------------------------------------------------
Alberto Castro-Tirado, IAA-CSIC (Granada) and LAEFF-INTA (Madrid)
José María Castro Cerón, ROA (San Fernando)
Tomás Mateo, CEDEA-INTA (Arenosillo)
René Hudec and Jan Soldán, ASU (Ondrejov)
Petr Páta and Martin Bernas, CVUT-FEL (Prague)
José Ángel Berná, Univ. de Alicante (Alicante)
Javier Gorosabel, DSRI (Copenhagen)
Benito de la Morena, CEDEA-INTA (Arenosillo)
José Torres, DEC-INTA (Madrid)
on behalf of the BOOTES-1 Team
report:
"We have obtained about 30 images of a field containing the BSAX/WFC
error box for the 150 s long GRB 010220 (Piro et al. GCN 953, Manzo et al.
GCN 956) with the ultra wide-field CCD of BOOTES-1 during the time interval
Feb 20.93-Feb 20.97 UT (+/- 0.5 h around the GRB occurrence). The exposures,
with integration time of 60 s, cover a field of 40 x 28 deg� and reach a
limiting magnitude of about R = 10. None of the frames, including the one
ending at 22:51:15 UT, i.e. covering the first 8 s of the event, reveals an
optical transient within the BSAX/WFC error circle. The next frame started
at 22:52:15 UT and covers the time interval t_0 + 68 s to t_0 + 128 s.
We notice that the galactic nebula IC 1805 lies along the line of sight of
the GRB, at a galactic latitude of b = +1.38 deg, i.e. the extinction
is high (A_v = 3.3 mag). Images and additional information can be found
at http://www.LAEFF.ESA.Es/~ajct/GRBs/GRB010220/ .
This message can be cited."
[GCN OPS NOTE(12Mar01): Two typos have been corrected.
The phrase "GCN 957) with the" has been changed to "GCN 956) with the".
And "Feb 21.93-Feb 21.97 UT" has been changed to "Feb 20.93-Feb 20.97 UT".]
GCN Circular 958
Subject
GRB010220, Radio and Optical Observations
Date
2001-02-22T09:26:26Z (24 years ago)
From
Edo Berger at Caltech <ejb@astro.caltech.edu>
E. Berger (Caltech), D. A. Frail (NRAO), P. A. Price , J. S. Bloom, T. J.
Galama (Caltech), R. Kudritzki (IFA), and F. Bresolin (ESO) report on
behalf of a larger collaboration:
"Beginning on February 22.21 UT we observed the entire BeppoSAX error
circle of GRB010220 (GCN#953) with the VLA at 4.86 and 8.46 GHz. Inside
this region we detect one weak source (6.5 sigma), which is not cataloged
in the NRAO VLA Sky Survey (NVSS), at RA=02:36:52.1, DEC=61:43:49.1, with
a conservative error of 0.3" in each. The detected source is clearly seen
in the 4.86 GHz image, but it is only marginally detected at 8.46 GHz (~ 4
sigma). We also detect several sources which correspond to cataloged NVSS
sources. We note that the uncataloged source is at the detection
threshold of NVSS. Further observations at the VLA are planned.
In addition, R. Kudritzki and F. Bresolin obtained a single I- (100 s) and
R-band (300 s) exposure using the Low-Resolution Imaging Spectrometer
(LRIS; Oke et al. 1995) on both nights (21.313 and 22.293 Feb 2001 UT).
Using ~200 tie stars from the USNO A2.0 catalogue, an astrometric plate
solution was obtained for the Keck images. No object is present at either
epoch and either filter at the position of the radio source. There is a
very bright star ~12 arcsec to the southwest of the radio position. We
preliminarily estimate the 3-sigma upper-limit to be R ~ 23.5 mag using an
unsaturated star common to the USNO-A2.0 and the R-band image of the
second night. Given the proximity to the Galactic plane, infrared
observations are encouraged."
This message may be cited.
GCN Circular 979
Subject
GRB 010220: Near-IR Observations
Date
2001-02-23T13:39:35Z (24 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <angelo@coma.mporzio.astro.it>
G. Li Causi, A. Di Paola, L.A. Antonelli, S. Puccetti, Osservatorio
Astronomico di Roma, Italy, G. Valentini, Osservatorio Astronomico
di Teramo, Italy, on behalf of a larger collaboration report:
"On Feb. 21 and Feb. 22 we observed the WFC error circle of GRB 010220
(Piro, GCN #953 and Manzo et al. GCN #956) in J and K band with the
AZT-24 1.1-meter telescope at Campo Imperatore (AQ).
At a preliminary investigation of the images we do not find any
obvious candidate for the GRB 010220 afterglow. The limiting
magnitudes reached in the four observations are reported in the
table below:
Date
Band Feb 2001(UT) Lim.Mag. Texp(s) S/N
===========================================
J 21.8841 18.4+/-0.2 2700 3
K 21.9258 17.5+/-0.2 3000 3
K 22.7627 17.1+/-0.2 2200 3
J 22.7990 18.6+/-0.2 2700 3
Due to the contamination from the nearby bright star we are not able
to detect any object at the radio position quoted by Berger et al.,
GCN #958.
The Feb. 21 K-band image is posted at
http://argos.mporzio.astro.it/angelo/grb010220/
This message is citable."
GCN Circular 981
Subject
GRB010220, Optical Observations
Date
2001-02-23T20:23:40Z (24 years ago)
From
Grant Williams at Steward Observatory <ggwilli@compton.as.arizona.edu>
G. G. Williams, R. Uglesich, Mike Bradshaw (Steward Observatory), H. S.
Park (LLNL), D. H. Hartmann (Clemson University) report on behalf of the
LOTIS collaboration.
We observed the BeppoSAX error box of GRB010220 (GCNs 953, 956) with the
0.6-m Super-LOTIS telescope between Feb. 21.223 and Feb. 21.262 or 6.50 to
7.45 hours after the burst. Comparison between the sum of 11 unfiltered
images (total time of t~1360 s) and the DSS-II red scan revealed no
candidate optical counterpart brighter than m~20.2. Image subtraction
between the first and second half of the observations revealed no new
variable source within the error box.
Additional images obtained beginning Feb 22.16 (28.95 hours after the
burst) also reveal no counterpart, however the analysis is still in
progress.
This message may be cited.
GCN Circular 1001
Subject
GRB010220 optical obsercations
Date
2001-03-02T08:30:50Z (24 years ago)
From
Stefano Covino at Brera Astronomical Observatory <covino@merate.mi.astro.it>
D. Fugazza (Brera Astronomical Observatory), A. Moitinho, H. Plana, S.
Monrroy (Observatorio Astronomico Nacional, Mexico), S. Covino, G.
Ghisellini (Brera Astronomical Observatory)
We have observed the error box of GRB010220 (GCN 953) with the 0.84m
telescope of the Observatorio Astronomico Nacional at San Pedro Martir
(Mexico) equipped with the SITE CCD on 22 Feb at 3:00 UT (28.15 hours
after the burst).
We obtained three 120sec exposures in the R band and 8 120sec exposures
in the
B band.
No obvious counterpart has been detected and no sources lay at the
position of the radio source reported by Berger et al. (GCN 958). The
position however is very close to a bright star that may hidden any
faint object.
By unsaturated stars common to the USNO-A2.0 we estimate the 3-sigma B
and R upper limits at ~23.
This message may be cited
GCN Circular 1025
Subject
GRB010220, field photometry
Date
2001-03-28T19:12:57Z (24 years ago)
From
Arne A. Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:
We have acquired shallow BVRcIc all-sky photometry for
an 11x11 arcmin field that covers the BeppoSAX
error circle for GRB010220 (GCN 956) with the USNOFS 1.0-m telescope
on one marginally photometric night. Stars brighter than
V=13 are saturated and should be used with care.
We have placed the photometric data on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb010220.dat
The current photometry has a potential external zero-point
error of about three percent. The astrometry in this file
is based on linear plate solutions with respect to USNO-A2.0.
The internal errors are less than 100mas. Crowding will
yield some unphysical stars due to astrometric and photometric
blends.
Further calibration of this field will not be performed this
season as the field is disappearing into twilight.