GRB 000620
GCN Circular 750
Subject
GRB000620, Radio Observations
Date
2000-07-14T23:38:55Z (25 years ago)
From
Edo Berger at Caltech <ejb@astro.caltech.edu>
E. Berger (Caltech), D. A. Frail (NRAO), and K. Becker (Oberlin) report on
behalf of a larger collaboration:
"We have observed the BeppoSax error circle for GRB000620 (GCN #718)
using the VLA on several occasions starting on June 20.93 UT.
Observations at 4.86 and 8.46 GHz revealed only one uncatalogued source
inside the combined BeppoSax+IPN error region (GCN #723). The position
of the source is RA: 07:34:52.9, DEC: 69:09:07.8 with a conservative
1" error in both. We observed this source on six different days,
ending 19 days after the burst. There is no evidence that the source
is varying substantially at either frequency. We therefore conclude
that it is unlikely that this source is the radio afterglow of
GRB000620."
This message may be cited.
GCN Circular 734
Subject
GRB 000620, optical observations
Date
2000-06-30T15:02:17Z (25 years ago)
From
Javier Gorosabel at LAEFF-INTA, Madrid <jgu@laeff.esa.es>
J. Gorosabel (DSRI, Copenhagen),
A. Henden (USRA/USNO) on behalf of the USNO GRB team,
A.J. Castro-Tirado (LAEFF-INTA, Madrid, and IAA-CSIC, Granada),
P. Gutierrez (IAA-CSIC, Granada),
S. Klose (Thueringer Landessternwarte, Tautenburg),
J. Greiner (AIP, Potsdam),
J.M. Castro Ceron (ROA, San Fernando),
E. Costa and M. Feroci, on behalf of the BSAX team (IAS, Rome),
report on behalf of a larger European collaboration:
"We have obtained R-band images of the GRB 000620 field (GCN #716,
#722) with the 1.0-m USNO and 2.2-m CAHA telescopes, as follows:
Date(UT) T-T0(hr) Exp.(s) Seeing(") Lim. Mag.
-------------------------------------------------------------
20.465 -- 20.472 5.67 2x300 3.0" 19.8
20.898 -- 20.905 16.08 600 2.0" 21.7
21.872 -- 21.879 27.45 600 1.5" 22.1
22.869 -- 22.885 63.49 3x600 1.5" 22.8
-------------------------------------------------------------
No object within the BSAX WFC error box brighter than R ~ 19.5
is found to exhibit a variation larger than 0.25 mag."
This message is citable.
GCN Circular 729
Subject
GRB 000620: J-band observations
Date
2000-06-23T13:00:40Z (25 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <angelo@quasar.mporzio.astro.it>
A. Di Paola, L.A. Antonelli, R. Speziali, Osservatorio Astronomico di Roma,
Italy, A. Arkarov, V. Larionov, Pulkovo Astronomical Observatory, Russia,
M. Dolci, Osservatorio Astronomico di Teramo, on behalf of a larger
collaboration report:
On June 20.86 U.T. and on June 21.83 U.T. we imaged the BeppoSAX
error-box of GRB000620 (GCN #718) using the AZT-24 1.1-meter
telescope at Campo Imperatore (AQ). We obtained two mosaics of J-band
images for a total exposure time of 1500 s in each mosaic.
The limiting mag reached in the 2'.6x2'.6 central part of both mosaics
is J=20.5 mag down to J=19.5 mag on the border and seeing has been
around 2.5 arcsec during both observations.
A comparison of the two observations does not reveal any new or variable
object within the BeppoSAX+IPN error box (GCNs #718, #723).
This message is citable.
GCN Circular 728
Subject
GRB000620, optical observations
Date
2000-06-22T11:08:20Z (25 years ago)
From
Nicola Masetti at ITeSRE,CNR,Bologna <masetti@tesre.bo.cnr.it>
N. Masetti, E. Palazzi, E. Pian, F. Frontera (ITESRE, CNR, Bologna),
M. Tichy, J. Ticha (Klet Observatory), R. Hudec (ASU, Ondrejov) and
G. Gandolfi (IAS, CNR, Rome), on behalf of a larger collaboration,
report:
"Unfiltered optical images of the field of GRB000620 (GCN #716), were
acquired on 2000 June 20.91 with the 0.57-meter telescope (+CCD camera
SBIG ST-8) of the Klet Observatory, Czech Republic, for a total exposure
time of 600 sec. The seeing was around 3 arcsec as the field can only be
observed at high airmass (~2.5) in this period.
No new or noticeable object down to a magnitude ~20 is detected inside
the BeppoSAX+IPN error box (GCNs #718, #723) when we compare our image
with the DSS-II Digital Sky Survey.".
This message can be cited.
GCN Circular 725
Subject
GRB000620 - Optical observations
Date
2000-06-21T12:03:06Z (25 years ago)
From
Gaetano Valentini at Obs. Astro. di Teramo <gaetano@astrte.te.astro.it>
Guidubaldi D., Valentini G., Osservatorio Astronomico di Collurania
Teramo - Italy, report:
Starting at June 20.86, the 4'x4' center field of the BeppoSAX
error-box (GCN 718) was imaged in poor seeing condition using the
TNT 0.72 meter optical telescope at Teramo.
We obtained two 600 sec R-band images. The reached limit magnitude
of the combined one is about R= 19.
Neither the single images, nor the summed one, reveals any variable or
new source when compared with the Digital Sky Survey (DSS-II).
Further observations are planned.
This message can be cited.
GCN Circular 724
Subject
GRB000620 Optical observations
Date
2000-06-20T22:36:54Z (25 years ago)
From
Adriano Guarnieri at O.A.di Bologna <adriano@astbo3.bo.astro.it>
C.Bartolini, R.Gualandi, A.Guarnieri, A.Piccioni, Astronomy Department,
Bologna University and Bologna Astronomical Observatory, and E. Palazzi,
E. Pian, N.Masetti, ITeSRE-CNR, Bologna report:
"On June 20.88 UT we have imaged the field of GRB000620 (G.Gandolfi
et al. GCN n.718) with the 152 cm telescope of Loiano, R color (1800 sec.
exposure). A preliminary quick inspection of the field does not show any
obvious object brighter than POSS1".
This message may be cited
GCN Circular 723
Subject
IPN annulus for GRB000620
Date
2000-06-20T20:30:19Z (25 years ago)
From
Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu>
K. Hurley, on behalf of the Ulysses GRB team, T. Cline, E. Mazets, and
S. Golenetskii, on behalf of the Konus Wind GRB team, and F. Frontera,
C. Guidorzi, and E. Montanari, on behalf of the BeppoSAX GRBM team,
report:
This burst (GCN 722) was detected by Ulysses, Konus Wind, and the
BeppoSAX GRBM. We have triangulated it to an annulus centered at
RA(2000)=312.137 o, Decl(2000)=+32.151 o, with radius 77.784 +/- 0.043
degrees (3 sigma). This annulus intersects the BeppoSAX WFC error
circle to form an ~28 sq. arcmin. error region, reducing the area of
the error circle by ~25%. A map may be found at
ssl.berkeley.edu/ipn3/000620. This annulus may be improved.
GCN Circular 722
Subject
GRB000620: BeppoSAX WFC and GRBM detection
Date
2000-06-20T18:00:23Z (25 years ago)
From
Giangiacomo Gandolfi at IAS/CNR Frascati <gandolfi@ias.rm.cnr.it>
G. Tassone, M.R Daniele, A. Paolino, Scientific Operation Centre,
Telespazio, Roma, M.J.S. Smith, J. in't Zand, Space Research
Organization of the Netherlands (SRON), Utrecht, F. Frontera, C. Guidorzi,
E. Montanari, Universita' di Ferrara, Ferrara, L. Amati, TESRE/CNR,
Bologna, G. Gandolfi, M. Feroci and L.Piro, IAS/CNR, Roma, report:
"The BeppoSAX Gamma Ray Burst Monitor (GRBM) and Wide Field Camera
(WFC unit 2) observed a gamma-ray burst on June 20.23169 UT.
A preliminary analysis reveals a duration of about 15 s in the GRBM,
with a peak photon countrate of 934 cts/s in the 40-700 keV energy
band. In the WFC, the duration is about 20 s and the peak flux is
2.8 Crab (2-26 keV). The position of the X-ray counterpart is
R.A.= 7h 35m 17.2s Decl.= +69d 11' 35" (equinox 2000.0) with a 99%
error radius of 3.6'. A follow-up NFI observation could not be performed
due to solar constraints."
GCN Circular 718
Subject
GRB000620: refined BeppoSAX/WFC coordinates
Date
2000-06-20T12:03:22Z (25 years ago)
From
Giangiacomo Gandolfi at IAS/CNR Frascati <gandolfi@ias.rm.cnr.it>
Refined coordinates of GRB000620 from WFC are:
R.A.(2000)= 113.821
DEC.(2000)= 69.193
The error radius is 3.6'.
G. Gandolfi
on behalf of BeppoSAX Mission Scientist
GCN Circular 717
Subject
BeppoSAX ALERT: GRB000620
Date
2000-06-20T10:18:14Z (25 years ago)
From
Luigi Piro at IAS/CNR Frascati <piro@ias.rm.cnr.it>
BeppoSAX: GRB000620
On June 20, 5:33:38 U.T. a GRB (GRB000620) has been detected simultaneosly
by the GRBM and WFC aboard BeppoSAX.
Preliminary coordinates from WFC are:
R.A.(2000)= 113.872
DEC(2000)= +69.199
The error radius at this stage of analysis is 5'.
Luigi Piro
BeppoSAX Mission Scientist
GCN Circular 716
Subject
GRB000620: BeppoSAX Alert
Date
2000-06-20T09:58:04Z (25 years ago)
From
Giangiacomo Gandolfi at IAS/CNR Frascati <gandolfi@ias.rm.cnr.it>
On June 20, 05:33:38 U.T. a GRB (GRB000620) has been detected
simultaneosly by the GRBM and WFC aboard BeppoSAX.
Preliminary coordinates from WFC are:
R.A.(2000)= 113.872
DEC(2000)= +69.199
The error radius at this stage of analysis is 5'.
We cannot perform a follow up due to solar constraints
Luigi Piro
BeppoSAX Mission Scientist