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[vsolj-alert 240] GRB990123 and its optical caounterpart candidate
- Date: Sun, 24 Jan 1999 02:49:59 +0900
- To: vsolj-alert@ooruri.kusastro.kyoto-u.ac.jp
- From: Atsumasa Yoshida <ayoshida@crown.riken.go.jp>
- Subject: [vsolj-alert 240] GRB990123 and its optical caounterpart candidate
- Sender: owner-vsolj-alert@ooruri.kusastro.kyoto-u.ac.jp
皆様
BeppoSAXがGRBを検出しました。
また、Palomar 60-inchの観測でかなり明るい可視光対応天体候補が見つかっ
たようです。
ちょうど日本は夜。 でも天気が悪いかなぁ。
関連情報を下にまとめて添付します。
理化学研究所 吉田
########## 1st info #########################################
>From piro@ias.rm.cnr.it Sat Jan 23 22:43:17 1999
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From: Luigi Piro - BeppoSAX Mission Scientist <piro@ias.rm.cnr.it>
To: BEPPOSAX GRB ALERT LIST_1:;; ;;
Subject: BeppoSAX MAIL n. 99/1: ALERT for GB990123 - "The mighty" :)
Date: Fri, 23 Jan 1998 15:36:11 +0000 (GMT)
BeppoSAX MAIL n. 99/1: ALERT for GB990123 - "The mighty" :)
On Jan.23, 9:47:14 UT BeppoSAX GRBM has been triggered by a burst,
GB990123 (also BATSE trigger n.7343), the strongest detected so far
simultaneously with the WFC.
Preliminary coordinates from WFC are:
R.A.(2000)= 231.374
DEC(2000)= +44.754
with an error radius of about 5'
A follow-on with NFI is being planned
Best wishes
Luigi Piro
BeppoSAX Mission Scientist
#----------------------------------#------------------------------------------#
Luigi Piro | E-mail:
Istituto Astrofisica Spaziale | piro@alpha1.ias.rm.cnr.it
C.N.R. | SAX program: saxsci@alpha1.ias.rm.cnr.it
Via Fosso del Cavaliere | phone: -39-06-4993-4007
I-00133 Roma | phone BeppoSAX center: -39-06-4079-6393
Italy | fax(CNR) : -39-06-20660188
#__________________________________#___________________________________________#
########## 2nd info ## Revised position ###################
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From: Luigi Piro - BeppoSAX Mission Scientist <piro@ias.rm.cnr.it>
To: BEPPOSAX GRB ALERT LIST_1:;; ;;
Subject: BeppoSAX MAIL n. 99/2: Refined WFC position of GB990123
Date: Fri, 23 Jan 1998 16:44:19 +0000 (GMT)
BeppoSAX MAIL n. 99/2: Refined WFC position of GB990123
Refined coordinates from WFC are:
R.A.(2000)= 231.369
DEC(2000)= +44.758
i.e. 0.3' away from the preliminary position.
The error radius is 2'
The follow-on with NFI should start around 15:40 UT, i.e. less than
6 hr after the burst
Luigi Piro
BeppoSAX Mission Scientist
#----------------------------------#------------------------------------------#
Luigi Piro | E-mail:
Istituto Astrofisica Spaziale | piro@alpha1.ias.rm.cnr.it
C.N.R. | SAX program: saxsci@alpha1.ias.rm.cnr.it
Via Fosso del Cavaliere | phone: -39-06-4993-4007
I-00133 Roma | phone BeppoSAX center: -39-06-4079-6393
Italy | fax(CNR) : -39-06-20660188
#__________________________________#___________________________________________#
#### Optical observation ################
From: GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>
To: ayoshida@postman.riken.go.jp
Subject: GRB 990123: Bright New Source, Possible Optical Transient
Date: Sat, 23 Jan 1999 12:20:05 -0500 (EST)
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 201
SUBJECT: GRB 990123: Bright New Source, Possible Optical Transient
DATE: 99/01/23 17:18:18 GMT
FROM: Josh Bloom at CIT <jsb@astro.caltech.edu>
GRB 990123: Bright New Source, Possible Optical Transient
S. C. Odewahn, J. S. Bloom, and S. R. Kulkarni (CIT) report on behalf of
the Caltech-NRAO-CARA GRB Collaboration:
"We imaged the BeppoSAX localization (Piro et al. 1999; GCN #199) of GRB
990123 with a CCD camera on the Palomar 60-inch. In each 400-s R-band
image a source clearly brighter than on DSS was seen at position: RA,DEC =
15:25:30.53, +44:46:00.5 (J2000) (preliminary astrometry). This
localization is well-within the BeppoSAX error radius. Though DSS and
R-band are somewhat different bandpasses, given the apparent brightness
of the source relative to the DSS image, we suggest that this source is
the optical transient of GRB 990123.
A faint source at the limit of detectability is seen on the POSS-II
image at this location and we suggest this may is the host galaxy of
the GRB. If true, we have discovered the brightest host galaxy of any
GRB known thus far --- this would be commensurate with the expectation,
based on the high GRB flux as measured by BeppoSAX, that this burst is
nearer than any localized previously.
Preliminary photometry based on the APM catalogue puts the optical
transient at R = 18.2 (Jan 23.565 UT) and the host galaxy at R ~= 21.3.
More precise photometric and astrometric calibrations are currently under
way.
The discovery image may be obtained at the following web page:
http://astro.caltech.edu/~jsb/GRB/grb990123.html
Follow-up of this most bright burst is urged at all wavelengths.
This message may be cited."
#### Radio observation ################
From: GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>
To: ayoshida@postman.riken.go.jp
Subject: GRB 990123, Radio observations
Date: Sat, 23 Jan 1999 11:26:17 -0500 (EST)
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 200
SUBJECT: GRB 990123, Radio observations
DATE: 99/01/23 16:24:28 GMT
FROM: Dale A. Frail at NRAO <dfrail@nrao.edu>
D. A. Frail (NRAO), and S. R. Kulkarni (Caltech) report on behalf of a
larger NRAO/Caltech collaboration:
"We observed the error box of GRB 990123 (GCN #199) beginning January
23.63 UT with the Very Large Array (VLA) at 8.46 GHz. There are no
radio sources brighter than 170 microJy (5-sigma) in the WFC error
circle. Further observations are planned."
This message is citeable.
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