[vsolj-alert 118] GRB afterglow for GRB980519

[Atsumasa Yoshida <ayoshida@cricket.riken.go.jp>]

皆様

5月19日 12:20:00 UT に BeppoSAXが、γ線バーストを発見しました。
この可視光対応天体候補を早くも The Nordic Optical Telescope チームが
発見したようです。今回は『比較的』明るかったようです。

以下に関連するメイルを添付いたします。

理化学研究所  吉田篤正

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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  78
SUBJECT: GRB980519 optical observations
DATE:    98/05/20 02:46:49 GMT
FROM:    Jens Hjorth at NORDITA  <jens@nordita.dk>

The Nordic Optical Telescope GRB team (A. O. Jaunsen, J. Hjorth, M. I. Andersen,
K. Kjernsmo, H. Pedersen, E. Palazzi) reports the detection at the 2.5-m NOT of 
an unresolved (in seeing of 1.5"-2"), variable object located within the 
BeppoSAX error box of GRB 980519 (GCN #75). 

The coordinates (+- 0.5") are

RA(2000)  =  23 22 21.46
Dec(2000) = +77 15 43.0

The object had an I magnitude of about 19.5 on May 19.87 UTC but is not
detected in the DSS while objects of similar magnitude are. The OT had 
faded by about 0.6 mag in V and I on May 20.0 UTC. 

These observations suggest that the OT is the optical counterpart of GRB 980519.

Preliminary Cousins I photometry (+-0.1 mag, not corrected for extinction) of 
4 nearby reference stars yields

     RA(2000)       Dec(2000)         I
A    23 22 17.74    +77 15 51.2      19.04
B    23 22 27.29    +77 15 43.5      19.49
C    23 22 28.50    +77 15 25.4      18.52
D    23 22 47.14    +77 16 23.5      15.69

On this system the OT had I=20.08 on May 20.00 UTC

Finding charts, images and updates will be posted at 
http://vsnet.uio.no/~ajaunsen/grb980519

This note can be cited.

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Subject: BeppoSAX GRB: GB980519 updated position
Date: Tue, 19 May 1998 17:35:26 +0000 (GMT)

BeppoSAX GRB MAIL N. 98/16
^^^^^^^^^^^^^^^^^^^^^^^^^^


GB980519

Refined position from the WFC are:


RA(2000)=350.561
Dec(2000)=+77.255

with an error radius of 3'.

This is 2' from the preliminary position.



Luigi Piro
BeppoSAX Mission Scientist



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Subject: BeppoSAX GRB ALERT: GB980519 
Date: Tue, 19 May 1998 15:59:49 +0000 (GMT)



BeppoSAX GRB MAIL N. 98/15
^^^^^^^^^^^^^^^^^^^^^^^^^^


GB980519

GB980519 (BATSE trigger n.6764) has been detected  by the GRBM of BeppoSAX
and by the WFC at about 12:20:00 UT of May 19. 

A preliminary position  by the WFC is

RA(2000)=350.54
Dec(2000)=77.293

with an error radius of 5'.

A BeppoSAX follow up  with the NFI is being planned.


Luigi Piro
BeppoSAX Mission Scientist

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