To All BACODINE Sites:                                       17 Feb 95

Attached below is an example of a new capability of BACODINE.  BACODINE
will be distributing the GRB localizations determined by the Interplanetary
Network (IPN).  Kevin Hurley is the PI for the IPN operation.

Since IPN localizations depend on the Ulysses spacecraft (and the GRO-BATSE
instrument), the time delays between the GRB and these notices will be
in the 1 to 3 day time range.  Clearly, this is much different than
the "few seconds" delays of the BATSE-only BACODINE notices, but the 
idea is to provide a more global service within the BACODINE network
of sites and operations.  This service will allow for a more speedy analysis
of the appropriate sub-region in observations made by wide FOV instruments.
Also, the already existing BACODINE distribution network will allow for
more timely follow-up observations by instruments that have small FOVs
(comparable to IPN arc segments).  And in late '96, the IPN network
be able to produce small boxes, instead of annuli or annuli segments, when
the Russian Mars 96 spacecraft comes online.

The format of the BACODINE/IPN notices will be:
(1) A header of the pertinant numbers (BACODINE email notice style)
suitable for easy parsing by programs.  The BACODINE and HUNTSVILLE
locations of the GRB are given along with the angular distance between the two.
The Huntsville location is preliminary and may differ slightly from the "final"
location that will appear in the BATSE catalog.  There are four fields for the
IPN annulus (the RA & Dec of the center of the annulus, the radius of it, and
the width of the annulus.
(2) Some comments describing the status/accuracy of this localization and
any particular or noteworthy comments on that specific burst.
(3) The arc segment in RA,Dec tabular form.  The location along the arc segment
that has the maximum probablilty of the GRB location is marked.  This is not a
rigorous quantitative determination, but a determination made by a human 
folding in the locations and sizes of the sizes of the BACODINE and HUNTSVILLE
error circles.  While every effort will be made to choose this location
correctly, it should be used by observers only as a guide in making their
follow-up observations.  Eventually, I would like to be able to mark the table
with plus and minus 3 sigma points which can also be used as a guide.
Down the road, it may be possible to distribute all of this location information
in graphical form via postscript files (or similar).

I would like people to comment on the format and content of this notification.
You should suggest what you like and don't like, and what is missing.
At this point it is unclear how people will use this information for making
follow-up observations, so the format & content may not be optimized.
The plan is to come up with a suitable format & contents that satisfies
everyone's needs.

Scott Barthelmy                      NASA-GSFC, Code 661, Greenbelt, MD   20771
PHONE:  301-286-3106                 (work)
FAX:    301-286-1684                 (1st choice,  -1682 2nd choice)
EMAIL:  scott@xtelab.gsfc.nasa.gov
PAGER:  1-800-SKY-PAGE, PIN 2618712  (by phone)
PAGER:  2618712@skymail.com          (by email, 240 characters max per message)


///////////////////////////////////////////////////////////////////////////
TITLE:          IPN LOCALIZATION
TRIGGER_NUM:    3385
DATE_TIME:      95/01/31 11:35:35 UT
BACO_RA:         11.03d {+00h 44m 06s}  (J2000)
BACO_DEC:       +23.44d {+23d 41' 27"}
HUNT_RA:          6.82d {+00h 27m 17s}  (J2000)
HUNT_DEC:       +22.72d {+22d 43' 12"}
DELTA:            3.93 [deg]
ANNULUS_RA:     331.8100d {+22h 07m 14s}  (J2000)
ANNULUS_DEC:    -31.8376d {-31d 50' 15"}
ANNULUS_RADIUS:  67.925 [deg]
ANNULUS_WIDTH:  0.224 [deg] (Total width)

This IPN localization is preliminary.  The "total width" of the annulus
was selected to include all known uncertainties and systematics.  The final
analysis will reduce this width.  All follow-up queries should be addressed to
Kevin Hurley (UC Berkeley, khurley@sunspot.ssl.berkeley.edu).

This IPN annulus is tabulated below along the segment that intersects
a combination of the BACODINE and Huntsville error circles.

RA      DEC      (J2000)

4.237	28.689
4.633	28.491
5.027	28.291
5.418	28.089
5.808	27.885
6.195	27.679
6.581	27.471
6.964	27.261
7.345	27.049
7.724	26.835
8.101	26.619
8.476	26.401
8.849	26.181        <=== Max probability
9.219	25.959
9.588	25.735
9.954	25.510
10.318	25.282
10.680	25.053
11.040	24.822
11.399	24.589
11.755	24.355
12.108	24.118
12.460	23.880
12.810	23.641
13.158	23.399
13.504	23.156
13.848	22.911
14.189	22.665
14.529	22.417
14.867	22.168
15.203	21.916
15.537	21.664
15.869	21.409
16.199	21.154
16.527	20.896
16.853	20.638
17.178	20.377
--------------------------- THE END ---------------------------