From: <shoriuchi_at_email.protected>
Date: Thu, 4 Nov 2010 09:49:48 +1100

Hi Aquib,

Do you think we are still going to observe for the second and third VLBI
epochs this time? Good news is DSS45 (34m) can definitely observe for
the 8th of November session (vh16e, 311/0400-0800 UT), so the array
should get more sensitivity than the original plan.

Regards,
Shinji.

-----Original Message-----
From: owner-vlbiobs_at_atnf.<!--nospam-->csiro.au [mailto:owner-vlbiobs_at_atnf.<!--nospam-->csiro.au]
On Behalf Of Aquib Moin
Sent: Thursday, 4 November 2010 1:53 AM
To: George Nicolson
Cc: Tasso.Tzioumis_at_csiro.<!--nospam-->au; vlbiobs_at_atnf.<!--nospam-->csiro.au;
Chris.Phillips_at_csiro.<!--nospam-->au; James.Miller-Jones_at_curtin.<!--nospam-->edu.au;
steven.tingay_at_icrar.<!--nospam-->org; c.reynolds_at_curtin.<!--nospam-->edu.au; jon_at_hartrao.<!--nospam-->ac.za
Subject: RE: Cir X-1 Trigger observatios.

Hi George,

Do you think it is possibility that the flare might be delayed by a few
hours? It has happened during some previous cycles?

It could be that we'll catch some flaring activity during the ATCA
observations before VLBI. Fingers still crossed.

Thanks and best regards,

Aquib
________________________________________
From: George Nicolson [george_at_hartrao.<!--nospam-->ac.za]
Sent: Wednesday, 3 November 2010 10:38 PM
To: Aquib Moin
Cc: Tasso.Tzioumis_at_csiro.<!--nospam-->au; vlbiobs_at_atnf.<!--nospam-->csiro.au;
Chris.Phillips_at_csiro.<!--nospam-->au; James.Miller-Jones_at_curtin.<!--nospam-->edu.au;
steven.tingay_at_icrar.<!--nospam-->org; c.reynolds_at_curtin.<!--nospam-->edu.au; george_at_hartrao.<!--nospam-->ac.za;
jon_at_hartrao.<!--nospam-->ac.za
Subject: Cir X-1 Trigger observatios.

Dear all,

We completed the Cir X-1 trigger observations, the last one ending 7
minutes before the VLBI.

The pre-onset_time observations (11 scans at 3.5 cm) ranged from -26 to
+21 mJy, averaging at 0.1 mJy +/- 4 mJy. This is typical of daily
averages
during the non-flaring state, where average flux is usually within +/-
10
mJy.

The post-onset_time observations were all negative:

11:02 UT -14 +/- 11 mJy
11:24 UT -17 +/- 17 mJy
11:44 UT -24 +/- 15 mJy
11:53 UT -21 +/- 20 mJy

The last three measurements were based on only one polarisation, hence
the
higher erors.

For interest I include a plot of the results of recent flares. Today's
measurements are the pale blue dots from -5 hrs to +2 hours. For a
strong
flare I would have expected a rise of 200 mJy, or if it was an hour
late,
possibly 100 mJy.

So the result is not very positive. Given that the flare can be op to 2
hours early or late, I'd say that the the chance of there not being a
strong flare is about 60-70%. I understand that ATCA observations before
the VLBI will be used as a further constraint, which is a good idea.

Good luck - too bad I'm not the bearer of better news.

Regards,

George

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Received on 2010-11-04 09:50:31