<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><span style="font-family:arial,sans-serif">On Sat, Oct 7, 2017 at 11:12 PM, spike </span><span dir="ltr" style="font-family:arial,sans-serif"><<a href="mailto:spike66@att.net" target="_blank">spike66@att.net</a>></span><span style="font-family:arial,sans-serif"> wrote:</span><br></div><div class="gmail_extra"><div class="gmail_quote"> <br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div lang="EN-US"><div class="gmail-m_2545220417184542467WordSection1"><p class="MsoNormal"><u></u><u></u></p><p class="MsoNormal"><u></u><u></u></p><p class="MsoNormal"></p><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline">> </div>Best guess, they will tell us they found a merger of two neutron stars. That will have a different signature from the black hole merger. <p></p></div></div></blockquote><div><br></div><font size="4">I think that's a good guess. And if we're very lucky satellites may have detected a fast gamma ray burst that occurred at the<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>exact<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>same time<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>that<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>LIGO detected<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>a<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>gravitational wave.</font></div><div class="gmail_quote"><br></div><div class="gmail_quote"><font size="4">We know<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>that<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>on August 18 2017 at<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>12:41:06.47<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>Universal Time<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>the Fermi Gamma-Ray satellite detected a fast gamma ray burst lasting 2.048 seconds<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>coming from<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>the<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>vicinity of<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>galaxy NGC 4993<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>about 130 million<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>light years<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>from Earth,<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>and we know that by fast gamma ray burst standards this one was a bit closer than average but was not particularly powerful, probably because it was not aimed directly at us. Gamma ray bursts are not rare, during the last 9 years on average one has been<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>detected<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>per day,<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>and<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>on the face of it<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>there seemed<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>to be<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> nothing</div> special about this one, and yet for some reason on that same day of August 18 LIGO sent out confidential messages (that leaked of course) to optical and radio astronomers strongly suggesting that today would be a very good day to look at NGC 4993<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> and its environs. </div>Now why<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>in the world<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> </div>would they do that? Hmm...</font></div><div class="gmail_quote"><font size="4"><br></font></div><div class="gmail_quote"><font size="4"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;display:inline"> John K Clark </div><br> </font><br></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br></div><div class="gmail_quote"><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div lang="EN-US"><div class="gmail-m_2545220417184542467WordSection1"><div><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"><u></u></p></div></div></div>
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