{
  "id": 69432,
  "title": "Is flux on log scale or not?",
  "url": "/competitions/PLAsTiCC-2018/discussion/69432",
  "author_name": "",
  "post_date": "2018-10-23T19:05:51.266641500Z",
  "votes": 4,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Title says it all.</p>\n\n<p>Maybe the answer is provided in the documents shared with us, but I missed it in that case.</p>",
  "messages": [
    {
      "id": "409046",
      "postDate": "10/23/2018 19:05:51",
      "content": "<p>Title says it all.</p>\n\n<p>Maybe the answer is provided in the documents shared with us, but I missed it in that case.</p>",
      "rawMarkdown": "Title says it all.\n\nMaybe the answer is provided in the documents shared with us, but I missed it in that case.",
      "votes": null
    },
    {
      "id": "409162",
      "postDate": "10/23/2018 21:27:17",
      "content": "<p>Almost certainly is in absolute values, not log. I can´t pinpoint any specific mention of it, but it can at least be indirectly confirmed by the symmetry of the fluxes and the size of the errors. Also, the data description hints this is the case (and btw, it is an important aspect to consider):</p>\n\n<p>Negative Flux: Due to statistical fluctuations (of e.g. the sky brightness) and the way the brightness is estimated, the flux may be negative for dim sources, where the true flux is close to zero. Second, if the pre-survey image actually contains a flux brighter than its true ‘zero’, this can lead to a negative flux when the difference is computed.</p>",
      "rawMarkdown": "Almost certainly is in absolute values, not log. I can´t pinpoint any specific mention of it, but it can at least be indirectly confirmed by the symmetry of the fluxes and the size of the errors. Also, the data description hints this is the case (and btw, it is an important aspect to consider):\n\nNegative Flux: Due to statistical fluctuations (of e.g. the sky brightness) and the way the brightness is estimated, the flux may be negative for dim sources, where the true flux is close to zero. Second, if the pre-survey image actually contains a flux brighter than its true ‘zero’, this can lead to a negative flux when the difference is computed.",
      "votes": null
    },
    {
      "id": "409324",
      "postDate": "10/24/2018 06:02:21",
      "content": "<blockquote>\n  <p>confirmed by the symmetry of the fluxes and the size of the errors</p>\n</blockquote>\n\n<p>I agree, that's what I saw as well after asking the question.</p>",
      "rawMarkdown": "&gt; confirmed by the symmetry of the fluxes and the size of the errors\n\nI agree, that's what I saw as well after asking the question.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 409162,
      "author_name": "panosc",
      "author_url": "",
      "post_date": "10/23/2018 21:27:17",
      "content": "<p>Almost certainly is in absolute values, not log. I can´t pinpoint any specific mention of it, but it can at least be indirectly confirmed by the symmetry of the fluxes and the size of the errors. Also, the data description hints this is the case (and btw, it is an important aspect to consider):</p>\n\n<p>Negative Flux: Due to statistical fluctuations (of e.g. the sky brightness) and the way the brightness is estimated, the flux may be negative for dim sources, where the true flux is close to zero. Second, if the pre-survey image actually contains a flux brighter than its true ‘zero’, this can lead to a negative flux when the difference is computed.</p>",
      "votes": null,
      "replies": [
        {
          "id": 409324,
          "author_name": "cpmpml",
          "author_url": "",
          "post_date": "10/24/2018 06:02:21",
          "content": "<blockquote>\n  <p>confirmed by the symmetry of the fluxes and the size of the errors</p>\n</blockquote>\n\n<p>I agree, that's what I saw as well after asking the question.</p>",
          "votes": null,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "409046": "Title says it all.\n\nMaybe the answer is provided in the documents shared with us, but I missed it in that case.",
    "409162": "Almost certainly is in absolute values, not log. I can´t pinpoint any specific mention of it, but it can at least be indirectly confirmed by the symmetry of the fluxes and the size of the errors. Also, the data description hints this is the case (and btw, it is an important aspect to consider):\n\nNegative Flux: Due to statistical fluctuations (of e.g. the sky brightness) and the way the brightness is estimated, the flux may be negative for dim sources, where the true flux is close to zero. Second, if the pre-survey image actually contains a flux brighter than its true ‘zero’, this can lead to a negative flux when the difference is computed.",
    "409324": "&gt; confirmed by the symmetry of the fluxes and the size of the errors\n\nI agree, that's what I saw as well after asking the question."
  },
  "source": "meta"
}