<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 6 Sep 2019, at 16:13, Chia Min Tan <<a href="mailto:chiamin.tan@postgrad.manchester.ac.uk" class="">chiamin.tan@postgrad.manchester.ac.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div id="divtagdefaultwrapper" dir="ltr" style="caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;" class=""><div id="divtagdefaultwrapper" dir="ltr" style="font-size: 12pt; font-family: Calibri, Helvetica, sans-serif, EmojiFont, "Apple Color Emoji", "Segoe UI Emoji", NotoColorEmoji, "Segoe UI Symbol", "Android Emoji", EmojiSymbols;" class=""><div style="margin-top: 0px; margin-bottom: 0px;" class="">Hi everyone</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">I have received quite a few constructive comments about the paper and have been working on them over the past few weeks. Thanks to those that have sent me their feedback.<span class="Apple-converted-space"> </span><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">I have actually made quite a few significant changes to the structure of the paper. I have rewritten the introduction of the paper to focus more on observing pulsars at low frequencies instead of a general introduction to pulsar observations. I have also reorganise the paper, where I place the observation and data analysis descriptions in Section 2 and focus on the various results in other sections. I have also made changes and additions on various result sections based on the questions and comments I have received. I've also added some discussion about the long-term flux density variation of PSR J1657+3304 and how it is unlikely to be scintillation.<br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">I have also received question about whether to present the binary pulsar PSR J1658+3630 in a separate paper. My plan now is to present the timing solution of the pulsar (including coarse modelling of DM variation to reduce the timing residual) and the average profile and spectrum. There are many more interesting work that can be done with the pulsar including modelling the scintillation properties, study of long term DM and profile variation, and also possibly to look at the optical properties of the binary companion. Cees previously kept some of the raw CV data from the pulsar with the thought of reprocess them with finer channels for scintillation studies. I'm not sure if he still have those data lying around.</div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">If anyone has any comments about the updated draft please send it to me within two weeks. Also for those who have sent me feedback, can you confirm if you want to be on the paper as a co-author and send me your<span class="Apple-converted-space"> </span><span class="">affiliation</span>?<br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class=""><br class=""></div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Cheers</div><div style="margin-top: 0px; margin-bottom: 0px;" class="">Chia Min<br class=""></div></div><hr tabindex="-1" style="display: inline-block; width: 780.078125px;" class=""><div id="divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" style="font-size: 11pt;" class=""><b class="">From:</b><span class="Apple-converted-space"> </span>Michael Kramer <<a href="mailto:mkramer@mpifr-bonn.mpg.de" class="">mkramer@mpifr-bonn.mpg.de</a>><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Tuesday, August 20, 2019 1:21:51 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>Cees Bassa <<a href="mailto:cbassa@gmail.com" class="">cbassa@gmail.com</a>><br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>Chia Min Tan <<a href="mailto:chiamin.tan@postgrad.manchester.ac.uk" class="">chiamin.tan@postgrad.manchester.ac.uk</a>>; <a href="mailto:lofarpwg@astron.nl" class="">lofarpwg@astron.nl</a> <<a href="mailto:lofarpwg@astron.nl" class="">lofarpwg@astron.nl</a>><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [Lofarpwg] LOTAAS binary pulsar + 20 timing paper</font><div class=""> </div></div><div class=""><div class="x_BodyFragment"><font size="2" class=""><span style="font-size: 11pt;" class=""><div class="x_PlainText">Dear Chia Min,<br class=""><br class="">I read the paper and have some comments which are hopefully useful. Please, let me know if<br class="">my handwriting is difficult.<br class=""><br class="">Please, note my comments about the reference to spectra paper - which is also relevant for<br class="">the census papers (I’ll read those shortly). The problem with the cited Bates et al. and<br class="">Jankowski et al references is, that the spectra in both papers were derived for a relatively<br class="">small frequency range, which is well above the the LOFAR frequencies. When you make<br class="">comparisons it is probably more appropriate to refer to samples which are drawn from<br class="">data covering the whole frequency range. Here the best reference is probably still Maron et al.<br class=""><br class="">Anyway, I hope the comments are useful.<br class=""><br class="">Cheers, Michael<br class=""><br class=""></div></span></font></div><div class="x_BodyFragment"><font size="2" class=""><span style="font-size: 11pt;" class=""><div class="x_PlainText"><br class=""><br class="">> On 6 Aug 2019, at 15:17, Cees Bassa <<a href="mailto:cbassa@gmail.com" class="">cbassa@gmail.com</a>> wrote:<br class="">><span class="Apple-converted-space"> </span><br class="">> Hi Chia Min,<br class="">><span class="Apple-converted-space"> </span><br class="">> Thanks for sending the draft around. There's some nice work in the paper.<br class="">><span class="Apple-converted-space"> </span><br class="">> Below are comments up to section 4. I'll try to get my comments on the<br class="">> rest of the paper by the end of the week.<br class="">><span class="Apple-converted-space"> </span><br class="">> Regards,<br class="">> Cees<br class="">><span class="Apple-converted-space"> </span><br class="">> Title:<br class="">><span class="Apple-converted-space"> </span><br class="">> * The title is perhaps a bit long. Since the title of Daniele's paper<br class="">> was: "LOTAAS: Characterization of 20 pulsars", you could use<br class="">> "LOTAAS: Timing of 21 pulsars", though I agree that having the<br class="">> binary MSP in the title is a plus.<br class="">><span class="Apple-converted-space"> </span><br class="">> SECTION 1:<br class="">><span class="Apple-converted-space"> </span><br class="">> * I think the introduction needs a bit more work. Right now, the<br class="">> information motivating this paper (pulsar properties from timing,<br class="">> spectral indices from multi-frequency follow-up, pulse profile<br class="">> evolution) is available, but it is not in a logical order. My<br class="">> suggestion would be that you start with a general overview of pulsar<br class="">> science, which has sofar been predominantly done at higher<br class="">> frequencies and the importance of observing at lower<br class="">> frequencies. You can then provide some information of low-frequency<br class="">> studies of known pulsars (Pilia profiles, LOFAR Census, MSP Census,<br class="">> Sobey RM study). This naturally leads into LOTAAS as the first real<br class="">> low frequency pulsar search, and that this paper presents some of<br class="">> the first timing and multi-frequency results of pulsars discovered<br class="">> at these low frequencies.<br class="">><span class="Apple-converted-space"> </span><br class="">> SECTION 2:<br class="">><span class="Apple-converted-space"> </span><br class="">> * In the first paragraph it would be good to compare the setup of the<br class="">> timing observations to that of the search observations in terms of<br class="">> number of stations, bandwidth and integration time.<br class="">><span class="Apple-converted-space"> </span><br class="">> * Mention psrchive (with Hotan ref) after dspsr.<br class="">><span class="Apple-converted-space"> </span><br class="">> * Did you not use any ROACH data from Jodrell? Certainly for the<br class="">> 334MHz observations the coherent dedispersion will be important.<br class="">><span class="Apple-converted-space"> </span><br class="">> * I would also restructure section 2 somewhat, as right now the<br class="">> information is spread about. Perhaps a subsection for timing<br class="">> observations, timing of the binary, and follow up observations for<br class="">> profile evolution and spectral properties. Another approach would be<br class="">> to split it in LOFAR core, Jodrell and GLOW observations.<br class="">><span class="Apple-converted-space"> </span><br class="">> * The paragraphs about J1658 are also confusing, and I think all this<br class="">> information can be distilled into a table. You also need to clarify<br class="">> the timing procedure a bit, in that we start off with binary<br class="">> parameters determined from variations in the spin period (an<br class="">> incoherent timing solution), to a coherent timing solution where you<br class="">> account for all rotations of the pulsar. You might also clarify the<br class="">> 'accounting for all rotations' at the start of section 2 when<br class="">> discussing the timing of normal pulsars.<br class="">><span class="Apple-converted-space"> </span><br class="">> * Table 1: miutes -> minutes<br class="">><span class="Apple-converted-space"> </span><br class="">> * Table 1: Somewhere in the paper we need to provide the JXXXX+YY<br class="">> names from the LOTAAS overview paper to these timing names. This<br class="">> naturally fits in table 1.<br class="">><span class="Apple-converted-space"> </span><br class="">> SECTION 3:<br class="">><span class="Apple-converted-space"> </span><br class="">> * For determining the template, you need to specify to which profile<br class="">> you fitted the von Mises profiles. Was it the single observation<br class="">> with the highest S/N or some average of profiles?<br class="">><span class="Apple-converted-space"> </span><br class="">> * Add how many von Mises functions you had to use (just give the<br class="">> minimum and maximum).<br class="">><span class="Apple-converted-space"> </span><br class="">> * "are split into 2 frequency channels" -> "are averaged into two<br class="">> frequency channels".<br class="">><span class="Apple-converted-space"> </span><br class="">> * I'm a bit worried by only using two frequency channels to measure<br class="">> DM, as you are using two measurements to obtain two parameters (TOA<br class="">> and DM).<br class="">><span class="Apple-converted-space"> </span><br class="">> * How were the templates at different frequencies referenced to<br class="">> absolute phase? If scattering or intrinsic profile evolution is<br class="">> present then you could impart a DM offset by this approach.<br class="">><span class="Apple-converted-space"> </span><br class="">> * You need to clarify what is meant by a jump. That is not<br class="">> nomenclature that non-pulsar astronomers know. Also change "Any<br class="">> offsets" to "Any time offsets", and perhaps specify what causes<br class="">> these (cable length differences etc).<br class="">><span class="Apple-converted-space"> </span><br class="">> * In paragraph 2 "In order to...", you may want to make it clear that<br class="">> the dense campaigns were meant to remove ambiguities in the number<br class="">> of pulse rotations between consecutive observations, and that<br class="">> getting phase connection on short timescales allowed extrapolating<br class="">> the timing solution to longer timescales without introducting<br class="">> ambiguities.<br class="">><span class="Apple-converted-space"> </span><br class="">> * I mentioned this for section 2 as well, but for the timing solution<br class="">> of J1658; explain that you got initial orbital parameters by<br class="">> modelling the spin period variations, and used those to obtain a<br class="">> phase coherent timing solution.<br class="">><span class="Apple-converted-space"> </span><br class="">> * I am not sure a reference exists for FITORBIT, in which case you may<br class="">> have to explain in a bit more detail what the software does.<br class="">><span class="Apple-converted-space"> </span><br class="">> * "... is a low S/N pulsar" is an incorrect statement. low S/N is a<br class="">> property of the telescope, not really the pulsar. Maybe rewrite to<br class="">> "In the initial timing observations of PSR J1643+1338 it was<br class="">> detected at low S/N."<br class="">><span class="Apple-converted-space"> </span><br class="">> * Section 3 is mixing observations and their analysis with<br class="">> results. This may be a large change, but I think the first 4<br class="">> paragraphs could be joined with section 2 to make a "Observations<br class="">> and timing analysis" section. This resolves some of the duplicity of<br class="">> the statements between section 2 and 3. The rest of section 3 could<br class="">> be called "Timing properties".<br class="">><span class="Apple-converted-space"> </span><br class="">> Sections 4 and 5 also mix analysis and results. I think it would be<br class="">> more logical to include the first paragraph of section 4 in section<br class="">> 2, and similarly the first few paragraphs of section 5 also fit<br class="">> better in section 2.<br class="">> _______________________________________________<br class="">> lofarpwg mailing list<br class="">> <a href="mailto:lofarpwg@astron.nl" class="">lofarpwg@astron.nl</a><br class="">><span class="Apple-converted-space"> </span><a href="http://mailman.astron.nl/listinfo/lofarpwg" id="LPlnk35245" class="OWAAutoLink" previewremoved="true">http://mailman.astron.nl/listinfo/lofarpwg</a><br class=""><br class="">----------------------------------------------------------------------------------------------------------<br class="">Prof. Dr. Michael Kramer<br class="">Director - Max-Planck-Institut für Radioastronomie, Bonn, Germany<br class="">Professor for Astrophysics - University of Manchester, UK<br class="">Professor (Hon-Prof.) - University of Bonn, Germany<br class=""><br class="">Address: MPI fuer Radioastronomie<br class=""> Auf dem Huegel 69<br class=""> 53121 Bonn, Germany<br class=""><br class="">Phone: +49-228-525-278 (direct)<br class=""> +49-228-525-299 (secretary)<br class=""><br class=""><a href="mailto:mkramer@mpifr-bonn.mpg.de" class="">EMAIL: mkramer@mpifr-bonn.mpg.de</a> / <a href="mailto:michael.kramer@manchester.ac.uk" class="">michael.kramer@manchester.ac.uk</a><br class="">----------------------------------------------------------------------------------------------------------<br class=""><br class=""><br class=""></div></span></font></div></div></div><span id="cid:F183F560-16A2-412F-B8FD-EAF942B10FB7@client.m3-hotspots.de"><Timing_of_LOTAAS_binary_and_20_other_pulsars_v2.pdf></span><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">lofarpwg mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="mailto:lofarpwg@astron.nl" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">lofarpwg@astron.nl</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><a href="http://mailman.astron.nl/listinfo/lofarpwg" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">http://mailman.astron.nl/listinfo/lofarpwg</a></div></blockquote></div><br class=""><div class="">
----------------------------------------------------------------------------------------------------------<br class="">Prof. Dr. Michael Kramer<br class="">Director - Max-Planck-Institut für Radioastronomie, Bonn, Germany<br class="">Professor for Astrophysics - University of Manchester, UK<br class="">Professor (Hon-Prof.) - University of Bonn, Germany<br class=""><br class="">Address: MPI fuer Radioastronomie<br class=""> Auf dem Huegel 69<br class=""> 53121 Bonn, Germany<br class=""><br class="">Phone: +49-228-525-278 (direct)<br class=""> +49-228-525-299 (secretary)<br class=""><br class=""><a href="mailto:mkramer@mpifr-bonn.mpg.de" class="">EMAIL: mkramer@mpifr-bonn.mpg.de</a> / <a href="mailto:michael.kramer@manchester.ac.uk" class="">michael.kramer@manchester.ac.uk</a><br class="">----------------------------------------------------------------------------------------------------------<br class=""><br class="">
</div>
<br class=""></div></body></html>