Abstract
The detection of mJy/sub-mJy point sources is a significant challenge for single-dish radio telescopes. Detection or upper limits on the faint afterglow from GRBs or other sources at cosmological distances are important means of constraining the source modeling. Using the Sardinia Radio Telescope (SRT), we compare the sensitivity and robustness of three methods applied to the detection of faint radio sources from raster maps around a known source position: the smart ‘quick-look’ method, the ‘source extraction’ method (typical of high-energy astronomy), and the fit with a 2-D Gaussian. We developed a Python code specific for the analysis of point-like radio sources applied to the SRT C-band (6.9 GHz) observations of both undetected sources (GRB afterglows of 181201A and 190114C) and the detected Galactic X-ray binary GRS 1915 + 105. Our comparative analysis of the different detection methods made extensive use of simulations as a useful complement to actual radio observations. The best method for the SRT data analysis is the fit with a 2-D Gaussian, as it pushes down the sensitivity limits of single-dish observations – with respect to more traditional techniques – to \(\sim 1.8\) mJy, improving by \(\sim 40\) % compared with the initial value. This analysis shows that – especially for faint sources – good maps of the scanned region pre- or post-outburst are essential.
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Notes
The root mean square (RMS) of the image is the standard deviation of pixels flux densities taken in image regions not affected by the source flux.
Radio waves interact with the antenna (the parabolic reflector) where they are carried to a focus. At the focus the radio waves in free space are coupled to an antenna through a device called a feed, that probes the electric field of incoming radiation rotating counterclockwise (right-hand circular polarization, RCP) and clockwise (left-hand circular polarization, LCP), respectively, as functions of time (e.g. [52]).
We are not able to make a precise estimate because the baseline can also vary by a factor of 2 in a few seconds, and hence on-off subtractions can cause errors of the baseline that compromise the possibility of reaching sensitivity of the order of the mJy.
The half power beamwidth (HPBW) is the angular separation in which the magnitude of the radiation pattern decrease by 50% (or 3 dB) from the peak of the main beam.
For our purpose, we fixed a = b (circular beam) and θ = 0.
This statement represents a guideline for this kind of analysis, and it does not seem to change even by modifying the observational parameters; new instrumentation and future observations will allow to further verify this conclusion.
References
Giroletti, M., Righini, S.: MNRAS, 492, 2, 2807 (2020)
Maddalena, R.J.: Reduction and Analysis Techniques. Astron. Soc. Pac. Conf. Ser. 278, 329–352 (2002)
Chandra, P., Frail, D.A. : . Astrophys J. Lett. 746, 156 (2012). https://doi.org/10.1088/0004-637X/746/2/156
Chandra, P.: Advances in Astronomy 296781, 2016 (2016). https://doi.org/10.1155/2016/2967813
Abbott, B.P., Abbott, R., Abbott, T.D., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., et al.: Astrophys J. Lett. 848, L12 (2017). https://doi.org/10.3847/2041-8213/aa91c9
Alexander, K.D., Berger, E., Fong, W., Williams, P.K.G., Guidorzi, C., Margutti, R., Metzger, B.D., Annis, J., Blanchard, P.K., Brout, D., Brown, D.A., Chen, H.Y., Chornock, R., Cowperthwaite, P.S., Drout, M., Eftekhari, T., Frieman, J., Holz, D.E., Nicholl, M., Rest, A., Sako, M., Soares-Santos, M., Villar, V.A.: Astrophys J. Lett. 848, L21 (2017). https://doi.org/10.3847/2041-8213/aa905d
Margutti, R., Alexander, K.D., Xie, X., Sironi, L., Metzger, B.D., Kathirgamaraju, A., Fong, W., Blanchard, P.K., Berger, E., MacFadyen, A., Giannios, D., Guidorzi, C., Hajela, A., Chornock, R., Cowperthwaite, P.S., Eftekhari, T., Nicholl, M., Villar, V.A., Williams, P.K.G., Zrake, J.: Astrophys J. Lett. 856, L18 (2018). https://doi.org/10.3847/2041-8213/aab2ad
Granot, J., Sari, R.: Astrophys J. 568(2), 820 (2002). https://doi.org/10.1086/338966
Kulkarni, S.R., Djorgovski, S.G., Odewahn, S.C., Bloom, J.S., Gal, R.R., Koresko, C.D., Harrison, F.A., Lubin, L.M., Armus, L., Sari, R., Illingworth, G.D., Kelson, D.D., Magee, D.K., van Dokkum, D.A., Frail, J.S., Frail, J.S., xMalkan, I.S., McClean, H.I., Teplitz, D., Koerner, D., Kirkpatrick, N., Kobayashi, I.A., Yadigaroglu, J., Halpern, T., Piran, R.W., Goodrich, F.H., Chaffee, M., Feroci, E., Costa: . Nature 398, 389 (1999). https://doi.org/10.1038/18821
Laskar, T., Berger, E., Zauderer, B.A., Margutti, R., Soderberg, A.M., Chakraborti, S., Lunnan, R., Chornock, R., Chandra, P., Ray, A.: Apj 776, 119 (2013). https://doi.org/10.1088/0004-637X/776/2/119
Laskar, T., Alexander, K.D., Gill, R., Granot, J., Berger, E., Mundell, C.G., Barniol Duran, R., Bolmer, J., Duffell, P., van Eerten, H., Fong, W.f. , Kobayashi, S., Margutti, R., Schady, P.: Astrophys J. Lett. 878 (1), L26 (2019). https://doi.org/10.3847/2041-8213/ab2247
Rhoads, J.E: . Astrophys J. 525, 737 (1999). https://doi.org/10.1086/307907
Sari, R., Piran, T., Halpern, J.P.: ApJ 519, L17 (1999). https://doi.org/10.1086/312109
Frail, D.A., Waxman, E., Kulkarni, S.R.: Astrophys J. 537(1), 191 (2000). https://doi.org/10.1086/309024
Alexander, K.D., Laskar, T., Berger, E., Mundell, C.G., Margutti, R.: GRB Coordinates Network 23726, 1 (2019)
Volnova, A., Mazaeva, E., Buckley, D., Pozanenko, A.: GRB Coordinates Network 23477, 1 (2018)
Izzo, L., Noschese, A., D’Avino, L., Mollica, M.: GRB Coordinates Network 23699, 1 (2019)
Mereghetti, S., Gotz, D., Ferrigno, C., Bozzo, E., Savchenko, V., Ducci, L., Borkowski, J.: GRB Coordinates Network 23469, 1 (2018)
Arimoto, M., Axelsson, M., Ohno, M.: GRB Coordinates Network 23480, 1 (2018)
Pintore, F., Mereghetti, S., Gotz, D., Ferrigno, C., Bozzo, E., Savchenko, V., Ducci, L., Borkowski, J.: GRB Coordinates Network 23472, 1 (2018)
Cai, C., Li, C.K., Li, X.B., Li, G., Liao, J.Y., Xiong, S.L., Liu, C.Z., Li, X.F., Li, Z.W., Chang, Z., Lu, X.F., Zhao, J.L., Zhang, A.M., Zhang, Y.F., Zou, C.L., Jin, Y.J., Zhang, Z., Li, T.P., Lu, F.J., Song, L.M., Wang, H.Y., Wu, M., Xu, Y.P., Zhang, S.N.: GRB Coordinates Network 23491, 1 (2018)
Watson, A.M., Pereyra, M., Butler, N., Becerra, R.L., Lee, W.H., Roman-Zuniga, C., Kutyrev, A., Troja, E.: GRB Coordinates Network 23481, 1 (2018)
Laskar, T., van Eerten, H., Schady, P., Mundell, C.G., Alexander, K.D., Barniol Duran, R., Berger, E., Bolmer, J., Chornock, R., Coppejans, D.L., fong, W.f., Gomboc, A., Jordana-Mitjans, N., xKobayashi, D.A.H., Margutti, R., Menten, K.M., Sari, R., Yamazaki, R., Lipunov, V.M., Gorbovskoy, E., Kornilov, V.G., Tyurina, N., Zimnukhov, D., Podesta, R., Levato, H., Buckley, D.A.H., Tlatov, A., Rebolo, R., Serra-Ricart, M.: Astrophys J. 884(2), 121 (2019). https://doi.org/10.3847/1538-4357/ab40ce
Belkin, S., Mazaeva, E., Pozanenko, A., Minaev, P., Volnova, A., Tominaga, N., Blinnikov, S., Chestnov, D., Klunko, E., Reva, I., Rumyantsev, V., Buckley, D., Inasaridze, R.y: . GRB Coordinates Network 23601, 1 (2019)
Izzo, L., de Ugarte Postigo, A., Kann, D.A., Malesani, D.B., Heintz, K.E., Tanvir, N.R., D’Elia, V., Wiersema, K., Kouveliotou, C., Levan, A.J.: GRB Coordinates Network 23488, 1 (2018)
Laskar, T., Berger, E., Chornock, R., Fong, W., Margutti, R., Mundell, C.G., Schady, P.: GRB Coordinates Network 23519, 1 (2018)
Barthelmy, S.D., Barbier, L.M., Cummings, J.R., Fenimore, E.E., Gehrels, N., Hullinger, D., Krimm, H.A., Markwardt, C.B., Palmer, D.M., Parsons, A., Sato, G., Suzuki, M., Takahashi, T., Tashiro, M., Tueller, J.: Space Sci. Rev. 120, 143 (2005). https://doi.org/10.1007/s11214-005-5096-3
Gehrels, N., Chincarini, G., Giommi, P., Mason, K.O., Nousek, J.A., Wells, A.A., White, N.E., Barthelmy, S.D., Burrows, D.N., Cominsky, L.R., Hurley, K.C., Marshall, F.E., Mészáros, P., Roming, P.W.A., Angelini, L., Barbier, L.M., Belloni, T., Campana, S., Caraveo, P.A., Chester, M.M., Citterio, O., Cline, T.L., Cropper, M.S., Cummings, J.R., Dean, A.J., Feigelson, E.D., Fenimore, E.E., Frail, D.A., Fruchter, A.S., Garmire, G.P., Gendreau, K., Ghisellini, G., Greiner, J., Hill, J.E., Hunsberger, S.D., Krimm, H.A., Kulkarni, S.R., Kumar, P., Lebrun, F., Lloyd-Ronning, N.M., Markwardt, C.B., Mattson, B.J., Mushotzky, R.F., Norris, J.P., Osborne, J., Paczynski, B., Palmer, D.M., Park, H.S., Parsons, A.M., Paul, J., Rees, M.J., Reynolds, C.S., Rhoads, J.E., Sasseen, T.P., Schaefer, B.E., Short, A.T., Smale, A.P., Smith, I.A., Stella, L., Tagliaferri, G., Takahashi, T., Tashiro, M., Townsley, L.K., Tueller, J., Turner, M.J.L., Vietri, M., Voges, W., Ward, M.J., Willingale, R., Zerbi, F.M., Zhang, W.W.: ApJ 611, 1005 (2004). https://doi.org/10.1086/422091
Gropp, J.D., Barthelmy, S.D., Moss, M.J., Palmer, D.M., Tohuvavohu, A.: GRB Coordinates Network 23642, 1 (2019)
Castro-Tirado, A.J., Hu, Y., Fernandez-Garcia, E., Valeev, A., Sokolov, V., Guziy, S., Oates, S., Jeong, S., Pandey, S.B., Carrasco, I., Reverte-paya, D.: GRB Coordinates Network 23708, 1 (2019)
Frederiks, D., Golenetskii, S., Aptekar, R., Kozlova, A., Lysenko, A., Svinkin, D., Tsvetkova, A., Ulanov, M., Cline, T.: GRB Coordinates Network 23737, 1 (2019)
Meegan, C., Lichti, G., Bhat, P.N., Bissaldi, E., Briggs, M.S., Connaughton, V., Diehl, R., Fishman, G., Greiner, J., Hoover, A.S., van der Horst, A.J., von Kienlin, A., Kippen, R.M., Kouveliotou, C., McBreen, S., Paciesas, W.S., Preece, R., Steinle, H., Wallace, M.S., Wilson, R.B., Wilson-hodge, C. : . ApJ 702, 791 (2009). https://doi.org/10.1088/0004-637X/702/1/791
Hamburg, R., Veres, P., Meegan, C., Burns, E., Connaughton, V., Goldstein, A., Kocevski, D., Roberts, O.J.: GRB Coordinates Network 23707, 1 (2019)
Kocevski, D., Omodei, N., Axelsson, M., Burns, E., Vianello, G., Bissaldi, E., Longo, F.: GRB Coordinates Network 23709, 1 (2019)
Misra, K., Resmi, L., Kann, D.A., Marongiu, M., Moin, A., Klose, S., de Ugarte Postigo, A., Jaiswal, V.K., Perley, D.A., Ghosh, A., Bernardi, G., Schulze, S., Michałowski, M.J., Martín, S., Cockeram, A., Kumar, H., Cherukuri, S.V., Bhalerao, V., Anderson, G.E., Anupama, G.C., xThonë, G.C., Barway, S., Wieringa, M.H., Fynbo, J.P.U., Habeeb, N. arXiv:1911.09719 (2019)
Mirzoyan, R., Noda, K., Moretti, E., Berti, A., Nigro, C., Hoang, J., Micanovic, S., Takahashi, M., Chai, Y., Moralejo, A., and MAGIC Collaboration: . GRB Coordinates Network 23701, 1 (2019)
Mirzoyan, R.: The Astronomer’s Telegram 12390, 1 (2019)
MAGIC Collaboration, Acciari, V.A., Ansoldi, S., Antonelli, L.A., Engels, A.A., Baack, D., Babić, A., Banerjee, B., Barres de Almeida, U., Barrio, J.A., González, J.B., Bednarek, W., Bellizzi, L., Bernardini, E., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Biland, A., Blanch, O., Bonnoli, G., Boŝnjak, ž., Busetto, G., Carosi, R., Ceribella, G., Chai, Y., Ragosta, F., Resmi, L., Ricci, R., Rossi, A., Sánchez-Ramírez, R., et al.: Nature 575(7783), 459 (2019). https://doi.org/10.1038/s41586-019-1754-6
Mirabel, I.F., Rodríguez, L.F.: Nature 371(6492), 46 (1994). https://doi.org/10.1038/371046a0
Fender, R.P., Garrington, S.T., McKay, D.J., Muxlow, T.W.B., Pooley, G.G., Spencer, R.E., Stirling, A.M., Waltman, E.B.: MNRAS 304(4), 865 (1999). https://doi.org/10.1046/j.1365-8711.1999.02364.x
Pooley, G.G., Fender, R.P.: MNRAS 292 (4), 925 (1997). https://doi.org/10.1093/mnras/292.4.925
Eikenberry, S.S., Matthews, K., Morgan, E.H., Remillard, R.A., Nelson, R.W.: Astrophys J. Lett. 494(1), L61 (1998). https://doi.org/10.1086/311158
Egron, E., Pellizzoni, A., Giroletti, M., Righini, S., Stagni, M., Orlati, A., Migoni, C., Melis, A., Concu, R., Barbas, L., Buttaccio, S., Cassaro, P., De Vicente, P., Gawroński, M.P., Lindqvist, M., Maccaferri, M., Stanghellini, C., Wolak, P., Yang, J., Navarrini, A., Loru, S., Pilia, M., Bachetti, M., Iacolina, M.N., Buttu, M., Corbel, S., Rodriguez, J., Markoff, S., Wilms, J., Pottschmidt, K., Cadolle Bel, M., Kalemci, E., Belloni, T., Grinberg, V., Marongiu, M., Vargiu, G.P., Trois, A.: MNRAS 471(3), 2703 (2017). https://doi.org/10.1093/mnras/stx1730
Prandoni, I., Murgia, M., Tarchi, A., Burgay, M., Castangia, P., Egron, E., Govoni, F., Pellizzoni, A., Ricci, R., Righini, S., Bartolini, M., Casu, S., Corongiu, A., Iacolina, M.N., Melis, A., Nasir, F.T., Orlati, A., Perrodin, D., Poppi, S., Trois, A., Vacca, V., Zanichelli, A., Bachetti, M., Buttu, M., Comoretto, G., Concu, R., Fara, A., Gaudiomonte, F., Loi, F., Migoni, C., Orfei, A., Pilia, M., Bolli, P., Carretti, E., D’Amico, N., Guidetti, D., Loru, S., Massi, F., Pisanu, T., Porceddu, I., Ridolfi, A., Serra, G., Stanghellini, C., Tiburzi, C., Tingay, S., Valente, G.: A&A 608, A40 (2017). https://doi.org/10.1051/0004-6361/201630243
Valente, G., Pisanu, T., Bolli, T., Mariotti, S., Marongiu, P., Navarrini, A., Nesti, R., Orfei, A., Roda, J.: The dual-band LP feed system for the Sardinia Radio Telescope prime focus. In: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 7741, p. 774126. (2010), https://doi.org/10.1117/12.857306
Valente G., Orfei, A., Nesti, R., Navarrini, A., Mariotti, S., Bolli, P., Pisanu, T., Roda, J., Cresci, L., Marongiu, P., Scalambra, A., Panella, D., Ladu, A., Cattani, A., Carbonaro, L., Urru, E., Cremonini, A., Fiocchi, F., Maccaferri, F., Morsiani, M., Poloni, M.: Status of the radio receiver system of the Sardina Radio Telescope. In: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 9914, p. 991425. (2016), https://doi.org/10.1117/12.2232880
Orfei, M., Morsiani, M., Zacchiroli, G., Maccaferri, G., Roda, J., Fiocchi, F.: Active surface system for the new Sardinia Radiotelescope. In: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 5495, pp. 116–125 (2004), https://doi.org/10.1117/12.548944
Buttu, M. , Orlati, A., Zacchiroli, G., Morsiani, M., Fiocchi, F., Buffa, F., Maccaferri, G., Vargiu, G.P., Migoni, C., Poppi, S., Righini, S., Melis, A.: Diving into the Sardinia Radio Telescope minor servo system. In: Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, vol. 8451, p. 84512L (2012), https://doi.org/10.1117/12.925387
Bolli, P., Orlati, A., Stringhetti, L., Orfei, A., Righini, S., Ambrosini, R., Bartolini, M., Bortolotti, C., Buffa, F., Buttu, M., Cattani, A., D’Amico, N., Deiana, G., Fara, A., Fiocchi, F., Gaudiomonte, F., Maccaferri, A., Mariotti, S., Marongiu, P., Melis, A., Migoni, C., Morsiani, M., Nanni, M., Nasyr, F., Pellizzoni, A., Pisanu, T., Poloni, M., Poppi, S., Porceddu, I., Prandoni, I., Roda, J., Roma, M., Scalambra, A., Serra, G., Trois, A., Valente, G., Vargiu, G.P., Zacchiroli, G.: Journal of Astronomical Instrumentation 1550008-880, 4 (2015). https://doi.org/10.1142/S2251171715500087
Egron, E., Pellizzoni, A., Iacolina, M.N., Loru, S., Marongiu, M., Righini, S., Cardillo, M., Giuliani, A., Mulas, S., Murtas, G., Simeone, D., Concu, R., Melis, A., Trois, A., Pilia, M., Navarrini, A., Vacca, V., Ricci, R., Serra, G., Bachetti, M., Buttu, M., Perrodin, D., Buffa, F., Deiana, G.L., Gaudiomonte, F., Fara, A., Ladu, A., Loi, F., Marongiu, P., Migoni, C., Pisanu, T., Poppi, S., Saba, A., Urru, E., Valente, G., Vargiu, G.P.: MNRAS 470(2), 1329 (2017). https://doi.org/10.1093/mnras/stx1240
Melis, A., Concu, R., Trois, A., Possenti, A., Bocchinu, A., Bolli, P., Burgay, M., Carretti, E., Castangia, P., Casu, S., Pestellini, C.C., Corongiu, A., D’Amico, N., Egron, E., Govoni, F., Iacolina, M.N., Murgia, M., Pellizzoni, A., Perrodin, D., Pilia, M., Pisanu, T., Poddighe, A., Poppi, S., Porceddu, I., Tarchi, A., Vacca, V., Aresu, G., Bachetti, M., Barbaro, M., Casula, A., Ladu, A., Leurini, S., Loi, F., Loru, S., Marongiu, P., Maxia, P., Mazzarella, G., Migoni, C., Montisci, G., Valente, G., Vargiu, G.: Journal of Astronomical Instrumentation 7(1), 1850004 (2018). https://doi.org/10.1142/S2251171718500046
Robishaw, T., Heiles, C. arXiv:1806.07391 (2018)
Perley, R.A., Butler, B.J.: Astrophys J.s 204(2), 19 (2013). https://doi.org/10.1088/0067-0049/204/2/19
Egron, E., Pellizzoni, A., Iacolina, M.N., et al.: INAF/OAC Internal Report 59 (2016)
An, T., Sharan Salafia, O., Zhang, Y., Ghirland a, G., Giovannini, G., Giroletti, M., Hada, K., Migliori, G., Orienti, M., Sohn, B.W.: East Asia VLBI Network observations of the TeV Gamma-Ray Burst 190114C. Science Bulletin 65(4), 267–271 (2020). https://doi.org/10.1016/j.scib.2019.11.012[http://www.sciencedirect.com/science/article/pii/S2095927319306553]
Nappo, F., Pescalli, A., Oganesyan, G., Ghirlanda, G., Giroletti, M., Melandri, A., Campana, S., Ghisellini, G., Salafia, O.S., D’Avanzo, P., Bernardini, M.G., Covino, S., Carretti, E., Celotti, A., D’Elia, V., Nava, L., Palazzi, E., Poppi, S., Prandoni, I., Righini, S., Rossi, A., Salvaterra, R., Tagliaferri, G., Testa, V., Venturi, T., Vergani, S.D.: A&A 598, A23 (2017). https://doi.org/10.1051/0004-6361/201628801
van Haarlem, M.P., Wise, M.W., Gunst, A.W., Heald, G., McKean, J.P., Hessels, J.W.T., de Bruyn, A.G., Nijboer, R., Swinbank, J., Fallows, R., Brentjens, M., Nelles, A., Beck, R., Falcke, H., Fender, R., Hörandel, J., Koopmans, L.V.E., Mann, G., Miley, G., Röttgering, H., Stappers, B.W., Wijers, R.A.M.J., Zaroubi, S., van den Akker, M., Alexov, A., Anderson, J., Anderson, K., van Ardenne, A., Arts, M., Asgekar, A., Avruch, I.M., Batejat, F., Bähren, L., Bell, M.E., Bell, M.R., van Bemmel, I., Bennema, P., Bentum, M.J., Bernardi, G., Best, P., Bîrzan, L., Bonafede, A., Boonstra, A.J., Braun, R., Bregman, J., Breitling, F., van de Brink, R.H., Broderick, R.H., Broekema, P.C., Brouw, W.N., Brü, ggen, M., Butcher, H.R., van Cappellen, W., Ciardi, B., Coenen, T., Conway, J., Coolen, A., Corstanje, A., Damstra, S., Davies, O., Deller, A.T., Dettmar, R.J., van Diepen, G., Dijkstra, K., Donker, P., Doorduin, P., Dromer, J., Drost, M., van Duin, A., Eislöffel, J., van Enst, J., Ferrari, C., Frieswijk, W., Gankema, H., Garrett, M.A., de Gasperin, F., Gerbers, M., de Geus, E., Grießmeier, J.M., Grit, T., Gruppen, P., Hamaker, J.P., Hassall, T., Hoeft, M., Holties, H.A., Horneffer, A., van der Horst, A., van Houwelingen, A., Huijgen, A., Iacobelli, M., Intema, H., Jackson, N., Jelic, V., de Jong, A., Juette, E., Kant, D., Karastergiou, A., Koers, A., Kollen, H., Kondratiev, V.I., Kooistra, E., Koopman, Y., Koster, A., Kuniyoshi, M., Kramer, M., Kuper, G., Lambropoulos, P., Law, C., van Leeuwen, J., Lemaitre, J., Loose, M., Maat, P., Macario, G., Markoff, S., Masters, J., McFadden, R.A., McKay-Bukowski, D., Meijering, H., Meulman, H., Mevius, M., Middelberg, E., Millenaar, R., Miller-Jones, J.C.A., Mohan, R.N., Mol, J.D., Morawietz, J., Morganti, R., Mulcahy, D.D., Mulder, E., Munk, H., Nieuwenhuis, L., van Nieuwpoort, R., Noordam, J.E., Norden, M., Noutsos, A. , Offringa, A.R., Olofsson, H., Omar, A., Orrú, E., Overeem, R., Paas, H., Pand ey-Pommier, M., Pandey, V.N., Pizzo, R., Polatidis, A., Rafferty, D., Rawlings, S., Reich, W., de Reijer, J.P., Reitsma, J., Renting, G.A., Riemers, P., Rol, E., Romein, J.W., Roosjen, J., Ruiter, M., Scaife, A., van der Schaaf, K., Scheers, B., Schellart, P., Schoenmakers, A., Schoonderbeek, G., Serylak, M., Shulevski, A., Sluman, J., Smirnov, O., Sobey, C. , Spreeuw, H., Steinmetz, M., Sterks, C.G.M., Stiepel, H.J., Stuurwold, K., Tagger, M., Tang, Y., Tasse, C., Thomas, I., Thoudam, S., Toribio, M.C., van der Tol, B., Usov, O., van Veelen, M., van der Veen, A.J., ter Veen, S., Verbiest, J.P.W., Vermeulen, R., Vermaas, N., Vocks, C., Vogt, C., de Vos, M., van der Wal, E., van Weeren, R., Weggemans, H., Weltevrede, P., White, S., Wijnholds, S.J., Wilhelmsson, T., Wucknitz, O., Yatawatta, S., Zarka, P., Zensus, A., van Zwieten, J.: A&A 556, A2 (2013). https://doi.org/10.1051/0004-6361/201220873
Johnston, S., Taylor, R., Bailes, M., Bartel, N., Baugh, C., Bietenholz, M., Blake, C., Braun, R., Brown, J., Chatterjee, S., Darling, J., Deller, A., Dodson, R., Edwards, P., Ekers, R., Ellingsen, S., Feain, I., Gaensler, B., Haverkorn, M., Hobbs, G., Hopkins, A., Jackson, C., James, C., Joncas, G., Kaspi, V., Kilborn, V., Koribalski, B., Kothes, R., Landecker, T., Lenc, E., Lovell, J., Macquart, J.P., Manchester, R., Matthews, D., McClure-Griffiths, N., Norris, R., Pen, U.L., Phillips, C., Power, C., Protheroe, R., Sadler, E., Schmidt, B., Stairs, I., Staveley-Smith, L., Stil, J., Tingay, S., Tzioumis, A., Walker, M., Wall, J., Wolleben, M.: Exp. Astron. 22(3), 151 (2008). https://doi.org/10.1007/s10686-008-9124-7
Acknowledgements
We thank the anonymous referee for helping us improve the paper. The Sardinia Radio Telescope is funded by the Department of University and Research (MIUR), the Italian Space Agency (ASI), and the Autonomous Region of Sardinia (RAS), and is operated as a National Facility by the National Institute for Astrophysics (INAF). M. Marongiu gratefully acknowledges the University of Ferrara for the financial support of his PhD scholarship. We acknowledge the support from PRIN-INAF-2016 “Towards the SKA and CTA era: the discovery, localization, and physics of transient sources”. M. Marongiu thanks P. Bergamini and G. Angora for the useful discussion about Python programming language and data analysis; moreover, M. Marongiu is very grateful to K. D. Alexander for useful conversations. We acknowledge the TAC, the scheduler and the SRT staff for approving and executing these followup campaigns.
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Marongiu, M., Pellizzoni, A., Egron, E. et al. Methods for detection and analysis of weak radio sources with single-dish radio telescopes. Exp Astron 49, 159–182 (2020). https://doi.org/10.1007/s10686-020-09658-9
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DOI: https://doi.org/10.1007/s10686-020-09658-9