FIRST J141918.9+394036 has been reported as a slowly-evolving extragalactic radio transient (Law et al. 2018, arXiv:1808.08964), consistent with a fading orphan long gamma-ray burst (LGRB)

Hessels, J.W.T.

Marcote, B.

Paragi, Z.

English

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First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scales

International Migration, Integration and Social Cohesion online publications

UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)First EVN measurements of the transient FIRST J141918.9+394036 onmilliarcsecond scalesMarcote, B.; Paragi, Z.; Hessels, J.W.T.Publication date2018Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Marcote, B., Paragi, Z., & Hessels, J. W. T. (2018). First EVN measurements of the transientFIRST J141918.9+394036 on milliarcsecond scales. The astronomer's telegram, 2126.http://www.astronomerstelegram.org/?read=12126General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s)and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an opencontent license (like Creative Commons).Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, pleaselet the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the materialinaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letterto: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. Youwill be contacted as soon as possible.Download date:15 Apr 2023ATel #12126: First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scaleshttp://www.astronomerstelegram.org/?read=12126[19-2-2019 11:06:49]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email19 Feb 2019; 10:07 UTThis space for free for your conference.[ Previous | Next | ADS  ]First EVN measurements of the transient FIRSTJ141918.9+394036 on milliarcsecond scalesATel #12126; B. Marcote (JIVE), Z. Paragi (JIVE), J. W. T. Hessels (ASTRON/UvA)on 18 Oct 2018; 11:36 UTCredential Certification: Benito Marcote (marcote@jive.eu)Subjects: Radio, Gamma-Ray Burst, TransientFIRST J141918.9+394036 has been reported as a slowly-evolving extragalactic radio transient(Law et al. 2018, arXiv:1808.08964), consistent with a fading orphan long gamma-ray burst(LGRB).Here we report observations performed at 1.6 GHz with the European VLBI Network in real time(e-EVN) on 18 September 2018 from 12:00 to 19:00 UTC. These observations providemilliarcsecond resolution (the synthesized beam is 5.0 x 7.3 mas with a position angle of 75degrees) with an rms noise level of 45 μJy/beam.We detected radio emission with a flux density of approximately 520 μJy, at a best-fit position of:ra = 14h19m18.85075(5)sdec = +39d40'36.0492(4)''This is consistent in flux density and position with the source reported in Law et al. (2018,arXiv:1808.08964).We constrain the source size to be approximately less than or equal to 4 mas, by using modelfit inthe uv-plane with a circular Gaussian. Given the distance to FIRST J141918.9+394036 of 87 Mpc(Law et al. 2018, arXiv:1808.08964), the constraint on the angular size implies a physical size of< 1.7 pc. These results will be used to help distinguish between GRB and magnetar models.Additional technical details: The observation was conducted at a bitrate of 1024 Mbps, with atotal bandwidth of 128 MHz divided into 8 IFs of 64 channels each. The total on-source time was4.8 h. J1419+3821 was used as phase calibrator in a phase-reference cycle of 4.5 min on targetand 1.5 min on calibrator. The participating telescopes were Effelsberg (Germany), WesterborkSingle Telescope (Netherlands), Jodrell Bank Mk2 Telescope (UK), Medicina (Italy), Onsala(Sweden), Tianma (China), Torun (Poland), Hartebeesthoek (South Africa), Sardinia (Italy), andCambridge, Defford, Knockin from e-MERLIN (UK).Acknowledgements: We thank the EVN PC for approving the 7-hr e-EVN ToO observationsduring the e-EVN session. The European VLBI Network (EVN) is a joint facility of independentEuropean, African, Asian, and North American radio astronomy institutes. The observationsATel #12126: First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scaleshttp://www.astronomerstelegram.org/?read=12126[19-2-2019 11:06:49]presented here were obtained under the project code RM015. e-MERLIN is a National Facilityoperated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC.[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorMansi M. Kasliwal, Co-Editor

UvA-DARE

UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)First EVN measurements of the transient FIRST J141918.9+394036 onmilliarcsecond scalesMarcote, B.; Paragi, Z.; Hessels, J.W.T.Publication date2018Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Marcote, B., Paragi, Z., & Hessels, J. W. T. (2018). First EVN measurements of the transientFIRST J141918.9+394036 on milliarcsecond scales. The astronomer's telegram, 2126.http://www.astronomerstelegram.org/?read=12126General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s)and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an opencontent license (like Creative Commons).Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, pleaselet the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the materialinaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letterto: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. Youwill be contacted as soon as possible.Download date:11 Feb 2023ATel #12126: First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scaleshttp://www.astronomerstelegram.org/?read=12126[19-2-2019 11:06:49]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email19 Feb 2019; 10:07 UTThis space for free for your conference.[ Previous | Next | ADS  ]First EVN measurements of the transient FIRSTJ141918.9+394036 on milliarcsecond scalesATel #12126; B. Marcote (JIVE), Z. Paragi (JIVE), J. W. T. Hessels (ASTRON/UvA)on 18 Oct 2018; 11:36 UTCredential Certification: Benito Marcote (marcote@jive.eu)Subjects: Radio, Gamma-Ray Burst, TransientFIRST J141918.9+394036 has been reported as a slowly-evolving extragalactic radio transient(Law et al. 2018, arXiv:1808.08964), consistent with a fading orphan long gamma-ray burst(LGRB).Here we report observations performed at 1.6 GHz with the European VLBI Network in real time(e-EVN) on 18 September 2018 from 12:00 to 19:00 UTC. These observations providemilliarcsecond resolution (the synthesized beam is 5.0 x 7.3 mas with a position angle of 75degrees) with an rms noise level of 45 μJy/beam.We detected radio emission with a flux density of approximately 520 μJy, at a best-fit position of:ra = 14h19m18.85075(5)sdec = +39d40'36.0492(4)''This is consistent in flux density and position with the source reported in Law et al. (2018,arXiv:1808.08964).We constrain the source size to be approximately less than or equal to 4 mas, by using modelfit inthe uv-plane with a circular Gaussian. Given the distance to FIRST J141918.9+394036 of 87 Mpc(Law et al. 2018, arXiv:1808.08964), the constraint on the angular size implies a physical size of< 1.7 pc. These results will be used to help distinguish between GRB and magnetar models.Additional technical details: The observation was conducted at a bitrate of 1024 Mbps, with atotal bandwidth of 128 MHz divided into 8 IFs of 64 channels each. The total on-source time was4.8 h. J1419+3821 was used as phase calibrator in a phase-reference cycle of 4.5 min on targetand 1.5 min on calibrator. The participating telescopes were Effelsberg (Germany), WesterborkSingle Telescope (Netherlands), Jodrell Bank Mk2 Telescope (UK), Medicina (Italy), Onsala(Sweden), Tianma (China), Torun (Poland), Hartebeesthoek (South Africa), Sardinia (Italy), andCambridge, Defford, Knockin from e-MERLIN (UK).Acknowledgements: We thank the EVN PC for approving the 7-hr e-EVN ToO observationsduring the e-EVN session. The European VLBI Network (EVN) is a joint facility of independentEuropean, African, Asian, and North American radio astronomy institutes. The observationsATel #12126: First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scaleshttp://www.astronomerstelegram.org/?read=12126[19-2-2019 11:06:49]presented here were obtained under the project code RM015. e-MERLIN is a National Facilityoperated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC.[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorMansi M. Kasliwal, Co-Editor

First EVN measurements of the transient FIRST J141918.9+394036 on milliarcsecond scales

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International Migration, Integration and Social Cohesion online publications