The 256-antenna Coherent All-Sky Monitor
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917410709176320 |
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| author | Connor, Liam Ravi, Vikram Sanghavi, Pranav Balakrishan, Vishnu Chung, Luke Daghlian, Saren Dunn, Liam Griffin, Anthony Harnach, Charlie Hodges, Mark Jameson, Andrew Gutierrez, Michael Leung, Calvin Lin, Mei Mehla, Advait Modilim, Obinna Patel, Nimesh Smith, Kendrick Zeng, Lingzhen |
| author_facet | Connor, Liam Ravi, Vikram Sanghavi, Pranav Balakrishan, Vishnu Chung, Luke Daghlian, Saren Dunn, Liam Griffin, Anthony Harnach, Charlie Hodges, Mark Jameson, Andrew Gutierrez, Michael Leung, Calvin Lin, Mei Mehla, Advait Modilim, Obinna Patel, Nimesh Smith, Kendrick Zeng, Lingzhen |
| contents | Radio astronomy is uniquely coupled to exponential trends in computation because the optics (cross-correlation, beamforming, and imaging) and spectrometry (i.e. channelization) can now be done digitally. Inexpensive analog-to-digital converters (ADCs) can sample signals from large numbers of antennas and graphics processing units (GPUs) allow us to coherently process wide-field radio data in real time, motivating large-$N$ aperture arrays at moderate cost. We describe the 256-antenna Coherent All-Sky Monitor (CASM-256), a dense aperture array operating at 375-500\,MHz, currently being deployed at the Owens Valley Radio Observatory (OVRO) in Big Pine, California. The large field-of-view (FoV$\sim10^4$\,deg$^2$) and point-source sensitivity of CASM-256 will allow it to detect local Universe fast radio bursts (FRBs). The nearby sample is ideal for unveiling the physical origin of FRBs, measuring the baryonic content of nearby galaxy halos, and discovering prompt multi-wavelength and multi-messenger counterparts to FRBs. CASM will search for fast transients in the Milky Way such as FRB analogs, pulsar giant pulses, and the new source class known as long-period radio transients. We describe the instrument and present on-sky data from the first two dozen antennas, including an operational real-time GPU based FRB search pipeline. We emphasize the scalability of the concept and describe paths to a future CASM array with tens of thousands of antennas that could detect one million FRBs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_13903 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The 256-antenna Coherent All-Sky Monitor Connor, Liam Ravi, Vikram Sanghavi, Pranav Balakrishan, Vishnu Chung, Luke Daghlian, Saren Dunn, Liam Griffin, Anthony Harnach, Charlie Hodges, Mark Jameson, Andrew Gutierrez, Michael Leung, Calvin Lin, Mei Mehla, Advait Modilim, Obinna Patel, Nimesh Smith, Kendrick Zeng, Lingzhen Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena Radio astronomy is uniquely coupled to exponential trends in computation because the optics (cross-correlation, beamforming, and imaging) and spectrometry (i.e. channelization) can now be done digitally. Inexpensive analog-to-digital converters (ADCs) can sample signals from large numbers of antennas and graphics processing units (GPUs) allow us to coherently process wide-field radio data in real time, motivating large-$N$ aperture arrays at moderate cost. We describe the 256-antenna Coherent All-Sky Monitor (CASM-256), a dense aperture array operating at 375-500\,MHz, currently being deployed at the Owens Valley Radio Observatory (OVRO) in Big Pine, California. The large field-of-view (FoV$\sim10^4$\,deg$^2$) and point-source sensitivity of CASM-256 will allow it to detect local Universe fast radio bursts (FRBs). The nearby sample is ideal for unveiling the physical origin of FRBs, measuring the baryonic content of nearby galaxy halos, and discovering prompt multi-wavelength and multi-messenger counterparts to FRBs. CASM will search for fast transients in the Milky Way such as FRB analogs, pulsar giant pulses, and the new source class known as long-period radio transients. We describe the instrument and present on-sky data from the first two dozen antennas, including an operational real-time GPU based FRB search pipeline. We emphasize the scalability of the concept and describe paths to a future CASM array with tens of thousands of antennas that could detect one million FRBs. |
| title | The 256-antenna Coherent All-Sky Monitor |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2604.13903 |