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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

1461 results found.

  1. Fermi-LAT Gamma-ray Observations of IceCube-170321
  2. IceCube-170321A: Swift-XRT observations
  3. INTEGRAL pointed follow-up of IceCube-170321A
  4. Fermi GBM Observation of IceCube-170321A
  5. IceCube-170321A - IceCube observation of a high-energy neutrino candidate event
  6. INTEGRAL SPI-ACS observation of AMON IceCube EHE 80305071 129307
  7. Search for counterpart to IceCube-170321A with ANTARES
  8. IceCube-170312A: MASTER follow-up observations
  9. IceCube-170312A: Swift-XRT observations
  10. LIGO/Virgo G277583: IceCube neutrino observations
  11. IceCube-170312A - IceCube update on a high-energy neutrino candidate event
  12. INTEGRAL observation of IceCube HESE 65274589 129281
  13. LIGO/Virgo G275697: IceCube neutrino observations
  14. LIGO/Virgo G275404: IceCube neutrino observations
  15. LIGO/Virgo G274296: IceCube neutrino observations
  16. Fermi-LAT Gamma-ray Observations of IceCube-161210
  17. IceCube-161210: Kanata/HONIR near-infrared follow-up observation
  18. IceCube-161210: Konus-Wind upper limits
  19. IceCube-161210: CALET Gamma-Ray Burst Monitor upper limits
  20. HAWC follow-up on IceCube-161210
  21. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161210
  22. IceCube-161210: MAXI/GSC non-detection
  23. IceCube-161210: IceCube observation of a high-energy neutrino candidate event
  24. IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
  25. Fermi LAT Gamma-ray Observations of IceCube-161103
  26. GRB 161103A: an ultra-long GRB detected by Konus-Wind
  27. IceCube-161103: Konus-Wind upper limits
  28. Search for counterpart to IceCube-161103A with ANTARES
  29. Fermi GBM Observations of IceCube-161103
  30. IceCube-161103: Swift-XRT observations
  31. INTEGRAL SPI-ACS and IBIS/Veto observation of IceCube-161103
  32. IceCube-161103: MASTER follow-up observations
  33. HAWC follow up of IceCube-161103
  34. IceCube-161103: IceCube observation of a very-high-energy neutrino
  35. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  36. Search for counterpart to IceCube-160814A with ANTARES
  37. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  38. Fermi GBM Observations of IceCube-160806A
  39. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  40. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
  41. IceCube 160806A EHE Neutrino Candidate Event
  42. IceCube-160731A: Konus-Wind limits
  43. Search for counterpart to IceCube-160731A with ANTARES
  44. IceCube-160731A: iPTF P48 Observations
  45. GBM Observations of IceCube 160731
  46. FACT follow-up of IceCube20160731
  47. Global MASTER net follow up of IceCube-160731A
  48. Swift follow up of IceCube-160731A
  49. HAWC follow up of IceCube 160731
  50. FACT follow-up of the IceCube event 160427A
  51. Interplanetary Network Search for IceCube 160427A
  52. IceCube-160427A: iPTF Observations
  53. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  54. VERITAS rapid follow-up observations of IceCube event 160427A
  55. IceCube-160427A: Fermi GBM Observations
  56. ICECUBE-160427A neutrino candidate event: updated direction information
  57. MASTER search for counterpart to the IceCube event 67093193 (run 127853)
  58. Archival observations by HAWC of IceCube HESE event of April 27, 2016
  59. Fermi/LAT search for counterpart to the IceCube event 67093193 (run 127853)
  60. GRB 130427A: High-energy neutrino search
  61. GRB 080319B: IceCube upper limit on high-energy neutrino flux

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