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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"

56 results found.

  1. IceCube-260610A - IceCube observation of a high-energy neutrino candidate track-like event
  2. Fermi GRB 251006B: Global MASTER-Net observations report
  3. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  4. GRB 241113A: KAIT optical observations
  5. Fermi-LAT gamma-ray observations of IceCube-240808A
  6. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  7. Fermi trigger No 732299243: Global MASTER-Net observations report
  8. LIGO/Virgo/KAGRA S231008ap: Identification of a GW compact binary merger candidate
  9. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  10. Fermi trigger No 675411172: Global MASTER-Net observations report
  11. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  12. Fermi-LAT Gamma-ray Observations of IceCube-211023A
  13. IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
  14. Fermi-LAT Gamma-ray Observations of IceCube-210730A
  15. Fermi GRB 210615A: Global MASTER-Net observations report
  16. Fermi-LAT Gamma-ray Observations of IceCube-201120A
  17. AX J1846.4-0258: Swift-BAT refined analysis
  18. Swift Detection of an SGR-like flare from AX J1846.4-0258
  19. Swift-XRT observations of IceCube 200615A
  20. Fermi-LAT ANTARES 200127.79 coincidence: MASTER alert observation and presence of young pulsar close to error-box
  21. LIGO/Virgo S191110af: Potential pulsar counterparts
  22. Fermi-LAT Gamma-ray Observations of IceCube-191001A
  23. Trigger 896552: Swift detection of PSR B1055-52
  24. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  25. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  26. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  27. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  28. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  29. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  30. GRB 170519A: iTelescope T11 optical observations
  31. Swift Trigger on AXP CXOU J164710.2-455216
  32. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  33. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  34. SGR 1935+2154: AbAO optical upper limit
  35. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  36. GRB 120927A: Swift/UVOT Upper Limits
  37. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  38. Swift detection of short bursts from PSR J1647-4552
  39. SGR J1834.9-0846: A Neutron Star in W41?
  40. Swift J1822.3-1606
  41. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  42. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  43. GRB 100116A: Suzaku WAM observation of the prompt emission
  44. GRB 070223: Optical Observations
  45. VLA observation of GRB 070223
  46. GRB 070223: Swift-XRT Refined Analysis
  47. GRB 051221: Swift/UVOT upper limits
  48. GRB050701: Swift-BAT Refined analysis
  49. Swift trigger 143708 is really GRB 050701
  50. The Radio Afterglow from the X-ray Rich GRB 011030
  51. GRB 011030, WSRT radio observations
  52. GRB011030 - further refinement WFC position
  53. GRB011030: radio search
  54. GRB 011030, R-band observations
  55. BeppoSAX ALERT: Possible X-ray rich GRB011030
  56. GRB990123, 15-GHz limits

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