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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').
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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.

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

58 results found.

  1. GRB 260317A: SVOM/ECLAIRs detection through offline targeted search and its possible association to magnetar 1E 1841-04.5
  2. Fermi-LAT Gamma-ray Observations of IceCube-260610A
  3. IceCube-260610A - IceCube observation of a high-energy neutrino candidate track-like event
  4. Fermi GRB 251006B: Global MASTER-Net observations report
  5. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  6. GRB 241113A: KAIT optical observations
  7. Fermi-LAT gamma-ray observations of IceCube-240808A
  8. LIGO/Virgo/KAGRA S240527fv: Updated Sky localization
  9. Fermi trigger No 732299243: Global MASTER-Net observations report
  10. LIGO/Virgo/KAGRA S231008ap: Identification of a GW compact binary merger candidate
  11. IceCube-230708A - IceCube observation of a high-energy neutrino candidate track-like event
  12. Fermi trigger No 675411172: Global MASTER-Net observations report
  13. IceCube-220221A - IceCube observation of a high-energy neutrino candidate track-like event
  14. Fermi-LAT Gamma-ray Observations of IceCube-211023A
  15. IceCube-211023A - IceCube observation of a high-energy neutrino candidate track-like event
  16. Fermi-LAT Gamma-ray Observations of IceCube-210730A
  17. Fermi GRB 210615A: Global MASTER-Net observations report
  18. Fermi-LAT Gamma-ray Observations of IceCube-201120A
  19. AX J1846.4-0258: Swift-BAT refined analysis
  20. Swift Detection of an SGR-like flare from AX J1846.4-0258
  21. Swift-XRT observations of IceCube 200615A
  22. Fermi-LAT ANTARES 200127.79 coincidence: MASTER alert observation and presence of young pulsar close to error-box
  23. LIGO/Virgo S191110af: Potential pulsar counterparts
  24. Fermi-LAT Gamma-ray Observations of IceCube-191001A
  25. Trigger 896552: Swift detection of PSR B1055-52
  26. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  27. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  28. Fermi-LAT Gamma-ray Observations of IceCube-171106A
  29. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  30. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  31. Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
  32. GRB 170519A: iTelescope T11 optical observations
  33. Swift Trigger on AXP CXOU J164710.2-455216
  34. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  35. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  36. SGR 1935+2154: AbAO optical upper limit
  37. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  38. GRB 120927A: Swift/UVOT Upper Limits
  39. GRB 120226A: Fermi-GBM and Fermi-LAT detections; LAT position retraction
  40. Swift detection of short bursts from PSR J1647-4552
  41. SGR J1834.9-0846: A Neutron Star in W41?
  42. Swift J1822.3-1606
  43. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  44. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  45. GRB 100116A: Suzaku WAM observation of the prompt emission
  46. GRB 070223: Optical Observations
  47. VLA observation of GRB 070223
  48. GRB 070223: Swift-XRT Refined Analysis
  49. GRB 051221: Swift/UVOT upper limits
  50. GRB050701: Swift-BAT Refined analysis
  51. Swift trigger 143708 is really GRB 050701
  52. The Radio Afterglow from the X-ray Rich GRB 011030
  53. GRB 011030, WSRT radio observations
  54. GRB011030 - further refinement WFC position
  55. GRB011030: radio search
  56. GRB 011030, R-band observations
  57. BeppoSAX ALERT: Possible X-ray rich GRB011030
  58. GRB990123, 15-GHz limits

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