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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

24511 results found.

  1. Swift GRB 240805B: Global MASTER-Net observations report
  2. Fermi GRB 240805A: Global MASTER-Net observations report
  3. Swift GRB 240805A: Global MASTER-Net observations report
  4. GRB 240805A: Fermi-LAT detection
  5. EP-WXT trigger 00109017646 is not a real source
  6. EP240802a: correction of EP-WXT trigger time in GCN 37019
  7. GRB 240805A: Swift detection of a burst
  8. GRB 240805A: Fermi GBM Final Real-time Localization
  9. Fermi GRB 240804A: Global MASTER-Net observations report
  10. GRB 240804A: Fermi GBM Final Real-time Localization
  11. Fermi trigger No 744459130: Global MASTER-Net observations report
  12. IPN triangulation of GRB 240802A / EP 240802a
  13. GRB 240802A: SVOM/GRM observation
  14. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  15. Fermi trigger No 744278264: Global MASTER-Net observations report
  16. GRB 240802A: AstroSat CZTI detection of a long burst
  17. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  18. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  19. GRB 240727C: SVOM/GRM observation
  20. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  21. GRB 240730A: Swift-BAT refined analysis
  22. Fermi trigger No 744204856: Global MASTER-Net observations report
  23. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  24. Fermi GRB 240801A: Global MASTER-Net observations report
  25. GRB 240801A: Fermi GBM Final Real-time Localization
  26. GRB 240731A: Fermi GBM Final Localization
  27. Fermi trigger No 744128417: Global MASTER-Net observations report
  28. Fermi trigger No 744083370: Global MASTER-Net observations report
  29. Fermi GRB 240730B: Global MASTER-Net observations report
  30. GRB 240730B: Fermi GBM Final Real-time Localization
  31. Swift GRB 240730A: Global MASTER-Net observations report
  32. GRB 240715A: Swift-XRT afterglow detection
  33. GRB 240727C: GRBAlpha detection
  34. Fermi trigger No 743953682: Global MASTER-Net observations report
  35. GRB 240727A: Swift-BAT refined analysis
  36. Fermi GRB 240727A: Global MASTER-Net observations report
  37. Fermi trigger No 743868421: Global MASTER-Net observations report
  38. GRB 240727A: Correction to time in GCN36960
  39. EP-WXT trigger 01709002661 is not a real source
  40. GRB 240727A: NOT optical observation
  41. GRB 240727A: Fermi GBM Final Real-time Localization
  42. GRB 240720B: GRBAlpha detection
  43. GRB 240718A: GRBAlpha detection
  44. GRB 240710B: GRBAlpha detection
  45. GRB 240627A: GRBAlpha detection
  46. Fermi GRB 240726A: Global MASTER-Net observations report
  47. GRB 240727B: Fermi GBM Observation
  48. Swift GRB240727.16: Global MASTER-Net observations report
  49. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  50. GRB 240726A: SVOM/GRM observation
  51. GRB 240727A: KAIT Optical Afterglow Candidate
  52. GRB 240726A: AstroSat CZTI detection of a short burst
  53. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  54. GRB 240726A: Fermi GBM Final Real-time Localization
  55. Fermi-LAT gamma-ray observations of IceCube-240725A
  56. IceCube Alert 240725.22: Global MASTER-Net observations report
  57. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  58. Swift GRB240725.11: Global MASTER-Net observations report
  59. IceCube-240721A: Two candidates from the Zwicky Transient Facility
  60. GRB 240720A: Swift-BAT refined analysis
  61. IceCube-240721A: Upper limits from a search for additional neutrino events in IceCube
  62. Fermi trigger No 743418632: Global MASTER-Net observations report
  63. Fermi trigger No 743315411: Global MASTER-Net observations report
  64. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  65. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  66. Fermi trigger No 743345551: Global MASTER-Net observations report
  67. Fermi-LAT gamma-ray observations of IceCube-240721A
  68. Fermi trigger No 743219692: Global MASTER-Net observations report
  69. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  70. IceCube Alert 240721.68: Global MASTER-Net observations report
  71. GRB 240720B: SVOM/GRM observation
  72. GRB 240721A: Fermi GBM Final Real-time Localization
  73. Fermi GRB 240720A: Global MASTER-Net observations report
  74. GRB 240720A: Fermi GBM observation
  75. Swift GRB240720.02: Global MASTER-Net observations report
  76. Konus-Wind detection of GRB 240718A
  77. Fermi GRB 240718A: Global MASTER-Net observations report
  78. LAT GRB240718.27: Global MASTER-Net observations report
  79. GRB 240718A: Fermi GBM Observation
  80. IceCube-Cascade 240714A: TRT optical observations on the EP/FXT positions
  81. GRB 240718A: Fermi-LAT Detection
  82. GRB 240718A: SVOM/GRM observation
  83. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  84. GRB 240718A: Fermi GBM Final Real-time Localization
  85. GRB 240712A: Swift-BAT refined analysis
  86. GRB 240716A: GECAM-B detection of a long burst
  87. SVOM/GRM In-Flight Trigger of GRB 240716A
  88. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  89. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  90. GRB 240715A: Swift-XRT observations
  91. GRB 240715A: GECAM-C detection of a short burst
  92. Konus-Wind detection of GRB 240715A
  93. LIGO/Virgo/KAGRA S240716b: Updated Sky localization
  94. GRB 240713A: Swift-XRT observations
  95. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  96. SVOM/GRM In-Flight Trigger of GRB 240715A
  97. GRB 240713A: LAST optical upper limit
  98. LIGO/Virgo/KAGRA S240716b: Identification of a GW compact binary merger candidate
  99. Fermi GRB 240715A: Global MASTER-Net observations report
  100. GRB 240715A: Fermi GBM Observation

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