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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"

4258 results found.

  1. GRB 241013A: Fermi GBM Observation
  2. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  3. GRB 241009A : Detection of a long duration GRB by SVOM/ECLAIRs
  4. LIGO/Virgo/KAGRA S241007bw: Identification of a GW compact binary merger candidate
  5. LIGO/Virgo/KAGRA S241006k: Identification of a GW compact binary merger candidate
  6. GRB 241002C: X-ray afterglow candidate observed by SVOM/MXT
  7. GRB 240929A: SAO RAS, Mondy, and CrAO optical observations
  8. Fermi GRB 241002B: Global MASTER-Net observations report
  9. GRB 241001A: Swift-XRT observations
  10. GRB 240929A: GRBAlpha detection
  11. Fermi-LAT Gamma-ray Observations of IceCube-240929A
  12. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  13. IceCube-240929A: Upper limits from a search for additional neutrino events in IceCube
  14. LIGO/Virgo/KAGRA S240930df: 1 counterpart neutrino candidate event from an IceCube neutrino search
  15. GRB 240929A : Leavitt Observatory optical upper limit
  16. Fermi GRB 240930B: Global MASTER-Net observations report
  17. Fermi GRB 240930A: Global MASTER-Net observations report
  18. Fermi trigger No 749339671: Global MASTER-Net observations report
  19. Fermi Gamma-ray Burst Monitor trigger 749339671/240929913 is not a GRB
  20. GRB 240929A long GRB detected by INTEGRAL
  21. GRB 240929A: BALROG localization (Fermi Trigger 749332209 / GRB 240929826)
  22. Fermi GRB 240929A: Global MASTER-Net observations report
  23. GRB 240929A: Fermi GBM Final Real-time Localization
  24. Integral GRB240929.83: Global MASTER-Net observations report
  25. IceCube-240929A - IceCube observation of a high-energy neutrino candidate track-like event
  26. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  27. EP240913a/GRB 240913C: 1.6m Mephisto observations
  28. EP240918a: SVOM/VT upper limit
  29. LIGO/Virgo/KAGRA S240920dw: Identification of a GW compact binary merger candidate
  30. GRB 240821A: radio observation with the VLA
  31. LIGO/Virgo/KAGRA S240915b: Identification of a GW compact binary merger candidate
  32. EP240913a: JinShan optical upper limits
  33. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  34. Fermi trigger No 747553301: Global MASTER-Net observations report
  35. GRB 240905B: GOTO optical upper limits
  36. GRB 240905E: Swift detection of a burst
  37. Fermi GRB 240905B: Global MASTER-Net observations report
  38. LIGO/Virgo/KAGRA S240902bq: Identification of a GW compact binary merger candidate
  39. Fermi trigger No 746923430: Global MASTER-Net observations report
  40. GRB 240828A: SAO RAS AS-500(2) optical observations
  41. GRB 240829B: GRBAlpha detection
  42. GRB 240828B: AbAO optical upper limit
  43. GRB 240828B: GRANDMA Optical Upper Limit
  44. GRB 240825A: MeerKAT detection
  45. GRB 240828B: SAO RAS optical upper limit
  46. GRB 240828A: SAO RAS optical observations
  47. Fermi trigger No 746587425: Global MASTER-Net observations report
  48. GRB 240829B: Fermi GBM Final Localization
  49. GRB 240629A: First GRB Detected by BurstCube
  50. GRB 240828A: KAIT Optical Afterglow Candidate
  51. Swift GRB240829.16: Global MASTER-Net observations report
  52. LAT GRB240828.62: Global MASTER-Net observations report
  53. Fermi trigger No 746438824: Global MASTER-Net observations report
  54. GRB 240825A: SAO RAS optical observations
  55. GRB 240824A: GIT optical upper limit
  56. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  57. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  58. Fermi GRB 240825A: Global MASTER-Net observations report
  59. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  60. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  61. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  62. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  63. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  64. Fermi trigger No 745866488: Global MASTER-Net observations report
  65. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  66. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  67. GRB 240819A: X-ray follow-up observation with EP-FXT
  68. EP240816b: Liverpool Telescope optical follow-up observations
  69. EP EP240816b: Global MASTER-Net observations report
  70. Fermi GRB 240814C: Global MASTER-Net observations report
  71. Fermi trigger No 745306088: Global MASTER-Net observations report
  72. Fermi GRB 240814B: Global MASTER-Net observations report
  73. Fermi GRB 240810A: Global MASTER-Net observations report
  74. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  75. EP EP240807a: Global MASTER-Net observations report
  76. EP EP240806a: Global MASTER-Net observations report
  77. Fermi trigger No 744761058: Global MASTER-Net observations report
  78. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  79. EP240806A: Liverpool Telescope optical follow-up observations
  80. Fermi trigger No 744629911: Global MASTER-Net observations report
  81. Konus-Wind detection of GRB 240802A (EP240802a)
  82. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  83. Fermi trigger No 744544656: Global MASTER-Net observations report
  84. GRB 240802A: AstroSat CZTI detection of a long burst
  85. Fermi trigger No 744128417: Global MASTER-Net observations report
  86. Fermi trigger No 743953682: Global MASTER-Net observations report
  87. Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB
  88. Fermi GRB 240727A: Global MASTER-Net observations report
  89. GRB 240718A: GRBAlpha detection
  90. GRB 240627A: GRBAlpha detection
  91. Fermi GRB 240726A: Global MASTER-Net observations report
  92. Fermi trigger No 743345551: Global MASTER-Net observations report
  93. Fermi trigger No 743219692: Global MASTER-Net observations report
  94. Swift GRB240720.02: Global MASTER-Net observations report
  95. Konus-Wind detection of GRB 240718A
  96. Fermi GRB 240718A: Global MASTER-Net observations report
  97. GRB 240718A: Fermi GBM Observation
  98. IceCube-Cascade 240714A: TRT optical observations on the EP/FXT positions
  99. GRB 240718A: Fermi-LAT Detection
  100. GRB 240718A: SVOM/GRM observation

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