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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"

5173 results found.

  1. GRB 240828A: Swift-XRT afterglow detection
  2. GRB 240828B: Swift-XRT afterglow detection
  3. Swift GRB240829.16: Global MASTER-Net observations report
  4. GRB 240825A: Upper limits from a neutrino search with IceCube
  5. Fermi trigger No 746438824: Global MASTER-Net observations report
  6. GRB 240824A: GIT optical upper limit
  7. GRB 240825A: Swift-XRT refined Analysis
  8. GRB 240824B: Fermi GBM Observation
  9. GRB 240824A: SVOM/C-GFT optical upper limit
  10. Fermi GRB 240824C: Global MASTER-Net observations report
  11. GRB 240824C: Fermi GBM Final Localization
  12. GRB 240824B: MAXI/GSC detection
  13. GRB 240824B: Fermi GBM Final Real-time Localization
  14. GRB 240824A: Retraction of GCN 37255
  15. GRB 240824A: Skynet Optical Afterglow Discovery
  16. Swift GRB240824.04: Global MASTER-Net observations report
  17. Fermi GRB 240821A: Global MASTER-Net observations report
  18. GRB240821A: EIRSAT-1 GMOD Detection
  19. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  20. Fermi GRB 240821B: Global MASTER-Net observations report
  21. GRB 240821B: Fermi GBM Final Localization
  22. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  23. Fermi trigger No 745873283: Global MASTER-Net observations report
  24. Fermi trigger No 745871958: Global MASTER-Net observations report
  25. IceCube-240721A: AT2023qqp and AT2024pge likely unrelated
  26. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  27. Fermi trigger No 745501396: Global MASTER-Net observations report
  28. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  29. GRB 240811A: Swift-XRT refined Analysis
  30. Fermi trigger No 745057312: Global MASTER-Net observations report
  31. GRB 240808A: AstroSat CZTI detection
  32. GRB 240809A: Swift-XRT refined Analysis
  33. GRB 240807B: AstroSat CZTI detection of a short burst
  34. EP EP240807a: Global MASTER-Net observations report
  35. EP EP240806a: Global MASTER-Net observations report
  36. Fermi trigger No 744761058: Global MASTER-Net observations report
  37. Fermi trigger No 744629911: Global MASTER-Net observations report
  38. GRB 240624B: VZLUSAT-2 detection
  39. GRB 240619C: VZLUSAT-2 detection
  40. GRB 240805B: Swift-XRT refined Analysis
  41. GRB 240805A: Swift-XRT refined Analysis
  42. GRB 240805B: Swift detection of a burst
  43. Fermi GRB 240804A: Global MASTER-Net observations report
  44. Fermi GRB 240801A: Global MASTER-Net observations report
  45. GRB 240730A: Swift-XRT refined Analysis
  46. Fermi trigger No 743953682: Global MASTER-Net observations report
  47. GRB 240727A: Swift-XRT refined Analysis
  48. GRB 240726B: AstroSat CZTI detection of a short burst
  49. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  50. Fermi trigger No 743219692: Global MASTER-Net observations report
  51. GRB 240720A: AstroSat CZTI detection
  52. GRB 240720A: Fermi GBM observation
  53. GRB 240720A: Swift detection of a burst
  54. Fermi GRB 240718A: Global MASTER-Net observations report
  55. LAT GRB240718.27: Global MASTER-Net observations report
  56. Konus-Wind detection of GRB 240715A
  57. GRB240715A: GRANDMA Optical Upper Limits
  58. JinShan confirmation of the EP-WXT source triggered on July 14th due to a flaring star
  59. EP240703b: GSP optical upper limit
  60. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  61. GRB 240705A: Fermi GBM Final Real-time Localization
  62. EP240703b: EP-WXT detection of a fast X-ray transient
  63. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  64. GRB 240624B: GRBAlpha detection
  65. GRB240624A: Fermi GBM Observation
  66. Swift GRB 240624A: Global MASTER-Net observations report
  67. Fermi GRB 240624A: Global MASTER-Net observations report
  68. GRB 240624B: Fermi GBM Final Real-time Localization
  69. Fermi trigger No 740949590: Global MASTER-Net observations report
  70. GRB 240624A: Fermi GBM Final Real-time Localization
  71. LIGO/Virgo S240615dg: Swift XRT observations, 39 X-ray sources
  72. Fermi trigger No 740430582: Global MASTER-Net observations report
  73. GRB240615A: 1.3m DFOT optical upper limit
  74. Fermi trigger No 740221779: Global MASTER-Net observations report
  75. GRB 240612A: Fermi GBM Final Real-time Localization
  76. Konus-Wind detection of GRB 240607A
  77. Fermi GRB 240610A: Global MASTER-Net observations report
  78. IPN triangulation of GRB 240607A
  79. Fermi GRB 240607A: Global MASTER-Net observations report
  80. GRB 240606B: Swift-XRT afterglow detection
  81. Fermi GRB 240604A: Global MASTER-Net observations report
  82. GRB 240605C: Fermi GBM Final Real-time Localization
  83. Fermi GRB 240602A: Global MASTER-Net observations report
  84. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  85. GRB 240529A: AKO Optical Afterglow Detection
  86. LIGO/Virgo/KAGRA S240530a: Identification of a GW compact binary merger candidate
  87. LIGO/Virgo S240527fv: GRANDMA/FRAM-Auger Optical Observations
  88. LAT GRB240527.59: Global MASTER-Net observations report
  89. Fermi GRB 240527B: Global MASTER-Net observations report
  90. GRB 240527A: Fermi GBM Final Real-time Localization
  91. Fermi trigger No 738348224: Global MASTER-Net observations report
  92. Fermi trigger No 738330463: Global MASTER-Net observations report
  93. GRB 240523A: Swift-XRT refined Analysis
  94. GRB 240513A: Swift-XRT afterglow detection
  95. Fermi trigger No 737996942: Global MASTER-Net observations report
  96. GRB 240504A: VZLUSAT-2 detection
  97. Fermi trigger No 737788024: Global MASTER-Net observations report
  98. Fermi GRB 240517A: Global MASTER-Net observations report
  99. GRB 240516A ATCA radio observations
  100. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate

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