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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"

5859 results found.

  1. GRB 100514A: optical afterglow confirmation
  2. GRB 100514A: Enhanced Swift-XRT position
  3. GRB 100514A: Swift detection of a burst
  4. GRB 100513A: Swift detection of a burst
  5. GRB 100510A: MAXI/GSC detection
  6. GRB 100508A: ROTSE-III Optical Limits
  7. GRB 100508A: Swift detection of a burst
  8. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  9. GRB 100503A: Fermi GBM detection
  10. GRB 100504A: Swift detection of a burst
  11. Trigger 421072: Possible Swift detection of a GRB or transient
  12. GRB 100423A: CrAO optical observations
  13. GRB 100425A: Swift detection of a burst
  14. GRB 100424A: Swift detection of a burst
  15. GRB 100420A: GRT Optical Observation
  16. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  17. GRB 100414A: IPN Localization
  18. GRB 100414A: Fermi GBM detection
  19. GRB 100413A: Swift detection of a burst
  20. GRB100401A: GROND Upper Limits
  21. GRB 100331B: GROND Upper limits
  22. GRB 100316A: R-band limit
  23. Swift detection of LS V +44 17
  24. INTEGRAL trigger 5994 / GRB 100331A: GROND detection of a variable source
  25. Fermi GBM detection of four Solar Flares
  26. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  27. GRB 100316D: Swift detection of a burst
  28. GRB 100305A: P60 Observations
  29. GRB 100305A: Swift detection of a burst
  30. GRB 100302A: Swift detection of a burst
  31. GRB 100206A: optical observations in CrAO
  32. GRB 100206A: optical observations in Terskol
  33. GRB 100213B: Swift detection of a burst
  34. GRB 100212A: Swift detection of a burst
  35. GRB 100205A: Keck limits on an underlying host galaxy
  36. GRB 100206A: WHT candidate afterglow
  37. GRB 100206A: Enhanced Swift-XRT position
  38. GRB 100206A: Pre-explosion imaging and host candidate
  39. GRB 100206A: Swift detection of a short hard burst
  40. GRB 100113A: Fermi GBM detection
  41. GRB 100205A Gemini-North IR afterglow candidate
  42. GRB 100205A: Gemini-South Observations
  43. GRB 100205A: NOT optical observations
  44. Short X-ray Transient detected by MAXI/GSC
  45. GRB 100119A: Swift detection of a burst
  46. GRB 100117A: Swift detection of a short hard burst
  47. GRB 091221: Swift detection of a burst
  48. GRB 091208A: GAO 150cm telescope Optical Observation
  49. GRB 091208B: GAO 150cm telescope Optical Observation
  50. GRB 091208B: GROND observations
  51. GRB 091208B: Fermi GBM observation
  52. GRB 091208A, RIMOTS optical upper limits
  53. GRB 091208B: MITSuME Akeno Optical Observation
  54. GRB 091208B: MITSuME Okayama Optical Observation
  55. GRB 091208B, RIMOTS optical upper limits
  56. GRB 091208B: Swift detection of a burst with an optical afterglow
  57. GRB 091208B: BOOTES-3 optical afterglow
  58. GRB 091208: ROTSE-III Optical Limits
  59. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  60. GRB 091202 - UVOT-enhanced XRT position
  61. GRB 091126B: Fermi GBM detection
  62. GRB 091130B: Swift detection of a burst
  63. GRB 091127: NOT observations
  64. GRB 091109B: Suzaku WAM observation of the prompt emission
  65. GRB 091109: Faulkes Telescope South observations
  66. GRB 091109: Enhanced Swift-XRT position
  67. GRB091109: REM detection of the NIR afterglow
  68. GRB 091109: Swift detection of a burst with optical afterglow
  69. GRB 091104: Swift detection of a burst
  70. GRB 091029: Swift detection of a burst with an optical counterpart
  71. A mistake in testing a new function in Swift
  72. GRB 091026: Swift detection of a Gamma Ray Burst
  73. GRB 091024: Fermi GBM Observations
  74. GRB 091024: Swift-XRT team refined analysis
  75. GRB 091024: GRAS004 optical observations
  76. GRB 091020: Swift detection of a burst with an optical afterglow
  77. GRB 091018: miniTAO/ANIR Observations
  78. GRB 091010: optical obsevation
  79. GRB 091010: optical afterglow candidate rejection
  80. GRB 091010: RXTE detection
  81. GRB 090910: SuperAGILE Localization of a Long GRB
  82. GRB 090929B: Suzaku WAM observation of the prompt emission
  83. Konus-Wind observation of GRB 090929B
  84. GRB 090929B: Swift detection of a burst
  85. GRB 090926B: Swift detection of a burst
  86. GRB 090925: Fermi GBM detection
  87. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  88. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  89. GRB 090904A: ROTSE-III Optical Limits
  90. GRB 090904: Swift detection of a burst
  91. GRB 090902B: GROND NIR Afterglow Observations
  92. GRB 090902: Fermi GBM detection
  93. GRB 090831B: MITSuME optical upper limits
  94. GRB 090831: MAXI GSC detection
  95. GRB 090831: Fermi GBM detection
  96. GRB 090826: Fermi GBM detection
  97. GRB 090817: No host galaxy, no supernova
  98. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  99. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  100. GRB 090814A, RIMOTS optical upper limits

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