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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"

38683 results found.

  1. GRB 070411: Late-time Keck imaging
  2. GRB 070411 : Planned XMM-Newton observation
  3. GRB 070420, SMARTS optical/IR afterglow observations
  4. GRB 070411, deep LBT photometry
  5. Konus-Wind observation of GRB 070420
  6. GRB 070420 Swift-BAT Refined Analysis
  7. GRB070419A: Kuiper Optical detection
  8. GRB070419a: Swift UVOT observations
  9. GRB 070419A: MARGE Observations
  10. GRB 070420: optical rebrightening observed at Mt. John
  11. GRB 070420: Swift XRT refined analysis
  12. GRB070420: Swift UVOT continuing observations
  13. GRB 070420: Faulkes Telescope South Observations
  14. GBR 070419A: Swift/XRT refined analysis
  15. GRB 070420: NIR and optical afterglow confirmed
  16. GRB 070420: Swift detection of a burst with optical afterglow
  17. GRB 070419A: MITSuME Okayama Observations
  18. GRB 070419A: Early Super-LOTIS Observations
  19. GRB 070419B, Swift-BAT refined analysis
  20. GRB 070419A Swift-BAT Refined Analysis
  21. GRB070419B: Confirmation of Optical Transient
  22. GRB 070419A: RAPTOR Detection of Early Emission
  23. GRB 070419B: Swift XRT refined analysis
  24. GRB 070419: Keck/LRIS Absorption Redshift
  25. GRB 070419B: optical afterglow confirmation
  26. GRB 070419A, Optical observations
  27. GRB 070411: Deep VLT detection
  28. GRB070419 - SDSS Pre-Burst Observations
  29. GRB 070419A: SARA observations
  30. GRB 070419A: NAYUTA Optical Observation
  31. GRB 070419A: Faulkes Telescope North Optical Observations
  32. GRB 070419B optical afterglow candidate
  33. GRB 070419A: Optical and IR observations with KANATA
  34. GRB 070419B: optical afterglow candidate
  35. GRB 070419A: Lulin Optical observation
  36. GRB070419A, optical observation
  37. GRB 070419A: Kiso Optical observation
  38. GRB070330: Correction to UVOT position
  39. GRB 070419: P60 Confirmation of Optical Afterglow
  40. GRB 070419B: Swift detection of a burst
  41. GRB 070419A: ROTSE-III Optical Limits
  42. GRB 070419: Swift detection of a burst
  43. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  44. GRB 070418: Optical and IR observations with KANATA
  45. Trigger 276045: Swift detection of a possible burst
  46. GRB 070406: Swift XRT refined analysis
  47. IBAS Alert n.4202: not a real GRB
  48. GRB 070318, SMARTS optical/IR afterglow observations
  49. GRB 070411: TLS data shows plateau, flares
  50. GRB070412: Swift UVOT observations
  51. IBAS Alert n.4199: Not a GRB
  52. GRB 070411: Swift/UVOT observations
  53. GRB 070412, Swift-BAT refined analysis
  54. GRB 070411: Optical photometry at Crni Vrh
  55. GRB 070412: Swift-XRT refined analysis
  56. GRB 070411: Swift-XRT refined analysis
  57. GRB 070412: Optical observations at Crni Vrh
  58. GRB 070411: OA redshift
  59. GRB 070412: Swift-XRT refined position
  60. GRB 070412: further NOT observations
  61. GRB 070412: Gemini/GMOS afterglow candidate
  62. GRB 070412: IAC80 optical afterglow candidate
  63. GRB 070411: Magellan/Clay photometry
  64. GRB 070411: Magellan/IMACS photometry
  65. GRB 070412: Nearby bright galaxy
  66. GRB 070411, Swift-BAT refined analysis
  67. GRB 070412: Swift detection of a burst
  68. GRB 070411: Optical observations at Crni Vrh
  69. GRB 070411: ROTSE-III Detection of Optical Counterpart
  70. GRB 070411: Swift detection of a burst with optical afterglow
  71. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  72. GRB 070406: Swift XRT team further analysis
  73. Suzaku ToO observation of SGR 1806-20
  74. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  75. GRB 070406: Bright galaxy in XRT error circle is a quasar
  76. GRB 070406, Swift-BAT refined analysis
  77. GRB 070406: Correction to the optical candidate in GCN6253
  78. GRB 070406: Gemini South Imaging and XRT analysis
  79. GRB070406: Swift UVOT observations
  80. GRB 070406: further analysis of NOT images.
  81. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  82. GRB 070406: NOT observations
  83. GRB 070406: Optical candidate
  84. GRB 070406: The exprosure time of Xinglong TNT optical Upper Limit
  85. GRB 070406: SARA upper limit
  86. GRB 070406: Xinglong TNT optical Upper Limit
  87. GRB 070406: photo-z of a bright galaxy in BAT error circle
  88. GRB 070406: Swift detection of a burst
  89. GRB 070402: Suzaku WAM observation of the prompt emission
  90. GRB 070311, deep optical photometry
  91. Konus-Wind and Konus-A observations of GRB 070402
  92. IPN triangulation of GRB070402
  93. GRB 070328: Suzaku WAM observation of the prompt emission
  94. INTEGRAL ToO Observation of SGR1806-20
  95. UVOT observations of GRB070330
  96. GRB 070330, Swift-BAT refined analysis
  97. GRB 070330, SMARTS optical/IR observations
  98. GRB 070330: Swift-XRT refined analysis
  99. GRB 070330 - Watcher Observations
  100. GRB 070330: Swift detection of a burst

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