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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"

32711 results found.

  1. Swift-BAT trigger 278809 is not a GRB
  2. GRB 070506: VLT redshift
  3. GRB070506: Swift/UVOT Observations
  4. GRB070506: Swift XRT refined analysis
  5. GRB 070506, Swift-BAT Refined Analysis
  6. GRB 070412, deep LBT imaging
  7. GRB 070429A: Swift XRT further analysis
  8. GRB070429B: VLT observations
  9. GRB 070429A: optical observations
  10. GRB070429B: position correction
  11. GRB 070309: Swift-XRT afterglow confirmation
  12. GRB070429B: possible host galaxy detection
  13. VLA observation of GRB 070429B
  14. Swift/UVOT observations of GRB070429B
  15. GRB 070429B, Swift-BAT refined analysis
  16. Swift/UVOT observations of GRB070429A
  17. GRB 070429A: Swift XRT refined analysis
  18. GRB 070429A, Swift-BAT refined analysis
  19. GRB 070429B: Swift XRT refined analysis
  20. GRB 070429B: ROTSE-III Optical Limits
  21. GRB 070429: ROTSE-III Optical Limits
  22. GRB 070427, Swift-BAT Refined Analysis
  23. LT monitoring of GRB070412
  24. GRB 070411, further deep LBT photometry
  25. GRB 070411: Late-time Keck imaging
  26. GRB070419B: Suzaku WAM observation of the prompt emission
  27. GRB 070420, SMARTS optical/IR afterglow observations
  28. GRB 070411, deep LBT photometry
  29. Konus-Wind observation of GRB 070420
  30. GRB 070411: break in the optical light curve
  31. GRB 070420 Swift-BAT Refined Analysis
  32. GRB070419A: Kuiper Optical detection
  33. GRB070419a: Swift UVOT observations
  34. GRB 070419A: MARGE Observations
  35. GRB 070420: optical rebrightening observed at Mt. John
  36. GRB 070420: Swift XRT refined analysis
  37. GRB070420: Swift UVOT continuing observations
  38. GRB 070411: BART early limit
  39. GRB 070420: Faulkes Telescope South Observations
  40. GBR 070419A: Swift/XRT refined analysis
  41. GRB 070420: NIR and optical afterglow confirmed
  42. GRB 070419A: MITSuME Okayama Observations
  43. GRB 070419A: Early Super-LOTIS Observations
  44. GRB 070419B, Swift-BAT refined analysis
  45. GRB 070419A Swift-BAT Refined Analysis
  46. GRB070419B: Confirmation of Optical Transient
  47. GRB 070419A: RAPTOR Detection of Early Emission
  48. GRB 070419B: Swift XRT refined analysis
  49. GRB 070419: Keck/LRIS Absorption Redshift
  50. GRB 070419A, Optical observations
  51. GRB 070411: Deep VLT detection
  52. GRB 070419A: SARA observations
  53. GRB 070419A: NAYUTA Optical Observation
  54. GRB 070419A: Faulkes Telescope North Optical Observations
  55. GRB 070419B optical afterglow candidate
  56. GRB 070419A: Optical and IR observations with KANATA
  57. GRB 070419B: optical afterglow candidate
  58. GRB070419A, optical observation
  59. Infrared detection of GRB070419A with UKIRT
  60. GRB070330: Correction to UVOT position
  61. GRB 070419: P60 Confirmation of Optical Afterglow
  62. GRB 070419 optical afterglow candidate
  63. GRB 070419A: ROTSE-III Optical Limits
  64. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  65. GRB 070418: Optical and IR observations with KANATA
  66. GRB 070406: Swift XRT refined analysis
  67. GRB 070318, SMARTS optical/IR afterglow observations
  68. GRB 070411: TLS data shows plateau, flares
  69. GRB070412: Swift UVOT observations
  70. GRB 070411: Swift/UVOT observations
  71. GRB 070412, Swift-BAT refined analysis
  72. GRB 070412 Liverpool Telescope optical limit
  73. GRB 070411: Optical photometry at Crni Vrh
  74. GRB 070412: Swift-XRT refined analysis
  75. GRB 070411: Swift-XRT refined analysis
  76. GRB 070412: further reanalysis of NOT images
  77. GRB 070412: Optical observations at Crni Vrh
  78. GRB 070411: OA redshift
  79. GRB 070412: Swift-XRT refined position
  80. GRB 070412: further NOT observations
  81. GRB 070412: Gemini/GMOS afterglow candidate
  82. GRB 070412: IAC80 optical afterglow candidate
  83. GRB 070412: NOT observations
  84. GRB 070412: Nearby bright galaxy
  85. GRB 070411, Swift-BAT refined analysis
  86. GRB 070411 : Liverpool Telescope Observations
  87. GRB 070411: Optical observations at Crni Vrh
  88. GRB 070411: ROTSE-III Detection of Optical Counterpart
  89. GRB 070411: Tautenburg RRM Afterglow Confirmation
  90. GRB 070406: "Star" in XRT error circle S2 is an AGN?
  91. GRB 070406: Swift XRT team further analysis
  92. Suzaku ToO observation of SGR 1806-20
  93. GRB 070406: Astrometrically Refined XRT Position, Unfading Source
  94. GRB 070406, Swift-BAT refined analysis
  95. GRB 070406: Gemini South Imaging and XRT analysis
  96. GRB070406: Swift UVOT observations
  97. GRB 070406: further analysis of NOT images.
  98. Short GRB 070406 - Possible Bright Host Galaxy
  99. GRB 070406: Swift XRT Team analysis - Possible X-ray counterpart
  100. GRB 070406: NOT observations

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