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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"

32721 results found.

  1. GRB 070509: ROTSE-III Optical Limits
  2. GRB070508: Swift/UVOT Observations
  3. GRB 070508, SMARTS optical afterglow observation
  4. GRB 070508, Swift-BAT refined analysis
  5. GRB 070508: Multicolor optical observations and possible redshift limit
  6. GRB 070508: Swift-XRT refined analysis
  7. GRB 070508: Optical observation limiting magnitude
  8. GRB 070508: Optical afterglow detection
  9. GRB 070508: REM observations
  10. GRB070412: MAGIC telescope GeV observation
  11. Swift-BAT trigger 278809 is not a GRB
  12. GRB 070506: VLT redshift
  13. GRB070506: Swift/UVOT Observations
  14. GRB070506: Swift XRT refined analysis
  15. GRB 070506, Swift-BAT Refined Analysis
  16. GRB 070412, deep LBT imaging
  17. GRB 070429A: Swift XRT further analysis
  18. GRB070429B: VLT observations
  19. GRB 070429A: optical observations
  20. GRB070429B: position correction
  21. GRB 070309: Swift-XRT afterglow confirmation
  22. GRB070429B: possible host galaxy detection
  23. VLA observation of GRB 070429B
  24. Swift/UVOT observations of GRB070429B
  25. GRB 070429B, Swift-BAT refined analysis
  26. Swift/UVOT observations of GRB070429A
  27. GRB 070429A: Swift XRT refined analysis
  28. GRB 070429A, Swift-BAT refined analysis
  29. GRB 070429B: Swift XRT refined analysis
  30. GRB 070429B: ROTSE-III Optical Limits
  31. GRB 070429: ROTSE-III Optical Limits
  32. GRB 070427, Swift-BAT Refined Analysis
  33. LT monitoring of GRB070412
  34. GRB 070411, further deep LBT photometry
  35. GRB 070411: Late-time Keck imaging
  36. GRB070419B: Suzaku WAM observation of the prompt emission
  37. GRB 070420, SMARTS optical/IR afterglow observations
  38. GRB 070411, deep LBT photometry
  39. Konus-Wind observation of GRB 070420
  40. GRB 070411: break in the optical light curve
  41. GRB 070420 Swift-BAT Refined Analysis
  42. GRB070419A: Kuiper Optical detection
  43. GRB070419a: Swift UVOT observations
  44. GRB 070419A: MARGE Observations
  45. GRB 070420: optical rebrightening observed at Mt. John
  46. GRB 070420: Swift XRT refined analysis
  47. GRB070420: Swift UVOT continuing observations
  48. GRB 070411: BART early limit
  49. GRB 070420: Faulkes Telescope South Observations
  50. GBR 070419A: Swift/XRT refined analysis
  51. GRB 070420: NIR and optical afterglow confirmed
  52. GRB 070419A: MITSuME Okayama Observations
  53. GRB 070419A: Early Super-LOTIS Observations
  54. GRB 070419B, Swift-BAT refined analysis
  55. GRB 070419A Swift-BAT Refined Analysis
  56. GRB070419B: Confirmation of Optical Transient
  57. GRB 070419A: RAPTOR Detection of Early Emission
  58. GRB 070419B: Swift XRT refined analysis
  59. GRB 070419: Keck/LRIS Absorption Redshift
  60. GRB 070419A, Optical observations
  61. GRB 070411: Deep VLT detection
  62. GRB 070419A: SARA observations
  63. GRB 070419A: NAYUTA Optical Observation
  64. GRB 070419A: Faulkes Telescope North Optical Observations
  65. GRB 070419B optical afterglow candidate
  66. GRB 070419A: Optical and IR observations with KANATA
  67. GRB 070419B: optical afterglow candidate
  68. GRB070419A, optical observation
  69. Infrared detection of GRB070419A with UKIRT
  70. GRB070330: Correction to UVOT position
  71. GRB 070419: P60 Confirmation of Optical Afterglow
  72. GRB 070419 optical afterglow candidate
  73. GRB 070419A: ROTSE-III Optical Limits
  74. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  75. GRB 070418: Optical and IR observations with KANATA
  76. GRB 070406: Swift XRT refined analysis
  77. GRB 070318, SMARTS optical/IR afterglow observations
  78. GRB 070411: TLS data shows plateau, flares
  79. GRB070412: Swift UVOT observations
  80. GRB 070411: Swift/UVOT observations
  81. GRB 070412, Swift-BAT refined analysis
  82. GRB 070412 Liverpool Telescope optical limit
  83. GRB 070411: Optical photometry at Crni Vrh
  84. GRB 070412: Swift-XRT refined analysis
  85. GRB 070411: Swift-XRT refined analysis
  86. GRB 070412: further reanalysis of NOT images
  87. GRB 070412: Optical observations at Crni Vrh
  88. GRB 070411: OA redshift
  89. GRB 070412: Swift-XRT refined position
  90. GRB 070412: further NOT observations
  91. GRB 070412: Gemini/GMOS afterglow candidate
  92. GRB 070412: IAC80 optical afterglow candidate
  93. GRB 070412: NOT observations
  94. GRB 070412: Nearby bright galaxy
  95. GRB 070411, Swift-BAT refined analysis
  96. GRB 070411 : Liverpool Telescope Observations
  97. GRB 070411: Optical observations at Crni Vrh
  98. GRB 070411: ROTSE-III Detection of Optical Counterpart
  99. GRB 070411: Tautenburg RRM Afterglow Confirmation
  100. GRB 070406: "Star" in XRT error circle S2 is an AGN?

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