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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

31731 results found.

  1. GRB 070419A, Deep LBT photometry
  2. GRB 070509: Swift/UVOT Upper Limits
  3. Konus-Wind and Konus-A observation of GRB 070508
  4. Swift-BAT trigger 278987 is not a GRB
  5. GRB070509: Swift-XRT Refined Analysis
  6. RHESSI Spectrum of GRB070508
  7. GRB 070508: OA fading and tentative redshift
  8. GRB 070509, Swift-BAT refined analysis
  9. GRB 070508: Suzaku/WAM observation of the prompt emission
  10. GRB 070509: REM observations
  11. GRB 070509: ROTSE-III Optical Limits
  12. GRB070508: Swift/UVOT Observations
  13. GRB 070508, SMARTS optical afterglow observation
  14. GRB 070508, Swift-BAT refined analysis
  15. GRB 070508: Multicolor optical observations and possible redshift limit
  16. GRB 070508: Swift-XRT refined analysis
  17. GRB 070508: Optical observation limiting magnitude
  18. GRB 070508: Optical afterglow detection
  19. GRB 070508: REM observations
  20. GRB070412: MAGIC telescope GeV observation
  21. Swift-BAT trigger 278809 is not a GRB
  22. GRB 070506: VLT redshift
  23. GRB070506: Swift/UVOT Observations
  24. GRB070506: Swift XRT refined analysis
  25. GRB 070506, Swift-BAT Refined Analysis
  26. GRB 070412, deep LBT imaging
  27. GRB 070429A: Swift XRT further analysis
  28. GRB070429B: VLT observations
  29. GRB 070429A: optical observations
  30. GRB070429B: position correction
  31. GRB 070309: Swift-XRT afterglow confirmation
  32. GRB070429B: possible host galaxy detection
  33. VLA observation of GRB 070429B
  34. Swift/UVOT observations of GRB070429B
  35. GRB 070429B, Swift-BAT refined analysis
  36. Swift/UVOT observations of GRB070429A
  37. GRB 070429A: Swift XRT refined analysis
  38. GRB 070429A, Swift-BAT refined analysis
  39. GRB 070429B: Swift XRT refined analysis
  40. GRB 070429B: ROTSE-III Optical Limits
  41. GRB 070429: ROTSE-III Optical Limits
  42. GRB 070427, Swift-BAT Refined Analysis
  43. LT monitoring of GRB070412
  44. GRB 070411, further deep LBT photometry
  45. GRB 070411: Late-time Keck imaging
  46. GRB070419B: Suzaku WAM observation of the prompt emission
  47. GRB 070420, SMARTS optical/IR afterglow observations
  48. GRB 070411, deep LBT photometry
  49. Konus-Wind observation of GRB 070420
  50. GRB 070411: break in the optical light curve
  51. GRB 070420 Swift-BAT Refined Analysis
  52. GRB070419A: Kuiper Optical detection
  53. GRB070419a: Swift UVOT observations
  54. GRB 070419A: MARGE Observations
  55. GRB 070420: optical rebrightening observed at Mt. John
  56. GRB 070420: Swift XRT refined analysis
  57. GRB070420: Swift UVOT continuing observations
  58. GRB 070411: BART early limit
  59. GRB 070420: Faulkes Telescope South Observations
  60. GBR 070419A: Swift/XRT refined analysis
  61. GRB 070420: NIR and optical afterglow confirmed
  62. GRB 070419A: MITSuME Okayama Observations
  63. GRB 070419A: Early Super-LOTIS Observations
  64. GRB 070419B, Swift-BAT refined analysis
  65. GRB 070419A Swift-BAT Refined Analysis
  66. GRB070419B: Confirmation of Optical Transient
  67. GRB 070419A: RAPTOR Detection of Early Emission
  68. GRB 070419B: Swift XRT refined analysis
  69. GRB 070419: Keck/LRIS Absorption Redshift
  70. GRB 070419A, Optical observations
  71. GRB 070411: Deep VLT detection
  72. GRB 070419A: SARA observations
  73. GRB 070419A: NAYUTA Optical Observation
  74. GRB 070419A: Faulkes Telescope North Optical Observations
  75. GRB 070419B optical afterglow candidate
  76. GRB 070419A: Optical and IR observations with KANATA
  77. GRB 070419B: optical afterglow candidate
  78. GRB070419A, optical observation
  79. Infrared detection of GRB070419A with UKIRT
  80. GRB070330: Correction to UVOT position
  81. GRB 070419: P60 Confirmation of Optical Afterglow
  82. GRB 070419 optical afterglow candidate
  83. GRB 070419A: ROTSE-III Optical Limits
  84. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  85. GRB 070418: Optical and IR observations with KANATA
  86. GRB 070406: Swift XRT refined analysis
  87. GRB 070318, SMARTS optical/IR afterglow observations
  88. GRB 070411: TLS data shows plateau, flares
  89. GRB070412: Swift UVOT observations
  90. GRB 070411: Swift/UVOT observations
  91. GRB 070412, Swift-BAT refined analysis
  92. GRB 070412 Liverpool Telescope optical limit
  93. GRB 070411: Optical photometry at Crni Vrh
  94. GRB 070412: Swift-XRT refined analysis
  95. GRB 070411: Swift-XRT refined analysis
  96. GRB 070412: further reanalysis of NOT images
  97. GRB 070412: Optical observations at Crni Vrh
  98. GRB 070411: OA redshift
  99. GRB 070412: Swift-XRT refined position
  100. GRB 070412: further NOT observations

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