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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"

32544 results found.

  1. GRB 070520A: Swift-XRT refined analysis
  2. GRB 070518: TNG observations
  3. GRB 070520: Xinglong EST optical Upper Limit
  4. VLA observation of GRB 070518
  5. GRB 070518: Swift-XRT refined analysis
  6. GRB 070517: Gemini optical imaging
  7. GRB070518: UVOT refined analysis
  8. GRB 070518, Swift-BAT refined analysis
  9. GRB 070518: OT confirmed form Xinglong TNT observation
  10. GRB070517: Swift-XRT Refined Analysis
  11. GRB 070517, Swift-BAT refined analysis
  12. GRB 070509: objects inside XRT error circle
  13. GRB070419A: optical observations
  14. GRB 070419A, Deep LBT photometry
  15. GRB 070509: Swift/UVOT Upper Limits
  16. Konus-Wind and Konus-A observation of GRB 070508
  17. Swift-BAT trigger 278987 is not a GRB
  18. GRB070509: Swift-XRT Refined Analysis
  19. RHESSI Spectrum of GRB070508
  20. GRB 070508: OA fading and tentative redshift
  21. GRB 070509, Swift-BAT refined analysis
  22. GRB 070508: Suzaku/WAM observation of the prompt emission
  23. GRB 070509: REM observations
  24. GRB 070509: ROTSE-III Optical Limits
  25. GRB070508: Swift/UVOT Observations
  26. GRB 070508, SMARTS optical afterglow observation
  27. GRB 070508, Swift-BAT refined analysis
  28. GRB 070508: Multicolor optical observations and possible redshift limit
  29. GRB 070508: Swift-XRT refined analysis
  30. GRB 070508: Optical observation limiting magnitude
  31. GRB 070508: Optical afterglow detection
  32. GRB 070508: REM observations
  33. GRB070412: MAGIC telescope GeV observation
  34. Swift-BAT trigger 278809 is not a GRB
  35. GRB 070506: VLT redshift
  36. GRB070506: Swift/UVOT Observations
  37. GRB070506: Swift XRT refined analysis
  38. GRB 070506, Swift-BAT Refined Analysis
  39. GRB 070412, deep LBT imaging
  40. GRB 070429A: Swift XRT further analysis
  41. GRB070429B: VLT observations
  42. GRB 070429A: optical observations
  43. GRB070429B: position correction
  44. GRB 070309: Swift-XRT afterglow confirmation
  45. GRB070429B: possible host galaxy detection
  46. VLA observation of GRB 070429B
  47. Swift/UVOT observations of GRB070429B
  48. GRB 070429B, Swift-BAT refined analysis
  49. Swift/UVOT observations of GRB070429A
  50. GRB 070429A: Swift XRT refined analysis
  51. GRB 070429A, Swift-BAT refined analysis
  52. GRB 070429B: Swift XRT refined analysis
  53. GRB 070429B: ROTSE-III Optical Limits
  54. GRB 070429: ROTSE-III Optical Limits
  55. GRB 070427, Swift-BAT Refined Analysis
  56. LT monitoring of GRB070412
  57. GRB 070411, further deep LBT photometry
  58. GRB 070411: Late-time Keck imaging
  59. GRB070419B: Suzaku WAM observation of the prompt emission
  60. GRB 070420, SMARTS optical/IR afterglow observations
  61. GRB 070411, deep LBT photometry
  62. Konus-Wind observation of GRB 070420
  63. GRB 070411: break in the optical light curve
  64. GRB 070420 Swift-BAT Refined Analysis
  65. GRB070419A: Kuiper Optical detection
  66. GRB070419a: Swift UVOT observations
  67. GRB 070419A: MARGE Observations
  68. GRB 070420: optical rebrightening observed at Mt. John
  69. GRB 070420: Swift XRT refined analysis
  70. GRB070420: Swift UVOT continuing observations
  71. GRB 070411: BART early limit
  72. GRB 070420: Faulkes Telescope South Observations
  73. GBR 070419A: Swift/XRT refined analysis
  74. GRB 070420: NIR and optical afterglow confirmed
  75. GRB 070419A: MITSuME Okayama Observations
  76. GRB 070419A: Early Super-LOTIS Observations
  77. GRB 070419B, Swift-BAT refined analysis
  78. GRB 070419A Swift-BAT Refined Analysis
  79. GRB070419B: Confirmation of Optical Transient
  80. GRB 070419A: RAPTOR Detection of Early Emission
  81. GRB 070419B: Swift XRT refined analysis
  82. GRB 070419: Keck/LRIS Absorption Redshift
  83. GRB 070419A, Optical observations
  84. GRB 070411: Deep VLT detection
  85. GRB 070419A: SARA observations
  86. GRB 070419A: NAYUTA Optical Observation
  87. GRB 070419A: Faulkes Telescope North Optical Observations
  88. GRB 070419B optical afterglow candidate
  89. GRB 070419A: Optical and IR observations with KANATA
  90. GRB 070419B: optical afterglow candidate
  91. GRB070419A, optical observation
  92. Infrared detection of GRB070419A with UKIRT
  93. GRB070330: Correction to UVOT position
  94. GRB 070419: P60 Confirmation of Optical Afterglow
  95. GRB 070419 optical afterglow candidate
  96. GRB 070419A: ROTSE-III Optical Limits
  97. Swift-BAT Trigger 276045 is a Cosmic Ray Shower event
  98. GRB 070418: Optical and IR observations with KANATA
  99. GRB 070406: Swift XRT refined analysis
  100. GRB 070318, SMARTS optical/IR afterglow observations

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