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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"

31728 results found.

  1. GRB080430: RTT150 Optical Observations
  2. GRB080430: Swift/UVOT observations
  3. VLA radio upper limit on GRB 080430
  4. GRB 080430 - multicolor observations of the afterglow
  5. GRB 080430 optical observations
  6. GRB 080430, Swift-BAT refined analysis
  7. GRB080430: optical observations
  8. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  9. GRB 080430: Swift-XRT refined analysis
  10. GRB080430: Optical observation in AsU CAS Ondrejov & Brno
  11. GRB080426: Observations from CAHA
  12. GRB 080426: Swift-XRT refined analysis
  13. GRB080426: Swift/UVOT upper limits
  14. GRB 080426, Swift-BAT refined analysis
  15. Possible GRB 080315: XRT non-detection of afterglow
  16. GRB 080320 : Faulkes Telescope North Observations
  17. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  18. GRB080319A: MAGIC telescope GeV observation
  19. Swift-BAT trigger 309665 is not a GRB
  20. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  21. GRB 080420?: Swift detection of a possible short burst
  22. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  23. GRB 080413B: Rapid PROMPT Observations
  24. Swift XRT and UVOT observations of GRB080414
  25. GRB 080319B: Jet Break, Energetics, Supernova
  26. GRB 080413B: Faulkes Telescope South optical afterglow observations
  27. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  28. GRB 080413A: Suzaku WAM observation of the prompt emission
  29. GRB 080413B: Suzaku WAM observation of the prompt emission
  30. GRB 080413A: MOA-II optical afterglow observations
  31. GRB 080319B: Continued Gemini-N monitoring
  32. GRB 080414: RTT150 optical observations
  33. GRB 080414 Watcher observations
  34. VLA radio observations of GRB 080413B
  35. GRB 080413A: Gemini-South Spectroscopy
  36. GRB 080413B: Gemini-South Spectroscopy
  37. VLA radio observations of GRB 080413A
  38. GRB 080413B: Ep,i-Eiso correlation
  39. GRB080413B
  40. Swift-BAT spectral lag analysis of GRB 080413B
  41. GRB 080413a, SMARTS optical/IR afterglow observations
  42. GRB 080413B: Swift XRT refined analysis
  43. GRB080413A: Swift/UVOT observations
  44. GRB 080413B, Swift-BAT refined analysis
  45. GRB 080413A: Swift-XRT refined analysis
  46. GRB 080413A, Swift-BAT refined analysis
  47. GRB 080413A Bootes observation
  48. GRB 080413A: VLT/UVES redshift
  49. GRB 080413B: VLT redshift
  50. GRB080413B: REM NIR & Optical Observation
  51. GRB 080413B: GROND detection of afterglow in all bands
  52. GRB 080413A: REM detection of the NIR Afterglow
  53. GRB 080413: ROTSE-III Detection of Optical Counterpart
  54. GRB 080411: Swift/UVOT refined analysis
  55. GRB 080411, Swift-BAT refined analysis
  56. GRB 080411: Swift-XRT Refined Analysis
  57. Konus-Wind observation of GRB 080411
  58. GRB 080411: VLT redshift
  59. GRB 080411: GROND detection of optical afterglow candidate
  60. GRB080330: MAGIC telescope GeV observation
  61. GRB 080330: Swift-XRT refined position retraction
  62. GRB 080409: Swift-BAT refined analysis
  63. GRB 080408: GROND detection of optical/NIR afterglow candidate
  64. GRB 080330 optical observations
  65. Swift/UVOT observations of GRB080409
  66. GRB 080409: Swift XRT refined analysis
  67. UVOT/Swift Observations of GRB080408
  68. GRB 080408: Swift-XRT position of a possible afterglow
  69. GRB 080409: REM optical/NIR observations
  70. GRB 080408: Analysis of AGILE Gamma-ray data
  71. GRB 080319A: Early RAPTOR optical limits
  72. GRB 080319B: HST observations
  73. GRB 080330: RAPTOR detection of prompt optical flash
  74. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  75. GRB 080405: Swift-BAT refined analysis
  76. GRB 080405: Swift-XRT position
  77. GRB 080325: optical upper limit
  78. GRB 080328: GAO 150cm telescope Optical Observation
  79. GRB080330: Improved Swift XRT Position
  80. GRB 080330: Prompt PROMPT Observations
  81. GRB080330: optical observations
  82. GRB 080319B: TORTORA light curve (Correction)
  83. GRB080328, RIMOTS optical upper limit
  84. GRB080330: optical observations
  85. GRB080330: Swift XRT refined analysis
  86. GRB 080330: REM optical observations
  87. GRB 080330, SMARTS optical/IR afterglow observations
  88. GRB 080330 Swift-UVOT refined analysis
  89. GRB 080328: Suzaku WAM observation of the prompt emission
  90. GRB080330: TNT optical observations
  91. GRB 080330, Swift-BAT refined analysis
  92. Konus-Wind observation of GRB 080328
  93. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  94. GRB080330: LOAO R-band Detection
  95. GRB 080330: GROND Observations
  96. GRB 080330: NOT redshift
  97. GRB 080330A: PAIRITEL Infrared Detections
  98. GRB 080330: error in reported XRT position
  99. GRB 080330: Liverpool Telescope Optical observations
  100. GRB 080330A: ROTSE-III Detection of Optical Counterpart

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