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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"

35344 results found.

  1. GRB080430: optical observations
  2. GRB 080430: Hobby-Eberly Telescope Absorption Redshift
  3. GRB 080430: Swift-XRT refined analysis
  4. GRB 080430: Enhanced Swift-XRT position
  5. GRB 080430: Spectroscopy from CAHA
  6. GRB 080430 - SDSS Pre-Burst Observations
  7. GRB 080430: Bootes observation
  8. GRB 080430: Swift detection of a burst with optical afterglow
  9. GRB 080430: TAROT Calern observatory optical observations
  10. GRB960202B - on the association with SN 1996cr
  11. GRB080426: Observations from CAHA
  12. GRB 080426: Swift-XRT refined analysis
  13. GRB080426: Swift/UVOT upper limits
  14. GRB 080426: Enhanced Swift-XRT position
  15. GRB 080426, Swift-BAT refined analysis
  16. GRB 080426: Swift detection of a possibly short burst
  17. Possible GRB 080315: XRT non-detection of afterglow
  18. GRB 080320 : Faulkes Telescope North Observations
  19. GRB 080319A : Liverpool and Faulkes Telescopes Observations
  20. Swift-BAT trigger 309665 is not a GRB
  21. GRB 080420A: ROTSE-III Optical Limits on a possible short burst
  22. GRB 080420?: Swift detection of a possible short burst
  23. GRB080310, BVRcIc field calibration
  24. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  25. GRB 080413B: Rapid PROMPT Observations
  26. Swift XRT and UVOT observations of GRB080414
  27. GRB 080319B: Jet Break, Energetics, Supernova
  28. GRB 080413B: Faulkes Telescope South optical afterglow observations
  29. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  30. GRB 080413A: Suzaku WAM observation of the prompt emission
  31. GRB 080413B: Suzaku WAM observation of the prompt emission
  32. GRB 080413A: MOA-II optical afterglow observations
  33. GRB 080319B: Continued Gemini-N monitoring
  34. GRB 080414: RTT150 optical observations
  35. GRB 080414 Watcher observations
  36. GRB 080414: A long GRB detected by INTEGRAL
  37. VLA radio observations of GRB 080413B
  38. GRB 080413A: Gemini-South Spectroscopy
  39. GRB 080413B: Gemini-South Spectroscopy
  40. VLA radio observations of GRB 080413A
  41. IBAS Alert n. 5257 : not a GRB
  42. GRB 080413B: Ep,i-Eiso correlation
  43. GRB080413B
  44. Swift-BAT spectral lag analysis of GRB 080413B
  45. GRB 080413a, SMARTS optical/IR afterglow observations
  46. GRB 080413B: Swift XRT refined analysis
  47. GRB080413A: Swift/UVOT observations
  48. GRB 080413B, Swift-BAT refined analysis
  49. GRB 080413A: Swift-XRT refined analysis
  50. GRB 080413A, Swift-BAT refined analysis
  51. GRB 080413A Bootes observation
  52. GRB 080413A: VLT/UVES redshift
  53. GRB 080413B: VLT redshift
  54. GRB080413B: REM NIR & Optical Observation
  55. GRB 080413B: GROND detection of afterglow in all bands
  56. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  57. GRB 080413A: REM detection of the NIR Afterglow
  58. GRB 080413: Enhanced Swift-XRT position
  59. GRB 080413: TAROT Calern observatory optical observations
  60. GRB 080413: Swift detection of a burst with an optical afterglow
  61. GRB 080413: ROTSE-III Detection of Optical Counterpart
  62. GRB 080411: Swift/UVOT refined analysis
  63. GRB 080411, Swift-BAT refined analysis
  64. GRB 080411: Swift-XRT Refined Analysis
  65. Konus-Wind observation of GRB 080411
  66. GRB 080411: Enhanced Swift-XRT position
  67. GRB 080411: VLT redshift
  68. GRB 080411: GROND detection of optical afterglow candidate
  69. GRB 080411: Swift detection of a bright burst
  70. GRB 080330: Swift-XRT refined position retraction
  71. GRB 080409: Swift-BAT refined analysis
  72. GRB 080408: GROND detection of optical/NIR afterglow candidate
  73. GRB 080330 optical observations
  74. Swift/UVOT observations of GRB080409
  75. GRB 080409: Swift XRT refined analysis
  76. UVOT/Swift Observations of GRB080408
  77. GRB 080408: Swift-XRT position of a possible afterglow
  78. GRB 080409: Enhanced Swift-XRT position
  79. GRB 080409: REM optical/NIR observations
  80. GRB 080409: Swift detection of a burst
  81. GRB 080408: Analysis of AGILE Gamma-ray data
  82. GRB 080408: GRB Localization by SuperAGILE
  83. GRB 080319A: Early RAPTOR optical limits
  84. GRB 080319B: HST observations
  85. GRB 080330: RAPTOR detection of prompt optical flash
  86. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  87. GRB 080405: Swift-BAT refined analysis
  88. GRB 080405: Swift-XRT position
  89. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  90. GRB 080325: optical upper limit
  91. GRB 080328: GAO 150cm telescope Optical Observation
  92. GRB080330: Improved Swift XRT Position
  93. GRB 080330: Prompt PROMPT Observations
  94. GRB080330: optical observations
  95. GRB 080319B: TORTORA light curve (Correction)
  96. GRB080330: optical observations
  97. GRB080330: Swift XRT refined analysis
  98. GRB 080330: REM optical observations
  99. GRB 080330, SMARTS optical/IR afterglow observations
  100. GRB 080330 Swift-UVOT refined analysis

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