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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"

32508 results found.

  1. GRB 080420?: Swift detection of a possible short burst
  2. GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
  3. GRB 080413B: Rapid PROMPT Observations
  4. Swift XRT and UVOT observations of GRB080414
  5. GRB 080319B: Jet Break, Energetics, Supernova
  6. GRB 080413B: Faulkes Telescope South optical afterglow observations
  7. GRB 080413A: Liverpool Telescope and Faulkes Telescope South optical observations
  8. GRB 080413A: Suzaku WAM observation of the prompt emission
  9. GRB 080413B: Suzaku WAM observation of the prompt emission
  10. GRB 080413A: MOA-II optical afterglow observations
  11. GRB 080319B: Continued Gemini-N monitoring
  12. GRB 080414: RTT150 optical observations
  13. GRB 080414 Watcher observations
  14. VLA radio observations of GRB 080413B
  15. GRB 080413A: Gemini-South Spectroscopy
  16. GRB 080413B: Gemini-South Spectroscopy
  17. VLA radio observations of GRB 080413A
  18. GRB 080413B: Ep,i-Eiso correlation
  19. GRB080413B
  20. Swift-BAT spectral lag analysis of GRB 080413B
  21. GRB 080413a, SMARTS optical/IR afterglow observations
  22. GRB 080413B: Swift XRT refined analysis
  23. GRB080413A: Swift/UVOT observations
  24. GRB 080413B, Swift-BAT refined analysis
  25. GRB 080413A: Swift-XRT refined analysis
  26. GRB 080413A, Swift-BAT refined analysis
  27. GRB 080413A Bootes observation
  28. GRB 080413A: VLT/UVES redshift
  29. GRB 080413B: VLT redshift
  30. GRB080413B: REM NIR & Optical Observation
  31. GRB 080413B: GROND detection of afterglow in all bands
  32. GRB 080413A: REM detection of the NIR Afterglow
  33. GRB 080413: ROTSE-III Detection of Optical Counterpart
  34. GRB 080411: Swift/UVOT refined analysis
  35. GRB 080411, Swift-BAT refined analysis
  36. GRB 080411: Swift-XRT Refined Analysis
  37. Konus-Wind observation of GRB 080411
  38. GRB 080411: VLT redshift
  39. GRB 080411: GROND detection of optical afterglow candidate
  40. GRB080330: MAGIC telescope GeV observation
  41. GRB 080330: Swift-XRT refined position retraction
  42. GRB 080409: Swift-BAT refined analysis
  43. GRB 080408: GROND detection of optical/NIR afterglow candidate
  44. GRB 080330 optical observations
  45. Swift/UVOT observations of GRB080409
  46. GRB 080409: Swift XRT refined analysis
  47. UVOT/Swift Observations of GRB080408
  48. GRB 080408: Swift-XRT position of a possible afterglow
  49. GRB 080409: REM optical/NIR observations
  50. GRB 080408: Analysis of AGILE Gamma-ray data
  51. GRB 080319A: Early RAPTOR optical limits
  52. GRB 080319B: HST observations
  53. GRB 080330: RAPTOR detection of prompt optical flash
  54. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  55. GRB 080405: Swift-BAT refined analysis
  56. GRB 080405: Swift-XRT position
  57. GRB 080325: optical upper limit
  58. GRB 080328: GAO 150cm telescope Optical Observation
  59. GRB080330: Improved Swift XRT Position
  60. GRB 080330: Prompt PROMPT Observations
  61. GRB080330: optical observations
  62. GRB 080319B: TORTORA light curve (Correction)
  63. GRB080328, RIMOTS optical upper limit
  64. GRB080330: optical observations
  65. GRB080330: Swift XRT refined analysis
  66. GRB 080330: REM optical observations
  67. GRB 080330, SMARTS optical/IR afterglow observations
  68. GRB 080330 Swift-UVOT refined analysis
  69. GRB 080328: Suzaku WAM observation of the prompt emission
  70. GRB080330: TNT optical observations
  71. GRB 080330, Swift-BAT refined analysis
  72. Konus-Wind observation of GRB 080328
  73. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  74. GRB080330: LOAO R-band Detection
  75. GRB 080330: GROND Observations
  76. GRB 080330: NOT redshift
  77. GRB 080330A: PAIRITEL Infrared Detections
  78. GRB 080330: error in reported XRT position
  79. GRB 080330: Liverpool Telescope Optical observations
  80. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  81. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  82. GRB 080328: BTA optical imaging and spectroscopy
  83. GRB 080328, Swift-BAT refined analysis
  84. GRB 080328: Swift XRT refined analysis
  85. GRB 080325, Swift-BAT refined analysis
  86. Swift/UVOT observations of GRB080328
  87. GRB080325 - I and z-band Imaging
  88. GRB080328: Faulkes Telescope North observations
  89. GRB 080325: Subaru detection of NIR afterglow candidate
  90. GRB080310, late-time photometry with LBT
  91. GRB 080325: MITSuME Akeno optical upper limits
  92. GRB080325: XRT Refined Analysis
  93. GRB 080325: GROND Observations
  94. GRB080319B: optical observations
  95. GRB 080325: Swift/UVOT Upper Limits
  96. GRB 080319C: Gemini-North spectroscopic redshift
  97. GRB 080325: Early observations from OSN
  98. GRB 080325: NIR afterglow candidate
  99. GRB 080319D: GROND Detection of the Optical Counterpart
  100. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?

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