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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"

32491 results found.

  1. GRB 080413B: Ep,i-Eiso correlation
  2. GRB080413B
  3. Swift-BAT spectral lag analysis of GRB 080413B
  4. GRB 080413a, SMARTS optical/IR afterglow observations
  5. GRB 080413B: Swift XRT refined analysis
  6. GRB080413A: Swift/UVOT observations
  7. GRB 080413B, Swift-BAT refined analysis
  8. GRB 080413A: Swift-XRT refined analysis
  9. GRB 080413A, Swift-BAT refined analysis
  10. GRB 080413A Bootes observation
  11. GRB 080413A: VLT/UVES redshift
  12. GRB 080413B: VLT redshift
  13. GRB080413B: REM NIR & Optical Observation
  14. GRB 080413B: GROND detection of afterglow in all bands
  15. GRB 080413A: REM detection of the NIR Afterglow
  16. GRB 080413: ROTSE-III Detection of Optical Counterpart
  17. GRB 080411: Swift/UVOT refined analysis
  18. GRB 080411, Swift-BAT refined analysis
  19. GRB 080411: Swift-XRT Refined Analysis
  20. Konus-Wind observation of GRB 080411
  21. GRB 080411: VLT redshift
  22. GRB 080411: GROND detection of optical afterglow candidate
  23. GRB080330: MAGIC telescope GeV observation
  24. GRB 080330: Swift-XRT refined position retraction
  25. GRB 080409: Swift-BAT refined analysis
  26. GRB 080408: GROND detection of optical/NIR afterglow candidate
  27. GRB 080330 optical observations
  28. Swift/UVOT observations of GRB080409
  29. GRB 080409: Swift XRT refined analysis
  30. UVOT/Swift Observations of GRB080408
  31. GRB 080408: Swift-XRT position of a possible afterglow
  32. GRB 080409: REM optical/NIR observations
  33. GRB 080408: Analysis of AGILE Gamma-ray data
  34. GRB 080319A: Early RAPTOR optical limits
  35. GRB 080319B: HST observations
  36. GRB 080330: RAPTOR detection of prompt optical flash
  37. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  38. GRB 080405: Swift-BAT refined analysis
  39. GRB 080405: Swift-XRT position
  40. GRB 080325: optical upper limit
  41. GRB 080328: GAO 150cm telescope Optical Observation
  42. GRB080330: Improved Swift XRT Position
  43. GRB 080330: Prompt PROMPT Observations
  44. GRB080330: optical observations
  45. GRB 080319B: TORTORA light curve (Correction)
  46. GRB080328, RIMOTS optical upper limit
  47. GRB080330: optical observations
  48. GRB080330: Swift XRT refined analysis
  49. GRB 080330: REM optical observations
  50. GRB 080330, SMARTS optical/IR afterglow observations
  51. GRB 080330 Swift-UVOT refined analysis
  52. GRB 080328: Suzaku WAM observation of the prompt emission
  53. GRB080330: TNT optical observations
  54. GRB 080330, Swift-BAT refined analysis
  55. Konus-Wind observation of GRB 080328
  56. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  57. GRB080330: LOAO R-band Detection
  58. GRB 080330: GROND Observations
  59. GRB 080330: NOT redshift
  60. GRB 080330A: PAIRITEL Infrared Detections
  61. GRB 080330: error in reported XRT position
  62. GRB 080330: Liverpool Telescope Optical observations
  63. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  64. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  65. GRB 080328: BTA optical imaging and spectroscopy
  66. GRB 080328, Swift-BAT refined analysis
  67. GRB 080328: Swift XRT refined analysis
  68. GRB 080325, Swift-BAT refined analysis
  69. Swift/UVOT observations of GRB080328
  70. GRB080325 - I and z-band Imaging
  71. GRB080328: Faulkes Telescope North observations
  72. GRB 080325: Subaru detection of NIR afterglow candidate
  73. GRB080310, late-time photometry with LBT
  74. GRB 080325: MITSuME Akeno optical upper limits
  75. GRB080325: XRT Refined Analysis
  76. GRB 080325: GROND Observations
  77. GRB080319B: optical observations
  78. GRB 080325: Swift/UVOT Upper Limits
  79. GRB 080319C: Gemini-North spectroscopic redshift
  80. GRB 080325: Early observations from OSN
  81. GRB 080325: NIR afterglow candidate
  82. GRB 080319D: GROND Detection of the Optical Counterpart
  83. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  84. GRB 080319B: Spitzer Mid-infrared Observations
  85. GRB 080319C: Suzaku WAM observation of the prompt emission
  86. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  87. Radio Detection of GRB 080319B
  88. GRB 080320, Swift-BAT refined analysis
  89. GRB 080319D: GROND Observations
  90. GRB 080319B: TORTORA light curve
  91. GRB 080319B: optical upper limit
  92. GRB 080319D: optical upper limit
  93. GRB080319B: Time-Independent XRT Spectrum
  94. GRB 080319D, Swift-BAT refined analysis
  95. GRB 080319C: UVOT Observations
  96. GRB 080319B: UVOT Observations
  97. GRB 080319A: UVOT Observations
  98. GRB 080320: Swift XRT refined analysis
  99. GRB 080319B - CARMA mm Observations
  100. GRB 080320: Early Super-LOTIS Observations

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