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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"
  1. GRB 080414: RTT150 optical observations
  2. GRB 080414 Watcher observations
  3. GRB 080414: A long GRB detected by INTEGRAL
  4. VLA radio observations of GRB 080413B
  5. GRB 080413A: Gemini-South Spectroscopy
  6. GRB 080413B: Gemini-South Spectroscopy
  7. VLA radio observations of GRB 080413A
  8. IBAS Alert n. 5257 : not a GRB
  9. GRB 080413B: Ep,i-Eiso correlation
  10. GRB080413B
  11. Swift-BAT spectral lag analysis of GRB 080413B
  12. GRB 080413a, SMARTS optical/IR afterglow observations
  13. GRB 080413B: Swift XRT refined analysis
  14. GRB080413A: Swift/UVOT observations
  15. GRB 080413B, Swift-BAT refined analysis
  16. GRB 080413A: Swift-XRT refined analysis
  17. GRB 080413A, Swift-BAT refined analysis
  18. GRB 080413A Bootes observation
  19. GRB 080413A: VLT/UVES redshift
  20. GRB 080413B: VLT redshift
  21. GRB080413B: REM NIR & Optical Observation
  22. GRB 080413B: GROND detection of afterglow in all bands
  23. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  24. GRB 080413A: REM detection of the NIR Afterglow
  25. GRB 080413: Enhanced Swift-XRT position
  26. GRB 080413: TAROT Calern observatory optical observations
  27. GRB 080413: Swift detection of a burst with an optical afterglow
  28. GRB 080413: ROTSE-III Detection of Optical Counterpart
  29. GRB 080411: Swift/UVOT refined analysis
  30. GRB 080411, Swift-BAT refined analysis
  31. GRB 080411: Swift-XRT Refined Analysis
  32. Konus-Wind observation of GRB 080411
  33. GRB 080411: Enhanced Swift-XRT position
  34. GRB 080411: VLT redshift
  35. GRB 080411: GROND detection of optical afterglow candidate
  36. GRB080330: MAGIC telescope GeV observation
  37. GRB 080411: Swift detection of a bright burst
  38. GRB 080330: Swift-XRT refined position retraction
  39. GRB 080409: Swift-BAT refined analysis
  40. GRB 080408: GROND detection of optical/NIR afterglow candidate
  41. GRB 080330 optical observations
  42. Swift/UVOT observations of GRB080409
  43. GRB 080409: Swift XRT refined analysis
  44. UVOT/Swift Observations of GRB080408
  45. GRB 080408: Swift-XRT position of a possible afterglow
  46. GRB 080409: Enhanced Swift-XRT position
  47. GRB 080409: REM optical/NIR observations
  48. GRB 080409: Swift detection of a burst
  49. GRB 080408: Analysis of AGILE Gamma-ray data
  50. GRB 080408: GRB Localization by SuperAGILE
  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 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  58. GRB 080325: optical upper limit
  59. GRB 080328: GAO 150cm telescope Optical Observation
  60. GRB080330: Improved Swift XRT Position
  61. GRB 080330: Prompt PROMPT Observations
  62. GRB080330: optical observations
  63. GRB 080319B: TORTORA light curve (Correction)
  64. GRB080328, RIMOTS optical upper limit
  65. GRB080330: optical observations
  66. GRB080330: Swift XRT refined analysis
  67. GRB 080330: REM optical observations
  68. GRB 080330, SMARTS optical/IR afterglow observations
  69. GRB 080330 Swift-UVOT refined analysis
  70. GRB 080328: Suzaku WAM observation of the prompt emission
  71. GRB080330: TNT optical observations
  72. GRB 080330, Swift-BAT refined analysis
  73. Konus-Wind observation of GRB 080328
  74. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  75. GRB080330: LOAO R-band Detection
  76. GRB 080330: GROND Observations
  77. GRB 080330: NOT redshift
  78. GRB 080330: TAROT Calern observatory optical observations
  79. GRB 080330A: PAIRITEL Infrared Detections
  80. GRB 080330: error in reported XRT position
  81. GRB080330 - SDSS Pre-Burst Observations
  82. GRB 080330: Liverpool Telescope Optical observations
  83. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  84. GRB 080330: Swift detection of a burst with an optical counterpart
  85. GRB 080330: TAROT Calern observatory optical detection
  86. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  87. GRB 080328: BTA optical imaging and spectroscopy
  88. GRB 080328, Swift-BAT refined analysis
  89. GRB 080328: Swift XRT refined analysis
  90. GRB 080325, Swift-BAT refined analysis
  91. Swift/UVOT observations of GRB080328
  92. GRB080325 - I and z-band Imaging
  93. GRB080319B, BVRcIc field calibration
  94. GRB 080328: Enhanced Swift-XRT position
  95. GRB080328: Faulkes Telescope North observations
  96. GRB 080328: Swift detection of a burst with an optical counterpart
  97. GRB 080325: Subaru detection of NIR afterglow candidate
  98. GRB080310, late-time photometry with LBT
  99. GRB 080325: MITSuME Akeno optical upper limits
  100. GRB080325: XRT Refined Analysis

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