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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"

44490 results found.

  1. GRB 080413B: VLT redshift
  2. GRB080413B: REM NIR & Optical Observation
  3. GRB 080413B: GROND detection of afterglow in all bands
  4. GRB 080413B: Swift detection of a possibly short burst with optical counterpart
  5. GRB 080413A: REM detection of the NIR Afterglow
  6. GRB 080413: Enhanced Swift-XRT position
  7. GRB 080413: TAROT Calern observatory optical observations
  8. GRB 080413: Swift detection of a burst with an optical afterglow
  9. GRB 080413: ROTSE-III Detection of Optical Counterpart
  10. GRB 080411: Swift/UVOT refined analysis
  11. GRB 080411, Swift-BAT refined analysis
  12. GRB 080411: Swift-XRT Refined Analysis
  13. Konus-Wind observation of GRB 080411
  14. GRB 080411: Enhanced Swift-XRT position
  15. GRB 080411: VLT redshift
  16. GRB 080411: GROND detection of optical afterglow candidate
  17. GRB080330: MAGIC telescope GeV observation
  18. GRB 080411: Swift detection of a bright burst
  19. GRB 080330: Swift-XRT refined position retraction
  20. GRB 080409: Swift-BAT refined analysis
  21. GRB 080408: GROND detection of optical/NIR afterglow candidate
  22. GRB 080330 optical observations
  23. Swift/UVOT observations of GRB080409
  24. GRB 080409: Swift XRT refined analysis
  25. UVOT/Swift Observations of GRB080408
  26. GRB 080408: Swift-XRT position of a possible afterglow
  27. GRB 080409: Enhanced Swift-XRT position
  28. GRB 080409: REM optical/NIR observations
  29. GRB 080409: Swift detection of a burst
  30. GRB 080408: Analysis of AGILE Gamma-ray data
  31. GRB 080408: GRB Localization by SuperAGILE
  32. GRB 080319A: Early RAPTOR optical limits
  33. GRB 080319B: HST observations
  34. GRB 080330: RAPTOR detection of prompt optical flash
  35. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  36. GRB 080405: Swift-BAT refined analysis
  37. GRB 080405: Swift-XRT position
  38. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  39. GRB 080325: optical upper limit
  40. GRB 080328: GAO 150cm telescope Optical Observation
  41. GRB080330: Improved Swift XRT Position
  42. GRB 080330: Prompt PROMPT Observations
  43. GRB080330: optical observations
  44. GRB 080319B: TORTORA light curve (Correction)
  45. GRB080328, RIMOTS optical upper limit
  46. GRB080330: optical observations
  47. GRB080330: Swift XRT refined analysis
  48. GRB 080330: REM optical observations
  49. GRB 080330, SMARTS optical/IR afterglow observations
  50. GRB 080330 Swift-UVOT refined analysis
  51. GRB 080328: Suzaku WAM observation of the prompt emission
  52. GRB080330: TNT optical observations
  53. GRB 080330, Swift-BAT refined analysis
  54. Konus-Wind observation of GRB 080328
  55. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  56. GRB080330: LOAO R-band Detection
  57. GRB 080330: GROND Observations
  58. GRB 080330: NOT redshift
  59. GRB 080330: TAROT Calern observatory optical observations
  60. GRB 080330A: PAIRITEL Infrared Detections
  61. GRB 080330: error in reported XRT position
  62. GRB080330 - SDSS Pre-Burst Observations
  63. GRB 080330: Liverpool Telescope Optical observations
  64. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  65. GRB 080330: Swift detection of a burst with an optical counterpart
  66. GRB 080330: TAROT Calern observatory optical detection
  67. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  68. GRB 080328: BTA optical imaging and spectroscopy
  69. GRB 080328, Swift-BAT refined analysis
  70. GRB 080328: Swift XRT refined analysis
  71. GRB 080325, Swift-BAT refined analysis
  72. Swift/UVOT observations of GRB080328
  73. GRB080325 - I and z-band Imaging
  74. GRB080319B, BVRcIc field calibration
  75. GRB 080328: Enhanced Swift-XRT position
  76. GRB080328: Faulkes Telescope North observations
  77. GRB 080328: Swift detection of a burst with an optical counterpart
  78. GRB 080325: Subaru detection of NIR afterglow candidate
  79. GRB080310, late-time photometry with LBT
  80. GRB 080325: MITSuME Akeno optical upper limits
  81. GRB080325: XRT Refined Analysis
  82. GRB 080325: GROND Observations
  83. GRB080319B: optical observations
  84. GRB 080325: Swift/UVOT Upper Limits
  85. GRB 080319C: Gemini-North spectroscopic redshift
  86. GRB 080325: Early observations from OSN
  87. GRB 080325: NIR afterglow candidate
  88. GRB 080319D: GROND Detection of the Optical Counterpart
  89. GRB 080325: Enhanced Swift-XRT position
  90. GRB 080325: Swift detection of a burst
  91. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  92. IBAS Alert n. 5245: NOT a GRB
  93. GRB 080319B: Spitzer Mid-infrared Observations
  94. GRB 080319C: Suzaku WAM observation of the prompt emission
  95. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  96. Radio Detection of GRB 080319B
  97. GRB 080320, Swift-BAT refined analysis
  98. GRB 080319B: Optical observation (Brno, CZ)
  99. GRB 080319D: GROND Observations
  100. GRB 080319B: TORTORA light curve

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