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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"

24362 results found.

  1. Konus-Wind observation of GRB 080411
  2. GRB 080411: VLT redshift
  3. GRB080330: MAGIC telescope GeV observation
  4. GRB 080411: Swift detection of a bright burst
  5. GRB 080409: Swift-BAT refined analysis
  6. GRB 080330 optical observations
  7. GRB 080408: Analysis of AGILE Gamma-ray data
  8. GRB 080408: GRB Localization by SuperAGILE
  9. GRB 080319A: Early RAPTOR optical limits
  10. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  11. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  12. GRB 080325: optical upper limit
  13. GRB 080330: Prompt PROMPT Observations
  14. GRB 080319B: TORTORA light curve (Correction)
  15. GRB080328, RIMOTS optical upper limit
  16. GRB080330: optical observations
  17. GRB 080330, SMARTS optical/IR afterglow observations
  18. GRB 080328: Suzaku WAM observation of the prompt emission
  19. GRB080330: TNT optical observations
  20. GRB 080330, Swift-BAT refined analysis
  21. Konus-Wind observation of GRB 080328
  22. GRB080330: LOAO R-band Detection
  23. GRB 080330: Liverpool Telescope Optical observations
  24. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  25. GRB 080328, Swift-BAT refined analysis
  26. GRB 080325, Swift-BAT refined analysis
  27. GRB080328: Faulkes Telescope North observations
  28. GRB 080328: Swift detection of a burst with an optical counterpart
  29. GRB080310, late-time photometry with LBT
  30. GRB 080325: MITSuME Akeno optical upper limits
  31. GRB 080325: GROND Observations
  32. GRB080319B: optical observations
  33. GRB 080319C: Gemini-North spectroscopic redshift
  34. GRB 080325: Early observations from OSN
  35. GRB 080319D: GROND Detection of the Optical Counterpart
  36. GRB 080325: Swift detection of a burst
  37. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  38. IBAS Alert n. 5245: NOT a GRB
  39. GRB 080319C: Suzaku WAM observation of the prompt emission
  40. GRB 080320, Swift-BAT refined analysis
  41. GRB 080319B: Optical observation (Brno, CZ)
  42. GRB 080319D: GROND Observations
  43. GRB 080319B: TORTORA light curve
  44. GRB 080319B: optical upper limit
  45. GRB 080319D: optical upper limit
  46. GRB080319B: Time-Independent XRT Spectrum
  47. GRB 080319D, Swift-BAT refined analysis
  48. GRB 080319A: UVOT Observations
  49. GRB 080319B - CARMA mm Observations
  50. GRB 080320: optical limit
  51. Konus-Wind observation of GRB 080319C
  52. GRB 080319C, Swift-BAT refined analysis
  53. Konus-Wind observation of GRB 080319B
  54. GRB 080320: optical limit from IAC80
  55. GRB 080320: Swift detection of a burst
  56. GRB 080320: ROTSE-III Optical Limits
  57. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  58. GRB 080319B: RAPTOR observations of a naked eye burst
  59. GRB 080319A: Swift-XRT Team Refined Analysis
  60. GRB 080319B, Swift-BAT refined analysis
  61. GRB080319B: Prompt PROMPT Detections
  62. GRB 080319C: Swift-XRT Team Refined Analysis
  63. GRB 080319C: AGILE-MCAL observation of the prompt emission
  64. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  65. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  66. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  67. GRB 080319B: TORTORA synchronous observation
  68. GRB 080319A, Swift-BAT refined analysis
  69. GRB 080319B: REM early data
  70. GRB080319B Liverpool Telescope optical afterglow candidate
  71. GRB 080319B: REM observations
  72. Swift trigger 306323: Swift-BAT/XRT refined analysis
  73. GRB 080315: Optical observations
  74. GRB080310 : Optical observations by LOAO and Lulin
  75. GRB 080310: ROTSE-III Observations of Optical Counterpart
  76. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  77. GRB 080310: early RAPTOR multicolor observations
  78. GRB 080310, Swift-BAT refined analysis
  79. GRB 080310: Swift-XRT refined analysis
  80. GRB 080310, SMARTS optical/IR afterglow observations
  81. GRB 080310: REM observations
  82. GRB 080310 afterglow candidate (correction to UT time)
  83. GRB080229, optical upper limit (Correction)
  84. GRB080307, optical upper limit
  85. GRB080229, optical upper limit
  86. GRB 080307, Swift-BAT refined analysis
  87. GRB 080307: Gemini-N i-band observations - candidate afterglow
  88. GRB 080307, Preliminary Swift-BAT refined analysis
  89. GRB 080307: Optical observation with DMC/KANATA
  90. GRB 080303, Swift-BAT refined analysis
  91. GRB 080303: Rapid PROMPT Detections
  92. GRB 080303A: Faulkes Telescope South optical afterglow observations
  93. GRB 080303: Swift detection of a burst with optical afterglow
  94. GRB 080303A: ROTSE-III Optical Limits
  95. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  96. GRB 080229, Swift-BAT refined analysis
  97. GRB 080229: Faulkes Telescope South optical limit
  98. GRB 080229A: ROTSE-III Optical Limits
  99. GRB 080229: Swift detection of a bright burst
  100. Early optical shallow decay in GRB 071112C

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