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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"

24368 results found.

  1. GRB 080413a, SMARTS optical/IR afterglow observations
  2. GRB 080413B, Swift-BAT refined analysis
  3. GRB 080413A, Swift-BAT refined analysis
  4. GRB 080413: ROTSE-III Detection of Optical Counterpart
  5. GRB 080411, Swift-BAT refined analysis
  6. GRB 080411: Swift-XRT Refined Analysis
  7. Konus-Wind observation of GRB 080411
  8. GRB 080411: VLT redshift
  9. GRB080330: MAGIC telescope GeV observation
  10. GRB 080411: Swift detection of a bright burst
  11. GRB 080409: Swift-BAT refined analysis
  12. GRB 080330 optical observations
  13. GRB 080408: Analysis of AGILE Gamma-ray data
  14. GRB 080408: GRB Localization by SuperAGILE
  15. GRB 080319A: Early RAPTOR optical limits
  16. GRB 080319B: Potential Jet Break Observed by Swift-XRT and UVOT
  17. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  18. GRB 080325: optical upper limit
  19. GRB 080330: Prompt PROMPT Observations
  20. GRB 080319B: TORTORA light curve (Correction)
  21. GRB080328, RIMOTS optical upper limit
  22. GRB080330: optical observations
  23. GRB 080330, SMARTS optical/IR afterglow observations
  24. GRB 080328: Suzaku WAM observation of the prompt emission
  25. GRB080330: TNT optical observations
  26. GRB 080330, Swift-BAT refined analysis
  27. Konus-Wind observation of GRB 080328
  28. GRB080330: LOAO R-band Detection
  29. GRB 080330: Liverpool Telescope Optical observations
  30. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  31. GRB 080328, Swift-BAT refined analysis
  32. GRB 080325, Swift-BAT refined analysis
  33. GRB080328: Faulkes Telescope North observations
  34. GRB 080328: Swift detection of a burst with an optical counterpart
  35. GRB080310, late-time photometry with LBT
  36. GRB 080325: MITSuME Akeno optical upper limits
  37. GRB 080325: GROND Observations
  38. GRB080319B: optical observations
  39. GRB 080319C: Gemini-North spectroscopic redshift
  40. GRB 080325: Early observations from OSN
  41. GRB 080319D: GROND Detection of the Optical Counterpart
  42. GRB 080325: Swift detection of a burst
  43. GRB 080319B : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  44. IBAS Alert n. 5245: NOT a GRB
  45. GRB 080319C: Suzaku WAM observation of the prompt emission
  46. GRB 080320, Swift-BAT refined analysis
  47. GRB 080319B: Optical observation (Brno, CZ)
  48. GRB 080319D: GROND Observations
  49. GRB 080319B: TORTORA light curve
  50. GRB 080319B: optical upper limit
  51. GRB 080319D: optical upper limit
  52. GRB080319B: Time-Independent XRT Spectrum
  53. GRB 080319D, Swift-BAT refined analysis
  54. GRB 080319A: UVOT Observations
  55. GRB 080319B - CARMA mm Observations
  56. GRB 080320: optical limit
  57. Konus-Wind observation of GRB 080319C
  58. GRB 080319C, Swift-BAT refined analysis
  59. Konus-Wind observation of GRB 080319B
  60. GRB 080320: optical limit from IAC80
  61. GRB 080320: Swift detection of a burst
  62. GRB 080320: ROTSE-III Optical Limits
  63. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  64. GRB 080319B: RAPTOR observations of a naked eye burst
  65. GRB 080319A: Swift-XRT Team Refined Analysis
  66. GRB 080319B, Swift-BAT refined analysis
  67. GRB080319B: Prompt PROMPT Detections
  68. GRB 080319C: Swift-XRT Team Refined Analysis
  69. GRB 080319C: AGILE-MCAL observation of the prompt emission
  70. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  71. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  72. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  73. GRB 080319B: TORTORA synchronous observation
  74. GRB 080319A, Swift-BAT refined analysis
  75. GRB 080319B: REM early data
  76. GRB080319B Liverpool Telescope optical afterglow candidate
  77. GRB 080319B: REM observations
  78. Swift trigger 306323: Swift-BAT/XRT refined analysis
  79. GRB 080315: Optical observations
  80. GRB080310 : Optical observations by LOAO and Lulin
  81. GRB 080310: ROTSE-III Observations of Optical Counterpart
  82. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  83. GRB 080310: early RAPTOR multicolor observations
  84. GRB 080310, Swift-BAT refined analysis
  85. GRB 080310: Swift-XRT refined analysis
  86. GRB 080310, SMARTS optical/IR afterglow observations
  87. GRB 080310: REM observations
  88. GRB 080310 afterglow candidate (correction to UT time)
  89. GRB080229, optical upper limit (Correction)
  90. GRB080307, optical upper limit
  91. GRB080229, optical upper limit
  92. GRB 080307, Swift-BAT refined analysis
  93. GRB 080307: Gemini-N i-band observations - candidate afterglow
  94. GRB 080307, Preliminary Swift-BAT refined analysis
  95. GRB 080307: Optical observation with DMC/KANATA
  96. GRB 080303, Swift-BAT refined analysis
  97. GRB 080303: Rapid PROMPT Detections
  98. GRB 080303A: Faulkes Telescope South optical afterglow observations
  99. GRB 080303: Swift detection of a burst with optical afterglow
  100. GRB 080303A: ROTSE-III Optical Limits

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