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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"

32489 results found.

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

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