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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"

35264 results found.

  1. GRB 060502B: AROMA refined photometric calibration
  2. GRB 060502B MDM Follow-up Observation
  3. GRB 060502b: Gemini imaging and spectroscopy
  4. GRB060502A, optical observation
  5. GRB 060502B: Swift/UVOT upper limits
  6. GRB 060502A: Swift/UVOT source detection
  7. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  8. GRB 060502B: MDM Optical Observation
  9. GRB 060502B: AROMA optical observations
  10. GRB 060502B: Refined analysis of the Swift-BAT short burst
  11. Short GRB 060502B: Tautenburg Observation
  12. GRB 060427B Milagro GeV/TeV Observations
  13. GRB 060502A: TTT Observations
  14. GRB 060501: P60 Observations and Candidate Retraction
  15. GRB 060502B: Xinglong optical observation
  16. GRB 060502B: MASTER optical observations
  17. GRB 060502B: Swift detection of a short burst
  18. GRB 060502: Swift-BAT refined analysis
  19. GRB060502: Gemini spectroscopy
  20. GRB 060502: APO Spectroscopic Observations
  21. GRB 060502: P60 Afterglow Confirmation
  22. GRB 060502: Swift detection of a burst with an optical counterpart
  23. GRB 060501: MDM Observations
  24. GRB060501: Super-LOTIS observations
  25. GRB 060501: Refined analysis of the Swift-BAT burst
  26. GRB060501: Swift XRT position
  27. GRB 060501: ROTSE-III Optical Limits
  28. GRB 060501: Swift detection of a burst
  29. IPN triangulation of GRB060429 (short/hard)
  30. Konus-Wind observation of GRB 060427B
  31. GRB060428B - SDSS Pre-Burst Observations
  32. GRB060428B: optical observation
  33. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  34. GRB 060428B: MDM Observations
  35. GRB 060428A: PROMPT Observations
  36. GRB 060427B: MASTER optical observations
  37. GRB 060427B: IPN localization of a short hard burst
  38. GRB 060428B: Refined analysis of the Swift-BAT burst
  39. GRB 060428B: Xinglong I-band limit
  40. GRB 060428B: KAIT observations
  41. GRB060425:MASTER optical limit
  42. GRB 051117A: Bright host galaxy not confirmed
  43. GRB 060428A: Refined analysis of the Swift-BAT burst
  44. GRB 060428b : Kiso R-band limit
  45. GRB060427:MASTER optical limit
  46. GRB 060428b: Optical afterglow candidate
  47. GRB 060428B: Swift detection of a burst
  48. GRB 060427: NIR observations
  49. GRB 060428: Swift detection of a burst
  50. GRB 060427: NOT observations
  51. GRB 060427: Swift/UVOT upper limits.
  52. GRB 060427: Refined analysis of the Swift-BAT burst
  53. GRB060418: Swift XRT Team Further Refined Analysis
  54. GRB060425:MASTER survey observations
  55. GRB 060427, optical observation
  56. GRB 060427: Swift detection of a burst
  57. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  58. An interactive program for GRB pseudo-redshift computations
  59. GRB060424: optical afterglow detection
  60. GRB060418: Further Analysis of MIKE Spectroscopy
  61. GRB 060424: Refined analysis of the Swift-BAT burst
  62. GRB 060424: Swift detection of a burst
  63. GRB 060421: TTT Observations
  64. GRB 060421: Swift-BAT Refined Analysis
  65. GRB 060421: Swift-XRT refined analysis
  66. GRB 060418: prediction of t_break
  67. GRB060418: optical observations
  68. Konus-Wind observation of GRB 060418
  69. GRB(?)060421:MASTER optical limit
  70. GRB(?)060421 : XRT position
  71. GRB(?) 060421: Swift detection of a burst
  72. Erratum of GCN 4983 for GRB 060418 IR follow-up
  73. GRB 060418 : IR afterglow observations
  74. GRB 060418 : Lulin Optical follow-up
  75. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  76. GRB 060418: Radio Observations
  77. GRB060418, BVRcIc field calibration
  78. GRB060418: Optical Observations
  79. GRB 060418: FRAM early afterglow observation
  80. GRB 060418: Refined Analysis of the Swift-BAT burst
  81. GRB060418: Swift XRT Team Refined Analysis
  82. GRB 060418, SMARTS continuing afterglow observations
  83. GRB 060418: PROMPT Detections
  84. GRB 060418, SMARTS optical/IR afterglow observations
  85. GRB060418: Magellan/MIKE Spectroscopic Redshift
  86. GRB060418 : LT optical afterglow observation
  87. GRB 060418: REM candidate afterglow
  88. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  89. GRB 060413: REM NIR Observations
  90. GRB 060413: Refined analysis of the Swift-BAT burst
  91. GRB 060413: Watcher UBVR observations
  92. GRB 060413: XRT refined analysis
  93. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  94. GRB 060413: Swift detection of a burst
  95. GRB060403: optical observations
  96. GRB 060403 Optical observations
  97. GRB 060403: MITSuME optical observation
  98. GRB060403: XRT refined analysis
  99. GRB 060403: Swift/UVOT upper limits
  100. GRB 060403: Refined analysis of the Swift-BAT burst

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