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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"

36682 results found.

  1. GRB 060507: BART limit
  2. GRB 060507: Final Refined analysis of the Swift-BAT burst
  3. GRB 060507: Swift-BAT Refined Analysis
  4. GRB 060505: PROMPT Observations
  5. GRB 060507: Swift/UVOT Upper Limits
  6. GRB 060507: Swift XRT Team Refined Analysis
  7. GRB 060507: MDM Optical Upper Limit
  8. GRB060507: Swift XRT position
  9. GRB 060507: Swift detection of a burst
  10. GRB 060429: Suzaku WAM observation
  11. GRB 060505: Swift XRT Team Refined Analysis
  12. GRB060425: new MASTER survey method
  13. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  14. GRB 060505: Swift XRT afterglow canditate position
  15. GRB 060502b: Second epoch Gemini observations
  16. GRB 060505: Swift-BAT detection of a weak burst
  17. GRB 060428B: spectroscopy
  18. GRB 060502B: optical observations
  19. GRB 060502B: AROMA refined photometric calibration
  20. GRB 060502B MDM Follow-up Observation
  21. GRB 060502b: Gemini imaging and spectroscopy
  22. GRB060502A, optical observation
  23. GRB 060502B: Swift/UVOT upper limits
  24. GRB 060502A: Swift/UVOT source detection
  25. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  26. GRB 060502B: MDM Optical Observation
  27. GRB 060502B: AROMA optical observations
  28. GRB 060502B: Refined analysis of the Swift-BAT short burst
  29. Short GRB 060502B: Tautenburg Observation
  30. GRB 060427B Milagro GeV/TeV Observations
  31. GRB 060502A: TTT Observations
  32. GRB 060501: P60 Observations and Candidate Retraction
  33. GRB 060502B: Xinglong optical observation
  34. GRB 060502B: MASTER optical observations
  35. GRB 060502B: Swift detection of a short burst
  36. GRB 060502: Swift-BAT refined analysis
  37. GRB060502: Gemini spectroscopy
  38. GRB 060502: APO Spectroscopic Observations
  39. GRB 060502: P60 Afterglow Confirmation
  40. GRB 060502: Swift detection of a burst with an optical counterpart
  41. GRB 060501: MDM Observations
  42. GRB060501: Super-LOTIS observations
  43. GRB 060501: Refined analysis of the Swift-BAT burst
  44. GRB060501: Swift XRT position
  45. GRB 060501: ROTSE-III Optical Limits
  46. GRB 060501: Swift detection of a burst
  47. IPN triangulation of GRB060429 (short/hard)
  48. Konus-Wind observation of GRB 060427B
  49. GRB060428B - SDSS Pre-Burst Observations
  50. GRB060428B: optical observation
  51. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  52. GRB 060428B: MDM Observations
  53. GRB 060428A: PROMPT Observations
  54. GRB 060427B: MASTER optical observations
  55. GRB 060427B: IPN localization of a short hard burst
  56. GRB 060428B: Refined analysis of the Swift-BAT burst
  57. GRB 060428B: Xinglong I-band limit
  58. GRB 060428B: KAIT observations
  59. GRB060425:MASTER optical limit
  60. GRB 051117A: Bright host galaxy not confirmed
  61. GRB 060428A: Refined analysis of the Swift-BAT burst
  62. GRB 060428b : Kiso R-band limit
  63. GRB060427:MASTER optical limit
  64. GRB 060428b: Optical afterglow candidate
  65. GRB 060428B: Swift detection of a burst
  66. GRB 060427: NIR observations
  67. GRB 060428: Swift detection of a burst
  68. GRB 060427: NOT observations
  69. GRB 060427: Swift/UVOT upper limits.
  70. GRB 060427: Refined analysis of the Swift-BAT burst
  71. GRB060418: Swift XRT Team Further Refined Analysis
  72. GRB060425:MASTER survey observations
  73. GRB 060427, optical observation
  74. GRB 060427: Swift detection of a burst
  75. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  76. An interactive program for GRB pseudo-redshift computations
  77. GRB060424: optical afterglow detection
  78. GRB060418: Further Analysis of MIKE Spectroscopy
  79. GRB 060424: Refined analysis of the Swift-BAT burst
  80. GRB 060424: Swift detection of a burst
  81. GRB 060421: TTT Observations
  82. GRB 060421: Swift-BAT Refined Analysis
  83. GRB 060421: Swift-XRT refined analysis
  84. GRB 060418: prediction of t_break
  85. GRB060418: optical observations
  86. Konus-Wind observation of GRB 060418
  87. GRB(?)060421:MASTER optical limit
  88. GRB(?)060421 : XRT position
  89. GRB(?) 060421: Swift detection of a burst
  90. Erratum of GCN 4983 for GRB 060418 IR follow-up
  91. GRB 060418 : IR afterglow observations
  92. GRB 060418 : Lulin Optical follow-up
  93. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  94. GRB 060418: Radio Observations
  95. GRB060418, BVRcIc field calibration
  96. GRB060418: Optical Observations
  97. GRB 060418: FRAM early afterglow observation
  98. GRB 060418: Refined Analysis of the Swift-BAT burst
  99. GRB060418: Swift XRT Team Refined Analysis
  100. GRB 060418, SMARTS continuing afterglow observations

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