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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

37574 results found.

  1. GRB 060507: Swift detection of a burst
  2. GRB 060429: Suzaku WAM observation
  3. GRB 060505: Swift XRT Team Refined Analysis
  4. GRB060425: new MASTER survey method
  5. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  6. GRB 060505: Swift XRT afterglow canditate position
  7. GRB 060502b: Second epoch Gemini observations
  8. GRB 060505: Swift-BAT detection of a weak burst
  9. GRB 060428B: spectroscopy
  10. GRB 060502B: optical observations
  11. GRB 060502B: AROMA refined photometric calibration
  12. GRB 060502B MDM Follow-up Observation
  13. GRB 060502b: Gemini imaging and spectroscopy
  14. GRB060502A, optical observation
  15. GRB 060502B: Swift/UVOT upper limits
  16. GRB 060502A: Swift/UVOT source detection
  17. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  18. GRB 060502B: MDM Optical Observation
  19. GRB 060502B: AROMA optical observations
  20. GRB 060502B: Refined analysis of the Swift-BAT short burst
  21. Short GRB 060502B: Tautenburg Observation
  22. GRB 060427B Milagro GeV/TeV Observations
  23. GRB 060502A: TTT Observations
  24. GRB 060501: P60 Observations and Candidate Retraction
  25. GRB 060502B: Xinglong optical observation
  26. GRB 060502B: MASTER optical observations
  27. GRB 060502B: Swift detection of a short burst
  28. GRB 060502: Swift-BAT refined analysis
  29. GRB060502: Gemini spectroscopy
  30. GRB 060502: APO Spectroscopic Observations
  31. GRB 060502: P60 Afterglow Confirmation
  32. GRB 060502: Swift detection of a burst with an optical counterpart
  33. GRB 060501: MDM Observations
  34. GRB060501: Super-LOTIS observations
  35. GRB 060501: Refined analysis of the Swift-BAT burst
  36. GRB060501: Swift XRT position
  37. GRB 060501: ROTSE-III Optical Limits
  38. GRB 060501: Swift detection of a burst
  39. IPN triangulation of GRB060429 (short/hard)
  40. Konus-Wind observation of GRB 060427B
  41. GRB060428B - SDSS Pre-Burst Observations
  42. GRB060428B: optical observation
  43. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  44. GRB 060428B: MDM Observations
  45. GRB 060428A: PROMPT Observations
  46. GRB 060427B: MASTER optical observations
  47. GRB 060427B: IPN localization of a short hard burst
  48. GRB 060428B: Refined analysis of the Swift-BAT burst
  49. GRB 060428B: Xinglong I-band limit
  50. GRB 060428B: KAIT observations
  51. GRB060425:MASTER optical limit
  52. GRB 051117A: Bright host galaxy not confirmed
  53. GRB 060428A: Refined analysis of the Swift-BAT burst
  54. GRB 060428b : Kiso R-band limit
  55. GRB060427:MASTER optical limit
  56. GRB 060428b: Optical afterglow candidate
  57. GRB 060428B: Swift detection of a burst
  58. GRB 060427: NIR observations
  59. GRB 060428: Swift detection of a burst
  60. GRB 060427: NOT observations
  61. GRB 060427: Swift/UVOT upper limits.
  62. GRB 060427: Refined analysis of the Swift-BAT burst
  63. GRB060418: Swift XRT Team Further Refined Analysis
  64. GRB060425:MASTER survey observations
  65. GRB 060427, optical observation
  66. GRB 060427: Swift detection of a burst
  67. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  68. An interactive program for GRB pseudo-redshift computations
  69. GRB060424: optical afterglow detection
  70. GRB060418: Further Analysis of MIKE Spectroscopy
  71. GRB 060424: Refined analysis of the Swift-BAT burst
  72. GRB 060424: Swift detection of a burst
  73. GRB 060421: TTT Observations
  74. GRB 060421: Swift-BAT Refined Analysis
  75. GRB 060421: Swift-XRT refined analysis
  76. GRB 060418: prediction of t_break
  77. GRB060418: optical observations
  78. Konus-Wind observation of GRB 060418
  79. GRB(?)060421:MASTER optical limit
  80. GRB(?)060421 : XRT position
  81. GRB(?) 060421: Swift detection of a burst
  82. Erratum of GCN 4983 for GRB 060418 IR follow-up
  83. GRB 060418 : IR afterglow observations
  84. GRB 060418 : Lulin Optical follow-up
  85. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  86. GRB 060418: Radio Observations
  87. GRB060418, BVRcIc field calibration
  88. GRB060418: Optical Observations
  89. GRB 060418: FRAM early afterglow observation
  90. GRB 060418: Refined Analysis of the Swift-BAT burst
  91. GRB060418: Swift XRT Team Refined Analysis
  92. GRB 060418, SMARTS continuing afterglow observations
  93. GRB 060418: PROMPT Detections
  94. GRB 060418, SMARTS optical/IR afterglow observations
  95. GRB060418: Magellan/MIKE Spectroscopic Redshift
  96. GRB060418 : LT optical afterglow observation
  97. GRB 060418: REM candidate afterglow
  98. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  99. GRB 060413: REM NIR Observations
  100. GRB 060413: Refined analysis of the Swift-BAT burst

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