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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"

37565 results found.

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

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