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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"

45674 results found.

  1. GRB 060502: P60 Afterglow Confirmation
  2. GRB 060502: Swift detection of a burst with an optical counterpart
  3. GRB 060501: MDM Observations
  4. GRB060501: Super-LOTIS observations
  5. GRB060501: P60 imaging and afterglow candidate
  6. GRB 060501: Refined analysis of the Swift-BAT burst
  7. GRB060501: Swift XRT position
  8. GRB 060501: ROTSE-III Optical Limits
  9. GRB 060501: Swift detection of a burst
  10. IPN triangulation of GRB060429 (short/hard)
  11. Konus-Wind observation of GRB 060427B
  12. GRB060428B - SDSS Pre-Burst Observations
  13. GRB060428B: optical observation
  14. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  15. GRB 060428B: MDM Observations
  16. GRB 060428A: PROMPT Observations
  17. GRB 060427B: MASTER optical observations
  18. GRB060428B: Swift XRT Team refined analysis
  19. GRB 060427B: IPN localization of a short hard burst
  20. GRB 060428B: Refined analysis of the Swift-BAT burst
  21. GRB 060428B: Xinglong I-band limit
  22. GRB 060428B: KAIT observations
  23. GRB060425:MASTER optical limit
  24. GRB 051117A: Bright host galaxy not confirmed
  25. GRB060428A: Swift/UVOT observations.
  26. GRB060428B, optical observation
  27. GRB 060428A: Refined analysis of the Swift-BAT burst
  28. GRB 060428b : Kiso R-band limit
  29. GRB 060428b: Optical afterglow candidate
  30. GRB060428A: Swift XRT Team refined analysis
  31. GRB 060428B: Swift detection of a burst
  32. GRB 060427: NIR observations
  33. GRB060427: Xinglong optical Observations
  34. GRB 060428: Swift detection of a burst
  35. GRB 060427: NOT observations
  36. GRB 060427: Swift/UVOT upper limits.
  37. GRB 060427: Refined analysis of the Swift-BAT burst
  38. GRB060427: Swift XRT Team refined analysis
  39. GRB060418: Swift XRT Team Further Refined Analysis
  40. GRB060425:MASTER survey observations
  41. GRB 060427, optical observation
  42. GRB 060427: Swift detection of a burst
  43. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  44. An interactive program for GRB pseudo-redshift computations
  45. GRB060424: optical afterglow detection
  46. GRB060418: Further Analysis of MIKE Spectroscopy
  47. GRB 060424: Refined analysis of the Swift-BAT burst
  48. GRB 060424: Swift detection of a burst
  49. GRB 060421: TTT Observations
  50. OT 060420: Likely Not a New Cosmic Transient
  51. No OT 060420 in MASCOT images
  52. Swift-BAT detection of Mrk 421
  53. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  54. GRB060421: Swift/UVOT observations
  55. GRB 060421: Swift-BAT Refined Analysis
  56. GRB 060421: Swift-XRT refined analysis
  57. GRB 060418: prediction of t_break
  58. GRB060418: optical observations
  59. Konus-Wind observation of GRB 060418
  60. GRB(?)060421 : XRT position
  61. Possible GRB060421: BART limits
  62. GRB(?) 060421: Swift detection of a burst
  63. Erratum of GCN 4983 for GRB 060418 IR follow-up
  64. GRB 060418 : IR afterglow observations
  65. GRB 060418 : Lulin Optical follow-up
  66. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  67. GRB 060418: Radio Observations
  68. GRB060418, BVRcIc field calibration
  69. GRB060418: Swift/UVOT Observations
  70. GRB060418: Optical Observations
  71. GRB 060418: FRAM early afterglow observation
  72. GRB 060418: Refined Analysis of the Swift-BAT burst
  73. VLT/UVES observations of GRB060418
  74. GRB060418: Swift XRT Team Refined Analysis
  75. GRB 060418, SMARTS continuing afterglow observations
  76. GRB 060418: PROMPT Detections
  77. GRB 060418, SMARTS optical/IR afterglow observations
  78. GRB060418: Magellan/MIKE Spectroscopic Redshift
  79. GRB060418 : LT optical afterglow observation
  80. GRB 060418: REM candidate afterglow
  81. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  82. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  83. GRB060413: Swift/UVOT upper limits
  84. GRB 060413: REM NIR Observations
  85. SGR 1900+14: Swift detection of an outburst
  86. GRB 060413: Refined analysis of the Swift-BAT burst
  87. GRB 060413: Watcher UBVR observations
  88. GRB 060413: XRT refined analysis
  89. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  90. GRB 060413: Swift detection of a burst
  91. GRB060403: optical observations
  92. GRB 060403 Optical observations
  93. GRB 060403: MITSuME optical observation
  94. GRB060403: Optical Limit
  95. GRB060403: XRT refined analysis
  96. GRB 060403: Swift/UVOT upper limits
  97. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  98. SGR 1900+14: BAT observations
  99. GRB 060403: Refined analysis of the Swift-BAT burst
  100. GRB060403: Swift XRT refined position

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