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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"

45585 results found.

  1. GRB060502B: correction to XRT position
  2. GRB 060501: P60 Observations and Candidate Retraction
  3. GRB 060502B: Xinglong optical observation
  4. GRB 060502B: Swift detection of a short burst
  5. GRB060502: Swift-XRT refined analysis
  6. GRB 060502: Swift-BAT refined analysis
  7. GRB060502: Gemini spectroscopy
  8. GRB 060502: APO Spectroscopic Observations
  9. GRB060501: Swift UVOT followup observations
  10. GRB060502: Super-LOTIS Observations
  11. GRB 060502: P60 Afterglow Confirmation
  12. GRB 060502: Swift detection of a burst with an optical counterpart
  13. GRB 060501: MDM Observations
  14. GRB060501: Super-LOTIS observations
  15. GRB060501: P60 imaging and afterglow candidate
  16. GRB 060501: Refined analysis of the Swift-BAT burst
  17. GRB060501: Swift XRT position
  18. GRB 060501: ROTSE-III Optical Limits
  19. GRB 060501: Swift detection of a burst
  20. IPN triangulation of GRB060429 (short/hard)
  21. Konus-Wind observation of GRB 060427B
  22. GRB060428B - SDSS Pre-Burst Observations
  23. GRB060428B: optical observation
  24. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  25. GRB 060428B: MDM Observations
  26. GRB 060428A: PROMPT Observations
  27. GRB 060427B: MASTER optical observations
  28. GRB060428B: Swift XRT Team refined analysis
  29. GRB 060427B: IPN localization of a short hard burst
  30. GRB 060428B: Refined analysis of the Swift-BAT burst
  31. GRB 060428B: Xinglong I-band limit
  32. GRB 060428B: KAIT observations
  33. GRB060425:MASTER optical limit
  34. GRB 051117A: Bright host galaxy not confirmed
  35. GRB060428A: Swift/UVOT observations.
  36. GRB060428B, optical observation
  37. GRB 060428A: Refined analysis of the Swift-BAT burst
  38. GRB 060428b : Kiso R-band limit
  39. GRB 060428b: Optical afterglow candidate
  40. GRB060428A: Swift XRT Team refined analysis
  41. GRB 060428B: Swift detection of a burst
  42. GRB 060427: NIR observations
  43. GRB060427: Xinglong optical Observations
  44. GRB 060428: Swift detection of a burst
  45. GRB 060427: NOT observations
  46. GRB 060427: Swift/UVOT upper limits.
  47. GRB 060427: Refined analysis of the Swift-BAT burst
  48. GRB060427: Swift XRT Team refined analysis
  49. GRB060418: Swift XRT Team Further Refined Analysis
  50. GRB060425:MASTER survey observations
  51. GRB 060427, optical observation
  52. GRB 060427: Swift detection of a burst
  53. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  54. An interactive program for GRB pseudo-redshift computations
  55. GRB060424: optical afterglow detection
  56. GRB060418: Further Analysis of MIKE Spectroscopy
  57. GRB 060424: Refined analysis of the Swift-BAT burst
  58. GRB 060424: Swift detection of a burst
  59. GRB 060421: TTT Observations
  60. OT 060420: Likely Not a New Cosmic Transient
  61. No OT 060420 in MASCOT images
  62. Swift-BAT detection of Mrk 421
  63. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  64. GRB060421: Swift/UVOT 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 : XRT position
  71. Possible GRB060421: BART limits
  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: Swift/UVOT Observations
  80. GRB060418: Optical Observations
  81. GRB 060418: FRAM early afterglow observation
  82. GRB 060418: Refined Analysis of the Swift-BAT burst
  83. VLT/UVES observations of GRB060418
  84. GRB060418: Swift XRT Team Refined Analysis
  85. GRB 060418, SMARTS continuing afterglow observations
  86. GRB 060418: PROMPT Detections
  87. GRB 060418, SMARTS optical/IR afterglow observations
  88. GRB060418: Magellan/MIKE Spectroscopic Redshift
  89. GRB060418 : LT optical afterglow observation
  90. GRB 060418: REM candidate afterglow
  91. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  92. SGR 1900+14: Refined analysis of the Swift-BAT outburst
  93. GRB060413: Swift/UVOT upper limits
  94. GRB 060413: REM NIR Observations
  95. SGR 1900+14: Swift detection of an outburst
  96. GRB 060413: Refined analysis of the Swift-BAT burst
  97. GRB 060413: Watcher UBVR observations
  98. GRB 060413: XRT refined analysis
  99. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  100. GRB 060413: Swift detection of a burst

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