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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"

36144 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. GRB 060501: Refined analysis of the Swift-BAT burst
  6. GRB060501: Swift XRT position
  7. GRB 060501: ROTSE-III Optical Limits
  8. GRB 060501: Swift detection of a burst
  9. IPN triangulation of GRB060429 (short/hard)
  10. Konus-Wind observation of GRB 060427B
  11. GRB060428B - SDSS Pre-Burst Observations
  12. GRB060428B: optical observation
  13. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  14. GRB 060428B: MDM Observations
  15. GRB 060428A: PROMPT Observations
  16. GRB 060427B: MASTER optical observations
  17. GRB 060427B: IPN localization of a short hard burst
  18. GRB 060428B: Refined analysis of the Swift-BAT burst
  19. GRB 060428B: Xinglong I-band limit
  20. GRB 060428B: KAIT observations
  21. GRB060425:MASTER optical limit
  22. GRB 051117A: Bright host galaxy not confirmed
  23. GRB 060428A: Refined analysis of the Swift-BAT burst
  24. GRB 060428b : Kiso R-band limit
  25. GRB060427:MASTER optical limit
  26. GRB 060428b: Optical afterglow candidate
  27. GRB 060428B: Swift detection of a burst
  28. GRB 060427: NIR observations
  29. GRB 060428: Swift detection of a burst
  30. GRB 060427: NOT observations
  31. GRB 060427: Swift/UVOT upper limits.
  32. GRB 060427: Refined analysis of the Swift-BAT burst
  33. GRB060418: Swift XRT Team Further Refined Analysis
  34. GRB060425:MASTER survey observations
  35. GRB 060427, optical observation
  36. GRB 060427: Swift detection of a burst
  37. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  38. An interactive program for GRB pseudo-redshift computations
  39. GRB060424: optical afterglow detection
  40. GRB060418: Further Analysis of MIKE Spectroscopy
  41. GRB 060424: Refined analysis of the Swift-BAT burst
  42. GRB 060424: Swift detection of a burst
  43. GRB 060421: TTT Observations
  44. GRB 060421: Swift-BAT Refined Analysis
  45. GRB 060421: Swift-XRT refined analysis
  46. GRB 060418: prediction of t_break
  47. GRB060418: optical observations
  48. Konus-Wind observation of GRB 060418
  49. GRB(?)060421:MASTER optical limit
  50. GRB(?)060421 : XRT position
  51. GRB(?) 060421: Swift detection of a burst
  52. Erratum of GCN 4983 for GRB 060418 IR follow-up
  53. GRB 060418 : IR afterglow observations
  54. GRB 060418 : Lulin Optical follow-up
  55. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  56. GRB 060418: Radio Observations
  57. GRB060418, BVRcIc field calibration
  58. GRB060418: Optical Observations
  59. GRB 060418: FRAM early afterglow observation
  60. GRB 060418: Refined Analysis of the Swift-BAT burst
  61. GRB060418: Swift XRT Team Refined Analysis
  62. GRB 060418, SMARTS continuing afterglow observations
  63. GRB 060418: PROMPT Detections
  64. GRB 060418, SMARTS optical/IR afterglow observations
  65. GRB060418: Magellan/MIKE Spectroscopic Redshift
  66. GRB060418 : LT optical afterglow observation
  67. GRB 060418: REM candidate afterglow
  68. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  69. GRB 060413: REM NIR Observations
  70. GRB 060413: Refined analysis of the Swift-BAT burst
  71. GRB 060413: Watcher UBVR observations
  72. GRB 060413: XRT refined analysis
  73. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  74. GRB 060413: Swift detection of a burst
  75. GRB060403: optical observations
  76. GRB 060403 Optical observations
  77. GRB 060403: MITSuME optical observation
  78. GRB060403: XRT refined analysis
  79. GRB 060403: Swift/UVOT upper limits
  80. GRB 060403: Refined analysis of the Swift-BAT burst
  81. GRB 060403: Swift detection of a burst
  82. GRB 060322: LNA optical limit
  83. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  84. GRB 060323 : WIDGET simultaneous optical observations
  85. GRB 060323: Early optical observation at Xinglong
  86. GRB060218, optical observations
  87. GRB 060322: Confirmation of Swift XRT afterglow
  88. GRB 060211A: optical observation
  89. GRB060323: optical limit
  90. GRB060211B: optical observation
  91. GRB060323: NOT optical observations
  92. GRB 060322: IAC80 optical observations
  93. GRB 060322: Swift XRT afterglow candidate
  94. GRB 060323: Swift/UVOT Observations
  95. GRB 060323: optical afterglow confirmed
  96. GRB060323: NOT observations
  97. GRB 060323: Optical Observations
  98. GRB 060323: Tautenburg OT candidate retraction
  99. GRB 060323: Refined analysis of the Swift-BAT burst
  100. GRB 060323: optical observations at TNG

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