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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"

36353 results found.

  1. GRB 060502: Swift-BAT refined analysis
  2. GRB060502: Gemini spectroscopy
  3. GRB 060502: APO Spectroscopic Observations
  4. GRB 060502: P60 Afterglow Confirmation
  5. GRB 060502: Swift detection of a burst with an optical counterpart
  6. GRB 060501: MDM Observations
  7. GRB060501: Super-LOTIS observations
  8. GRB 060501: Refined analysis of the Swift-BAT burst
  9. GRB060501: Swift XRT position
  10. GRB 060501: ROTSE-III Optical Limits
  11. GRB 060501: Swift detection of a burst
  12. IPN triangulation of GRB060429 (short/hard)
  13. Konus-Wind observation of GRB 060427B
  14. GRB060428B - SDSS Pre-Burst Observations
  15. GRB060428B: optical observation
  16. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  17. GRB 060428B: MDM Observations
  18. GRB 060428A: PROMPT Observations
  19. GRB 060427B: MASTER optical observations
  20. GRB 060427B: IPN localization of a short hard burst
  21. GRB 060428B: Refined analysis of the Swift-BAT burst
  22. GRB 060428B: Xinglong I-band limit
  23. GRB 060428B: KAIT observations
  24. GRB060425:MASTER optical limit
  25. GRB 051117A: Bright host galaxy not confirmed
  26. GRB 060428A: Refined analysis of the Swift-BAT burst
  27. GRB 060428b : Kiso R-band limit
  28. GRB060427:MASTER optical limit
  29. GRB 060428b: Optical afterglow candidate
  30. GRB 060428B: Swift detection of a burst
  31. GRB 060427: NIR observations
  32. GRB 060428: Swift detection of a burst
  33. GRB 060427: NOT observations
  34. GRB 060427: Swift/UVOT upper limits.
  35. GRB 060427: Refined analysis of the Swift-BAT burst
  36. GRB060418: Swift XRT Team Further Refined Analysis
  37. GRB060425:MASTER survey observations
  38. GRB 060427, optical observation
  39. GRB 060427: Swift detection of a burst
  40. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  41. An interactive program for GRB pseudo-redshift computations
  42. GRB060424: optical afterglow detection
  43. GRB060418: Further Analysis of MIKE Spectroscopy
  44. GRB 060424: Refined analysis of the Swift-BAT burst
  45. GRB 060424: Swift detection of a burst
  46. GRB 060421: TTT Observations
  47. GRB 060421: Swift-BAT Refined Analysis
  48. GRB 060421: Swift-XRT refined analysis
  49. GRB 060418: prediction of t_break
  50. GRB060418: optical observations
  51. Konus-Wind observation of GRB 060418
  52. GRB(?)060421:MASTER optical limit
  53. GRB(?)060421 : XRT position
  54. GRB(?) 060421: Swift detection of a burst
  55. Erratum of GCN 4983 for GRB 060418 IR follow-up
  56. GRB 060418 : IR afterglow observations
  57. GRB 060418 : Lulin Optical follow-up
  58. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  59. GRB 060418: Radio Observations
  60. GRB060418, BVRcIc field calibration
  61. GRB060418: Optical Observations
  62. GRB 060418: FRAM early afterglow observation
  63. GRB 060418: Refined Analysis of the Swift-BAT burst
  64. GRB060418: Swift XRT Team Refined Analysis
  65. GRB 060418, SMARTS continuing afterglow observations
  66. GRB 060418: PROMPT Detections
  67. GRB 060418, SMARTS optical/IR afterglow observations
  68. GRB060418: Magellan/MIKE Spectroscopic Redshift
  69. GRB060418 : LT optical afterglow observation
  70. GRB 060418: REM candidate afterglow
  71. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  72. GRB 060413: REM NIR Observations
  73. GRB 060413: Refined analysis of the Swift-BAT burst
  74. GRB 060413: Watcher UBVR observations
  75. GRB 060413: XRT refined analysis
  76. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  77. GRB 060413: Swift detection of a burst
  78. GRB060403: optical observations
  79. GRB 060403 Optical observations
  80. GRB 060403: MITSuME optical observation
  81. GRB060403: XRT refined analysis
  82. GRB 060403: Swift/UVOT upper limits
  83. GRB 060403: Refined analysis of the Swift-BAT burst
  84. GRB 060403: Swift detection of a burst
  85. GRB 060322: LNA optical limit
  86. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  87. GRB 060323 : WIDGET simultaneous optical observations
  88. GRB 060323: Early optical observation at Xinglong
  89. GRB060218, optical observations
  90. GRB 060322: Confirmation of Swift XRT afterglow
  91. GRB 060211A: optical observation
  92. GRB060323: optical limit
  93. GRB060211B: optical observation
  94. GRB060323: NOT optical observations
  95. GRB 060322: IAC80 optical observations
  96. GRB 060322: Swift XRT afterglow candidate
  97. GRB 060323: Swift/UVOT Observations
  98. GRB 060323: optical afterglow confirmed
  99. GRB060323: NOT observations
  100. GRB 060323: Optical Observations

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