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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"

16037 results found.

  1. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  2. GRB060418: optical observations
  3. GRB 060428a, SMARTS optical/IR afterglow detection
  4. GRB 060510B: Swift/UVOT Upper Limits
  5. GRB 060510b: Redshift
  6. GRB060510B : Faulkes North Telescope detection
  7. GRB 060510b: Gemini NIR observations
  8. GRB 060510b: NIR observations
  9. GRB 060510B: MDM Observations and candidate OT
  10. GRB 060510: Swift detection of a burst with optical transient
  11. GRB060507: optical afterglow detection
  12. GRB060502B: improvement in the XRT afterglow position
  13. GRB 060507: Swift/UVOT Upper Limits
  14. GRB 060507: MDM Optical Upper Limit
  15. GRB060425: new MASTER survey method
  16. GRB 060502b: Second epoch Gemini observations
  17. GRB 060428B: spectroscopy
  18. GRB 060502B: optical observations
  19. GRB060502A, optical observation
  20. GRB 060502B: MDM Optical Observation
  21. GRB 060502B: AROMA optical observations
  22. GRB 060502B: Xinglong optical observation
  23. GRB 060502B: MASTER optical observations
  24. GRB060502: Gemini spectroscopy
  25. GRB060501: Swift UVOT followup observations
  26. GRB 060502: P60 Afterglow Confirmation
  27. GRB 060502: Swift detection of a burst with an optical counterpart
  28. GRB060501: Super-LOTIS observations
  29. GRB 060501: ROTSE-III Optical Limits
  30. GRB060428B: optical observation
  31. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  32. GRB 060428B: MDM Observations
  33. GRB 060427B: MASTER optical observations
  34. GRB060428B: Swift XRT Team refined analysis
  35. GRB 060428B: KAIT observations
  36. GRB060425:MASTER optical limit
  37. GRB060428A: Swift/UVOT observations.
  38. GRB060428B, optical observation
  39. GRB060427:MASTER optical limit
  40. GRB 060428b: Optical afterglow candidate
  41. GRB060427: Xinglong optical Observations
  42. GRB 060427: NOT observations
  43. GRB 060427, optical observation
  44. GRB060424: optical afterglow detection
  45. No OT 060420 in MASCOT images
  46. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  47. GRB060418: optical observations
  48. Konus-Wind observation of GRB 060418
  49. GRB(?)060421:MASTER optical limit
  50. Possible GRB060421: BART limits
  51. GRB 060418 : Lulin Optical follow-up
  52. GRB 060418: Radio Observations
  53. GRB060418: Optical Observations
  54. GRB 060418, SMARTS optical/IR afterglow observations
  55. GRB060418 : LT optical afterglow observation
  56. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  57. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  58. GRB060403: optical observations
  59. GRB 060403 Optical observations
  60. GRB 060403: MITSuME optical observation
  61. GRB060403: Optical Limit
  62. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  63. HETE trigger H4044: RTT150 optical observations
  64. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  65. HETE Trigger 4043: ROTSE-III Optical Limits
  66. H4043, an unusual high-energy transient observed by HETE
  67. GRB 060322: LNA optical limit
  68. GRB 060218SN 2006aj: optical observations at Rozhen Observatory
  69. GRB 060323 : WIDGET simultaneous optical observations
  70. GRB 060323: Early optical observation at Xinglong
  71. GRB060218, optical observations
  72. GRB 060211A: optical observation
  73. GRB060323: optical limit
  74. GRB060211B: optical observation
  75. GRB060323: NOT optical observations
  76. GRB 060322: IAC80 optical observations
  77. GRB060323: P60 Observations
  78. GRB 060323: Swift/UVOT Observations
  79. GRB 060323: optical afterglow confirmed
  80. GRB060323: NOT observations
  81. GRB 060323: Optical Observations
  82. GRB 060323: optical observations at TNG
  83. GRB060323, optical observation
  84. GRB 060323: Swift detection of a burst with a possible optical afterglow
  85. GRB060219: optical observation
  86. GRB060206: optical observation
  87. GRB060218/SN2006aj: optical observations
  88. GRB 060218/SN 2006aj, LNA optical observation
  89. GRB 060319: IAC-80 optical observations
  90. GRB 060319: Re-analysis of TNG data
  91. GRB 060319 optical observations at TNG
  92. GRB060319 : Liverpool Telescope optical limit
  93. GRB060319: MASTER optical observation
  94. GRB060313: Radio Observations
  95. GRB 060313: early afterglow NIR upper limits with REM
  96. GRB 060313: Swift-XRT team refined analysis
  97. GRB060313: optical observations of the afterglow candidate
  98. GRB 060313, SMARTS optical counterpart?
  99. GRB 060313: Possible optical counterpart
  100. GRB 060313, SMARTS optical/IR observations

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