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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"

18380 results found.

  1. GRB 051227 : WIDGET simultaneous optical observations
  2. GRB 051028 : WIDGET pre-trigger limit
  3. GRB060526: Optical counterpart from MIRO
  4. GRB 060526: RTT150 optical observations
  5. GRB060526: optical observations
  6. GRB 060526: REM observations
  7. GRB 060526: RTT150 optical observations, afterglow flattening
  8. GRB 060526: RTT150 optical observations
  9. GRB060526, optical observations
  10. GRB 060526: Swift/XRT Team refined analysis
  11. GRB 060526: Watcher Observations
  12. GRB060526 - SDSS Pre-burst Observations
  13. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  14. GRB 060413 : WIDGET simultaneous optical observations
  15. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  16. XMM-Newton observation of GRB060510b
  17. GRB060512: Late-Time P200 Observations
  18. GRB 060522: REM NIR observations
  19. GRB 060522: TNG optical observations
  20. GRB 060515: NIR observation
  21. GRB060515: P200 NIR Observations
  22. GRB 060515 BAT refined analysis
  23. GRB 060512: TAROT optical observation
  24. GRB 060515: Swift/UVOT Upper Limits
  25. GRB 060515: Swift/XRT position
  26. GRB 060515: Super-LOTIS Observations
  27. GRB 060515: TAROT optical observation
  28. GRB 060512: Subaru NIR observation
  29. GRB 060512: 1.54m Kuiper Observations
  30. GRB 060512: Detection of NIR afterglow
  31. GRB 060512: P60 Observations
  32. GRB 060512: REM NIR observations
  33. GRB060512 - SDSS Pre-Burst Observations
  34. GRB 060512: Swift detection of a burst with an optical afterglow
  35. GRB 060505: X-ray afterglow - Correction -
  36. GRB 060505: X-ray afterglow
  37. GRB060418: optical observations
  38. GRB060510B: Swift XRT refined analysis
  39. GRB 060510A: Refined analysis of the Swift-BAT burst
  40. GRB060510 - SDSS Pre-Burst Observations
  41. GRB 060510B: Swift detection of a burst
  42. GRB 060510: Swift detection of a burst with optical transient
  43. GRB060507: optical afterglow detection
  44. GRB060502B: improvement in the XRT afterglow position
  45. GRB 060505: PROMPT Observations
  46. GRB060505: Swift/UVOT Observations
  47. GRB060425: new MASTER survey method
  48. GRB 060505: Swift XRT afterglow canditate position
  49. GRB 060502b: Second epoch Gemini observations
  50. GRB 060428B: spectroscopy
  51. GRB 060502B: optical observations
  52. GRB 060502B: AROMA refined photometric calibration
  53. GRB 060502B MDM Follow-up Observation
  54. GRB 060502b: Gemini imaging and spectroscopy
  55. GRB060502A, optical observation
  56. GRB 060502B: Swift/UVOT upper limits
  57. GRB 060502A: Swift/UVOT source detection
  58. GRB 060501: P60 Observations and Candidate Retraction
  59. GRB 060502B: Xinglong optical observation
  60. GRB060501: Swift UVOT followup observations
  61. GRB 060502: P60 Afterglow Confirmation
  62. GRB 060502: Swift detection of a burst with an optical counterpart
  63. GRB060501: P60 imaging and afterglow candidate
  64. GRB060428B - SDSS Pre-Burst Observations
  65. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  66. GRB 060427B: IPN localization of a short hard burst
  67. GRB 060428B: Xinglong I-band limit
  68. GRB 051117A: Bright host galaxy not confirmed
  69. GRB060428A: Swift/UVOT observations.
  70. GRB060428B, optical observation
  71. GRB 060428b : Kiso R-band limit
  72. GRB 060428b: Optical afterglow candidate
  73. GRB060428A: Swift XRT Team refined analysis
  74. GRB 060428B: Swift detection of a burst
  75. GRB 060427: NIR observations
  76. GRB060427: Xinglong optical Observations
  77. GRB 060428: Swift detection of a burst
  78. GRB 060427: Swift/UVOT upper limits.
  79. GRB060427: Swift XRT Team refined analysis
  80. GRB060418: Swift XRT Team Further Refined Analysis
  81. GRB 060427, optical observation
  82. GRB 060427: Swift detection of a burst
  83. GRB 060424: Refined analysis of the Swift-BAT burst
  84. GRB060421: Swift/UVOT observations
  85. GRB(?) 060421: Swift detection of a burst
  86. GRB 060418: Radio Observations
  87. GRB060418, BVRcIc field calibration
  88. GRB060418: Swift/UVOT Observations
  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. GRB060413: Swift/UVOT upper limits
  93. GRB 060413: REM NIR Observations
  94. GRB 060403: MITSuME optical observation
  95. GRB060403: Optical Limit
  96. GRB 060403: Swift/UVOT upper limits
  97. SGR 1900+14: BAT observations
  98. GRB 060403: Swift detection of a burst
  99. HETE trigger H4044: RTT150 optical observations
  100. GRB060331: Swift/UVOT upper limits

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