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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"

36214 results found.

  1. GRB 050412: Subaru observations
  2. GRB 050408: RTT150 optical observations
  3. GRB 050412: PROMPT VRcIc Observations
  4. GRB 050408: Kuiper 1.5m observations
  5. GRB 050412: optical limit
  6. GRB 050412: optical observations
  7. GRB 050408: refined XRT analysis, no jet break seen yet
  8. GRB 050412: early Swift XRT analysis results
  9. GRB 050412 : XingLong optical observation
  10. GRB 050412: Swift-BAT refined analysis
  11. GRB 050412: ANU 2.3m observations
  12. GRB 050412: Early Optical/Ultraviolet Observations with
  13. GRB 050412: retraction of UVOT transient report
  14. GRB 050412: UVOT transient not in XRT error circle
  15. GRB 050408: SDSS Field Calibration
  16. GRB 050412: Optical limit
  17. GRB 050412: LCO Optical Observations
  18. GRB 050412: Optical observations
  19. GRB050412: P60 Observations
  20. GRB 050412: Swift XRT Position
  21. GRB050412: optical limit before and during GRB
  22. GRB 050412: LCO optical observations
  23. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  24. GRB 050412: IR and Optical observations
  25. GRB 050412: IR Observations
  26. GRB050408: Radio Observations
  27. GRB 050401: Optical limit
  28. GRB 050408: Optical limit
  29. GRB050410: P60 Observations
  30. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  31. GRB 050410, optical observations
  32. GRB 050408: PROMPT VRcIc Observations
  33. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  34. GRB 050410 R band Optical Observations
  35. GRB050410 : Null detection report
  36. GRB 050410, optical observations
  37. GRB050410: Radio Observations
  38. GRB 050408: Swift XRT measurement of possible jet break
  39. GRB050410: MASTER optical observations
  40. GRB 050410: Early observations with Swift-UVOT
  41. Swift-BAT detection of GRB 050410
  42. GRB 050410: Swift XRT Position
  43. GRB 050408: Retraction of Proposed Host Galaxy
  44. GRB 050408: Inconsistency of host galaxy identification
  45. GRB 050408: Subaru Observations
  46. GRB 050408: WIDGET simultaneous optical observations
  47. GRB 050408: SOAR UBVRc Observations
  48. GRB 050408: Properties of the Host Galaxy
  49. GRB 050408: Mercator Optical Observations
  50. GRB050408: Radio Observations
  51. GRB 050408: Swift XRT analysis
  52. GRB 050408, SMARTS optical/IR afterglow observations
  53. GRB 050408: Optical limit at 20 min after the burst
  54. GRB 050408, optical observations
  55. GRB 050408: Moderate-resolution Gemini Spectroscopy
  56. GRB 050408,optical observation
  57. GRB 050408 Optical Observations
  58. GRB 050408: Emission and absorption redshift
  59. GRB 050408: Mercator Optical Observations
  60. GRB 050408: Magellan astrometry and photometry
  61. GRB 050408: First Optical observations with TFOSC at the RTT150
  62. GRB 050408: steepening of the optical decay
  63. GRB 050408: Optical afterglow confirmed
  64. GRB 050408: opitcal observation
  65. GRB 050408, optical observations
  66. GRB 050408 optical candidate
  67. GRB 050408: Swift XRT Position
  68. GRB 050408: ROTSE-III Optical Limits
  69. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  70. GRB050408: MASTER optical observations
  71. GRB050401: Radio Detection
  72. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  73. GRB 050406: Magellan optical observations
  74. GRB 050406: early Swift XRT analysis results
  75. GRB 050406 BAT refined analysis
  76. GRB 050406: Early observations with Swift-UVOT
  77. GRB 050406: Swift XRT Position
  78. Swift-BAT detection of GRB 050406
  79. Konus-Wind observation of GRB 050401
  80. GRB050401: Radio observation at 610 MHz with GMRT
  81. GRB 050401: VLT spectroscopic redshift
  82. GRB 050401 Optical Observations
  83. GRB 050401 BAT refined analysis
  84. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  85. GRB050401: TNG R-band observation
  86. GRB 050402A: IR Analysis
  87. GRB 050402A: IR Observations
  88. GRB 050402: Early observations with Swift-UVOT
  89. Swift Trigger 113225: P60 Observations
  90. GRB 050401: Optical afterglow confirmed
  91. GRB 050401: Optical afterglow candidate
  92. Swift-BAT detection of GRB 050401
  93. GRB 050401: Prompt XRT position
  94. Retraction of three Swift GRB triggers
  95. GRB050331: No Afterglow Detected
  96. Swift-BAT detection of GRB 050331b
  97. GRB 050331: Swift UVOT Source
  98. Swift-BAT detection of GRB 050331
  99. GRB 050331: Swift XRT Position
  100. GRB050319: radio observation

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