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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"

37198 results found.

  1. GRB 050412: retraction of UVOT transient report
  2. GRB 050412: UVOT transient not in XRT error circle
  3. GRB 050408: SDSS Field Calibration
  4. GRB 050412: Optical limit
  5. GRB 050412: LCO Optical Observations
  6. GRB 050412: Optical observations
  7. GRB050412: P60 Observations
  8. GRB 050412: Swift XRT Position
  9. GRB050412: optical limit before and during GRB
  10. GRB 050412: LCO optical observations
  11. GRB050412: ROTSE-III Optical Limits
  12. Swift-BAT Detection of GRB 050412: A Bright, Long Burst
  13. GRB 050412: IR and Optical observations
  14. GRB 050412: IR Observations
  15. GRB050408: Radio Observations
  16. GRB 050401: Optical limit
  17. GRB 050408: Optical limit
  18. GRB050410: P60 Observations
  19. GRB 050410: Early Optical/Ultraviolet Observations with Swift/UVOT
  20. GRB 050410, optical observations
  21. GRB 050408: PROMPT VRcIc Observations
  22. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  23. GRB 050410 R band Optical Observations
  24. GRB050410 : Null detection report
  25. GRB 050410, optical observations
  26. GRB050410: Radio Observations
  27. GRB 050408: Swift XRT measurement of possible jet break
  28. GRB050410: MASTER optical observations
  29. GRB 050410: Early observations with Swift-UVOT
  30. Swift-BAT detection of GRB 050410
  31. GRB 050410: Swift XRT Position
  32. GRB 050408: Retraction of Proposed Host Galaxy
  33. GRB 050408: Inconsistency of host galaxy identification
  34. GRB 050408: Subaru Observations
  35. GRB 050408: WIDGET simultaneous optical observations
  36. GRB 050408: SOAR UBVRc Observations
  37. GRB 050408: Properties of the Host Galaxy
  38. GRB 050408: Mercator Optical Observations
  39. GRB050408: Radio Observations
  40. GRB 050408: Swift XRT analysis
  41. GRB 050408, SMARTS optical/IR afterglow observations
  42. GRB 050408: Optical limit at 20 min after the burst
  43. GRB 050408, optical observations
  44. GRB 050408: Moderate-resolution Gemini Spectroscopy
  45. GRB 050408,optical observation
  46. GRB 050408 Optical Observations
  47. GRB 050408: Emission and absorption redshift
  48. GRB 050408: Mercator Optical Observations
  49. GRB 050408: Magellan astrometry and photometry
  50. GRB 050408: First Optical observations with TFOSC at the RTT150
  51. GRB 050408: steepening of the optical decay
  52. GRB 050408: Optical afterglow confirmed
  53. GRB 050408: opitcal observation
  54. GRB 050408, optical observations
  55. GRB 050408 optical candidate
  56. GRB 050408: Swift XRT Position
  57. GRB 050408: ROTSE-III Optical Limits
  58. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  59. GRB050408: MASTER optical observations
  60. GRB050401: Radio Detection
  61. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  62. GRB 050406: Magellan optical observations
  63. GRB 050406: early Swift XRT analysis results
  64. GRB 050406 BAT refined analysis
  65. GRB 050406: Early observations with Swift-UVOT
  66. GRB 050406: Swift XRT Position
  67. Swift-BAT detection of GRB 050406
  68. Konus-Wind observation of GRB 050401
  69. GRB050401: Radio observation at 610 MHz with GMRT
  70. GRB 050401: VLT spectroscopic redshift
  71. GRB 050401 Optical Observations
  72. GRB 050401 BAT refined analysis
  73. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  74. GRB050401: TNG R-band observation
  75. GRB 050402A: IR Analysis
  76. GRB 050402A: IR Observations
  77. GRB 050402: Early observations with Swift-UVOT
  78. Swift Trigger 113225: P60 Observations
  79. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  80. GRB 050401: Optical afterglow confirmed
  81. GRB 050401: Optical afterglow candidate
  82. Swift-BAT detection of GRB 050401
  83. GRB 050401: Prompt XRT position
  84. Retraction of three Swift GRB triggers
  85. GRB050331: No Afterglow Detected
  86. Swift-BAT detection of GRB 050331b
  87. GRB 050331: Swift UVOT Source
  88. Swift-BAT detection of GRB 050331
  89. GRB 050331: Swift XRT Position
  90. GRB050319: radio observation
  91. Konus-Wind observation of GRB 050326
  92. GRB 050326: Early observations with Swift-UVOT
  93. GRB 050326 XMM-Newton observation
  94. GRB 050326 : Planned XMM-Newton observation
  95. GRB 050326: Swift XRT Position
  96. GRB050326: optical limit 33min before GRB
  97. GRB 050326 BAT refined analysis
  98. GRB050326: delayed XRT observation
  99. Swift-BAT detection of a bright GRB 050326
  100. GRB050319, color indices

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