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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27774 results found.

  1. GRB 050408: PROMPT VRcIc Observations
  2. GRB 050408: Early Optical/Ultraviolet Observations with Swift/UVOT
  3. GRB 050410 R band Optical Observations
  4. GRB050410 : Null detection report
  5. GRB 050410, optical observations
  6. GRB050410: Radio Observations
  7. GRB 050408: Swift XRT measurement of possible jet break
  8. GRB050410: MASTER optical observations
  9. GRB 050410: Early observations with Swift-UVOT
  10. Swift-BAT detection of GRB 050410
  11. GRB 050410: Swift XRT Position
  12. GRB 050408: Properties of the Host Galaxy
  13. GRB 050408: Mercator Optical Observations
  14. GRB 050408: Swift XRT analysis
  15. GRB 050408, optical observations
  16. GRB050408: REM NIR and Optical observation
  17. GRB 050408 Optical Observations
  18. GRB 050408: Optical afterglow confirmed
  19. GRB 050408, optical observations
  20. GRB 050408 optical candidate
  21. GRB 050408: Swift XRT Position
  22. GRB050401: Radio Detection
  23. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  24. GRB 050406: Magellan optical observations
  25. GRB 050406: early Swift XRT analysis results
  26. GRB 050406 BAT refined analysis
  27. GRB 050406: Early observations with Swift-UVOT
  28. GRB 050406: Swift XRT Position
  29. Swift-BAT detection of GRB 050406
  30. Konus-Wind observation of GRB 050401
  31. GRB050401: Radio observation at 610 MHz with GMRT
  32. GRB 050401: VLT spectroscopic redshift
  33. GRB 050401 Optical Observations
  34. GRB050401: Maidanak optical observation
  35. GRB 050401 BAT refined analysis
  36. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  37. GRB 050402A: IR Analysis
  38. GRB 050402A: IR Observations
  39. GRB 050402: Early observations with Swift-UVOT
  40. Swift Trigger 113225: P60 Observations
  41. GRB050401: ROTSE-III Detection of Prompt Optical Counterpart
  42. GRB 050401: Optical afterglow candidate
  43. Swift-BAT detection of GRB 050401
  44. GRB 050401: Prompt XRT position
  45. Retraction of three Swift GRB triggers
  46. Swift-BAT detection of GRB 050331b
  47. GRB 050331: Swift UVOT Source
  48. Swift-BAT detection of GRB 050331
  49. GRB 050331: Swift XRT Position
  50. Swift Data Publicly Available Starting April 5, 2005
  51. Konus-Wind observation of GRB 050326
  52. GRB050326: optical limit
  53. GRB 050326: Early observations with Swift-UVOT
  54. GRB 050326 XMM-Newton observation
  55. GRB 050326 : Planned XMM-Newton observation
  56. GRB 050326: Swift XRT Position
  57. GRB050326: optical limit 33min before GRB
  58. GRB 050326 BAT refined analysis
  59. GRB050326: delayed XRT observation
  60. Swift-BAT detection of a bright GRB 050326
  61. GRB050319, optical observations
  62. GRB050319, color indices
  63. GRB050319: RTT150 Optical Observations
  64. Swift-BAT detection of a bright outburst from SGR1806-20
  65. Swift-BAT trigger 112060 is not a real GRB
  66. GRB 050319: ROTSE-III Refined Analysis
  67. GRB 050318: Swift-BAT refined analysis
  68. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  69. GRB 050319 R band observations
  70. GRB 050319: Swift-UVOT detection of the afterglow
  71. GRB 050315: Variability Analysis of Swift BAT Time History
  72. GRB 050319: NIR afterglow candidate
  73. GRB 050319:Near IR afterglow
  74. GRB050319: BR optical photometry
  75. GRB 050318: SWIFT-UVOT refined analysis
  76. GRB 050319: Swift-BAT refined analysis
  77. GRB050319,optical observation
  78. Swift Detection of GRB 050319
  79. GRB 050319: Detection of Possible Optical Counterpart
  80. GRB 050318: Swift/UVOT detection of afterglow emission
  81. GRB050318: Swift XRT position
  82. Swift-BAT detection of GRB 050318
  83. GRB 050315, SMARTS optical afterglow decay
  84. GRB050223: analysis of the XMM-Newton observation
  85. GRB 050306: ROTSE-III early limits
  86. GRB 050315: Swift-BAT further refined analysis
  87. GRB 050315, SMARTS optical/IR afterglow observations
  88. GRB050315: Swift-BAT Refined analysis
  89. Non-detection of GRB050315 in ATCA Radio Observations
  90. GRB 050315: Swift XRT Position
  91. GRB 050315: Early Observations with Swift/UVOT
  92. Swift-BAT detection of GRB 050315
  93. GRB050223: No XMM-Newton OM detection of afterglow emission
  94. GRB 050306: Radio Observations
  95. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  96. GRB050309: CONCAM pre-trigger and trigger coincident optical
  97. GRB 050126: Redshift determination
  98. Swift-BAT trigger 107873: No Swift XRT counterpart
  99. GRB 050306: Confirmation of X-ray afterglow
  100. GRB 050309, Early optical limits from RAPTOR

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