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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"

23707 results found.

  1. GRB050408: Radio Observations
  2. GRB 050408: Swift XRT analysis
  3. GRB050408: REM NIR and Optical observation
  4. GRB 050408: Emission and absorption redshift
  5. GRB 050408: First Optical observations with TFOSC at the RTT150
  6. GRB 050408: steepening of the optical decay
  7. GRB 050408 optical candidate
  8. GRB 050408: Swift XRT Position
  9. GRB 050408 (=H3711): A Long X-Ray-Rich GRB Detected by HETE
  10. GRB050408: MASTER optical observations
  11. GRB050401: Radio Detection
  12. Swift-UVOT Optical Counterpart Candidate to XRF 050406
  13. GRB 050406: early Swift XRT analysis results
  14. GRB 050406 BAT refined analysis
  15. GRB 050406: Early observations with Swift-UVOT
  16. GRB 050406: Swift XRT Position
  17. Swift-BAT detection of GRB 050406
  18. Konus-Wind observation of GRB 050401
  19. GRB050401, radio observation at 4.8 GHz and 8.64 GHz
  20. GRB 050401 Optical Observations
  21. GRB050401: Maidanak optical observation
  22. GRB 050401 BAT refined analysis
  23. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  24. GRB050401: TNG R-band observation
  25. GRB 050402: Early observations with Swift-UVOT
  26. Swift-BAT detection of GRB 050401
  27. GRB 050401: Prompt XRT position
  28. Swift-BAT detection of GRB 050331b
  29. GRB 050331: Swift UVOT Source
  30. Swift-BAT detection of GRB 050331
  31. GRB 050331: Swift XRT Position
  32. GRB050319: radio observation
  33. Konus-Wind observation of GRB 050326
  34. GRB050326: optical limit
  35. GRB 050326: Early observations with Swift-UVOT
  36. GRB 050326 XMM-Newton observation
  37. GRB 050326: Swift XRT Position
  38. GRB 050326 BAT refined analysis
  39. GRB050326: delayed XRT observation
  40. Swift-BAT detection of a bright GRB 050326
  41. GRB050319: optical observation, March 20-22
  42. GRB050319: RTT150 Optical Observations
  43. Swift-BAT detection of a bright outburst from SGR1806-20
  44. GRB 050319: ROTSE-III Refined Analysis
  45. GRB 050318: Swift-BAT refined analysis
  46. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  47. GRB050319: VLA Observations
  48. GRB 050319 R band observations
  49. GRB 050319: Swift-UVOT detection of the afterglow
  50. GRB050319: Radio Observations
  51. GRB050319: BR optical photometry
  52. GRB 050318: SWIFT-UVOT refined analysis
  53. GRB 050319 : Confirmation of optical afterglow decay
  54. GRB 050319: Swift-BAT refined analysis
  55. Swift Detection of GRB 050319
  56. GRB 050318: Swift/UVOT detection of afterglow emission
  57. GRB 050318: Magellan optical afterglow identification
  58. GRB050318: Swift XRT position
  59. RXTE Observations of GRB050318
  60. Swift-BAT detection of GRB 050318
  61. GRB050316: MASTER before, simultanious and follow up optical
  62. GRB 050306: ROTSE-III early limits
  63. GRB050316: MASTER optical observations
  64. GRB 050315: Swift-BAT further refined analysis
  65. GRB050315: Radio afterglow
  66. GRB 050315: Absorption redshift
  67. GRB 050315: Optical afterglow identification
  68. GRB050315: Swift-BAT Refined analysis
  69. Non-detection of GRB050315 in ATCA Radio Observations
  70. GRB 050315: Swift XRT Position
  71. GRB 050315: Early Observations with Swift/UVOT
  72. Swift-BAT detection of GRB 050315
  73. GRB050223: No XMM-Newton OM detection of afterglow emission
  74. GRB 050306: Radio Observations
  75. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  76. GRB050309: CONCAM pre-trigger and trigger coincident optical
  77. GRB 050306: optical afterglow
  78. GRB 050126: Redshift determination
  79. Swift-BAT trigger 107873: No Swift XRT counterpart
  80. GRB 050306: Confirmation of X-ray afterglow
  81. GRB 050306: further TAROT optical data
  82. GRB050309: Early optical limit from P60
  83. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  84. GRB 050309 : Lulin R-band observation
  85. GRB 050306: CORRECTION to date of observation
  86. GRB 050306: R-band observations
  87. GRB 050306: No Swift UVOT Optical Counterpart Detected
  88. GRB 050306: REM optical-infrared observations
  89. GRB 050306: Possible X-ray Afterglow Position from the Swift
  90. Swift trigger 107518: optical observation
  91. GRB 050306: TAROT optical observations
  92. GRB 050306: Swift-BAT detection of a long burst
  93. Ongoing activity of SGR 1806-20 after the giant flare
  94. GRB050215B: Late-Time Swift UVOT Observations
  95. PROMPT VRcIc Observations of GRB 050223
  96. XRF/GRB 050215B: Radio Observations
  97. GRB 050219b: candidate NIR afterglow
  98. Confirmed XRF nature for GRB050215b
  99. GRB 050223: optical observations
  100. GRB050223 XMM-Newton observation

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