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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"

36241 results found.

  1. GRB 050401 Optical Observations
  2. GRB 050401 BAT refined analysis
  3. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  4. GRB050401: TNG R-band observation
  5. GRB 050402A: IR Analysis
  6. GRB 050402A: IR Observations
  7. GRB 050402: Early observations with Swift-UVOT
  8. Swift Trigger 113225: P60 Observations
  9. GRB 050401: Optical afterglow confirmed
  10. GRB 050401: Optical afterglow candidate
  11. Swift-BAT detection of GRB 050401
  12. GRB 050401: Prompt XRT position
  13. Retraction of three Swift GRB triggers
  14. GRB050331: No Afterglow Detected
  15. Swift-BAT detection of GRB 050331b
  16. GRB 050331: Swift UVOT Source
  17. Swift-BAT detection of GRB 050331
  18. GRB 050331: Swift XRT Position
  19. GRB050319: radio observation
  20. Konus-Wind observation of GRB 050326
  21. GRB 050326: Early observations with Swift-UVOT
  22. GRB 050326 XMM-Newton observation
  23. GRB 050326 : Planned XMM-Newton observation
  24. GRB 050326: Swift XRT Position
  25. GRB050326: optical limit 33min before GRB
  26. GRB 050326 BAT refined analysis
  27. GRB050326: delayed XRT observation
  28. Swift-BAT detection of a bright GRB 050326
  29. GRB050319, color indices
  30. GRB050319: RTT150 Optical Observations
  31. Swift-BAT trigger 112060 is not a real GRB
  32. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  33. GRB 050319: ROTSE-III Refined Analysis
  34. GRB 050318: Swift-BAT refined analysis
  35. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  36. GRB050319: VLA Observations
  37. GRB 050319 R band observations
  38. GRB 050319: Swift-UVOT detection of the afterglow
  39. GRB 050315: Variability Analysis of Swift BAT Time History
  40. GRB050319: Radio Observations
  41. GRB 050319: NIR afterglow candidate
  42. GRB 050319:Near IR afterglow
  43. GRB 050318: SWIFT-UVOT refined analysis
  44. GRB 050318: Absorption redshift from Magellan
  45. GRB 050319: Optical observation
  46. GRB 050319 : Confirmation of optical afterglow decay
  47. GRB 050319: Swift-BAT refined analysis
  48. GRB050319,optical observation
  49. Swift Detection of GRB 050319
  50. GRB 050319: Detection of Possible Optical Counterpart
  51. GRB 050318: Swift/UVOT detection of afterglow emission
  52. GRB 050318: Magellan optical afterglow identification
  53. GRB050318: Swift XRT position
  54. RXTE Observations of GRB050318
  55. Swift-BAT detection of GRB 050318
  56. GRB 050315, SMARTS optical afterglow decay
  57. GRB050316: MASTER before, simultanious and follow up optical
  58. GRB 050306: ROTSE-III early limits
  59. GRB050316: MASTER optical observations
  60. GRB 050315: Swift-BAT further refined analysis
  61. GRB 050315, SMARTS optical/IR afterglow observations
  62. GRB 050315 I-band observations
  63. GRB050315: Radio afterglow
  64. GRB 050315: Absorption redshift
  65. GRB 050315: Optical afterglow identification
  66. GRB050315: Swift-BAT Refined analysis
  67. Non-detection of GRB050315 in ATCA Radio Observations
  68. GRB 050315: Swift XRT Position
  69. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  70. GRB 050315: Early Observations with Swift/UVOT
  71. Swift-BAT detection of GRB 050315
  72. GRB 050306: Radio Observations
  73. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  74. GRB050309: CONCAM pre-trigger and trigger coincident optical
  75. GRB 050306: optical afterglow
  76. GRB 050126: Redshift determination
  77. Swift-BAT trigger 107873: No Swift XRT counterpart
  78. GRB 050306: Confirmation of X-ray afterglow
  79. GRB 050309, Early optical limits from RAPTOR
  80. GRB 050306: further TAROT optical data
  81. GRB050309: Early optical limit from P60
  82. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  83. GRB 050309 : Lulin R-band observation
  84. Swift 107873: P60 Optical Observations
  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,optical observation
  93. GRB 050306: Swift-BAT detection of a long burst
  94. GRB 050126: Confirmation of the NIR afterglow candidate
  95. PROMPT VRcIc Observations of GRB 050223
  96. XRF/GRB 050215B: Radio Observations
  97. XMM-Newton Images of GRB 050223
  98. GRB 050219b: candidate NIR afterglow
  99. IBAS GRB Alert #2321
  100. GRB 050223: optical observations

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