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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"

37729 results found.

  1. GRB050401: Radio observation at 610 MHz with GMRT
  2. GRB 050401: VLT spectroscopic redshift
  3. GRB 050401 Optical Observations
  4. GRB 050401 BAT refined analysis
  5. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  6. GRB050401: TNG R-band observation
  7. GRB 050402A: IR Analysis
  8. GRB 050402A: IR Observations
  9. GRB 050402: Early observations with Swift-UVOT
  10. Swift Trigger 113225: P60 Observations
  11. GRB 050401: Optical afterglow confirmed
  12. GRB 050401: Optical afterglow candidate
  13. Swift-BAT detection of GRB 050401
  14. GRB 050401: Prompt XRT position
  15. Retraction of three Swift GRB triggers
  16. GRB050331: No Afterglow Detected
  17. Swift-BAT detection of GRB 050331b
  18. GRB 050331: Swift UVOT Source
  19. Swift-BAT detection of GRB 050331
  20. GRB 050331: Swift XRT Position
  21. GRB050319: radio observation
  22. Konus-Wind observation of GRB 050326
  23. GRB 050326: Early observations with Swift-UVOT
  24. GRB 050326 XMM-Newton observation
  25. GRB 050326 : Planned XMM-Newton observation
  26. GRB 050326: Swift XRT Position
  27. GRB050326: optical limit 33min before GRB
  28. GRB 050326 BAT refined analysis
  29. GRB050326: delayed XRT observation
  30. Swift-BAT detection of a bright GRB 050326
  31. GRB050319, color indices
  32. GRB050319: RTT150 Optical Observations
  33. Swift-BAT trigger 112060 is not a real GRB
  34. GRB 050319: Absorption redshift from the Nordic Optical Telescope
  35. GRB 050319: ROTSE-III Refined Analysis
  36. GRB 050318: Swift-BAT refined analysis
  37. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  38. GRB050319: VLA Observations
  39. GRB 050319 R band observations
  40. GRB 050319: Swift-UVOT detection of the afterglow
  41. GRB 050315: Variability Analysis of Swift BAT Time History
  42. GRB050319: Radio Observations
  43. GRB 050319: NIR afterglow candidate
  44. GRB 050319:Near IR afterglow
  45. GRB 050318: SWIFT-UVOT refined analysis
  46. GRB 050318: Absorption redshift from Magellan
  47. GRB 050319: Optical observation
  48. GRB 050319 : Confirmation of optical afterglow decay
  49. GRB 050319: Swift-BAT refined analysis
  50. GRB050319,optical observation
  51. Swift Detection of GRB 050319
  52. GRB 050319: Detection of Possible Optical Counterpart
  53. GRB 050318: Swift/UVOT detection of afterglow emission
  54. GRB 050318: Magellan optical afterglow identification
  55. GRB050318: Swift XRT position
  56. RXTE Observations of GRB050318
  57. Swift-BAT detection of GRB 050318
  58. GRB 050315, SMARTS optical afterglow decay
  59. GRB050316: MASTER before, simultanious and follow up optical
  60. GRB 050306: ROTSE-III early limits
  61. GRB050316: MASTER optical observations
  62. GRB 050315: Swift-BAT further refined analysis
  63. GRB 050315, SMARTS optical/IR afterglow observations
  64. GRB 050315 I-band observations
  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 050219b: Gemini/GNIRS near-infrared spectroscopy
  72. GRB 050315: Early Observations with Swift/UVOT
  73. Swift-BAT detection of GRB 050315
  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 050309, Early optical limits from RAPTOR
  82. GRB 050306: further TAROT optical data
  83. GRB050309: Early optical limit from P60
  84. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  85. GRB 050309 : Lulin R-band observation
  86. Swift 107873: P60 Optical Observations
  87. GRB 050306: CORRECTION to date of observation
  88. GRB 050306: R-band observations
  89. GRB 050306: No Swift UVOT Optical Counterpart Detected
  90. GRB 050306: REM optical-infrared observations
  91. GRB 050306: Possible X-ray Afterglow Position from the Swift
  92. Swift trigger 107518: optical observation
  93. GRB 050306: TAROT optical observations
  94. GRB 050306,optical observation
  95. GRB 050306: Swift-BAT detection of a long burst
  96. GRB 050126: Confirmation of the NIR afterglow candidate
  97. PROMPT VRcIc Observations of GRB 050223
  98. XRF/GRB 050215B: Radio Observations
  99. XMM-Newton Images of GRB 050223
  100. GRB 050219b: candidate NIR afterglow

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