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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"

23687 results found.

  1. GRB050401: Maidanak optical observation
  2. GRB 050401 BAT refined analysis
  3. Very questionable identity of Swift-BAT GRB050402 (Trig=113225)
  4. GRB050401: TNG R-band observation
  5. GRB 050402: Early observations with Swift-UVOT
  6. Swift-BAT detection of GRB 050401
  7. GRB 050401: Prompt XRT position
  8. Swift-BAT detection of GRB 050331b
  9. GRB 050331: Swift UVOT Source
  10. Swift-BAT detection of GRB 050331
  11. GRB 050331: Swift XRT Position
  12. GRB050319: radio observation
  13. Konus-Wind observation of GRB 050326
  14. GRB050326: optical limit
  15. GRB 050326: Early observations with Swift-UVOT
  16. GRB 050326 XMM-Newton observation
  17. GRB 050326: Swift XRT Position
  18. GRB 050326 BAT refined analysis
  19. GRB050326: delayed XRT observation
  20. Swift-BAT detection of a bright GRB 050326
  21. GRB050319: optical observation, March 20-22
  22. GRB050319: RTT150 Optical Observations
  23. Swift-BAT detection of a bright outburst from SGR1806-20
  24. GRB 050319: ROTSE-III Refined Analysis
  25. GRB 050318: Swift-BAT refined analysis
  26. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  27. GRB050319: VLA Observations
  28. GRB 050319 R band observations
  29. GRB 050319: Swift-UVOT detection of the afterglow
  30. GRB050319: Radio Observations
  31. GRB050319: BR optical photometry
  32. GRB 050318: SWIFT-UVOT refined analysis
  33. GRB 050319 : Confirmation of optical afterglow decay
  34. GRB 050319: Swift-BAT refined analysis
  35. Swift Detection of GRB 050319
  36. GRB 050318: Swift/UVOT detection of afterglow emission
  37. GRB 050318: Magellan optical afterglow identification
  38. GRB050318: Swift XRT position
  39. RXTE Observations of GRB050318
  40. Swift-BAT detection of GRB 050318
  41. GRB050316: MASTER before, simultanious and follow up optical
  42. GRB 050306: ROTSE-III early limits
  43. GRB050316: MASTER optical observations
  44. GRB 050315: Swift-BAT further refined analysis
  45. GRB050315: Radio afterglow
  46. GRB 050315: Absorption redshift
  47. GRB 050315: Optical afterglow identification
  48. GRB050315: Swift-BAT Refined analysis
  49. Non-detection of GRB050315 in ATCA Radio Observations
  50. GRB 050315: Swift XRT Position
  51. GRB 050315: Early Observations with Swift/UVOT
  52. Swift-BAT detection of GRB 050315
  53. GRB050223: No XMM-Newton OM detection of afterglow emission
  54. GRB 050306: Radio Observations
  55. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  56. GRB050309: CONCAM pre-trigger and trigger coincident optical
  57. GRB 050306: optical afterglow
  58. GRB 050126: Redshift determination
  59. Swift-BAT trigger 107873: No Swift XRT counterpart
  60. GRB 050306: Confirmation of X-ray afterglow
  61. GRB 050306: further TAROT optical data
  62. GRB050309: Early optical limit from P60
  63. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  64. GRB 050309 : Lulin R-band observation
  65. GRB 050306: CORRECTION to date of observation
  66. GRB 050306: R-band observations
  67. GRB 050306: No Swift UVOT Optical Counterpart Detected
  68. GRB 050306: REM optical-infrared observations
  69. GRB 050306: Possible X-ray Afterglow Position from the Swift
  70. Swift trigger 107518: optical observation
  71. GRB 050306: TAROT optical observations
  72. GRB 050306: Swift-BAT detection of a long burst
  73. Ongoing activity of SGR 1806-20 after the giant flare
  74. GRB050215B: Late-Time Swift UVOT Observations
  75. PROMPT VRcIc Observations of GRB 050223
  76. XRF/GRB 050215B: Radio Observations
  77. GRB 050219b: candidate NIR afterglow
  78. Confirmed XRF nature for GRB050215b
  79. GRB 050223: optical observations
  80. GRB050223 XMM-Newton observation
  81. INTEGRAL detection of GRB 050223
  82. GRB050223: No Swift UVOT Detection of Afterglow Emission
  83. GRB 050223 Swift/BAT detection of a burst
  84. GRB 050223: Swift XRT Position
  85. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  86. GRB050219b: CORRECTION to time of UVOT observations
  87. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  88. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  89. GRB 050219b: Optical and near-IR observations from LCO
  90. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  91. GRB 050219b: Swift-BAT detection of a burst
  92. GRB 050219a, optical observations
  93. GRB 050219a: Refined XRT position
  94. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  95. GRB 050219: Swift-BAT detection of a burst
  96. GRB050215b: Swift UVOT Detection of Afterglow Emission
  97. GRB 050219: Prompt X-ray position
  98. GRB 050215B: Radio Observations
  99. GRB 050215b: XRT confirmation of IR afterglow candidate
  100. GRB050215b: P60 Optical Observations

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