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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"

21456 results found.

  1. Swift Detection of GRB 050319
  2. GRB 050319: Detection of Possible Optical Counterpart
  3. GRB 050318: Swift/UVOT detection of afterglow emission
  4. GRB 050318: Magellan optical afterglow identification
  5. GRB050318: Swift XRT position
  6. Swift-BAT detection of GRB 050318
  7. GRB050223: analysis of the XMM-Newton observation
  8. GRB 050306: ROTSE-III early limits
  9. GRB 050315: Swift-BAT further refined analysis
  10. GRB050315: Radio afterglow
  11. GRB 050315: Optical afterglow identification
  12. GRB050315: Swift-BAT Refined analysis
  13. Non-detection of GRB050315 in ATCA Radio Observations
  14. GRB 050315: Swift XRT Position
  15. GRB 050315: Early Observations with Swift/UVOT
  16. Swift-BAT detection of GRB 050315
  17. GRB050223: No XMM-Newton OM detection of afterglow emission
  18. GRB 050306: Radio Observations
  19. GRB050309: CONCAM pre-trigger and trigger coincident optical
  20. GRB 050306: optical afterglow
  21. GRB 050126: Redshift determination
  22. Swift-BAT trigger 107873: No Swift XRT counterpart
  23. GRB 050306: Confirmation of X-ray afterglow
  24. GRB 050309, Early optical limits from RAPTOR
  25. GRB050309: Early optical limit from P60
  26. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  27. GRB 050309 : Lulin R-band observation
  28. Swift 107873: P60 Optical Observations
  29. GRB 050306: CORRECTION to date of observation
  30. GRB 050306: No Swift UVOT Optical Counterpart Detected
  31. GRB 050306: Possible X-ray Afterglow Position from the Swift
  32. Swift trigger 107518: optical observation
  33. GRB 050306,optical observation
  34. GRB 050306: Swift-BAT detection of a long burst
  35. GRB050215B: Late-Time Swift UVOT Observations
  36. PROMPT VRcIc Observations of GRB 050223
  37. GRB 050219b: candidate NIR afterglow
  38. GRB 050223: optical observations
  39. GRB050223 XMM-Newton observation
  40. INTEGRAL detection of GRB 050223
  41. GRB050223: No Swift UVOT Detection of Afterglow Emission
  42. GRB050223: ROTSE-III Optical Observations
  43. GRB 050223 Swift/BAT detection of a burst
  44. GRB 050223: Swift XRT Position
  45. GRB050219b: CORRECTION to time of UVOT observations
  46. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  47. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  48. GRB 050219b: CORRECTION to refined XRT position
  49. GRB 050219a: Optical observations from LCO
  50. GRB 050219b: Optical and near-IR observations from LCO
  51. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  52. GRB 050219b: Refined XRT position
  53. GRB 050219b: Swift-BAT detection of a burst
  54. GRB 050219b: CORRECTION: Swift XRT Position
  55. GRB 050219b: Swift XRT Position
  56. GRB 050219a, optical observations
  57. GRB 050219a: Refined XRT position
  58. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  59. GRB 050219: Swift-BAT detection of a burst
  60. GRB050215b: Swift UVOT Detection of Afterglow Emission
  61. GRB 050219: Prompt X-ray position
  62. GRB 050215B: Radio Observations
  63. GRB 050215b: XRT confirmation of IR afterglow candidate
  64. GRB050215b: P60 Optical Observations
  65. GRB 050215b: Swift XRT Source Variability
  66. GRB 050215B: candidate afterglow
  67. GRB 050215b : Lulin follow-up observation
  68. GRB 050215b, BOOTES-2 simultaneous optical observations
  69. GRB 050215B: UKIRT K-band imaging
  70. GRB 050215b: Swift XRT Observations
  71. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  72. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  73. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  74. GRB050215B: ROTSE-III optical observations
  75. GRB050215A: ROTSE-III Optical Observations
  76. short/hard GRB 050202, optical observations
  77. GRB 050128: Radio observations
  78. Further analysis of the short Swift-BAT GRB 050202
  79. GRB 050202: Second epoch radio observations
  80. GRB050202: Radio Observations
  81. GRB 050202: Short burst detected by Swift-BAT
  82. GRB 050128 Optical observation with REM
  83. SGR1806-20: Swift-BAT detection of a large normal burst
  84. GRB050128: Faulkes Telescope South observations
  85. GRB 050128: near-infrared observations with REM
  86. GRB050128,optical observations
  87. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  88. GRB050126: Updated Swift XRT Position
  89. GRB 050126: Radio Observations
  90. GRB050128 Swift-BAT observations
  91. GRB 050128: Swift XRT prompt afterglow position
  92. GRB 050124: K-band afterglow observations
  93. GRB050126: MASTER optical limit for KECK OT
  94. GRB050126: Burst Parameters Measured by BAT
  95. GRB050126: MASTER optical observations
  96. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  97. GRB 050126: Prompt XRT detection and localization
  98. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  99. GRB050124: No Swift UVOT Detection of Afterglow Emission
  100. GRB 050117a: Radio Observations

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