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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"

32715 results found.

  1. GRB 050319 R band observations
  2. GRB 050319: Swift-UVOT detection of the afterglow
  3. GRB 050315: Variability Analysis of Swift BAT Time History
  4. GRB050319: Radio Observations
  5. GRB 050319: NIR afterglow candidate
  6. GRB 050319:Near IR afterglow
  7. GRB050319: BR optical photometry
  8. GRB 050318: SWIFT-UVOT refined analysis
  9. GRB 050318: Absorption redshift from Magellan
  10. GRB 050319: Optical observation
  11. GRB 050319: Swift-BAT refined analysis
  12. GRB050319,optical observation
  13. GRB 050318: Swift/UVOT detection of afterglow emission
  14. GRB 050318: Magellan optical afterglow identification
  15. GRB050318: Swift XRT position
  16. RXTE Observations of GRB050318
  17. GRB 050315, SMARTS optical afterglow decay
  18. GRB050223: analysis of the XMM-Newton observation
  19. GRB050316: MASTER before, simultanious and follow up optical
  20. GRB 050306: ROTSE-III early limits
  21. GRB 050315: Swift-BAT further refined analysis
  22. GRB 050315, SMARTS optical/IR afterglow observations
  23. GRB 050315 I-band observations
  24. GRB050315: Radio afterglow
  25. GRB 050315: Absorption redshift
  26. GRB 050315: Optical afterglow identification
  27. GRB050315: Swift-BAT Refined analysis
  28. Non-detection of GRB050315 in ATCA Radio Observations
  29. GRB 050315: Swift XRT Position
  30. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  31. GRB 050315: Early Observations with Swift/UVOT
  32. GRB050223: No XMM-Newton OM detection of afterglow emission
  33. GRB 050306: Radio Observations
  34. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  35. GRB 050306: optical afterglow
  36. Swift-BAT trigger 107873: No Swift XRT counterpart
  37. GRB 050306: Confirmation of X-ray afterglow
  38. GRB 050309, Early optical limits from RAPTOR
  39. GRB050309: Early optical limit from P60
  40. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  41. GRB 050306: CORRECTION to date of observation
  42. GRB 050306: R-band observations
  43. GRB 050306: No Swift UVOT Optical Counterpart Detected
  44. GRB 050306: REM optical-infrared observations
  45. GRB 050306: Possible X-ray Afterglow Position from the Swift
  46. GRB 050306,optical observation
  47. GRB050215B: Late-Time Swift UVOT Observations
  48. PROMPT VRcIc Observations of GRB 050223
  49. XRF/GRB 050215B: Radio Observations
  50. GRB 050219b: candidate NIR afterglow
  51. GRB 050223: optical observations
  52. GRB050223 XMM-Newton observation
  53. INTEGRAL detection of GRB 050223
  54. GRB050223: No Swift UVOT Detection of Afterglow Emission
  55. GRB050223: ROTSE-III Optical Observations
  56. GRB050219b: CORRECTION to time of UVOT observations
  57. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  58. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  59. GRB 050219b: CORRECTION to refined XRT position
  60. GRB 050219a: Optical observations from LCO
  61. GRB 050219b: Optical and near-IR observations from LCO
  62. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  63. GRB 050219b: CORRECTION: Swift XRT Position
  64. GRB 050219a, optical observations
  65. GRB 050219a: Refined XRT position
  66. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  67. GRB 050219: Swift-BAT detection of a burst
  68. GRB050215b: Swift UVOT Detection of Afterglow Emission
  69. GRB 050215B: Radio Observations
  70. GRB 050215b: XRT confirmation of IR afterglow candidate
  71. GRB050215b: P60 Optical Observations
  72. GRB 050215b: Swift XRT Source Variability
  73. GRB 050215B: candidate afterglow
  74. GRB 050215b : Lulin follow-up observation
  75. GRB 050215b, BOOTES-2 simultaneous optical observations
  76. GRB 050215B: UKIRT K-band imaging
  77. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  78. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  79. GRB 050215b, BOOTES-1B optical limit
  80. GRB050215A: ROTSE-III Optical Observations
  81. GRB050209: TAROT optical observations
  82. short/hard GRB 050202, optical observations
  83. GRB050209: REM optical observations
  84. GRB 050209 I-band observation
  85. GRB050209: P60 Optical Observations
  86. GRB050209 (=U11568): A Long GRB Detected by HETE
  87. GRB 050128: Radio observations
  88. Further analysis of the short Swift-BAT GRB 050202
  89. GRB 050202: Second epoch radio observations
  90. GRB 050129: Optical observations
  91. GRB050202: Radio Observations
  92. GRB 050202: Optical observations with LCO40
  93. GRB 050128 Optical observation with REM
  94. GRB050128: Faulkes Telescope South observations
  95. GRB 050124: Radio Observations
  96. GRB 050128: near-infrared observations with REM
  97. GRB050128,optical observations
  98. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  99. GRB 050126: Radio Observations
  100. GRB050128 Swift-BAT observations

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