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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"

37674 results found.

  1. RXTE Observations of GRB050318
  2. Swift-BAT detection of GRB 050318
  3. GRB 050315, SMARTS optical afterglow decay
  4. GRB050316: MASTER before, simultanious and follow up optical
  5. GRB 050306: ROTSE-III early limits
  6. GRB050316: MASTER optical observations
  7. GRB 050315: Swift-BAT further refined analysis
  8. GRB 050315, SMARTS optical/IR afterglow observations
  9. GRB 050315 I-band observations
  10. GRB050315: Radio afterglow
  11. GRB 050315: Absorption redshift
  12. GRB 050315: Optical afterglow identification
  13. GRB050315: Swift-BAT Refined analysis
  14. Non-detection of GRB050315 in ATCA Radio Observations
  15. GRB 050315: Swift XRT Position
  16. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  17. GRB 050315: Early Observations with Swift/UVOT
  18. Swift-BAT detection of GRB 050315
  19. GRB 050306: Radio Observations
  20. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  21. GRB050309: CONCAM pre-trigger and trigger coincident optical
  22. GRB 050306: optical afterglow
  23. GRB 050126: Redshift determination
  24. Swift-BAT trigger 107873: No Swift XRT counterpart
  25. GRB 050306: Confirmation of X-ray afterglow
  26. GRB 050309, Early optical limits from RAPTOR
  27. GRB 050306: further TAROT optical data
  28. GRB050309: Early optical limit from P60
  29. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  30. GRB 050309 : Lulin R-band observation
  31. Swift 107873: P60 Optical Observations
  32. GRB 050306: CORRECTION to date of observation
  33. GRB 050306: R-band observations
  34. GRB 050306: No Swift UVOT Optical Counterpart Detected
  35. GRB 050306: REM optical-infrared observations
  36. GRB 050306: Possible X-ray Afterglow Position from the Swift
  37. Swift trigger 107518: optical observation
  38. GRB 050306: TAROT optical observations
  39. GRB 050306,optical observation
  40. GRB 050306: Swift-BAT detection of a long burst
  41. GRB 050126: Confirmation of the NIR afterglow candidate
  42. PROMPT VRcIc Observations of GRB 050223
  43. XRF/GRB 050215B: Radio Observations
  44. XMM-Newton Images of GRB 050223
  45. GRB 050219b: candidate NIR afterglow
  46. IBAS GRB Alert #2321
  47. GRB 050223: optical observations
  48. INTEGRAL detection of GRB 050223
  49. GRB 050223 : Planned XMM-Newton observation
  50. GRB050223: ROTSE-III Optical Observations
  51. GRB 050223 Swift/BAT detection of a burst
  52. GRB 050223: Swift XRT Position
  53. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  54. GRB 050219b: CORRECTION to refined XRT position
  55. GRB 050219a: Optical observations from LCO
  56. GRB 050219b: Optical and near-IR observations from LCO
  57. GRB 050219b: Refined XRT position
  58. GRB 050219b: Swift-BAT detection of a burst
  59. GRB 050219b: CORRECTION: Swift XRT Position
  60. GRB 050219b: Swift XRT Position
  61. GRB 050219a, optical observations
  62. GRB 050219a: Refined XRT position
  63. GRB 050219: Swift-BAT detection of a burst
  64. GRB050215b: Swift UVOT Detection of Afterglow Emission
  65. GRB 050219: Prompt X-ray position
  66. GRB 050215B: Radio Observations
  67. GRB 050215b: XRT confirmation of IR afterglow candidate
  68. GRB050215b: P60 Optical Observations
  69. GRB 050215b: Swift XRT Source Variability
  70. GRB 050215B: candidate afterglow
  71. GRB 050215b : Lulin follow-up observation
  72. GRB 050215b, BOOTES-2 simultaneous optical observations
  73. GRB 050215B: UKIRT K-band imaging
  74. GRB 050215b: Swift XRT Observations
  75. GRB 050215b, BOOTES-1B optical limit
  76. GRB050215A: ROTSE-III Optical Observations
  77. GRB050209: TAROT optical observations
  78. GRB 050209(=U11568): Duration and spectrum
  79. short/hard GRB 050202, optical observations
  80. GRB050209: REM optical observations
  81. GRB 050209 I-band observation
  82. GRB 050209 Optical observations
  83. GRB050209: P60 Optical Observations
  84. GRB050209 (=U11568): A Long GRB Detected by HETE
  85. GRB 050209: Optical observation
  86. GRB 050128: Radio observations
  87. Further analysis of the short Swift-BAT GRB 050202
  88. GRB 050202: Second epoch radio observations
  89. GRB 050129: Optical observations
  90. GRB050202: Radio Observations
  91. GRB 050202: Optical observations with LCO40
  92. GRB 050202: Short burst detected by Swift-BAT
  93. GRB 050128 Optical observation with REM
  94. GRB 050129: a weak long GRB detected with INTEGRAL
  95. GRB050128: Faulkes Telescope South observations
  96. GRB 050124: Radio Observations
  97. GRB 050128: near-infrared observations with REM
  98. GRB050128,optical observations
  99. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  100. GRB 050126: Radio Observations

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