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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"

37580 results found.

  1. GRB050319,optical observation
  2. Swift Detection of GRB 050319
  3. GRB 050319: Detection of Possible Optical Counterpart
  4. GRB 050318: Swift/UVOT detection of afterglow emission
  5. GRB 050318: Magellan optical afterglow identification
  6. GRB050318: Swift XRT position
  7. RXTE Observations of GRB050318
  8. Swift-BAT detection of GRB 050318
  9. GRB 050315, SMARTS optical afterglow decay
  10. GRB050316: MASTER before, simultanious and follow up optical
  11. GRB 050306: ROTSE-III early limits
  12. GRB050316: MASTER optical observations
  13. GRB 050315: Swift-BAT further refined analysis
  14. GRB 050315, SMARTS optical/IR afterglow observations
  15. GRB 050315 I-band observations
  16. GRB050315: Radio afterglow
  17. GRB 050315: Absorption redshift
  18. GRB 050315: Optical afterglow identification
  19. GRB050315: Swift-BAT Refined analysis
  20. Non-detection of GRB050315 in ATCA Radio Observations
  21. GRB 050315: Swift XRT Position
  22. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  23. GRB 050315: Early Observations with Swift/UVOT
  24. Swift-BAT detection of GRB 050315
  25. GRB 050306: Radio Observations
  26. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  27. GRB050309: CONCAM pre-trigger and trigger coincident optical
  28. GRB 050306: optical afterglow
  29. GRB 050126: Redshift determination
  30. Swift-BAT trigger 107873: No Swift XRT counterpart
  31. GRB 050306: Confirmation of X-ray afterglow
  32. GRB 050309, Early optical limits from RAPTOR
  33. GRB 050306: further TAROT optical data
  34. GRB050309: Early optical limit from P60
  35. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  36. GRB 050309 : Lulin R-band observation
  37. Swift 107873: P60 Optical Observations
  38. GRB 050306: CORRECTION to date of observation
  39. GRB 050306: R-band observations
  40. GRB 050306: No Swift UVOT Optical Counterpart Detected
  41. GRB 050306: REM optical-infrared observations
  42. GRB 050306: Possible X-ray Afterglow Position from the Swift
  43. Swift trigger 107518: optical observation
  44. GRB 050306: TAROT optical observations
  45. GRB 050306,optical observation
  46. GRB 050306: Swift-BAT detection of a long burst
  47. GRB 050126: Confirmation of the NIR afterglow candidate
  48. PROMPT VRcIc Observations of GRB 050223
  49. XRF/GRB 050215B: Radio Observations
  50. XMM-Newton Images of GRB 050223
  51. GRB 050219b: candidate NIR afterglow
  52. IBAS GRB Alert #2321
  53. GRB 050223: optical observations
  54. INTEGRAL detection of GRB 050223
  55. GRB 050223 : Planned XMM-Newton observation
  56. GRB050223: ROTSE-III Optical Observations
  57. GRB 050223 Swift/BAT detection of a burst
  58. GRB 050223: Swift XRT Position
  59. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  60. GRB 050219b: CORRECTION to refined XRT position
  61. GRB 050219a: Optical observations from LCO
  62. GRB 050219b: Optical and near-IR observations from LCO
  63. GRB 050219b: Refined XRT position
  64. GRB 050219b: Swift-BAT detection of a burst
  65. GRB 050219b: CORRECTION: Swift XRT Position
  66. GRB 050219b: Swift XRT Position
  67. GRB 050219a, optical observations
  68. GRB 050219a: Refined XRT position
  69. GRB 050219: Swift-BAT detection of a burst
  70. GRB050215b: Swift UVOT Detection of Afterglow Emission
  71. GRB 050219: Prompt X-ray position
  72. GRB 050215B: Radio Observations
  73. GRB 050215b: XRT confirmation of IR afterglow candidate
  74. GRB050215b: P60 Optical Observations
  75. GRB 050215b: Swift XRT Source Variability
  76. GRB 050215B: candidate afterglow
  77. GRB 050215b : Lulin follow-up observation
  78. GRB 050215b, BOOTES-2 simultaneous optical observations
  79. GRB 050215B: UKIRT K-band imaging
  80. GRB 050215b: Swift XRT Observations
  81. GRB 050215b, BOOTES-1B optical limit
  82. GRB050215A: ROTSE-III Optical Observations
  83. GRB050209: TAROT optical observations
  84. GRB 050209(=U11568): Duration and spectrum
  85. short/hard GRB 050202, optical observations
  86. GRB050209: REM optical observations
  87. GRB 050209 I-band observation
  88. GRB 050209 Optical observations
  89. GRB050209: P60 Optical Observations
  90. GRB050209 (=U11568): A Long GRB Detected by HETE
  91. GRB 050209: Optical observation
  92. GRB 050128: Radio observations
  93. Further analysis of the short Swift-BAT GRB 050202
  94. GRB 050202: Second epoch radio observations
  95. GRB 050129: Optical observations
  96. GRB050202: Radio Observations
  97. GRB 050202: Optical observations with LCO40
  98. GRB 050202: Short burst detected by Swift-BAT
  99. GRB 050128 Optical observation with REM
  100. GRB 050129: a weak long GRB detected with INTEGRAL

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