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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"

39320 results found.

  1. GRB 050315: Swift-BAT further refined analysis
  2. GRB 050315, SMARTS optical/IR afterglow observations
  3. GRB 050315 I-band observations
  4. GRB050315: Radio afterglow
  5. GRB 050315: Absorption redshift
  6. GRB 050315: Optical afterglow identification
  7. GRB050315: Swift-BAT Refined analysis
  8. Non-detection of GRB050315 in ATCA Radio Observations
  9. GRB 050315: Swift XRT Position
  10. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  11. GRB 050315: Early Observations with Swift/UVOT
  12. Swift-BAT detection of GRB 050315
  13. GRB 050306: Radio Observations
  14. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  15. GRB050309: CONCAM pre-trigger and trigger coincident optical
  16. GRB 050306: optical afterglow
  17. GRB 050126: Redshift determination
  18. Swift-BAT trigger 107873: No Swift XRT counterpart
  19. GRB 050306: Confirmation of X-ray afterglow
  20. GRB 050309, Early optical limits from RAPTOR
  21. GRB 050306: further TAROT optical data
  22. GRB050309: Early optical limit from P60
  23. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  24. GRB 050309 : Lulin R-band observation
  25. Swift 107873: P60 Optical Observations
  26. GRB 050306: CORRECTION to date of observation
  27. GRB 050306: R-band observations
  28. GRB 050306: No Swift UVOT Optical Counterpart Detected
  29. GRB 050306: REM optical-infrared observations
  30. GRB 050306: Possible X-ray Afterglow Position from the Swift
  31. Swift trigger 107518: optical observation
  32. GRB 050306: TAROT optical observations
  33. GRB 050306,optical observation
  34. GRB 050306: Swift-BAT detection of a long burst
  35. GRB 050126: Confirmation of the NIR afterglow candidate
  36. PROMPT VRcIc Observations of GRB 050223
  37. XRF/GRB 050215B: Radio Observations
  38. XMM-Newton Images of GRB 050223
  39. GRB 050219b: candidate NIR afterglow
  40. IBAS GRB Alert #2321
  41. GRB 050223: optical observations
  42. INTEGRAL detection of GRB 050223
  43. GRB 050223 : Planned XMM-Newton observation
  44. GRB050223: ROTSE-III Optical Observations
  45. GRB 050223 Swift/BAT detection of a burst
  46. GRB 050223: Swift XRT Position
  47. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  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. GRB 050219b: Refined XRT position
  52. GRB 050219b: Swift-BAT detection of a burst
  53. GRB 050219b: CORRECTION: Swift XRT Position
  54. GRB 050219b: Swift XRT Position
  55. GRB 050219a, optical observations
  56. GRB 050219a: Refined XRT position
  57. GRB 050219: Swift-BAT detection of a burst
  58. GRB050215b: Swift UVOT Detection of Afterglow Emission
  59. GRB 050219: Prompt X-ray position
  60. GRB 050215B: Radio Observations
  61. GRB 050215b: XRT confirmation of IR afterglow candidate
  62. GRB050215b: P60 Optical Observations
  63. GRB 050215b: Swift XRT Source Variability
  64. GRB 050215B: candidate afterglow
  65. GRB 050215b : Lulin follow-up observation
  66. GRB 050215b, BOOTES-2 simultaneous optical observations
  67. GRB 050215B: UKIRT K-band imaging
  68. GRB 050215b: Swift XRT Observations
  69. GRB 050215b, BOOTES-1B optical limit
  70. GRB050215B: ROTSE-III optical observations
  71. GRB050215A: ROTSE-III Optical Observations
  72. GRB050209: TAROT optical observations
  73. GRB 050209(=U11568): Duration and spectrum
  74. short/hard GRB 050202, optical observations
  75. GRB050209: REM optical observations
  76. GRB 050209 I-band observation
  77. GRB 050209 Optical observations
  78. GRB050209: P60 Optical Observations
  79. GRB050209 (=U11568): A Long GRB Detected by HETE
  80. GRB 050209: Optical observation
  81. GRB 050128: Radio observations
  82. Further analysis of the short Swift-BAT GRB 050202
  83. GRB 050202: Second epoch radio observations
  84. GRB 050129: Optical observations
  85. GRB050202: Radio Observations
  86. GRB 050202: Optical observations with LCO40
  87. GRB 050202: Short burst detected by Swift-BAT
  88. GRB 050128 Optical observation with REM
  89. GRB 050129: a weak long GRB detected with INTEGRAL
  90. GRB050128: Faulkes Telescope South observations
  91. GRB 050124: Radio Observations
  92. GRB 050128: near-infrared observations with REM
  93. GRB050128,optical observations
  94. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  95. GRB 050126: Radio Observations
  96. GRB050128 Swift-BAT observations
  97. GRB 050128: Swift XRT prompt afterglow position
  98. GRB 050124: K-band afterglow observations
  99. GRB050126: MASTER optical limit for KECK OT
  100. GRB050126: Burst Parameters Measured by BAT

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