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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"

30506 results found.

  1. GRB 050319: Optical observation
  2. GRB 050319: Swift-BAT refined analysis
  3. GRB050319,optical observation
  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. GRB 050315, SMARTS optical afterglow decay
  9. GRB050223: analysis of the XMM-Newton observation
  10. GRB050316: MASTER before, simultanious and follow up optical
  11. GRB 050306: ROTSE-III early limits
  12. GRB 050315: Swift-BAT further refined analysis
  13. GRB 050315, SMARTS optical/IR afterglow observations
  14. GRB 050315 I-band observations
  15. GRB050315: Radio afterglow
  16. GRB 050315: Absorption redshift
  17. GRB 050315: Optical afterglow identification
  18. GRB050315: Swift-BAT Refined analysis
  19. Non-detection of GRB050315 in ATCA Radio Observations
  20. GRB 050315: Swift XRT Position
  21. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  22. GRB 050315: Early Observations with Swift/UVOT
  23. GRB050223: No XMM-Newton OM detection of afterglow emission
  24. GRB 050306: Radio Observations
  25. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  26. GRB 050306: optical afterglow
  27. Swift-BAT trigger 107873: No Swift XRT counterpart
  28. GRB 050306: Confirmation of X-ray afterglow
  29. GRB 050309, Early optical limits from RAPTOR
  30. GRB050309: Early optical limit from P60
  31. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  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. GRB 050306,optical observation
  38. GRB050215B: Late-Time Swift UVOT Observations
  39. PROMPT VRcIc Observations of GRB 050223
  40. XRF/GRB 050215B: Radio Observations
  41. GRB 050219b: candidate NIR afterglow
  42. GRB 050223: optical observations
  43. GRB050223 XMM-Newton observation
  44. INTEGRAL detection of GRB 050223
  45. GRB050223: No Swift UVOT Detection of Afterglow Emission
  46. GRB050223: ROTSE-III Optical Observations
  47. GRB050219b: CORRECTION to time of UVOT observations
  48. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  49. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  50. GRB 050219b: CORRECTION to refined XRT position
  51. GRB 050219a: Optical observations from LCO
  52. GRB 050219b: Optical and near-IR observations from LCO
  53. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  54. GRB 050219b: CORRECTION: Swift XRT Position
  55. GRB 050219a, optical observations
  56. GRB 050219a: Refined XRT position
  57. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  58. GRB 050219: Swift-BAT detection of a burst
  59. GRB050215b: Swift UVOT Detection of Afterglow Emission
  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. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  69. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  70. GRB 050215b, BOOTES-1B optical limit
  71. GRB050215A: ROTSE-III Optical Observations
  72. GRB050209: TAROT optical observations
  73. short/hard GRB 050202, optical observations
  74. GRB050209: REM optical observations
  75. GRB 050209 I-band observation
  76. GRB050209: P60 Optical Observations
  77. GRB050209 (=U11568): A Long GRB Detected by HETE
  78. GRB 050128: Radio observations
  79. Further analysis of the short Swift-BAT GRB 050202
  80. GRB 050202: Second epoch radio observations
  81. GRB 050129: Optical observations
  82. GRB050202: Radio Observations
  83. GRB 050202: Optical observations with LCO40
  84. GRB 050128 Optical observation with REM
  85. GRB050128: Faulkes Telescope South observations
  86. GRB 050124: Radio Observations
  87. GRB 050128: near-infrared observations with REM
  88. GRB050128,optical observations
  89. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  90. GRB 050126: Radio Observations
  91. GRB050128 Swift-BAT observations
  92. GRB 050128: Swift XRT prompt afterglow position
  93. GRB 050124: K-band afterglow observations
  94. GRB050126: MASTER optical limit for KECK OT
  95. GRB050126: Burst Parameters Measured by BAT
  96. GRB050126: MASTER optical observations
  97. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  98. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  99. GRB050124: No Swift UVOT Detection of Afterglow Emission
  100. GRB 050124, SMARTS optical/IR observations

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