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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"

42841 results found.

  1. Refined Swift XRT positions for GRB050315, GRB050318 and GRB050319
  2. GRB050319: VLA Observations
  3. GRB 050319 R band observations
  4. GRB 050319: Swift-UVOT detection of the afterglow
  5. GRB 050315: Variability Analysis of Swift BAT Time History
  6. GRB050319: Radio Observations
  7. GRB 050319: NIR afterglow candidate
  8. GRB 050319:Near IR afterglow
  9. GRB050319: BR optical photometry
  10. GRB 050318: SWIFT-UVOT refined analysis
  11. GRB 050319: Swift-BAT refined analysis
  12. GRB050319,optical observation
  13. Swift Detection of GRB 050319
  14. GRB 050319: Detection of Possible Optical Counterpart
  15. GRB 050318: Swift/UVOT detection of afterglow emission
  16. GRB 050318: Magellan optical afterglow identification
  17. GRB050318: Swift XRT position
  18. RXTE Observations of GRB050318
  19. Swift-BAT detection of GRB 050318
  20. GRB 050315, SMARTS optical afterglow decay
  21. GRB050223: analysis of the XMM-Newton observation
  22. GRB050316: MASTER before, simultanious and follow up optical
  23. GRB 050306: ROTSE-III early limits
  24. GRB 050315: Swift-BAT further refined analysis
  25. GRB 050315 I-band observations
  26. GRB050315: Radio afterglow
  27. GRB 050315: Absorption redshift
  28. GRB 050315: Optical afterglow identification
  29. GRB050315: Swift-BAT Refined analysis
  30. Non-detection of GRB050315 in ATCA Radio Observations
  31. GRB 050315: Swift XRT Position
  32. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  33. GRB 050315: Early Observations with Swift/UVOT
  34. Swift-BAT detection of GRB 050315
  35. GRB050223: No XMM-Newton OM detection of afterglow emission
  36. GRB 050306: Radio Observations
  37. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  38. GRB050309: CONCAM pre-trigger and trigger coincident optical
  39. GRB 050306: optical afterglow
  40. GRB 050126: Redshift determination
  41. Swift-BAT trigger 107873: No Swift XRT counterpart
  42. GRB 050306: Confirmation of X-ray afterglow
  43. GRB 050309, Early optical limits from RAPTOR
  44. GRB 050306: further TAROT optical data
  45. GRB050309: Early optical limit from P60
  46. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  47. GRB 050309 : Lulin R-band observation
  48. Swift 107873: P60 Optical Observations
  49. GRB 050306: CORRECTION to date of observation
  50. GRB 050306: R-band observations
  51. GRB 050306: No Swift UVOT Optical Counterpart Detected
  52. GRB 050306: REM optical-infrared observations
  53. GRB 050306: Possible X-ray Afterglow Position from the Swift
  54. Swift trigger 107518: optical observation
  55. GRB 050306: TAROT optical observations
  56. GRB 050306,optical observation
  57. GRB 050306: Swift-BAT detection of a long burst
  58. Ongoing activity of SGR 1806-20 after the giant flare
  59. GRB050215B: Late-Time Swift UVOT Observations
  60. GRB 050126: Confirmation of the NIR afterglow candidate
  61. PROMPT VRcIc Observations of GRB 050223
  62. XRF/GRB 050215B: Radio Observations
  63. GRB 050219b: candidate NIR afterglow
  64. IBAS GRB Alert #2321
  65. Confirmed XRF nature for GRB050215b
  66. GRB 050223: optical observations
  67. GRB050223 XMM-Newton observation
  68. INTEGRAL detection of GRB 050223
  69. GRB050223: No Swift UVOT Detection of Afterglow Emission
  70. GRB050223: ROTSE-III Optical Observations
  71. GRB 050223 Swift/BAT detection of a burst
  72. GRB 050223: Swift XRT Position
  73. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  74. GRB050219b: CORRECTION to time of UVOT observations
  75. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  76. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  77. GRB 050219b: CORRECTION to refined XRT position
  78. GRB 050219a: Optical observations from LCO
  79. GRB 050219b: Optical and near-IR observations from LCO
  80. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  81. GRB 050219b: Refined XRT position
  82. GRB 050219b: Swift-BAT detection of a burst
  83. GRB 050219b: CORRECTION: Swift XRT Position
  84. GRB 050219b: Swift XRT Position
  85. GRB 050219a, optical observations
  86. GRB 050219a: Refined XRT position
  87. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  88. GRB 050219: Swift-BAT detection of a burst
  89. GRB050215b: Swift UVOT Detection of Afterglow Emission
  90. GRB 050219: Prompt X-ray position
  91. GRB 050215B: Radio Observations
  92. GRB 050215b: XRT confirmation of IR afterglow candidate
  93. GRB050215b: P60 Optical Observations
  94. GRB 050215b: Swift XRT Source Variability
  95. GRB 050215B: candidate afterglow
  96. GRB 050215b : Lulin follow-up observation
  97. GRB 050215b, BOOTES-2 simultaneous optical observations
  98. GRB 050215B: UKIRT K-band imaging
  99. GRB 050215b: Swift XRT Observations
  100. GRB050215b: No Swift UVOT Detection of Afterglow Emission

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