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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"

42287 results found.

  1. GRB050319: Radio Observations
  2. GRB 050319: NIR afterglow candidate
  3. GRB 050319:Near IR afterglow
  4. GRB050319: BR optical photometry
  5. GRB 050318: SWIFT-UVOT refined analysis
  6. GRB 050319: Optical observation
  7. GRB 050319 : Confirmation of optical afterglow decay
  8. GRB050319,optical observation
  9. Swift Detection of GRB 050319
  10. GRB 050319: Detection of Possible Optical Counterpart
  11. GRB 050318: Swift/UVOT detection of afterglow emission
  12. GRB 050318: Magellan optical afterglow identification
  13. GRB050318: Swift XRT position
  14. RXTE Observations of GRB050318
  15. Swift-BAT detection of GRB 050318
  16. GRB 050315, SMARTS optical afterglow decay
  17. GRB050223: analysis of the XMM-Newton observation
  18. GRB050316: MASTER before, simultanious and follow up optical
  19. GRB 050306: ROTSE-III early limits
  20. GRB050316: MASTER optical observations
  21. GRB 050315: Swift-BAT further refined analysis
  22. GRB 050315, SMARTS optical/IR afterglow observations
  23. GRB 050315 I-band observations
  24. GRB050315: Radio afterglow
  25. GRB 050315: Optical afterglow identification
  26. GRB 050315: Swift XRT Position
  27. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  28. GRB 050315: Early Observations with Swift/UVOT
  29. Swift-BAT detection of GRB 050315
  30. GRB050223: No XMM-Newton OM detection of afterglow emission
  31. GRB 050306: Radio Observations
  32. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  33. GRB050309: CONCAM pre-trigger and trigger coincident optical
  34. GRB 050306: optical afterglow
  35. GRB 050126: Redshift determination
  36. Swift-BAT trigger 107873: No Swift XRT counterpart
  37. GRB 050309, Early optical limits from RAPTOR
  38. GRB 050306: further TAROT optical data
  39. GRB050309: Early optical limit from P60
  40. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  41. GRB 050309 : Lulin R-band observation
  42. Swift 107873: P60 Optical Observations
  43. GRB 050306: CORRECTION to date of observation
  44. GRB 050306: R-band observations
  45. GRB 050306: No Swift UVOT Optical Counterpart Detected
  46. GRB 050306: REM optical-infrared observations
  47. GRB 050306: Possible X-ray Afterglow Position from the Swift
  48. Swift trigger 107518: optical observation
  49. GRB 050306: TAROT optical observations
  50. GRB 050306,optical observation
  51. GRB 050306: Swift-BAT detection of a long burst
  52. Ongoing activity of SGR 1806-20 after the giant flare
  53. GRB050215B: Late-Time Swift UVOT Observations
  54. GRB 050126: Confirmation of the NIR afterglow candidate
  55. PROMPT VRcIc Observations of GRB 050223
  56. XRF/GRB 050215B: Radio Observations
  57. GRB 050219b: candidate NIR afterglow
  58. Confirmed XRF nature for GRB050215b
  59. GRB 050223: optical observations
  60. GRB050223 XMM-Newton observation
  61. INTEGRAL detection of GRB 050223
  62. GRB 050223 : Planned XMM-Newton observation
  63. GRB050223: No Swift UVOT Detection of Afterglow Emission
  64. GRB050223: ROTSE-III Optical Observations
  65. GRB 050223 Swift/BAT detection of a burst
  66. GRB 050223: Swift XRT Position
  67. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  68. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  69. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  70. GRB 050219b: CORRECTION to refined XRT position
  71. GRB 050219a: Optical observations from LCO
  72. GRB 050219b: Optical and near-IR observations from LCO
  73. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  74. GRB 050219b: Swift-BAT detection of a burst
  75. GRB 050219b: CORRECTION: Swift XRT Position
  76. GRB 050219b: Swift XRT Position
  77. GRB 050219a, optical observations
  78. GRB 050219a: Refined XRT position
  79. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  80. GRB 050219: Swift-BAT detection of a burst
  81. GRB050215b: Swift UVOT Detection of Afterglow Emission
  82. GRB 050219: Prompt X-ray position
  83. GRB 050215B: Radio Observations
  84. GRB 050215b: XRT confirmation of IR afterglow candidate
  85. GRB050215b: P60 Optical Observations
  86. GRB 050215b: Swift XRT Source Variability
  87. GRB 050215B: candidate afterglow
  88. GRB 050215b : Lulin follow-up observation
  89. GRB 050215b, BOOTES-2 simultaneous optical observations
  90. GRB 050215B: UKIRT K-band imaging
  91. GRB 050215b: Swift XRT Observations
  92. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  93. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  94. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  95. GRB 050215b, BOOTES-1B optical limit
  96. GRB050215B: ROTSE-III optical observations
  97. GRB050215A: ROTSE-III Optical Observations
  98. GRB050209: TAROT optical observations
  99. GRB 050209(=U11568): Duration and spectrum
  100. short/hard GRB 050202, optical observations

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