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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"

37918 results found.

  1. GRB 050318: Magellan optical afterglow identification
  2. GRB050318: Swift XRT position
  3. RXTE Observations of GRB050318
  4. Swift-BAT detection of GRB 050318
  5. GRB 050315, SMARTS optical afterglow decay
  6. GRB050223: analysis of the XMM-Newton observation
  7. GRB050316: MASTER before, simultanious and follow up optical
  8. GRB 050306: ROTSE-III early limits
  9. GRB050316: MASTER optical observations
  10. GRB 050315: Swift-BAT further refined analysis
  11. GRB 050315, SMARTS optical/IR afterglow observations
  12. GRB 050315 I-band observations
  13. GRB050315: Radio afterglow
  14. GRB 050315: Absorption redshift
  15. GRB 050315: Optical afterglow identification
  16. GRB050315: Swift-BAT Refined analysis
  17. Non-detection of GRB050315 in ATCA Radio Observations
  18. GRB 050315: Swift XRT Position
  19. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  20. GRB 050315: Early Observations with Swift/UVOT
  21. Swift-BAT detection of GRB 050315
  22. GRB050223: No XMM-Newton OM detection of afterglow emission
  23. GRB 050306: Radio Observations
  24. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  25. GRB050309: CONCAM pre-trigger and trigger coincident optical
  26. GRB 050306: optical afterglow
  27. GRB 050126: Redshift determination
  28. Swift-BAT trigger 107873: No Swift XRT counterpart
  29. GRB 050306: Confirmation of X-ray afterglow
  30. GRB 050309, Early optical limits from RAPTOR
  31. GRB 050306: further TAROT optical data
  32. GRB050309: Early optical limit from P60
  33. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  34. GRB 050309 : Lulin R-band observation
  35. Swift 107873: P60 Optical Observations
  36. GRB 050306: CORRECTION to date of observation
  37. GRB 050306: R-band observations
  38. GRB 050306: No Swift UVOT Optical Counterpart Detected
  39. GRB 050306: REM optical-infrared observations
  40. GRB 050306: Possible X-ray Afterglow Position from the Swift
  41. Swift trigger 107518: optical observation
  42. GRB 050306: TAROT optical observations
  43. GRB 050306,optical observation
  44. GRB 050306: Swift-BAT detection of a long burst
  45. GRB050215B: Late-Time Swift UVOT Observations
  46. GRB 050126: Confirmation of the NIR afterglow candidate
  47. PROMPT VRcIc Observations of GRB 050223
  48. XRF/GRB 050215B: Radio Observations
  49. XMM-Newton Images of GRB 050223
  50. GRB 050219b: candidate NIR afterglow
  51. IBAS GRB Alert #2321
  52. GRB 050223: optical observations
  53. GRB050223 XMM-Newton observation
  54. INTEGRAL detection of GRB 050223
  55. GRB 050223 : Planned XMM-Newton observation
  56. GRB050223: No Swift UVOT Detection of Afterglow Emission
  57. GRB050223: ROTSE-III Optical Observations
  58. GRB 050223 Swift/BAT detection of a burst
  59. GRB 050223: Swift XRT Position
  60. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  61. GRB050219b: CORRECTION to time of UVOT observations
  62. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  63. GRB 050219b: CORRECTION to refined XRT position
  64. GRB 050219a: Optical observations from LCO
  65. GRB 050219b: Optical and near-IR observations from LCO
  66. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  67. GRB 050219b: Refined XRT position
  68. GRB 050219b: Swift-BAT detection of a burst
  69. GRB 050219b: CORRECTION: Swift XRT Position
  70. GRB 050219b: Swift XRT Position
  71. GRB 050219a, optical observations
  72. GRB 050219a: Refined XRT position
  73. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  74. GRB 050219: Swift-BAT detection of a burst
  75. GRB050215b: Swift UVOT Detection of Afterglow Emission
  76. GRB 050219: Prompt X-ray position
  77. GRB 050215B: Radio Observations
  78. GRB 050215b: XRT confirmation of IR afterglow candidate
  79. GRB050215b: P60 Optical Observations
  80. GRB 050215b: Swift XRT Source Variability
  81. GRB 050215B: candidate afterglow
  82. GRB 050215b : Lulin follow-up observation
  83. GRB 050215b, BOOTES-2 simultaneous optical observations
  84. GRB 050215B: UKIRT K-band imaging
  85. GRB 050215b: Swift XRT Observations
  86. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  87. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  88. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  89. GRB 050215b, BOOTES-1B optical limit
  90. GRB050215B: ROTSE-III optical observations
  91. GRB050215A: ROTSE-III Optical Observations
  92. GRB050209: TAROT optical observations
  93. GRB 050209(=U11568): Duration and spectrum
  94. short/hard GRB 050202, optical observations
  95. GRB050209: REM optical observations
  96. GRB 050209 I-band observation
  97. GRB 050209 Optical observations
  98. GRB050209: P60 Optical Observations
  99. GRB050209 (=U11568): A Long GRB Detected by HETE
  100. GRB 050209: Optical observation

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