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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"

42978 results found.

  1. GRB 050306: further TAROT optical data
  2. GRB050309: Early optical limit from P60
  3. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  4. Swift 107873: P60 Optical Observations
  5. GRB 050306: CORRECTION to date of observation
  6. GRB 050306: R-band observations
  7. GRB 050306: No Swift UVOT Optical Counterpart Detected
  8. GRB 050306: REM optical-infrared observations
  9. GRB 050306: Possible X-ray Afterglow Position from the Swift
  10. Swift trigger 107518: optical observation
  11. GRB 050306: TAROT optical observations
  12. GRB 050306,optical observation
  13. GRB 050306: Swift-BAT detection of a long burst
  14. Ongoing activity of SGR 1806-20 after the giant flare
  15. GRB050215B: Late-Time Swift UVOT Observations
  16. GRB 050126: Confirmation of the NIR afterglow candidate
  17. PROMPT VRcIc Observations of GRB 050223
  18. XRF/GRB 050215B: Radio Observations
  19. XMM-Newton Images of GRB 050223
  20. GRB 050219b: candidate NIR afterglow
  21. IBAS GRB Alert #2321
  22. Confirmed XRF nature for GRB050215b
  23. GRB 050223: optical observations
  24. GRB050223 XMM-Newton observation
  25. INTEGRAL detection of GRB 050223
  26. GRB050223: ROTSE-III Optical Observations
  27. GRB 050223 Swift/BAT detection of a burst
  28. GRB 050223: Swift XRT Position
  29. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  30. GRB050219b: CORRECTION to time of UVOT observations
  31. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  32. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  33. GRB 050219b: CORRECTION to refined XRT position
  34. GRB 050219a: Optical observations from LCO
  35. GRB 050219b: Optical and near-IR observations from LCO
  36. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  37. GRB 050219b: Swift-BAT detection of a burst
  38. GRB 050219b: CORRECTION: Swift XRT Position
  39. GRB 050219b: Swift XRT Position
  40. GRB 050219a, optical observations
  41. GRB 050219a: Refined XRT position
  42. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  43. GRB 050219: Swift-BAT detection of a burst
  44. GRB050215b: Swift UVOT Detection of Afterglow Emission
  45. GRB 050219: Prompt X-ray position
  46. GRB 050215B: Radio Observations
  47. GRB 050215b: XRT confirmation of IR afterglow candidate
  48. GRB050215b: P60 Optical Observations
  49. GRB 050215b: Swift XRT Source Variability
  50. GRB 050215B: candidate afterglow
  51. GRB 050215b : Lulin follow-up observation
  52. GRB 050215b, BOOTES-2 simultaneous optical observations
  53. GRB 050215b: Swift XRT Observations
  54. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  55. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  56. GRB 050215b, BOOTES-1B optical limit
  57. GRB050215B: ROTSE-III optical observations
  58. GRB050215A: ROTSE-III Optical Observations
  59. GRB050209: TAROT optical observations
  60. GRB 050209(=U11568): Duration and spectrum
  61. short/hard GRB 050202, optical observations
  62. GRB050209: REM optical observations
  63. GRB 050209 I-band observation
  64. GRB 050209 Optical observations
  65. GRB050209: P60 Optical Observations
  66. GRB050209 (=U11568): A Long GRB Detected by HETE
  67. GRB 050209: Optical observation
  68. GRB 050128: Radio observations
  69. Further analysis of the short Swift-BAT GRB 050202
  70. GRB 050202: Second epoch radio observations
  71. GRB 050129: Optical observations
  72. GRB050202: Radio Observations
  73. GRB 050202: Optical observations with LCO40
  74. GRB 050128 Optical observation with REM
  75. GRB 050129: a weak long GRB detected with INTEGRAL
  76. SGR1806-20: Swift-BAT detection of a large normal burst
  77. GRB050128: Faulkes Telescope South observations
  78. GRB 050124: Radio Observations
  79. GRB 050128: near-infrared observations with REM
  80. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  81. GRB050126: Updated Swift XRT Position
  82. SGR 1806-20: GMRT results at 240 MHz band.
  83. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  84. GRB 050126: Radio Observations
  85. GRB050128 Swift-BAT observations
  86. GRB 050128: Swift XRT prompt afterglow position
  87. GRB 050124: K-band afterglow observations
  88. GRB050126: MASTER optical limit for KECK OT
  89. GRB050126: Burst Parameters Measured by BAT
  90. GRB050126: MASTER optical observations
  91. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  92. GRB 050126: Prompt XRT detection and localization
  93. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  94. GRB050124: No Swift UVOT Detection of Afterglow Emission
  95. GRB 050124, SMARTS optical/IR observations
  96. GRB 050117a: Radio Observations
  97. GRB 050124 I-band observation
  98. GRB 050124: NIR Candidates from Keck/NIRC
  99. GRB050124: Updated Swift XRT Position and Fluxes
  100. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission

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