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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"

41706 results found.

  1. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  2. GRB 050309 : Lulin R-band observation
  3. Swift 107873: P60 Optical Observations
  4. GRB 050306: CORRECTION to date of observation
  5. GRB 050306: R-band observations
  6. GRB 050306: No Swift UVOT Optical Counterpart Detected
  7. GRB 050306: REM optical-infrared observations
  8. GRB 050306: Possible X-ray Afterglow Position from the Swift
  9. Swift trigger 107518: optical observation
  10. GRB 050306: TAROT optical observations
  11. GRB 050306,optical observation
  12. GRB 050306: Swift-BAT detection of a long burst
  13. Ongoing activity of SGR 1806-20 after the giant flare
  14. GRB050215B: Late-Time Swift UVOT Observations
  15. GRB 050126: Confirmation of the NIR afterglow candidate
  16. PROMPT VRcIc Observations of GRB 050223
  17. XRF/GRB 050215B: Radio Observations
  18. GRB 050219b: candidate NIR afterglow
  19. Confirmed XRF nature for GRB050215b
  20. GRB 050223: optical observations
  21. GRB050223 XMM-Newton observation
  22. INTEGRAL detection of GRB 050223
  23. GRB050223: No Swift UVOT Detection of Afterglow Emission
  24. GRB050223: ROTSE-III Optical Observations
  25. GRB 050223 Swift/BAT detection of a burst
  26. GRB 050223: Swift XRT Position
  27. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  28. GRB050219b: CORRECTION to time of UVOT observations
  29. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  30. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  31. GRB 050219a: Optical observations from LCO
  32. GRB 050219b: Optical and near-IR observations from LCO
  33. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  34. GRB 050219b: Swift-BAT detection of a burst
  35. GRB 050219b: CORRECTION: Swift XRT Position
  36. GRB 050219b: Swift XRT Position
  37. GRB 050219a, optical observations
  38. GRB 050219a: Refined XRT position
  39. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  40. GRB 050219: Swift-BAT detection of a burst
  41. GRB050215b: Swift UVOT Detection of Afterglow Emission
  42. GRB 050215B: Radio Observations
  43. GRB 050215b: XRT confirmation of IR afterglow candidate
  44. GRB050215b: P60 Optical Observations
  45. GRB 050215b: Swift XRT Source Variability
  46. GRB 050215b : Lulin follow-up observation
  47. GRB 050215b, BOOTES-2 simultaneous optical observations
  48. GRB 050215B: UKIRT K-band imaging
  49. GRB 050215b: Swift XRT Observations
  50. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  51. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  52. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  53. GRB 050215b, BOOTES-1B optical limit
  54. GRB050215B: ROTSE-III optical observations
  55. GRB050215A: ROTSE-III Optical Observations
  56. GRB050209: TAROT optical observations
  57. GRB 050209(=U11568): Duration and spectrum
  58. short/hard GRB 050202, optical observations
  59. GRB050209: REM optical observations
  60. GRB 050209 I-band observation
  61. GRB 050209 Optical observations
  62. GRB050209: P60 Optical Observations
  63. GRB 050209: Optical observation
  64. GRB 050128: Radio observations
  65. Further analysis of the short Swift-BAT GRB 050202
  66. GRB 050202: Second epoch radio observations
  67. GRB 050129: Optical observations
  68. GRB050202: Radio Observations
  69. GRB 050202: Optical observations with LCO40
  70. GRB 050202: Short burst detected by Swift-BAT
  71. GRB 050128 Optical observation with REM
  72. GRB 050129: a weak long GRB detected with INTEGRAL
  73. SGR1806-20: Swift-BAT detection of a large normal burst
  74. GRB050128: Faulkes Telescope South observations
  75. GRB 050124: Radio Observations
  76. GRB 050128: near-infrared observations with REM
  77. GRB050128,optical observations
  78. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  79. SGR 1806-20: GMRT results at 240 MHz band.
  80. SGR 1806-20: low frequency GMRT results of 2005 Jan 16.
  81. GRB 050126: Radio Observations
  82. GRB050128 Swift-BAT observations
  83. GRB 050128: Swift XRT prompt afterglow position
  84. HETE #3667: P60 Observations
  85. GRB 050124: K-band afterglow observations
  86. GRB050126: Burst Parameters Measured by BAT
  87. GRB050126: MASTER optical observations
  88. GRB 050126: Detection of NIR afterglow with Keck/NIRC
  89. GRB 050126: Prompt XRT detection and localization
  90. GRB 050124: NIR afterglow confirmed with Keck/NIRC
  91. GRB050124: No Swift UVOT Detection of Afterglow Emission
  92. GRB 050124, SMARTS optical/IR observations
  93. GRB 050117a: Radio Observations
  94. GRB 050124 I-band observation
  95. GRB 050124: NIR Candidates from Keck/NIRC
  96. GRB050124,optical observation
  97. GRB 050124 : Lulin R-band follow-up observation
  98. GRB050124: Updated Swift XRT Position and Fluxes
  99. GRB 050124: Swift XRT Detection of X-ray Afterglow Emission
  100. GRB050124: Refined BAT position, spectral and fluence information

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