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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"

41910 results found.

  1. GRB 050315: Optical afterglow identification
  2. GRB050315: Swift-BAT Refined analysis
  3. Non-detection of GRB050315 in ATCA Radio Observations
  4. GRB 050315: Swift XRT Position
  5. GRB 050219b: Gemini/GNIRS near-infrared spectroscopy
  6. GRB 050315: Early Observations with Swift/UVOT
  7. Swift-BAT detection of GRB 050315
  8. GRB050223: No XMM-Newton OM detection of afterglow emission
  9. GRB 050306: Radio Observations
  10. GRB050306: 250 GHz upper limit with MAMBO at the IRAM 30m
  11. GRB050309: CONCAM pre-trigger and trigger coincident optical
  12. GRB 050306: optical afterglow
  13. Swift-BAT trigger 107873: No Swift XRT counterpart
  14. GRB 050306: Confirmation of X-ray afterglow
  15. GRB 050309, Early optical limits from RAPTOR
  16. GRB 050306: further TAROT optical data
  17. GRB050309: Early optical limit from P60
  18. Swift-BAT trigger 107873 (GRB050309): possible X-ray counterparts
  19. Swift 107873: P60 Optical Observations
  20. GRB 050306: CORRECTION to date of observation
  21. GRB 050306: R-band observations
  22. GRB 050306: No Swift UVOT Optical Counterpart Detected
  23. GRB 050306: REM optical-infrared observations
  24. GRB 050306: Possible X-ray Afterglow Position from the Swift
  25. Swift trigger 107518: optical observation
  26. GRB 050306: TAROT optical observations
  27. GRB 050306,optical observation
  28. Ongoing activity of SGR 1806-20 after the giant flare
  29. GRB050215B: Late-Time Swift UVOT Observations
  30. GRB 050126: Confirmation of the NIR afterglow candidate
  31. PROMPT VRcIc Observations of GRB 050223
  32. XRF/GRB 050215B: Radio Observations
  33. GRB 050219b: candidate NIR afterglow
  34. Confirmed XRF nature for GRB050215b
  35. GRB 050223: optical observations
  36. GRB050223 XMM-Newton observation
  37. INTEGRAL detection of GRB 050223
  38. GRB050223: No Swift UVOT Detection of Afterglow Emission
  39. GRB050223: ROTSE-III Optical Observations
  40. GRB 050223: Swift XRT Position
  41. HETE-2 Observations of GRB 050215b (=U11570): A Likely X-Ray Flash
  42. GRB050219b: CORRECTION to time of UVOT observations
  43. GRB050215b: Faulkes North and SDSS limits on UKIRT candidate
  44. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  45. GRB 050219b: CORRECTION to refined XRT position
  46. GRB 050219a: Optical observations from LCO
  47. GRB 050219b: Optical and near-IR observations from LCO
  48. GRB050219b: No Swift UVOT Detection of Afterglow Emission
  49. GRB 050219b: Refined XRT position
  50. GRB 050219b: CORRECTION: Swift XRT Position
  51. GRB 050219b: Swift XRT Position
  52. GRB 050219a, optical observations
  53. GRB 050219a: Refined XRT position
  54. GRB050219a: No Swift UVOT Detection of Afterglow Emission
  55. GRB 050219: Swift-BAT detection of a burst
  56. GRB050215b: Swift UVOT Detection of Afterglow Emission
  57. GRB 050219: Prompt X-ray position
  58. GRB 050215B: Radio Observations
  59. GRB 050215b: XRT confirmation of IR afterglow candidate
  60. GRB050215b: P60 Optical Observations
  61. GRB 050215b: Swift XRT Source Variability
  62. GRB 050215B: candidate afterglow
  63. GRB 050215b : Lulin follow-up observation
  64. GRB 050215b, BOOTES-2 simultaneous optical observations
  65. GRB 050215B: UKIRT K-band imaging
  66. GRB 050215b: Swift XRT Observations
  67. GRB050215b: No Swift UVOT Detection of Afterglow Emission
  68. GRB050215a: No Swift UVOT Detection of Afterglow Emission
  69. Swift-BAT detects two bursts: GRB050215a and GRB050215b
  70. GRB 050215b, BOOTES-1B optical limit
  71. GRB050215B: ROTSE-III optical observations
  72. GRB050215A: ROTSE-III Optical Observations
  73. GRB050209: TAROT optical observations
  74. GRB 050209(=U11568): Duration and spectrum
  75. short/hard GRB 050202, optical observations
  76. GRB050209: REM optical observations
  77. GRB 050209 I-band observation
  78. GRB050209: P60 Optical Observations
  79. GRB050209 (=U11568): A Long GRB Detected by HETE
  80. GRB 050209: Optical observation
  81. GRB 050128: Radio observations
  82. Further analysis of the short Swift-BAT GRB 050202
  83. GRB 050202: Second epoch radio observations
  84. GRB 050129: Optical observations
  85. GRB050202: Radio Observations
  86. GRB 050202: Optical observations with LCO40
  87. GRB 050202: Short burst detected by Swift-BAT
  88. GRB 050128 Optical observation with REM
  89. GRB 050129: a weak long GRB detected with INTEGRAL
  90. GRB050128: Faulkes Telescope South observations
  91. GRB 050124: Radio Observations
  92. GRB 050128: near-infrared observations with REM
  93. GRB050128,optical observations
  94. GRB 050126: A NIR afterglow candidate in the revised XRT error circle
  95. GRB050126: Updated Swift XRT Position
  96. SGR 1806-20: GMRT results at 240 MHz band.
  97. GRB 050126: Radio Observations
  98. GRB050128 Swift-BAT observations
  99. GRB 050128: Swift XRT prompt afterglow position
  100. HETE #3667: P60 Observations

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