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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"

42293 results found.

  1. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  2. GRB 070311: REM candidate afterglow
  3. GRB 070311: a long GRB detected by INTEGRAL
  4. GRB060901: Candidate optical afterglow
  5. GRB070309: Swift/XRT possible afterglow detection
  6. GRB 070125: Chandra X-ray Confirmation of Jet Break
  7. GRB 070306, optical observation
  8. GRB 070309: A long GRB detected by INTEGRAL
  9. GRB 070125: X-ray light curve analysis
  10. GRB 070306: NOT observations
  11. GRB 070306 Swift/UVOT refined analysis
  12. GRB070306: confirmation of near infrared afterglow
  13. GRB 070306: ART-3 early optical and near infrared constraints
  14. GRB 070306: IR observations and candidate afterglow
  15. GRB 070306, Swift-BAT refined analysis
  16. GRB 070306: XRT Team Refined Analysis
  17. GRB 070306: Optical and IR observations with KANATA
  18. GRB070306 - SDSS Pre-burst Observations
  19. GRB 070306: Swift detection of a burst
  20. GRB 070223: NIR observations at WHT
  21. GRB070227: Swift-XRT refined analysis
  22. GRB 060605 new redshift
  23. GRB 070125, deep late-time optical observation
  24. GRB 070227: optical observations
  25. GRB 070223: Optical Observations
  26. GRB 070227: optical observations
  27. GRB 070227: Swift/UVOT Upper Limits
  28. GRB 070227: TAROT La Silla observatory optical observations
  29. GRB 070227, Swift-BAT refined analysis
  30. GRB070227: possible X-ray afterglow detection
  31. GRB 070227: Swift detection of a burst in ground analysis
  32. GRB 920925C: optical afterglow candidate
  33. GRB 070224: Optical afterglow confirmation
  34. GRB070224: Swift-XRT Astrometrically Corrected Position
  35. GRB070224: Magellan Imaging Observations
  36. GRB 070224: WHT K-band imaging
  37. GRB 070224: MDM Observations
  38. GRB070224: Gemini Imaging Observations
  39. GRB070224: Swift-XRT Refined Analysis
  40. GRB 070224: optical afterglow candidate
  41. GRB 070224, Swift-BAT refined analysis
  42. GRB 070224: Swift detection of a burst
  43. GRB 070223: Optical observations
  44. RHESSI Spectrum of GRB070220
  45. GRB070223: Swift/UVOT refined analysis
  46. GRB 070223: Optical-IR observation with KANATA
  47. GRB 070223, Swift-BAT refined analysis
  48. GRB 070223: Swift-XRT Refined Analysis
  49. GRB070223 - SDSS Pre-Burst Observations
  50. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  51. GRB 070223: MDM Observations
  52. GRB070223: Swift burst
  53. Konus-Wind and Konus-A observations of GRB 070220
  54. GRB 070220: MITSuME Okayama Optical Observation
  55. GRB 070220: ART-3 Optical and NIR limits
  56. GRB 070220 Swift-BAT Refined Analysis
  57. Swift/UVOT refined analysis of GRB070220
  58. GRB 070209: Swift XRT refined analysis
  59. GRB 070220: Swift-XRT Refined Analysis
  60. GRB 070220: Observation with the KANATA 1.5m telescope
  61. GRB 070219: Gemini Observations
  62. GRB 070220 : Faulkes Telescope North optical limit
  63. GRB 070220: Swift detection of a burst
  64. GRB 070219: XRT Refined Analysis
  65. GRB 070219: I-band observations
  66. GRB 070219, Swift-BAT refined analysis
  67. GRB 070219: optical TNG observations
  68. GRB 070219: Liverpool Telescope Observations
  69. GRB 070219: ROTSE-III Optical Limits
  70. GRB070219 - SDSS Pre-Burst Observations
  71. GRB 070219: Swift detection of a burst
  72. GRB 070125 observations with the GMRT
  73. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  74. GRB 060927: PROMPT Observations
  75. GRB 070129: MDM I-band Detection
  76. GRB 070125: Break in Optical Decay
  77. GRB 070209: Swift XRT analysis
  78. GRB 070201: clarification on localization and Konus-Wind spectra
  79. GRB070208: optical observations
  80. GRB 070201: Proximity of IPN annulus to M31
  81. GRB 070208: MARGE Optical Observations
  82. IPN localization of very bright long hard GRB 070207
  83. IPN localization of very intense short GRB 070201
  84. GRB 070209, Swift-BAT refined analysis of the short hard burst
  85. GRB 070209: Swift detection of a short hard burst
  86. GRB 070208: Swift XRT refined analysis
  87. GRB 070208: RAPTOR detection of early afterglow onset
  88. GRB070208: Absorption and emission redshift from Gemini
  89. GRB 070208: MDM Optical Decay
  90. GRB 070208, Swift-BAT refined analysis
  91. GRB070208 - SDSS Pre-Burst Observations
  92. GRB 070208: Early IR detection and afterglow astrometry
  93. GRB 070208: Afterglow confirmation from P60
  94. GRB 070208: ROTSE-III Optical Limits
  95. GRB 070208: MDM Observations
  96. GRB 070208: Swift detection of a burst
  97. GRB 070125 detection with CARMA
  98. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  99. GRB 070129: afterglow confirmation
  100. GRB070124: Swift-XRT Follow-up Observation

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