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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"

26054 results found.

  1. GRB 070306: ART-3 early optical and near infrared constraints
  2. GRB 070306: IR observations and candidate afterglow
  3. GRB 070306, Swift-BAT refined analysis
  4. GRB 070306: XRT Team Refined Analysis
  5. GRB 070306: Optical and IR observations with KANATA
  6. GRB070306 - SDSS Pre-burst Observations
  7. GRB 070306: Swift detection of a burst
  8. GRB 070223: NIR observations at WHT
  9. GRB070227: Swift-XRT refined analysis
  10. GRB 060605 new redshift
  11. GRB 070125, deep late-time optical observation
  12. VLA observation of GRB 070224
  13. GRB 070227: optical observations
  14. GRB 070223: Optical Observations
  15. GRB 070227: optical observations
  16. GRB 070227: Swift/UVOT Upper Limits
  17. GRB 070227: TAROT La Silla observatory optical observations
  18. GRB 070227, Swift-BAT refined analysis
  19. GRB070227: possible X-ray afterglow detection
  20. GRB 070227: Swift detection of a burst in ground analysis
  21. GRB 920925C: optical afterglow candidate
  22. GRB 070224: Optical afterglow confirmation
  23. GRB 070224: Swift/UVOT Upper Limits
  24. GRB070224: Swift-XRT Astrometrically Corrected Position
  25. VLA observation of GRB 070223
  26. VLA observation of GRB 070220
  27. GRB070224: Magellan Imaging Observations
  28. GRB 070224: WHT K-band imaging
  29. GRB070224: Gemini Imaging Observations
  30. GRB 070224: SARA upper limit
  31. GRB070224: Swift-XRT Refined Analysis
  32. GRB 070224: optical afterglow candidate
  33. GRB 070224, Swift-BAT refined analysis
  34. GRB 070224: MASTER-Net refind analysis
  35. GRB 070224: MASTER-VWF-Kislovodsk observations
  36. GRB 070224: Swift detection of a burst
  37. GRB 070223: Optical observations
  38. GRB070223: Swift/UVOT refined analysis
  39. GRB 070223: Optical-IR observation with KANATA
  40. GRB 070223, Swift-BAT refined analysis
  41. GRB070223: MASTER-VWF-Kislovodsk observations
  42. GRB 070223: Swift-XRT Refined Analysis
  43. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  44. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  45. GRB 070223: MDM Observations
  46. GRB070223: Swift burst
  47. Konus-Wind and Konus-A observations of GRB 070220
  48. GRB 070220: MITSuME Okayama Optical Observation
  49. GRB 070220: ART-3 Optical and NIR limits
  50. GRB 070220 Swift-BAT Refined Analysis
  51. Swift/UVOT refined analysis of GRB070220
  52. GRB 070209: Swift XRT refined analysis
  53. GRB 070220: Swift-XRT Refined Analysis
  54. GRB 070220: Observation with the KANATA 1.5m telescope
  55. GRB 070219: Gemini Observations
  56. GRB 070220 : Faulkes Telescope North optical limit
  57. GRB 070220: Swift detection of a burst
  58. GRB070219: MASTER-VWF-Kislovodsk observations
  59. GRB 070219: XRT Refined Analysis
  60. GRB 070219: Swift/UVOT Upper limits
  61. GRB 070219: I-band observations
  62. GRB 070219, Swift-BAT refined analysis
  63. GRB 070219: optical TNG observations
  64. GRB 070219: Liverpool Telescope Observations
  65. GRB 070219: ROTSE-III Optical Limits
  66. GRB070219 - SDSS Pre-Burst Observations
  67. GRB 070219: Swift detection of a burst
  68. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  69. Swift-BAT trigger 260304 is NOT a burst or transient
  70. GRB 060927: PROMPT Observations
  71. GRB 070125: Break in Optical Decay
  72. GRB 070209: Swift XRT analysis
  73. GRB 070208: MARGE Optical Observations
  74. IPN localization of very bright long hard GRB 070207
  75. IPN localization of very intense short GRB 070201
  76. GRB 070209, Swift-BAT refined analysis of the short hard burst
  77. GRB 070209: Swift detection of a short hard burst
  78. GRB 070208: Swift XRT refined analysis
  79. GRB 070208: RAPTOR detection of early afterglow onset
  80. GRB070208: Absorption and emission redshift from Gemini
  81. GRB 070208: MDM Optical Decay
  82. GRB 070208, Swift-BAT refined analysis
  83. GRB 070208: Early IR detection and afterglow astrometry
  84. GRB 070208: Afterglow confirmation from P60
  85. GRB070208: Faulkes Telescope North Afterglow Identification
  86. GRB 070208: ROTSE-III Optical Limits
  87. GRB 070208: MDM Observations
  88. GRB 070208: Swift detection of a burst
  89. GRB 070125 detection with CARMA
  90. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  91. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  92. GRB 070129: afterglow confirmation
  93. GRB070124: Swift-XRT Follow-up Observation
  94. GRB070126: Swift-XRT Observation
  95. GRB 070129: Swift/UVOT Upper limits
  96. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  97. GRB 070125: optical observation
  98. GRB 070125: WSRT Radio Detection
  99. GRB070129: MITSuME optical observation
  100. GRB061217: MAGIC telescope GeV observation

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