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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"

32570 results found.

  1. GRB 070311: RAPTOR Detection of Optical Emission
  2. GRB070311: FRAM early follow-up limit
  3. GRB 070311: P60 Observations
  4. GRB 070311: MDM Optical Detection
  5. GRB 070311: Swift/UVOT Upper Limits
  6. GRB 070311: MITSuME Okayama Optical Observation
  7. GRB 070311: Swift-XRT refined analysis
  8. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  9. GRB 070311: REM candidate afterglow
  10. GRB060901: Candidate optical afterglow
  11. GRB070309: Swift/XRT possible afterglow detection
  12. GRB 070125: Chandra X-ray Confirmation of Jet Break
  13. GRB 070309: Swift/UVOT Upper Limits
  14. GRB 070306, optical observation
  15. Swift UVOT Finding Charts for GRB 070309
  16. GRB 070125: X-ray light curve analysis
  17. VLA observation of GRB 070306
  18. GRB 070306: NOT observations
  19. GRB 070306 Swift/UVOT refined analysis
  20. GRB070306: confirmation of near infrared afterglow
  21. GRB 070306: ART-3 early optical and near infrared constraints
  22. GRB 070306, Swift-BAT refined analysis
  23. GRB 070306: XRT Team Refined Analysis
  24. GRB 070306: Optical and IR observations with KANATA
  25. GRB 070223: NIR observations at WHT
  26. GRB070227: Swift-XRT refined analysis
  27. GRB 060605 new redshift
  28. GRB 070125, deep late-time optical observation
  29. VLA observation of GRB 070224
  30. GRB 070223: Optical Observations
  31. GRB 070227: optical observations
  32. GRB 070227: Swift/UVOT Upper Limits
  33. GRB 070227, Swift-BAT refined analysis
  34. GRB070227: possible X-ray afterglow detection
  35. GRB 070224: Optical afterglow confirmation
  36. GRB 070224: Swift/UVOT Upper Limits
  37. GRB070224: Swift-XRT Astrometrically Corrected Position
  38. VLA observation of GRB 070223
  39. VLA observation of GRB 070220
  40. GRB070224: Magellan Imaging Observations
  41. GRB 070224: WHT K-band imaging
  42. GRB 070224: MDM Observations
  43. GRB070224: Gemini Imaging Observations
  44. GRB070224: Swift-XRT Refined Analysis
  45. GRB 070224: optical afterglow candidate
  46. GRB 070224, Swift-BAT refined analysis
  47. GRB 070224: MASTER-Net refind analysis
  48. GRB 070224: MASTER-VWF-Kislovodsk observations
  49. GRB 070223: Optical observations
  50. RHESSI Spectrum of GRB070220
  51. GRB070223: Swift/UVOT refined analysis
  52. GRB 070223: Optical-IR observation with KANATA
  53. GRB 070223, Swift-BAT refined analysis
  54. GRB070223: MASTER-VWF-Kislovodsk observations
  55. GRB 070223: Swift-XRT Refined Analysis
  56. GRB070223 - SDSS Pre-Burst Observations
  57. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  58. GRB 070223: MDM Observations
  59. Konus-Wind and Konus-A observations of GRB 070220
  60. GRB 070220: MITSuME Okayama Optical Observation
  61. GRB 070220: ART-3 Optical and NIR limits
  62. GRB 070220 Swift-BAT Refined Analysis
  63. Swift/UVOT refined analysis of GRB070220
  64. GRB 070209: Swift XRT refined analysis
  65. GRB 070220: Swift-XRT Refined Analysis
  66. GRB 070220: Observation with the KANATA 1.5m telescope
  67. GRB 070219: Gemini Observations
  68. GRB 070220 : Faulkes Telescope North optical limit
  69. GRB070219: MASTER-VWF-Kislovodsk observations
  70. GRB 070219: XRT Refined Analysis
  71. GRB 070219: Swift/UVOT Upper limits
  72. GRB 070219: I-band observations
  73. GRB 070219, Swift-BAT refined analysis
  74. GRB 070219: optical TNG observations
  75. GRB 070219: Liverpool Telescope Observations
  76. GRB 070219: ROTSE-III Optical Limits
  77. IPN triangulation of GRB070201 (refined error box using MESSENGER data)
  78. GRB 070125 observations with the GMRT
  79. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  80. GRB 060927: PROMPT Observations
  81. GRB 070201: Correction to GCN 6094
  82. GRB 070125: Break in Optical Decay
  83. GRB 070209: Swift XRT analysis
  84. GRB 070201: clarification on localization and Konus-Wind spectra
  85. GRB070208: optical observations
  86. GRB 070201: IPN constraints and nearby galaxies
  87. GRB 070201: Proximity of IPN annulus to M31
  88. GRB 070208: MARGE Optical Observations
  89. GRB 070209, Swift-BAT refined analysis of the short hard burst
  90. GRB 070208: Swift XRT refined analysis
  91. GRB 070208: RAPTOR detection of early afterglow onset
  92. GRB070208: Absorption and emission redshift from Gemini
  93. GRB 070208: MDM Optical Decay
  94. GRB 070208, Swift-BAT refined analysis
  95. GRB070208 - SDSS Pre-Burst Observations
  96. GRB 070208: Early IR detection and afterglow astrometry
  97. GRB 070208: Afterglow confirmation from P60
  98. GRB070208: Faulkes Telescope North Afterglow Identification
  99. GRB 070208: ROTSE-III Optical Limits
  100. GRB 070208: MDM Observations

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