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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

37522 results found.

  1. GRB060218 : SDSS pre-burst observations
  2. GRB 060218: Swift XRT Position
  3. GRB 060218: Swift-BAT detection of a possible burst
  4. GRB 060213: optical afterglow not confirmed
  5. Swift UVOT observations of GRB060213
  6. GRB 060211B: Skynet Observations
  7. GRB 060213: optical afterglow candidate
  8. GRB060213: Swift XRT observations and possible afterglow candidate
  9. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  10. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  11. GRB060213: MASTER final result
  12. GRB 060211b: WIRO NIR Observations
  13. GRB060213:_MASTER_optical_observation
  14. Konus-Wind observation of bright hard GRB 060213
  15. GRB 060213: IPN localization
  16. GRB 060210: Radio Observations
  17. GRB 060211a: WIRO NIR Observations
  18. GRB060211B: REM optical and NIR observations
  19. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  20. GRB 060211A: Further refined analysis of the Swift burst
  21. GRB060121: optical observations
  22. GRB060110: optical observations
  23. GRB060105: optical observations
  24. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  25. GRB 060211b: P60 Observations
  26. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  27. GRB 060206: SOAR Detections
  28. GRB 050826: Optical Afterglow and Host Galaxy
  29. GRB 060210: Further refined analysis of the Swift-BAT burst
  30. GRB 060211B: Swift/BAT refined analysis
  31. GRB060210: Swift/UVOT Upper Limits
  32. GRB 060211B: Swift-XRT Team refined analysis
  33. GRB060211b: optical observation
  34. GRB 060210: Optical Observations
  35. GRB060211.7: MASTER_optical_observation under the snow
  36. GRB 060211A: Swift XRT Team Refined Analysis
  37. GRB 060211B: Swift-BAT detection of a burst
  38. GRB060211: Faulkes North observation
  39. GRB 060211: ROTSE-III Optical Limits
  40. GRB 060211: Swift detection of a long burst
  41. GRB 060210: Refined analysis of the Swift-BAT burst
  42. GRB060210: Swift XRT Refined Analysis
  43. GRB060206, optical observations
  44. GRB 060210 : Xinglong and Lulin optical limit
  45. GRB060210: Gemini absorption spectroscopy
  46. GRB 060210: optical evolution
  47. GRB060210:Faulkes Telescope North Afterglow Confirmation
  48. GRB 060210: candidate afterglow
  49. GRB 060210: Swift detection of a burst
  50. GRB 060206: Swift/UVOT Observations
  51. Swift-BAT trigger 180931 is not a GRB
  52. GRB060209: RTT150 optical observations
  53. GRB 060209 : TAROT optical observation
  54. GRB060209A: MASTER optical observation
  55. GRB 060209(?): Swift-BAT detection of a possible burst
  56. GRB 060206: near-infrared observations (JK' imaging)
  57. GRB 060206: WSRT Radio Observations
  58. GRB 060203: Swift/UVOT upper limits
  59. GRB 060206: TTT Observations
  60. GRB 060206: More PROMPT Detections
  61. GRB 060121 : WIDGET Pre-trigger limit
  62. GRB 060206: Tenagra II Observations
  63. GRB 060206: PROMPT Detections
  64. Retraction of orphan GRB afterglow candidate
  65. GRB060204a: Swift XRT Source is not GRB Afterglow
  66. GRB 060206: optical observations at Asiago
  67. Orphan GRB Afterglow candidate
  68. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  69. GRB 060206: Subaru/FOCAS optical spectroscopy
  70. GRB 060206: IR Detection of the Afterglow
  71. GRB 060206: Lick 3m Spectroscopy
  72. GRB 060204A: ROSAT Pointing
  73. GRB 060206: Super-LOTIS observations
  74. GRB060204A: Swift/UVOT observations
  75. GRB 060206: Swift-BAT refined analysis
  76. GRB 060206 : Lulin optical observations
  77. GRB060206: SDSS Pre-Burst Observations
  78. GRB060206: Swift XRT Refined Analysis
  79. GRB060206: Liverpool Telescope observation
  80. GRB 060206: Spectroscopic Redshift
  81. GRB060206: P60 Optical Observations
  82. GRB 060206: KAIT observations
  83. GRB060206: Swift XRT Position
  84. GRB060206: SARA Detection
  85. GRB 060206: RAPTOR observations of afterglow candidate variability.
  86. GRB 060206: High redshift burst
  87. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  88. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  89. BAT GRB 060204C is probably not a GRB
  90. GRB060204C: optical observation
  91. GRB 060204B: BVRi-band detections of optical afterglow
  92. GRB 060204A: Swift XRT upper limit
  93. GRB 060204A: FRAM optical observations
  94. GRB060204B: Swift/UVOT refined analysis
  95. GRB 060204C: optical observations
  96. Swift XRT Observation of GRB 060204C
  97. GRB 060204B: Swift-BAT refined analysis
  98. GRB 060204B: ART early limit
  99. GRB060204B: Swift XRT Team Refined Analysis
  100. GRB 060204C: OSN limits

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