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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"

43672 results found.

  1. GRB 060114: REM observations
  2. GRB 060115: Swift XRT refined analysis
  3. GRB060115, optical observation
  4. GRB 060115: MITSuME optical afterglow candidate
  5. GRB 060115: Swift detection of a burst
  6. GRB 060114: Swift XRT upper limit
  7. GRB060114, optical observation
  8. GRB 060114: A long GRB detected by INTEGRAL
  9. GRB060114: Faulkes North observation
  10. GRB 060108: IR observations of afterglow
  11. GRB060108: Faulkes North afterglow evidence
  12. GRB 060108: Evidence for an XRT Position Offset
  13. GRB 060110: KAIT observations
  14. GRB 060111B: Swift XRT refined analysis
  15. GRB 060111A: refined UVOT anaysis
  16. GRB 060111B: MITSuME detection of optical afterglow
  17. GRB 060111B: TAROT optical observation
  18. GRB060111A: RTT150 optical observations
  19. GRB060111B: RTT150, possible host galaxy
  20. GRB 060111B: Refined analysis of the Swift-BAT burst
  21. GRB 060110: MARGE observations
  22. GRB 060111(a): P60 Observations
  23. GRB 060111B: Gualba observatory limit
  24. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  25. GRB 060111B: Swift detection of a burst
  26. GRB 060111: Swift-BAT Refined Analysis
  27. GRB060111.2:_MASTER optical limit
  28. GRB 060108: VLT K-band observations
  29. GRB 060111: TAROT optical observation
  30. GRB 060111: possible UVOT counterpart
  31. GRB060111 : XRT refined analysis
  32. GRB 060111: ROTSE-III Optical Limits
  33. GRB 060111: Swift detection of a burst
  34. GRB 060110: Swift-BAT refined analysis
  35. GRB 060109: Swift-BAT refined analysis
  36. GRB 060108: z-band imaging from Gemini-North
  37. GRB 060110a: RAPTOR detection of early optical emission.
  38. GRB 060110: UKIRT K-band observations
  39. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  40. GRB 060110: IR Candidate Afterglow
  41. GRB060110, optical observation
  42. GRB 060110: Super-LOTIS observations
  43. GRB 060110: Optical observation
  44. GRB 060110: Correction
  45. GRB 050110: IR Observations
  46. GRB 060110: Optical limit
  47. GRB 060110: Swift-BAT detection of a burst
  48. GRB 060109: Refined Swift-XRT analysis
  49. GRB 060109: Swift/UVOT upper limits
  50. GRB060109, optical observation
  51. GRB 060108: ISAS early observations and near IR upper limit
  52. GRB060108: P200 Ks Observations
  53. GRB 060108: early UKIRT K-band observations
  54. Swift UVOT correction to GCN 4455
  55. GRB 060109: Swift Detection of a long burst
  56. GRB 060108: a dark burst?
  57. GRB 060108: Refined XRT analysis
  58. GRB 060108: VLT J-band observations
  59. GRB 060108: Swift/UVOT upper limits
  60. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  61. GRB060108: SDSS pre-burst observations
  62. GRB060108: Faulkes Telescope observation
  63. GRB 060108: Refined analysis of the Swift-BAT burst
  64. GRB 060108: Swift XRT position
  65. GRB060108: Swift detection of its 100th GRB
  66. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  67. GRB 060105: Radio observations
  68. GRB 060105: MDM Observation
  69. Konus-Wind observation of GRB 060105
  70. GRB 060105: Swift/UVOT upper limits
  71. GRB 060105: BAT refined analysis
  72. GRB 060102 - no XRT afterglow
  73. GRB 060105: XRT refined analysis
  74. GRB060105, optical observation
  75. GRB060105: Swift detection of a bright long burst
  76. Swift-BAT trigger 175653 is not an astrophysical source
  77. GRB 060102: MDM Observation
  78. Swift-BAT trigger 175653 is probably not a GRB
  79. GRB 060102: Swift-BAT refined analysis
  80. Time Correction to GRB 060102
  81. GRB 060102: Swift-BAT detection of a burst
  82. GRB051211B: optical observations
  83. GRB051227: SARA Observations
  84. GRB 051221B: Optical Observations with Kuiper 1.54m
  85. GRB 051227: Likely host galaxy underlying afterglow position
  86. GRB 051227: optical observation
  87. GRB051221B: Radio observations
  88. GRB 051221A: VLA Radio Observations
  89. GRB051227: Radio Observations
  90. GRB 051227: Confirmed fading from Gemini observations
  91. GRB051227: further analysis of VLT images
  92. GRB 051227: optical afterglow
  93. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  94. GRB 051227: Gemini observations
  95. GRB 051227: Keck Spectroscopy
  96. GRB 051227: Magellan r'-band Imaging/Astrometry
  97. GRB 051227: refined analysis of VLT images
  98. GRB 051227: P60 Observations
  99. GRB 051227: MDM Observation
  100. GRB 051227: R-band object in the XRT error circle

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