Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

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"

41951 results found.

  1. GRB 060218: spectroscopic observations
  2. GRB 060218: Likely an underluminous GRB
  3. GRB060218: Optical Spectroscopy of GRB-SN
  4. GRB060218: VLT spectroscopy
  5. GRB 060218: Optical Observations at Xinglong Obs.
  6. GRB 060219: SDSS galaxy inside XRT error circle
  7. GRB060218: UV Detection and Light Curves
  8. GRB060219: SARA Observations
  9. GRB 060219: Swift-XRT Team refined analysis
  10. GRB 051221B: Swift-XRT Team Refined Analysis
  11. GRB060218: Radio Afterglow Discovery
  12. GRB 060218: optical/nIR observations at La Palma
  13. GRB060219: SDSS pre-burst observations
  14. GRB 060219: Swift-BAT detection of a weak burst
  15. Oddball GRB 060218, transient or GRB?
  16. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  17. Brightening of the Optical Counterpart of the Possible GRB 060218
  18. GRB 060218: MDM Observations
  19. GRB 060218: Pre-burst detection of a possible host galaxy
  20. GRB 060218A: ROTSE-III Possible Optical Flare
  21. GRB060218: Swift/XRT refined position of a possible burst
  22. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  23. GRB060218 : SDSS pre-burst observations
  24. GRB 060218: Swift-BAT detection of a possible burst
  25. GRB 060213: optical afterglow not confirmed
  26. Swift UVOT observations of GRB060213
  27. GRB 060211B: Skynet Observations
  28. GRB 060213: optical afterglow candidate
  29. GRB060213: Swift XRT observations and possible afterglow candidate
  30. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  31. GRB 060211b: WIRO NIR Observations
  32. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  33. Konus-Wind observation of bright hard GRB 060213
  34. GRB 060213: IPN localization
  35. GRB 060210: Radio Observations
  36. GRB 060211a: WIRO NIR Observations
  37. GRB060211B: REM optical and NIR observations
  38. GRB 060211A: Further refined analysis of the Swift burst
  39. GRB060121: optical observations
  40. GRB060110: optical observations
  41. GRB060105: optical observations
  42. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  43. GRB 060211b: P60 Observations
  44. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  45. GRB 060206: SOAR Detections
  46. GRB 050826: Optical Afterglow and Host Galaxy
  47. GRB 060210: Further refined analysis of the Swift-BAT burst
  48. GRB 060211B: Swift/BAT refined analysis
  49. GRB060210: Swift/UVOT Upper Limits
  50. GRB 060211B: Swift-XRT Team refined analysis
  51. GRB060211b: optical observation
  52. GRB060211B: Swift/XRT position
  53. GRB 060210: Optical Observations
  54. GRB 060211A: Swift XRT Team Refined Analysis
  55. GRB 060211B: Swift-BAT detection of a burst
  56. GRB060211: Faulkes North observation
  57. GRB 060211: Swift detection of a long burst
  58. GRB 060210: Refined analysis of the Swift-BAT burst
  59. GRB060210: Swift XRT Refined Analysis
  60. GRB060206, optical observations
  61. GRB 060210 : Xinglong and Lulin optical limit
  62. GRB060210: Optical Observations
  63. GRB060210: Gemini absorption spectroscopy
  64. GRB060210: Early Optical Observations
  65. GRB 060210: optical evolution
  66. GRB060210:Faulkes Telescope North Afterglow Confirmation
  67. GRB 060210: candidate afterglow
  68. GRB 060210: Swift detection of a burst
  69. GRB060210: Optical afterglow
  70. GRB 060206: Swift/UVOT Observations
  71. GRB060209: RTT150 optical observations
  72. GRB 060209 : TAROT optical observation
  73. GRB 060209(?): Swift-BAT detection of a possible burst
  74. GRB 060206: near-infrared observations (JK' imaging)
  75. GRB 060206: WSRT Radio Observations
  76. GRB 060206: TTT Observations
  77. GRB 060206: More PROMPT Detections
  78. GRB 060121 : WIDGET Pre-trigger limit
  79. GRB 060206: Tenagra II Observations
  80. GRB 060206: PROMPT Detections
  81. GRB060204a: Swift XRT Source is not GRB Afterglow
  82. GRB 060206: optical observations at Asiago
  83. Orphan GRB Afterglow candidate
  84. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  85. GRB 060206: Subaru/FOCAS optical spectroscopy
  86. GRB 060206: IR Detection of the Afterglow
  87. GRB 060206: Lick 3m Spectroscopy
  88. GRB 060204A: ROSAT Pointing
  89. GRB 060206: Super-LOTIS observations
  90. GRB060204A: Swift/UVOT observations
  91. GRB 060206: Swift-BAT refined analysis
  92. GRB 060206 : Lulin optical observations
  93. GRB060206: SDSS Pre-Burst Observations
  94. GRB060206: Swift XRT Refined Analysis
  95. GRB060206: Liverpool Telescope observation
  96. GRB060206: P60 Optical Observations
  97. GRB 060206: KAIT observations
  98. GRB060206: Swift XRT Position
  99. GRB060206: SARA Detection
  100. GRB 060206: RAPTOR observations of afterglow candidate variability.

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov