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"

42902 results found.

  1. GRB060218: Swift/XRT refined position of a possible burst
  2. Preliminary refined analysis of the Swift-BAT trigger 191157
  3. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  4. GRB060218 : SDSS pre-burst observations
  5. GRB 060218: Swift XRT Position
  6. GRB 060218: Swift-BAT detection of a possible burst
  7. GRB 060213: optical afterglow not confirmed
  8. GRB 060211B: Skynet Observations
  9. GRB 060213: optical afterglow candidate
  10. GRB060213: Swift XRT observations and possible afterglow candidate
  11. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  12. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  13. GRB060213: MASTER final result
  14. GRB 060211b: WIRO NIR Observations
  15. GRB060213:_MASTER_optical_observation
  16. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  17. Konus-Wind observation of bright hard GRB 060213
  18. GRB 060213: IPN localization
  19. GRB 060210: Radio Observations
  20. GRB 060211a: WIRO NIR Observations
  21. GRB060211B: REM optical and NIR observations
  22. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  23. GRB 060211A: Further refined analysis of the Swift burst
  24. GRB060121: optical observations
  25. GRB060110: optical observations
  26. GRB060105: optical observations
  27. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  28. GRB 060211b: P60 Observations
  29. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  30. GRB 060206: SOAR Detections
  31. GRB 050826: Optical Afterglow and Host Galaxy
  32. GRB 060210: Further refined analysis of the Swift-BAT burst
  33. GRB 060211B: Swift/BAT refined analysis
  34. GRB060210: Swift/UVOT Upper Limits
  35. GRB 060211B: Swift-XRT Team refined analysis
  36. GRB060211b: optical observation
  37. GRB060211B: Swift/XRT position
  38. GRB 060210: Optical Observations
  39. GRB 060211A: Swift XRT Team Refined Analysis
  40. GRB 060211B: Swift-BAT detection of a burst
  41. GRB060211: Faulkes North observation
  42. GRB 060211: Swift detection of a long burst
  43. GRB 060210: Refined analysis of the Swift-BAT burst
  44. GRB060210: Swift XRT Refined Analysis
  45. GRB060206, optical observations
  46. GRB060210: Optical Observations
  47. GRB060210: Gemini absorption spectroscopy
  48. GRB060210: Early Optical Observations
  49. GRB 060210: optical evolution
  50. GRB060210:Faulkes Telescope North Afterglow Confirmation
  51. GRB 060210: Swift detection of a burst
  52. GRB060210: Optical afterglow
  53. GRB 060206: Swift/UVOT Observations
  54. Swift-BAT trigger 180931 is not a GRB
  55. GRB060209: RTT150 optical observations
  56. GRB 060209 : TAROT optical observation
  57. GRB 060209(?): Swift-BAT detection of a possible burst
  58. GRB 060206: WSRT Radio Observations
  59. GRB 060203: Swift/UVOT upper limits
  60. GRB 060206: TTT Observations
  61. GRB 060206: More PROMPT Detections
  62. GRB 060121 : WIDGET Pre-trigger limit
  63. GRB 060206: Tenagra II Observations
  64. GRB 060206: PROMPT Detections
  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. GRB060206: SDSS Pre-Burst Observations
  77. GRB060206: Swift XRT Refined Analysis
  78. GRB060206: Liverpool Telescope observation
  79. GRB 060206: Spectroscopic Redshift
  80. GRB060206: P60 Optical Observations
  81. GRB 060206: KAIT observations
  82. GRB060206: Swift XRT Position
  83. GRB060206: SARA Detection
  84. GRB 060206: RAPTOR observations of afterglow candidate variability.
  85. GRB 060206: High redshift burst
  86. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  87. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  88. GRB060206: Optical afterglow
  89. GRB060206: Swift-BAT detection of a burst
  90. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  91. GRB060203: WHT Z-band observations
  92. BAT GRB 060204C is probably not a GRB
  93. GRB060204C: optical observation
  94. GRB 060204B: BVRi-band detections of optical afterglow
  95. GRB 060204A: Swift XRT upper limit
  96. GRB060204B: Swift/UVOT refined analysis
  97. GRB 060204C: optical observations
  98. Swift XRT Observation of GRB 060204C
  99. GRB 060204B: Swift-BAT refined analysis
  100. GRB 060204B: ART early limit

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