Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

26316 results found.

  1. GRB 051221B: Refined analysis of the Swift-BAT burst
  2. GRB 051221B: BOOTES optical observations.
  3. Swift-BAT detection of a possible burst
  4. GRB 051221: Swift XRT refined analysis
  5. GRB 051221: Swift/UVOT upper limits
  6. GRB 051221: No variability in Gemini data
  7. GRB 051221: Improved astrometry of the IR counterpart
  8. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  9. GRB 051221: Swift detection of a bright short burst
  10. Swift detection of an RS CVn flare star
  11. GRB051211A: possible optical candidate
  12. GRB 051215: near-infrared observations
  13. GRB051215 - SDSS pre-burst observations
  14. GRB 051215: Swift detection of a possible burst
  15. GRB051105: optical observations
  16. GRB 051213: Swift-BAT refined analysis
  17. GRB051211B: XRT refined analysis
  18. GRB 051211B, optical observation
  19. GRB 051211A: Swift/UVOT upper limits
  20. GRB 051211B: Swift/UVOT upper limits
  21. GRB 051211A,optical observation
  22. GRB051211B: Liverpool Telescope observation
  23. GRB051211b: P60 Observations
  24. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  25. GRB 051210: Swift/UVOT upper limits
  26. GRB 051210: Magellan Imaging
  27. GRB 051211: TAROT optical limits
  28. GRB 051211B: a possible optical detection by TAROT
  29. GRB 051211:IAC80 optical observations
  30. GRB 051210: SALT detection limit
  31. GRB 051210: Swift XRT refined analysis
  32. GRB 051210: FRAM early limit
  33. GRB 051210: Swift-BAT refined analysis of a short burst
  34. GRB051210: Swift UVOT Observation
  35. GRB 051210: Swift detection of a burst
  36. An extraordinary long burst on December 3 from SGR1806-20
  37. Possible resuming of the SGR 1806-20 activity
  38. GRB051117B: Swift XRT refined analysis
  39. GRB051117b: No Swift/UVOT Detection
  40. GRB 051117A: Swift/UVOT Detection of an Afterglow: Correction
  41. GRB 051117A: Swift/UVOT Detection of an Afterglow
  42. GRB051111: Suzaku WAM observation of the prompt emission
  43. GRB051008: Suzaku WAM observation of the prompt emission
  44. GRB 051117B: R and I observations of possible host galaxy
  45. GRB 051117A: Refined analysis of the Swift-BAT burst
  46. GRB 051117B: Refined analysis of the Swift-BAT burst
  47. GRB 051117B,optical observation
  48. GRB 051117B: Lulin R and I band observation
  49. GRB051114: results of the Swift-XRT observation
  50. GRB 051109B : Nainital upper limits
  51. GRB 051114: Radio Observations
  52. GRB 051114: Swift-BAT refined analysis
  53. GRB050925: analysis of the XMM-Newton observation
  54. GRB 051114: Swift-BAT detection of a short burst
  55. GRB 051111: Further spectroscopic analysis
  56. GRB 051111: Radio afterglow
  57. GRB 051113: Swift-BAT refined analysis
  58. GRB051103: Radio Observations
  59. GRB/SGR 050925: XMM-Newton ToO observation
  60. GRB051111: Swift/UVOT Observations
  61. GRB051111: XRT preliminary analysis
  62. GRB 051111: Swift-BAT refined analysis
  63. GRB 051109A Optical Observations
  64. GRB 051111A : Lulin BVRI multi band afterglow observation
  65. GRB051111a: SARA Observations
  66. GRB 051111a: IR photometry
  67. GRB 051109B. Radio Observations
  68. GRB 051109A
  69. GRB051109A - radio observations
  70. GRB 051109B: Swift-BAT refined analysis
  71. GRB 051109A: Swift-UVOT Observations
  72. IPN triangulation and Konus spectrum of the short/soft GRB051107 (large
  73. GRB051109B: no UVOT source detected
  74. GRB051109B: XRT refined analysis
  75. GRB 051109B : Lulin Optical Observations
  76. GRB 051109A : Lulin BVRI Optical afterglow observation
  77. GRB051109A: further steepening in the X-ray light curve
  78. GRB051109A: XRT refined analysis
  79. GRB 051109B: Super-LOTIS Observations
  80. GRB051105B: REM Optical observation
  81. GRB 051109B: Swift detection of a burst
  82. GRB 051109: Rc and Ic observations
  83. GRB 051109: Swift-BAT refined analysis
  84. GRB 051109a: IR Photometry and Astrometry
  85. GRB051109: Swift detection of a burst
  86. GRB 051109a: IR Detections
  87. GRB051105B: Swift/XRT upper limit
  88. GRB051105B: Swift/UVOT upper limit
  89. GRB051103: MASTER: OT limit and host galaxy candidates
  90. GRB051028: Swift-XRT refined analysis
  91. GRB 051105a, observation from Naini Tal and OSN
  92. GRB 051105a: MDM Observations
  93. GRB 051105A: TNG optical observations
  94. GRB051105A: Swift/UVOT Observations
  95. GRB 051105A, radio observations
  96. GRB051103:_MASTER_optical_observations
  97. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  98. GRB 051105A, optical observations
  99. XRT observations of GRB 051105A
  100. GRB 051105b: ART optical limits

Advanced

Download all Circulars as a .tar.gz archive:
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