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"

26481 results found.

  1. GRB 060111: Swift-BAT Refined Analysis
  2. GRB060111.2:_MASTER optical limit
  3. GRB 060108: VLT K-band observations
  4. GRB 060111: TAROT optical observation
  5. GRB 060111: Swift detection of a burst
  6. GRB 060110: Mitsume optical observations
  7. GRB 060110: Swift-BAT refined analysis
  8. GRB 060109: Swift-BAT refined analysis
  9. GRB 060108: z-band imaging from Gemini-North
  10. GRB 060110a: RAPTOR detection of early optical emission.
  11. GRB 060110: UKIRT K-band observations
  12. GRB 060110: IR Candidate Afterglow
  13. GRB060110, optical observation
  14. GRB 060110: Correction
  15. Correction to GRB 060109 XRT analysis
  16. GRB 050110: IR Observations
  17. GRB 060109: Refined Swift-XRT analysis
  18. GRB 060109: Swift/UVOT upper limits
  19. GRB060109, optical observation
  20. GRB 060108: ISAS early observations and near IR upper limit
  21. GRB060108: P200 Ks Observations
  22. GRB 060108: early UKIRT K-band observations
  23. GRB 060108: a dark burst?
  24. GRB 060108: Refined XRT analysis
  25. GRB 060108: VLT J-band observations
  26. GRB 060108: Mitsume optical observations
  27. GRB 060108: Swift/UVOT upper limits
  28. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  29. GRB060108: SDSS pre-burst observations
  30. GRB060108: Faulkes Telescope observation
  31. GRB060108, optical observation
  32. GRB 060108: Refined analysis of the Swift-BAT burst
  33. GRB060108: Swift detection of its 100th GRB
  34. GRB 060105: ISAS observations and near IR upper limit
  35. GRB 060105: Swift/UVOT upper limits
  36. GRB 060105: Mitsume optical observations
  37. GRB 060105: BAT refined analysis
  38. GRB 060105: XRT refined analysis
  39. GRB060105: Suzaku-XIS and -HXD observation plan
  40. GRB060105, optical observation
  41. GRB060105: Swift detection of a bright long burst
  42. Swift-BAT trigger 175653 is probably not a GRB
  43. GRB 060102: Swift-BAT refined analysis
  44. GRB 060102: Swift-BAT detection of a burst
  45. GRB 051221B: Optical Observations with Kuiper 1.54m
  46. GRB 051227: Likely host galaxy underlying afterglow position
  47. GRB 051227: optical observation
  48. GRB 051227: optical afterglow
  49. GRB 051227: Magellan r'-band Imaging/Astrometry
  50. GRB 051227: refined analysis of VLT images
  51. GRB 051227: P60 Observations
  52. GRB 051227: MDM Observation
  53. GRB 051227: R-band object in the XRT error circle
  54. GRB 051227: XRT refined analysis
  55. GRB 051227: Further analysis of the Swift-BAT burst
  56. GRB 051227: Refined analysis of the Swift-BAT burst
  57. GRB051227: SDSS pre-burst observations
  58. GRB 051227, optical observation
  59. GRB051117B: optical observation
  60. Konus-Wind observation of GRB 051221A
  61. GRB051221A: Suzaku WAM observation of the prompt emission
  62. GRB 051221A: MDM Optical Observations
  63. GRB051016: analysis of the XMM-Newton observation
  64. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  65. GRB 051221B: TAROT optical limits
  66. GRB 051221B: Refined analysis of the Swift-BAT burst
  67. GRB 051221B: BOOTES optical observations.
  68. Swift-BAT detection of a possible burst
  69. GRB 051221: Swift XRT refined analysis
  70. GRB 051221: Swift/UVOT upper limits
  71. GRB 051221: No variability in Gemini data
  72. GRB 051221: Improved astrometry of the IR counterpart
  73. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  74. GRB 051221: Swift detection of a bright short burst
  75. Swift detection of an RS CVn flare star
  76. GRB051211A: possible optical candidate
  77. GRB 051215: near-infrared observations
  78. GRB051215 - SDSS pre-burst observations
  79. GRB 051215: Swift detection of a possible burst
  80. GRB051105: optical observations
  81. GRB 051213: Swift-BAT refined analysis
  82. GRB051211B: XRT refined analysis
  83. GRB 051211B, optical observation
  84. GRB 051211A: Swift/UVOT upper limits
  85. GRB 051211B: Swift/UVOT upper limits
  86. GRB 051211A,optical observation
  87. GRB051211B: Liverpool Telescope observation
  88. GRB051211b: P60 Observations
  89. GRB 051211A and GRB051211B: BOOTES simultaneous observations
  90. GRB 051210: Swift/UVOT upper limits
  91. GRB 051210: Magellan Imaging
  92. GRB 051211: TAROT optical limits
  93. GRB 051211B: a possible optical detection by TAROT
  94. GRB 051211:IAC80 optical observations
  95. GRB 051210: SALT detection limit
  96. GRB 051210: Swift XRT refined analysis
  97. GRB 051210: FRAM early limit
  98. GRB 051210: Swift-BAT refined analysis of a short burst
  99. GRB051210: Swift UVOT Observation
  100. GRB 051210: Swift detection of a burst

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