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"

20385 results found.

  1. GRB 060115: Swift/UVOT upper limits
  2. GRB 060114: REM observations
  3. GRB 060114: Swift/UVOT Observations
  4. GRB060115, optical observation
  5. GRB 060115: MITSuME optical afterglow candidate
  6. GRB 060115: Swift detection of a burst
  7. GRB060114, optical observation
  8. GRB060114: Faulkes North observation
  9. GRB 060108: IR observations of afterglow
  10. GRB 060108: Evidence for an XRT Position Offset
  11. GRB 060110: KAIT observations
  12. GRB 060111B: MITSuME detection of optical afterglow
  13. GRB 060111B: TAROT optical observation
  14. GRB060111A: RTT150 optical observations
  15. GRB060111B: RTT150, possible host galaxy
  16. GRB 060110: MARGE observations
  17. GRB 060111(a): P60 Observations
  18. GRB 060111B: Gualba observatory limit
  19. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  20. GRB 060111B: Swift detection of a burst
  21. GRB 060108: VLT K-band observations
  22. GRB 060111: TAROT optical observation
  23. GRB060111 : XRT refined analysis
  24. GRB 060111: ROTSE-III Optical Limits
  25. GRB 060111: Swift detection of a burst
  26. GRB 060110: Mitsume optical observations
  27. GRB 060108: z-band imaging from Gemini-North
  28. GRB 060110a: RAPTOR detection of early optical emission.
  29. GRB 060110: UKIRT K-band observations
  30. GRB 060110: IR Candidate Afterglow
  31. GRB060110, optical observation
  32. GRB 060110: Super-LOTIS observations
  33. GRB 060110: Correction
  34. GRB 050110: IR Observations
  35. GRB 060110: Swift-BAT detection of a burst
  36. GRB 060109: Swift/UVOT upper limits
  37. GRB060109, optical observation
  38. GRB 060108: ISAS early observations and near IR upper limit
  39. GRB060108: P200 Ks Observations
  40. GRB 060108: early UKIRT K-band observations
  41. GRB 060109: Swift Detection of a long burst
  42. GRB 060108: VLT J-band observations
  43. GRB 060108: Mitsume optical observations
  44. GRB 060108: Swift/UVOT upper limits
  45. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  46. GRB060108: SDSS pre-burst observations
  47. GRB060108: Faulkes Telescope observation
  48. GRB060108, optical observation
  49. GRB 060108: Refined analysis of the Swift-BAT burst
  50. GRB060108: Swift detection of its 100th GRB
  51. GRB 060105: MDM Observation
  52. Konus-Wind observation of GRB 060105
  53. GRB 060105: ISAS observations and near IR upper limit
  54. GRB 060105: Swift/UVOT upper limits
  55. GRB 060105: Mitsume optical observations
  56. GRB 060105: BAT refined analysis
  57. GRB 060105: XRT refined analysis
  58. GRB060105: Suzaku-XIS and -HXD observation plan
  59. GRB060105, optical observation
  60. GRB060105: Swift detection of a bright long burst
  61. GRB 060102: MDM Observation
  62. Swift-BAT trigger 175653 is probably not a GRB
  63. GRB 051221B: Optical Observations with Kuiper 1.54m
  64. GRB 051227: optical observation
  65. GRB 051227: optical afterglow
  66. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  67. GRB 051227: Magellan r'-band Imaging/Astrometry
  68. GRB 051227: refined analysis of VLT images
  69. GRB 051227: P60 Observations
  70. GRB 051227: MDM Observation
  71. GRB 051227: R-band object in the XRT error circle
  72. GRB051227: SDSS pre-burst observations
  73. GRB 051227, optical observation
  74. GRB 051227: Swift detection of a burst
  75. GRB051117B: optical observation
  76. Konus-Wind observation of GRB 051221A
  77. GRB051221A: Suzaku WAM observation of the prompt emission
  78. GRB 051221A: MDM Optical Observations
  79. GRB 051221B: ROTSE-III Optical Limits
  80. GRB 051221B: TAROT optical limits
  81. GRB 051221A: RAPTOR Fading Counterpart Constraint
  82. GRB 051221B: BOOTES optical observations.
  83. Swift-BAT detection of a possible burst
  84. GRB 051221: Swift/UVOT upper limits
  85. GRB 051221: Improved astrometry of the IR counterpart
  86. GRB 051221: Swift detection of a bright short burst
  87. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  88. Swift detection of an RS CVn flare star
  89. GRB051211A: possible optical candidate
  90. GRB 051215: near-infrared observations
  91. GRB051215 - SDSS pre-burst observations
  92. GRB 051215: Swift detection of a possible burst
  93. GRB051105: optical observations
  94. GRB 051213: Swift-BAT refined analysis
  95. GRB 051211B, optical observation
  96. GRB 051211A: Swift/UVOT upper limits
  97. GRB 051211B: Swift/UVOT upper limits
  98. GRB 051211A,optical observation
  99. GRB051211B: Liverpool Telescope observation
  100. GRB051211b: P60 Observations

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