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"

26483 results found.

  1. GRB 060204b: Keck/LRIS Afterglow Confirmation
  2. GRB 060204C: Liverpool Telescopes optical limit
  3. GRB 060204C: Swift-BAT detection of a burst
  4. GRB 060204A: further INTEGRAL results
  5. GRB060204B, optical observation
  6. GRB060204B - SDSS pre-burst observations
  7. GRB 060203: Swift-BAT refined analysis
  8. GRB 060204B: Swift detection of a burst
  9. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  10. GRB 060203: RTT150 optical observations
  11. GRB 060203: IR Counterpart
  12. Possible GRB 060203: optical observations at Asiago
  13. GRB 060202: PROMPT Observations
  14. GRB 060202: GETS observation
  15. GRB 060202: Gemini-N J, H, K_s observations
  16. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  17. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  18. GRB 060202: Refined analysis of the Swift-BAT burst
  19. GRB060202, optical observation
  20. GRB 060202: Swift/UVOT upper limits
  21. GRB 060121: Gemini Late-time Observations
  22. GRB 060130: PROMPT Observations
  23. GRB060130: Further R-band imaging
  24. GRB 060130: Swift/XRT observation
  25. GRB 060123: Gemini spectroscopy of the putative host galaxy
  26. GRB060130: Optical imaging
  27. GRB060130: REM infrared observations
  28. GRB 060130, SMARTS optical observations
  29. GRB 060130: FRAM optical observations
  30. GRB 060130: further INTEGRAL IBIS results
  31. GRB 060121: Confirmation of NIR Afterglow
  32. GRB 060123: Swift refined analysis of an unusual GRB
  33. GRB060124, BVRcIc field calibration
  34. GRB 060121: Probable Detection of NIR Afterglow
  35. GRB 060116 HST observations
  36. GRB 060124: HETE detection and spectrum of the main peak
  37. GRB060124: detailed XRT analysis
  38. GRB 060124: ART optical limits during the burst
  39. GRB060123: Optical and IR Imaging
  40. GRB 060123: P200 Observations
  41. GRB 060124: XRT refined analysis
  42. GRB 060124: R band Observations
  43. GRB 060124 : Optical observation at Xinglong and Kiso
  44. GRB060124: optical observations at Asiago
  45. GRB060123: SDSS pre-burst observations
  46. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  47. GRB 060121: OHP optical limits
  48. GRB 060124: TAROT optical limits
  49. GRB060124, optical observation
  50. GRB 060124: Optical Observations at Tautenburg
  51. GRB 060117: Suzaku WAM observation of the prompt emission
  52. GRB 060111B: Suzaku WAM observation of the prompt emission
  53. GRB 060124: Swift-BAT detection of a burst
  54. GRB 060121: Liverpool Telescopes optical limits
  55. GRB 060121: Swift XRT refined analysis
  56. Konus-Wind observation of GRB 060121
  57. GRB 060121: candidate optical counterpart
  58. GRB 060121: Infrared Observations
  59. GRB 060121: optical observations
  60. GRB 060121: Optical imaging
  61. GRB060121 - SDSS pre-burst observations
  62. HETE Alert 4006: MASTER promt optical limit
  63. GRB060117 - ATCA 3/6cm radio limits - correction
  64. GRB060117 - ATCA 3/6cm radio limits
  65. GRB 060116: photometric redshift - the farthest GRB?
  66. Konus-Wind observation of GRB 060117
  67. GRB 060116: UKIRT IR Observations
  68. GRB 060117: Refined analysis of the Swift-BAT burst
  69. GRB 060117: FRAM optical afterglow candidate
  70. GRB 060117: nearby galaxy
  71. GRB 060116: VLT optical observations
  72. GRB 060116: Refined analysis of the Swift-BAT burst
  73. GRB 060116: XRT refined analysis
  74. GRB 060116: IR Candidate Afterglow
  75. GRB 060116: Swift/UVOT upper limits
  76. GRB060115: REM observations
  77. GRB 060110: XRT position and analysis
  78. GRB 060116 : Lulin optical limit
  79. GRB060116: Faulkes North observation
  80. GRB 060116: Swift-BAT detection of a burst
  81. GRB 060115: Refined analysis of the Swift-BAT burst
  82. GRB 060115: Swift/UVOT upper limits
  83. GRB 060114: REM observations
  84. GRB 060115: Swift XRT refined analysis
  85. GRB 060114: Swift/UVOT Observations
  86. GRB060115, optical observation
  87. GRB 060115: MITSuME optical afterglow candidate
  88. GRB 060115: Swift detection of a burst
  89. GRB060114, optical observation
  90. GRB060114: Faulkes North observation
  91. GRB 060108: IR observations of afterglow
  92. GRB 060108: Evidence for an XRT Position Offset
  93. GRB 060110: KAIT observations
  94. GRB 060111B: Swift XRT refined analysis
  95. GRB 060111B: MITSuME detection of optical afterglow
  96. GRB 060111B: TAROT optical observation
  97. GRB060111A: RTT150 optical observations
  98. GRB060111B: RTT150, possible host galaxy
  99. GRB 060111B: Refined analysis of the Swift-BAT burst
  100. GRB 060111(a): 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