Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

27399 results found.

  1. GRB 060607B: Swift detection of a burst
  2. GCN 060607: Swift-UVOT obswervations.
  3. GRB 060607: Swift-BAT Refined Analysis
  4. GRB 060607: Swift-XRT Team refined analysis
  5. GRB 060607: IR observations
  6. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  7. GRB 060605: RTT150 optical observations
  8. GRB 060607: REM NIR afterglow
  9. GRB 060607: Swift detection of a burst with bright optical counterpart
  10. GRB 060522: PROMPT Optical Limits
  11. GRB 060605 BAT refined analysis
  12. GRB 060605: Xinglong TNT optical observations
  13. GRB060602B : REM infrared observations
  14. GRB060605: Swift/UVOT detections
  15. GRB 060605: Swift-XRT Team refined analysis
  16. GRB 060605: RTT150 optical observations
  17. GRB 060605: Swift detection of a burst with optical counterpart
  18. GRB060604: Swift/UVOT detections
  19. GRB 060604: Swift-XRT Team refined analysis
  20. GRB 060604: BAT refined analysis
  21. GRB 060604A: ROTSE-III Optical Limits
  22. GRB 060604: Swift detection of a burst with possible optical counterpart
  23. GRB 060602A: Swift-BAT Refined Analysis: Correction
  24. GRB 060602B: Swift-XRT Refined Analysis
  25. GRB 060602B: Swift-BAT Refined Analysis
  26. GRB 060602B: Swift/UVOT observations
  27. GRB 060602A: Swift-BAT Refined Analysis
  28. GRB 060211A : WIDGET simultaneous optical observations
  29. GRB060602A: optical observations(/transient?)
  30. GRB 060602B: Swift detection of a burst
  31. GRB060602B: BOOTES-IR candidate afterglow
  32. GRB060602 - SDSS Pre-Burst Observations
  33. GRB 060502A: Optical afterglow observations
  34. GRB 060526: Break in X-ray light curve
  35. GRB060526, optical observations
  36. GRB 051227 : WIDGET simultaneous optical observations
  37. GRB 051028 : WIDGET pre-trigger limit
  38. GRB060526: Optical counterpart from MIRO
  39. GRB 060526: RTT150 optical observations
  40. GRB060526: optical observations
  41. GRB 060526: REM observations
  42. GRB 060526: RTT150 optical observations, afterglow flattening
  43. GRB 060526: MDM-2.4m Observations
  44. GRB 060526: Refined analysis of the Swift-BAT burst
  45. GRB 060526: RTT150 optical observations
  46. GRB060526, optical observations
  47. GRB 060526: Swift/XRT Team refined analysis
  48. GRB 060526: ROTSE-III Observations of Optical Counterpart
  49. GRB 060526: Watcher Observations
  50. GRB060526 - SDSS Pre-burst Observations
  51. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  52. GRB 060413 : WIDGET simultaneous optical observations
  53. XMM-Newton observation of GRB060510b
  54. GRB060512: Late-Time P200 Observations
  55. GRB 060522: Swift-BAT Refined Analysis
  56. GRB 060522: REM NIR observations
  57. GRB 060522: TNG optical observations
  58. GRB 060515: NIR observation
  59. GRB 060210: Jet Break in the XRT light curve
  60. GRB 060516: Refined analysis of the Swift-BAT burst
  61. GRB060515: P200 NIR Observations
  62. GRB 060505 BAT refined analysis
  63. GRB 060515 BAT refined analysis
  64. GRB 060512: TAROT optical observation
  65. GRB 060515: Swift/XRT Team refined analysis
  66. GRB 060515: Swift/UVOT Upper Limits
  67. GRB 060515: Swift/XRT position
  68. GRB 060515: Super-LOTIS Observations
  69. GRB 060515: TAROT optical observation
  70. GRB 060512: Subaru NIR observation
  71. GRB060512: Swift XRT Team refined analysis
  72. GRB 060512: 1.54m Kuiper Observations
  73. GRB 060512: Detection of NIR afterglow
  74. GRB 060512: P60 Observations
  75. GRB 060512: Swift-BAT Refined Analysis
  76. GRB 060512: REM NIR observations
  77. GRB060512 - SDSS Pre-Burst Observations
  78. GRB 060512: Swift detection of a burst with an optical afterglow
  79. GRB 060505: X-ray afterglow - Correction -
  80. GRB 060505: X-ray afterglow
  81. Konus-Wind observation of GRB 060510A
  82. GRB060418: optical observations
  83. GRB 060428a, SMARTS optical/IR afterglow detection
  84. GRB060510B: Swift XRT refined analysis
  85. GRB 060510A: Refined analysis of the Swift-BAT burst
  86. GRB 060510B: Swift-BAT Refined Analysis
  87. GRB060510A: XRT refined analysis
  88. GRB060510 - SDSS Pre-Burst Observations
  89. GRB 060510B: Swift detection of a burst
  90. GRB 060510: Swift detection of a burst with optical transient
  91. GRB060507: optical afterglow detection
  92. GRB060502B: improvement in the XRT afterglow position
  93. GRB 060507: Final Refined analysis of the Swift-BAT burst
  94. GRB 060507: Swift-BAT Refined Analysis
  95. GRB 060505: PROMPT Observations
  96. GRB 060507: Swift XRT Team Refined Analysis
  97. GRB 060507: Swift detection of a burst
  98. GRB 060429: Suzaku WAM observation
  99. GRB060505: Swift/UVOT Observations
  100. GRB060425: new MASTER survey method

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