Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

36048 results found.

  1. GRB 060602A: Swift/XRT analysis
  2. GRB 060610: KAIT observations
  3. GRB 060607: RTT150 optical observations
  4. GRB 070706B: Watcher upper limit
  5. GRB 060607B: Swift-BAT Refined Analysis
  6. GRB 060607B: Swift detection of a burst
  7. GCN 060607: Swift-UVOT obswervations.
  8. GRB 060607: Swift-BAT Refined Analysis
  9. GRB 060607: optical limit by "Pi of the Sky"
  10. GRB 060607: Swift-XRT Team refined analysis
  11. GRB 060607: IR observations
  12. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  13. VLT/UVES observations of GRB 060607
  14. GRB 060607: PROMPT Observations
  15. GRB 060605: RTT150 optical observations
  16. GRB 060607: REM NIR afterglow
  17. GRB 060607: Swift detection of a burst with bright optical counterpart
  18. GRB 060522: PROMPT Optical Limits
  19. GRB 060605 BAT refined analysis
  20. GRB 060605: Xinglong TNT optical observations
  21. GRB060602B : REM infrared observations
  22. GRB060605: Swift/UVOT detections
  23. GRB 060605: Swift-XRT Team refined analysis
  24. SALT spectroscopy of GRB 060605
  25. GRB 060605: TNG optical observations
  26. GRB 060605: RTT150 optical observations
  27. GRB 060605: ROTSE-III Optical Counterpart
  28. GRB 060605: Swift detection of a burst with optical counterpart
  29. GRB 060605: ROTSE-III Detection of Optical Counterpart
  30. GRB 060604: redshift
  31. GRB 060512: Keck Redshift
  32. GRB 060604 optical photometry
  33. GRB 060604: Swift-XRT Team refined analysis
  34. GRB 060604: BAT refined analysis
  35. GRB 060604A: ROTSE-III Optical Limits
  36. GRB 060604: Swift detection of a burst with possible optical counterpart
  37. GRB 060602A: Swift-BAT Refined Analysis: Correction
  38. GRB 060602B: XMM-Newton Survey Source
  39. GRB 060602B: Swift-XRT Refined Analysis
  40. GRB 060602B: Swift-BAT Refined Analysis
  41. GRB 060602B: Swift/UVOT observations
  42. GRB 060602A: Swift-BAT Refined Analysis
  43. GRB 060602B: RTT150 optical observations
  44. GRB 060211A : WIDGET simultaneous optical observations
  45. GRB060602A: optical observations(/transient?)
  46. GRB 060526: Tautenburg Second Epoch Observations
  47. GRB060602A: Bootes-IR observations
  48. GRB 060602B: Swift detection of a burst
  49. GRB060602B: Watcher observations - no OT candidate
  50. GRB060602B: BOOTES-IR candidate afterglow
  51. GRB060602 - SDSS Pre-Burst Observations
  52. GRB 060602: Swift detection of a burst
  53. GRB 060502A: Optical afterglow observations
  54. GRB 060526: Break in X-ray light curve
  55. GRB 060526: RTT150 optical observations
  56. GRB060526, optical observations
  57. GRB 051227 : WIDGET simultaneous optical observations
  58. GRB 051028 : WIDGET pre-trigger limit
  59. GRB 060526: RTT150 optical observations
  60. GRB 060526: Multiple Optical Flares
  61. GRB060526: afterglow fitting and probable jet break
  62. GRB 060526: RTT150 optical observations
  63. GRB060502b: optical observations
  64. GRB 060526: RTT150 optical observations
  65. GRB 060526: Tautenburg OT observation and light curve fitting
  66. GRB060526: optical observations
  67. GRB 060526: SMARTS optical/IR afterglow observations
  68. GRB 060526: REM observations
  69. GRB 060526: RTT150 optical observations, afterglow flattening
  70. GRB 060526: Optical Flare
  71. GRB 060526: MDM-2.4m Observations
  72. GRB 060526: Refined analysis of the Swift-BAT burst
  73. GRB 060526: RTT150 optical observations
  74. GRB060526, optical observations
  75. GRB 060526: Magellan Redshift
  76. GRB 060526 Lulin optical observation
  77. GRB 060526: Swift/XRT Team refined analysis
  78. GRB 060526: TNG optical observations
  79. GRB 060526: ROTSE-III Observations of Optical Counterpart
  80. GRB 060526: Watcher Observations
  81. GRB060526 - SDSS Pre-burst Observations
  82. GRB 060526: Continued emission for the Swift burst
  83. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  84. GRB060505: VLT observations of the optical afterglow
  85. GRB 060413 : WIDGET simultaneous optical observations
  86. GRB 060522: Swift/UVOT Observations: Correction
  87. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  88. XMM-Newton observation of GRB060510b
  89. GRB 060522: Swift/XRT Team refined analysis
  90. GRB 060522: Swift-BAT Refined Analysis
  91. GRB 060522: REM NIR observations
  92. GRB 060522: TNG optical observations
  93. GRB 060522: Swift detection of a burst with possible optical afterglow
  94. GRB 060512: reanalysis of optical spectra
  95. GRB 060515: NIR observation
  96. GRB 060210: Jet Break in the XRT light curve
  97. GRB 060516: Refined analysis of the Swift-BAT burst
  98. GRB 060512: TNG optical spectroscopy
  99. GRB 060516: Swift detection of a burst
  100. GRB 060505 BAT refined analysis

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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