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"

20967 results found.

  1. GRB060712: P60 Observations
  2. GRB 060712: Swift/UVOT Upper Limits
  3. GRB060526: optical observations
  4. GCN 060708: Swift-UVOT Observations
  5. GCN 060707: Swift-UVOT observations
  6. GRB 060707: BOOTES-IR optical observation
  7. GRB060614: Possible SN Bump in UVOT U Band Light Curve
  8. GRB 050223: Magellan redshift
  9. GRB 060614: SMARTS host galaxy observations
  10. GRB 060614: Redshift
  11. Trigger 215279: Swift detection of a possible burst (GRB 060619)
  12. GRB060614: Optical observations
  13. GRB 060614: spectroscopy
  14. GRB060512: near IR observations
  15. GRB060526: optical observations
  16. The Unusually Long-Lived Afterglow of GRB 060614
  17. GRB 060614: optical observations
  18. GRB 060605, optical observations
  19. GRB060614: SSO 1m observations
  20. GRB060614: Watcher observation
  21. GRB 060614: Swift/UVOT Observations
  22. GRB 060604, optical observations
  23. GRB 060610: KAIT observations
  24. GRB 060607: RTT150 optical observations
  25. GRB 060607: IR observations
  26. GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short Burst
  27. VLT/UVES observations of GRB 060607
  28. GRB 060607: PROMPT Observations
  29. GRB 060605: RTT150 optical observations
  30. GRB 060607: REM NIR afterglow
  31. GRB 060605: Xinglong TNT optical observations
  32. GRB060602B : REM infrared observations
  33. GRB060605: Swift/UVOT detections
  34. GRB 060605: TNG optical observations
  35. GRB 060605: RTT150 optical observations
  36. GRB060605: Spectral Observations and Redshift
  37. GRB 060605: ROTSE-III Optical Counterpart
  38. GRB 060605: ROTSE-III Detection of Optical Counterpart
  39. GRB 060604: redshift
  40. GRB 060512: Keck Redshift
  41. GRB 060602B: Swift-BAT Refined Analysis
  42. GRB 060602B: Swift/UVOT observations
  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. GRB060602B: Watcher observations - no OT candidate
  49. GRB060602B: BOOTES-IR candidate afterglow
  50. GRB060602 - SDSS Pre-Burst Observations
  51. GRB 060502A: Optical afterglow observations
  52. GRB 060526: RTT150 optical observations
  53. GRB060526, optical observations
  54. GRB 051227 : WIDGET simultaneous optical observations
  55. GRB 060526: RTT150 optical observations
  56. GRB 060526: Multiple Optical Flares
  57. GRB 060526: RTT150 optical observations
  58. GRB060502b: optical observations
  59. GRB 060526: RTT150 optical observations
  60. GRB060526: optical observations
  61. GRB 060526: SMARTS optical/IR afterglow observations
  62. GRB 060526: REM observations
  63. GRB 060526: RTT150 optical observations, afterglow flattening
  64. GRB 060526: Optical Flare
  65. GRB 060526: MDM-2.4m Observations
  66. GRB 060526: RTT150 optical observations
  67. GRB060526: Further Swift-UVOT Observations
  68. GRB060526, optical observations
  69. GRB 060526: Magellan Redshift
  70. GRB 060526: TNG optical observations
  71. GRB 060526: ROTSE-III Observations of Optical Counterpart
  72. GRB 060526: Watcher Observations
  73. GRB060526 - SDSS Pre-burst Observations
  74. GRB 060526: Continued emission for the Swift burst
  75. GRB060505: VLT observations of the optical afterglow
  76. GRB 060413 : WIDGET simultaneous optical observations
  77. GRB 060522: Swift/UVOT Observations: Correction
  78. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  79. GRB060512: Late-Time P200 Observations
  80. GRB 060522: REM NIR observations
  81. GRB 060522: TNG optical observations
  82. GRB060515: P200 NIR Observations
  83. GRB 060512: TAROT optical observation
  84. GRB 060515: Super-LOTIS Observations
  85. Swift/UVOT observations of GRB060512.
  86. GRB 060512: Subaru NIR observation
  87. GRB 060512: 1.54m Kuiper Observations
  88. GRB 060512: Detection of NIR afterglow
  89. GRB 060512: P60 Observations
  90. GRB 060512: optical decay
  91. GRB 060512: REM NIR observations
  92. GRB060512 - SDSS Pre-Burst Observations
  93. GRB060512 Name Correction: LT Afterglow detection
  94. GRB060512: Liverpool Telescope Afterglow detection
  95. GRB060418: optical observations
  96. GRB 060428a, SMARTS optical/IR afterglow detection
  97. GRB060510 - SDSS Pre-Burst Observations
  98. GRB 060510b: Redshift
  99. GRB 060510b: Gemini NIR observations
  100. GRB 060510B: Super-LOTIS Observations

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