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"

27394 results found.

  1. GRB 131127B: Bassano Bresciano Observatory optical observations
  2. GRB 131128A: Swift-XRT refined Analysis
  3. GRB 131128A: Kanata/HOWPol optical observation
  4. GRB 131128A: T100 observations
  5. GRB 131128A: Swift-BAT refined analysis
  6. GRB 131128A: Enhanced Swift-XRT position
  7. GRB 131128A: Nanshan afterglow confirmation
  8. GRB 131128A: Nanshan afterglow candidate
  9. GRB 131128A: Swift detection of a burst
  10. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  11. GRB 131127B: Fermi GBM detection
  12. GRB 131127A: Swift/UVOT Upper Limits
  13. GRB 131127A: AROMA-N Optical Observation
  14. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  15. GRB 131127A: Swift-XRT refined Analysis
  16. GRB 131127A, Swift-BAT refined analysis
  17. GRB 131127A: Enhanced Swift-XRT position
  18. GRB 131127A: Mondy optical upper limit
  19. GRB 131127A: Nanshan optical upper limit
  20. GRB 131127A: Swift detection of a burst
  21. GRB 131122A: Swift/UVOT Upper Limits
  22. GRB 131122A: Swift-XRT observations
  23. GRB 131122A: i-band observations from NOT
  24. GRB 131122A: Nanshan optical upper limit
  25. GRB 131122A: a long GRB detected with INTEGRAL
  26. GRB 131120A, Swift-BAT refined analysis
  27. IPN Triangulation of GRB 131118A
  28. GRB 131118A: Fermi GBM detection
  29. GRB 131030A, Optical Observations
  30. GRB 131117A, Swift-BAT refined analysis
  31. GRB 131117A: TAROT La Silla observatory optical observations
  32. GRB 131117A: Swift/UVOT Detection
  33. GRB 131117A: Swift-XRT refined Analysis
  34. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  35. GRB 131117A: Enhanced Swift-XRT position
  36. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  37. GRB 131117A: Swift detection of a burst
  38. GRB 131110A: Swift-XRT and UVOT upper limits
  39. GRB 131031A: Mondy optical observations
  40. GRB 131108A: ISON Blagoveshensk upper limit
  41. GRB 131108A: optical observations
  42. GRB 131108A: Continued RATIR Optical and NIR Observations
  43. GRB 131030A: MITSuME Akeno Optical observation
  44. GRB 131108A: AGILE/GRID observation
  45. GRB 131108A: Fermi GBM observation
  46. GRB 131108A: Swift/UVOT Detection
  47. GRB 131108A: RATIR Optical and NIR Observations
  48. GRB 131108A: Swift-XRT observations
  49. GRB 131108A: TAROT-Calern optical observation
  50. GRB 131108A: Fermi-LAT refined analysis
  51. GRB 131108A: NOT optical observations
  52. GRB 131108A: 1.23m CAHA optical candidate
  53. GRB 131030A: RATIR Optical and NIR Upper Limits
  54. GRB 131030A: Continued RATIR Optical and NIR Observations
  55. GRB 131029A: Suzaku WAM observation of the prompt emission
  56. GRB 131105A, Swift-BAT refined analysis
  57. GRB 131105A: Swift-XRT refined Analysis
  58. GRB 131103A: Swift-BAT refined analysis
  59. GRB 131030A: Swift-BAT refined analysis
  60. GRB 131105A: Fermi GBM observation
  61. GRB 131105A: Swift/UVOT Upper Limits
  62. GRB 131024B: Suzaku WAM observation of the prompt emission
  63. GRB 131105A: TAROT La Silla observatory optical observations
  64. GRB 131105A: Enhanced Swift-XRT position
  65. GRB 131105A: VLT/X-shooter optical afterglow candidate
  66. GRB 131105A: Swift detection of a burst
  67. GRB 131103A: NOT and VLT observations
  68. GRB 131030A: Continued RATIR Optical and NIR Observations
  69. GRB 131103A: Swift/UVOT Detection
  70. GRB 131103A: Enhanced Swift-XRT position
  71. GRB 131103A: Swift-XRT refined Analysis
  72. GRB 131103A: Swift detection of a burst
  73. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  74. GRB131031A: RATIR Optical and NIR Observations
  75. GRB 131018B: RATIR Optical/NIR Observations
  76. GRB 131030A: Continued RATIR Optical and NIR Observations
  77. GRB 131030A: the 2nd epoch of SAO RAS observations
  78. GRB 131031A: Fermi GBM detection
  79. GRB 131031A: Swift/UVOT Upper Limits
  80. LOAO B,R Observation of GRB131030A
  81. GRB 131031A: MASTER optical observation
  82. GRB 131030A: Bassano Bresciano Observatory optical observations
  83. GRB 131031A: 1.23m CAHA afterglow candidate
  84. GRB 131031A: Swift-XRT observations
  85. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  86. GRB 131031A found in ground analysis of BAT data
  87. GRB 131030A: RATIR Optical and NIR Observations
  88. GRB 131030A: TAROT La Silla observatory optical observations
  89. GRB 131030A: Swift-XRT refined Analysis
  90. GRB 131030A: Enhanced Swift-XRT position
  91. GRB 131030A: Swift/UVOT Detection
  92. GRB 131030A: SAO RAS optical observations
  93. GRB 131030A: D50+BART detection and light curve optical decay
  94. GRB 131029A: Nanshan optical observations
  95. GRB 131029A: Swift-XRT follow up
  96. GRB 131030A: Swift detection of a burst with an optical counterpart
  97. GRB 131029A: Fermi-LAT detection of a burst
  98. IPN Triangulation of GRB 131028A (long/bright)
  99. GRB 131028A: Fermi GBM detection
  100. Swift 575905/GRB 131026A: optical 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