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"

43672 results found.

  1. GRB 120911A: Faulkes Telescope North observations
  2. GRB 120911A: Swift-XRT observations
  3. GRB 120911A: ROTSE-III Optical Limits
  4. GRB 120911A: Swift detection of a burst
  5. GRB 120907A: SMA upper limits
  6. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  7. GRB 120908A: Fermi GBM detection
  8. GRB 120908A: Swift Observations
  9. GRB 120909A: TAROT La Silla observatory optical observations
  10. GRB 120909A: Pi of the Sky upper limits
  11. GRB 120909A: Fermi GBM observation
  12. Konus-Wind observation of GRB 120909A
  13. GRB 120909A: Swift/UVOT Detection
  14. GRB 120909A: Swift-XRT refined Analysis
  15. GRB 120909A: Swift-BAT refined analysis
  16. GRB 120909A: Enhanced Swift-XRT position
  17. GRB 120908A: MAXI/GSC detection
  18. GRB 120909A: X-Shooter redshift 3.93
  19. GRB 120909A: GROND detection of the afterglow
  20. Skynet/PROMPT Observations of GRB120909A
  21. GRB 120909A: Swift detection of a burst
  22. GRB 120907A: EVLA observations
  23. GRB 120907A: Swift/UVOT Detection
  24. GRB 120907A: Swift-XRT refined Analysis
  25. GRB 120907A: Spectroscopy from OSIRIS/GTC
  26. GRB 120907A: Enhanced Swift-XRT position
  27. GRB 120907A: Fermi GBM detection
  28. GRB 120907A: Swift-BAT refined analysis
  29. GRB 120907A: NOT optical observations
  30. GRB 120907A MASTER optical observations
  31. GRB 120907A: ROTSE-III Optical Limits
  32. GRB 120907A: Swift detection of a burst with optical counterpart
  33. XMM observations of the short GRB120804A
  34. GRB 120819A: optical upper limit
  35. GRB 120802A: optical observations in CrAO
  36. GRB 120830A: Further Swift Observations
  37. GRB 120830A: Swift-XRT and UVOT observations
  38. GRB 120830A: Fermi GBM observation
  39. Konus-Wind observation of GRB 120830A
  40. GRB 120830A: early MASTER optical limit
  41. IPN Triangulation of short GRB 120830A
  42. GRB 120830A: Fermi-LAT detection of a short burst
  43. Fermi trigger 368003226 : MASTER optical observations
  44. GRB 120819A: Swift/UVOT Upper Limits
  45. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  46. GRB 120821A: Swift/XRT observations
  47. GRB 120821A: a long GRB detected by INTEGRAL
  48. GRB 120817B - PTF Observations
  49. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  50. GRB 120811C: optical observations
  51. GRB 120817B: BAT location in ground analysis and refined analysis
  52. GRB 120819A: MASTER final limits
  53. GRB 120819A: Swift-BAT refined analysis
  54. GRB 120819A: GROND afterglow confirmation
  55. GRB 120819A: Swift-XRT refined Analysis
  56. GRB 120819A: Enhanced Swift-XRT position
  57. GRB 120819A: afterglow candidate from NOT
  58. GRB 120819A: MASTER optical observations
  59. GRB 120819A: Swift detection of a burst
  60. GRB 120817B: Swift-XRT observations
  61. GRB 120811C: optical observations
  62. GRB 120815A: MASTER-ICATE observations
  63. Konus-Wind observation of GRB 120816B
  64. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  65. Konus-Wind observation of GRB 120817B
  66. GRB 120817A: Swift-XRT refined Analysis
  67. GRB 120817B: LCO Optical Observations
  68. GRB 120817B: Fermi GBM detection
  69. IPN Triangulation of GRB 120817B (short/very intense)
  70. GRB 120817A: Swift-BAT refined analysis
  71. GRB 120816A: optical upper limit
  72. GRB 120817A: Enhanced Swift-XRT position
  73. GRB 120817A: FTN and FTS observations
  74. GRB 120816A: Swift-XRT refined Analysis
  75. GRB 120817A: Swift-XRT observations
  76. GRB 120817A: Swift detection of a burst
  77. GRB 120816A: Enhanced Swift-XRT position
  78. GRB 120816A: Swift-BAT refined analysis
  79. GRB 120816A: BOOTES-2 observations
  80. GRB120816A: OPTIMA discovery of optical counterpart
  81. GRB 120816A: TAROT Calern observatory optical observations
  82. GRB 120816A: ROTSE-III Optical Limits
  83. GRB 120816A: Swift detection of a burst
  84. GRB 120815A: Swift-XRT refined Analysis
  85. GRB 120815A: Swift-BAT refined analysis
  86. GRB 120805A: Liverpool Telescope optical candidate detection
  87. GRB 120815A: Enhanced Swift-XRT position
  88. GRB 120815A: VLT/X-shooter redshift
  89. GRB 120815A: GROND afterglow candidate
  90. GRB 120815A: Swift-XRT observations
  91. GRB 120815A: TAROT La Silla observatory optical observations
  92. GRB 120815A: Swift detection of a burst
  93. GRB 120811B: Fermi GBM observation
  94. GRB 120804A: Possible temporal break in the X-ray light-curve
  95. GCN for GRB 120811C
  96. GRB 120811A: Swift/XRT-UVOT Obseravations
  97. GRB120804A: Chandra observations and afterglow detection
  98. GRB 120805A: optical afterglow confirmation from the NOT
  99. GRB 120805A: Enhanced Swift-XRT position
  100. GRB 120811C: EVLA 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