Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28234 results found.

  1. GRB 120919B: MASTER prompt optical observations
  2. GRB 120919A: Swift/UVOT Upper Limits
  3. GRB 120919A: Swift-XRT observations
  4. GRB 120919A: Fermi GBM detection
  5. GRB 120918A: Swift-BAT refined analysis
  6. Swift trigger 534017 was not an astrophysical event
  7. GRB 120916A: Fermi GBM Observation
  8. Swift Trigger 534017 is probably not real.
  9. IPN Triangulation of long GRB 120916A
  10. Swift Trigger 533836 is a new Galactic transient
  11. GRB 120913B: Swift-BAT refined analysis
  12. GRB 120913A: Swift-BAT refined analysis
  13. GRB 120913B: REM NIR early time detection
  14. Continued Skynet/PROMPT observations of GRB120913B
  15. GRB 120913B: TAROT La Silla observatory optical photometry
  16. GRB 120913B: TAROT La Silla observatory optical detection
  17. Skynet/PROMPT observations of GRB120913B
  18. GRB 120907A: optical observations of ISON-Kislovodsk
  19. GRB 120911A: optical upper limit CrAO
  20. GRB 120911A: optical upper limit ISON-NM
  21. GRB 120911B: Fermi-LAT detection of a burst
  22. GRB 120911A: Fermi GBM observation
  23. GRB120911A: MITSuME Okayama Optical upper limits
  24. GRB 120911A: Fermi/LAT upper limit
  25. GRB 120911A: Swift/UVOT Upper Limits
  26. GRB 120911A: Swift-XRT refined Analysis
  27. GRB 120911A: Swift-BAT refined analysis
  28. GRB 120911A: Enhanced Swift-XRT position
  29. GRB 120911A: Swift-XRT observations
  30. GRB 120911A: ROTSE-III Optical Limits
  31. GRB 120911A: Swift detection of a burst
  32. GRB 120908A and GRB 120909A : Fermi/LAT upper limit
  33. GRB 120908A: Fermi GBM detection
  34. GRB 120908A: Swift Observations
  35. GRB 120909A: TAROT La Silla observatory optical observations
  36. GRB 120909A: Pi of the Sky upper limits
  37. GRB 120909A: Fermi GBM observation
  38. Konus-Wind observation of GRB 120909A
  39. GRB 120909A: Swift/UVOT Detection
  40. GRB 120909A: Swift-XRT refined Analysis
  41. GRB 120909A: Swift-BAT refined analysis
  42. GRB 120909A: Enhanced Swift-XRT position
  43. GRB 120909A: GROND detection of the afterglow
  44. Skynet/PROMPT Observations of GRB120909A
  45. GRB 120909A: Swift detection of a burst
  46. GRB 120907A: Swift/UVOT Detection
  47. GRB 120907A: Swift-XRT refined Analysis
  48. GRB 120907A: Enhanced Swift-XRT position
  49. GRB 120907A: Fermi GBM detection
  50. GRB 120907A: Swift-BAT refined analysis
  51. GRB 120907A: NOT optical observations
  52. GRB 120907A: Swift detection of a burst with optical counterpart
  53. GRB 120802A: optical observations in CrAO
  54. GRB 120830A: Swift-XRT and UVOT observations
  55. GRB 120830A: early MASTER optical limit
  56. GRB 120830A: Fermi-LAT detection of a short burst
  57. Fermi trigger 368003226 : MASTER optical observations
  58. GRB 120819A: Swift/UVOT Upper Limits
  59. GRB 120817A: Swift/UVOT Upper Limits
  60. GRB 120817B: Deep limit on the optical afterglow from du Pont and Magellan observations
  61. GRB 120821A: Swift/UVOT Upper Limits
  62. GRB 120821A: GROND upper limits
  63. GRB 120817B - PTF Observations
  64. GRB 120817A: RAPTOR Limits During Gamma-Ray Emitting Interval
  65. GRB 120811C: optical observations
  66. GRB 120819A: MASTER final limits
  67. GRB 120819A: Bassano Bresciano Observatory optical observations
  68. GRB 120819A: Swift-BAT refined analysis
  69. GRB 120819A: GROND afterglow confirmation
  70. GRB 120819A: Swift-XRT refined Analysis
  71. GRB 120819A: MITSuME Ishigakijima upper limits
  72. GRB 120819A: MITSuME Okayama Optical upper limits
  73. GRB 120819A: Enhanced Swift-XRT position
  74. GRB 120819A: afterglow candidate from NOT
  75. GRB 120819A: Swift detection of a burst
  76. GRB 120817B: Swift-XRT observations
  77. GRB 120811C: optical observations
  78. GRB 120816A: Swift/UVOT Detection of the Optical Afterglow
  79. GRB 120815A: MASTER-ICATE observations
  80. IPN Triangulation of GRB 120816B (short/exceptionally intense)
  81. GRB 120817A: Swift-XRT refined Analysis
  82. GRB 120817B: LCO Optical Observations
  83. GRB 120817A: Swift-BAT refined analysis
  84. GRB 120816A: optical upper limit
  85. GRB 120817A: Enhanced Swift-XRT position
  86. GRB 120815A: Swift/UVOT Detection of the Optical Afterglow
  87. GRB 120816A: Bassano Bresciano Observatory optical observations
  88. GRB 120817A: FTN and FTS observations
  89. GRB 120816A: Swift-XRT refined Analysis
  90. GRB 120817A: Swift-XRT observations
  91. GRB 120816A: Enhanced Swift-XRT position
  92. GRB 120816A: Swift-BAT refined analysis
  93. GRB 120816A: BOOTES-2 observations
  94. GRB120816A: OPTIMA discovery of optical counterpart
  95. GRB 120816A: TAROT Calern observatory optical observations
  96. GRB 120816A: ROTSE-III Optical Limits
  97. GRB 120816A: Swift detection of a burst
  98. GRB 120815A: Swift-XRT refined Analysis
  99. GRB 120815A: Swift-BAT refined analysis
  100. GRB 120805A: Liverpool Telescope optical candidate detection

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