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"

45492 results found.

  1. GRB 120815A: Swift-BAT refined analysis
  2. GRB 120805A: Liverpool Telescope optical candidate detection
  3. GRB 120815A: Enhanced Swift-XRT position
  4. GRB 120815A: VLT/X-shooter redshift
  5. GRB 120815A: GROND afterglow candidate
  6. GRB 120815A: Swift-XRT observations
  7. GRB 120815A: TAROT La Silla observatory optical observations
  8. GRB 120815A: Swift detection of a burst
  9. GRB 120811B: Fermi GBM observation
  10. GRB 120804A: Possible temporal break in the X-ray light-curve
  11. GCN for GRB 120811C
  12. GRB 120811A: Swift/XRT-UVOT Obseravations
  13. GRB120804A: Chandra observations and afterglow detection
  14. GRB 120805A: optical afterglow confirmation from the NOT
  15. GRB 120805A: Enhanced Swift-XRT position
  16. GRB 120811C: EVLA Observations
  17. GRB 120811C: RTT150 optical observations
  18. GRB 120811C: MASTER-Tunka OT observations
  19. GRB 120811C: Swift-BAT refined analysis
  20. GRB 120811A: Swift-BAT refined analysis
  21. GRB 120811C: NOT redshift
  22. GRB 120811C: Bassano Bresciano Observatory optical observations
  23. GRB 120811C: Swift-XRT refined Analysis
  24. GRB 120811C: Swift/UVOT Detection
  25. GRB 120811C: Redshift from OSIRIS/GTC
  26. Improved IPN error box for short hard GRB 120811B
  27. GRB 120811C: RTT150 optical observations
  28. GRB 120811C: Enhanced Swift-XRT position
  29. GRB 120811C: TAROT Calern observatory optical observations
  30. GRB 120811C: MASTER-Amur observations of fading OT
  31. GRB 120811C: Swift detection of a burst with an optical counterpart
  32. Konus-Wind observation of GRB 120811B
  33. IPN Triangulation of short hard GRB 120811B
  34. Trigger 530588: Swift detection of XMM J174457-2850.3
  35. Swift Trigger 530581: GRB 120811A or a galactic transient
  36. GRB 120803A: optical upper limit
  37. GRB 120807A: Swift/UVOT Upper Limits
  38. GRB 120803A: Confirmation of the X-ray afterglow
  39. GRB 120804A: Konus-Wind and Swift/BAT joint spectral analysis
  40. GRB 120714B: GROND/FORS2 detection of a supernova
  41. Swift Trigger 530441 is a false trigger
  42. GRB 120804A: ATCA 34GHz upper limit
  43. GRB 120807A: Swift-XRT refined Analysis
  44. GRB 120802A: optical observations
  45. GRB 120807A: Fermi/LAT upper limit
  46. GRB 120807A: RAPTOR Limits During Gamma-Ray Emitting Interval
  47. GRB 120804A: Gemini-North detection of an optical afterglow and putative host galaxy
  48. GRB 120807A: TAROT La Silla observatory optical observations
  49. GRB 120807A: Swift-BAT refined analysis
  50. GRB 120807A: Enhanced Swift-XRT position
  51. GRB 120807A: Swift detection of a burst
  52. GRB 120804A: ATCA 34GHz upper limit
  53. Fermi/GBM detection of an SGR-like burst
  54. Swift-BAT trigger 530214 is noise
  55. GRB 120805A: Swift/UVOT Upper Limits
  56. Swift trigger 530214: uncertain if real or not
  57. Swift-BAT trigger 529813 is due to noise while entering the SAA
  58. GRB 120728A: Fermi GBM observation
  59. GRB 120805A: Swift-BAT refined analysis
  60. GRB 120802A: Swift/UVOT Upper Limits
  61. GRB 120805A: Swift-XRT refined Analysis
  62. GRB 120805A: 1.23m CAHA observations
  63. GRB120805A: Liverpool Telescope observations
  64. GRB 120805A: TAROT Calern observatory optical observations
  65. GRB 120805A: Swift detection of a burst
  66. GRB 120804A: EVLA Detection
  67. GRB 120804A: Gemini-North observations
  68. GRB 120804A: MITSuME Okayama Optical upper limits
  69. GRB 120803B: Swift-XRT refined Analysis
  70. GRB 120804A: Swift/UVOT Upper Limits
  71. GRB 120804A: Swift-BAT refined analysis
  72. GRB 120804A: Swift-XRT refined Analysis
  73. GRB 120804A: GROND upper limits
  74. GRB 120802A: EVLA Observations
  75. GRB 120804A: Enhanced Swift-XRT position
  76. Erratum of subject line of GCN13570 (GRB 120803A => GRB 120803B)
  77. GRB 120803B: MITSuME Okayama Optical upper limits
  78. GRB 120803A: MITSuME Okayama Optical upper limits
  79. GRB 120804A: Swift detection of a short burst
  80. GRB 120803B: Swift-BAT refined analysis
  81. GRB 120803B: Enhanced Swift-XRT position
  82. GRB 120803B: MITSuME Akeno Optical upper limits
  83. GRB 120803A: Swift-XRT Observations
  84. GRB 120803A: Swift-BAT refined analysis
  85. GRB 120803B: FTN possible afterglow candidate
  86. GRB 120803B: Swift detection of a burst
  87. GRB 120803A: Swift detection of a possible burst
  88. GRB 120802A: GRT Optical Observation
  89. GRB 120802A: Swift-XRT refined Analysis
  90. GRB 120802A Gemini-N redshift
  91. GRB 120802A: APEX/LABOCA submm observations
  92. GRB 120729A: Fermi GBM observation
  93. GRB 120802A: Swift-BAT refined analysis
  94. GRB 120802A: Enhanced Swift-XRT position
  95. GRB 120802A: MASTER optical observations
  96. GRB 120802A: optical uper limit in ISON-NM observatory
  97. GRB 120802A: Swift detection of a burst
  98. GRB 120729A: JCMT SCUBA-2 sub-mm observation
  99. GRB 120728B: Fermi GBM detection
  100. Konus-Wind observation of GRB 120728B

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