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"

5848 results found.

  1. GRB 090626: Suzaku WAM observation of the prompt emission
  2. GRB 090709: PAIRITEL NIR Upper Limits
  3. GRB 090529: CrAO optical upper limit
  4. GRB 090529: Mt.Terskol optical observations
  5. GRB 090313: optical observations
  6. GRB 090630: Fermi GBM detection
  7. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  8. GRB 090620: Fermi GBM detecion
  9. GRB 090618: LOAO R-band Observation
  10. GRB 090529A: RTT150 Optical Observations
  11. GRB 090528: Suzaku WAM observation of the prompt emission
  12. GRB 090528: Fermi GBM detection
  13. GRB 090529: optical observations
  14. GRB 090529: TLS Afterglow Observations
  15. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  16. GRB 090529: Swift detection of a burst
  17. GRB 090520: GROND upper limits
  18. GRB 090516B: Fermi GBM detection
  19. GRB 090519: NOT afterglow candidate
  20. GRB 090516: Observations from Stardome Observatory
  21. GRB 090516: Faulkes Telescope South optical afterglow
  22. GRB 090509: Fermi GBM observation
  23. GRB 090509 - Zadko Telescope observations
  24. GRB 090515: KAIT optical upper limits
  25. GRB 090515: Swift detection of a short burst
  26. GRB 090509, SMARTS optical/IR afterglow observations
  27. GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
  28. GRB 090429B: Swift detection of a burst
  29. GRB 090429: Swift detection of a burst
  30. GRB 090425: Fermi GBM detection
  31. GRB 090424: Swift detection of a burst with an optical counterpart
  32. GRB 090423 limiting magnitudes
  33. GRB 090423: Swift-BAT refined analysis
  34. GRB 090423: UKIRT K-band observations
  35. GRB 090423: Swift detection of a burst
  36. GRB 090418: ROTSE-III Confirmation of Optical Counterpart
  37. GRB 090418: Swift detection of a burst with optical afterglow
  38. GRB 090417B: Swift detection of a burst
  39. GRB 090409: Fermi GBM detection
  40. GRB 090331: Fermi GBM detection
  41. Konus-Wind observation of GRB 090328
  42. Fermi LAT and GBM detections of GRB090328
  43. GRB 090327: Fermi GBM detection
  44. GRB 090323: Swift-XRT refined analysis
  45. GRB 090324: SuperAGILE Localization of a Long GRB
  46. GRB 090313 - PAIRITEL NIR detections
  47. GRB 090313, GROND observations
  48. GRB 090313: Swift detection of a burst
  49. GRB 090313: Swift detection of a burst
  50. GRB 090205: Zadko Telescope late-time observations
  51. GRB 090306C: Fermi GBM detection
  52. Swift-BAT trigger 345396 is not a GRB
  53. IPN localization of short GRB 090305C
  54. GRB 090305: Magellan confirmation of the optical afterglow
  55. GRB090217: XRT analysis
  56. SGR activity seen by BAT during ICSP Ionospheric Events
  57. GRB 090205: Swift-XRT refined analysis
  58. GRB 090131: Suzaku WAM observation of the prompt emission
  59. GRB 090131: Fermi GBM detection
  60. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  61. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  62. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  63. GRB 090111: Swift detection of a burst
  64. Fermi/GBM detection of GRB 081225
  65. GRB 081222: MITSuME optical observation
  66. GRB081221: Fermi GBM observation
  67. GRB 081222: Swift detection of a burst with a bright optical afterglow
  68. GRB 081215A: Fermi GBM detection
  69. GRB 081213: Fermi GBM detection
  70. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  71. GRB 081210: Swift detection of a burst with optical afterglow
  72. GRB081203A: Optical observations at Ishigaki
  73. GRB 081109: Fermi GBM detection
  74. GRB 081109: REM NIR afterglow detection
  75. GRB 081109: Swift detection of a burst
  76. Radio observation of GRB 080520 with ATCA
  77. GRB 081104: Swift detection of a burst
  78. Radio observation of GRB 080130 with ATCA
  79. GRB 081102: Swift detection of a burst
  80. Radio observation of GRB 080229b with ATCA
  81. GRB 081029: UVOT Detection of the Optical Afterglow
  82. GRB 081029: Enhanced Swift-XRT position
  83. Radio observation of GRB 080303 with ATCA
  84. Radio observation of GRB 080411 with ATCA
  85. GRB 081029: ROTSE-III Detection of Optical Counterpart
  86. GRB 081029: Swift detection of a burst
  87. GRB 081021: Fermi GBM detection
  88. GRB 081028: Swift detection of a burst
  89. GRB 081012: Swift/XRT detection
  90. GRB 081008: VLT redshift confirmation
  91. GRB 081008: VLT/FORS2 spectroscopy
  92. GRB 081008: Swift detection of a burst with optical afterglow
  93. GRB 081007: Swift detection of a burst with optical afterglow
  94. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  95. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  96. Trigger 330353: Swift detection of a Galactic short soft burst
  97. GRB 080928: GROND DETECTION
  98. GRB 080928: Swift detection of a burst with an optical counterpart
  99. Swift trigger 325707: Swift-XRT upper limit
  100. GRB080916A: Suzaku WAM observation of the prompt emission

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