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"

43060 results found.

  1. GRB 120106A: Swift detection of a burst
  2. GRB111228A :LOAO R-band Observations
  3. GRB 111225A, the review of the sky area in plate archives
  4. GRB 111222A, the review of the sky area in plate archives
  5. GRB 111222A: Fermi GBM observations
  6. GRB 111222A: Second Swift observation
  7. GRB111209A: ATCA detection at 5.5, 9, and 18GHz
  8. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  9. GRB 111211A: Detection of the SN with the 10.4m GTC
  10. GRB 120102A: Fermi GBM observation
  11. Konus-Wind observation of GRB 120102A
  12. GRB 120102A: Swift-BAT refined analysis
  13. GRB 111228A: optical observations in CrAO
  14. GRB 120102A: Swift-XRT refined Analysis
  15. GRB 120102A: Swift/UVOT Detection
  16. GRB 120102A: Enhanced Swift-XRT position
  17. GRB 120102A: Swift detection of a burst with an optical counterpart
  18. GRB 111225A: optical observations in CrAO
  19. GRB 111228A, optical observations
  20. GRB 111228A: LOAO Optical Observation
  21. Konus-Wind observation of GRB 111228A
  22. GRB 111228A: MASTER-Net optical photometry
  23. GRB 111228A: Optical and NIR observations with Kanata telescope
  24. GRB 110915A, the review of the sky area in plate archives
  25. GRB 111228A: SMARTS optical/IR afterglow observations
  26. GRB 111229A: Swift/UVOT Detection
  27. GRB 111229A: Faulkes Telescope South observations
  28. GRB 111229A: Swift-XRT refined Analysis
  29. GRB 111229A: Enhanced Swift-XRT position
  30. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  31. GRB111228A: Further GMG observations
  32. GRB 111229A: Gemini-South Redshift
  33. GRB 111229A: Swift-BAT refined analysis
  34. GRB 111229A: GROND afterglow candidate
  35. GRB 111229A: Swift detection of a burst
  36. GRB 111228A: Liverpool Telescope Observations
  37. GRB 111225A: Lightbuckets Optical Observations
  38. GRB 111228A: P60 Observations
  39. GRB 111228A: X-shooter spectroscopy
  40. GRB 111228A: T100 observations
  41. GRB111228A: MITSuME Akeno photometry of the optical afterglow
  42. GRB 111228A: GMG optical observation
  43. GRB 111228A: Swift-XRT refined Analysis
  44. GRB 111228A: NOT redshift
  45. GRB111228A: TNG spectroscopy analysis
  46. FERMI GRB111228.45: MASTER observations
  47. GRB 111228A: Gemini South Redshift
  48. GRB 111228A: PAIRITEL NIR Detection
  49. GRB 111228A: MMT Redshift
  50. GRB 111228A: TAROT La Silla observatory observations
  51. GRB 111228A: GROND observations
  52. GRB 111228A: MASTER OT observations
  53. GRB111228A: Errata of MITSuME Okayama about GRB name in GCNC 12743
  54. GRB 111228A: GRAS017 optical observations
  55. GRB 111228A: Swift/UVOT Detection
  56. GRB 111228A: Skynet/Dolomiti Optical Observations
  57. GRB 111228A: NOT optical observation
  58. GRB 111228A, Swift-BAT refined analysis
  59. GRB 111228A: optical observations
  60. GRB 111228A: Enhanced Swift-XRT position
  61. GRB 111228A: TAROT Calern observatory. OT decay stopped
  62. GRB 111228A, optical observations
  63. GRB 111228A: Fermi GBM observation
  64. GRB111228A: MITSuME Okayama Optical Observation
  65. GRB 111228A: TAROT Calern observatory. OT seems still bright
  66. GRB 111225A, optical observations
  67. XMM-Newton observation of the short GRB 111020A
  68. GRB 111228A: Swift detection of a burst with an optical counterpart
  69. GRB 111225A: Swift/UVOT Observations
  70. GRB 111215A: Keck/LRIS Imaging
  71. GRB 111225A: Keck/LRIS Afterglow Photometry
  72. GRB 111222A : Suzaku WAM observation of the prompt emission
  73. GRB 111225A: PAIRITEL NIR Upper Limits
  74. GRB111225A: MITSuME Okayama optical upper limits
  75. GRB 111225A: GRT Optical Observation
  76. GRB 111225A: Swift-XRT refined Analysis
  77. GRB 111225A, Swift-BAT refined analysis
  78. GRB 111225A: Enhanced Swift-XRT position
  79. GRB 111225A: Super-LOTIS early detection
  80. GRB 111225A: TAROT Calern observatory optical detection
  81. GRB 111225A: TAROT Calern observatory optical observations
  82. GRB 111225A: Swift detection of a burst with an optical counterpart
  83. GRB111222A: GMG optical observation
  84. GRB 111222A: Xinglong TNT observation
  85. GRB 111222A: Swift/UVOT Observations
  86. GRB 111222A: Swift-XRT observations
  87. Konus-Wind observation of GRB 111222A
  88. IPN Triangulation of GRB 111222A (short/hard/intense)
  89. GRB 111210A: optical upper limit of Mt. Terskol observatory
  90. Trigger 510075 is not a GRB
  91. GRB 111215A: EVLA observations
  92. XRT GRB Catalogue now live and online
  93. GRB 111103B: optical upper limit
  94. GRB 110820A: optical observations in Maidanak observatory
  95. GRB 111103A: optical upper limit of Mt. Terskol observatory
  96. GRB 111215B: Suzaku WAM observation of the prompt emission
  97. GRB 111211A: optical ovservations at Mt. Terskol observatory
  98. GRB111215A: optical upper limit
  99. GRB 111215B: Swift/UVOT Upper Limits
  100. Konus-Wind observation of GRB 111215B

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