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"

42680 results found.

  1. GBM trigger 347620337 (GRB 120107A?) : High-energy photon emission in Fermi/LAT data
  2. GRB 120106A: Bassano Bresciano Observatory optical observations
  3. GRB 120106A: MITSuME Okayama Ks-band upper limit
  4. GRB 120106A: MASTER Early OT marginally detection
  5. GRB 120106A: Swift-XRT refined Analysis
  6. INTEGRAL Weak trigger #6433: GRT Optical Observation
  7. GRB 120106A: Swift-BAT refined analysis
  8. GRB 120106A: Enhanced Swift-XRT position
  9. GRB 120106A: TAROT Calern observatory optical observations
  10. GRB 120106A: MASTER-Tunka optical observations
  11. GRB 120106A: Swift detection of a burst
  12. GRB111228A :LOAO R-band Observations
  13. GRB 111222A: Fermi GBM observations
  14. GRB 111222A: Second Swift observation
  15. GRB111225A: RAPTOR Early Detection of the Optical Counterpart
  16. GRB 111211A: Detection of the SN with the 10.4m GTC
  17. GRB 120102A: Fermi GBM observation
  18. Konus-Wind observation of GRB 120102A
  19. GRB 120102A: Swift-BAT refined analysis
  20. GRB 111228A: optical observations in CrAO
  21. GRB 120102A: Swift-XRT refined Analysis
  22. GRB 120102A: Swift/UVOT Detection
  23. GRB 120102A: Enhanced Swift-XRT position
  24. GRB 120102A: Swift detection of a burst with an optical counterpart
  25. GRB 111225A: optical observations in CrAO
  26. GRB 111228A: LOAO Optical Observation
  27. Konus-Wind observation of GRB 111228A
  28. GRB 111228A: MASTER-Net optical photometry
  29. GRB 111228A: correction for GCN 12787
  30. GRB 111228A: Optical and NIR observations with Kanata telescope
  31. GRB 111228A: SMARTS optical/IR afterglow observations
  32. GRB 111229A: Swift/UVOT Detection
  33. GRB 111229A: Faulkes Telescope South observations
  34. GRB 111229A: Swift-XRT refined Analysis
  35. GRB 111229A: Enhanced Swift-XRT position
  36. GRB 111228A: Continued Skynet PROMPT/Dolomiti Optical Observations
  37. GRB111228A: Further GMG observations
  38. GRB 111229A: Gemini-South Redshift
  39. GRB 111229A: Swift-BAT refined analysis
  40. GRB 111229A: GROND afterglow candidate
  41. GRB 111229A: Swift detection of a burst
  42. GRB 111228A: Liverpool Telescope Observations
  43. GRB 111228A: P60 Observations
  44. GRB 111228A: X-shooter spectroscopy
  45. GRB 111228A: T100 observations
  46. GRB 111228A: GMG optical observation
  47. GRB 111228A: Swift-XRT refined Analysis
  48. GRB 111228A: NOT redshift
  49. GRB111228A: TNG spectroscopy analysis
  50. FERMI GRB111228.45: MASTER observations
  51. GRB 111228A: Gemini South Redshift
  52. GRB 111228A: PAIRITEL NIR Detection
  53. GRB 111228A: MMT Redshift
  54. GRB 111228A: TAROT La Silla observatory observations
  55. GRB 111228A: GROND observations
  56. GRB 111228A: MASTER OT observations
  57. GRB 111228A: GRAS017 optical observations
  58. GRB 111228A: IAC80 BVI-band observations
  59. GRB 111228A: Skynet/Dolomiti Optical Observations
  60. GRB 111228A: NOT optical observation
  61. GRB 111228A, Swift-BAT refined analysis
  62. GRB 111228A: optical observations
  63. GRB 111228A: Enhanced Swift-XRT position
  64. GRB 111228A: TAROT Calern observatory. OT decay stopped
  65. GRB 111228A, optical observations
  66. GRB 111228A: Fermi GBM observation
  67. GRB 111228A: TAROT Calern observatory. OT seems still bright
  68. GRB 111228A: Possible host galaxy in the SDSS arhive
  69. GRB 111225A, optical observations
  70. XMM-Newton observation of the short GRB 111020A
  71. GRB 111228A: Xinglong TNT confirms the optical afterglow
  72. GRB 111228A: Swift detection of a burst with an optical counterpart
  73. GRB 111205A: optical observations
  74. GRB 111225A: Swift/UVOT Observations
  75. GRB 111215A: Keck/LRIS Imaging
  76. GRB 111225A: Keck/LRIS Afterglow Photometry
  77. GRB 111222A : Suzaku WAM observation of the prompt emission
  78. GRB 111225A: PAIRITEL NIR Upper Limits
  79. GRB 111225A: GRT Optical Observation
  80. GRB 111225A: 1.23m CAHA optical observations
  81. GRB 111225A: Swift-XRT refined Analysis
  82. GRB 111225A, Swift-BAT refined analysis
  83. GRB 111225A: Enhanced Swift-XRT position
  84. GRB 111225A: Super-LOTIS early detection
  85. GRB 111225A: TAROT Calern observatory optical detection
  86. GRB 111225A: TAROT Calern observatory optical observations
  87. GRB 111225A: Swift detection of a burst with an optical counterpart
  88. GRB111222A: GMG optical observation
  89. GRB 111222A: Swift/UVOT Observations
  90. GRB 111222A: Swift-XRT observations
  91. Konus-Wind observation of GRB 111222A
  92. IPN Triangulation of GRB 111222A (short/hard/intense)
  93. GRB 111210A: optical upper limit of Mt. Terskol observatory
  94. Trigger 510075 is not a GRB
  95. GRB 111215A: EVLA observations
  96. GRB111215A: CARMA Detection
  97. XRT GRB Catalogue now live and online
  98. GRB 111103B: optical upper limit
  99. GRB 110820A: optical observations in Maidanak observatory
  100. GRB 111103A: optical upper limit of Mt. Terskol observatory

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