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"

45495 results found.

  1. GRB 130131B: TAROT Calern observatory optical observations
  2. GRB 130131B: Zadko observatory - Gingin optical observations
  3. GRB 130131A: Enhanced Swift-XRT position
  4. GRB 130131B: Swift detection of a burst
  5. GRB 130131A - UKIRT afterglow candidate
  6. GRB 130131A: Swift detection of a burst
  7. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  8. GRB 130127A: Fermi GBM detection
  9. Swift Trigger 547142: MAXI/GSC upper limit
  10. GRB 130122A: RTT150 optical observations
  11. Swift Trigger 547142: a probable Galactic source
  12. GRB 130122A: CARMA 3mm Observations
  13. GRB 130122A: Swift/UVOT Detection
  14. GRB 130122A: optical observations
  15. GRB 130122A: RATIR Detection
  16. GRB 130122A: Swift-BAT refined analysis
  17. GRB 130122A: Swift-XRT refined Analysis
  18. GRB 130122A: Xinglong optical upper limit
  19. GRB 130122A: Enhanced Swift-XRT position
  20. GRB 130122A: MASTER-Net early marginal detection of the OT
  21. GRB 130122A: T100 observations
  22. GRB 130122A: Swift detection of a burst with an optical counterpart
  23. Short GRB 121226A: TNG observation of the host galaxy
  24. GRB 121225B: Suzaku WAM observation of the prompt emission
  25. GRB 130102B: MASTER synchronous observations
  26. GRB 130102A: Swift/UVOT Upper Limits
  27. Konus-Wind observation of GRB 130102B
  28. GRB 130102A: P60 Observations
  29. GRB 130102A: Swift-BAT refined analysis
  30. GRB 130102A: MASTER-Net optical observations
  31. GRB 130102A: Swift-XRT refined Analysis
  32. GRB 130102B: MAXI/GSC detection
  33. GRB 130102A: Enhanced Swift-XRT position
  34. GRB 130102A: IAC80 I-band observations
  35. GRB 130102A: Swift detection of a burst
  36. GRB 121226A: 5.8 GHz VLA observations
  37. Swift Trigger 544381 is a noise event
  38. GRB 121229A: Swift-XRT refined Analysis
  39. GRB 121229A, Swift-BAT refined analysis
  40. GRB 121229A: Swift/UVOT Upper Limits
  41. GRB 121229A: Enhanced Swift-XRT position
  42. GRB 121229A: VLT/X-shooter redshift
  43. Swift Trigger 544381 is unlikely to be a GRB
  44. GRB 121229A: MAXI/GSC detection
  45. GRB 121229A: GROND detection of the afterglow
  46. Skynet/PROMPT observations of GRB121229a
  47. GRB 121229A: Swift detection of a burst
  48. GRB 121226A: 10.4m GTC optical observations
  49. GRB 121226A: Swift/UVOT Upper Limits
  50. GRB 121226A: Swift-XRT refined Analysis
  51. GRB 121226A, Swift-BAT refined analysis
  52. GRB 121226A: NOT optical upper limit
  53. GRB 121226A: Optical Observations
  54. GRB 121226A: MITSuME Okayama Optical upper limits
  55. GRB 121226A: Zadko observatory - Gingin optical observations
  56. GRB 121226A: BOOTES-4/MET optical observations
  57. GRB 121226A: Swift detection of a burst
  58. Konus-Wind observation of GRB 121225B
  59. IPN Triangulation of GRB 121225B
  60. GRB 121225B: Fermi GBM observation
  61. GRB 121225B: Fermi LAT Detection
  62. GRB 121225A: MAXI/GSC detection
  63. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  64. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  65. GRB 121217A: ATCA 44GHz upper limit
  66. GRB 121217A: Swift-BAT refined analysis
  67. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  68. GRB 121217A: Fermi GBM observation
  69. GRB 121217A: Swift-XRT refined Analysis
  70. GRB 121217A: Swift/UVOT Detection
  71. GRB 121217A: GROND Detection of the Afterglow
  72. GRB 121217A: Enhanced Swift-XRT position
  73. GRB 121217A: Swift detection of a burst
  74. GRB 121123A: NIKA (New IRAM KID Arrays) millimetre observations at the 30-m Pico Veleta telescope
  75. GRB 121209A: LOAO Observation
  76. GRB 121209A: Swift/UVOT Upper Limits
  77. GRB 121212A: LOAO IzY Observation
  78. GRB 121209A: MAXI/GSC detection
  79. GRB 121212A: PdBI mm observations
  80. GRB121212A: NOT optical imaging
  81. GRB 121209A: Early CARMA Observations
  82. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  83. GRB 121212A: Maidanak optical observations
  84. GRB 121211A: Fermi GBM observation
  85. GRB 121211A: RATIR Optical and NIR Observations
  86. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  87. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  88. GRB 121212A: PAIRITEL NIR Observations
  89. GRB 121212A: Swift-XRT refined Analysis
  90. GRB 121212A: P60 Observations
  91. GRB 121212A: optical observations in ISON-NM observatory
  92. GRB 121212A: Keck observations
  93. GRB121212A: Swift/UVOT Detection
  94. GRB 121212A: Swift-BAT refined analysis
  95. GRB 121211A: Swift-BAT refined analysis
  96. GRB 121212A: Enhanced Swift-XRT position
  97. GRB 121212A: A long GRB detected by INTEGRAL
  98. GRB 121212A: Swift detection of a burst
  99. GRB 121211A: Swift/UVOT Detection
  100. GRB 121211A: MITSuME Okayama Optical Observation

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