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"

45739 results found.

  1. GRB 130131A: MITSuME Akeno Optical upper limits
  2. GRB 130131B: MITSuME Akeno Optical upper limits
  3. GRB 130122A: PTF P48 optical upper limits
  4. GRB 130206A: GROND Observations
  5. GRB 130206A: Fermi LAT Observations
  6. GRB 130206A: Fermi GBM observation
  7. GRB 130206A: XRT and UVOT follow-up observations.
  8. GRB 130131B: optical upper limit in Mondy observatory
  9. GRB 130206A, Swift-BAT refined analysis
  10. GRB 130206A: Zadko observatory - Gingin optical observations
  11. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  12. GRB 130206A: Swift-XRT observations
  13. GRB 130131A: optical observation in Mondy observatory
  14. GRB 130206A: Swift detection of a burst
  15. GRB 130131A: Swift/UVOT Upper Limits
  16. GRB 130131B: RATIR Upper Limits
  17. GRB 130131A: RATIR optical and infrared upper limits
  18. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  19. GRB 130131B: Swift-XRT refined Analysis
  20. GRB 130131A - UKIRT confirmation of afterglow
  21. GRB 130131B: VLT/X-shooter acquisition camera limits
  22. GRB 130131B: GROND Upper limits
  23. GRB 130131A: CARMA 3mm Observations
  24. GRB 130131A: VLA 5.8 Ghz Detection
  25. GRB 130131B: IAC80 I-band observations
  26. GRB 130131B: Swift/UVOT Upper Limits
  27. GRB 130131A: Swift-XRT refined Analysis
  28. GRB 130131B: MITSuME Okayama optical upper limits
  29. GRB 130131A: MITSuME Okayama optical upper limits
  30. GRB 130131B: Enhanced Swift-XRT position
  31. GRB 130131B: Swift-BAT refined analysis
  32. GRB 130131A: Swift-BAT refined analysis
  33. GRB 130131B: TAROT Calern observatory optical observations
  34. GRB 130131B: Zadko observatory - Gingin optical observations
  35. GRB 130131A: Enhanced Swift-XRT position
  36. GRB 130131B: Swift detection of a burst
  37. GRB 130131A - UKIRT afterglow candidate
  38. GRB 130131A: Swift detection of a burst
  39. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  40. GRB 130127A: Fermi GBM detection
  41. Swift Trigger 547142: MAXI/GSC upper limit
  42. GRB 130122A: RTT150 optical observations
  43. Swift Trigger 547142: a probable Galactic source
  44. GRB 130122A: CARMA 3mm Observations
  45. GRB 130122A: Swift/UVOT Detection
  46. GRB 130122A: optical observations
  47. GRB 130122A: RATIR Detection
  48. GRB 130122A: Swift-BAT refined analysis
  49. GRB 130122A: Swift-XRT refined Analysis
  50. GRB 130122A: Xinglong optical upper limit
  51. GRB 130122A: Enhanced Swift-XRT position
  52. GRB 130122A: MASTER-Net early marginal detection of the OT
  53. GRB 130122A: T100 observations
  54. GRB 130122A: Swift detection of a burst with an optical counterpart
  55. Short GRB 121226A: TNG observation of the host galaxy
  56. GRB 121225B: Suzaku WAM observation of the prompt emission
  57. GRB 130102B: MASTER synchronous observations
  58. GRB 130102A: Swift/UVOT Upper Limits
  59. Konus-Wind observation of GRB 130102B
  60. GRB 130102A: P60 Observations
  61. GRB 130102A: Swift-BAT refined analysis
  62. GRB 130102A: MASTER-Net optical observations
  63. GRB 130102A: Swift-XRT refined Analysis
  64. GRB 130102B: MAXI/GSC detection
  65. GRB 130102A: Enhanced Swift-XRT position
  66. GRB 130102A: IAC80 I-band observations
  67. GRB 130102A: Swift detection of a burst
  68. GRB 121226A: 5.8 GHz VLA observations
  69. Swift Trigger 544381 is a noise event
  70. GRB 121229A: Swift-XRT refined Analysis
  71. GRB 121229A, Swift-BAT refined analysis
  72. GRB 121229A: Swift/UVOT Upper Limits
  73. GRB 121229A: Enhanced Swift-XRT position
  74. GRB 121229A: VLT/X-shooter redshift
  75. Swift Trigger 544381 is unlikely to be a GRB
  76. GRB 121229A: MAXI/GSC detection
  77. GRB 121229A: GROND detection of the afterglow
  78. Skynet/PROMPT observations of GRB121229a
  79. GRB 121229A: Swift detection of a burst
  80. GRB 121226A: 10.4m GTC optical observations
  81. GRB 121226A: Swift/UVOT Upper Limits
  82. GRB 121226A: Swift-XRT refined Analysis
  83. GRB 121226A, Swift-BAT refined analysis
  84. GRB 121226A: NOT optical upper limit
  85. GRB 121226A: Optical Observations
  86. GRB 121226A: MITSuME Okayama Optical upper limits
  87. GRB 121226A: Zadko observatory - Gingin optical observations
  88. GRB 121226A: BOOTES-4/MET optical observations
  89. GRB 121226A: Swift detection of a burst
  90. Konus-Wind observation of GRB 121225B
  91. IPN Triangulation of GRB 121225B
  92. GRB 121225B: Fermi GBM observation
  93. GRB 121225B: Fermi LAT Detection
  94. GRB 121225A: MAXI/GSC detection
  95. Swift-BAT refined analysis of SGR 1E 1841-045 (Trigger=543763)
  96. Trigger 543763: SGR 1E 1841-045: Swift detection of a soft gamma repeater burst (aka Kes 73)
  97. GRB 121217A: ATCA 44GHz upper limit
  98. GRB 121217A: Swift-BAT refined analysis
  99. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  100. GRB 121217A: Fermi GBM 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