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"

43890 results found.

  1. GRB 161014A: TSHAO optical observations
  2. GRB 161011A: RATIR Optical and NIR Observations
  3. GRB 161014A: Swift-XRT and UVOT afterglow detection
  4. GRB 161014A : Xinglong TNT optical observation
  5. GRB161014A: optical afterglow candidate with the LCOGT-FTS
  6. GRB 161014A: MITSuME-Akeno optical observation
  7. GRB 161014A: Swift detection of a burst
  8. GRB 161010A: Swift/UVOT Possible Detection
  9. GRB 161010A: CALET Gamma-Ray Burst Monitor detection
  10. GRB 161011A, Swift-BAT refined analysis
  11. GRB 161011A: Swift burst of interest
  12. GRB 161011A: TSHAO afterglow candidate
  13. GRB 161011A: Swift-XRT refined Analysis
  14. Konus-Wind observation of GRB 161010A
  15. GRB 161011A: Enhanced Swift-XRT position
  16. GRB 161010A: Swift-XRT afterglow detection
  17. GRB 161011A: Prompt enhanced Swift-XRT position
  18. GRB 161011A: Swift detection of a burst
  19. GRB 161010A: Swift ToO observations
  20. GRB 161010A: a long GRB detected by INTEGRAL
  21. GRB 161007A: NOT optical observations
  22. GRB 161007A: AbAO optical observations
  23. GRB 161007A: Mondy optical observations
  24. GRB 161007A: Swift-BAT refined analysis
  25. GRB 161007A: Swift-XRT refined Analysis
  26. GRB 161007A: GTC observations
  27. GRB 161007A: Enhanced Swift-XRT position
  28. GRB 161004A: Maidanak optical observations
  29. GRB 161004A: refined analysis of TSHAO optical observations
  30. GRB 161007A: Prompt enhanced Swift-XRT position
  31. GRB 161007A: MASTER-net early optical observations
  32. GRB 161007A: Swift detection of a burst
  33. GRB 160925A: Kottamia R-band observation
  34. Konus-Wind observation of GRB 161004B
  35. GRB 160927A: GTC observations
  36. GRB 161004B: CALET Gamma-Ray Burst Monitor detection
  37. GRB 160927A: CALET Gamma-Ray Burst Monitor ground detection
  38. GRB 161004A: Swift-BAT refined analysis
  39. GRB 150302A: late-time imaging and optical afterglow confirmation
  40. GRB 161001A: IRSF upper limits
  41. GRB 161004B: Fermi GBM detection
  42. GRB 161004B: Swift/UVOT Upper Limits
  43. GRB161004B: AstroSat CZTI detection
  44. GRB 161004B: Swift-BAT refined analysis
  45. GRB 161004B: Swift-XRT refined Analysis
  46. GRB 161004A: RATIR Optical and NIR Observations
  47. GRB 161004B: Enhanced Swift-XRT position
  48. GRB 161004B: Prompt enhanced Swift-XRT position
  49. GRB 161004B: Swift detection of a burst
  50. GRB 161004A: SAO RAS optical upper limit
  51. GRB 161004A: Swift-XRT refined Analysis
  52. GRB 161004A: Swift/UVOT Detection
  53. GRB 161004A: Enhanced Swift-XRT position
  54. Swift Trigger 715209 is not an astrophysical event
  55. GRB 161004A: Bassano Bresciano Observatory upper limit
  56. GRB 161004A: TSHAO optical observations
  57. GRB 161004A: Swift detection of a burst with a possible optical counterpart
  58. GRB 160927A: 15 GHz upper limits from AMI
  59. Konus-Wind observation of GRB 161001A (short/hard ?)
  60. GRB 161001A: MASTER-OAFA and MASTER-SAAO early optical observations
  61. GRB 161001A: GROND afterglow candidate
  62. GRB 161001A, Swift-BAT refined analysis (likely a short GRB)
  63. GRB 161001A: Fermi GBM detection
  64. GRB 161001A: Swift-XRT refined Analysis
  65. GRB 161001A: X-shooter spectroscopy, candidate host galaxy and redshift
  66. GRB 161001A: Enhanced Swift-XRT position
  67. GRB 161001A: Prompt enhanced Swift-XRT position
  68. GRB 161001A: Swift detection of a burst
  69. Possible radio detection of GRB 160910A with the GMRT
  70. Fermi GBM trigger 496791348/160928900 is not a GRB
  71. GRB 160927A: Magellan imaging
  72. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  73. GRB 160927A: Swift-BAT refined analysis
  74. GRB 160927A: NOT optical observations
  75. GRB 160927A: GROND Observations
  76. GRB 160927A: Swift-XRT refined Analysis
  77. GRB 160927A: Enhanced Swift-XRT position
  78. GRB 160927A: TNG optical afterglow confirmation
  79. GRB160927A: D50 optical limit
  80. GRB 160927A: RTT150 optical afterglow candidate
  81. GRB 160927A: Prompt enhanced Swift-XRT position
  82. GRB 160927A: Swift detection of a short hard burst
  83. GRB 160917A: 15 GHz upper limits from AMI
  84. GRB 160912A: 15 GHz upper limits from AMI
  85. GRB160910A: AstroSat CZTI detection
  86. XRT refined analysis for GRB 160925A
  87. GRB 160925A/MASTER optical transient: Mondy optical observations
  88. GRB 160925A: Bassano Bresciano Photometry of MASTER optical transient
  89. GRB 160925A: Optical spectroscopy of MASTER optical transient
  90. GRB160824B: AstroSat CZTI detection
  91. GRB160917A: AstroSat CZTI detection
  92. GRB 160925A / Fermi 496473540: MASTER OT observations
  93. GRB 160925A: Swift ToO observations
  94. GRB160925A / Fermi 496473540: MASTER optical transient confirmation by LCOGT-FTN
  95. GRB 160925A / Fermi 496473540: Global MASTER Net OT discovery
  96. GRB 160910A: 15 GHz detection from AMI
  97. GRB 160917A: Mondy afterglow confirmation
  98. GRB 160910A: TSHAO optical observations
  99. GRB 160917A: Swift-BAT refined analysis
  100. GRB 160917A: RATIR Optical and NIR Observations

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