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"

37740 results found.

  1. GRB 180126A CALET Gamma-Ray Burst Monitor detection
  2. GRB 180120A: AstroSat CZTI detection
  3. Fermi GBM trigger 538030981/180119210 is not a GRB
  4. GRB 180120A: Fermi GBM Detection
  5. GRB 180120A CALET Gamma-Ray Burst Monitor detection
  6. Fermi GBM trigger 538316685/180122517 is not a GRB
  7. GRB 180113B: AstroSat CZTI detection
  8. GRB 180113A: AstroSat CZTI detection
  9. GRB 180115A: SEDM Observations
  10. GRB 180116A CALET Gamma-Ray Burst Monitor detection
  11. Konus-Wind observation of GRB 171209A
  12. GRB 180113A CALET Gamma-Ray Burst Monitor detection
  13. GRB 180112A CALET Gamma-Ray Burst Monitor detection
  14. GRB 180115A: Swift/UVOT Detection
  15. GRB 180116A: Fermi GBM Detection
  16. Konus-Wind observation of GRB 180113B
  17. IPN Triangulation of GRB 180113B
  18. GRB 180112A: Insight-HXMT/HE detection/observation
  19. GRB 180111A AROMA-N optical observation
  20. Konus-Wind observation of GRB 180113C
  21. e-MERLIN detection of GRB 171205A
  22. IPN Triangulation of GRB 180113C
  23. GRB 180115A: Swift-BAT refined analysis
  24. GRB 180116A: MAXI/GSC detection
  25. GRB 180115A: Redshift from OSIRIS/GTC
  26. GRB 180115A: NOT detection of optical counterpart
  27. Konus-Wind observation of GRB 180113A
  28. GRB 180113C: Insight-HXMT/HE observation
  29. GRB 180113B: Insight-HXMT/HE observation
  30. GRB 180111A: Insight-HXMT/HE observation
  31. GRB 180115A: MITSuME Akeno optical upper limits
  32. GRB 180113A: Swift ToO observations
  33. GRB 180115A: Swift-XRT refined Analysis
  34. GRB 180115A: Enhanced Swift-XRT position
  35. Konus-Wind observation of GRB 180111A
  36. GRB 180115A: Swift detection of a burst with an optical counterpart.
  37. GRB 180113C: Fermi GBM detection
  38. GRB 180111A CALET Gamma-Ray Burst Monitor detection
  39. GRB 180113A: Swift-BAT refined analysis
  40. GRB 180111A: AbAO optical observations
  41. GRB 180113A: KAIT Optical Observations
  42. GRB 180113B: Fermi GBM detection
  43. GRB 180113A: Fermi GBM observation
  44. GRB 180111A: Swift/UVOT Detection
  45. GRB 180103A: Swift-XRT afterglow detection
  46. GRB 180113A: Swift detection of a burst
  47. GRB 180111A: Swift-BAT refined analysis
  48. GRB 180111A: RATIR Optical and NIR Observations
  49. GRB 180111A: Swift-XRT refined Analysis
  50. GRB 180111A: AGILE/MCAL detection
  51. GRB180111A: Xinglong TNT possible optical detection
  52. GRB 180111A: Enhanced Swift-XRT position
  53. GRB 180111A: Swift detection of a burst with an optical counterpart
  54. Correction to GCN Circular 22316: GRB 171230B: Insight-HXMT detection
  55. GRB 171230B: Insight-HXMT/HE detection
  56. GRB 180103A: LCO Sutherland 1-m telescope observations
  57. Konus-Wind observation of GRB 180103A
  58. GRB 171227A: AstroSat CZTI detection
  59. GRB 171223A; AstroSat CZTI detection
  60. Fermi GBM Trigger 537135776/180108849 is not a GRB
  61. GRB 180103A: AstroSat CZTI detection
  62. GRB 180103A: Swift/UVOT Upper Limits
  63. GRB 180103A: Swift-XRT observations
  64. GRB 171230A CALET Gamma-Ray Burst Monitor detection
  65. GRB 180103A: Swift ToO observations
  66. GRB 180103A: Swift detection of a burst
  67. GRB 171229A CALET Gamma-Ray Burst Monitor detection
  68. GRB 180102A AROMA-N optical observation
  69. VLBA detection of GRB 171205A
  70. GRB 180102A: TSHAO optical upper limit
  71. GRB 180102A: Swift-BAT refined analysis
  72. GRB 180102A: Swift/UVOT Upper Limits
  73. GRB 180102A: NOT optical observations
  74. GRB 180102A: MASTER-Net robotic report
  75. GRB 180102A: Swift-XRT refined Analysis
  76. GRB 180102A: Fermi GBM detection
  77. GRB 180102A: Enhanced Swift-XRT position
  78. GRB 180102A: Prompt enhanced Swift-XRT position
  79. GRB 180102A: Swift detection of a burst
  80. Konus-Wind observation of GRB 171227A
  81. IPN Triangulation of GRB 171227A
  82. GRB 171227A: Fermi GBM detection
  83. GRB 171227A: AGILE/MCAL detection
  84. GRB 171215A: Insight-HXMT/HE detection
  85. GRB 171223A: Insight-HXMT/HE detection
  86. GRB 171212C CALET Gamma-Ray Burst Monitor detection
  87. Konus-Wind observation of GRB 171216B
  88. IceCube-171106A: Konus-Wind upper limits
  89. IceCube-171015A: Konus-Wind upper limits
  90. IceCube-170922A: Konus-Wind upper limits
  91. GRB 171222A: Swift-BAT refined analysis
  92. GRB 171222A: AROMA-N optical observation
  93. GRB 171223A: Fermi GBM detection
  94. GRB 171222A: Fermi GBM detection
  95. GRB 171222A: Nanshan-0.36m optical upper limit
  96. GRB 171222A: Swift/UVOT Upper Limits
  97. GRB 171222A: Nanshan-1m optical afterglow detection
  98. GRB 171222A: MASTER-Net OT observations
  99. GRB 171222A: Redshift from 10.4m GTC/OSIRIS
  100. GRB 171222A: Swift-XRT refined Analysis

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