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"

24513 results found.

  1. GRB 240805A: SVOM/GRM observation
  2. GRB 240805B: LCOGT Optical Upper Limits
  3. Swift GRB 240805B: Global MASTER-Net observations report
  4. Fermi GRB 240805A: Global MASTER-Net observations report
  5. Swift GRB 240805A: Global MASTER-Net observations report
  6. GRB 240805A: Fermi-LAT detection
  7. EP-WXT trigger 00109017646 is not a real source
  8. EP240802a: correction of EP-WXT trigger time in GCN 37019
  9. GRB 240805A: Swift detection of a burst
  10. GRB 240805A: Fermi GBM Final Real-time Localization
  11. Fermi GRB 240804A: Global MASTER-Net observations report
  12. GRB 240804A: Fermi GBM Final Real-time Localization
  13. Fermi trigger No 744459130: Global MASTER-Net observations report
  14. IPN triangulation of GRB 240802A / EP 240802a
  15. GRB 240802A: SVOM/GRM observation
  16. EP240802a: Time coincidence with GRB 240802A and optical upper limits with Kinder observations
  17. Fermi trigger No 744278264: Global MASTER-Net observations report
  18. GRB 240802A: AstroSat CZTI detection of a long burst
  19. EP240801a: GRANDMA and Kilonova-Catcher optical observations
  20. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  21. GRB 240727C: SVOM/GRM observation
  22. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  23. GRB 240730A: Swift-BAT refined analysis
  24. Fermi trigger No 744204856: Global MASTER-Net observations report
  25. EP240801a: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  26. Fermi GRB 240801A: Global MASTER-Net observations report
  27. GRB 240801A: Fermi GBM Final Real-time Localization
  28. GRB 240731A: Fermi GBM Final Localization
  29. Fermi trigger No 744128417: Global MASTER-Net observations report
  30. Fermi trigger No 744083370: Global MASTER-Net observations report
  31. Fermi GRB 240730B: Global MASTER-Net observations report
  32. GRB 240730B: Fermi GBM Final Real-time Localization
  33. Swift GRB 240730A: Global MASTER-Net observations report
  34. GRB 240715A: Swift-XRT afterglow detection
  35. GRB 240727C: GRBAlpha detection
  36. Fermi trigger No 743953682: Global MASTER-Net observations report
  37. GRB 240727A: Swift-BAT refined analysis
  38. Fermi GRB 240727A: Global MASTER-Net observations report
  39. Fermi trigger No 743868421: Global MASTER-Net observations report
  40. GRB 240727A: Correction to time in GCN36960
  41. EP-WXT trigger 01709002661 is not a real source
  42. GRB 240727A: NOT optical observation
  43. GRB 240727A: Fermi GBM Final Real-time Localization
  44. GRB 240720B: GRBAlpha detection
  45. GRB 240718A: GRBAlpha detection
  46. GRB 240710B: GRBAlpha detection
  47. GRB 240627A: GRBAlpha detection
  48. Fermi GRB 240726A: Global MASTER-Net observations report
  49. GRB 240727B: Fermi GBM Observation
  50. Swift GRB240727.16: Global MASTER-Net observations report
  51. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  52. GRB 240726A: SVOM/GRM observation
  53. GRB 240727A: KAIT Optical Afterglow Candidate
  54. GRB 240726A: AstroSat CZTI detection of a short burst
  55. IceCube-240725A: Upper limits from a search for additional neutrino events in IceCube
  56. GRB 240726A: Fermi GBM Final Real-time Localization
  57. Fermi-LAT gamma-ray observations of IceCube-240725A
  58. IceCube Alert 240725.22: Global MASTER-Net observations report
  59. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  60. Swift GRB240725.11: Global MASTER-Net observations report
  61. IceCube-240721A: Two candidates from the Zwicky Transient Facility
  62. GRB 240720A: Swift-BAT refined analysis
  63. IceCube-240721A: Upper limits from a search for additional neutrino events in IceCube
  64. Fermi trigger No 743418632: Global MASTER-Net observations report
  65. Fermi trigger No 743315411: Global MASTER-Net observations report
  66. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  67. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  68. Fermi trigger No 743345551: Global MASTER-Net observations report
  69. Fermi-LAT gamma-ray observations of IceCube-240721A
  70. Fermi trigger No 743219692: Global MASTER-Net observations report
  71. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  72. IceCube Alert 240721.68: Global MASTER-Net observations report
  73. GRB 240720B: SVOM/GRM observation
  74. GRB 240721A: Fermi GBM Final Real-time Localization
  75. Fermi GRB 240720A: Global MASTER-Net observations report
  76. GRB 240720A: Fermi GBM observation
  77. Swift GRB240720.02: Global MASTER-Net observations report
  78. Konus-Wind detection of GRB 240718A
  79. Fermi GRB 240718A: Global MASTER-Net observations report
  80. LAT GRB240718.27: Global MASTER-Net observations report
  81. GRB 240718A: Fermi GBM Observation
  82. IceCube-Cascade 240714A: TRT optical observations on the EP/FXT positions
  83. GRB 240718A: Fermi-LAT Detection
  84. GRB 240718A: SVOM/GRM observation
  85. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  86. GRB 240718A: Fermi GBM Final Real-time Localization
  87. GRB 240712A: Swift-BAT refined analysis
  88. GRB 240716A: GECAM-B detection of a long burst
  89. SVOM/GRM In-Flight Trigger of GRB 240716A
  90. IceCube-Cascade 240714A: X-ray follow-up observation with EP-FXT
  91. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  92. GRB 240715A: Swift-XRT observations
  93. GRB 240715A: GECAM-C detection of a short burst
  94. Konus-Wind detection of GRB 240715A
  95. LIGO/Virgo/KAGRA S240716b: Updated Sky localization
  96. GRB 240713A: Swift-XRT observations
  97. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  98. SVOM/GRM In-Flight Trigger of GRB 240715A
  99. GRB 240713A: LAST optical upper limit
  100. LIGO/Virgo/KAGRA S240716b: Identification of a GW compact binary merger candidate

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