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"

23700 results found.

  1. LAT GRB240828.62: Global MASTER-Net observations report
  2. GRB 240828A: AstroSat CZTI detection of a long burst
  3. Fermi GRB 240828A: Global MASTER-Net observations report
  4. Fermi trigger No 746438824: Global MASTER-Net observations report
  5. SVOM GRB 240821A: optical afterglow discovery
  6. GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
  7. GRB 240824A: GIT optical upper limit
  8. GRB 240825A: TNG optical photometry and spectroscopy
  9. GRB 240825A: NUTTelA-TAO / BSTI Optical Limits
  10. GRB 240825A: GMG Continued Optical Observation on the Second Night
  11. GRB 240825A: KAIT optical observations
  12. Konus-Wind detection of GRB 240825A (bright/long)
  13. GRB 240825A : MISTRAL/T193 OHP optical follow-up of the afterglow
  14. GRB 240825A: Swift/UVOT Detection
  15. GRB 240825A: REM detection of the optical/NIR afterglow
  16. GRB 240825A: Swift-XRT refined Analysis
  17. GRB 240825A: Montarrenti Observatory optical observations
  18. GRB 240825A: MASTER optical counterpart observation
  19. GRB 240825A: LCO optical observations
  20. GRB 240824B: KAIT optical upper limit
  21. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  22. GRB 240824B: Fermi GBM Observation
  23. Fermi GRB 240825A: Global MASTER-Net observations report
  24. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  25. GRB 240825A: GMG Optical Observation
  26. Swift GRB 240825A: Global MASTER-Net observations report
  27. GRB 240825A: Swift detection of a burst with a bright optical counterpart
  28. GRB 240824A: Swift-BAT refined analysis
  29. GRB 240824B: Swift-XRT afterglow detection
  30. GRB 240824A: Swift-XRT observations
  31. Fermi GRB 240824C: Global MASTER-Net observations report
  32. GRB 240824A: Swift/UVOT Upper Limits
  33. GRB 240824B: MAXI/GSC detection
  34. GRB240824A: GRANDMA/TAROT-TCA Upper Limit
  35. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  36. GRB 240824A: KAIT optical upper limit
  37. GRB 240824A: Swift detection of a burst
  38. Swift GRB240824.04: Global MASTER-Net observations report
  39. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  40. GRB 240821A: Colibri Optical Upper Limit
  41. GRB 240821A: Swift-XRT observations
  42. GRB 240821A: REM optical/NIR upper limits
  43. GRB 240821A: LCO optical observations
  44. GRB 240821A: GMG Optical Upper Limit
  45. Fermi GRB 240821A: Global MASTER-Net observations report
  46. Fermi trigger No 745964969: Global MASTER-Net observations report
  47. Fermi trigger No 745925274: Global MASTER-Net observations report
  48. Fermi trigger No 746019401: Global MASTER-Net observations report
  49. Fermi trigger No 745935375: Global MASTER-Net observations report
  50. GRB240821A: EIRSAT-1 GMOD Detection
  51. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  52. GRB 240821A: EP-FXT follow-up observation and afterglow candidates
  53. Fermi GRB 240821B: Global MASTER-Net observations report
  54. EP240801a: Keck/LRIS spectroscopic redshift confirmation
  55. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  56. Fermi trigger No 745866488: Global MASTER-Net observations report
  57. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  58. EP240820a: TRT optical upper limit
  59. EP240820a: EP detection of a fast X-ray transient
  60. GRB 240819A: KAIT optical upper limit
  61. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  62. Fermi trigger No 745873283: Global MASTER-Net observations report
  63. Fermi trigger No 745871958: Global MASTER-Net observations report
  64. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  65. GRB 240819A: X-ray follow-up observation with EP-FXT
  66. EP240816a: BOOTES-6/DPRT optical upper limit
  67. Integral GRB240816.79: Global MASTER-Net observations report
  68. IceCube-240721A: AT2023qqp and AT2024pge likely unrelated
  69. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  70. EP240816b: KAIT optical upper limit
  71. GRB 240814B: GRBAlpha detection
  72. Fermi trigger No 745501396: Global MASTER-Net observations report
  73. EP240816a: EP detection of a fast X-ray transient and follow-up observation
  74. EP EP240816b: Global MASTER-Net observations report
  75. EP240816b: TRT optical upper limit
  76. EP240816b: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  77. Fermi GRB 240814A: Global MASTER-Net observations report
  78. Fermi GRB 240814C: Global MASTER-Net observations report
  79. Fermi trigger No 745306088: Global MASTER-Net observations report
  80. Fermi GRB 240814B: Global MASTER-Net observations report
  81. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  82. Fermi trigger No 745220784: Global MASTER-Net observations report
  83. Konus-Wind detection of GRB 240811A
  84. Konus-Wind detection of GRB 240810A
  85. GRB 240809A : RAPAS follow-up observations
  86. IPN triangulation of GRB 240810A (short)
  87. GRB 240811A: Swift-BAT refined analysis
  88. GRB 240809A: Swift-BAT refined analysis
  89. GRB 240811A: Bassano Bresciano Observatory upper limit
  90. GRB 240811A: Swift/UVOT Upper Limits
  91. EP240801a: Assy-Turgen optical observations
  92. Fermi GRB 240810A: Global MASTER-Net observations report
  93. Konus-Wind detection of GRB 240809A
  94. Fermi trigger No 745057312: Global MASTER-Net observations report
  95. Swift GRB 240811A: Global MASTER-Net observations report
  96. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  97. GRB 240809A: Conclusive redshift from VLT
  98. GRB 240809A: KAIT optical observations
  99. GRB 240809B: MAXI/GSC detection
  100. GRB 240809A: Tentative redshift from NOT

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