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"

36346 results found.

  1. GRB 241024A: Fermi GBM Final Localisation
  2. EP241021a: VLT/FORS2 redshift z = 0.75
  3. EP241021a: SAO RAS optical observations
  4. EP241021a: KAIT optical observations
  5. IPN triangulation of GRB 241021A (long)
  6. GRB 241018A: SVOM/C-GFT optical observations
  7. GRB241017A: 1.3m DFOT optical upper limit
  8. GRB 241018A: 1.3m DFOT Optical upper limit
  9. GRB 241018A: EP-FXT afterglow detection
  10. Konus-Wind detection of GRB 241018A
  11. GRB 241018A: SVOM/GRM observation
  12. GRB 241018A/sb24101802: Mephisto optical upper limit
  13. GRB 241017A/sb24101702: Mephisto optical upper limit
  14. GRB 241018A: BOOTES-4/MET optical upper limit
  15. GRB 241018A: Mondy optical upper limit
  16. GRB 241018A: SVOM/VT further analysis and counterpart confirmed
  17. GRB 241018A: GROWTH-India telescope optical upper limit
  18. GRB 241018A: Swift-XRT observations
  19. GRB 241018A: REM optical/NIR upper limits
  20. GRB 241018A: NOT optical observations
  21. GRB 241017A: SVOM/VT follow-up and optical upper limit
  22. GRB 241018A: SVOM/VT follow-up and optical candidate
  23. GRB 241018A: LCO/0.4m optical upper limits
  24. GRB 241018A: Swift ToO observations
  25. GRB 241006A: VIRT Optical Upper Limit
  26. GRB 240727A: VIRT Optical Upper Limit
  27. GRB 241018A: X-ray afterglow candidate observed by MXT
  28. GRB 241016B: Fermi GBM Observations
  29. GRB 241018A: Detection of a bright long GRB by SVOM
  30. GRB 241017A: Swift-XRT observations
  31. GRB 241001A: EP-FXT afterglow detection
  32. GRB 241017A: GROWTH-India Telescope optical upper limit
  33. GRB 241016B: Swift/BAT-GUANO localization skymap of a short burst
  34. GRB 241017A: J-band upper limit from WINTER
  35. GRB 241016B: SVOM/GRM observation
  36. GRB241016C: Fermi GBM Final Localization
  37. Fermi Gamma-ray Burst Monitor trigger 750792698/241016730 is not a GRB
  38. GRB 241017A: Swift ToO observations
  39. GRB 241017A : Detection of a weak and soft long duration GRB by SVOM/ECLAIRs
  40. Fermi GRB 241016B: Global MASTER-Net observations report
  41. GRB 241016B: Fermi GBM Final Localization
  42. Fermi GRB 241016A: Global MASTER-Net observations report
  43. GRB 241016A: Fermi GBM Final Real-time Localization
  44. GRB 241010A: Swift-BAT refined analysis
  45. GRB 241013B: Fermi GBM Observation
  46. GRB 241013B: Swift/BAT-GUANO localization skymap of a burst
  47. GRB 241013A: Fermi GBM Observation
  48. GRB 240916A: radio detection with the VLA
  49. GRB241013A: REM observations
  50. GRB 241009A: LCO optical upper limits
  51. GRB 241013B: SVOM/GRM observation
  52. Fermi GRB 241013B: Global MASTER-Net observations report
  53. GRB 241013B: Fermi GBM Final Real-time Localization
  54. GRB 241013A: a long GRB detected by INTEGRAL
  55. GRB 241013A: Fermi GBM Final Real-time Localization
  56. Fermi Gamma-ray Burst Monitor GRB trigger 750372658/241011869 (GRB 241011A) is not a GRB
  57. GRB 241011A: Fermi GBM Final Real-time Localization
  58. GRB 241009A: GRANDMA optical upper limits
  59. GRB 241009A: Swift-XRT afterglow detection
  60. GRB 241010A: JinShan optical observations and potential host galaxy
  61. GRB 241006A: ATCA Radio Upper Limits
  62. GRB 241010A: Swift-XRT refined Analysis
  63. Fermi Gamma-ray Burst Monitor trigger 750303285/241011066 is not a GRB
  64. Fermi Gamma-ray Burst Monitor trigger 750291012/241010924 is not a GRB
  65. Swift GRB 241010A: Global MASTER-Net observations report
  66. GRB 241010A: J-band observations with WINTER
  67. Fermi GRB 241010B: Global MASTER-Net observations report
  68. GRB 241010B: Fermi GBM Final Real-time Localization
  69. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  70. GRB 241010A: Enhanced Swift-XRT position
  71. GRB 241010A: LCO optical observations
  72. GRB 241010A: Swift detection of a burst with an optical counterpart
  73. GRB 241006A: Swift-BAT refined analysis
  74. GRB 241009A: Swift ToO observations
  75. GRB 241009A : Detection of a long duration GRB by SVOM/ECLAIRs
  76. GRB 241008A: Fermi GBM Observation
  77. GRB 241008A: Fermi-LAT detection
  78. GRB 241002B: Swift-XRT afterglow detection
  79. GRB 241002A: NOT optical upper limits
  80. Fermi GRB 241008A: Global MASTER-Net observations report
  81. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  82. GRB 241008A: Fermi GBM Final Real-time Localization
  83. GRB 241006A: GRANDMA optical upper limits
  84. EP240930a / GRB 240930B: CrAO ZTSH optical upper limit
  85. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  86. GRB 240910A: LBT optical observations
  87. EP trigger ID 01709065118: KAIT confirmation of the stellar flare
  88. GRB 241006A: Swift-XRT refined Analysis
  89. GRB 240821A: Host galaxy redshift from VLT/X-shooter
  90. GRB 241006A: PRIME near-infrared upper limits
  91. GRB 241006A: Swift/UVOT Upper Limits
  92. GRB 241006A: SVOM/VT follow-up and optical upper limit
  93. GRB 241001A: Swift-XRT afterglow detection
  94. GRB 241006A: Enhanced Swift-XRT position
  95. GRB 241006A: Swift detection of a burst
  96. GRB 240930B: SVOM/C-GFT optical upper limit
  97. GRB 241004A: SVOM/GRM observation
  98. GRB 240930B / EP 240930a: SVOM/GRM observation
  99. GRB 241001A : ECLAIRs spectral analysis and XRF classification
  100. GRB 241002B: PRIME near-infrared detection in 2nd epoch

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