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"

28233 results found.

  1. EP260514a: SVOM/VT optical candidate
  2. Fermi GRB 260516B: Global MASTER-Net observations report
  3. GRB 260515A: OHP/T193 optical observations
  4. EP260514a: COLIBRÍ optical upper limits
  5. GRB 260515A: LCO optical observations
  6. SVOM GRB 260515A: Global MASTER-Net observations report
  7. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  8. GRB 260515A: SVOM/VT optical candidate from VHF data
  9. GRB 260515A: JinShan optical counterpart candidate
  10. GRB 260515A: SVOM detection of a burst
  11. GRB 260510C: Glowbug gamma-ray detection
  12. EP260514a: GROWTH-India Telescope optical upper limit
  13. GRB 260511B: GMG Optical Upper Limit
  14. EP260514a: Global MASTER-Net observations report
  15. EP260514a: Einstein Probe detection of a fast X-ray transient
  16. EP260512a: LCO optical upper limits
  17. GRB 260511B: Mephisto multi-band optical followup
  18. Fermi GRB 260514A: Global MASTER-Net observations report
  19. GRB 260512A: AstroSat CZTI detection
  20. EP260512a: EP-FXT follow-up observation
  21. EP260507a: Xinglong Schmidt optical counterpart detection
  22. EP260512a: Global MASTER-Net observations report
  23. Fermi GRB 260513A: Global MASTER-Net observations report
  24. Fermi GRB 260512A: Global MASTER-Net observations report
  25. GRB 260511B: further SAO RAS optical observations
  26. GRB 260509A: SVOM/VT optical observations
  27. The EP-WXT trigger 01709262036 is likely a flaring star
  28. EP260512a: COLIBRÍ optical upper limits
  29. EP260512a: Einstein Probe detection of an X-ray transient
  30. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  31. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  32. GRB 260512A: NuSTAR detection of prompt emission
  33. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  34. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  35. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  36. GRB 260511A: Glowbug gamma-ray detection
  37. GRB 260511B: SAO RAS optical observations
  38. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  39. GRB 260511B: FRAM-ORM optical detection
  40. GRB 260511A: EP-FXT follow-up observation
  41. GRB 260511B: EP-FXT follow-up observation
  42. GRB 260511B: LCO optical counterpart detection
  43. GRB260511B: MAO/AZT-22 optical observations
  44. GRB 260511B: LCO optical observations
  45. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  46. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  47. GRB 260510B: EP-FXT follow-up observation
  48. GRB 260510C: Fermi GBM Observation
  49. GRB 260509A: SAO RAS optical observations
  50. GRB 260511A: REM near-infrared detection
  51. GRB 260511B: GROWTH-India Telescope optical observations
  52. GRB 260506B: Glowbug gamma-ray detection
  53. GRB 260506A: Glowbug gamma-ray detection of a short burst
  54. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  55. GRB 260511B: NuSTAR detection of prompt emission
  56. GRB 260511A: NuSTAR detection of prompt emission
  57. GRB 260511B: Fermi GBM Detection
  58. GRB 260511B: SVOM/VT optical observation with VHF data
  59. GRB 260511B: TRT optical observation
  60. GRB 260511B : MITSuME Akeno optical afterglow candidate detection
  61. GRB 260511A: Fermi GBM Detection
  62. GRB 260511B SVOM/C-GFT optical counterpart detection
  63. EP260509a: LCO optical upper limits
  64. GRB 260511A: UTGO H50 optical afterglow observation
  65. GRB 260511B: SVOM detection of a burst
  66. GRB 260510C: EP-FXT follow-up observation
  67. EP260509a: EP-FXT non-detection and upper limit
  68. GRB 260511A: SVOM/VT optical observation with VHF data
  69. Fermi GRB 260511A: Global MASTER-Net observations report
  70. GRB 260511A: KAIT optical afterglow observations
  71. GRB 260511A: LCO optical afterglow detection
  72. GRB 260511A: SVOM/COLIBRÍ (FM-GFT) optical counterpart
  73. GRB 260511A: TRT optical counterpart detection
  74. GRB 260511A: SVOM detection of a bright burst
  75. GRB 260511A: BALROG localization (Fermi Trigger 800172815 / GRB 260511259)
  76. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  77. GRB 260510C: MAXI/GSC detection
  78. EP260509a: Global MASTER-Net observations report
  79. Fermi GBM Sub-Threshold Detection of GRB 260510B
  80. GRB 260510C: SVOM detection of a burst
  81. GRB 260510B: LCO optical upper limits
  82. EP260509a: Einstein Probe detection of an X-ray transient
  83. GRB 260509A: Liverpool Telescope optical observations
  84. GRB 260510B: SVOM detection of a burst
  85. GRB 260509A: LCO optical observations
  86. SVOM GRB 260509A: MASTER-OAFA optical observation
  87. Fermi GRB 260510A: Global MASTER-Net observations report
  88. GRB 260509A: KAIT optical observations
  89. GRB 260509A: SVOM/COLIBRÍ (FM-GFT) observations
  90. GRB 260509A: SVOM/VT optical candidate with VHF data
  91. GRB 260509A: LCO optical counterpart detection
  92. GRB 260509A: SVOM detection of a burst
  93. IceCube-260504A: Upper limits from a search for additional neutrino events in IceCube
  94. EP260507a: REM optical/NIR observations
  95. EP260507a: refined analysis of the EP-WXT and EP-FXT observations
  96. GRB 260507B / EP260507a: Fermi-GBM Sub-Threshold Detection
  97. EP260507a: COLIBRÍ optical observations
  98. EP260507a: NOT optical observations
  99. EP260507a: further Liverpool Telescope observations
  100. EP260507a: Liverpool Telescope optical upper limits

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