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"

19647 results found.

  1. GRB 261011A: 1.3m DFOT optical upper limit
  2. GRB 261010A: Pan-STARRS z-band imaging and upper limit
  3. GRB 261010A: LBT tentative near-infrared detection
  4. GRB 261010A: Glowbug gamma-ray detection
  5. GRB 261011A: Later-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  6. GRID detection of GRB 261010A
  7. GRB 261011A: GECAM-B observation
  8. GRB 261010A: J-band upper limit by the SYSU 80cm infrared telescope
  9. GRB 261010A: Swift-XRT refined Analysis
  10. GRB 261011A: Swift-XRT refined Analysis
  11. GRB 261011A: Enhanced Swift-XRT position
  12. GRB 261011A: 10.4m GTC spectroscopic redshift (z = 2.407)
  13. GRB 261011A: Swift-BAT refined analysis
  14. GRB 261010A: 10.4m GTC spectroscopy of the galaxy 2" from the afterglow
  15. GRB 261011A: REM optical/NIR observations
  16. Konus-Wind detection of GRB 261010A
  17. Konus-Wind detection of GRB 261011A
  18. GRB 261011A: SOAR optical afterglow observations at ~17 hours
  19. GRB 261010A: Swift-BAT refined analysis
  20. GRB 261011A : MITSuME Akeno optical afterglow candidate detection
  21. GRB 261011A: Optical followup from Sichuan South Observatory
  22. GRB 261011A: GMG Optical Observation
  23. GRB 261011A: Liverpool Telescope optical observations
  24. GRB 261011A: J-band observations by the SYSU 80cm infrared telescope
  25. GRB 261010A: NOT confirmation of the optical afterglow
  26. GRB 261010A: Fermi GBM Observation
  27. GRB 261011A: continued LCO optical observations
  28. GRB 261011A: GROWTH-India Telescope optical observations
  29. GRB 261011A: Luminance-band upper limit from a 28cm telescope in Chengde
  30. Swift GRB 261011A: Global MASTER-Net observations report
  31. GRB 261011A: Optical follow-up observations with Kinder
  32. GRB 261011A: SVOM/VT optical observation from VHF data
  33. GRB 261011A: LCO optical observations
  34. GRB 261011A: TRT optical afterglow detection
  35. GRB 261011A: GOTO optical counterpart detection
  36. GRB 261011A: Swift detection of an unusual burst
  37. GRB 261010A: Enhanced Swift-XRT position
  38. GRB 261010A: possible optical afterglow detected with the 1.5m OSN
  39. GRB 261010A: NOT possible optical counterpart
  40. GRB 261010A: Swift detection of a burst
  41. EP261006a: Swift/XRT detection of the fading X-ray counterpart
  42. GRB 261007A: Swift-XRT afterglow detection
  43. GRB 261007A: Swift ToO observations
  44. GRB 261005B: Swift-BAT refined analysis
  45. GRB 261005B: Swift-XRT refined Analysis
  46. GRB 261005B: Swift/UVOT Upper Limits
  47. GRB 261005B: J-band upper limit with WINTER
  48. GRB 261005B: Fermi GBM Observation
  49. GRB 261005B: Enhanced Swift-XRT position
  50. GRB 261005B: Swift detection of a burst
  51. EP#01709320865: Swift-XRT observations
  52. Trigger_21915: Swift ToO observations (retracted)
  53. GRB 260924A: Swift/UVOT UV grism spectrum results
  54. GRB 260925A: Swift-BAT refined analysis
  55. Swift Trigger 1513439: consistent with noise and not astrophysical
  56. GRB 260924A: COLIBRÍ optical observations
  57. GRB 260924A: Second-epoch J-band upper limit from the SYSU 80 cm infrared telescope
  58. GRB 260925A: Swift-XRT refined Analysis
  59. Swift Trigger 1513439 is probably not a GRB
  60. GRB 260925A: Swift/UVOT Upper Limits
  61. Konus-Wind detection of GRB 260924A
  62. GRB 260922A: Glowbug gamma-ray detection
  63. GRB 260925A: Enhanced Swift-XRT position
  64. GRB 260925A: COLIBRÍ optical upper limits
  65. GRB 260925A: FRAM-Auger optical limit
  66. GRB 260924A: Ondrejov D50 optical afterglow detection
  67. GRB 260924A: SVOM/GRM observation
  68. GRB 260924A: 2.2m CAHA spectroscopic redshift z = 3.51
  69. GRB 260925A: Swift detection of a burst
  70. GRB 260924A: J-band observations by the SYSU 80 cm infrared telescope
  71. GRB 260924A: Swift/UVOT Detection
  72. GRB 260924A: Swift-BAT refined analysis
  73. GRB 260924A: NuSTAR detection of prompt emission
  74. GRB 260924A: Swift/UVOT Upper Limits
  75. GRB 260924A: Swift-XRT refined Analysis
  76. Konus-Wind detection of GRB 260922A
  77. GRB 260922A: NuSTAR detection of prompt emission
  78. GRB 260921A: NuSTAR detection of prompt emission
  79. GRB 260921A: SVOM/GRM observation
  80. GRB 260922A: COLIBRÍ Confirmation of the Optical Counterpart
  81. GRB 260924A: Fermi GRB Observation
  82. Konus-Wind detection of GRB 260921A (possible merger-origin)
  83. GRB 260924A: Fermi-LAT detection of a bright burst
  84. GRB 260924A: AstroSat CZTI detection
  85. GRB 260924A: NOT optical counterpart confirmation
  86. GRB 260924A: detection of a bright optical afterglow by the 1.5m OSN telescope
  87. GRB 260922A: CALET Gamma-Ray Burst Monitor detection
  88. GRB 260924A: Enhanced Swift-XRT position
  89. GRB 260924A: Swift detection of a burst
  90. Trigger_21914: Swift ToO observations (retracted)
  91. GRB 260922A: Ondrejov D50 optical limit
  92. GRB 260922A: Swift-BAT refined analysis
  93. GRB 260922A: Swift/UVOT Upper Limits
  94. GRB 260922A: COLIBRÍ Optical Counterpart Candidate (correction to GCN 45698)
  95. GRB 260922A: COLIBRÍ optical upper limits
  96. GRB 260922A: Swift-XRT refined Analysis
  97. GRB 260922A: Enhanced Swift-XRT position
  98. Fermi-LAT Gamma-ray Observations of IceCube-260805A
  99. GRB 260922A: SVOM/C-GFT optical upper limit
  100. GRB 260922A: Swift detection of a burst

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