Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19549 results found.

  1. GRB000301C, optical R-band observations
  2. GRB 000301C Optical Observations
  3. GRB 000301C: K' Observations
  4. GRB000301C - Host galaxy not detected in R (?)
  5. Optical observations of GRB000301c
  6. GRB000301C, Radio observations
  7. GRB000301C, Radio observations
  8. GRB 000301c near-IR observations
  9. GRB 000301C, UBVRI field photometry
  10. GRB000301C, near-infrared observations (JHK' photometry)
  11. GRB 000301C: OT confirmed
  12. GRB000301c optical observations
  13. GRB000301C
  14. GRB 000301C : Optical Candidate
  15. HST Observations of GRB 990712
  16. GRB 000214 near-IR observations
  17. GRB 000214, Radio Observations
  18. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  19. GRB000210, Radio Observations
  20. GRB 000115, BVRI field photometry
  21. GRB000214: BeppoSAX GRBM and WFC Detection
  22. Optical observations of GRB000210
  23. GRB000210 X-ray afterglow
  24. GRB000214: X-ray afterglow candidate
  25. GRB000214 refined BeppoSAX-WFC position
  26. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  27. Correction to Chandra Position of GRB000210 afterglow
  28. Optical observations of the Chandra X-ray source for GRB000210
  29. GRB000210, Radio Observations
  30. GRB000210: possible afterglow detection with BeppoSAX NFI
  31. GRB000201, Radio Observations
  32. GRB000210: BeppoSAX GRBM and WFC Detection
  33. GRB000201 Optical Observations
  34. GRB 000126, optical observations
  35. IPN localization of GRB000126
  36. IPN annulus for GRB000115
  37. GRB991216, UBVRIJHK field photometry
  38. GCN resumes full operations
  39. GRB 991216: Detection of the Host and/or Absorber Galaxy
  40. GRB 991216 RXTE ASM Observations
  41. GRB 991217 (SAX J2303.2+0015) Optical observations
  42. Chandra observation of the X-ray afterglow of GRB991216
  43. SAX J2303.2+0015 Optical observations
  44. IR observations of GRB991216
  45. GRB 991217 (SAX J2303.2+0015) Optical observations
  46. GRB 991216 Radio Observations
  47. GRB 991208 Infrared Detection
  48. GRB991216
  49. GRB 991216--Summary of RXTE Observations
  50. GRB 991216 Optical Observations
  51. GRB 991216, optical observations
  52. GRB 991208 SAO-RAS Spectroscopy
  53. SAX J2303.2+0015: an x-ray/GRB?
  54. GRB 991216, Optical Transient
  55. GRB991216 ('Beethoven Burst') B, R, and K Observations
  56. GRB991216, infrared observations
  57. GRB 991208 optical observations
  58. GRB 991216 Optical Observation
  59. GRB 991216: Extremely bright BATSE burst
  60. R-band Observations of GRB991208 at TNG
  61. GRB991208, optical observations
  62. GRB 991208, Optical Observation
  63. GRB991208, optical observations
  64. IPN localization of GRB991208
  65. Optical Observations of GRB991105
  66. GRB991106: BeppoSAX/BATSE results
  67. BeppoSAX NFI Observation of GRB991106
  68. GRB 991106, radio observations
  69. GRB991106: the first BeppoSAX short GRB detection?
  70. GRB 991106 Optical Observations
  71. GRB991106, optical observation at SAO-RAS
  72. GRB 991106, LOTIS Optical Observations
  73. GRB991105: SAX-GRBM/-WFC detection
  74. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  75. GRB 991014, Optical Observations
  76. GRB 991014 - BeppoSAX NFI observations
  77. GRB 991014, radio observations
  78. GRB 991014, Optical Observations
  79. GRB 991014, optical observations
  80. Optical Observations of GRB990907
  81. GRB990907: BeppoSAX follow up and X-ray afterglow
  82. GRB990907 and 990908
  83. GRB990908, another BeppoSAX-GRBM/WFC burst detection
  84. BeppoSAX MAIL n. 99/24: GRB ALERT: GRB990907
  85. GRB990806 BeppoSAX follow up
  86. GRB 990806 Optical observations
  87. GRB 990806, optical observations
  88. GRB 990806, Optical Observations
  89. GRB990806: possible X-ray afterglow, BeppoSAX
  90. GRB 990712 Optical Observations
  91. GRB 990712
  92. Late-time HST/STIS Observations of GRB 990510
  93. BeppoSAX NFI Observation of GRB990705
  94. BeppoSAX NFI Observation of GRB990705
  95. GRB 990705, R-band observations
  96. GRB990704: SAX-NFI results summary
  97. GRB990704 radio and optical observations
  98. GRB990704
  99. GRB990704, optical observations
  100. GRB990704: possible X-ray afterglow

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