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"

42744 results found.

  1. GRB000604 [IPN Position]
  2. GRB000528, Radio Observations
  3. X-ray Afterglow of GRB 000529
  4. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  5. GRB000529: Optical Observations
  6. IPN localization and time history of GRB000528
  7. New IPN localization of GRB000529
  8. GRB000519: Optical observations
  9. IPN localization of GRB000529
  10. GRB 000528 - WFC measurements
  11. GRB000529: BeppoSAX WFC position
  12. GRB000528: BeppoSAX GRBM observations
  13. GRB 000528 Optical Observations
  14. GRB000519, BVRI field photometry
  15. IPN triangulation of GRB000519
  16. IPN triangulation of GRB000516
  17. Re: GRB000508B : Optical observations
  18. GRB 000418, Optical observation
  19. GRB000508B, optical photometry
  20. GRB000508B, BVR field photometry
  21. Possible GRB-related phenomenon
  22. RXTE/ASM and IPN localization of GRB 000508B
  23. GRB000424, UBVRI field photometry
  24. GRB 000424 Optical Observations
  25. GRB000418, UBVRI field photometry update
  26. The redshift of GRB 000418
  27. GRB000424, optical observations
  28. GRB 000429, optical observation
  29. GRB 000429, UBVRI field photometry
  30. IPN localization of GRB000429
  31. GRB 000418, UBVRI field photometry
  32. GRB000418, Radio detection
  33. GRB000418, K'-band photometry
  34. GRB 000418, optical observation
  35. GRB000424 Optical Observations
  36. GRB 000418, Optical Observation
  37. GRB000424, optical observations
  38. GRB000424, optical observations
  39. GRB 000424, Optical Observations
  40. GRB000418, near-infrared observations
  41. BeppoSAX GRB000424
  42. Correction to IPN error box for GRB000419
  43. IPN error box for GRB000418
  44. GRB000419 [IPN Position]
  45. GRB000416 Optical Observations
  46. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  47. GRB000416 BRJK observations
  48. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  49. GRB 000408, optical observations
  50. Refined IPN error box for GRB000408
  51. GRB 991208, UBVRI field photometry
  52. GRB000301c results
  53. GRB000408: Optical CCD Observations from MIRO
  54. GRB000408, lotis optical observations
  55. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  56. GRB000408 [IPN Position]
  57. GRB000326 Optical Observations
  58. GRB000301C - R magnitude lower limit
  59. GRB 000323, optical observations
  60. GRB 000326: Optical Observations
  61. GRB000326, Radio observations
  62. GRB000326 [IPN Position]
  63. GRB 000307 optical observations
  64. GRB000323 [IPN Position]
  65. Single error box for GRB000315
  66. GRB000315 [IPN Positions]
  67. GRB000313, Radio observations
  68. GRB 000313 - optical transient in the BATSE error box
  69. GRB000301C - B and R photometry
  70. GRB000301C - R photometry
  71. GRB 000307, Optical Observations
  72. GRB 000307, BVRI Field Photometry
  73. GRB 000301C: Optical Spectrum and Redshift
  74. GRB 000301C: Optical Spectrum and Redshift
  75. GRB 000301C: A Precise Redshift Determination
  76. GRB 000301C, Optical Observation
  77. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  78. GRB 000301C: HST/STIS CCD Imaging of the field
  79. IPN error box for GRB000307
  80. GRB 000301c: K' observations
  81. GRB000301C, optical R-band observations
  82. GRB000301c - R photometry and nearby faint source confirmation
  83. GRB 000301C, Optical Observation
  84. GRB 000301c: K' observations
  85. GRB 000301C Optical Observations
  86. GRB 000301C: K' Observations
  87. GRB000301C OT candidate optical observations
  88. GRB000301C - Host galaxy not detected in R (?)
  89. Optical observations of GRB000301c
  90. GRB000301C, Radio observations
  91. GRB000301C, Radio observations
  92. GRB000301C optical observations
  93. GRB000301C, near-infrared observations (JHK' imaging)
  94. GRB 000301c near-IR observations
  95. GRB 000301C, Optical Color
  96. GRB000301C, Optical Spectroscopy
  97. GRB 000301C, UBVRI field photometry
  98. GRB 000301C, Optical Observation
  99. GRB000301C, optical observations
  100. GRB000301C 250 GHz detection

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