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"

28057 results found.

  1. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  2. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  3. GRB 000528 - WFC measurements
  4. GRB000519, BVRI field photometry
  5. IPN triangulation of GRB000519
  6. GRB000508B, optical photometry
  7. GRB000508B, BVR field photometry
  8. Possible GRB-related phenomenon
  9. RXTE/ASM and IPN localization of GRB 000508B
  10. GRB000424, UBVRI field photometry
  11. GRB000418, UBVRI field photometry update
  12. GRB000424, optical observations
  13. GRB 000429, optical observation
  14. GRB 000429, UBVRI field photometry
  15. GRB 000418, UBVRI field photometry
  16. GRB 000418, optical observation
  17. GRB 000418, Optical Observation
  18. GRB000418, near-infrared observations
  19. Correction to IPN error box for GRB000419
  20. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  21. GRB000416 BRJK observations
  22. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  23. GRB 000408, optical observations
  24. GRB 991208, UBVRI field photometry
  25. GRB000408, lotis optical observations
  26. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  27. GRB000301C - Addendum to GCN 623
  28. GRB 000323, optical observations
  29. GRB 000326: Optical Observations
  30. GRB000326, Radio observations
  31. GRB000313, Radio observations
  32. GRB 000313 - optical transient in the BATSE error box
  33. GRB 000307, Optical Observations
  34. GRB 000307, BVRI Field Photometry
  35. GRB 000301C: A Precise Redshift Determination
  36. GRB 000301C, Optical Observation
  37. GRB 000301C: HST/STIS CCD Imaging of the field
  38. IPN error box for GRB000307
  39. GRB000301C, optical R-band observations
  40. GRB 000301C Optical Observations
  41. GRB 000301C: K' Observations
  42. GRB000301C OT candidate optical observations
  43. GRB000301C - Host galaxy not detected in R (?)
  44. Optical observations of GRB000301c
  45. GRB000301C, Radio observations
  46. GRB000301C, Radio observations
  47. GRB000301C, near-infrared observations (JHK' imaging)
  48. GRB 000301c near-IR observations
  49. GRB 000301C, UBVRI field photometry
  50. GRB 000301C: OT confirmed
  51. GRB000301c optical observations
  52. GRB000301C, optical observations
  53. GRB000301C
  54. GRB 000301C : Optical Candidate
  55. GRB000301C: RXTE/ASM and IPN localizations
  56. GRB000226 [IPN Position]
  57. HST Observations of GRB 990712
  58. GRB 000214 near-IR observations
  59. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  60. GRB000210, Radio Observations
  61. GRB 000115, BVRI field photometry
  62. GRB000214: BeppoSAX GRBM and WFC Detection
  63. Optical observations of GRB000210
  64. GRB000210 X-ray afterglow
  65. GRB000214: X-ray afterglow candidate
  66. GRB000214 refined BeppoSAX-WFC position
  67. GRB 000210: BATSE Observations
  68. Optical observations of the Chandra X-ray source for GRB000210
  69. GRB000210, Radio Observations
  70. IPN triangulation of GRB000210
  71. GRB000210: possible afterglow detection with BeppoSAX NFI
  72. GRB000201, Radio Observations
  73. GRB000210: BeppoSAX GRBM and WFC Detection
  74. SAX_WFC_GRB_NOTICE
  75. SAX_WFC_GRB_NOTICE
  76. GRB000201 Optical Observations
  77. GRB 000201: TAROT optical observations
  78. GRB 991208, radio observations
  79. BATSE+IPN location of GRB000131
  80. IPN localization of GRB000131
  81. GRB 000126, optical observations
  82. BATSE Observations of GRB000115
  83. Second RXTE Observation of GRB 000115
  84. GRB991216, UBVRIJHK field photometry
  85. GCN resumes full operations
  86. GRB 991216 VLBA Observations
  87. GRB 991216: J band spectrophotometry
  88. GRB 991216: Detection of the Host and/or Absorber Galaxy
  89. IPN localization of GRB991226
  90. GRB 991216 RXTE ASM Observations
  91. GRB 991216: Updated BATSE parameters
  92. GRB 991217 (SAX J2303.2+0015) Optical observations
  93. Chandra observation of the X-ray afterglow of GRB991216
  94. GRB 991216, optical observations
  95. GRB 991216 Optical spectroscopy/imaging
  96. SAX J2303.2+0015 Optical observations
  97. IR observations of GRB991216
  98. GRB 991217 (SAX J2303.2+0015) Optical observations
  99. GRB991216 Optical and infrared observations of Beethoven Burst
  100. GRB 991216 Radio Observations

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