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"

28134 results found.

  1. GRB 991208, UBVRI field photometry
  2. GRB000408, lotis optical observations
  3. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  4. GRB000301C - Addendum to GCN 623
  5. GRB 000323, optical observations
  6. GRB 000326: Optical Observations
  7. GRB000326, Radio observations
  8. GRB000313, Radio observations
  9. GRB 000313 - optical transient in the BATSE error box
  10. GRB 000307, Optical Observations
  11. GRB 000307, BVRI Field Photometry
  12. GRB 000301C: A Precise Redshift Determination
  13. GRB 000301C, Optical Observation
  14. GRB 000301C: HST/STIS CCD Imaging of the field
  15. IPN error box for GRB000307
  16. GRB000301C, optical R-band observations
  17. GRB 000301C Optical Observations
  18. GRB 000301C: K' Observations
  19. GRB000301C OT candidate optical observations
  20. GRB000301C - Host galaxy not detected in R (?)
  21. Optical observations of GRB000301c
  22. GRB000301C, Radio observations
  23. GRB000301C, Radio observations
  24. GRB000301C, near-infrared observations (JHK' imaging)
  25. GRB 000301c near-IR observations
  26. GRB 000301C, UBVRI field photometry
  27. GRB 000301C: OT confirmed
  28. GRB000301c optical observations
  29. GRB000301C, optical observations
  30. GRB000301C
  31. GRB 000301C : Optical Candidate
  32. GRB000301C: RXTE/ASM and IPN localizations
  33. GRB000226 [IPN Position]
  34. HST Observations of GRB 990712
  35. GRB 000214 near-IR observations
  36. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  37. GRB000210, Radio Observations
  38. GRB 000115, BVRI field photometry
  39. GRB000214: BeppoSAX GRBM and WFC Detection
  40. Optical observations of GRB000210
  41. GRB000210 X-ray afterglow
  42. GRB000214: X-ray afterglow candidate
  43. GRB000214 refined BeppoSAX-WFC position
  44. GRB 000210: BATSE Observations
  45. Optical observations of the Chandra X-ray source for GRB000210
  46. GRB000210, Radio Observations
  47. IPN triangulation of GRB000210
  48. GRB000210: possible afterglow detection with BeppoSAX NFI
  49. GRB000201, Radio Observations
  50. GRB000210: BeppoSAX GRBM and WFC Detection
  51. SAX_WFC_GRB_NOTICE
  52. SAX_WFC_GRB_NOTICE
  53. GRB000201 Optical Observations
  54. GRB 000201: TAROT optical observations
  55. GRB 991208, radio observations
  56. BATSE+IPN location of GRB000131
  57. IPN localization of GRB000131
  58. GRB 000126, optical observations
  59. BATSE Observations of GRB000115
  60. Second RXTE Observation of GRB 000115
  61. GRB991216, UBVRIJHK field photometry
  62. GCN resumes full operations
  63. GRB 991216 VLBA Observations
  64. GRB 991216: J band spectrophotometry
  65. GRB 991216: Detection of the Host and/or Absorber Galaxy
  66. IPN localization of GRB991226
  67. GRB 991216 RXTE ASM Observations
  68. GRB 991216: Updated BATSE parameters
  69. GRB 991217 (SAX J2303.2+0015) Optical observations
  70. Chandra observation of the X-ray afterglow of GRB991216
  71. GRB 991216, optical observations
  72. GRB 991216 Optical spectroscopy/imaging
  73. SAX J2303.2+0015 Optical observations
  74. IR observations of GRB991216
  75. GRB 991217 (SAX J2303.2+0015) Optical observations
  76. GRB991216 Optical and infrared observations of Beethoven Burst
  77. GRB 991216 Radio Observations
  78. GRB 991208 Keck Spectroscopy
  79. GRB 991208 Infrared Detection
  80. GRB991216
  81. GRB 991216--Summary of RXTE Observations
  82. GRB 991216 Optical Observations
  83. GRB 991216, optical observations
  84. GRB 991208 SAO-RAS Spectroscopy
  85. SAX J2303.2+0015: an x-ray/GRB?
  86. GRB 991216, Optical Transient
  87. GRB991216 ('Beethoven Burst') B, R, and K Observations
  88. GRB991216, infrared observations
  89. GRB 991208 optical observations
  90. GRB 991216 Optical Observation
  91. GRB 991216: Extremely bright BATSE burst
  92. R-band Observations of GRB991208 at TNG
  93. GRB991208, optical observations
  94. GRB 991208, Optical Observation
  95. GRB991208, optical observations
  96. GRB 991208 optical observations
  97. Optical Observations of GRB991105
  98. GRB991106: BeppoSAX/BATSE results
  99. GRB991106, near-infrared observations
  100. BeppoSAX NFI Observation of GRB991106

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