Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

25839 results found.

  1. Search for Potential Images of GRB 990123
  2. GRB990123, Optical BVRI Observations
  3. GRB 990123: near-infrared observations.
  4. GRB990123, OSSE observations
  5. GRB990123: NIR Observation
  6. GRB990123, ASCA X-ray observation of afterglow
  7. "GRB 990123: New BV Observations"
  8. GRB 990123 Optical Follow-Up
  9. GRB 990123: BATSE Observations
  10. GRB990123 IPN annulus
  11. GRB 990123 Spectroscopic Redshifts
  12. GRB 990123: New Optical Observations, Decay Measure
  13. GRB 990123 Optical Follow-Up
  14. GRB 990123: Possible Gravitationally Lensed Burst?
  15. GRB990123, optical observation
  16. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  17. GRB 990123, new radio source
  18. GRB990123, Optical observation
  19. GRB 990123 r-band photometry
  20. GRB 990123 Optical Follow-up
  21. GRB990123 Optical Observation
  22. GRB990123, refined SAX-WFC position
  23. Possible identification of SN1999E with GRB980910
  24. Optical Observations of GRB 981220
  25. GRB 981226: radio variable
  26. GRB981220
  27. GRB 981220 Optical observations
  28. GRB 981226 Optical Observations
  29. GRB981226 Optical Observations
  30. GRB981226 BeppoSAX follow up
  31. GRB 981226
  32. GRB 981226 optical observations
  33. Optical Observations of GRB981226
  34. GRB 981220:Optical Observations
  35. GRB 981226 optical observations
  36. GRB 981220
  37. GRB 981220, radio observations
  38. GRB 981220
  39. GRB 981220, optical observations
  40. GRB 980326/Host Galaxy
  41. GRB981220 IPN error box
  42. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  43. BeppoSAX NFI Observation of GRB980425
  44. GRB980329 R,I flux calibration and R,I,K upper limits
  45. GRB980425 Optical Follow-up
  46. GRB 980923 BATSE Observations
  47. GRB980703 Very Long Baseline Interferometry
  48. GRB970508 optical observations
  49. GRB980519, Optical Observations
  50. GRB980703 - BeppoSAX/GRBM detection
  51. GRB 980703 (NFI observations)
  52. GRB980703 optical photometry
  53. GRB 980703: BATSE Observations
  54. GRB980703 optical observations
  55. GRB980703: Radio transient
  56. GRB 980703: Spectrum of the proposed optical counterpart
  57. RXTE Observation of GRB 980706
  58. GRB980703 Transient Optical Follow-Up
  59. GRB980703: LOTIS observation at early times
  60. GRB980613 Optical Observations
  61. GRB 980703
  62. GRB980703 (optical R observations)
  63. BeppoSAX NFI observations of GRB 980703
  64. GRB 980703: ASM Position & Intensity
  65. GRB980703 optical followup
  66. Radio observations of SGRs
  67. SGR1900+14 field optical observations
  68. GRB 980613: Optical transient and its host galaxy
  69. SGR1627-41, RXTE/ASM observations
  70. GRB 980613: Detection of the probable host galaxy
  71. GRB 980613: BATSE Observations
  72. GRB 980613 Optical Observations
  73. GRB 980613 optical observations
  74. Discovery of a new SGR source, SGR1627-41
  75. GRB980613 Optical Observations
  76. GRB980613 observations from Palomar
  77. GRB980613 Near Infra-Red Observations
  78. GRB980613, BeppoSAX WFC positions
  79. GRB971214 Secondary Standards
  80. GRB980519 Secondary Standards
  81. SGR1900+14
  82. SGR1900+14
  83. BATSE on-board GRB trigger change
  84. GRB 980519 Optical Observations
  85. GRB 980519
  86. GRB980519 optical observations
  87. GRB 980519 Optical Observations
  88. GRB980519 BATSE Observations
  89. GRB980519 Optical Observations
  90. GRB 980519 Optical Observations
  91. GRB980519 optical observations
  92. GRB980515, BeppoSAX IAUC to be submitted
  93. BATSE on-board GRB trigger change
  94. GRB980519, BeppoSAX-WFC updated position
  95. BeppoSAX GRB ALERT: updated position of grb980515
  96. BSAX Observations of GRB980425 field
  97. IPN web site of GRBs
  98. GRB980425 BATSE observations
  99. SAX J0840.7+2248 Optical Observations
  100. GRB980425: optical obs.

Advanced

Download all Circulars as a .tar.gz archive:
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