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"
  1. Optical Observations of GRB981226
  2. GRB 981220:Optical Observations
  3. GRB 981220 optical R and I observations
  4. GRB981226, BeppoSAX Christmas GRB
  5. GRB 981226 - Infrared Observations
  6. GRB 981226 optical observations
  7. GRB 981220
  8. GRB 981220, radio observations
  9. GRB981226 Optical Observation
  10. GRB 981220, radio observations
  11. GRB 981220: BeppoSAX/GRBM results
  12. GRB981220 I-band Observations
  13. GRB981220 Optical Observations
  14. GRB 981220
  15. GRB 981220 Optical Observations
  16. GRB 981220, optical observations
  17. GRB 980326/Host Galaxy
  18. GRB981220 IPN error box
  19. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  20. BeppoSAX NFI Observation of GRB980425
  21. GRB980329 R,I flux calibration and R,I,K upper limits
  22. GRB980425 Optical Follow-up
  23. GRB980425: X-ray revised positions
  24. GRB 980923 BATSE Observations
  25. SGR1900+14, BeppoSAX-GRBM observations
  26. GRB980703 Very Long Baseline Interferometry
  27. GRB970508 optical observations
  28. GRB971214, association with a Galactic star?
  29. Optical Observations of the Host Galaxy of GRB 980519
  30. GRB980519, Optical Observations
  31. GRB980703, Host galaxy multicolor photometry
  32. GRB980703 - BeppoSAX/GRBM detection
  33. GRB 980703 (NFI observations)
  34. GRB980703 optical photometry
  35. GRB 980703: BATSE Observations
  36. GRB980703 optical observations
  37. GRB980703: Radio transient
  38. GRB980703 H-band Observations
  39. GRB 980703: Spectrum of the proposed optical counterpart
  40. RXTE Observation of GRB 980706
  41. GRB980703: Spectrum of the proposed optical counterpart
  42. GRB980703 Transient Optical Follow-Up
  43. GRB980703: LOTIS observation at early times
  44. GRB980613 Optical Observations
  45. GRB 980703
  46. GRB980703 (I band observations)
  47. GRB 980703 H-band Observations
  48. GRB980703 (optical R observations)
  49. GRB980706
  50. GRB980703: radio source/optical transient
  51. BeppoSAX NFI observations of GRB 980703
  52. GRB 980703: ASM Position & Intensity
  53. GRB980703
  54. GRB980519 observation report
  55. GRB980703 optical followup
  56. SGR1627-41
  57. Radio observations of SGRs
  58. SGR1900+14 field optical observations
  59. GRB 980613 Near-IR observations
  60. GRB980613, optical observations
  61. GRB 980613: Optical transient and its host galaxy
  62. SGR1627-41, RXTE/ASM observations
  63. SGR1627-41, Refined IPN annulus location
  64. GRB 980613: Detection of the probable host galaxy
  65. Reduced error box of SGR 1627-41
  66. GRB 980613: BATSE Observations
  67. SGR1627-41, BeppoSAX-GRBM detections
  68. SGR 1627-41
  69. GRB 980613 Optical Observations
  70. GRB 980613 optical observations
  71. Discovery of a new SGR source, SGR1627-41
  72. GRB980613 Optical Observations
  73. GRB980613 observations from Palomar
  74. GRB980613 BeppoSAX-NFI follow up
  75. GRB 980613 new optical/IR observations
  76. GRB 980613 optical/IR obs.
  77. GRB980613 Near Infra-Red Observations
  78. GRB980611
  79. GRB980613, BeppoSAX WFC positions
  80. GRB971214 Secondary Standards
  81. SGR 1900+14
  82. GRB980519 Secondary Standards
  83. SGR1900+14
  84. SGR1900+14
  85. BATSE on-board GRB trigger change
  86. GRB 980519 Optical Observations
  87. GRB980519 optical observations
  88. GRB980519 I-band observations
  89. GRB 980519
  90. GRB980519 optical observations
  91. GRB 980519 Optical Observations
  92. GRB980519 BATSE Observations
  93. GRB970519, optical follow-up at Schmidt Calern
  94. GRB980519 optical observations
  95. GRB980519 Optical Observations
  96. GRB980519 Optical Observations
  97. GRB980519 IPN POSITION
  98. GRB980519 Optical Observations
  99. GRB 980519 Optical Observations
  100. GRB980519 optical observations

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