Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

32419 results found.

  1. GRB980519, Optical Observations
  2. GRB980703, Host galaxy multicolor photometry
  3. GRB980703 - BeppoSAX/GRBM detection
  4. GRB 980703 (NFI observations)
  5. GRB980703 optical photometry
  6. GRB 980703: BATSE Observations
  7. GRB980703: Radio transient
  8. GRB980703 H-band Observations
  9. GRB 980703: Spectrum of the proposed optical counterpart
  10. RXTE Observation of GRB 980706
  11. GRB980703: Spectrum of the proposed optical counterpart
  12. GRB980703 Transient Optical Follow-Up
  13. GRB980703: LOTIS observation at early times
  14. GRB980613 Optical Observations
  15. GRB 980703
  16. GRB 980703 H-band Observations
  17. GRB980703 (optical R observations)
  18. GRB980706
  19. GRB980703: radio source/optical transient
  20. BeppoSAX NFI observations of GRB 980703
  21. GRB 980703: ASM Position & Intensity
  22. GRB980703
  23. GRB980703 optical followup
  24. GRB 980613 Near-IR observations
  25. GRB980613, optical observations
  26. GRB 980613: Optical transient and its host galaxy
  27. GRB 980613: Detection of the probable host galaxy
  28. GRB 980613: BATSE Observations
  29. GRB 980613 Optical Observations
  30. GRB 980613 optical observations
  31. GRB980613 Optical Observations
  32. GRB980613 observations from Palomar
  33. GRB980613 BeppoSAX-NFI follow up
  34. GRB 980613 new optical/IR observations
  35. GRB 980613 optical/IR obs.
  36. GRB980613 Near Infra-Red Observations
  37. GRB980611
  38. GRB980613, BeppoSAX WFC positions
  39. GRB971214 Secondary Standards
  40. GRB980519 Secondary Standards
  41. BATSE on-board GRB trigger change
  42. GRB 980519 Optical Observations
  43. GRB980519 optical observations
  44. GRB 980519
  45. GRB980519 optical observations
  46. GRB 980519 Optical Observations
  47. GRB980519 BATSE Observations
  48. GRB970519, optical follow-up at Schmidt Calern
  49. GRB980519 optical observations
  50. GRB980519 Optical Observations
  51. GRB980519 Optical Observations
  52. GRB980519 IPN POSITION
  53. GRB980519 Optical Observations
  54. GRB 980519 Optical Observations
  55. GRB980519 optical observations
  56. GRB980515, BeppoSAX IAUC to be submitted
  57. BATSE on-board GRB trigger change
  58. BeppoSAX GRB ALERT: updated position of grb980515
  59. GRB 980425 Radio Light Curve
  60. GRB 980425 Brightness Temperature
  61. GRB980425 BATSE observations
  62. SAX J0840.7+2248 Optical Observations
  63. GRB 980425 optical observations
  64. GRB980425: optical obs.
  65. GRB980425: Radio Observations
  66. GRB 980425 optical observations
  67. GRB 980425 optical observations
  68. GRB 980329 ROSAT observation
  69. GRB980326 X-ray Observations
  70. GRB980326, optical observations
  71. GRB980326, optical observations
  72. GRB980329, Fading IR counterpart to radio source
  73. GRByymmdd, Announcement of automation
  74. GRB980326 IPN annulus
  75. GRB980329 sub-millimeter observations
  76. GRB980329 IPN annulus
  77. GRB980329 near-IR observations
  78. GRB980326 optical observations
  79. GRB980329 optical observations
  80. GRB980329 VLA observations
  81. GRB980329 near IR observations
  82. GRB980329 optical observations
  83. GRB980329 optical observations
  84. GRB980326 optical observations
  85. GRB980326 optical observations
  86. GRB970508 SAO RAS optical observations
  87. Optical Observations of GRB 970508
  88. GRB 971214: Redshift from Keck Observations
  89. Near-IR follow-up on GRB 971227
  90. GRB971214: Keck R & I-band Observations
  91. GRB 971227: Optical Observations
  92. Optical Observations of the GRB 971227 field
  93. Optical Observations on GRB 971227
  94. GRB971227: Plaskett R-band observations
  95. GRB 971227: Optical clarifications
  96. Optical Observations for GRB 971227
  97. GRB971227: Further CAHA R-band images
  98. GRB971227: LOTIS observations
  99. GRB 971227: CAHA R-band images
  100. GRB 971227: 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