Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

34033 results found.

  1. GRB981220 I-band Observations
  2. GRB 981220
  3. GRB 981220 Optical Observations
  4. GRB 981220, optical observations
  5. GRB 980326/Host Galaxy
  6. GRB981220 IPN error box
  7. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  8. GRB980329 R,I flux calibration and R,I,K upper limits
  9. GRB980425: X-ray revised positions
  10. GRB 980923 BATSE Observations
  11. GRB980703 Very Long Baseline Interferometry
  12. GRB970508 optical observations
  13. GRB971214, association with a Galactic star?
  14. Optical Observations of the Host Galaxy of GRB 980519
  15. GRB980519, Optical Observations
  16. GRB980703, Host galaxy multicolor photometry
  17. GRB980703 - BeppoSAX/GRBM detection
  18. GRB 980703 (NFI observations)
  19. GRB980703 optical photometry
  20. GRB 980703: BATSE Observations
  21. GRB980703: Radio transient
  22. GRB980703 H-band Observations
  23. GRB 980703: Spectrum of the proposed optical counterpart
  24. RXTE Observation of GRB 980706
  25. GRB980703: Spectrum of the proposed optical counterpart
  26. GRB980703 Transient Optical Follow-Up
  27. GRB980703: LOTIS observation at early times
  28. GRB980613 Optical Observations
  29. GRB 980703
  30. GRB 980703 H-band Observations
  31. GRB980703 (optical R observations)
  32. GRB980706
  33. GRB980703: radio source/optical transient
  34. BeppoSAX NFI observations of GRB 980703
  35. GRB 980703: ASM Position & Intensity
  36. GRB980703
  37. GRB980703 optical followup
  38. GRB 980613 Near-IR observations
  39. GRB980613, optical observations
  40. GRB 980613: Optical transient and its host galaxy
  41. GRB 980613: Detection of the probable host galaxy
  42. GRB 980613: BATSE Observations
  43. GRB 980613 Optical Observations
  44. GRB 980613 optical observations
  45. GRB980613 Optical Observations
  46. GRB980613 observations from Palomar
  47. GRB980613 BeppoSAX-NFI follow up
  48. GRB 980613 new optical/IR observations
  49. GRB 980613 optical/IR obs.
  50. GRB980613 Near Infra-Red Observations
  51. GRB980611
  52. GRB980613, BeppoSAX WFC positions
  53. GRB971214 Secondary Standards
  54. GRB980519 Secondary Standards
  55. BATSE on-board GRB trigger change
  56. GRB 980519 Optical Observations
  57. GRB980519 optical observations
  58. GRB 980519
  59. GRB980519 optical observations
  60. GRB 980519 Optical Observations
  61. GRB980519 BATSE Observations
  62. GRB970519, optical follow-up at Schmidt Calern
  63. GRB980519 optical observations
  64. GRB980519 Optical Observations
  65. GRB980519 Optical Observations
  66. GRB980519 IPN POSITION
  67. GRB980519 Optical Observations
  68. GRB 980519 Optical Observations
  69. GRB980519 optical observations
  70. GRB980515, BeppoSAX IAUC to be submitted
  71. BATSE on-board GRB trigger change
  72. BeppoSAX GRB ALERT: updated position of grb980515
  73. GRB 980425 Radio Light Curve
  74. GRB 980425 Brightness Temperature
  75. GRB980425 BATSE observations
  76. SAX J0840.7+2248 Optical Observations
  77. GRB 980425 optical observations
  78. GRB980425: optical obs.
  79. GRB980425: Radio Observations
  80. GRB 980425 optical observations
  81. GRB 980425 optical observations
  82. GRB 980329 ROSAT observation
  83. GRB980326 X-ray Observations
  84. GRB980326, optical observations
  85. GRB980326, optical observations
  86. GRB980329, Fading IR counterpart to radio source
  87. GRByymmdd, Announcement of automation
  88. GRB980326 IPN annulus
  89. GRB980329 sub-millimeter observations
  90. GRB980329 IPN annulus
  91. GRB980329 near-IR observations
  92. GRB980326 optical observations
  93. GRB980329 optical observations
  94. GRB980329 VLA observations
  95. GRB980329 near IR observations
  96. GRB980329 optical observations
  97. GRB980329 optical observations
  98. GRB980326 optical observations
  99. GRB980326 optical observations
  100. GRB970508 SAO RAS 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