Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

27030 results found.

  1. GRB 981226
  2. GRB 981226 optical observations
  3. radio observations of GRB 981226
  4. GRB981220 B, R and I band observations
  5. Optical Observations of GRB981226
  6. GRB 981220:Optical Observations
  7. GRB981226, BeppoSAX Christmas GRB
  8. GRB 981226 - Infrared Observations
  9. GRB 981220, radio observations
  10. GRB 981220, radio observations
  11. GRB981220 I-band Observations
  12. GRB981220 Optical Observations
  13. GRB 980326/Host Galaxy
  14. GRB981220 IPN error box
  15. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  16. BeppoSAX NFI Observation of GRB980425
  17. GRB980329 R,I flux calibration and R,I,K upper limits
  18. GRB980425 Optical Follow-up
  19. GRB980425: X-ray revised positions
  20. GRB 980923 BATSE Observations
  21. SGR1900+14, BeppoSAX-GRBM observations
  22. GRB980703 Very Long Baseline Interferometry
  23. GRB970508 optical observations
  24. GRB971214, association with a Galactic star?
  25. Optical Observations of the Host Galaxy of GRB 980519
  26. GRB980519, Optical Observations
  27. GRB980703, Host galaxy multicolor photometry
  28. GRB 980703 (NFI observations)
  29. GRB980703 optical photometry
  30. GRB 980703: BATSE Observations
  31. GRB980703 optical observations
  32. GRB980703: Radio transient
  33. GRB980703 H-band Observations
  34. RXTE Observation of GRB 980706
  35. GRB980703 Transient Optical Follow-Up
  36. GRB980703 (I band observations)
  37. GRB980703 (optical R observations)
  38. GRB980703: radio source/optical transient
  39. BeppoSAX NFI observations of GRB 980703
  40. GRB 980703: ASM Position & Intensity
  41. GRB980703
  42. GRB980703 optical followup
  43. Radio observations of SGRs
  44. SGR1900+14 field optical observations
  45. GRB 980613 Near-IR observations
  46. GRB980613, optical observations
  47. GRB 980613: Optical transient and its host galaxy
  48. SGR1627-41, RXTE/ASM observations
  49. SGR1627-41, Refined IPN annulus location
  50. GRB 980613: Detection of the probable host galaxy
  51. GRB 980613: BATSE Observations
  52. SGR1627-41, BeppoSAX-GRBM detections
  53. SGR 1627-41
  54. GRB 980613 Optical Observations
  55. Discovery of a new SGR source, SGR1627-41
  56. GRB980613 Optical Observations
  57. GRB980613 observations from Palomar
  58. GRB980613 BeppoSAX-NFI follow up
  59. GRB980613 Near Infra-Red Observations
  60. GRB980613, BeppoSAX WFC positions
  61. SGR 1900+14
  62. SGR1900+14
  63. SGR1900+14
  64. BATSE on-board GRB trigger change
  65. GRB 980519 Optical Observations
  66. GRB980519 optical observations
  67. GRB980519 I-band observations
  68. GRB 980519
  69. GRB980519 BATSE Observations
  70. GRB970519, optical follow-up at Schmidt Calern
  71. GRB980519 optical observations
  72. GRB980519 Optical Observations
  73. GRB980519 IPN POSITION
  74. GRB 980519 Optical Observations
  75. GRB980519 optical observations
  76. GRB980515, BeppoSAX IAUC to be submitted
  77. BATSE on-board GRB trigger change
  78. GRB980519, BeppoSAX-WFC updated position
  79. GRB980519, BeppoSAX-WFC position
  80. BeppoSAX GRB ALERT: updated position of grb980515
  81. GRB 980425 Brightness Temperature
  82. BSAX Observations of GRB980425 field
  83. IPN web site of GRBs
  84. GRB980425 BATSE observations
  85. SAX J0840.7+2248 Optical Observations
  86. GRB 980425 optical observations
  87. GRB980425: optical obs.
  88. GRB980425: Radio Observations
  89. GRB 980425 optical observations
  90. report on BSAX observations of GRB980425
  91. GRB 980425 optical observations
  92. GRB 980329 ROSAT observation
  93. GRB980326 X-ray Observations
  94. GRB980326, optical observations
  95. GRB980326, optical observations
  96. GRB980329, Fading IR counterpart to radio source
  97. GRB980326 IPN annulus
  98. GRB980329
  99. GRB980329 Keck K-band observations
  100. GRB980329 sub-millimeter observations

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