Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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').
  1. GRB 980923 BATSE Observations
  2. SGR1900+14, BeppoSAX-GRBM observations
  3. GRB980703 Very Long Baseline Interferometry
  4. GRB970508 optical observations
  5. GRB971214, association with a Galactic star?
  6. Optical Observations of the Host Galaxy of GRB 980519
  7. GRB980519, Optical Observations
  8. GRB980703, Host galaxy multicolor photometry
  9. GRB980703 - BeppoSAX/GRBM detection
  10. GRB 980703 (NFI observations)
  11. GRB980703 optical photometry
  12. GRB 980703: BATSE Observations
  13. GRB980703 optical observations
  14. GRB980703: Radio transient
  15. GRB980703 H-band Observations
  16. GRB 980703: Spectrum of the proposed optical counterpart
  17. RXTE Observation of GRB 980706
  18. GRB980703: Spectrum of the proposed optical counterpart
  19. GRB980703 Transient Optical Follow-Up
  20. GRB980703: LOTIS observation at early times
  21. GRB980613 Optical Observations
  22. GRB 980703
  23. GRB980703 (I band observations)
  24. GRB 980703 H-band Observations
  25. GRB980703 (optical R observations)
  26. GRB980706
  27. GRB980703: radio source/optical transient
  28. BeppoSAX NFI observations of GRB 980703
  29. GRB 980703: ASM Position & Intensity
  30. GRB980703
  31. GRB980519 observation report
  32. GRB980703 optical followup
  33. SGR1627-41
  34. Radio observations of SGRs
  35. SGR1900+14 field optical observations
  36. GRB 980613 Near-IR observations
  37. GRB980613, optical observations
  38. GRB 980613: Optical transient and its host galaxy
  39. SGR1627-41, RXTE/ASM observations
  40. SGR1627-41, Refined IPN annulus location
  41. GRB 980613: Detection of the probable host galaxy
  42. Reduced error box of SGR 1627-41
  43. GRB 980613: BATSE Observations
  44. SGR1627-41, BeppoSAX-GRBM detections
  45. SGR 1627-41
  46. GRB 980613 Optical Observations
  47. GRB 980613 optical observations
  48. Discovery of a new SGR source, SGR1627-41
  49. GRB980613 Optical Observations
  50. GRB980613 observations from Palomar
  51. GRB980613 BeppoSAX-NFI follow up
  52. GRB 980613 new optical/IR observations
  53. GRB 980613 optical/IR obs.
  54. GRB980613 Near Infra-Red Observations
  55. GRB980611
  56. GRB980613, BeppoSAX WFC positions
  57. GRB971214 Secondary Standards
  58. SGR 1900+14
  59. GRB980519 Secondary Standards
  60. SGR1900+14
  61. SGR1900+14
  62. BATSE on-board GRB trigger change
  63. GRB 980519 Optical Observations
  64. GRB980519 optical observations
  65. GRB980519 I-band observations
  66. GRB 980519
  67. GRB980519 optical observations
  68. GRB 980519 Optical Observations
  69. GRB980519 BATSE Observations
  70. GRB970519, optical follow-up at Schmidt Calern
  71. GRB980519 optical observations
  72. GRB980519 Optical Observations
  73. GRB980519 Optical Observations
  74. GRB980519 IPN POSITION
  75. GRB980519 Optical Observations
  76. GRB 980519 Optical Observations
  77. GRB980519 optical observations
  78. GRB980515, BeppoSAX IAUC to be submitted
  79. BATSE on-board GRB trigger change
  80. GRB980519, BeppoSAX-WFC updated position
  81. GRB980519, BeppoSAX-WFC position
  82. GRB980515: SAX-WFC updated position
  83. BeppoSAX GRB ALERT: updated position of grb980515
  84. GRB 980425 Radio Light Curve
  85. GRB 980425 Brightness Temperature
  86. BSAX Observations of GRB980425 field
  87. IPN web site of GRBs
  88. GRB980425 BATSE observations
  89. SAX J0840.7+2248 Optical Observations
  90. GRB 980425 optical observations
  91. GRB980425: optical obs.
  92. GRB980425: Radio Observations
  93. GRB 980425 optical observations
  94. report on BSAX observations of GRB980425
  95. GRB 980425 optical observations
  96. GRB 980329 ROSAT observation
  97. GRB980326 X-ray Observations
  98. GRB980326, optical observations
  99. GRB980326, optical observations
  100. GRB980329, Fading IR counterpart to radio source

Advanced

Download all Circulars as a .tar.gz archive:
Looking for U.S. government information and services? Visit USA.gov