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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"

42185 results found.

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

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