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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"

41188 results found.

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

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