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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').

18684 results found.

  1. GRB 981226 optical observations
  2. GRB 981220, radio observations
  3. GRB 981220: BeppoSAX/GRBM results
  4. GRB981220 Optical Observations
  5. GRB 981220
  6. GRB 980326/Host Galaxy
  7. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  8. BeppoSAX NFI Observation of GRB980425
  9. GRB980329 R,I flux calibration and R,I,K upper limits
  10. GRB980425 Optical Follow-up
  11. GRB980425: X-ray revised positions
  12. GRB980703 Very Long Baseline Interferometry
  13. GRB970508 optical observations
  14. GRB980519, Optical Observations
  15. GRB980703 - BeppoSAX/GRBM detection
  16. GRB980703 optical photometry
  17. GRB 980703: BATSE Observations
  18. GRB980703 optical observations
  19. GRB980703: Radio transient
  20. GRB980703 Transient Optical Follow-Up
  21. GRB980703: LOTIS observation at early times
  22. GRB980613 Optical Observations
  23. GRB 980703
  24. BeppoSAX NFI observations of GRB 980703
  25. GRB980703 optical followup
  26. Radio observations of SGRs
  27. SGR1900+14 field optical observations
  28. GRB 980613: Optical transient and its host galaxy
  29. SGR1627-41, RXTE/ASM observations
  30. GRB 980613: Detection of the probable host galaxy
  31. GRB 980613 Optical Observations
  32. GRB 980613 optical observations
  33. Discovery of a new SGR source, SGR1627-41
  34. GRB980613 Optical Observations
  35. GRB980613 observations from Palomar
  36. GRB980613 Near Infra-Red Observations
  37. GRB980613, BeppoSAX WFC positions
  38. GRB971214 Secondary Standards
  39. GRB980519 Secondary Standards
  40. GRB 980519 Optical Observations
  41. GRB 980519
  42. GRB980519 optical observations
  43. GRB 980519 Optical Observations
  44. GRB980519 BATSE Observations
  45. GRB970519, optical follow-up at Schmidt Calern
  46. GRB980519 Optical Observations
  47. GRB 980519 Optical Observations
  48. GRB980515, BeppoSAX IAUC to be submitted
  49. GRB980519, BeppoSAX-WFC position
  50. BeppoSAX GRB ALERT: updated position of grb980515
  51. GRB 980425 Brightness Temperature
  52. BSAX Observations of GRB980425 field
  53. SAX J0840.7+2248 Optical Observations
  54. GRB980425: optical obs.
  55. GRB980425: Radio Observations
  56. report on BSAX observations of GRB980425
  57. GRB980326 X-ray Observations
  58. GRB980326, optical observations
  59. GRB980326, optical observations
  60. GRB980329 Keck K-band observations
  61. GRB980329 sub-millimeter observations
  62. GRB980326 optical observations
  63. GRB980329 optical observations
  64. GRB980329 VLA observations
  65. GRB980329 optical observations
  66. GRB980326 optical observations
  67. Optical Observations of GRB 970508
  68. GRB 971214: Redshift from Keck Observations
  69. Near-IR follow-up on GRB 971227
  70. Optical Observations of the GRB 971227 field
  71. Optical Observations on GRB 971227
  72. GRB971227: Plaskett R-band observations
  73. GRB 971227: Optical clarifications
  74. GRB971227: Further CAHA R-band images
  75. GRB971227: LOTIS observations
  76. GRB971214: Optical Observations and Calibrations
  77. Sub-millimeter Observations of GRB 971214 at the JCMT
  78. GRB 971214: KPNO Optical Observations
  79. Optical Observations of GRB 971214 at Keck
  80. GRB 971214: Optical Observations
  81. Radio Observations of GRB 971214 at the VLA
  82. GRB 971024: KPNO Optical Observations
  83. RXTE Observations of SGR 1814-13
  84. GRB 970828: Palomar Observations

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