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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').

17991 results found.

  1. GRB 981226: radio variable
  2. GRB 981226 Optical Observations
  3. GRB981226 BeppoSAX follow up
  4. GRB 981226
  5. GRB 981226 optical observations
  6. GRB981220 B, R and I band observations
  7. GRB 981220:Optical Observations
  8. GRB 981226 optical observations
  9. GRB 981220, radio observations
  10. GRB 981220: BeppoSAX/GRBM results
  11. GRB981220 Optical Observations
  12. GRB 981220
  13. GRB 980326/Host Galaxy
  14. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  15. BeppoSAX NFI Observation of GRB980425
  16. GRB980329 R,I flux calibration and R,I,K upper limits
  17. GRB980425 Optical Follow-up
  18. GRB980425: X-ray revised positions
  19. GRB980703 Very Long Baseline Interferometry
  20. GRB970508 optical observations
  21. GRB980519, Optical Observations
  22. GRB980703 - BeppoSAX/GRBM detection
  23. GRB980703 optical photometry
  24. GRB 980703: BATSE Observations
  25. GRB980703 optical observations
  26. GRB980703: Radio transient
  27. GRB980703 Transient Optical Follow-Up
  28. GRB980703: LOTIS observation at early times
  29. GRB980613 Optical Observations
  30. GRB 980703
  31. BeppoSAX NFI observations of GRB 980703
  32. GRB980703 optical followup
  33. Radio observations of SGRs
  34. SGR1900+14 field optical observations
  35. GRB 980613: Optical transient and its host galaxy
  36. SGR1627-41, RXTE/ASM observations
  37. GRB 980613: Detection of the probable host galaxy
  38. GRB 980613 Optical Observations
  39. GRB 980613 optical observations
  40. Discovery of a new SGR source, SGR1627-41
  41. GRB980613 Optical Observations
  42. GRB980613 observations from Palomar
  43. GRB980613 Near Infra-Red Observations
  44. GRB980613, BeppoSAX WFC positions
  45. GRB971214 Secondary Standards
  46. GRB980519 Secondary Standards
  47. GRB 980519 Optical Observations
  48. GRB 980519
  49. GRB980519 optical observations
  50. GRB 980519 Optical Observations
  51. GRB980519 BATSE Observations
  52. GRB970519, optical follow-up at Schmidt Calern
  53. GRB980519 Optical Observations
  54. GRB 980519 Optical Observations
  55. GRB980515, BeppoSAX IAUC to be submitted
  56. GRB980519, BeppoSAX-WFC position
  57. BeppoSAX GRB ALERT: updated position of grb980515
  58. GRB 980425 Brightness Temperature
  59. BSAX Observations of GRB980425 field
  60. SAX J0840.7+2248 Optical Observations
  61. GRB980425: optical obs.
  62. GRB980425: Radio Observations
  63. report on BSAX observations of GRB980425
  64. GRB980326 X-ray Observations
  65. GRB980326, optical observations
  66. GRB980326, optical observations
  67. GRB980329 Keck K-band observations
  68. GRB980329 sub-millimeter observations
  69. GRB980326 optical observations
  70. GRB980329 optical observations
  71. GRB980329 VLA observations
  72. GRB980329 optical observations
  73. GRB980326 optical observations
  74. Optical Observations of GRB 970508
  75. GRB 971214: Redshift from Keck Observations
  76. Near-IR follow-up on GRB 971227
  77. Optical Observations of the GRB 971227 field
  78. Optical Observations on GRB 971227
  79. GRB971227: Plaskett R-band observations
  80. GRB 971227: Optical clarifications
  81. GRB971227: Further CAHA R-band images
  82. GRB971227: LOTIS observations
  83. GRB971214: Optical Observations and Calibrations
  84. Sub-millimeter Observations of GRB 971214 at the JCMT
  85. GRB 971214: KPNO Optical Observations
  86. Optical Observations of GRB 971214 at Keck
  87. GRB 971214: Optical Observations
  88. Radio Observations of GRB 971214 at the VLA
  89. GRB 971024: KPNO Optical Observations
  90. RXTE Observations of SGR 1814-13
  91. GRB 970828: Palomar Observations

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