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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36196 results found.

  1. Support extension to the BeppoSAX mission
  2. GRB 010222 - HEGRA GeV/TeV Observations
  3. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  4. GRB010222: Chandra X-ray Observatory Observation
  5. GRB010222: Sub-millimeter vanishing act
  6. GRB 010222, Optical Observations
  7. GRB 010222: High-Resolution Keck Spectroscopy
  8. GRB 010214, I-band data
  9. Sub-millimeter Excess/GRB 010222
  10. GRB 010222
  11. GRB 010222 HST/Chandra TOO
  12. GRB 010222
  13. GRB010222 further R-band photometry
  14. GRB010222: R-band data
  15. GRB010222 Optical observations
  16. GRB 010222: Keck Spectroscopy
  17. GRB010214, field photometry
  18. GRB010222, field photometry
  19. GRB010222 further R-band photometry
  20. GRB010222, possible increase of optical decay slope
  21. GRB 010222 Kyoto optical observation
  22. GRB010222: fading behavior
  23. GRB 010222 BV optical observations
  24. GRB 010220: Near-IR Observations
  25. GRB010214 follow-up from Hanle
  26. GRB 010222: Near-IR Observations
  27. GRB 010222: Optical Observations
  28. GRB 010222, Decay Slope Confirmed
  29. GRB010222: Another absorption line system
  30. GRB010222: Optical decay slope
  31. GRB 010214, Optical Observations
  32. GRB010222: Sub-millimeter detection
  33. GRB010222: R-band fading behavior
  34. GRB010222: Optical Observations
  35. GRB010222, optical observations
  36. GRB010222: BeppoSAX/NFI Observations
  37. Redshift of the Optical Transient of GRB010222
  38. GRB010214B,Gamma Ray Observations
  39. GRB010222
  40. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  41. GRB 010220, simultaneous optical observations
  42. GRB010220: BeppoSAX WFC and GRBM preliminary data
  43. BeppoSAX ALERT: GRB010220
  44. GRB010214: BeppoSAX WFC and GRBM preliminary data
  45. GRB 010214: X-Ray afterglow
  46. GRB 010214, Optical Observations
  47. GRB 010214 optical observation
  48. GRB010213 Optical Observation
  49. J-Band Observation of GRB 010214.
  50. GRB010213, Near-IR observations
  51. Possible InfraRed Transient of GRB 010214.
  52. GRB010214 Optical Observation
  53. GRB010214: BeppoSAX/NFI Observations
  54. GRB010213 (HETE) TAROT observations
  55. GRB 010214, optical observations
  56. BeppoSAX ALERT: GRB010214
  57. IPN Status Report
  58. HETE Status
  59. GRB010126 opt. obs.
  60. IPN/RXTE TRIANGULATION OF GRB010126
  61. GRB010126: CONCAM crude optical limits during GRB
  62. GRB010126, TNG R-band observations
  63. IPN TRIANGULATION OF GRB010126
  64. IPN/RXTE TRIANGULATION OF GRB010126
  65. GRB 010119, optical observations
  66. GRB010119: Optical observations
  67. Optical Observations of GRB 001018 at Keck
  68. IPN TRIANGULATION OF GRB010119 (SHORT/HARD)
  69. Optical observations of GRB 001018 with JCAM
  70. IPN TRIANGULATION OF GRB010115
  71. IPN TRIANGULATION OF GRB010109
  72. GRB010103, optical observations
  73. IPN triangulation of GRB010104
  74. IPN triangulation of GRB010103
  75. GRB 001204: Ks observations
  76. H band observation of GRB 001212
  77. GRB & BeppoSAX: ground operations restored back to 24 hrs a day
  78. IPN triangulation of GRB001219
  79. GRB 001212 Optical Observation
  80. GRB 001212 Optical Observation
  81. GRB 001212 optical observation
  82. GRB 001212 possible OA in 2MASS
  83. GRB 001212 possible OA
  84. IPN triangulation of GRB001212
  85. Confirmation of IPN position for GRB001204
  86. IPN triangulation of GRB001204 (short/hard)
  87. GRB 001105, further optical observations
  88. GRB001120: Gunn-i observations
  89. GRB001120: Optical observations
  90. GRB001109, optical observations
  91. GRB001120, optical observations
  92. IPN triangulation of GRB001120
  93. Optical/NIR observations of GRB001109
  94. GRB 001109: deep JHK upper limits
  95. GRB 001109 X-ray afterglow with BeppoSAX
  96. GRB001109: Optical observations
  97. GRB001109: BeppoSAX/NFI Observations
  98. GRB001109, R-band optical observations
  99. GRB001109, Radio observations
  100. BeppoSAX ALERT: GRB001109

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