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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"

45438 results found.

  1. GRB 000424, Optical Observations
  2. GRB 000418, Optical Observation
  3. GRB000418, near-infrared observations
  4. BeppoSAX GRB000424
  5. Correction to IPN error box for GRB000419
  6. IPN error box for GRB000418
  7. GRB000419 [IPN Position]
  8. GRB000416 Optical Observations
  9. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  10. GRB000416 BRJK observations
  11. 1SAXJ1715.0-7134 refined position
  12. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  13. X-ray burst or X-ray rich GRB 000416 observed by BeppoSAX
  14. Budget cuts in BeppoSAX operations: impact on GRB observations
  15. GRB 000408, optical observations
  16. Refined IPN error box for GRB000408
  17. GRB 991208, UBVRI field photometry
  18. GRB000301c results
  19. GRB000408: Optical CCD Observations from MIRO
  20. GRB000408, lotis optical observations
  21. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  22. GRB000408 [IPN Position]
  23. GRB000326 Optical Observations
  24. GRB000301C - Addendum to GCN 623
  25. GRB000301C - R magnitude lower limit
  26. GRB000326, Further VLA observations
  27. GRB 000323, optical observations
  28. GRB 000326: Optical Observations
  29. GRB000326, Radio observations
  30. GRB000326 [IPN Position]
  31. GRB 000307 optical observations
  32. GRB000323 [IPN Position]
  33. Single error box for GRB000315
  34. GRB000315 [IPN Positions]
  35. GRB000313, Radio observations
  36. GRB 000313 - optical transient in the BATSE error box
  37. GRB000301C - B and R photometry
  38. GRB000301C - R photometry
  39. GRB 000307, Optical Observations
  40. GRB 000307, BVRI Field Photometry
  41. GRB 000301C: Optical Spectrum and Redshift
  42. GRB 000301C: Optical Spectrum and Redshift
  43. GRB 000301C: A Precise Redshift Determination
  44. GRB 000301C, Optical Observation
  45. GRB 000301C: HST/STIS-PRISM NUV-MAMA spectroscopy
  46. GRB 000301C: HST/STIS CCD Imaging of the field
  47. IPN error box for GRB000307
  48. GRB 000301c: K' observations
  49. GRB000301C, optical R-band observations
  50. GRB000301c - R photometry and nearby faint source confirmation
  51. GRB 000301C, Optical Observation
  52. GRB 000301c: K' observations
  53. GRB 000301C Optical Observations
  54. GRB 000301C: K' Observations
  55. GRB000301C OT candidate optical observations
  56. GRB000301C - Host galaxy not detected in R (?)
  57. Optical observations of GRB000301c
  58. GRB000301C, Radio observations
  59. GRB000301C, Radio observations
  60. GRB000301C optical observations
  61. GRB000301C, near-infrared observations (JHK' imaging)
  62. GRB 000301c near-IR observations
  63. GRB 000301C, Optical Color
  64. GRB000301C, Optical Spectroscopy
  65. GRB 000301C, UBVRI field photometry
  66. GRB 000301C, Optical Observation
  67. GRB000301C, optical observations
  68. GRB000301C 250 GHz detection
  69. GRB 000301C R-band observation
  70. GRB 000301C, Optical Observation
  71. GRB000301C, near-infrared observations (JHK' photometry)
  72. GRB 000301C: OT confirmed
  73. GRB000301c optical observations
  74. GRB 000301A, Radio Observations
  75. GRB000301C, optical observations
  76. GRB000301c, near-infrared observations
  77. GRB000301C
  78. GRB 000301C : Optical Candidate
  79. Radio observations of the error box of GRB000301A
  80. GRB000301C: RXTE/ASM and IPN localizations
  81. GRB000226 [IPN Position]
  82. HST Observations of GRB 990712
  83. GRB 000214 near-IR observations
  84. GRB 000115 Optical observations
  85. GRB 000214, Radio Observations
  86. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  87. GRB000210, Radio Observations
  88. Correction to GCN 557 (GRB000214: BeppoSAX GRBM and WFC Detection)
  89. GRB 000115, BVRI field photometry
  90. GRB000214: BeppoSAX GRBM and WFC Detection
  91. IPN annulus for GRB000214
  92. Optical observations of GRB000210
  93. GRB000210 X-ray afterglow
  94. GRB000214: X-ray afterglow candidate
  95. GRB000214 refined BeppoSAX-WFC position
  96. BeppoSAX GRB000214 ("S. Valentine's day GRB")
  97. GRB 000210: BATSE Observations
  98. Correction to Chandra Position of GRB000210 afterglow
  99. Optical observations of the Chandra X-ray source for GRB000210
  100. GRB000210, Radio Observations

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