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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"

27867 results found.

  1. GRB980519, HST/STIS observations of the host galaxy
  2. GRB000604 optical non-detection
  3. GRB000604 - Optical observations
  4. GRB000604, optical observations
  5. GRB000528, optical observations at ESO
  6. GRB 000604 optical observations
  7. GRB 000418: Detection of the Host Galaxy
  8. GRB000604, optical observations, comparison with DPOSS
  9. GRB000528, Radio Observations
  10. X-ray Afterglow of GRB 000529
  11. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  12. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  13. GRB 000528 - WFC measurements
  14. GRB000519, BVRI field photometry
  15. IPN triangulation of GRB000519
  16. GRB000508B, optical photometry
  17. GRB000508B, BVR field photometry
  18. Possible GRB-related phenomenon
  19. RXTE/ASM and IPN localization of GRB 000508B
  20. GRB000424, UBVRI field photometry
  21. GRB000418, UBVRI field photometry update
  22. GRB000424, optical observations
  23. GRB 000429, optical observation
  24. GRB 000429, UBVRI field photometry
  25. GRB 000418, UBVRI field photometry
  26. GRB 000418, optical observation
  27. GRB 000418, Optical Observation
  28. GRB000418, near-infrared observations
  29. Correction to IPN error box for GRB000419
  30. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  31. GRB000416 BRJK observations
  32. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  33. GRB 000408, optical observations
  34. GRB 991208, UBVRI field photometry
  35. GRB000408, lotis optical observations
  36. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  37. GRB000301C - Addendum to GCN 623
  38. GRB 000323, optical observations
  39. GRB 000326: Optical Observations
  40. GRB000326, Radio observations
  41. GRB000313, Radio observations
  42. GRB 000313 - optical transient in the BATSE error box
  43. GRB 000307, Optical Observations
  44. GRB 000307, BVRI Field Photometry
  45. GRB 000301C: A Precise Redshift Determination
  46. GRB 000301C, Optical Observation
  47. GRB 000301C: HST/STIS CCD Imaging of the field
  48. IPN error box for GRB000307
  49. GRB000301C, optical R-band observations
  50. GRB 000301C Optical Observations
  51. GRB 000301C: K' Observations
  52. GRB000301C OT candidate optical observations
  53. GRB000301C - Host galaxy not detected in R (?)
  54. Optical observations of GRB000301c
  55. GRB000301C, Radio observations
  56. GRB000301C, Radio observations
  57. GRB000301C, near-infrared observations (JHK' imaging)
  58. GRB 000301c near-IR observations
  59. GRB 000301C, UBVRI field photometry
  60. GRB 000301C: OT confirmed
  61. GRB000301c optical observations
  62. GRB000301C, optical observations
  63. GRB000301C
  64. GRB 000301C : Optical Candidate
  65. GRB000301C: RXTE/ASM and IPN localizations
  66. GRB000226 [IPN Position]
  67. HST Observations of GRB 990712
  68. GRB 000214 near-IR observations
  69. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  70. GRB000210, Radio Observations
  71. GRB 000115, BVRI field photometry
  72. GRB000214: BeppoSAX GRBM and WFC Detection
  73. Optical observations of GRB000210
  74. GRB000210 X-ray afterglow
  75. GRB000214: X-ray afterglow candidate
  76. GRB000214 refined BeppoSAX-WFC position
  77. GRB 000210: BATSE Observations
  78. Optical observations of the Chandra X-ray source for GRB000210
  79. GRB000210, Radio Observations
  80. IPN triangulation of GRB000210
  81. GRB000210: possible afterglow detection with BeppoSAX NFI
  82. GRB000201, Radio Observations
  83. GRB000210: BeppoSAX GRBM and WFC Detection
  84. SAX_WFC_GRB_NOTICE
  85. SAX_WFC_GRB_NOTICE
  86. GRB000201 Optical Observations
  87. GRB 000201: TAROT optical observations
  88. GRB 991208, radio observations
  89. BATSE+IPN location of GRB000131
  90. IPN localization of GRB000131
  91. GRB 000126, optical observations
  92. BATSE Observations of GRB000115
  93. Second RXTE Observation of GRB 000115
  94. GRB991216, UBVRIJHK field photometry
  95. GCN resumes full operations
  96. GRB 991216 VLBA Observations
  97. GRB 991216: J band spectrophotometry
  98. GRB 991216: Detection of the Host and/or Absorber Galaxy
  99. IPN localization of GRB991226
  100. GRB 991216 RXTE ASM Observations

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