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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"

28089 results found.

  1. GRB 000620, optical observations
  2. GRB000418, HST/STIS Observations
  3. GRB990123: Late-time HST/STIS observations of the host
  4. GRB000620, optical observations
  5. GRB000615: H-band observations
  6. GRB990308, HST/STIS observations of the host galaxy
  7. GRB000620 - Optical observations
  8. GRB000620 Optical observations
  9. GRB000620: BeppoSAX WFC and GRBM detection
  10. GRB000607, optical observations
  11. GRB 000615: NIR further observations
  12. GRB990123, HST/STIS observations of the host galaxy
  13. GRB000616 optical observations
  14. GRB 000615, near-infrared observations
  15. GRB 990123: Late-time HST/STIS 50CCD observations of the host
  16. GRB000615, further R-band photometry
  17. GRB 000615: NIR observations
  18. GRB000615: BeppoSAX NFI follow-up preliminary analysis
  19. GRB000615, R-band photometry
  20. The Hosts of GRB 980703 and GRB 971214
  21. GRB 000301C: Further Late-Time HST/STIS observations
  22. GRB000528: follow-up X-ray measurements and update of IPN annulus
  23. GRB980519, HST/STIS observations of the host galaxy
  24. GRB000604 optical non-detection
  25. GRB000604 - Optical observations
  26. GRB000604, optical observations
  27. GRB000528, optical observations at ESO
  28. GRB 000604 optical observations
  29. GRB 000418: Detection of the Host Galaxy
  30. GRB000604, optical observations, comparison with DPOSS
  31. GRB000528, Radio Observations
  32. X-ray Afterglow of GRB 000529
  33. GRB000529: BeppoSAX NFI follow-up preliminary analysis
  34. GRB000528: BeppoSAX NFI follow-up preliminary analysis
  35. GRB 000528 - WFC measurements
  36. GRB000519, BVRI field photometry
  37. IPN triangulation of GRB000519
  38. GRB000508B, optical photometry
  39. GRB000508B, BVR field photometry
  40. Possible GRB-related phenomenon
  41. RXTE/ASM and IPN localization of GRB 000508B
  42. GRB000424, UBVRI field photometry
  43. GRB000418, UBVRI field photometry update
  44. GRB000424, optical observations
  45. GRB 000429, optical observation
  46. GRB 000429, UBVRI field photometry
  47. GRB 000418, UBVRI field photometry
  48. GRB 000418, optical observation
  49. GRB 000418, Optical Observation
  50. GRB000418, near-infrared observations
  51. Correction to IPN error box for GRB000419
  52. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  53. GRB000416 BRJK observations
  54. RE: Budget cuts in BeppoSAX operations: impact on GRB observation
  55. GRB 000408, optical observations
  56. GRB 991208, UBVRI field photometry
  57. GRB000408, lotis optical observations
  58. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  59. GRB000301C - Addendum to GCN 623
  60. GRB 000323, optical observations
  61. GRB 000326: Optical Observations
  62. GRB000326, Radio observations
  63. GRB000313, Radio observations
  64. GRB 000313 - optical transient in the BATSE error box
  65. GRB 000307, Optical Observations
  66. GRB 000307, BVRI Field Photometry
  67. GRB 000301C: A Precise Redshift Determination
  68. GRB 000301C, Optical Observation
  69. GRB 000301C: HST/STIS CCD Imaging of the field
  70. IPN error box for GRB000307
  71. GRB000301C, optical R-band observations
  72. GRB 000301C Optical Observations
  73. GRB 000301C: K' Observations
  74. GRB000301C OT candidate optical observations
  75. GRB000301C - Host galaxy not detected in R (?)
  76. Optical observations of GRB000301c
  77. GRB000301C, Radio observations
  78. GRB000301C, Radio observations
  79. GRB000301C, near-infrared observations (JHK' imaging)
  80. GRB 000301c near-IR observations
  81. GRB 000301C, UBVRI field photometry
  82. GRB 000301C: OT confirmed
  83. GRB000301c optical observations
  84. GRB000301C, optical observations
  85. GRB000301C
  86. GRB 000301C : Optical Candidate
  87. GRB000301C: RXTE/ASM and IPN localizations
  88. GRB000226 [IPN Position]
  89. HST Observations of GRB 990712
  90. GRB 000214 near-IR observations
  91. GRB 000214 ``Valentine's Day Burst'': BeppoSAX NFI Observation
  92. GRB000210, Radio Observations
  93. GRB 000115, BVRI field photometry
  94. GRB000214: BeppoSAX GRBM and WFC Detection
  95. Optical observations of GRB000210
  96. GRB000210 X-ray afterglow
  97. GRB000214: X-ray afterglow candidate
  98. GRB000214 refined BeppoSAX-WFC position
  99. GRB 000210: BATSE Observations
  100. Optical observations of the Chandra X-ray source for GRB000210

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