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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"

16099 results found.

  1. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  2. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  3. GRB030115: TAROT optical observations
  4. GRB 030115: APO Optical Observations
  5. GRB 030115, no optical candidate
  6. GRB 030115, optical observations
  7. GRB 030115, optical candidate
  8. GRB 021211: Probable Host and Underlying Supernova
  9. GRB021211, radio observations
  10. GRB 021112: Evidence for Another Dark Optical Afterglow
  11. GRB 021219: OSN optical observations
  12. GRB021219, optical observations
  13. GRB021219, optical observation by MASTER
  14. GRB021211: APO optical observations
  15. XRF 020903 : HST observations
  16. GRB 021201: Optical Observations
  17. GRB 021211, optical observations
  18. GRB 021211: CTIO observations
  19. GRB021211: Measurement of Early Time Afterglow
  20. GRB021211, BVRI field photometry
  21. GRB021211: Optical observations in CrAO
  22. GRB 021211, optical observations
  23. GRB 021211: Optical Observations
  24. GRB021211: Kiso Observations
  25. GRB021204: Kiso Observations
  26. GRB 021201, optical observations
  27. GRB 021211: Radio Observations
  28. GRB021211: Optical observations
  29. GRB 021201 (short/hard), NOT observations
  30. GRB021211 - Upper limits from recent and historical observations
  31. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  32. HETE 2493: Optical observations
  33. HETE 2493: Optical observations
  34. HETE 2493: Optical candidate
  35. GRB 021204: Optical Observations at RIKEN
  36. GRB 021201: Optical Observations
  37. GRB 021201: BOOTES simultaneous optical observations
  38. GRB021004, late time optical observations
  39. GRB 021112: Afterglow or Variable Star?
  40. GRB021113: optical observations at Bisei
  41. GRB 021113: Evidence for a Dark Optical Afterglow
  42. GRB 021112: Variable Source in R-band search
  43. GRB021112: Optical Observations
  44. GRB 021113: Optical observations
  45. GRB 021112: RAPTOR Observations
  46. GRB 021113: Optical Observations
  47. GRB 021113: Optical Observations
  48. GRB021113 (=H2449): A Long GRB Localized by HETE
  49. GRB 021112: Optical Observations
  50. GRB021112 (=H2448): A Long GRB Localized by HETE
  51. GRB 021016: Optical Observations
  52. GRB021104: Optical Observations
  53. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  54. GRB021104: Optical observations
  55. GRB021104: optical observations
  56. GRB021104: Candidate present in DSS
  57. GRB021104: possible optical afterglow
  58. GRB021004, late-time optical observations
  59. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  60. GRB 021004: optical observations
  61. GRB021004: Optical Observations
  62. GRB 020813; likely host galaxy.
  63. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  64. GRB 021016, optical observations
  65. GRB 021004: VRI observations at TNG: possible break
  66. GRB021016, optical observations
  67. GRB 021008, optical observations
  68. GRB021016(=H2397): A Long GRB Localized by HETE
  69. GRB021004: Optical Observations
  70. GRB 021004: optical spectroscopy on Oct 11
  71. GRB021004: High-resolution optical spectroscopy
  72. XRF 020903: flattening of the optical light curve.
  73. GRB021004: Optical Observations
  74. GRB021004 Chandra HETG Observations
  75. GRB 021004: Optical/NIR Observations
  76. GRB 021004: Additional V-band Polarimetric Observations
  77. GRB021004: optical observation
  78. GRB 021004: WC wind?
  79. GRB021004: NIR and Optical observations
  80. GRB 021004: Optical measurement at OHP
  81. GRB 021004: Optical observations, AUDE network
  82. GRB 021004: optical spectroscopy
  83. XRF 020903 spectrum
  84. GRB021004: optical observations and predicted break time
  85. GRB021004: BVRc photometry
  86. GRB 021004 redshift
  87. GRB021004: restart of optical decay
  88. GRB 021004: Optical Decay
  89. GRB 021004 continued IR fading
  90. HETE fluences for GRB021004
  91. GRB 021004, spectroscopic observations
  92. GRB 021004: Optical Photometry at 2.5 Days
  93. GRB 021004: V-band Polarimetric Observations
  94. GRB 021004: Optical Decay
  95. GRB021004, astrometric position
  96. GRB021004, Optical Observations
  97. GRB 021004: Optical observations at RIKEN
  98. GRB 021004: Optical Observations
  99. GRB 021004: Optical Photometry at 1.5 Days
  100. GRB021004, Optical Observations

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