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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"

16007 results found.

  1. GRB 020819: afterglow candidate
  2. GRB030131: Optical limit
  3. GRB 030131 optical observations
  4. GRB 030131 optical observations
  5. Type Ic SN2003L (SN/GRB?) Radio Observations
  6. GRB 030115, simultaneous observations by BOOTES-1
  7. GRB030115: R-band counterpart of IR candidate
  8. GRB 021211: R-band observations at late-time
  9. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  10. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  11. GRB030115: TAROT optical observations
  12. GRB 030115: APO Optical Observations
  13. GRB 030115, no optical candidate
  14. GRB 030115, optical observations
  15. GRB 030115, optical candidate
  16. GRB 021211: Probable Host and Underlying Supernova
  17. GRB021211, radio observations
  18. GRB 021112: Evidence for Another Dark Optical Afterglow
  19. GRB 021219: OSN optical observations
  20. GRB021219, optical observations
  21. GRB021219, optical observation by MASTER
  22. GRB021211: APO optical observations
  23. XRF 020903 : HST observations
  24. GRB 021201: Optical Observations
  25. GRB 021211, optical observations
  26. GRB 021211: CTIO observations
  27. GRB021211: Measurement of Early Time Afterglow
  28. GRB021211, BVRI field photometry
  29. GRB021211: Optical observations in CrAO
  30. GRB 021211, optical observations
  31. GRB 021211: Optical Observations
  32. GRB021211: Kiso Observations
  33. GRB021204: Kiso Observations
  34. GRB 021201, optical observations
  35. GRB 021211: Radio Observations
  36. GRB021211: Optical observations
  37. GRB 021201 (short/hard), NOT observations
  38. GRB021211 - Upper limits from recent and historical observations
  39. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  40. HETE 2493: Optical observations
  41. HETE 2493: Optical observations
  42. HETE 2493: Optical candidate
  43. GRB 021204: Optical Observations at RIKEN
  44. GRB 021201: Optical Observations
  45. GRB 021201: BOOTES simultaneous optical observations
  46. GRB021004, late time optical observations
  47. GRB 021112: Afterglow or Variable Star?
  48. GRB021113: optical observations at Bisei
  49. GRB 021113: Evidence for a Dark Optical Afterglow
  50. GRB 021112: Variable Source in R-band search
  51. GRB021112: Optical Observations
  52. GRB 021113: Optical observations
  53. GRB 021112: RAPTOR Observations
  54. GRB 021113: Optical Observations
  55. GRB 021113: Optical Observations
  56. GRB021113 (=H2449): A Long GRB Localized by HETE
  57. GRB 021112: Optical Observations
  58. GRB021112 (=H2448): A Long GRB Localized by HETE
  59. GRB 021016: Optical Observations
  60. GRB021104: Optical Observations
  61. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  62. GRB021104: Optical observations
  63. GRB021104: optical observations
  64. GRB021104: Candidate present in DSS
  65. GRB021104: possible optical afterglow
  66. GRB021004, late-time optical observations
  67. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  68. GRB 021004: optical observations
  69. GRB021004: Optical Observations
  70. GRB 020813; likely host galaxy.
  71. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  72. GRB 021016, optical observations
  73. GRB 021004: VRI observations at TNG: possible break
  74. GRB021016, optical observations
  75. GRB 021008, optical observations
  76. GRB021016(=H2397): A Long GRB Localized by HETE
  77. GRB021004: Optical Observations
  78. GRB 021004: optical spectroscopy on Oct 11
  79. GRB021004: High-resolution optical spectroscopy
  80. XRF 020903: flattening of the optical light curve.
  81. GRB021004: Optical Observations
  82. GRB021004 Chandra HETG Observations
  83. GRB 021004: Optical/NIR Observations
  84. GRB 021004: Additional V-band Polarimetric Observations
  85. GRB021004: optical observation
  86. GRB 021004: WC wind?
  87. GRB021004: NIR and Optical observations
  88. GRB 021004: Optical measurement at OHP
  89. GRB 021004: Optical observations, AUDE network
  90. GRB 021004: optical spectroscopy
  91. XRF 020903 spectrum
  92. GRB021004: optical observations and predicted break time
  93. GRB021004: BVRc photometry
  94. GRB 021004 redshift
  95. GRB021004: restart of optical decay
  96. GRB 021004: Optical Decay
  97. GRB 021004 continued IR fading
  98. HETE fluences for GRB021004
  99. GRB 021004, spectroscopic observations
  100. GRB 021004: Optical Photometry at 2.5 Days

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