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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"

16006 results found.

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

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