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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"

19276 results found.

  1. GRB 030227: Confirmed Optical Afterglow (S1-A)
  2. GRB 030227, possible optical counterpart of XMM-Newton source
  3. GRB030227 - faint tentative OT candidate
  4. GRB 030226, optical observations
  5. XMM-Newton observation of GRB030227
  6. GRB 030226, optical light curve
  7. GRB 030226 : Predicted light curve
  8. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  9. GRB 030226 simultaneous optical observations
  10. GRB 030226, optical observations
  11. GRB 030226 Optical Spectra and R,I,z' Imaging
  12. GRB: Non-Referencing of GCN Circulars.
  13. IPN triangulation of GRB030217 (small error box)
  14. GRB 030204: Optical Observations
  15. GRB030131: Candidate Optical Afterglow
  16. GRB 030204, optical observations
  17. IPN triangulation of GRB030204 (small error box)
  18. GRB 030131, optical observations
  19. GRB 030131: afterglow candidate
  20. GRB030131: corrected INTEGRAL position
  21. IPN triangulation of GRB030131
  22. GRB030131: refined position
  23. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  24. GRB 030115, simultaneous observations by BOOTES-1
  25. IPN triangulation of GRB030115C (large error box)
  26. GRB 021211: R-band observations at late-time
  27. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  28. GRB 030115: APO Optical Observations
  29. Information about where HETE will be pointing
  30. IPN triangulation of GRB030105 (large error box)
  31. IPN triangulation of GRB030102B (portion of annulus)
  32. VLT spectroscopy of the probable host of GRB 021211
  33. IPN triangulation of GRB030101 (two large error boxes)
  34. IPN triangulation of GRB021223 (two large error boxes)
  35. GRB 021112: Evidence for Another Dark Optical Afterglow
  36. VLT spectra of GRB 021211 revisited
  37. GRB021219: a long GRB localized by INTEGRAL
  38. GRB021211: APO optical observations
  39. XRF 020903 : HST observations
  40. GRB 021201: Optical Observations
  41. GRB 021211: CTIO observations
  42. VLT spectrum of GRB 021211
  43. GRB 021211, optical observations
  44. SUB-MM SEARCH FOR GRB 021211
  45. Chandra observation of the IPN error box of GRB021201 (short/hard)
  46. GRB021211 - Upper limits from recent and historical observations
  47. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  48. IPN triangulation of GRB021206 (small error box)
  49. IPN triangulation of GRB021205 (large error box)
  50. GRB 021201: BOOTES simultaneous optical observations
  51. IPN triangulation of GRB021201 (short/hard burst, small error box)
  52. GRB021004 Chandra Observation
  53. IPN detection of continued SGR1900+14 activity
  54. Improved IPN error box for GRB021125
  55. IPN BURST POSITION
  56. IPN triangulation of GRB021125 (INTEGRAL BURST)
  57. IPN confirmation of the reactivation of SGR1900+14
  58. GRB021113, SPI ACS observation
  59. GRB 021112: Afterglow or Variable Star?
  60. GRB 021113: Evidence for a Dark Optical Afterglow
  61. GRB021112, BVRI field photometry
  62. IPN triangulation of GRB021113 (=H2449; annulus)
  63. GRB021113 (=H2449): A Long GRB Localized by HETE
  64. GRB021112 (=H2448): A Long GRB Localized by HETE
  65. GRB 021016: Optical Observations
  66. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  67. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  68. SGR1900+14 activity, November 2-4, 2002
  69. Detection of activity from SGR 1900+14 with the RXTE/PCA
  70. IPN triangulation of GRB021027 (single large error box)
  71. IPN triangulation of GRB021027 (two large error boxes)
  72. IPN triangulation of GRB021027 (annulus)
  73. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  74. IPN triangulation of GRB021025 (annulus)
  75. IPN triangulation of SGR1900+14, October 22 2002
  76. GRB 021004: optical observations
  77. IPN triangulation of GRB021023 (small error boc)
  78. GRB 020813; likely host galaxy.
  79. IPN triangulation of GRB021020 (smaller error box)
  80. IPN triangulation of GRB021020
  81. SGR1900+14: burst on October 10 2002
  82. GRB 021008, optical observations
  83. IPN triangulation of GRB021016 (small error box)
  84. IPN triangulation of GRB021014 (large error box)
  85. IPN triangulation of GRB021013 (single error box)
  86. GRB 021004: optical spectroscopy on Oct 11
  87. IPN triangulation of GRB021013 (two small error boxes)
  88. GRB021004: High-resolution optical spectroscopy
  89. IPN triangulation of GRB021013 (annulus)
  90. XRF 020903: flattening of the optical light curve.
  91. IPN triangulation of GRB021008 (single error box)
  92. GRB 021004 submm observations
  93. IPN triangulation of GRB021008B (annulus)
  94. IPN triangulation of GRB021008 (two small error boxes)
  95. GRB021004 Chandra HETG Observations
  96. GRB 021004: Additional V-band Polarimetric Observations
  97. GRB 021004: Host Galaxy Star Formation Rate
  98. GRB 021004 submm observations
  99. GRB 021004: WC wind?
  100. GRB021004: NIR and Optical observations

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