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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"

45678 results found.

  1. GRB030227 - faint tentative OT candidate
  2. GRB 030226, optical observations
  3. XMM-Newton observation of GRB030227
  4. GRB030227: Kiso optical observations
  5. GRB 030227: Kyoto optical observation
  6. GRB 030226, optical light curve
  7. GRB 030226 spectroscopy
  8. GRB030227: refined INTEGRAL position
  9. GRB030227 localized by INTEGRAL
  10. Possible break in the GRB 030226 light curve
  11. GRB 030226 : Predicted light curve
  12. GRB030226: optical observation
  13. IPN triangulation of GRB030225 (annulus)
  14. GRB 030226: Confirmed decay index
  15. GRB030226: ESI spectroscopy
  16. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  17. GRB 030226 simultaneous optical observations
  18. Two absorption systems in GRB 030226
  19. GRB 030226, optical observations
  20. GRB030226: optical observations and refined redshift
  21. GRB030226: Optical decay index
  22. GRB 030226 Optical Spectra and R,I,z' Imaging
  23. GRB 030226, optical observations
  24. GRB 030226: Optical afterglow
  25. GRB030226: Candidate optical afterglow
  26. GRB 030217: Optical Observations at 4, 5, and 6 Days
  27. IPN triangulation of GRB030223 (annulus)
  28. IPN triangulation of GRB030220 (annulus)
  29. GRB: Non-Referencing of GCN Circulars.
  30. IPN triangulation of GRB030218 (annulus)
  31. GRB030217: optical observations
  32. IPN triangulation of GRB030217 (small error box)
  33. IPN triangulation of GRB030215C (annulus)
  34. IPN triangulation of GRB030217 (annulus)
  35. IPN triangulation of GRB030216 (annulus)
  36. IPN triangulation of GRB030215A and GRB030215B (annuli)
  37. GRB030115, WSRT radio observations - correction to GCN 1864
  38. GRB 030131: marginal optical detection
  39. GCN/INTEGRAL Mistake Fixed
  40. GRB030115, WSRT radio observations
  41. IPN triangulation of GRB030206 (annulus)
  42. IPN triangulation of GRB030208 (annulus)
  43. GRB 030204: Optical Observations
  44. GRB030204 field photometry
  45. GRB020819: Kiso R and I band observations
  46. GRB030131: Candidate Optical Afterglow
  47. GRB 030115: Optical Observations
  48. GRB 030204, optical observations
  49. IPN triangulation of GRB030204 (small error box)
  50. IPN triangulation of GRB030202 (annulus)
  51. GRB 030131, optical observations
  52. GRB030131: Kiso optical limit for corrected position
  53. GRB030131: Optical limits for corrected position
  54. GRB 030131: afterglow candidate
  55. GRB 030115, late-time optical observations
  56. GRB030131: corrected INTEGRAL position
  57. Type Ic SN2003L (SN/GRB?), optical spectrum
  58. GRB030131: Kiso Observations
  59. GRB 020819: Host galaxy at Radio Position
  60. IPN triangulation of GRB030131 - CORRECTION
  61. GRB 020819: afterglow candidate
  62. IPN triangulation of GRB030131
  63. GRB030131: Optical limit
  64. GRB 030131 optical observations
  65. GRB030131: refined position
  66. GRB 030131 optical observations
  67. A long GRB detected by INTEGRAL
  68. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  69. Type Ic SN2003L (SN/GRB?) Radio Observations
  70. IPN triangulation of GRB030127 (annulus)
  71. GRB030115 submm upper limit
  72. IPN triangulation of GRB030119 (two large error boxes)
  73. GRB 030115: Further IR observations with IRSF/SIRIUS
  74. IPN triangulation of GRB030117 (two large error boxes)
  75. Publicizing GRB Discoveries - A Message from NASA HQ
  76. GRB 030115: Radio detection of IR candidate
  77. GRB 030115, simultaneous observations by BOOTES-1
  78. GRB 030115: IR observations with IRSF/SIRIUS
  79. IPN triangulation of GRB030115C (large error box)
  80. GRB030115: R-band counterpart of IR candidate
  81. GRB030115, afterglow candidate
  82. GRB 021211: R-band observations at late-time
  83. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  84. IPN triangulation of GRB030115B (small error box)
  85. GRB 030115 : Possible IR counterpart
  86. GRB 030115: Radio Observations
  87. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  88. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  89. IPN triangulation of GRB030115B (annulus)
  90. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  91. Distribution of INTEGRAL SPI-ACS triggers
  92. GRB030115: R-band observations at Asiago
  93. GRB030115: TAROT optical observations
  94. GRB 021211: VLT spectrum
  95. GRB 030115: APO Optical Observations
  96. GRB 030115, no optical candidate
  97. GRB 030115, optical observations
  98. GRB 030115, optical candidate
  99. Possible GRB030113 seen by SPI ACS
  100. Probable GRB030112B seen by SPI ACS

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