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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"

39250 results found.

  1. GRB030227:Optical observations
  2. GRB 20030226: Upper limits from recent and historical observations
  3. GRB 030227, possible optical counterpart of XMM-Newton source
  4. GRB030227 - faint tentative OT candidate
  5. GRB 030226, optical observations
  6. GRB030227: Kiso optical observations
  7. GRB 030227: Kyoto optical observation
  8. GRB 030226, optical light curve
  9. GRB 030226 spectroscopy
  10. Possible break in the GRB 030226 light curve
  11. GRB 030226 : Predicted light curve
  12. IPN triangulation of GRB030225 (annulus)
  13. GRB 030226: Confirmed decay index
  14. GRB030226: ESI spectroscopy
  15. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  16. GRB 030226 simultaneous optical observations
  17. Two absorption systems in GRB 030226
  18. GRB 030226, optical observations
  19. GRB 030226 Optical Spectra and R,I,z' Imaging
  20. GRB 030226, optical observations
  21. GRB 030226: Optical afterglow
  22. GRB 030217: Optical Observations at 4, 5, and 6 Days
  23. IPN triangulation of GRB030223 (annulus)
  24. IPN triangulation of GRB030220 (annulus)
  25. GRB: Non-Referencing of GCN Circulars.
  26. IPN triangulation of GRB030218 (annulus)
  27. IPN triangulation of GRB030217 (small error box)
  28. IPN triangulation of GRB030215C (annulus)
  29. IPN triangulation of GRB030217 (annulus)
  30. IPN triangulation of GRB030216 (annulus)
  31. IPN triangulation of GRB030215A and GRB030215B (annuli)
  32. GRB030115, WSRT radio observations - correction to GCN 1864
  33. GRB 030131: marginal optical detection
  34. GRB030115, WSRT radio observations
  35. IPN triangulation of GRB030206 (annulus)
  36. IPN triangulation of GRB030208 (annulus)
  37. GRB 030204: Optical Observations
  38. GRB030204 field photometry
  39. GRB020819: Kiso R and I band observations
  40. GRB 030204: Correction to GCN 1856
  41. GRB 030115: Optical Observations
  42. GRB 030204, optical observations
  43. IPN triangulation of GRB030204 (small error box)
  44. IPN triangulation of GRB030202 (annulus)
  45. GRB 030131, optical observations
  46. GRB030131: Kiso optical limit for corrected position
  47. GRB030131: Optical limits for corrected position
  48. GRB 030131: afterglow candidate
  49. GRB 030115, late-time optical observations
  50. GRB030131: corrected INTEGRAL position
  51. Type Ic SN2003L (SN/GRB?), optical spectrum
  52. GRB030131: Kiso Observations
  53. GRB 020819: Host galaxy at Radio Position
  54. IPN triangulation of GRB030131 - CORRECTION
  55. GRB 020819: afterglow candidate
  56. IPN triangulation of GRB030131
  57. GRB 030131 optical observations
  58. GRB 030131 optical observations
  59. A long GRB detected by INTEGRAL
  60. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  61. Type Ic SN2003L (SN/GRB?) Radio Observations
  62. IPN triangulation of GRB030127 (annulus)
  63. GRB030115 submm upper limit
  64. IPN triangulation of GRB030119 (two large error boxes)
  65. GRB 030115: Further IR observations with IRSF/SIRIUS
  66. IPN triangulation of GRB030117 (two large error boxes)
  67. Publicizing GRB Discoveries - A Message from NASA HQ
  68. GRB 030115: Radio detection of IR candidate
  69. GRB 030115, simultaneous observations by BOOTES-1
  70. GRB 030115: IR observations with IRSF/SIRIUS
  71. IPN triangulation of GRB030115C (large error box)
  72. GRB030115: R-band counterpart of IR candidate
  73. GRB030115, afterglow candidate
  74. GRB 021211: R-band observations at late-time
  75. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  76. IPN triangulation of GRB030115B (small error box)
  77. GRB 030115 : Possible IR counterpart
  78. GRB 030115: Radio Observations
  79. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  80. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  81. IPN triangulation of GRB030115B (annulus)
  82. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  83. Distribution of INTEGRAL SPI-ACS triggers
  84. GRB030115: R-band observations at Asiago
  85. GRB030115: TAROT optical observations
  86. GRB 021211: VLT spectrum
  87. GRB 030115: APO Optical Observations
  88. GRB 030115, no optical candidate
  89. GRB 030115, optical observations
  90. GRB 030115, optical candidate
  91. Possible GRB030113 seen by SPI ACS
  92. Probable GRB030112B seen by SPI ACS
  93. Probable GRB030112 seen by SPI ACS
  94. Possible GRB030111 seen by SPI ACS
  95. Possible GRB030110b seen by SPI ACS
  96. Possible GRB 030110 seen by SPI ACS
  97. IPN triangulation of GRB030109 (annulus)
  98. IPN triangulation of GRB030105 (large error box)
  99. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  100. Possible GRB 20030109 seen by SPI ACS

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