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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"

36189 results found.

  1. IPN triangulation of GRB030206 (annulus)
  2. IPN triangulation of GRB030208 (annulus)
  3. GRB 030204: Optical Observations
  4. GRB030204 field photometry
  5. GRB020819: Kiso R and I band observations
  6. GRB 030204: Correction to GCN 1856
  7. GRB 030115: Optical Observations
  8. GRB 030204, optical observations
  9. IPN triangulation of GRB030204 (small error box)
  10. IPN triangulation of GRB030202 (annulus)
  11. GRB 030131, optical observations
  12. GRB030131: Kiso optical limit for corrected position
  13. GRB030131: Optical limits for corrected position
  14. GRB 030131: afterglow candidate
  15. GRB 030115, late-time optical observations
  16. GRB030131: corrected INTEGRAL position
  17. Type Ic SN2003L (SN/GRB?), optical spectrum
  18. GRB030131: Kiso Observations
  19. GRB 020819: Host galaxy at Radio Position
  20. IPN triangulation of GRB030131 - CORRECTION
  21. GRB 020819: afterglow candidate
  22. IPN triangulation of GRB030131
  23. GRB 030131 optical observations
  24. GRB 030131 optical observations
  25. A long GRB detected by INTEGRAL
  26. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  27. Type Ic SN2003L (SN/GRB?) Radio Observations
  28. IPN triangulation of GRB030127 (annulus)
  29. GRB030115 submm upper limit
  30. IPN triangulation of GRB030119 (two large error boxes)
  31. GRB 030115: Further IR observations with IRSF/SIRIUS
  32. IPN triangulation of GRB030117 (two large error boxes)
  33. Publicizing GRB Discoveries - A Message from NASA HQ
  34. GRB 030115: Radio detection of IR candidate
  35. GRB 030115, simultaneous observations by BOOTES-1
  36. GRB 030115: IR observations with IRSF/SIRIUS
  37. IPN triangulation of GRB030115C (large error box)
  38. GRB030115: R-band counterpart of IR candidate
  39. GRB030115, afterglow candidate
  40. GRB 021211: R-band observations at late-time
  41. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  42. IPN triangulation of GRB030115B (small error box)
  43. GRB 030115 : Possible IR counterpart
  44. GRB 030115: Radio Observations
  45. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  46. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  47. IPN triangulation of GRB030115B (annulus)
  48. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  49. Distribution of INTEGRAL SPI-ACS triggers
  50. GRB030115: R-band observations at Asiago
  51. GRB030115: TAROT optical observations
  52. GRB 021211: VLT spectrum
  53. GRB 030115: APO Optical Observations
  54. GRB 030115, no optical candidate
  55. GRB 030115, optical observations
  56. GRB 030115, optical candidate
  57. Possible GRB030113 seen by SPI ACS
  58. Probable GRB030112B seen by SPI ACS
  59. Probable GRB030112 seen by SPI ACS
  60. Possible GRB030111 seen by SPI ACS
  61. Possible GRB030110b seen by SPI ACS
  62. Possible GRB 030110 seen by SPI ACS
  63. IPN triangulation of GRB030109 (annulus)
  64. IPN triangulation of GRB030105 (large error box)
  65. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  66. Possible GRB 20030109 seen by SPI ACS
  67. IPN triangulation of GRB030102B (portion of annulus)
  68. IPN triangulation of GRB030102A (large error box)
  69. Possible GRB20030107 seen by SPI-ACS
  70. Possible GRB 20030105 seen by SPI ACS
  71. IPN triangulation of GRB030102 (annulus)
  72. GRB on 20030102 seen by SPI-ACS
  73. VLT spectroscopy of the probable host of GRB 021211
  74. GRB on 20030101 seen by SPI-ACS
  75. IPN triangulation of GRB030101 (two large error boxes)
  76. GRB021226
  77. GRB 021211: Probable Host and Underlying Supernova
  78. GRB 021226 registration by Helicon/Coronas-F
  79. Probable GRB in INTEGRAL SPI-ACS
  80. IPN triangulation of GRB021223 (two large error boxes)
  81. GRB021211, radio observations
  82. GRB 021112: Evidence for Another Dark Optical Afterglow
  83. GRB 021219: OSN optical observations
  84. GRB021219: Radio Observations
  85. IPN triangulation of GRB021219 - CORRECTION
  86. IPN triangulation of GRB021219
  87. GRB021219, optical observation by MASTER
  88. GRB021219: Correction to GCN 1766
  89. VLT spectra of GRB 021211 revisited
  90. GRB021219: a long GRB localized by INTEGRAL
  91. IPN detection of continued activity from SGR1806-20
  92. IPN triangulation of GRB021215 (large error box)
  93. IPN triangulation of GRB021214 (annulus)
  94. XRF 020903 : HST observations
  95. GRB 021201: Optical Observations
  96. GRB 021211, optical observations
  97. GRB 021211: CTIO observations
  98. GRB021211: Measurement of Early Time Afterglow
  99. VLT spectrum of GRB 021211
  100. IPN triangulation of GRB021211B (two large error boxes)

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