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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"

36196 results found.

  1. GRB030115, WSRT radio observations - correction to GCN 1864
  2. GRB 030131: marginal optical detection
  3. GRB030115, WSRT radio observations
  4. IPN triangulation of GRB030206 (annulus)
  5. IPN triangulation of GRB030208 (annulus)
  6. GRB 030204: Optical Observations
  7. GRB030204 field photometry
  8. GRB020819: Kiso R and I band observations
  9. GRB 030204: Correction to GCN 1856
  10. GRB 030115: Optical Observations
  11. GRB 030204, optical observations
  12. IPN triangulation of GRB030204 (small error box)
  13. IPN triangulation of GRB030202 (annulus)
  14. GRB 030131, optical observations
  15. GRB030131: Kiso optical limit for corrected position
  16. GRB030131: Optical limits for corrected position
  17. GRB 030131: afterglow candidate
  18. GRB 030115, late-time optical observations
  19. GRB030131: corrected INTEGRAL position
  20. Type Ic SN2003L (SN/GRB?), optical spectrum
  21. GRB030131: Kiso Observations
  22. GRB 020819: Host galaxy at Radio Position
  23. IPN triangulation of GRB030131 - CORRECTION
  24. GRB 020819: afterglow candidate
  25. IPN triangulation of GRB030131
  26. GRB 030131 optical observations
  27. GRB 030131 optical observations
  28. A long GRB detected by INTEGRAL
  29. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  30. Type Ic SN2003L (SN/GRB?) Radio Observations
  31. IPN triangulation of GRB030127 (annulus)
  32. GRB030115 submm upper limit
  33. IPN triangulation of GRB030119 (two large error boxes)
  34. GRB 030115: Further IR observations with IRSF/SIRIUS
  35. IPN triangulation of GRB030117 (two large error boxes)
  36. Publicizing GRB Discoveries - A Message from NASA HQ
  37. GRB 030115: Radio detection of IR candidate
  38. GRB 030115, simultaneous observations by BOOTES-1
  39. GRB 030115: IR observations with IRSF/SIRIUS
  40. IPN triangulation of GRB030115C (large error box)
  41. GRB030115: R-band counterpart of IR candidate
  42. GRB030115, afterglow candidate
  43. GRB 021211: R-band observations at late-time
  44. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  45. IPN triangulation of GRB030115B (small error box)
  46. GRB 030115 : Possible IR counterpart
  47. GRB 030115: Radio Observations
  48. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  49. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  50. IPN triangulation of GRB030115B (annulus)
  51. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  52. Distribution of INTEGRAL SPI-ACS triggers
  53. GRB030115: R-band observations at Asiago
  54. GRB030115: TAROT optical observations
  55. GRB 021211: VLT spectrum
  56. GRB 030115: APO Optical Observations
  57. GRB 030115, no optical candidate
  58. GRB 030115, optical observations
  59. GRB 030115, optical candidate
  60. Possible GRB030113 seen by SPI ACS
  61. Probable GRB030112B seen by SPI ACS
  62. Probable GRB030112 seen by SPI ACS
  63. Possible GRB030111 seen by SPI ACS
  64. Possible GRB030110b seen by SPI ACS
  65. Possible GRB 030110 seen by SPI ACS
  66. IPN triangulation of GRB030109 (annulus)
  67. IPN triangulation of GRB030105 (large error box)
  68. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  69. Possible GRB 20030109 seen by SPI ACS
  70. IPN triangulation of GRB030102B (portion of annulus)
  71. IPN triangulation of GRB030102A (large error box)
  72. Possible GRB20030107 seen by SPI-ACS
  73. Possible GRB 20030105 seen by SPI ACS
  74. IPN triangulation of GRB030102 (annulus)
  75. GRB on 20030102 seen by SPI-ACS
  76. VLT spectroscopy of the probable host of GRB 021211
  77. GRB on 20030101 seen by SPI-ACS
  78. IPN triangulation of GRB030101 (two large error boxes)
  79. GRB021226
  80. GRB 021211: Probable Host and Underlying Supernova
  81. GRB 021226 registration by Helicon/Coronas-F
  82. Probable GRB in INTEGRAL SPI-ACS
  83. IPN triangulation of GRB021223 (two large error boxes)
  84. GRB021211, radio observations
  85. GRB 021112: Evidence for Another Dark Optical Afterglow
  86. GRB 021219: OSN optical observations
  87. GRB021219: Radio Observations
  88. IPN triangulation of GRB021219 - CORRECTION
  89. IPN triangulation of GRB021219
  90. GRB021219, optical observation by MASTER
  91. GRB021219: Correction to GCN 1766
  92. VLT spectra of GRB 021211 revisited
  93. GRB021219: a long GRB localized by INTEGRAL
  94. IPN detection of continued activity from SGR1806-20
  95. IPN triangulation of GRB021215 (large error box)
  96. IPN triangulation of GRB021214 (annulus)
  97. XRF 020903 : HST observations
  98. GRB 021201: Optical Observations
  99. GRB 021211, optical observations
  100. GRB 021211: CTIO observations

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