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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"

37582 results found.

  1. GRB 030204, optical observations
  2. IPN triangulation of GRB030204 (small error box)
  3. IPN triangulation of GRB030202 (annulus)
  4. GRB 030131, optical observations
  5. GRB030131: Kiso optical limit for corrected position
  6. GRB030131: Optical limits for corrected position
  7. GRB 030131: afterglow candidate
  8. GRB 030115, late-time optical observations
  9. GRB030131: corrected INTEGRAL position
  10. Type Ic SN2003L (SN/GRB?), optical spectrum
  11. GRB030131: Kiso Observations
  12. GRB 020819: Host galaxy at Radio Position
  13. IPN triangulation of GRB030131 - CORRECTION
  14. GRB 020819: afterglow candidate
  15. IPN triangulation of GRB030131
  16. GRB 030131 optical observations
  17. GRB 030131 optical observations
  18. A long GRB detected by INTEGRAL
  19. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  20. Type Ic SN2003L (SN/GRB?) Radio Observations
  21. IPN triangulation of GRB030127 (annulus)
  22. GRB030115 submm upper limit
  23. IPN triangulation of GRB030119 (two large error boxes)
  24. GRB 030115: Further IR observations with IRSF/SIRIUS
  25. IPN triangulation of GRB030117 (two large error boxes)
  26. Publicizing GRB Discoveries - A Message from NASA HQ
  27. GRB 030115: Radio detection of IR candidate
  28. GRB 030115, simultaneous observations by BOOTES-1
  29. GRB 030115: IR observations with IRSF/SIRIUS
  30. IPN triangulation of GRB030115C (large error box)
  31. GRB030115: R-band counterpart of IR candidate
  32. GRB030115, afterglow candidate
  33. GRB 021211: R-band observations at late-time
  34. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  35. IPN triangulation of GRB030115B (small error box)
  36. GRB 030115 : Possible IR counterpart
  37. GRB 030115: Radio Observations
  38. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  39. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  40. IPN triangulation of GRB030115B (annulus)
  41. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  42. Distribution of INTEGRAL SPI-ACS triggers
  43. GRB030115: R-band observations at Asiago
  44. GRB030115: TAROT optical observations
  45. GRB 021211: VLT spectrum
  46. GRB 030115: APO Optical Observations
  47. GRB 030115, no optical candidate
  48. GRB 030115, optical observations
  49. GRB 030115, optical candidate
  50. Possible GRB030113 seen by SPI ACS
  51. Probable GRB030112B seen by SPI ACS
  52. Probable GRB030112 seen by SPI ACS
  53. Possible GRB030111 seen by SPI ACS
  54. Possible GRB030110b seen by SPI ACS
  55. Possible GRB 030110 seen by SPI ACS
  56. IPN triangulation of GRB030109 (annulus)
  57. IPN triangulation of GRB030105 (large error box)
  58. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  59. Possible GRB 20030109 seen by SPI ACS
  60. IPN triangulation of GRB030102B (portion of annulus)
  61. IPN triangulation of GRB030102A (large error box)
  62. Possible GRB20030107 seen by SPI-ACS
  63. Possible GRB 20030105 seen by SPI ACS
  64. IPN triangulation of GRB030102 (annulus)
  65. GRB on 20030102 seen by SPI-ACS
  66. VLT spectroscopy of the probable host of GRB 021211
  67. GRB on 20030101 seen by SPI-ACS
  68. IPN triangulation of GRB030101 (two large error boxes)
  69. GRB021226
  70. GRB 021211: Probable Host and Underlying Supernova
  71. GRB 021226 registration by Helicon/Coronas-F
  72. Probable GRB in INTEGRAL SPI-ACS
  73. IPN triangulation of GRB021223 (two large error boxes)
  74. GRB021211, radio observations
  75. GRB 021112: Evidence for Another Dark Optical Afterglow
  76. GRB 021219: OSN optical observations
  77. GRB021219: Radio Observations
  78. IPN triangulation of GRB021219 - CORRECTION
  79. IPN triangulation of GRB021219
  80. GRB021219, optical observation by MASTER
  81. GRB021219: Correction to GCN 1766
  82. VLT spectra of GRB 021211 revisited
  83. GRB021219: a long GRB localized by INTEGRAL
  84. IPN detection of continued activity from SGR1806-20
  85. IPN triangulation of GRB021215 (large error box)
  86. IPN triangulation of GRB021214 (annulus)
  87. XRF 020903 : HST observations
  88. GRB 021201: Optical Observations
  89. GRB 021211, optical observations
  90. GRB 021211: CTIO observations
  91. GRB021211: Measurement of Early Time Afterglow
  92. VLT spectrum of GRB 021211
  93. IPN triangulation of GRB021211B (two large error boxes)
  94. GRB 021211: early break in light curve
  95. GRB021211, BVRI field photometry
  96. GRB 021211, IR observations
  97. GRB 021211, optical observations
  98. GRB 021211: Optical Observations
  99. GRB021211: Kiso Observations
  100. GRB021204: Kiso Observations

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