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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"

35994 results found.

  1. IPN triangulation of GRB030216 (annulus)
  2. IPN triangulation of GRB030215A and GRB030215B (annuli)
  3. GRB030115, WSRT radio observations - correction to GCN 1864
  4. GRB 030131: marginal optical detection
  5. GRB030115, WSRT radio observations
  6. IPN triangulation of GRB030206 (annulus)
  7. IPN triangulation of GRB030208 (annulus)
  8. GRB 030204: Optical Observations
  9. GRB030204 field photometry
  10. GRB020819: Kiso R and I band observations
  11. GRB 030204: Correction to GCN 1856
  12. GRB 030115: Optical Observations
  13. GRB 030204, optical observations
  14. IPN triangulation of GRB030204 (small error box)
  15. IPN triangulation of GRB030202 (annulus)
  16. GRB 030131, optical observations
  17. GRB030131: Kiso optical limit for corrected position
  18. GRB030131: Optical limits for corrected position
  19. GRB 030131: afterglow candidate
  20. GRB 030115, late-time optical observations
  21. GRB030131: corrected INTEGRAL position
  22. Type Ic SN2003L (SN/GRB?), optical spectrum
  23. GRB030131: Kiso Observations
  24. GRB 020819: Host galaxy at Radio Position
  25. IPN triangulation of GRB030131 - CORRECTION
  26. GRB 020819: afterglow candidate
  27. IPN triangulation of GRB030131
  28. GRB 030131 optical observations
  29. GRB 030131 optical observations
  30. A long GRB detected by INTEGRAL
  31. GRB030115: 1.2 mm upper limits with MAMBO @ IRAM 30m
  32. Type Ic SN2003L (SN/GRB?) Radio Observations
  33. IPN triangulation of GRB030127 (annulus)
  34. GRB030115 submm upper limit
  35. IPN triangulation of GRB030119 (two large error boxes)
  36. GRB 030115: Further IR observations with IRSF/SIRIUS
  37. IPN triangulation of GRB030117 (two large error boxes)
  38. Publicizing GRB Discoveries - A Message from NASA HQ
  39. GRB 030115: Radio detection of IR candidate
  40. GRB 030115, simultaneous observations by BOOTES-1
  41. GRB 030115: IR observations with IRSF/SIRIUS
  42. IPN triangulation of GRB030115C (large error box)
  43. GRB030115: R-band counterpart of IR candidate
  44. GRB030115, afterglow candidate
  45. GRB 021211: R-band observations at late-time
  46. GRB030115: Optical Observations, Swiss Telescope at La Silla (ESO, Chile)
  47. IPN triangulation of GRB030115B (small error box)
  48. GRB 030115 : Possible IR counterpart
  49. GRB 030115: Radio Observations
  50. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  51. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  52. IPN triangulation of GRB030115B (annulus)
  53. ANNOUNCEMENT ON INTEGRAL GRB ALERTS
  54. Distribution of INTEGRAL SPI-ACS triggers
  55. GRB030115: R-band observations at Asiago
  56. GRB030115: TAROT optical observations
  57. GRB 021211: VLT spectrum
  58. GRB 030115: APO Optical Observations
  59. GRB 030115, no optical candidate
  60. GRB 030115, optical observations
  61. GRB 030115, optical candidate
  62. Possible GRB030113 seen by SPI ACS
  63. Probable GRB030112B seen by SPI ACS
  64. Probable GRB030112 seen by SPI ACS
  65. Possible GRB030111 seen by SPI ACS
  66. Possible GRB030110b seen by SPI ACS
  67. Possible GRB 030110 seen by SPI ACS
  68. IPN triangulation of GRB030109 (annulus)
  69. IPN triangulation of GRB030105 (large error box)
  70. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  71. Possible GRB 20030109 seen by SPI ACS
  72. IPN triangulation of GRB030102B (portion of annulus)
  73. IPN triangulation of GRB030102A (large error box)
  74. Possible GRB20030107 seen by SPI-ACS
  75. Possible GRB 20030105 seen by SPI ACS
  76. IPN triangulation of GRB030102 (annulus)
  77. GRB on 20030102 seen by SPI-ACS
  78. VLT spectroscopy of the probable host of GRB 021211
  79. GRB on 20030101 seen by SPI-ACS
  80. IPN triangulation of GRB030101 (two large error boxes)
  81. GRB021226
  82. GRB 021211: Probable Host and Underlying Supernova
  83. GRB 021226 registration by Helicon/Coronas-F
  84. Probable GRB in INTEGRAL SPI-ACS
  85. IPN triangulation of GRB021223 (two large error boxes)
  86. GRB021211, radio observations
  87. GRB 021112: Evidence for Another Dark Optical Afterglow
  88. GRB 021219: OSN optical observations
  89. GRB021219: Radio Observations
  90. IPN triangulation of GRB021219 - CORRECTION
  91. IPN triangulation of GRB021219
  92. GRB021219, optical observation by MASTER
  93. GRB021219: Correction to GCN 1766
  94. VLT spectra of GRB 021211 revisited
  95. GRB021219: a long GRB localized by INTEGRAL
  96. IPN detection of continued activity from SGR1806-20
  97. IPN triangulation of GRB021215 (large error box)
  98. IPN triangulation of GRB021214 (annulus)
  99. XRF 020903 : HST observations
  100. GRB 021201: Optical Observations

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