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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

44419 results found.

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

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