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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"

17851 results found.

  1. GRB030115 (=H2533): A Long GRB Localized by the HETE WXM and SXC
  2. Distribution of INTEGRAL SPI-ACS triggers for GRB bursts
  3. GRB 030115: APO Optical Observations
  4. VLT spectroscopy of the probable host of GRB 021211
  5. GRB 021211: Probable Host and Underlying Supernova
  6. GRB 021112: Evidence for Another Dark Optical Afterglow
  7. GRB 021219: OSN optical observations
  8. GRB021219, optical observations
  9. GRB021219, optical observation by MASTER
  10. GRB021219: a long GRB localized by INTEGRAL
  11. GRB021211: APO optical observations
  12. XRF 020903 : HST observations
  13. GRB 021201: Optical Observations
  14. GRB 021211: CTIO observations
  15. GRB021211, BVRI field photometry
  16. GRB021211: Optical observations in CrAO
  17. GRB 021211, optical observations
  18. GRB021211: Kiso Observations
  19. GRB 021201, optical observations
  20. GRB021211: Optical observations
  21. GRB 021201 (short/hard), NOT observations
  22. Chandra observation of the IPN error box of GRB021201 (short/hard)
  23. GRB 021211, R- and I-band observations
  24. GRB021211 - Upper limits from recent and historical observations
  25. IPN triangulation of GRB021206 (small error box)
  26. GRB021201, BVRcIc field photometry
  27. GRB 021201: BOOTES simultaneous optical observations
  28. IPN triangulation of GRB021201 (short/hard burst, small error box)
  29. GRB021004, late time optical observations
  30. IPN BURST POSITION
  31. IPN triangulation of GRB021125 (INTEGRAL BURST)
  32. GRB021125 : A long GRB localized by INTEGRAL
  33. GRB 021112: Afterglow or Variable Star?
  34. GRB021113: optical observations at Bisei
  35. GRB 021113: Evidence for a Dark Optical Afterglow
  36. GRB021112, BVRI field photometry
  37. GRB 021112: Variable Source in R-band search
  38. GRB021112: Optical Observations
  39. GRB 021113: Optical observations
  40. GRB 021112: RAPTOR Observations
  41. GRB 021113: Optical Observations
  42. GRB 021016: Optical Observations
  43. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  44. GRB021104: optical observations
  45. Detection of activity from SGR 1900+14 with the RXTE/PCA
  46. GRB 021004: VRI observations at TNG: possible break
  47. IPN triangulation of GRB021014 (large error box)
  48. IPN triangulation of GRB021013 (two small error boxes)
  49. XRF 020903: flattening of the optical light curve.
  50. GRB021004, UBVRcIc field photometry update
  51. GRB 021004: Optical/NIR Observations
  52. GRB 021004: Additional V-band Polarimetric Observations
  53. GRB021004: optical observation
  54. GRB 021004: Host Galaxy Star Formation Rate
  55. GRB 021004: WC wind?
  56. IPN triangulation of GRB021007 (annulus)
  57. GRB021004: BVRc photometry
  58. GRB021004 radio observation
  59. GRB 021004: Optical Photometry at 2.5 Days
  60. GRB 021004: polarimetric observations
  61. GRB 021004: V-band Polarimetric Observations
  62. GRB021004: Update Bisei photometric data
  63. GRB 021004 radio observation
  64. GRB 021004: Optical Photometry at 1.5 Days
  65. GRB021004, BVRcIc field photometry
  66. GRB 021004 radio search
  67. XRF020903, BVRI field photometry
  68. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  69. XRF020903: TNG and Asiago photometry
  70. XRF 020903: Correction to GCN 1560
  71. XRF 020903: VRI observations
  72. XRF 020903: R band observations
  73. IPN triangulation of GRB020923 (two error boxes)
  74. GRB 020305: HST/STIS observations
  75. XRF 020903: optical observation at Kyoto
  76. GRB020322 : HST/STIS observations
  77. XRF 020903: Optical observations
  78. IPN triangulation of GRB020904
  79. INTEGRAL GRBs added to GCN
  80. GRB020812: negative optical observations
  81. GRB 020812: optical observation at Kyoto University
  82. Second epoch K band imaging of GRB 020819
  83. GRB 020813 : HST observations
  84. GRB 020812: early time optical observation at Ouda Station
  85. GRB020813: Magellan BVRI Photometry
  86. GRB 020819: Optical observations
  87. K band observation of GRB 020819
  88. GRB020813: optical and NIR observations
  89. GRB020813: Fading X-ray Afterglow Observed with Chandra
  90. GRB020813, UBVRI field calibration
  91. Polarimetry of GRB020813: evidence for variability
  92. GRB020812: optical observations
  93. GRB020813: High-Resolution Optical Observations
  94. GRB020813: Early Time Magnitude
  95. GRB020812: optical observations
  96. GRB020813, optical observations
  97. GRB020813, astrometric position
  98. GRB 020812 optical observation
  99. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  100. GRB020801: Imaging of Suggested OT Counterpart at the Magellan

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