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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"

28099 results found.

  1. GRB041211: Ashra Prototype optical observation
  2. GRB041211, BVRcIc field calibration
  3. GRB041211,optical observation
  4. GRB 041211: Infrared Observations
  5. GRB 041211: KAIT observations
  6. GRB 041211: Optical follow-up in East Asian region
  7. Triangulation of short GRB 041116 (large error box)
  8. GRB 040924: Afterglow Color
  9. GRB 041006: GETS Optical Afterglow Observation
  10. Summary of the recent bursts from SGR 1806-20
  11. GRB 041006: Optical Observations
  12. GRB041006, late-time optical photometry
  13. GRB041006: RTT150 Optical Observations
  14. HST Observations: XRF 040701 and 040812
  15. Bright bursts from SGR1806-20
  16. GRB 041016: BOOTES-2 simultaneous observation
  17. GRB041006: RTT150 Optical Observations
  18. GRB041016,optical observation
  19. GRB 041016: Optical limits
  20. GRB 041016:Optical limit during first minute
  21. GRB 041015: Optical Observations at Rikubetsu
  22. GRB 041016: Optical limit
  23. GRB 041015 R band observations
  24. GRB040924, BVRcIc field calibration
  25. GRB041015,optical observation
  26. GRB041006: Fading X-ray Afterglow Observed with Chandra
  27. GRB 041015 - A long GRB detected by INTEGRAL
  28. GRB041006: VLT observations of the afterglow and host galaxy
  29. GRB041006: Optical observations and Potential host galaxy
  30. GRB041006, BVRcIc field calibration
  31. GRB 040924: VLT spectroscopy
  32. GRB 041006: SARA afterglow observations
  33. GRB041006, optical observation in CrAO
  34. Search for SN light in XRF 040912 with MEGACAM
  35. GRB 041006: BR observations with VATT
  36. GRB 041006: Redshift confirmed
  37. GRB 041006: Radio Observations
  38. GRB 041006 : optical follow-up observation at Lulin Observatory
  39. GRB041006: Optical photometry and spectroscopy at TNG
  40. GRB 041006: presice astrometry
  41. GRB041006, optical I observation
  42. GRB041006 (=HETE3570): optical observations
  43. ROTSE-IIIa Observations of GRB 041006
  44. GRB041006: MASTER optical observations
  45. GRB041006,optical observation
  46. Konus-Wind observation of a series SGR 1806-20 bursts on 041005
  47. GRB041006: Fading of optical afterglow candidate
  48. GRB 041006: Optical afterglow candidate
  49. Bursts from SGR 1806-20: Preliminary INTEGRAL results
  50. XRF 020903: Observations of the Host Galaxy
  51. radio observations, GRB 040924
  52. GRB040929,optical observation
  53. GRB040924,optical observation
  54. GRB040924,optical observation
  55. GRB 040924: detection of possible host galaxy by Subaru
  56. GRB040924: KAIT observations
  57. GRB040924 : Optical candidate observations at Lulin observatory
  58. GRB040924 : Optical candidate observations at Lulin observatory
  59. GRB 040924: Subaru NIR observation
  60. XRF 040912: Radio Observations
  61. XRF 040916: Radio Observations
  62. GRB040912(=H3557): Chandra Candidate X-ray Afterglow
  63. XRF040916: continuing decay of OT
  64. TAROT Observations of GRB 040916 (HETE #3558)
  65. GRB040912(=H3557): Candidate Optical Afterglow
  66. XRF040916, optical observations
  67. XRF 040912, identification of CXO sources
  68. XRF040912, BVRcIc field calibration
  69. XRF040916, BVRcIc field calibration
  70. GRB040916: Archival optical observations
  71. GRB040912(=H3557): Observations with the Chandra X-ray Observatory
  72. GRB040916: Optical observations
  73. GRB040912 (= H3557): Chandra Observations Scheduled
  74. GRB 040912: Optical Observations
  75. GRB/XRF040912,optical observations
  76. GRB 040912, BVRI observations
  77. Optical observations of field of GRB040912
  78. HETE 3557: Optical observations
  79. GRB040903 - A XRF?
  80. GRB040827: analysis of the XMM-Newton observation
  81. GRB040903, REM near-IR observation
  82. Very bright burst detected from SGR 1806-20
  83. ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)
  84. Possible GRB 040903 - further analysis
  85. GRB 040827 - Radio Observations
  86. XMM-Newton Images of GRB 040827
  87. GRB 040827: optical and NIR observations at the VLT
  88. GRB 040827: UKIRT - 2nd epoch K-band imaging
  89. GRB 040827: 2nd epoch of Magellan K-band imaging
  90. GRB 040827: K imaging - no evidence of variability
  91. GRB 040827: Detection of NIR afterglow
  92. GRB040827 XMM-Newton observation
  93. GRB040825A: optical limit before GRB
  94. GRB 040825B: Optical observations
  95. GRB 040827 : Planned XMM-Newton observation
  96. GRB040825B, BVRcIc field photometry
  97. GRB040825A, BVRcIc field photometry
  98. GCN GRB OBSERBATION REPORT
  99. GRB 040825A,optical observations
  100. GRB040825A: optical observations

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