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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"

32560 results found.

  1. IPN triangulation of GRB030626 (single large error box)
  2. GRB030418: R optical observations
  3. Final IPN error ellipse for GRB021206 (the polarized GRB)
  4. GRB 021206, Radio afterglow candidate
  5. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  6. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  7. GRB 030528: Optical Observations
  8. GRB 030528: tentative NIR counterpart
  9. GRB 030528, radio observations
  10. GRB030329, further radio observations at GMRT
  11. GRB030528, BVRI field photometry
  12. GRB030329, SPM optical observations
  13. GRB030528: Chandra TOO Planned
  14. GRB 030519B: optical observations.
  15. GRB 030329: optical observations
  16. GRB 030329/SN 2003dh: Jitter Episode
  17. GRB 030528, Teramo optical observation
  18. GRB 030528 Bisei optical observation
  19. GRB030528 (H2724): A long GRB localized by HETE
  20. GRB 030329: Correction to GCN 2254
  21. GRB 030329: Optical Observations
  22. GRB 030416: Optical Observations
  23. GRB030329, Optical observations
  24. GRB 030329/SN 2003dh: Possible increase in brightness
  25. GRB 030329: HST ACS Observations of the Host
  26. GRB 030329 Optical Observations
  27. GRB030329: XMM-Newton observation
  28. GRB030324: Further Observations of the Candidate Optical Afterglow
  29. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  30. IPN triangulation of GRB030519B=H2716 (small error box)
  31. GRB 030418: Second Epoch Optical Observations with Magellan
  32. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  33. HETE GRB030329, correction to Rc Observations in Loiano
  34. GRB 030329: Optical limit (contemporaneous imaging)
  35. GRB 030501: final TAROT limits
  36. IPN triangulation of GRB030509 (small errror box)
  37. IPN triangulation of GRB030509 - correction
  38. GRB030329: RTT150 optical observations
  39. GRB030329, BVRI photometry
  40. GRB030429, refiend optical brightness
  41. GRB 030329: Optical limit (contemporaneous photography)
  42. GRB030418, BVRcIc field photometry
  43. GRB 030429: Redshift of neighbor galaxy
  44. GRB030429, BVRcIc field photometry
  45. GRB030429: RTT150 optical obs., correction to GCN 2208
  46. GRB 030329: High-Resolution Spectroscopy of the Host
  47. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  48. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  49. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  50. GRB030429: RTT150 optical observations, a possible host galaxy
  51. GRB030329: RTT150 optical observations and upper limit for a host
  52. GRB030501, optical observation
  53. GRB030501 observation report
  54. GRB030501 triangulation (correction to GCN 2194)
  55. GRB030329: RTT150 optical observations and upper limit for a host
  56. GRB 030429: Radio Observations
  57. GRB 030429: redshift from VLT spectroscopy
  58. GRB 030429: IR photometry with IRSF/SIRIUS
  59. GRB030501B triangulation (single error box)
  60. GRB 030329 Optical Observations
  61. GRB030328, optical observation
  62. GRB 030329, BVRI photometry
  63. GRB030429: Optical Observations
  64. GRB030501: TAROT candidate afterglow present in archival images
  65. GRB 030501: TAROT possible candidate counterpart
  66. IPN triangulation of GRB030501 (IBIS event; annulus)
  67. GRB 030429: confirmation of afterglow candidate
  68. GRB030425: CrAO optical observation
  69. GRB 030329 Oprical observations in Rozhen observatory
  70. GRB 030324: Radio Observations
  71. GRB030329 observed as a sudden ionospheric disturbance (SID)
  72. GRB030329, SPM optical observations
  73. GRB 030329, the review of the sky area in plate archive (1950-1998)
  74. GRB 030329: Spectral Evolution of SN 2003dh
  75. GRB 030329: optical spectropolarimetry at VLT
  76. GRB030329: optical polarization
  77. GRB030329, optical observation
  78. GRB030329: 444 AAVSO Measurements
  79. ROTSE-III prompt optical detections of GRB 030418
  80. GRB030418: Upper limits from recent and historical observations.
  81. GRB 030418: Optical afterglow
  82. GRB 030418: Finder for afterglow candidate
  83. GRB 030329 OT position
  84. GRB030329: Optical Observations
  85. OT GRB 030329: early UBVRcIc spectral evolution
  86. GRB030329, UBVRI polarimetry, R-polarization
  87. GRB 030329: SARA Optical Observations
  88. OT GRB 030329: early spectrum
  89. GRB030329: VR Photometry at TNG
  90. GRB030324: Candidate Optical Afterglow
  91. GRB 030413: Optical Observations
  92. GRB 030329 Rc observations
  93. Superluminal motion in GRB 030329 (Correction)
  94. Superluminal motion in GRB 030329
  95. GRB 030329 and SN 2003dh
  96. GRB030329, optical position
  97. GRB 030329 VLBA Observations
  98. GRB 030329: BVRI photometry at Asiago
  99. GRB 030329, light curve flattens
  100. GRB 030329: VLT V-band photometry

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