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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"

32552 results found.

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

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