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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"

21267 results found.

  1. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  2. IPN triangulation of GRB030605B (annulus)
  3. GRB 030528: tentative NIR counterpart
  4. GRB 030528, radio observations
  5. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  6. GRB030329, further radio observations at GMRT
  7. GRB030528, BVRI field photometry
  8. GRB030329, SPM optical observations
  9. GRB030528(=H2724): Revised SXC Localization
  10. GRB 030528 Bisei optical observation
  11. GRB030528 (H2724): A long GRB localized by HETE
  12. GRB 030528 (=H2724) Kyoto optical observation
  13. GRB030329, Optical observations
  14. GRB 030329: HST ACS Observations of the Host
  15. GRB 030329 Optical Observations
  16. GRB030329: XMM-Newton observation
  17. GRB 021004: HST observations
  18. GRB030324: Further Observations of the Candidate Optical Afterglow
  19. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  20. GRB 030418: Second Epoch Optical Observations with Magellan
  21. HETE GRB030329, correction to Rc Observations in Loiano
  22. GRB 030329: Optical limit (contemporaneous imaging)
  23. IPN triangulation of GRB030509 (small errror box)
  24. IPN triangulation of GRB030509 - correction
  25. IPN triangulation of GRB030509 (single error box)
  26. GRB030329: RTT150 optical observations
  27. GRB030329, BVRI photometry
  28. GRB030429, refiend optical brightness
  29. GRB030418, BVRcIc field photometry
  30. GRB 030429: Redshift of neighbor galaxy
  31. GRB030429, BVRcIc field photometry
  32. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  33. GRB030429: RTT150 optical observations, a possible host galaxy
  34. GRB030329: RTT150 optical observations and upper limit for a host
  35. GRB030329: RTT150 optical observations and upper limit for a host
  36. GRB 030429: redshift from VLT spectroscopy
  37. GRB030501: TAROT candidate afterglow present in archival images
  38. GRB 030429: confirmation of afterglow candidate
  39. GRB030425: CrAO optical observation
  40. IPN triangulation of GRB030429 (annulus)
  41. GRB 030329 Oprical observations in Rozhen observatory
  42. GRB 030429: ROTSE-III observations
  43. GRB030329, SPM optical observations
  44. GRB 030329, the review of the sky area in plate archive (1950-1998)
  45. GRB 030329: optical spectropolarimetry at VLT
  46. IPN triangulation of GRB030422C (annulus)
  47. GRB 030329: wide-field photograph by R. Tamura 1 hr after the burst
  48. GRB030329: optical polarization
  49. IPN triangulation of GRB030422 (two large error boxes)
  50. MASTER:optical observations GRB030418
  51. MASTER:optical observations probable GRB030414
  52. ROTSE-III prompt optical detections of GRB 030418
  53. GRB030418: Kiso near infrared observations
  54. OT GRB 030329: early spectrum
  55. GRB030324: Candidate Optical Afterglow
  56. IPN triangulation of GRB030413 (small error box)
  57. GRB030329, optical position
  58. IPN triangulation of GRB030406 (small error box)
  59. IPN triangulation of GRB050403 (small error box)
  60. GRB030329: HET spectroscopic monitoring
  61. Kiso observation of the GRB030329 at April 6
  62. GRB030328, UBVRcIc field photometry
  63. GRB 030329 Optical observations
  64. GRB 030329, color evolution
  65. GRB 030329: possible color change
  66. GRB030329: Kiso B and R band observations
  67. SDSS 0.5m PT observations of GRB030329 (correction)
  68. SDSS 0.5m PT observations of GRB030329
  69. GRB030329: final R-band light curve by MASTER
  70. GRB 030329: Sub-millimeter detection
  71. GRB030329, new UBVRcIc field photometry
  72. GRB030328: Full Observation, X-ray Fading and Spectrum Measured
  73. GRB030329: Optical observations at Teramo
  74. GRB 030329: Radio observations at GMRT
  75. GRB 030329: Additional Mt. Laguna Optical Observations
  76. GRB 030329: Observations with ANDICAM
  77. GRB 030329: fitting parameters and re-brightening
  78. triangulation of GRB 030331 (single error box)
  79. AAVSO V & R observations of GRB030329
  80. GRB 030329: optical observations
  81. GRB 030324: Optical and NIR Observations
  82. GRB030329: R band light curve by MASTER
  83. GRB030329 - Light curve flattening
  84. GRB 030324, optical search
  85. GRB 030329, optical observations
  86. GRB030328: X-ray Fading and Spectrum Measured with Chandra
  87. GRB030329a: detection by Konus-Wind
  88. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  89. GRB 030329: Light curve observed during the change of its slope.
  90. GRB030329, BVRcIc field photometry
  91. GRB030329, SPM optical observations
  92. GRB030329 optical observations
  93. GRB 030329: Optical pre-Imaging
  94. GRB 030329: Upper limit from 5.6 hours before trigger
  95. GRB030328: X-ray Afterglow Observed with Chandra
  96. GRB 030329, R-band observations
  97. GRB030329: Upper limits from recent and historical observations.
  98. GRB 030329: Optical Afterglow Observations
  99. GRB 030328: optical observations
  100. GRB 030329: Optical afterglow fading

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