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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').

5468 results found.

  1. GRB010220, Radio and Optical Observations
  2. GRB010214 Optical Observation
  3. GRB 001204: Ks observations
  4. GRB 001212 Optical Observation
  5. GRB 001212 possible OA in 2MASS
  6. GRB 001212 possible OA
  7. GRB 001105, further optical observations
  8. GRB001120, optical observations
  9. Optical/NIR observations of GRB001109
  10. GRB 001109: deep JHK upper limits
  11. GRB 001105, R-band observation
  12. V,R,I band observations of GRB000926
  13. The Likely Optical/Infrared Afterglow of GRB 001011
  14. GRB000911, Radio and Optical observations
  15. SGR 1806-20 burst activity
  16. GRB000630: Optical observations
  17. GRB000615, R-band photometry
  18. GRB 000418: Detection of the Host Galaxy
  19. X-ray Afterglow of GRB 000529
  20. GRB 000528 Optical Observations
  21. BATSE observations of FXT/GRB 000416 = 1SAXJ1715.0-7134
  22. GRB000301C, Radio observations
  23. GRB000301C, Radio observations
  24. GRB 000210: BATSE Observations
  25. BATSE GRB trigger criteria changed
  26. BATSE Observations of GRB000115
  27. GRB 991216: Updated BATSE parameters
  28. IR observations of GRB991216
  29. GRB 991216 Radio Observations
  30. GRB 991208 SAO-RAS Spectroscopy
  31. GRB 991208 Keck Spectroscopy
  32. GRB 991216: Extremely bright BATSE burst
  33. GRB991208, optical observations
  34. GRB991106: BeppoSAX/BATSE results
  35. BeppoSAX NFI Observation of GRB991106
  36. GRB 991105: BATSE Observations
  37. GRB 991106 Optical Observations
  38. GRB991014 BATSE Observations
  39. BATSE GRB trigger criteria
  40. GRB990806: BATSE Observations
  41. Late-time HST/STIS Observations of GRB 990510
  42. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  43. GRB 990510: BATSE Observations
  44. GRB 990510 Optical Observations
  45. GRB 990506: BATSE Observations
  46. GRB 990506, Optical Observations
  47. GRB 990506 optical observations
  48. GRB 990506 optical observations
  49. GRB 990316 optical observations
  50. GRB990123, 15-GHz limits
  51. GRB 990123: BATSE Observations
  52. GRB 990123 Optical Follow-up
  53. GRB981220, Optical Observations
  54. GRB 981220:Optical Observations
  55. GRB 981226 - Infrared Observations
  56. GRB 980326/Host Galaxy
  57. GRB 980923 BATSE Observations
  58. GRB980703, Host galaxy multicolor photometry
  59. GRB 980703: BATSE Observations
  60. GRB 980613: BATSE Observations
  61. SGR1900+14
  62. SGR1900+14
  63. GRB980519 BATSE Observations
  64. BATSE on-board GRB trigger change
  65. GRB980425 BATSE observations
  66. GRB980329
  67. GRB 971214: KPNO Optical Observations
  68. GRB 970228: Keck/LRIS Optical Observations

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